如何在 Qt 中制作 expandable/collapsable 部分小部件
How to make an expandable/collapsable section widget in Qt
我想在 Qt 中创建一个具有以下功能的自定义小部件：
- 是容器
- 它可以填充任何 Qt 布局
- 它可以在任何 Qt 布局中
- 按钮允许collapse/fold垂直显示内容，因此只有按钮可见，所有包含的布局都是不可见的。
- 上一个按钮允许 expand/unfold 再次调整为布局内容的大小。
- expanding/collapsing 基于大小（而不是 show/hide）允许动画。
- 可在 QDesigner 中使用
为了提供一个想法，这是一个类似的小部件（不是 Qt）的图像：
我已经有一个可以正常工作并在 QDesigner 中公开的框架。我现在需要达到 extend/collapse，这似乎并不那么简单。
我尝试使用 resize()、sizePolicy()、sizeHint()，但它们不起作用：
当框架折叠时，我得到以下值：
sizeHint: (500,20)
size : (500,20)
closestAcceptableSize: (518,150)
Painted size: (518, 150)
QLayout::closestAcceptableSize 不是小部件的一部分，因此我无法更改它。
有任何提示 or/and 代码片段可以实现吗？
已编辑：
这里有一个简单的例子。除必要外，我删除了所有内容。
main.cpp 例子
#include <QWidget>
#include <QPushButton>
#include <QVBoxLayout>
#include "section.hpp"
using namespace myWidgets;
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
// Create the main Window
QWidget window;
window.resize(500,500);
window.setStyleSheet("QPushButton:{background-color:rgba(128,128,128,192);}");
// Create the main window layout
QVBoxLayout topLayout(&window);
QWidget *w1 = new QWidget();
w1->setStyleSheet("background-color:rgba(128,128,128,192);");
topLayout.addWidget(w1);
Section section(&window);
topLayout.addWidget(§ion);
QVBoxLayout inLayout(§ion);
QPushButton *button = new QPushButton();
button->setMinimumHeight(100);
inLayout.addWidget(button);
QWidget *w2 = new QWidget();
w2->setStyleSheet("background-color:rgba(128,128,128,192);");
topLayout.addWidget(w2);
window.show();
return a.exec();
}
Section.hpp
#ifndef SECTION_HPP
#define SECTION_HPP
#include <QPushButton> //for the expand/collapse button
#include <QtDesigner/QDesignerExportWidget>
#include <QLayout>
#include <QPainter>
#include <QPaintEvent>
#include <QDebug>
// Compatibility for noexcept, not supported in vsc++
#ifdef _MSC_VER
#define noexcept throw()
#endif
#if defined SECTION_BUILD
#define SECTION_BUILD_DLL_SPEC Q_DECL_EXPORT
#elif defined SECTION_EXEC
#define SECTION_BUILD_DLL_SPEC
#else
#define SECTION_BUILD_DLL_SPEC Q_DECL_IMPORT
#endif
namespace myWidgets
{
class SECTION_BUILD_DLL_SPEC Section : public QWidget
{
Q_OBJECT
Q_PROPERTY( bool is_expanded MEMBER isExpanded)
public:
// Constructor, standard
explicit Section( QWidget *parent=0 ): QWidget(parent),
expandButton(this)
{
expandButton.resize(20,20);
expandButton.move(0,0);
expandButton.connect(&expandButton, &QPushButton::clicked,
this, &Section::expandCollapseEvent);
QMargins m= contentsMargins();
m.setTop(m.top()+25);
setContentsMargins(m);
//setSizePolicy(sizePolicy().horizontalPolicy(), QSizePolicy::Minimum);
}
virtual void expand( bool expanding ) noexcept
{
resize(sizeHint());
isExpanded = expanding;
updateGeometry();
qDebug() << (isExpanded? "expanded":"collapsed") << sizeHint() << QWidget::size() <<
parentWidget()->layout()->closestAcceptableSize(this, size());
}
virtual QSize sizeHint() const noexcept override
{
if (isExpanded) return QSize(layout()->contentsRect().width(),
layout()->contentsRect().height());
else return QSize(layout()->contentsRect().width(), 20);
}
// Implement custom appearance
virtual void paintEvent(QPaintEvent *e) noexcept override
{
(void) e; //TODO: remove
QPainter p(this);
p.setClipRect(e->rect());
p.setRenderHint(QPainter::Antialiasing );
p.fillRect(e->rect(), QColor(0,0,255,128));
}
protected:
// on click of the expandButton, collapse/expand this widget
virtual void expandCollapseEvent() noexcept
{
expand(!isExpanded);
}
bool isExpanded = true; //whenever the section is collapsed(false) or expanded(true)
QPushButton expandButton; //the expanding/collapsing button
};
}
#endif // SECTION_HPP
我采用的方案是利用widget的MaximumSize属性来限制折叠时的高度
最大的问题是了解折叠时展开的高度，以允许正确的动画步骤。这还没有解决，我目前制作了一个固定高度步长的动画（我将其设置为与 window 的预期高度相关的适当值）。
if (toBeFolded)
{
unfoldedMaxHeight = maximumHeight();
previousUnfoldedHeight = height();
setMaximumHeight(25);
}
else
{
// animate maximumHeight from 25 up to where the height do not change
// A hint of the final maximumHeight is the previousUnfoldedHeight.
// After animation, set maximumHeight back to unfoldedMaxHeight.
}
我偶然发现了同样的问题，并通过将可折叠小部件实现为 QScrollArea 来解决它，其最大高度由 QPropertyAnimation 动画。
但是因为我不使用 QDesigner，所以我不能告诉你它是否在那里工作。
我还有一个问题：可折叠小部件不仅可以向底部方向扩展，还可以向顶部和底部扩展。如果位于其上方的小部件尚未达到其最小高度，这可能会导致它们缩小。但与我们必须自己构建这个东西的事实相比，这确实是一个细节......
Spoiler.h
#include <QFrame>
#include <QGridLayout>
#include <QParallelAnimationGroup>
#include <QScrollArea>
#include <QToolButton>
#include <QWidget>
class Spoiler : public QWidget {
Q_OBJECT
private:
QGridLayout mainLayout;
QToolButton toggleButton;
QFrame headerLine;
QParallelAnimationGroup toggleAnimation;
QScrollArea contentArea;
int animationDuration{300};
public:
explicit Spoiler(const QString & title = "", const int animationDuration = 300, QWidget *parent = 0);
void setContentLayout(QLayout & contentLayout);
};
Spoiler.cpp
#include <QPropertyAnimation>
#include "Spoiler.h"
Spoiler::Spoiler(const QString & title, const int animationDuration, QWidget *parent) : QWidget(parent), animationDuration(animationDuration) {
toggleButton.setStyleSheet("QToolButton { border: none; }");
toggleButton.setToolButtonStyle(Qt::ToolButtonTextBesideIcon);
toggleButton.setArrowType(Qt::ArrowType::RightArrow);
toggleButton.setText(title);
toggleButton.setCheckable(true);
toggleButton.setChecked(false);
headerLine.setFrameShape(QFrame::HLine);
headerLine.setFrameShadow(QFrame::Sunken);
headerLine.setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Maximum);
contentArea.setStyleSheet("QScrollArea { background-color: white; border: none; }");
contentArea.setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
// start out collapsed
contentArea.setMaximumHeight(0);
contentArea.setMinimumHeight(0);
// let the entire widget grow and shrink with its content
toggleAnimation.addAnimation(new QPropertyAnimation(this, "minimumHeight"));
toggleAnimation.addAnimation(new QPropertyAnimation(this, "maximumHeight"));
toggleAnimation.addAnimation(new QPropertyAnimation(&contentArea, "maximumHeight"));
// don't waste space
mainLayout.setVerticalSpacing(0);
mainLayout.setContentsMargins(0, 0, 0, 0);
int row = 0;
mainLayout.addWidget(&toggleButton, row, 0, 1, 1, Qt::AlignLeft);
mainLayout.addWidget(&headerLine, row++, 2, 1, 1);
mainLayout.addWidget(&contentArea, row, 0, 1, 3);
setLayout(&mainLayout);
QObject::connect(&toggleButton, &QToolButton::clicked, [this](const bool checked) {
toggleButton.setArrowType(checked ? Qt::ArrowType::DownArrow : Qt::ArrowType::RightArrow);
toggleAnimation.setDirection(checked ? QAbstractAnimation::Forward : QAbstractAnimation::Backward);
toggleAnimation.start();
});
}
void Spoiler::setContentLayout(QLayout & contentLayout) {
delete contentArea.layout();
contentArea.setLayout(&contentLayout);
const auto collapsedHeight = sizeHint().height() - contentArea.maximumHeight();
auto contentHeight = contentLayout.sizeHint().height();
for (int i = 0; i < toggleAnimation.animationCount() - 1; ++i) {
QPropertyAnimation * spoilerAnimation = static_cast<QPropertyAnimation *>(toggleAnimation.animationAt(i));
spoilerAnimation->setDuration(animationDuration);
spoilerAnimation->setStartValue(collapsedHeight);
spoilerAnimation->setEndValue(collapsedHeight + contentHeight);
}
QPropertyAnimation * contentAnimation = static_cast<QPropertyAnimation *>(toggleAnimation.animationAt(toggleAnimation.animationCount() - 1));
contentAnimation->setDuration(animationDuration);
contentAnimation->setStartValue(0);
contentAnimation->setEndValue(contentHeight);
}
使用方法：
…
auto * anyLayout = new QVBoxLayout();
anyLayout->addWidget(…);
…
Spoiler spoiler;
spoiler.setContentLayout(*anyLayout);
…
虽然这是旧的，但我发现这个帖子很有用。但是，我在 python 工作，所以我不得不转换 C++ 代码。
以防万一有人在寻找 python 版本的 x 平方解决方案。这是我的端口：
from PyQt4 import QtCore, QtGui
class Spoiler(QtGui.QWidget):
def __init__(self, parent=None, title='', animationDuration=300):
"""
References:
# Adapted from c++ version
"""
super(Spoiler, self).__init__(parent=parent)
self.animationDuration = animationDuration
self.toggleAnimation = QtCore.QParallelAnimationGroup()
self.contentArea = QtGui.QScrollArea()
self.headerLine = QtGui.QFrame()
self.toggleButton = QtGui.QToolButton()
self.mainLayout = QtGui.QGridLayout()
toggleButton = self.toggleButton
toggleButton.setStyleSheet("QToolButton { border: none; }")
toggleButton.setToolButtonStyle(QtCore.Qt.ToolButtonTextBesideIcon)
toggleButton.setArrowType(QtCore.Qt.RightArrow)
toggleButton.setText(str(title))
toggleButton.setCheckable(True)
toggleButton.setChecked(False)
headerLine = self.headerLine
headerLine.setFrameShape(QtGui.QFrame.HLine)
headerLine.setFrameShadow(QtGui.QFrame.Sunken)
headerLine.setSizePolicy(QtGui.QSizePolicy.Expanding, QtGui.QSizePolicy.Maximum)
self.contentArea.setStyleSheet("QScrollArea { background-color: white; border: none; }")
self.contentArea.setSizePolicy(QtGui.QSizePolicy.Expanding, QtGui.QSizePolicy.Fixed)
# start out collapsed
self.contentArea.setMaximumHeight(0)
self.contentArea.setMinimumHeight(0)
# let the entire widget grow and shrink with its content
toggleAnimation = self.toggleAnimation
toggleAnimation.addAnimation(QtCore.QPropertyAnimation(self, b"minimumHeight"))
toggleAnimation.addAnimation(QtCore.QPropertyAnimation(self, b"maximumHeight"))
toggleAnimation.addAnimation(QtCore.QPropertyAnimation(self.contentArea, b"maximumHeight"))
# don't waste space
mainLayout = self.mainLayout
mainLayout.setVerticalSpacing(0)
mainLayout.setContentsMargins(0, 0, 0, 0)
row = 0
mainLayout.addWidget(self.toggleButton, row, 0, 1, 1, QtCore.Qt.AlignLeft)
mainLayout.addWidget(self.headerLine, row, 2, 1, 1)
row += 1
mainLayout.addWidget(self.contentArea, row, 0, 1, 3)
self.setLayout(self.mainLayout)
def start_animation(checked):
arrow_type = QtCore.Qt.DownArrow if checked else QtCore.Qt.RightArrow
direction = QtCore.QAbstractAnimation.Forward if checked else QtCore.QAbstractAnimation.Backward
toggleButton.setArrowType(arrow_type)
self.toggleAnimation.setDirection(direction)
self.toggleAnimation.start()
self.toggleButton.clicked.connect(start_animation)
def setContentLayout(self, contentLayout):
# Not sure if this is equivalent to self.contentArea.destroy()
self.contentArea.destroy()
self.contentArea.setLayout(contentLayout)
collapsedHeight = self.sizeHint().height() - self.contentArea.maximumHeight()
contentHeight = contentLayout.sizeHint().height()
for i in range(self.toggleAnimation.animationCount()-1):
spoilerAnimation = self.toggleAnimation.animationAt(i)
spoilerAnimation.setDuration(self.animationDuration)
spoilerAnimation.setStartValue(collapsedHeight)
spoilerAnimation.setEndValue(collapsedHeight + contentHeight)
contentAnimation = self.toggleAnimation.animationAt(self.toggleAnimation.animationCount() - 1)
contentAnimation.setDuration(self.animationDuration)
contentAnimation.setStartValue(0)
contentAnimation.setEndValue(contentHeight)
我知道这不是回答问题的好方法，只是 link，但我认为这个博客 post 非常相关：
http://www.fancyaddress.com/blog/qt-2/create-something-like-the-widget-box-as-in-the-qt-designer/
它基于 QTreeWidget，并使用其已实现的展开/折叠功能。
它解释了如何将小部件添加到树形小部件项目，以及如何添加用于折叠/展开它们的按钮。
当然，所有功劳都归功于 post 作者。
我仔细研究了@LoPiTal 提供的优秀指针并将其转换为 PyQt5 (Python3)。我觉得很优雅。
如果有人正在寻找 PyQt 解决方案，这是我的代码：
import sys
from PyQt5.QtWidgets import (QPushButton, QDialog, QTreeWidget,
QTreeWidgetItem, QVBoxLayout,
QHBoxLayout, QFrame, QLabel,
QApplication)
class SectionExpandButton(QPushButton):
"""a QPushbutton that can expand or collapse its section
"""
def __init__(self, item, text = "", parent = None):
super().__init__(text, parent)
self.section = item
self.clicked.connect(self.on_clicked)
def on_clicked(self):
"""toggle expand/collapse of section by clicking
"""
if self.section.isExpanded():
self.section.setExpanded(False)
else:
self.section.setExpanded(True)
class CollapsibleDialog(QDialog):
"""a dialog to which collapsible sections can be added;
subclass and reimplement define_sections() to define sections and
add them as (title, widget) tuples to self.sections
"""
def __init__(self):
super().__init__()
self.tree = QTreeWidget()
self.tree.setHeaderHidden(True)
layout = QVBoxLayout()
layout.addWidget(self.tree)
self.setLayout(layout)
self.tree.setIndentation(0)
self.sections = []
self.define_sections()
self.add_sections()
def add_sections(self):
"""adds a collapsible sections for every
(title, widget) tuple in self.sections
"""
for (title, widget) in self.sections:
button1 = self.add_button(title)
section1 = self.add_widget(button1, widget)
button1.addChild(section1)
def define_sections(self):
"""reimplement this to define all your sections
and add them as (title, widget) tuples to self.sections
"""
widget = QFrame(self.tree)
layout = QHBoxLayout(widget)
layout.addWidget(QLabel("Bla"))
layout.addWidget(QLabel("Blubb"))
title = "Section 1"
self.sections.append((title, widget))
def add_button(self, title):
"""creates a QTreeWidgetItem containing a button
to expand or collapse its section
"""
item = QTreeWidgetItem()
self.tree.addTopLevelItem(item)
self.tree.setItemWidget(item, 0, SectionExpandButton(item, text = title))
return item
def add_widget(self, button, widget):
"""creates a QWidgetItem containing the widget,
as child of the button-QWidgetItem
"""
section = QTreeWidgetItem(button)
section.setDisabled(True)
self.tree.setItemWidget(section, 0, widget)
return section
if __name__ == "__main__":
app = QApplication(sys.argv)
window = CollapsibleDialog()
window.show()
sys.exit(app.exec_())
贡献一个使用 PySide2 的版本（python3 的官方 Qt5 绑定）
from PySide2 import QtCore, QtGui, QtWidgets
class Expander(QtWidgets.QWidget):
def __init__(self, parent=None, title='', animationDuration=300):
"""
References:
# Adapted from PyQt4 version
# Adapted from c++ version
"""
super(Expander, self).__init__(parent=parent)
self.animationDuration = animationDuration
self.toggleAnimation = QtCore.QParallelAnimationGroup()
self.contentArea = QtWidgets.QScrollArea()
self.headerLine = QtWidgets.QFrame()
self.toggleButton = QtWidgets.QToolButton()
self.mainLayout = QtWidgets.QGridLayout()
toggleButton = self.toggleButton
toggleButton.setStyleSheet("QToolButton { border: none; }")
toggleButton.setToolButtonStyle(QtCore.Qt.ToolButtonTextBesideIcon)
toggleButton.setArrowType(QtCore.Qt.RightArrow)
toggleButton.setText(str(title))
toggleButton.setCheckable(True)
toggleButton.setChecked(False)
headerLine = self.headerLine
headerLine.setFrameShape(QtWidgets.QFrame.HLine)
headerLine.setFrameShadow(QtWidgets.QFrame.Sunken)
headerLine.setSizePolicy(QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Maximum)
self.contentArea.setStyleSheet("QScrollArea { background-color: white; border: none; }")
self.contentArea.setSizePolicy(QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Fixed)
# start out collapsed
self.contentArea.setMaximumHeight(0)
self.contentArea.setMinimumHeight(0)
# let the entire widget grow and shrink with its content
toggleAnimation = self.toggleAnimation
toggleAnimation.addAnimation(QtCore.QPropertyAnimation(self, b"minimumHeight"))
toggleAnimation.addAnimation(QtCore.QPropertyAnimation(self, b"maximumHeight"))
toggleAnimation.addAnimation(QtCore.QPropertyAnimation(self.contentArea, b"maximumHeight"))
# don't waste space
mainLayout = self.mainLayout
mainLayout.setVerticalSpacing(0)
mainLayout.setContentsMargins(0, 0, 0, 0)
row = 0
mainLayout.addWidget(self.toggleButton, row, 0, 1, 1, QtCore.Qt.AlignLeft)
mainLayout.addWidget(self.headerLine, row, 2, 1, 1)
row += 1
mainLayout.addWidget(self.contentArea, row, 0, 1, 3)
self.setLayout(self.mainLayout)
def start_animation(checked):
arrow_type = QtCore.Qt.DownArrow if checked else QtCore.Qt.RightArrow
direction = QtCore.QAbstractAnimation.Forward if checked else QtCore.QAbstractAnimation.Backward
toggleButton.setArrowType(arrow_type)
self.toggleAnimation.setDirection(direction)
self.toggleAnimation.start()
self.toggleButton.clicked.connect(start_animation)
def setContentLayout(self, contentLayout):
# Not sure if this is equivalent to self.contentArea.destroy()
self.contentArea.destroy()
self.contentArea.setLayout(contentLayout)
collapsedHeight = self.sizeHint().height() - self.contentArea.maximumHeight()
contentHeight = contentLayout.sizeHint().height()
for i in range(self.toggleAnimation.animationCount()-1):
expandAnimation = self.toggleAnimation.animationAt(i)
expandAnimation.setDuration(self.animationDuration)
expandAnimation.setStartValue(collapsedHeight)
expandAnimation.setEndValue(collapsedHeight + contentHeight)
contentAnimation = self.toggleAnimation.animationAt(self.toggleAnimation.animationCount() - 1)
contentAnimation.setDuration(self.animationDuration)
contentAnimation.setStartValue(0)
contentAnimation.setEndValue(contentHeight)
我构建了 Python3/Qt5 样式示例来测试我正在编写的样式表 class。
我还修复了未考虑扩展按钮尺寸变化的尺寸计算问题。
为了和Qt保持一致，我也把方法改成了setLayout()
import sys
import inspect
import textwrap
from collections import OrderedDict, UserString
from PyQt5 import QtCore, QtGui
from PyQt5.QtCore import Qt
from PyQt5.QtGui import QIcon
from PyQt5.QtWidgets import *
class QStyleSheet(UserString):
"""
Represent stylesheets as dictionary key value pairs.
Update complex stylesheets easily modifying only the attributes you need
Allow for attribute inheritance or defaulting of stylesheets.
# TODO support [readOnly="true"] attribute-selectors
QTextEdit, QListView <-- you can have multiple classes.
QCheckBox::indicator <-- some psuedo classes have double colons
"""
def __init__(self, cls=None, name=None, psuedo=None, **styles):
"""
Arguments to the constructor allow you to default different properties of the CSS Class.
Any argument defined here will be global to this StyleSheet and cannot be overidden later.
:param cls: Default style prefix class to ``cls``
:param name: Default object name to ``name`` (hashtag) is not needed.
:param psuedo: Default psuedo class to ``psuedo``, example: ``:hover``
"""
self.cls_scope = cls
self.psuedo_scope = psuedo
self.name_scope = name
self._styles = OrderedDict() # we'll preserve the order of attributes given - python 3.6+
if styles:
self.setStylesDict(OrderedDict(styles))
def _ident(self, cls=None, name=None, psuedo=None):
# -- ensure value is of correct type ----------------------------------------
if cls is not None and not inspect.isclass(cls):
raise ValueError(f'cls must be None or a class object, got: {type(cls)}')
if name is not None and not isinstance(name, str):
raise ValueError(f'name must be None or a str, got: {type(name)}')
if psuedo is not None and not isinstance(psuedo, str):
raise ValueError(f'psuedo must be None or a str, got: {type(psuedo)}')
# -- ensure not overiding defaults -------------------------------------------
if cls is not None and self.cls_scope is not None:
raise ValueError(f'cls was set in __init__, you cannot override it')
if name is not None and self.name_scope is not None:
raise ValueError(f'name was set in __init__, you cannot override it')
if psuedo is not None and self.psuedo_scope is not None:
raise ValueError(f'psuedo was set in __init__, you cannot override it')
# -- apply defaults if set ---------------------------------------------------
if cls is None and self.cls_scope is not None:
cls = self.cls_scope
if name is None and self.name_scope is not None:
name = self.name_scope
if psuedo is None and self.psuedo_scope is not None:
psuedo = self.psuedo_scope
# return a tuple that can be used as a dictionary key.
ident = tuple([getattr(cls, '__name__', None), name or None, psuedo or None])
return ident
def _class_definition(self, ident):
"""Get the class definition string"""
cls, name, psuedo = ident
return '%s%s%s' % (cls or '', name or '', psuedo or '')
def _fix_underscores(self, styles):
return OrderedDict([(k.replace('_', '-'), v) for k,v in styles.items()])
def setStylesStr(self, styles):
"""
Parse styles from a string and set them on this object.
"""
raise NotImplementedError()
self._update()
def setStylesDict(self, styles, cls=None, name=None, psuedo=None):
"""
Set styles using a dictionary instead of keyword arguments
"""
styles = self._fix_underscores(styles)
if not isinstance(styles, dict):
raise ValueError(f'`styles` must be dict, got: {type(styles)}')
if not styles:
raise ValueError('`styles` cannot be empty')
ident = self._ident(cls, name, psuedo)
stored = self._styles.get(ident, OrderedDict())
stored.update(styles)
self._styles[ident] = stored
self._update()
def setStyles(self, cls=None, name=None, psuedo=None, **styles):
"""
Set or update styles according to the CSS Class definition provided by (cls, name, psuedo) using keyword-arguments.
Any css attribute with a hyphen ``-`` character should be changed to an underscore ``_`` when passed as a keyword argument.
Example::
Lets suppose we want to create the css class:
QFrame#BorderTest { background-color: white; margin:4px; border:1px solid #a5a5a5; border-radius: 10px;}
>>> stylesheet.setStyle(cls=QFrameBorderTest, background_color='white', margin='4px', border_radius='10px')
>>> print(stylesheet)
QFrame#BorderTest { background-color: white; margin:4px; border:1px solid #a5a5a5; border-radius: 10px;}
"""
styles = OrderedDict(styles)
self.setStylesDict(styles=styles, cls=cls, name=name, psuedo=psuedo)
def getStyles(self, cls=None, name=None, psuedo=None):
"""
Return the dictionary representations of styles for the CSS Class definition provided by (cls, name, psuedo)
:returns: styles dict (keys with hyphens)
"""
ident = self._ident(cls, name, psuedo)
return self._styles.get(ident)
def getClassIdents(self):
"""Get all class identifier tuples"""
return list(self._styles.keys())
def getClassDefinitions(self):
"""Get all css class definitions, but not the css attributes/body"""
return [self._class_definition(ident) for ident in self.getClassIdents()]
def validate(self):
"""
Validate all the styles and attributes on this class
"""
raise NotImplementedError()
def merge(self, stylesheet, overwrite=True):
"""
Merge another QStyleSheet with this QStyleSheet.
The QStyleSheet passed as an argument will be left un-modified.
:param overwrite: if set to True the matching class definitions will be overwritten
with attributes and values from ``stylesheet``.
Otherwise, the css attributes will be updated from ``stylesheet``
:type overwrite: QStyleSheet
"""
for ident in stylesheet.getClassIdents():
styles = stylesheet.getStyles(ident)
cls, name, psuedo = ident
self.setStylesDict(styles, cls=cls, name=name, psuedo=psuedo)
self._update()
def clear(self, cls=None, name=None, psuedo=None):
"""
Clear styles matching the Class definition
The style dictionary cleared will be returned
None will be returned if nothing was cleared.
"""
ident = self._ident(cls, name, psuedo)
return self._styles.pop(ident, None)
def _update(self):
"""Update the internal string representation"""
stylesheet = []
for ident, styles in self._styles.items():
if not styles:
continue
css_cls = self._class_definition(ident)
css_cls = css_cls + ' ' if css_cls else ''
styles_str = '\n'.join([f'{k}: {v};' for k, v in styles.items()])
styles_str = textwrap.indent(styles_str, ''.ljust(4))
stylesheet.append('%s{\n%s\n}' % (css_cls, styles_str))
self.data = '\n\n'.join(stylesheet)
class Expander(QWidget):
def __init__(self, parent=None, title=None, animationDuration=200):
super().__init__(parent=parent)
self.animationDuration = animationDuration
self.toggleAnimation = QtCore.QParallelAnimationGroup()
self.contentArea = QScrollArea()
self.headerLine = QFrame()
self.toggleButton = QToolButton()
self.mainLayout = QGridLayout()
toggleButton = self.toggleButton
self.toggleButtonQStyle = QStyleSheet(QToolButton, border='none')
toggleButton.setStyleSheet(str(self.toggleButtonQStyle))
toggleButton.setToolButtonStyle(QtCore.Qt.ToolButtonTextBesideIcon)
toggleButton.setArrowType(QtCore.Qt.RightArrow)
toggleButton.setText(title or '')
toggleButton.setCheckable(True)
toggleButton.setChecked(False)
toggleButton.setSizePolicy(QSizePolicy.Minimum, QSizePolicy.Minimum)
headerLine = self.headerLine
self.headerLineQStyle = QStyleSheet(QFrame)
headerLine.setFrameShape(QFrame.NoFrame) # see: https://doc.qt.io/archives/qt-4.8/qframe.html#Shape-enum
headerLine.setFrameShadow(QFrame.Plain) # see: https://doc.qt.io/archives/qt-4.8/qframe.html#Shape-enum
headerLine.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Maximum)
self.contentAreaQStyle = QStyleSheet(QScrollArea, border='none')
self.contentArea.setStyleSheet(str(self.contentAreaQStyle))
self.contentArea.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Fixed)
# start out collapsed
self.contentArea.setMaximumHeight(0)
self.contentArea.setMinimumHeight(0)
# let the entire widget grow and shrink with its content
toggleAnimation = self.toggleAnimation
toggleAnimation.addAnimation(QtCore.QPropertyAnimation(self, b"minimumHeight"))
toggleAnimation.addAnimation(QtCore.QPropertyAnimation(self, b"maximumHeight"))
toggleAnimation.addAnimation(QtCore.QPropertyAnimation(self.contentArea, b"maximumHeight"))
# don't waste space
mainLayout = self.mainLayout
mainLayout.setVerticalSpacing(0)
mainLayout.setContentsMargins(0, 0, 0, 0)
row = 0
mainLayout.addWidget(self.toggleButton, row, 0, 1, 1, QtCore.Qt.AlignLeft)
mainLayout.addWidget(self.headerLine, row, 2, 1, 1)
row += 1
mainLayout.addWidget(self.contentArea, row, 0, 1, 3)
super().setLayout(self.mainLayout)
def start_animation(checked):
arrow_type = QtCore.Qt.DownArrow if checked else QtCore.Qt.RightArrow
direction = QtCore.QAbstractAnimation.Forward if checked else QtCore.QAbstractAnimation.Backward
toggleButton.setArrowType(arrow_type)
self.toggleAnimation.setDirection(direction)
self.toggleAnimation.start()
self.toggleButton.clicked.connect(start_animation)
def setHeaderFrameStyles(self, styles):
self._setWidgetStyles(self.headerLine, self.headerLineQStyle, styles)
def setToggleButtonStyles(self, styles):
self._setWidgetStyles(self.toggleButton, self.toggleButtonQStyle, styles)
def setContentAreaStyles(self, styles):
self._setWidgetStyles(self.contentArea, self.contentAreaQStyle, styles)
def _setWidgetStyles(self, widget, qstylesheet, var):
if isinstance(var, QStyleSheet):
qstylesheet.merge(var)
widget.setStyleSheet(str(qstylesheet))
elif isinstance(var, dict):
qstylesheet.setStylesDict(var)
widget.setStyleSheet(str(qstylesheet))
elif isinstance(var, str):
widget.setStyleSheet(var)
else:
raise ValueError('invalid argument type: {type(var)}')
def setLayout(self, contentLayout):
"""
Set the layout container that you would like to expand/collapse.
This should be called after all styles are set.
"""
# Not sure if this is equivalent to self.contentArea.destroy()
self.contentArea.destroy()
self.contentArea.setLayout(contentLayout)
collapsedHeight = self.toggleButton.sizeHint().height()
contentHeight = contentLayout.sizeHint().height()
for i in range(self.toggleAnimation.animationCount()-1):
spoilerAnimation = self.toggleAnimation.animationAt(i)
spoilerAnimation.setDuration(self.animationDuration)
spoilerAnimation.setStartValue(collapsedHeight)
spoilerAnimation.setEndValue(collapsedHeight + contentHeight)
contentAnimation = self.toggleAnimation.animationAt(self.toggleAnimation.animationCount() - 1)
contentAnimation.setDuration(self.animationDuration)
contentAnimation.setStartValue(0)
contentAnimation.setEndValue(contentHeight)
class MainWindow(QMainWindow):
LIGHT_BLUE = '#148cc1'
MED_BLUE = '#0c6a94'
DARK_BLUE = '#0a3a6b'
PALE_SALMON = '#fd756d'
LIGHT_GREY = '#d2d5da'
SLATE = '#525863'
def __init__(self):
super().__init__()
self.WINDOW_STYLE = QStyleSheet(QMainWindow, background_color=self.SLATE)
self.WINDOW_STYLE = str(self.WINDOW_STYLE)
self.LABEL_STYLE = QStyleSheet(QLabel, color=self.DARK_BLUE, font_weight=400, font_size='9pt')
self.LABEL_STYLE = str(self.LABEL_STYLE)
# -- QPushButton stylesheet ---------------------
self.BUTTON_STYLE = s1 = QStyleSheet()
s1.setStyles(cls=QPushButton,
color='white',
font_weight=400,
border_style='solid',
padding='4px',
background_color=self.LIGHT_BLUE)
s1.setStyles(cls=QPushButton, psuedo=':pressed',
background_color=self.PALE_SALMON)
s1.setStyles(cls=QPushButton, psuedo=':focus-pressed',
background_color=self.PALE_SALMON)
s1.setStyles(cls=QPushButton, psuedo=':disabled',
background_color=self.LIGHT_GREY)
s1.setStyles(cls=QPushButton, psuedo=':checked',
background_color=self.PALE_SALMON)
s1.setStyles(cls=QPushButton, psuedo=':hover:!pressed:!checked',
background_color=self.MED_BLUE)
self.BUTTON_STYLE = str(self.BUTTON_STYLE)
self.BUTTON_GROUPBOX_STYLE = QStyleSheet(QGroupBox, border='none', font_weight='bold', color='white')
self.BUTTON_GROUPBOX_STYLE = str(self.BUTTON_GROUPBOX_STYLE)
self.TEXT_EDIT_STYLE = QStyleSheet(QTextEdit, color='white', border=f'1px solid {self.LIGHT_BLUE}', background_color=self.MED_BLUE)
self.TEXT_EDIT_STYLE = str(self.TEXT_EDIT_STYLE)
self.initUI()
def initUI(self):
contents_vbox = QVBoxLayout()
label_box = QHBoxLayout()
for text in ('hello', 'goodbye', 'adios'):
lbl = QLabel(text)
lbl.setStyleSheet(self.LABEL_STYLE)
lbl.setAlignment(Qt.AlignCenter)
label_box.addWidget(lbl)
button_group = QButtonGroup()
button_group.setExclusive(True)
button_group.buttonClicked.connect(self._button_clicked)
self.button_group = button_group
button_hbox = QHBoxLayout()
for _id, text in enumerate(('small', 'medium', 'large')):
btn = QPushButton(text)
btn.setCheckable(True)
btn.setStyleSheet(self.BUTTON_STYLE)
button_group.addButton(btn)
button_group.setId(btn, _id)
button_hbox.addWidget(btn)
button_group.buttons()[0].toggle()
text_area = QTextEdit()
text_area.setPlaceholderText('Type a greeting here')
text_area.setStyleSheet(self.TEXT_EDIT_STYLE)
contents_vbox.addLayout(label_box)
contents_vbox.addLayout(button_hbox)
contents_vbox.addWidget(text_area)
collapsible = Expander(self, 'Expander')
collapsible.setToggleButtonStyles({'padding': '4px', 'background-color': 'white'})
collapsible.setContentAreaStyles({'background-color': 'white'})
collapsible.setLayout(contents_vbox)
vbox = QVBoxLayout()
vbox.addWidget(collapsible)
vbox.setAlignment(Qt.AlignTop)
widget = QWidget()
widget.setLayout(vbox)
self.setCentralWidget(widget)
self.setGeometry(200, 200, 500, 400)
self.setWindowTitle('Expander')
self.setStyleSheet(self.WINDOW_STYLE)
self.show()
def _button_clicked(self, button):
"""
For the toggle behavior of a QButtonGroup to work you must
connect the clicked signal!
"""
print('button-active', self.button_group.id(button))
if __name__ == '__main__':
app = QApplication(sys.argv)
ex = MainWindow()
sys.exit(app.exec_())
最初的问题是想在 Qt Designer 中使用小部件，所以这是我制作的 @x squared 回购的一个分支：https://github.com/seanngpack/qt-collapsible-section
它适用于 QT5，要使其适用于 Qt 设计器，您只需构建并安装 repo。
关于如何执行此操作的文档不多，因此我可能会在稍后 post 描述该过程。
Qt Designer 的一个版本，灵感来自@x squared。要使用它，提升一个 QToolButton 并为其指定一个 QFrame 以折叠内容。
CollapseButton.h:
#include <QToolButton>
#include <QApplication>
#include <QDebug>
#pragma once
class CollapseButton : public QToolButton {
public:
CollapseButton(QWidget *parent) : QToolButton(parent), content_(nullptr) {
setCheckable(true);
setStyleSheet("background:none");
setIconSize(QSize(8, 8));
setFont(QApplication::font());
connect(this, &QToolButton::toggled, [=](bool checked) {
setArrowType(checked ? Qt::ArrowType::DownArrow : Qt::ArrowType::RightArrow);
content_ != nullptr && checked ? showContent() : hideContent();
});
}
void setText(const QString &text) {
QToolButton::setText(" " + text);
}
void setContent(QWidget *content) {
assert(content != nullptr);
content_ = content;
auto animation_ = new QPropertyAnimation(content_, "maximumHeight"); // QObject with auto delete
animation_->setStartValue(0);
animation_->setEasingCurve(QEasingCurve::InOutQuad);
animation_->setDuration(300);
animation_->setEndValue(content->geometry().height() + 10);
animator_.addAnimation(animation_);
if (!isChecked()) {
content->setMaximumHeight(0);
}
}
void hideContent() {
animator_.setDirection(QAbstractAnimation::Backward);
animator_.start();
}
void showContent() {
animator_.setDirection(QAbstractAnimation::Forward);
animator_.start();
}
private:
QWidget *content_;
QParallelAnimationGroup animator_;
};
在mainwindow.cpp中：
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow) {
ui->setupUi(this);
ui->toolButton->setContent(ui->contentFrame);
}
我想在 Qt 中创建一个具有以下功能的自定义小部件：
- 是容器
- 它可以填充任何 Qt 布局
- 它可以在任何 Qt 布局中
- 按钮允许collapse/fold垂直显示内容，因此只有按钮可见，所有包含的布局都是不可见的。
- 上一个按钮允许 expand/unfold 再次调整为布局内容的大小。
- expanding/collapsing 基于大小（而不是 show/hide）允许动画。
- 可在 QDesigner 中使用
为了提供一个想法，这是一个类似的小部件（不是 Qt）的图像：
我已经有一个可以正常工作并在 QDesigner 中公开的框架。我现在需要达到 extend/collapse，这似乎并不那么简单。
我尝试使用 resize()、sizePolicy()、sizeHint()，但它们不起作用： 当框架折叠时，我得到以下值：
sizeHint: (500,20)
size : (500,20)
closestAcceptableSize: (518,150)
Painted size: (518, 150)
QLayout::closestAcceptableSize 不是小部件的一部分，因此我无法更改它。
有任何提示 or/and 代码片段可以实现吗？
已编辑： 这里有一个简单的例子。除必要外，我删除了所有内容。
main.cpp 例子
#include <QWidget>
#include <QPushButton>
#include <QVBoxLayout>
#include "section.hpp"
using namespace myWidgets;
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
// Create the main Window
QWidget window;
window.resize(500,500);
window.setStyleSheet("QPushButton:{background-color:rgba(128,128,128,192);}");
// Create the main window layout
QVBoxLayout topLayout(&window);
QWidget *w1 = new QWidget();
w1->setStyleSheet("background-color:rgba(128,128,128,192);");
topLayout.addWidget(w1);
Section section(&window);
topLayout.addWidget(§ion);
QVBoxLayout inLayout(§ion);
QPushButton *button = new QPushButton();
button->setMinimumHeight(100);
inLayout.addWidget(button);
QWidget *w2 = new QWidget();
w2->setStyleSheet("background-color:rgba(128,128,128,192);");
topLayout.addWidget(w2);
window.show();
return a.exec();
}
Section.hpp
#ifndef SECTION_HPP
#define SECTION_HPP
#include <QPushButton> //for the expand/collapse button
#include <QtDesigner/QDesignerExportWidget>
#include <QLayout>
#include <QPainter>
#include <QPaintEvent>
#include <QDebug>
// Compatibility for noexcept, not supported in vsc++
#ifdef _MSC_VER
#define noexcept throw()
#endif
#if defined SECTION_BUILD
#define SECTION_BUILD_DLL_SPEC Q_DECL_EXPORT
#elif defined SECTION_EXEC
#define SECTION_BUILD_DLL_SPEC
#else
#define SECTION_BUILD_DLL_SPEC Q_DECL_IMPORT
#endif
namespace myWidgets
{
class SECTION_BUILD_DLL_SPEC Section : public QWidget
{
Q_OBJECT
Q_PROPERTY( bool is_expanded MEMBER isExpanded)
public:
// Constructor, standard
explicit Section( QWidget *parent=0 ): QWidget(parent),
expandButton(this)
{
expandButton.resize(20,20);
expandButton.move(0,0);
expandButton.connect(&expandButton, &QPushButton::clicked,
this, &Section::expandCollapseEvent);
QMargins m= contentsMargins();
m.setTop(m.top()+25);
setContentsMargins(m);
//setSizePolicy(sizePolicy().horizontalPolicy(), QSizePolicy::Minimum);
}
virtual void expand( bool expanding ) noexcept
{
resize(sizeHint());
isExpanded = expanding;
updateGeometry();
qDebug() << (isExpanded? "expanded":"collapsed") << sizeHint() << QWidget::size() <<
parentWidget()->layout()->closestAcceptableSize(this, size());
}
virtual QSize sizeHint() const noexcept override
{
if (isExpanded) return QSize(layout()->contentsRect().width(),
layout()->contentsRect().height());
else return QSize(layout()->contentsRect().width(), 20);
}
// Implement custom appearance
virtual void paintEvent(QPaintEvent *e) noexcept override
{
(void) e; //TODO: remove
QPainter p(this);
p.setClipRect(e->rect());
p.setRenderHint(QPainter::Antialiasing );
p.fillRect(e->rect(), QColor(0,0,255,128));
}
protected:
// on click of the expandButton, collapse/expand this widget
virtual void expandCollapseEvent() noexcept
{
expand(!isExpanded);
}
bool isExpanded = true; //whenever the section is collapsed(false) or expanded(true)
QPushButton expandButton; //the expanding/collapsing button
};
}
#endif // SECTION_HPP
我采用的方案是利用widget的MaximumSize属性来限制折叠时的高度
最大的问题是了解折叠时展开的高度，以允许正确的动画步骤。这还没有解决，我目前制作了一个固定高度步长的动画（我将其设置为与 window 的预期高度相关的适当值）。
if (toBeFolded)
{
unfoldedMaxHeight = maximumHeight();
previousUnfoldedHeight = height();
setMaximumHeight(25);
}
else
{
// animate maximumHeight from 25 up to where the height do not change
// A hint of the final maximumHeight is the previousUnfoldedHeight.
// After animation, set maximumHeight back to unfoldedMaxHeight.
}
我偶然发现了同样的问题，并通过将可折叠小部件实现为 QScrollArea 来解决它，其最大高度由 QPropertyAnimation 动画。
但是因为我不使用 QDesigner，所以我不能告诉你它是否在那里工作。
我还有一个问题：可折叠小部件不仅可以向底部方向扩展，还可以向顶部和底部扩展。如果位于其上方的小部件尚未达到其最小高度，这可能会导致它们缩小。但与我们必须自己构建这个东西的事实相比，这确实是一个细节......
Spoiler.h
#include <QFrame>
#include <QGridLayout>
#include <QParallelAnimationGroup>
#include <QScrollArea>
#include <QToolButton>
#include <QWidget>
class Spoiler : public QWidget {
Q_OBJECT
private:
QGridLayout mainLayout;
QToolButton toggleButton;
QFrame headerLine;
QParallelAnimationGroup toggleAnimation;
QScrollArea contentArea;
int animationDuration{300};
public:
explicit Spoiler(const QString & title = "", const int animationDuration = 300, QWidget *parent = 0);
void setContentLayout(QLayout & contentLayout);
};
Spoiler.cpp
#include <QPropertyAnimation>
#include "Spoiler.h"
Spoiler::Spoiler(const QString & title, const int animationDuration, QWidget *parent) : QWidget(parent), animationDuration(animationDuration) {
toggleButton.setStyleSheet("QToolButton { border: none; }");
toggleButton.setToolButtonStyle(Qt::ToolButtonTextBesideIcon);
toggleButton.setArrowType(Qt::ArrowType::RightArrow);
toggleButton.setText(title);
toggleButton.setCheckable(true);
toggleButton.setChecked(false);
headerLine.setFrameShape(QFrame::HLine);
headerLine.setFrameShadow(QFrame::Sunken);
headerLine.setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Maximum);
contentArea.setStyleSheet("QScrollArea { background-color: white; border: none; }");
contentArea.setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
// start out collapsed
contentArea.setMaximumHeight(0);
contentArea.setMinimumHeight(0);
// let the entire widget grow and shrink with its content
toggleAnimation.addAnimation(new QPropertyAnimation(this, "minimumHeight"));
toggleAnimation.addAnimation(new QPropertyAnimation(this, "maximumHeight"));
toggleAnimation.addAnimation(new QPropertyAnimation(&contentArea, "maximumHeight"));
// don't waste space
mainLayout.setVerticalSpacing(0);
mainLayout.setContentsMargins(0, 0, 0, 0);
int row = 0;
mainLayout.addWidget(&toggleButton, row, 0, 1, 1, Qt::AlignLeft);
mainLayout.addWidget(&headerLine, row++, 2, 1, 1);
mainLayout.addWidget(&contentArea, row, 0, 1, 3);
setLayout(&mainLayout);
QObject::connect(&toggleButton, &QToolButton::clicked, [this](const bool checked) {
toggleButton.setArrowType(checked ? Qt::ArrowType::DownArrow : Qt::ArrowType::RightArrow);
toggleAnimation.setDirection(checked ? QAbstractAnimation::Forward : QAbstractAnimation::Backward);
toggleAnimation.start();
});
}
void Spoiler::setContentLayout(QLayout & contentLayout) {
delete contentArea.layout();
contentArea.setLayout(&contentLayout);
const auto collapsedHeight = sizeHint().height() - contentArea.maximumHeight();
auto contentHeight = contentLayout.sizeHint().height();
for (int i = 0; i < toggleAnimation.animationCount() - 1; ++i) {
QPropertyAnimation * spoilerAnimation = static_cast<QPropertyAnimation *>(toggleAnimation.animationAt(i));
spoilerAnimation->setDuration(animationDuration);
spoilerAnimation->setStartValue(collapsedHeight);
spoilerAnimation->setEndValue(collapsedHeight + contentHeight);
}
QPropertyAnimation * contentAnimation = static_cast<QPropertyAnimation *>(toggleAnimation.animationAt(toggleAnimation.animationCount() - 1));
contentAnimation->setDuration(animationDuration);
contentAnimation->setStartValue(0);
contentAnimation->setEndValue(contentHeight);
}
使用方法：
…
auto * anyLayout = new QVBoxLayout();
anyLayout->addWidget(…);
…
Spoiler spoiler;
spoiler.setContentLayout(*anyLayout);
…
虽然这是旧的，但我发现这个帖子很有用。但是，我在 python 工作，所以我不得不转换 C++ 代码。 以防万一有人在寻找 python 版本的 x 平方解决方案。这是我的端口：
from PyQt4 import QtCore, QtGui
class Spoiler(QtGui.QWidget):
def __init__(self, parent=None, title='', animationDuration=300):
"""
References:
# Adapted from c++ version
"""
super(Spoiler, self).__init__(parent=parent)
self.animationDuration = animationDuration
self.toggleAnimation = QtCore.QParallelAnimationGroup()
self.contentArea = QtGui.QScrollArea()
self.headerLine = QtGui.QFrame()
self.toggleButton = QtGui.QToolButton()
self.mainLayout = QtGui.QGridLayout()
toggleButton = self.toggleButton
toggleButton.setStyleSheet("QToolButton { border: none; }")
toggleButton.setToolButtonStyle(QtCore.Qt.ToolButtonTextBesideIcon)
toggleButton.setArrowType(QtCore.Qt.RightArrow)
toggleButton.setText(str(title))
toggleButton.setCheckable(True)
toggleButton.setChecked(False)
headerLine = self.headerLine
headerLine.setFrameShape(QtGui.QFrame.HLine)
headerLine.setFrameShadow(QtGui.QFrame.Sunken)
headerLine.setSizePolicy(QtGui.QSizePolicy.Expanding, QtGui.QSizePolicy.Maximum)
self.contentArea.setStyleSheet("QScrollArea { background-color: white; border: none; }")
self.contentArea.setSizePolicy(QtGui.QSizePolicy.Expanding, QtGui.QSizePolicy.Fixed)
# start out collapsed
self.contentArea.setMaximumHeight(0)
self.contentArea.setMinimumHeight(0)
# let the entire widget grow and shrink with its content
toggleAnimation = self.toggleAnimation
toggleAnimation.addAnimation(QtCore.QPropertyAnimation(self, b"minimumHeight"))
toggleAnimation.addAnimation(QtCore.QPropertyAnimation(self, b"maximumHeight"))
toggleAnimation.addAnimation(QtCore.QPropertyAnimation(self.contentArea, b"maximumHeight"))
# don't waste space
mainLayout = self.mainLayout
mainLayout.setVerticalSpacing(0)
mainLayout.setContentsMargins(0, 0, 0, 0)
row = 0
mainLayout.addWidget(self.toggleButton, row, 0, 1, 1, QtCore.Qt.AlignLeft)
mainLayout.addWidget(self.headerLine, row, 2, 1, 1)
row += 1
mainLayout.addWidget(self.contentArea, row, 0, 1, 3)
self.setLayout(self.mainLayout)
def start_animation(checked):
arrow_type = QtCore.Qt.DownArrow if checked else QtCore.Qt.RightArrow
direction = QtCore.QAbstractAnimation.Forward if checked else QtCore.QAbstractAnimation.Backward
toggleButton.setArrowType(arrow_type)
self.toggleAnimation.setDirection(direction)
self.toggleAnimation.start()
self.toggleButton.clicked.connect(start_animation)
def setContentLayout(self, contentLayout):
# Not sure if this is equivalent to self.contentArea.destroy()
self.contentArea.destroy()
self.contentArea.setLayout(contentLayout)
collapsedHeight = self.sizeHint().height() - self.contentArea.maximumHeight()
contentHeight = contentLayout.sizeHint().height()
for i in range(self.toggleAnimation.animationCount()-1):
spoilerAnimation = self.toggleAnimation.animationAt(i)
spoilerAnimation.setDuration(self.animationDuration)
spoilerAnimation.setStartValue(collapsedHeight)
spoilerAnimation.setEndValue(collapsedHeight + contentHeight)
contentAnimation = self.toggleAnimation.animationAt(self.toggleAnimation.animationCount() - 1)
contentAnimation.setDuration(self.animationDuration)
contentAnimation.setStartValue(0)
contentAnimation.setEndValue(contentHeight)
我知道这不是回答问题的好方法，只是 link，但我认为这个博客 post 非常相关：
http://www.fancyaddress.com/blog/qt-2/create-something-like-the-widget-box-as-in-the-qt-designer/
它基于 QTreeWidget，并使用其已实现的展开/折叠功能。 它解释了如何将小部件添加到树形小部件项目，以及如何添加用于折叠/展开它们的按钮。
当然，所有功劳都归功于 post 作者。
我仔细研究了@LoPiTal 提供的优秀指针并将其转换为 PyQt5 (Python3)。我觉得很优雅。
如果有人正在寻找 PyQt 解决方案，这是我的代码：
import sys
from PyQt5.QtWidgets import (QPushButton, QDialog, QTreeWidget,
QTreeWidgetItem, QVBoxLayout,
QHBoxLayout, QFrame, QLabel,
QApplication)
class SectionExpandButton(QPushButton):
"""a QPushbutton that can expand or collapse its section
"""
def __init__(self, item, text = "", parent = None):
super().__init__(text, parent)
self.section = item
self.clicked.connect(self.on_clicked)
def on_clicked(self):
"""toggle expand/collapse of section by clicking
"""
if self.section.isExpanded():
self.section.setExpanded(False)
else:
self.section.setExpanded(True)
class CollapsibleDialog(QDialog):
"""a dialog to which collapsible sections can be added;
subclass and reimplement define_sections() to define sections and
add them as (title, widget) tuples to self.sections
"""
def __init__(self):
super().__init__()
self.tree = QTreeWidget()
self.tree.setHeaderHidden(True)
layout = QVBoxLayout()
layout.addWidget(self.tree)
self.setLayout(layout)
self.tree.setIndentation(0)
self.sections = []
self.define_sections()
self.add_sections()
def add_sections(self):
"""adds a collapsible sections for every
(title, widget) tuple in self.sections
"""
for (title, widget) in self.sections:
button1 = self.add_button(title)
section1 = self.add_widget(button1, widget)
button1.addChild(section1)
def define_sections(self):
"""reimplement this to define all your sections
and add them as (title, widget) tuples to self.sections
"""
widget = QFrame(self.tree)
layout = QHBoxLayout(widget)
layout.addWidget(QLabel("Bla"))
layout.addWidget(QLabel("Blubb"))
title = "Section 1"
self.sections.append((title, widget))
def add_button(self, title):
"""creates a QTreeWidgetItem containing a button
to expand or collapse its section
"""
item = QTreeWidgetItem()
self.tree.addTopLevelItem(item)
self.tree.setItemWidget(item, 0, SectionExpandButton(item, text = title))
return item
def add_widget(self, button, widget):
"""creates a QWidgetItem containing the widget,
as child of the button-QWidgetItem
"""
section = QTreeWidgetItem(button)
section.setDisabled(True)
self.tree.setItemWidget(section, 0, widget)
return section
if __name__ == "__main__":
app = QApplication(sys.argv)
window = CollapsibleDialog()
window.show()
sys.exit(app.exec_())
贡献一个使用 PySide2 的版本（python3 的官方 Qt5 绑定）
from PySide2 import QtCore, QtGui, QtWidgets
class Expander(QtWidgets.QWidget):
def __init__(self, parent=None, title='', animationDuration=300):
"""
References:
# Adapted from PyQt4 version
# Adapted from c++ version
"""
super(Expander, self).__init__(parent=parent)
self.animationDuration = animationDuration
self.toggleAnimation = QtCore.QParallelAnimationGroup()
self.contentArea = QtWidgets.QScrollArea()
self.headerLine = QtWidgets.QFrame()
self.toggleButton = QtWidgets.QToolButton()
self.mainLayout = QtWidgets.QGridLayout()
toggleButton = self.toggleButton
toggleButton.setStyleSheet("QToolButton { border: none; }")
toggleButton.setToolButtonStyle(QtCore.Qt.ToolButtonTextBesideIcon)
toggleButton.setArrowType(QtCore.Qt.RightArrow)
toggleButton.setText(str(title))
toggleButton.setCheckable(True)
toggleButton.setChecked(False)
headerLine = self.headerLine
headerLine.setFrameShape(QtWidgets.QFrame.HLine)
headerLine.setFrameShadow(QtWidgets.QFrame.Sunken)
headerLine.setSizePolicy(QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Maximum)
self.contentArea.setStyleSheet("QScrollArea { background-color: white; border: none; }")
self.contentArea.setSizePolicy(QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Fixed)
# start out collapsed
self.contentArea.setMaximumHeight(0)
self.contentArea.setMinimumHeight(0)
# let the entire widget grow and shrink with its content
toggleAnimation = self.toggleAnimation
toggleAnimation.addAnimation(QtCore.QPropertyAnimation(self, b"minimumHeight"))
toggleAnimation.addAnimation(QtCore.QPropertyAnimation(self, b"maximumHeight"))
toggleAnimation.addAnimation(QtCore.QPropertyAnimation(self.contentArea, b"maximumHeight"))
# don't waste space
mainLayout = self.mainLayout
mainLayout.setVerticalSpacing(0)
mainLayout.setContentsMargins(0, 0, 0, 0)
row = 0
mainLayout.addWidget(self.toggleButton, row, 0, 1, 1, QtCore.Qt.AlignLeft)
mainLayout.addWidget(self.headerLine, row, 2, 1, 1)
row += 1
mainLayout.addWidget(self.contentArea, row, 0, 1, 3)
self.setLayout(self.mainLayout)
def start_animation(checked):
arrow_type = QtCore.Qt.DownArrow if checked else QtCore.Qt.RightArrow
direction = QtCore.QAbstractAnimation.Forward if checked else QtCore.QAbstractAnimation.Backward
toggleButton.setArrowType(arrow_type)
self.toggleAnimation.setDirection(direction)
self.toggleAnimation.start()
self.toggleButton.clicked.connect(start_animation)
def setContentLayout(self, contentLayout):
# Not sure if this is equivalent to self.contentArea.destroy()
self.contentArea.destroy()
self.contentArea.setLayout(contentLayout)
collapsedHeight = self.sizeHint().height() - self.contentArea.maximumHeight()
contentHeight = contentLayout.sizeHint().height()
for i in range(self.toggleAnimation.animationCount()-1):
expandAnimation = self.toggleAnimation.animationAt(i)
expandAnimation.setDuration(self.animationDuration)
expandAnimation.setStartValue(collapsedHeight)
expandAnimation.setEndValue(collapsedHeight + contentHeight)
contentAnimation = self.toggleAnimation.animationAt(self.toggleAnimation.animationCount() - 1)
contentAnimation.setDuration(self.animationDuration)
contentAnimation.setStartValue(0)
contentAnimation.setEndValue(contentHeight)
我构建了 Python3/Qt5 样式示例来测试我正在编写的样式表 class。 我还修复了未考虑扩展按钮尺寸变化的尺寸计算问题。
为了和Qt保持一致，我也把方法改成了setLayout()
import sys
import inspect
import textwrap
from collections import OrderedDict, UserString
from PyQt5 import QtCore, QtGui
from PyQt5.QtCore import Qt
from PyQt5.QtGui import QIcon
from PyQt5.QtWidgets import *
class QStyleSheet(UserString):
"""
Represent stylesheets as dictionary key value pairs.
Update complex stylesheets easily modifying only the attributes you need
Allow for attribute inheritance or defaulting of stylesheets.
# TODO support [readOnly="true"] attribute-selectors
QTextEdit, QListView <-- you can have multiple classes.
QCheckBox::indicator <-- some psuedo classes have double colons
"""
def __init__(self, cls=None, name=None, psuedo=None, **styles):
"""
Arguments to the constructor allow you to default different properties of the CSS Class.
Any argument defined here will be global to this StyleSheet and cannot be overidden later.
:param cls: Default style prefix class to ``cls``
:param name: Default object name to ``name`` (hashtag) is not needed.
:param psuedo: Default psuedo class to ``psuedo``, example: ``:hover``
"""
self.cls_scope = cls
self.psuedo_scope = psuedo
self.name_scope = name
self._styles = OrderedDict() # we'll preserve the order of attributes given - python 3.6+
if styles:
self.setStylesDict(OrderedDict(styles))
def _ident(self, cls=None, name=None, psuedo=None):
# -- ensure value is of correct type ----------------------------------------
if cls is not None and not inspect.isclass(cls):
raise ValueError(f'cls must be None or a class object, got: {type(cls)}')
if name is not None and not isinstance(name, str):
raise ValueError(f'name must be None or a str, got: {type(name)}')
if psuedo is not None and not isinstance(psuedo, str):
raise ValueError(f'psuedo must be None or a str, got: {type(psuedo)}')
# -- ensure not overiding defaults -------------------------------------------
if cls is not None and self.cls_scope is not None:
raise ValueError(f'cls was set in __init__, you cannot override it')
if name is not None and self.name_scope is not None:
raise ValueError(f'name was set in __init__, you cannot override it')
if psuedo is not None and self.psuedo_scope is not None:
raise ValueError(f'psuedo was set in __init__, you cannot override it')
# -- apply defaults if set ---------------------------------------------------
if cls is None and self.cls_scope is not None:
cls = self.cls_scope
if name is None and self.name_scope is not None:
name = self.name_scope
if psuedo is None and self.psuedo_scope is not None:
psuedo = self.psuedo_scope
# return a tuple that can be used as a dictionary key.
ident = tuple([getattr(cls, '__name__', None), name or None, psuedo or None])
return ident
def _class_definition(self, ident):
"""Get the class definition string"""
cls, name, psuedo = ident
return '%s%s%s' % (cls or '', name or '', psuedo or '')
def _fix_underscores(self, styles):
return OrderedDict([(k.replace('_', '-'), v) for k,v in styles.items()])
def setStylesStr(self, styles):
"""
Parse styles from a string and set them on this object.
"""
raise NotImplementedError()
self._update()
def setStylesDict(self, styles, cls=None, name=None, psuedo=None):
"""
Set styles using a dictionary instead of keyword arguments
"""
styles = self._fix_underscores(styles)
if not isinstance(styles, dict):
raise ValueError(f'`styles` must be dict, got: {type(styles)}')
if not styles:
raise ValueError('`styles` cannot be empty')
ident = self._ident(cls, name, psuedo)
stored = self._styles.get(ident, OrderedDict())
stored.update(styles)
self._styles[ident] = stored
self._update()
def setStyles(self, cls=None, name=None, psuedo=None, **styles):
"""
Set or update styles according to the CSS Class definition provided by (cls, name, psuedo) using keyword-arguments.
Any css attribute with a hyphen ``-`` character should be changed to an underscore ``_`` when passed as a keyword argument.
Example::
Lets suppose we want to create the css class:
QFrame#BorderTest { background-color: white; margin:4px; border:1px solid #a5a5a5; border-radius: 10px;}
>>> stylesheet.setStyle(cls=QFrameBorderTest, background_color='white', margin='4px', border_radius='10px')
>>> print(stylesheet)
QFrame#BorderTest { background-color: white; margin:4px; border:1px solid #a5a5a5; border-radius: 10px;}
"""
styles = OrderedDict(styles)
self.setStylesDict(styles=styles, cls=cls, name=name, psuedo=psuedo)
def getStyles(self, cls=None, name=None, psuedo=None):
"""
Return the dictionary representations of styles for the CSS Class definition provided by (cls, name, psuedo)
:returns: styles dict (keys with hyphens)
"""
ident = self._ident(cls, name, psuedo)
return self._styles.get(ident)
def getClassIdents(self):
"""Get all class identifier tuples"""
return list(self._styles.keys())
def getClassDefinitions(self):
"""Get all css class definitions, but not the css attributes/body"""
return [self._class_definition(ident) for ident in self.getClassIdents()]
def validate(self):
"""
Validate all the styles and attributes on this class
"""
raise NotImplementedError()
def merge(self, stylesheet, overwrite=True):
"""
Merge another QStyleSheet with this QStyleSheet.
The QStyleSheet passed as an argument will be left un-modified.
:param overwrite: if set to True the matching class definitions will be overwritten
with attributes and values from ``stylesheet``.
Otherwise, the css attributes will be updated from ``stylesheet``
:type overwrite: QStyleSheet
"""
for ident in stylesheet.getClassIdents():
styles = stylesheet.getStyles(ident)
cls, name, psuedo = ident
self.setStylesDict(styles, cls=cls, name=name, psuedo=psuedo)
self._update()
def clear(self, cls=None, name=None, psuedo=None):
"""
Clear styles matching the Class definition
The style dictionary cleared will be returned
None will be returned if nothing was cleared.
"""
ident = self._ident(cls, name, psuedo)
return self._styles.pop(ident, None)
def _update(self):
"""Update the internal string representation"""
stylesheet = []
for ident, styles in self._styles.items():
if not styles:
continue
css_cls = self._class_definition(ident)
css_cls = css_cls + ' ' if css_cls else ''
styles_str = '\n'.join([f'{k}: {v};' for k, v in styles.items()])
styles_str = textwrap.indent(styles_str, ''.ljust(4))
stylesheet.append('%s{\n%s\n}' % (css_cls, styles_str))
self.data = '\n\n'.join(stylesheet)
class Expander(QWidget):
def __init__(self, parent=None, title=None, animationDuration=200):
super().__init__(parent=parent)
self.animationDuration = animationDuration
self.toggleAnimation = QtCore.QParallelAnimationGroup()
self.contentArea = QScrollArea()
self.headerLine = QFrame()
self.toggleButton = QToolButton()
self.mainLayout = QGridLayout()
toggleButton = self.toggleButton
self.toggleButtonQStyle = QStyleSheet(QToolButton, border='none')
toggleButton.setStyleSheet(str(self.toggleButtonQStyle))
toggleButton.setToolButtonStyle(QtCore.Qt.ToolButtonTextBesideIcon)
toggleButton.setArrowType(QtCore.Qt.RightArrow)
toggleButton.setText(title or '')
toggleButton.setCheckable(True)
toggleButton.setChecked(False)
toggleButton.setSizePolicy(QSizePolicy.Minimum, QSizePolicy.Minimum)
headerLine = self.headerLine
self.headerLineQStyle = QStyleSheet(QFrame)
headerLine.setFrameShape(QFrame.NoFrame) # see: https://doc.qt.io/archives/qt-4.8/qframe.html#Shape-enum
headerLine.setFrameShadow(QFrame.Plain) # see: https://doc.qt.io/archives/qt-4.8/qframe.html#Shape-enum
headerLine.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Maximum)
self.contentAreaQStyle = QStyleSheet(QScrollArea, border='none')
self.contentArea.setStyleSheet(str(self.contentAreaQStyle))
self.contentArea.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Fixed)
# start out collapsed
self.contentArea.setMaximumHeight(0)
self.contentArea.setMinimumHeight(0)
# let the entire widget grow and shrink with its content
toggleAnimation = self.toggleAnimation
toggleAnimation.addAnimation(QtCore.QPropertyAnimation(self, b"minimumHeight"))
toggleAnimation.addAnimation(QtCore.QPropertyAnimation(self, b"maximumHeight"))
toggleAnimation.addAnimation(QtCore.QPropertyAnimation(self.contentArea, b"maximumHeight"))
# don't waste space
mainLayout = self.mainLayout
mainLayout.setVerticalSpacing(0)
mainLayout.setContentsMargins(0, 0, 0, 0)
row = 0
mainLayout.addWidget(self.toggleButton, row, 0, 1, 1, QtCore.Qt.AlignLeft)
mainLayout.addWidget(self.headerLine, row, 2, 1, 1)
row += 1
mainLayout.addWidget(self.contentArea, row, 0, 1, 3)
super().setLayout(self.mainLayout)
def start_animation(checked):
arrow_type = QtCore.Qt.DownArrow if checked else QtCore.Qt.RightArrow
direction = QtCore.QAbstractAnimation.Forward if checked else QtCore.QAbstractAnimation.Backward
toggleButton.setArrowType(arrow_type)
self.toggleAnimation.setDirection(direction)
self.toggleAnimation.start()
self.toggleButton.clicked.connect(start_animation)
def setHeaderFrameStyles(self, styles):
self._setWidgetStyles(self.headerLine, self.headerLineQStyle, styles)
def setToggleButtonStyles(self, styles):
self._setWidgetStyles(self.toggleButton, self.toggleButtonQStyle, styles)
def setContentAreaStyles(self, styles):
self._setWidgetStyles(self.contentArea, self.contentAreaQStyle, styles)
def _setWidgetStyles(self, widget, qstylesheet, var):
if isinstance(var, QStyleSheet):
qstylesheet.merge(var)
widget.setStyleSheet(str(qstylesheet))
elif isinstance(var, dict):
qstylesheet.setStylesDict(var)
widget.setStyleSheet(str(qstylesheet))
elif isinstance(var, str):
widget.setStyleSheet(var)
else:
raise ValueError('invalid argument type: {type(var)}')
def setLayout(self, contentLayout):
"""
Set the layout container that you would like to expand/collapse.
This should be called after all styles are set.
"""
# Not sure if this is equivalent to self.contentArea.destroy()
self.contentArea.destroy()
self.contentArea.setLayout(contentLayout)
collapsedHeight = self.toggleButton.sizeHint().height()
contentHeight = contentLayout.sizeHint().height()
for i in range(self.toggleAnimation.animationCount()-1):
spoilerAnimation = self.toggleAnimation.animationAt(i)
spoilerAnimation.setDuration(self.animationDuration)
spoilerAnimation.setStartValue(collapsedHeight)
spoilerAnimation.setEndValue(collapsedHeight + contentHeight)
contentAnimation = self.toggleAnimation.animationAt(self.toggleAnimation.animationCount() - 1)
contentAnimation.setDuration(self.animationDuration)
contentAnimation.setStartValue(0)
contentAnimation.setEndValue(contentHeight)
class MainWindow(QMainWindow):
LIGHT_BLUE = '#148cc1'
MED_BLUE = '#0c6a94'
DARK_BLUE = '#0a3a6b'
PALE_SALMON = '#fd756d'
LIGHT_GREY = '#d2d5da'
SLATE = '#525863'
def __init__(self):
super().__init__()
self.WINDOW_STYLE = QStyleSheet(QMainWindow, background_color=self.SLATE)
self.WINDOW_STYLE = str(self.WINDOW_STYLE)
self.LABEL_STYLE = QStyleSheet(QLabel, color=self.DARK_BLUE, font_weight=400, font_size='9pt')
self.LABEL_STYLE = str(self.LABEL_STYLE)
# -- QPushButton stylesheet ---------------------
self.BUTTON_STYLE = s1 = QStyleSheet()
s1.setStyles(cls=QPushButton,
color='white',
font_weight=400,
border_style='solid',
padding='4px',
background_color=self.LIGHT_BLUE)
s1.setStyles(cls=QPushButton, psuedo=':pressed',
background_color=self.PALE_SALMON)
s1.setStyles(cls=QPushButton, psuedo=':focus-pressed',
background_color=self.PALE_SALMON)
s1.setStyles(cls=QPushButton, psuedo=':disabled',
background_color=self.LIGHT_GREY)
s1.setStyles(cls=QPushButton, psuedo=':checked',
background_color=self.PALE_SALMON)
s1.setStyles(cls=QPushButton, psuedo=':hover:!pressed:!checked',
background_color=self.MED_BLUE)
self.BUTTON_STYLE = str(self.BUTTON_STYLE)
self.BUTTON_GROUPBOX_STYLE = QStyleSheet(QGroupBox, border='none', font_weight='bold', color='white')
self.BUTTON_GROUPBOX_STYLE = str(self.BUTTON_GROUPBOX_STYLE)
self.TEXT_EDIT_STYLE = QStyleSheet(QTextEdit, color='white', border=f'1px solid {self.LIGHT_BLUE}', background_color=self.MED_BLUE)
self.TEXT_EDIT_STYLE = str(self.TEXT_EDIT_STYLE)
self.initUI()
def initUI(self):
contents_vbox = QVBoxLayout()
label_box = QHBoxLayout()
for text in ('hello', 'goodbye', 'adios'):
lbl = QLabel(text)
lbl.setStyleSheet(self.LABEL_STYLE)
lbl.setAlignment(Qt.AlignCenter)
label_box.addWidget(lbl)
button_group = QButtonGroup()
button_group.setExclusive(True)
button_group.buttonClicked.connect(self._button_clicked)
self.button_group = button_group
button_hbox = QHBoxLayout()
for _id, text in enumerate(('small', 'medium', 'large')):
btn = QPushButton(text)
btn.setCheckable(True)
btn.setStyleSheet(self.BUTTON_STYLE)
button_group.addButton(btn)
button_group.setId(btn, _id)
button_hbox.addWidget(btn)
button_group.buttons()[0].toggle()
text_area = QTextEdit()
text_area.setPlaceholderText('Type a greeting here')
text_area.setStyleSheet(self.TEXT_EDIT_STYLE)
contents_vbox.addLayout(label_box)
contents_vbox.addLayout(button_hbox)
contents_vbox.addWidget(text_area)
collapsible = Expander(self, 'Expander')
collapsible.setToggleButtonStyles({'padding': '4px', 'background-color': 'white'})
collapsible.setContentAreaStyles({'background-color': 'white'})
collapsible.setLayout(contents_vbox)
vbox = QVBoxLayout()
vbox.addWidget(collapsible)
vbox.setAlignment(Qt.AlignTop)
widget = QWidget()
widget.setLayout(vbox)
self.setCentralWidget(widget)
self.setGeometry(200, 200, 500, 400)
self.setWindowTitle('Expander')
self.setStyleSheet(self.WINDOW_STYLE)
self.show()
def _button_clicked(self, button):
"""
For the toggle behavior of a QButtonGroup to work you must
connect the clicked signal!
"""
print('button-active', self.button_group.id(button))
if __name__ == '__main__':
app = QApplication(sys.argv)
ex = MainWindow()
sys.exit(app.exec_())
最初的问题是想在 Qt Designer 中使用小部件，所以这是我制作的 @x squared 回购的一个分支：https://github.com/seanngpack/qt-collapsible-section
它适用于 QT5，要使其适用于 Qt 设计器，您只需构建并安装 repo。
关于如何执行此操作的文档不多，因此我可能会在稍后 post 描述该过程。
Qt Designer 的一个版本，灵感来自@x squared。要使用它，提升一个 QToolButton 并为其指定一个 QFrame 以折叠内容。
CollapseButton.h:
#include <QToolButton>
#include <QApplication>
#include <QDebug>
#pragma once
class CollapseButton : public QToolButton {
public:
CollapseButton(QWidget *parent) : QToolButton(parent), content_(nullptr) {
setCheckable(true);
setStyleSheet("background:none");
setIconSize(QSize(8, 8));
setFont(QApplication::font());
connect(this, &QToolButton::toggled, [=](bool checked) {
setArrowType(checked ? Qt::ArrowType::DownArrow : Qt::ArrowType::RightArrow);
content_ != nullptr && checked ? showContent() : hideContent();
});
}
void setText(const QString &text) {
QToolButton::setText(" " + text);
}
void setContent(QWidget *content) {
assert(content != nullptr);
content_ = content;
auto animation_ = new QPropertyAnimation(content_, "maximumHeight"); // QObject with auto delete
animation_->setStartValue(0);
animation_->setEasingCurve(QEasingCurve::InOutQuad);
animation_->setDuration(300);
animation_->setEndValue(content->geometry().height() + 10);
animator_.addAnimation(animation_);
if (!isChecked()) {
content->setMaximumHeight(0);
}
}
void hideContent() {
animator_.setDirection(QAbstractAnimation::Backward);
animator_.start();
}
void showContent() {
animator_.setDirection(QAbstractAnimation::Forward);
animator_.start();
}
private:
QWidget *content_;
QParallelAnimationGroup animator_;
};
在mainwindow.cpp中：
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow) {
ui->setupUi(this);
ui->toolButton->setContent(ui->contentFrame);
}