在不影响任何其他小部件的情况下添加或删除 QWidget

Question

我有一个 PyQT 应用程序，它有一个工具栏、一组按钮和最后一行附加按钮。我想在用户可以隐藏或显示的底行下方添加一个 TextEdit。我希望 TextEdit 在显示时扩展底部，但是当用户隐藏它时，我希望在不影响任何其他按钮的高度、宽度或大小的情况下删除底部。想象一下，当用户隐藏它时，只需拿一把剪刀到 TextEdit 部分，然后在用户想要它时将其粘回去。这甚至可以在 PyQt 中完成吗？我发现最接近的是下面调整所有按钮大小的实现。

from PyQt5.QtCore import Qt, QPoint, QTimer, QThread, QSize
from PyQt5.QtGui import QFont, QImage, QPainter, QPen, QPixmap
from PyQt5.QtWidgets import (
    QAction, QApplication, QCheckBox, QFileDialog, QHBoxLayout, QLabel,
    QMainWindow, QMenu, QMenuBar, QPlainTextEdit, QPushButton, QSpacerItem,
    QSizePolicy, QFrame,
    QTextEdit, QVBoxLayout, QWidget, QGridLayout, QToolButton, QComboBox
)
from PyQt5.QtWidgets import QApplication
import sys


class AppWindow(QMainWindow):
    def __init__(self, main_widget):
        super(AppWindow, self).__init__()
        self.main_widget = main_widget
        self.setCentralWidget(self.main_widget)


class AppWidget(QWidget):
    def __init__(self, panels=[]):
        super(AppWidget, self).__init__()
        self.panels = panels
        self.main_layout = QVBoxLayout(self)

        self.setSizePolicy(
            QSizePolicy.MinimumExpanding,
            QSizePolicy.MinimumExpanding
        )

        self.toolbar_frame = QFrame(self)
        self.toolbar_frame_layout = QHBoxLayout(self.toolbar_frame)
        self.toolbar_frame_layout.addStretch()
        self.log_button = QToolButton(self.toolbar_frame)
        self.log_button.setText('Toggle Log')

        self.toolbar_frame_layout.addWidget(self.log_button)
        self.toolbar_frame.setLayout(self.toolbar_frame_layout)

        self.project_frame = QFrame(self)

        self.project_frame_layout = QHBoxLayout(self.project_frame)
        self.project_dropdown = QComboBox(self.project_frame)
        self.project_dropdown.setMinimumSize(20, 0)
        self.project_refresh = QToolButton(self.project_frame)
        self.project_refresh.setText('Refresh')
        self.project_frame_layout.addWidget(self.project_dropdown)
        self.project_frame_layout.addWidget(self.project_refresh)
        self.project_frame.setLayout(self.project_frame_layout)

        self.panel_frame = QFrame(self)
        self.panel_frame_layout = QVBoxLayout(self.panel_frame)
        for panel in panels:
            self.panel_frame_layout.addWidget(panel)
        self.panel_frame.setLayout(self.panel_frame_layout)

        self.bottom_frame = QFrame(self)
        self.bottom_frame_layout = QHBoxLayout(self.bottom_frame)
        self.bottom_frame_layout.addStretch()
        self.sg_button = QToolButton()
        self.sg_button.setText('Extra Stuff')
        self.bottom_frame_layout.addWidget(self.sg_button)
        self.bottom_frame.setLayout(self.bottom_frame_layout)

        self.log = QTextEdit()
        self.log_frame = QFrame(self)
        self.log_frame_layout = QHBoxLayout(self.log_frame)
        self.log_frame_layout.addWidget(self.log)
        self.log_frame.setLayout(self.log_frame_layout)

        self.main_layout.addWidget(self.toolbar_frame)
        self.main_layout.addWidget(self.project_frame)
        self.main_layout.addWidget(self.panel_frame)
        self.main_layout.addWidget(self.bottom_frame)
        self.app_widgets = QWidget(self)
        self.app_widgets.setLayout(self.main_layout)
        self.log_widget = QWidget(self)
        self.log_widget.setLayout(self.log_frame_layout)

        self.total_layout = QVBoxLayout(self)
        self.total_layout.addWidget(self.app_widgets)
        self.total_layout.addWidget(self.log_widget)

        self.setLayout(self.total_layout)

        self.log_button.clicked.connect(self.toggle_log)

    def toggle_log(self):
        if self.log_widget.isHidden():
            self.log_widget.show()
            QTimer.singleShot(0, self.resize_show)
        else:
            self.log_widget.hide()
            QTimer.singleShot(0, self.resize_hide)
        # self.adjustSize() Also does not work.
    def resize_show(self):
        self.resize(self.width(), self.sizeHint().height())

    def resize_hide(self):
        self.resize(self.width(), self.minimumSizeHint().height())


class AppPanel(QWidget):
    def __init__(self, sections=[]):
        super(AppPanel, self).__init__()
        self.setSizePolicy(
            QSizePolicy.MinimumExpanding,
            QSizePolicy.MinimumExpanding
        )
        self.layout = QVBoxLayout(self)
        self.setLayout(self.layout)
        self.sections = sections
        for section in self.sections:
            self.layout.addWidget(section)


class AppSection(QWidget):
    def __init__(self, buttons=[]):
        super(AppSection, self).__init__()
        self.setSizePolicy(
            QSizePolicy.MinimumExpanding,
            QSizePolicy.MinimumExpanding
        )
        self.buttons = buttons
        self.layout = QGridLayout()
        for i, button in enumerate(self.buttons):
            col = i % 2
            row = i // 2
            self.layout.addWidget(button, row, col)
        self.setLayout(self.layout)


class AppButton(QToolButton):
    def __init__(self, text=''):
        super(AppButton, self).__init__()
        self.setText(text)
        self.setFocusPolicy(Qt.NoFocus)
        self.setIconSize(QSize(50, 50))
        self.setToolButtonStyle(Qt.ToolButtonTextBesideIcon)
        self.setSizePolicy(QSizePolicy.MinimumExpanding, QSizePolicy.MinimumExpanding)


if __name__ == '__main__':
    app = QApplication(sys.argv)
    app_buttons = [AppButton(text='APPS ' + str(i)) for i in range(5)]
    custom_btns = [AppButton(text='Custom ' + str(i)) for i in range(5)]
    app_section = AppSection(buttons=app_buttons)
    custom_section = AppSection(buttons=custom_btns)
    panels = [AppPanel(sections=[app_section, custom_section])]
    ex = AppWidget(panels=panels)
    lw = AppWindow(main_widget=ex)
    lw.show()
    app.exec_()

Answer 1

您可以为顶部小部件设置对齐策略：

[...]
self.total_layout.setAlignment(self.app_widgets, Qt.AlignTop)

self.setLayout(self.total_layout)
[...]

当您隐藏文本编辑时，app_widget 将不再调整大小。

Answer 2

单独调整小部件的大小不是有效的解决方案，因为它只会覆盖布局设置的几何图形而不通知父小部件。

这也很重要，因为在显示日志时不应仅根据其提示调整小部件的大小：如果在隐藏日志时增加 window 的大小然后再次显示它，它不会占用所有可用的 space.

您需要做的是访问顶层 window，强制其布局重新布局其内容，并使用其提示来调整大小。

    def resize_hide(self):
        self.window().layout().activate()
        self.window().resize(
            self.window().width(), 
            self.window().minimumSizeHint().height()
        )

在不影响任何其他小部件的情况下添加或删除 QWidget

Adding or removing a QWidget without affecting any other widgets

python

pyqt

pyqt5