在 Python 中使用 QT Designer (.ui) 文件时如何启用 QDropEvent?
How to enable QDropEvent when using a QT Designer (.ui) file in Python?
使用 的答案,我已经能够在不使用 QT Designer (.ui) 文件时触发 QDropEvent
;但我似乎无法让它工作。
根据 this documentation and this example 看来我应该只需要将 .setAcceptDrops()
设置为 True
对于 QComboBox
我想接受事件,并实施 dragEnterEvent
和 dropEvent
具有所有必要的逻辑。我对 C++ 不是很流利,所以我只理解了一些例子,但在大多数情况下它看起来很简单。
我为此创建的示例没有抛出任何异常,当我尝试将文本文件从 Windows Explorer 拖放到 cb1
QComboBox
时似乎没有任何反应.我觉得我错过了一些简单的东西,但我不确定是什么。有什么想法吗?
使用 Python 3.7 和 PyQt5
main.ui
<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>MainWindow</class>
<widget class="QMainWindow" name="MainWindow">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>269</width>
<height>116</height>
</rect>
</property>
<property name="windowTitle">
<string>MainWindow</string>
</property>
<widget class="QWidget" name="centralwidget">
<layout class="QGridLayout" name="gridLayout">
<item row="3" column="1">
<widget class="QComboBox" name="cb4">
<property name="sizePolicy">
<sizepolicy hsizetype="Expanding" vsizetype="Fixed">
<horstretch>0</horstretch>
<verstretch>0</verstretch>
</sizepolicy>
</property>
</widget>
</item>
<item row="1" column="1">
<widget class="QComboBox" name="cb2">
<property name="sizePolicy">
<sizepolicy hsizetype="Expanding" vsizetype="Fixed">
<horstretch>0</horstretch>
<verstretch>0</verstretch>
</sizepolicy>
</property>
</widget>
</item>
<item row="2" column="1">
<widget class="QComboBox" name="cb3">
<property name="sizePolicy">
<sizepolicy hsizetype="Expanding" vsizetype="Fixed">
<horstretch>0</horstretch>
<verstretch>0</verstretch>
</sizepolicy>
</property>
</widget>
</item>
<item row="0" column="1">
<widget class="QComboBox" name="cb1">
<property name="sizePolicy">
<sizepolicy hsizetype="Expanding" vsizetype="Fixed">
<horstretch>0</horstretch>
<verstretch>0</verstretch>
</sizepolicy>
</property>
</widget>
</item>
<item row="0" column="0">
<widget class="QLabel" name="l1">
<property name="text">
<string>cb1</string>
</property>
</widget>
</item>
<item row="1" column="0">
<widget class="QLabel" name="l2">
<property name="text">
<string>cb2</string>
</property>
</widget>
</item>
<item row="2" column="0">
<widget class="QLabel" name="l3">
<property name="text">
<string>cb3</string>
</property>
</widget>
</item>
<item row="3" column="0">
<widget class="QLabel" name="l4">
<property name="text">
<string>cb4</string>
</property>
</widget>
</item>
</layout>
</widget>
</widget>
<resources/>
<connections/>
</ui>
QComboBoxDrop.py
from PyQt5 import uic
from PyQt5.Qt import Qt
from PyQt5.QtWidgets import QApplication, QMainWindow
import sys
Ui_main = uic.loadUiType(r'main.ui')[0]
class MinExample(QMainWindow, Ui_main):
def __init__(self, parent = None, flags = Qt.Window):
QMainWindow.__init__(self, parent, flags)
self.setupUi(self)
self.cb1.addItems(["item {}".format(i) for i in range(5)])
self.cb2.addItems(["item {}".format(i) for i in range(5)])
self.cb3.addItems(["item {}".format(i) for i in range(5)])
self.cb4.addItems(["item {}".format(i) for i in range(5)])
self.cb1.setAcceptDrops(True)
def dragEnterEvent(self, event):
print("dragEnterEvent Occurred")
event.acceptProposedAction()
def dropEvent(self, event):
print("dropEvent Occurred")
if __name__ == '__main__':
app = QApplication(sys.argv)
w = MinExample()
w.show()
sys.exit(app.exec_())
如果您已经有一个 class 实现了您想要的逻辑并希望在 Qt Designer 中使用它,正确的选择是使用提升,因为它遵循中的步骤此答案和步骤 4.1 更改为以下内容:
另一方面,如果小部件是 window 的子项,我的旧 post 解决方案将不起作用,在这种情况下,您必须覆盖 dragMoveEvent 方法。
综合以上,解决方案是:
├── main.py
├── main.ui
└── qcomboboxdrop.py
main.py
from PyQt5 import uic, QtCore, QtWidgets
Ui_main = uic.loadUiType(r'main.ui')[0]
class MinExample(QtWidgets.QMainWindow, Ui_main):
def __init__(self, parent = None, flags = QtCore.Qt.Window):
super(MinExample, self).__init__(parent, flags)
self.setupUi(self)
self.cb1.addItems(["item {}".format(i) for i in range(5)])
self.cb2.addItems(["item {}".format(i) for i in range(5)])
self.cb3.addItems(["item {}".format(i) for i in range(5)])
self.cb4.addItems(["item {}".format(i) for i in range(5)])
if __name__ == '__main__':
import sys
app = QtWidgets.QApplication(sys.argv)
w = MinExample()
w.show()
sys.exit(app.exec_())
main.ui
<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>MainWindow</class>
<widget class="QMainWindow" name="MainWindow">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>269</width>
<height>148</height>
</rect>
</property>
<property name="windowTitle">
<string>MainWindow</string>
</property>
<widget class="QWidget" name="centralwidget">
<layout class="QGridLayout" name="gridLayout">
<item row="3" column="1">
<widget class="QComboBoxDrop" name="cb4">
<property name="sizePolicy">
<sizepolicy hsizetype="Expanding" vsizetype="Fixed">
<horstretch>0</horstretch>
<verstretch>0</verstretch>
</sizepolicy>
</property>
</widget>
</item>
<item row="1" column="1">
<widget class="QComboBoxDrop" name="cb2">
<property name="sizePolicy">
<sizepolicy hsizetype="Expanding" vsizetype="Fixed">
<horstretch>0</horstretch>
<verstretch>0</verstretch>
</sizepolicy>
</property>
</widget>
</item>
<item row="2" column="1">
<widget class="QComboBoxDrop" name="cb3">
<property name="sizePolicy">
<sizepolicy hsizetype="Expanding" vsizetype="Fixed">
<horstretch>0</horstretch>
<verstretch>0</verstretch>
</sizepolicy>
</property>
</widget>
</item>
<item row="0" column="1">
<widget class="QComboBoxDrop" name="cb1">
<property name="sizePolicy">
<sizepolicy hsizetype="Expanding" vsizetype="Fixed">
<horstretch>0</horstretch>
<verstretch>0</verstretch>
</sizepolicy>
</property>
</widget>
</item>
<item row="0" column="0">
<widget class="QLabel" name="l1">
<property name="text">
<string>cb1</string>
</property>
</widget>
</item>
<item row="1" column="0">
<widget class="QLabel" name="l2">
<property name="text">
<string>cb2</string>
</property>
</widget>
</item>
<item row="2" column="0">
<widget class="QLabel" name="l3">
<property name="text">
<string>cb3</string>
</property>
</widget>
</item>
<item row="3" column="0">
<widget class="QLabel" name="l4">
<property name="text">
<string>cb4</string>
</property>
</widget>
</item>
</layout>
</widget>
</widget>
<customwidgets>
<customwidget>
<class>QComboBoxDrop</class>
<extends>QComboBox</extends>
<header>qcomboboxdrop.h</header>
</customwidget>
</customwidgets>
<resources/>
<connections/>
</ui>
qcomboboxdrop.py
from PyQt5 import QtCore, QtWidgets
class QComboBoxDrop(QtWidgets.QComboBox):
def __init__(self, *args, **kwargs):
super(QComboBoxDrop, self).__init__(*args, **kwargs)
self.setAcceptDrops(True)
def dragEnterEvent(self, event):
# print("formats: ", event.mimeData().formats())
if event.mimeData().hasFormat("text/plain"):
event.acceptProposedAction()
def dragMoveEvent(self, event):
if event.mimeData().hasFormat("text/plain"):
event.acceptProposedAction()
def dropEvent(self, event):
url =QtCore.QUrl(event.mimeData().text().strip())
if url.isLocalFile():
file = QtCore.QFile(url.toLocalFile())
if file.open(QtCore.QFile.ReadOnly|QtCore.QFile.Text):
ts = QtCore.QTextStream(file)
while not ts.atEnd():
print(ts.readLine())
if __name__ == '__main__':
import sys
app = QtWidgets.QApplication(sys.argv)
w = QComboBoxDrop()
w.addItems(["item {}".format(i) for i in range(10)])
w.show()
sys.exit(app.exec_())
使用 QDropEvent
;但我似乎无法让它工作。
根据 this documentation and this example 看来我应该只需要将 .setAcceptDrops()
设置为 True
对于 QComboBox
我想接受事件,并实施 dragEnterEvent
和 dropEvent
具有所有必要的逻辑。我对 C++ 不是很流利,所以我只理解了一些例子,但在大多数情况下它看起来很简单。
我为此创建的示例没有抛出任何异常,当我尝试将文本文件从 Windows Explorer 拖放到 cb1
QComboBox
时似乎没有任何反应.我觉得我错过了一些简单的东西,但我不确定是什么。有什么想法吗?
使用 Python 3.7 和 PyQt5
main.ui
<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>MainWindow</class>
<widget class="QMainWindow" name="MainWindow">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>269</width>
<height>116</height>
</rect>
</property>
<property name="windowTitle">
<string>MainWindow</string>
</property>
<widget class="QWidget" name="centralwidget">
<layout class="QGridLayout" name="gridLayout">
<item row="3" column="1">
<widget class="QComboBox" name="cb4">
<property name="sizePolicy">
<sizepolicy hsizetype="Expanding" vsizetype="Fixed">
<horstretch>0</horstretch>
<verstretch>0</verstretch>
</sizepolicy>
</property>
</widget>
</item>
<item row="1" column="1">
<widget class="QComboBox" name="cb2">
<property name="sizePolicy">
<sizepolicy hsizetype="Expanding" vsizetype="Fixed">
<horstretch>0</horstretch>
<verstretch>0</verstretch>
</sizepolicy>
</property>
</widget>
</item>
<item row="2" column="1">
<widget class="QComboBox" name="cb3">
<property name="sizePolicy">
<sizepolicy hsizetype="Expanding" vsizetype="Fixed">
<horstretch>0</horstretch>
<verstretch>0</verstretch>
</sizepolicy>
</property>
</widget>
</item>
<item row="0" column="1">
<widget class="QComboBox" name="cb1">
<property name="sizePolicy">
<sizepolicy hsizetype="Expanding" vsizetype="Fixed">
<horstretch>0</horstretch>
<verstretch>0</verstretch>
</sizepolicy>
</property>
</widget>
</item>
<item row="0" column="0">
<widget class="QLabel" name="l1">
<property name="text">
<string>cb1</string>
</property>
</widget>
</item>
<item row="1" column="0">
<widget class="QLabel" name="l2">
<property name="text">
<string>cb2</string>
</property>
</widget>
</item>
<item row="2" column="0">
<widget class="QLabel" name="l3">
<property name="text">
<string>cb3</string>
</property>
</widget>
</item>
<item row="3" column="0">
<widget class="QLabel" name="l4">
<property name="text">
<string>cb4</string>
</property>
</widget>
</item>
</layout>
</widget>
</widget>
<resources/>
<connections/>
</ui>
QComboBoxDrop.py
from PyQt5 import uic
from PyQt5.Qt import Qt
from PyQt5.QtWidgets import QApplication, QMainWindow
import sys
Ui_main = uic.loadUiType(r'main.ui')[0]
class MinExample(QMainWindow, Ui_main):
def __init__(self, parent = None, flags = Qt.Window):
QMainWindow.__init__(self, parent, flags)
self.setupUi(self)
self.cb1.addItems(["item {}".format(i) for i in range(5)])
self.cb2.addItems(["item {}".format(i) for i in range(5)])
self.cb3.addItems(["item {}".format(i) for i in range(5)])
self.cb4.addItems(["item {}".format(i) for i in range(5)])
self.cb1.setAcceptDrops(True)
def dragEnterEvent(self, event):
print("dragEnterEvent Occurred")
event.acceptProposedAction()
def dropEvent(self, event):
print("dropEvent Occurred")
if __name__ == '__main__':
app = QApplication(sys.argv)
w = MinExample()
w.show()
sys.exit(app.exec_())
如果您已经有一个 class 实现了您想要的逻辑并希望在 Qt Designer 中使用它,正确的选择是使用提升,因为它遵循中的步骤此答案和步骤 4.1 更改为以下内容:
另一方面,如果小部件是 window 的子项,我的旧 post 解决方案将不起作用,在这种情况下,您必须覆盖 dragMoveEvent 方法。
综合以上,解决方案是:
├── main.py
├── main.ui
└── qcomboboxdrop.py
main.py
from PyQt5 import uic, QtCore, QtWidgets
Ui_main = uic.loadUiType(r'main.ui')[0]
class MinExample(QtWidgets.QMainWindow, Ui_main):
def __init__(self, parent = None, flags = QtCore.Qt.Window):
super(MinExample, self).__init__(parent, flags)
self.setupUi(self)
self.cb1.addItems(["item {}".format(i) for i in range(5)])
self.cb2.addItems(["item {}".format(i) for i in range(5)])
self.cb3.addItems(["item {}".format(i) for i in range(5)])
self.cb4.addItems(["item {}".format(i) for i in range(5)])
if __name__ == '__main__':
import sys
app = QtWidgets.QApplication(sys.argv)
w = MinExample()
w.show()
sys.exit(app.exec_())
main.ui
<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>MainWindow</class>
<widget class="QMainWindow" name="MainWindow">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>269</width>
<height>148</height>
</rect>
</property>
<property name="windowTitle">
<string>MainWindow</string>
</property>
<widget class="QWidget" name="centralwidget">
<layout class="QGridLayout" name="gridLayout">
<item row="3" column="1">
<widget class="QComboBoxDrop" name="cb4">
<property name="sizePolicy">
<sizepolicy hsizetype="Expanding" vsizetype="Fixed">
<horstretch>0</horstretch>
<verstretch>0</verstretch>
</sizepolicy>
</property>
</widget>
</item>
<item row="1" column="1">
<widget class="QComboBoxDrop" name="cb2">
<property name="sizePolicy">
<sizepolicy hsizetype="Expanding" vsizetype="Fixed">
<horstretch>0</horstretch>
<verstretch>0</verstretch>
</sizepolicy>
</property>
</widget>
</item>
<item row="2" column="1">
<widget class="QComboBoxDrop" name="cb3">
<property name="sizePolicy">
<sizepolicy hsizetype="Expanding" vsizetype="Fixed">
<horstretch>0</horstretch>
<verstretch>0</verstretch>
</sizepolicy>
</property>
</widget>
</item>
<item row="0" column="1">
<widget class="QComboBoxDrop" name="cb1">
<property name="sizePolicy">
<sizepolicy hsizetype="Expanding" vsizetype="Fixed">
<horstretch>0</horstretch>
<verstretch>0</verstretch>
</sizepolicy>
</property>
</widget>
</item>
<item row="0" column="0">
<widget class="QLabel" name="l1">
<property name="text">
<string>cb1</string>
</property>
</widget>
</item>
<item row="1" column="0">
<widget class="QLabel" name="l2">
<property name="text">
<string>cb2</string>
</property>
</widget>
</item>
<item row="2" column="0">
<widget class="QLabel" name="l3">
<property name="text">
<string>cb3</string>
</property>
</widget>
</item>
<item row="3" column="0">
<widget class="QLabel" name="l4">
<property name="text">
<string>cb4</string>
</property>
</widget>
</item>
</layout>
</widget>
</widget>
<customwidgets>
<customwidget>
<class>QComboBoxDrop</class>
<extends>QComboBox</extends>
<header>qcomboboxdrop.h</header>
</customwidget>
</customwidgets>
<resources/>
<connections/>
</ui>
qcomboboxdrop.py
from PyQt5 import QtCore, QtWidgets
class QComboBoxDrop(QtWidgets.QComboBox):
def __init__(self, *args, **kwargs):
super(QComboBoxDrop, self).__init__(*args, **kwargs)
self.setAcceptDrops(True)
def dragEnterEvent(self, event):
# print("formats: ", event.mimeData().formats())
if event.mimeData().hasFormat("text/plain"):
event.acceptProposedAction()
def dragMoveEvent(self, event):
if event.mimeData().hasFormat("text/plain"):
event.acceptProposedAction()
def dropEvent(self, event):
url =QtCore.QUrl(event.mimeData().text().strip())
if url.isLocalFile():
file = QtCore.QFile(url.toLocalFile())
if file.open(QtCore.QFile.ReadOnly|QtCore.QFile.Text):
ts = QtCore.QTextStream(file)
while not ts.atEnd():
print(ts.readLine())
if __name__ == '__main__':
import sys
app = QtWidgets.QApplication(sys.argv)
w = QComboBoxDrop()
w.addItems(["item {}".format(i) for i in range(10)])
w.show()
sys.exit(app.exec_())