gpt4 book ai didi

python - 在 Python 中使用 QT Designer (.ui) 文件时如何启用 QDropEvent?

转载 作者:行者123 更新时间:2023-12-01 08:29:40 25 4
gpt4 key购买 nike

使用 this 中的答案当不使用 QT Designer (.ui) 文件时,我已经能够触发 QDropEvent ;但我似乎无法让它正常工作。

根据this documentationthis example看来我只需要为 QComboBox 设置 .setAcceptDrops()True 我想接受该事件,并实现 dragEnterEventdropEvent 以及所有必要的逻辑。我对 C++ 不太熟悉,所以我只理解一些示例,但大部分内容看起来很简单。

我为此创建的示例不会引发任何异常,当我尝试将文本文件从 Windows 资源管理器拖放到 cb1 QComboBox 时,似乎没有发生任何情况。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_())

最佳答案

如果您已经有一个类实现了您想要的逻辑并希望在 Qt Designer 中使用它,正确的选项是使用提升,因为它遵循此答案和步骤 4.1 中的步骤更改为以下内容:

enter image description here

另一方面,如果小部件是窗口的子窗口,我对旧帖子的解决方案将不起作用,在这种情况下,您必须覆盖 DragMoveEvent 方法。

考虑到上述情况,解决方案是:

├── main.py
├── main.ui
└── qcomboboxdrop.py

ma​​in.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_())

ma​​in.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_())

关于python - 在 Python 中使用 QT Designer (.ui) 文件时如何启用 QDropEvent?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/53973670/

25 4 0
Copyright 2021 - 2024 cfsdn All Rights Reserved 蜀ICP备2022000587号
广告合作:1813099741@qq.com 6ren.com