从QListWidget拖放到QPlainTextEdit

Question

我正在尝试实现从 QListWidget 拖放到 QPlainTextEdit 的功能。

我使用了 eventFilter，但不知道为什么 QPlainTextEdit 只接收到 Drag 事件，而 Drop 事件从来没有发生。

源代码：

from PyQt4 import QtGui, QtCore

class Window(QtGui.QMainWindow):
    def __init__(self):
        QtGui.QMainWindow.__init__(self)
        widget = QtGui.QWidget(self)
        self.setCentralWidget(widget)
        layout = QtGui.QVBoxLayout(widget)
        self.listA = QtGui.QListWidget(self)
        self.textedit = QtGui.QPlainTextEdit(self)
        self.textedit.installEventFilter(self)
        self.listA.setDragEnabled(True)

        for widget in (self.listA, self.textedit):
            widget.setAcceptDrops(True)
            layout.addWidget(widget)

        for item in 'One Two Three Four Five Six'.split():
            self.listA.addItem(item)

    def eventFilter(self, source, event):
        if (event.type() == QtCore.QEvent.DragEnter and source is self.textedit):
            event.accept()
            return False
        if (event.type() == QtCore.QEvent.Drop and source is self.textedit):
            print 'Drop'
            return False
        return QtGui.QMainWindow.eventFilter(self, source, event)

if __name__ == '__main__':

    import sys
    app = QtGui.QApplication(sys.argv)
    window = Window()
    window.show()
    sys.exit(app.exec_())

我该如何处理 Drop 事件，并将文本正确放入 QPlainTextEdit 中呢？

Answer 1

根据这个例子，如果一个事件被成功过滤了，就需要返回True。我其实不太确定，但至少看起来这个拖放功能是有效的。

from PyQt4 import QtGui, QtCore

class Window(QtGui.QMainWindow):
    def __init__(self):
        QtGui.QMainWindow.__init__(self)
        widget = QtGui.QWidget(self)
        self.setCentralWidget(widget)
        layout = QtGui.QVBoxLayout(widget)
        self.listA = QtGui.QListWidget(self)
        self.textedit = QtGui.QPlainTextEdit(self)
        self.textedit.installEventFilter(self)
        self.listA.setDragEnabled(True)

        for widget in (self.listA, self.textedit):
            widget.setAcceptDrops(True)
            layout.addWidget(widget)

        for item in 'One Two Three Four Five Six'.split():
            self.listA.addItem(item)

    def eventFilter(self, source, event):
        if (event.type() == QtCore.QEvent.DragEnter and source is self.textedit):
            event.accept()
            print 'DragEnter'
            return True
        elif (event.type() == QtCore.QEvent.Drop and source is self.textedit):
            print 'Drop'
            return True
        else:
            return super(Window, self).eventFilter(source, event)

if __name__ == '__main__':
    import sys
    app = QtGui.QApplication(sys.argv)
    window = Window()
    window.show()