如何在pyqt中将鼠标悬停在QTableWidget项的事件上? [英] How to catch mouse over event of QTableWidget item in pyqt?

问题描述

当我将鼠标悬停在QTableWidget的项目上时，我想做的就是更改QTableWidget项的颜色.

what I want to do is to change the color of a QTableWidget item, when I hover with the mouse over the item of my QTableWidget.

推荐答案

首先，表格小部件需要具有

Firstly, the table widget needs to have mouse-tracking switched on to get the hover events.

第二，我们需要找到一些信号来告诉我们鼠标何时进入和离开表格单元格，以便可以在正确的时间更改背景颜色.

Secondly, we need to find some signals that tell us when the mouse enters and leaves the table cells, so that the background colours can be changed at the right times.

QTableWidget类具有 cellEntered / itemEntered 信号，但是当鼠标离开单元格时没有任何作用.因此，我们将需要创建一些自定义信号来做到这一点.

The QTableWidget class has the cellEntered / itemEntered signals, but there is nothing for when the mouse leaves a cell. So, we will need to create some custom signals to do that.

下面的演示脚本中的TableWidget类设置了必要的cellExited/itemExited信号，然后说明了如何使用鼠标悬停以挂钩一切来更改项目背景:

The TableWidget class in the demo script below sets up the necessary cellExited / itemExited signals, and then shows how everything can be hooked up to change the item background when hovering with the mouse:

from PyQt4 import QtGui, QtCore

class TableWidget(QtGui.QTableWidget):
    cellExited = QtCore.pyqtSignal(int, int)
    itemExited = QtCore.pyqtSignal(QtGui.QTableWidgetItem)

    def __init__(self, rows, columns, parent=None):
        QtGui.QTableWidget.__init__(self, rows, columns, parent)
        self._last_index = QtCore.QPersistentModelIndex()
        self.viewport().installEventFilter(self)

    def eventFilter(self, widget, event):
        if widget is self.viewport():
            index = self._last_index
            if event.type() == QtCore.QEvent.MouseMove:
                index = self.indexAt(event.pos())
            elif event.type() == QtCore.QEvent.Leave:
                index = QtCore.QModelIndex()
            if index != self._last_index:
                row = self._last_index.row()
                column = self._last_index.column()
                item = self.item(row, column)
                if item is not None:
                    self.itemExited.emit(item)
                self.cellExited.emit(row, column)
                self._last_index = QtCore.QPersistentModelIndex(index)
        return QtGui.QTableWidget.eventFilter(self, widget, event)

class Window(QtGui.QWidget):
    def __init__(self, rows, columns):
        QtGui.QWidget.__init__(self)
        self.table = TableWidget(rows, columns, self)
        for column in range(columns):
            for row in range(rows):
                item = QtGui.QTableWidgetItem('Text%d' % row)
                self.table.setItem(row, column, item)
        layout = QtGui.QVBoxLayout(self)
        layout.addWidget(self.table)
        self.table.setMouseTracking(True)
        self.table.itemEntered.connect(self.handleItemEntered)
        self.table.itemExited.connect(self.handleItemExited)

    def handleItemEntered(self, item):
        item.setBackground(QtGui.QColor('moccasin'))

    def handleItemExited(self, item):
        item.setBackground(QtGui.QTableWidgetItem().background())

if __name__ == '__main__':

    import sys
    app = QtGui.QApplication(sys.argv)
    window = Window(6, 3)
    window.setGeometry(500, 300, 350, 250)
    window.show()
    sys.exit(app.exec_())

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