如何向QTableWidget的单元格添加右键单击操作(不是菜单)

时间:2018-06-04 13:05:30

标签: python pyqt pyqt5 qtablewidget

我目前有一个QTableWidget与不同的单元格。当我左键单击一个单元格时,我希望它上面的数字增加1,如果我右键单击,我希望数字减少1。

对于第一部分,我使用

没有问题
self.(widget_name).cellClicked.connect(self.addone)

右键单击会出现问题。有内置的方法吗?我怎样才能实现它?我尝试从QTableWidgets创建我自己的Table类并覆盖mousePressEvent但是没有工作(点击单元格没有做任何事情,它甚至没有选择单元格)。还尝试了eventFilter而没有。请参阅下文,了解我在两种情况下使用的确切代码。

对于mousePressEvent:

class Table(QtWidgets.QTableWidget):

    def __init__(self,parent=None):
        QtWidgets.QTableWidget.__init__(self,parent)

    def mousePressEvent(self,QMouseEvent):
        if QMouseEvent.button() == QtCore.LeftButton:
            print('left') #FOR DEBUGGING
            row = self.currentRow()
            column = self.currentColumn()
            new_text = round(float(self.item(row,column).text()) + 1,2)
            self.item(row,column).setText(str(new_text))          

        elif event.button() == QtCore.RightButton:
            print('right') #FOR DEBUGGING
            row = self.currentRow()
            column = self.currentColumn()
            new_text = round(float(self.item(row,column).text()) - 1,2)
            self.item(row,column).setText(str(new_text)) 

对于eventFilter:

class Table(QtWidgets.QTableWidget):
    def __init__(self,parent=None):
        QtWidgets.QTableWidget.__init__(self,parent)
        self.installEventFilter(self)

    def eventFilter(self,QObject,event):
        if event.type() == QtCore.QEvent.MouseButtonPress:
            if event.button() == QtCore.LeftButton:
                print('left') #FOR DEBUGGING
                row = self.currentRow()
                column = self.currentColumn()
                new_text = round(float(self.item(row,column).text()) + 1,2)
                self.item(row,column).setText(str(new_text))          

            elif event.button() == QtCore.RightButton:
                print('right') #FOR DEBUGGING
                row = self.currentRow()
                column = self.currentColumn()
                new_text = round(float(self.item(row,column).text()) - 1,2)
                self.item(row,column).setText(str(new_text))

两者(创建表格)

class MainWindow(QtWidgets.QMainWindow):
    def __init__(self, parent=None):
        self.centralwidget = QtWidgets.QWidget(self)
        ....
        self.parameters = Table(self.centralwidget)
        ...
...

调试文本(打印“左”或“右”)也不会出现在控制台中。

2 个答案:

答案 0 :(得分:2)

当你覆盖一个方法时,它总是调用父方法,因为它可以做其他类型的任务,你会省略它。另一方面,如果我们这样做,代表将被激活以编辑文本,这是不想要的,所以我们建立一个新的代表,没有发布者返回,如下所示:

import sys
from PyQt5 import QtWidgets, QtGui, QtCore

class ReadOnlyDelegate(QtWidgets.QStyledItemDelegate):
    def createEditor(self, *args, **kwargs):
        return

class Table(QtWidgets.QTableWidget):
    def __init__(self, *args, **kwargs):
        QtWidgets.QTableWidget.__init__(self, *args, **kwargs)
        self.setItemDelegate(ReadOnlyDelegate(self))

    def mousePressEvent(self, event):
        if event.button() == QtCore.Qt.LeftButton:
            it = self.itemAt(event.pos())
            new_text = round(float(it.text()) + 1,2)
            it.setText(str(new_text))          

        elif event.button() == QtCore.Qt.RightButton:
            it = self.itemAt(event.pos())
            new_text = round(float(it.text()) - 1,2)
            it.setText(str(new_text))     
        QtWidgets.QTableWidget.mousePressEvent(self, event)

class MainWindow(QtWidgets.QMainWindow):
    def __init__(self, parent=None):
        QtWidgets.QMainWindow.__init__(self, parent)

        table = Table(5, 5)
        self.setCentralWidget(table)
        for i in range(5):
            for j in range(5):
                item = QtWidgets.QTableWidgetItem("{}".format(i*j))
                table.setItem(i, j, item)

if __name__=='__main__':
    import sys
    app = QtWidgets.QApplication(sys.argv)
    window = MainWindow()
    window.show()
    sys.exit(app.exec())

答案 1 :(得分:1)

试一试:

class Table(QtWidgets.QTableWidget):
    def mousePressEvent(self, event):
        if event.button() == QtCore.Qt.LeftButton:
            print('left')                 # FOR DEBUGGING
            row = self.currentRow()
            column = self.currentColumn()
            new_text = round(float(self.item(row,column).text()) + 1,2)
            self.item(row,column).setText(str(new_text))          

        elif event.button() == QtCore.Qt.RightButton:
            print('right')                 # FOR DEBUGGING
            row = self.currentRow()
            column = self.currentColumn()
            new_text = round(float(self.item(row,column).text()) - 1,2)
            self.item(row,column).setText(str(new_text))