PyQt：可编辑标签标签

Question

我可以在内部重命名标签标签。

使用QInputDialog，我可以获取新标签并设置选项卡小部件标签。

但是，我希望有更多用户友好的解决方案，例如双击标签并自行编辑表单。

带有可编辑标志的listWidgetItem可以向我展示方法，但找不到标签标签的解决方案。

什么都可以帮助我：）

Answer 1

没有实现此目的的内置方法。

您将必须实现自己的标签栏并自己绘制标签编辑器，这显然不容易。

代替QInputDialog，您可以创建自己的简化对话框来编辑标签。它可能只是一个简单的弹出行编辑，没有按钮，没有标题栏，等等。

编辑

这是一个演示基本标签编辑的脚本：

PyQt5：

import sys
from PyQt5 import QtCore, QtWidgets

class TabBar(QtWidgets.QTabBar):
    def __init__(self, parent):
        super().__init__(parent)
        self._editor = QtWidgets.QLineEdit(self)
        self._editor.setWindowFlags(QtCore.Qt.Popup)
        self._editor.setFocusProxy(self)
        self._editor.editingFinished.connect(self.handleEditingFinished)
        self._editor.installEventFilter(self)

    def eventFilter(self, widget, event):
        if ((event.type() == QtCore.QEvent.MouseButtonPress and
             not self._editor.geometry().contains(event.globalPos())) or
            (event.type() == QtCore.QEvent.KeyPress and
             event.key() == QtCore.Qt.Key_Escape)):
            self._editor.hide()
            return True
        return super().eventFilter(widget, event)

    def mouseDoubleClickEvent(self, event):
        index = self.tabAt(event.pos())
        if index >= 0:
            self.editTab(index)

    def editTab(self, index):
        rect = self.tabRect(index)
        self._editor.setFixedSize(rect.size())
        self._editor.move(self.parent().mapToGlobal(rect.topLeft()))
        self._editor.setText(self.tabText(index))
        if not self._editor.isVisible():
            self._editor.show()

    def handleEditingFinished(self):
        index = self.currentIndex()
        if index >= 0:
            self._editor.hide()
            self.setTabText(index, self._editor.text())

class Window(QtWidgets.QTabWidget):
    def __init__(self):
        super().__init__()
        self.setTabBar(TabBar(self))
        self.addTab(QtWidgets.QWidget(self), 'Tab One')
        self.addTab(QtWidgets.QWidget(self), 'Tab Two')

if __name__ == '__main__':

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

PyQt4：

from PyQt4 import QtGui, QtCore

class TabBar(QtGui.QTabBar):
    def __init__(self, parent):
        QtGui.QTabBar.__init__(self, parent)
        self._editor = QtGui.QLineEdit(self)
        self._editor.setWindowFlags(QtCore.Qt.Popup)
        self._editor.setFocusProxy(self)
        self._editor.editingFinished.connect(self.handleEditingFinished)
        self._editor.installEventFilter(self)

    def eventFilter(self, widget, event):
        if ((event.type() == QtCore.QEvent.MouseButtonPress and
             not self._editor.geometry().contains(event.globalPos())) or
            (event.type() == QtCore.QEvent.KeyPress and
             event.key() == QtCore.Qt.Key_Escape)):
            self._editor.hide()
            return True
        return QtGui.QTabBar.eventFilter(self, widget, event)

    def mouseDoubleClickEvent(self, event):
        index = self.tabAt(event.pos())
        if index >= 0:
            self.editTab(index)

    def editTab(self, index):
        rect = self.tabRect(index)
        self._editor.setFixedSize(rect.size())
        self._editor.move(self.parent().mapToGlobal(rect.topLeft()))
        self._editor.setText(self.tabText(index))
        if not self._editor.isVisible():
            self._editor.show()

    def handleEditingFinished(self):
        index = self.currentIndex()
        if index >= 0:
            self._editor.hide()
            self.setTabText(index, self._editor.text())

class Window(QtGui.QTabWidget):
    def __init__(self):
        QtGui.QTabWidget.__init__(self)
        self.setTabBar(TabBar(self))
        self.addTab(QtGui.QWidget(self), 'Tab One')
        self.addTab(QtGui.QWidget(self), 'Tab Two')

if __name__ == '__main__':

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

Answer 2

更新为ekhumoro留下的答案：

在PyQt5中，代码现在看起来像这样：

from PyQt5.QtCore import Qt, QEvent
from PyQt5.QtWidgets import QTabBar, QTabWidget, QApplication, QLineEdit, QWidget

class EditableTabBar(QTabBar):
    def __init__(self, parent):
        QTabBar.__init__(self, parent)
        self._editor = QLineEdit(self)
        self._editor.setWindowFlags(Qt.Popup)
        self._editor.setFocusProxy(self)
        self._editor.editingFinished.connect(self.handleEditingFinished)
        self._editor.installEventFilter(self)

    def eventFilter(self, widget, event):
        if ((event.type() == QEvent.MouseButtonPress and not self._editor.geometry().contains(event.globalPos())) or (event.type() == QEvent.KeyPress and event.key() == Qt.Key_Escape)):
            self._editor.hide()
            return True
        return QTabBar.eventFilter(self, widget, event)

    def mouseDoubleClickEvent(self, event):
        index = self.tabAt(event.pos())
        if index >= 0:
            self.editTab(index)

    def editTab(self, index):
        rect = self.tabRect(index)
        self._editor.setFixedSize(rect.size())
        self._editor.move(self.parent().mapToGlobal(rect.topLeft()))
        self._editor.setText(self.tabText(index))
        if not self._editor.isVisible():
            self._editor.show()

    def handleEditingFinished(self):
        index = self.currentIndex()
        if index >= 0:
            self._editor.hide()
            self.setTabText(index, self._editor.text())

class Window(QTabWidget):
    def __init__(self):
        QTabWidget.__init__(self)
        self.setTabBar(EditableTabBar(self))
        self.addTab(QWidget(self), 'Tab One')
        self.addTab(QWidget(self), 'Tab Two')

if __name__ == '__main__':

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