c++ qundogroup qtreewidget和qtablewidget支持撤销与恢复功能 代码
时间: 2024-02-20 15:02:09 浏览: 111
对于Qt中的QTreeWidget和QTableWidget,可以通过使用QUndoGroup来实现撤销和恢复功能。以下是一个简单的示例代码:
```
#include <QtWidgets>
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QUndoGroup undoGroup;
// 创建一个 QTreeWidget
QTreeWidget treeWidget;
// 创建一个 QTableWidget
QTableWidget tableWidget;
// 绑定 QUndoGroup 到 QTreeWidget
QUndoStack *treeUndoStack = new QUndoStack(&undoGroup);
treeWidget.setUndoStack(treeUndoStack);
// 绑定 QUndoGroup 到 QTableWidget
QUndoStack *tableUndoStack = new QUndoStack(&undoGroup);
tableWidget.setUndoStack(tableUndoStack);
// 添加一些测试数据
treeWidget.setHeaderLabels({"Name", "Value"});
QTreeWidgetItem *root = new QTreeWidgetItem(&treeWidget, {"Root"});
QTreeWidgetItem *child1 = new QTreeWidgetItem(root, {"Child 1", "1"});
QTreeWidgetItem *child2 = new QTreeWidgetItem(root, {"Child 2", "2"});
tableWidget.setColumnCount(2);
tableWidget.setRowCount(2);
tableWidget.setItem(0, 0, new QTableWidgetItem("Item 1"));
tableWidget.setItem(0, 1, new QTableWidgetItem("1"));
tableWidget.setItem(1, 0, new QTableWidgetItem("Item 2"));
tableWidget.setItem(1, 1, new QTableWidgetItem("2"));
// 创建一个撤销操作
QAction *undoAction = undoGroup.createUndoAction(&treeWidget, "Undo");
undoAction->setShortcut(QKeySequence::Undo);
QAction *tableUndoAction = undoGroup.createUndoAction(&tableWidget, "Undo");
tableUndoAction->setShortcut(QKeySequence::Undo);
// 创建一个重做操作
QAction *redoAction = undoGroup.createRedoAction(&treeWidget, "Redo");
redoAction->setShortcut(QKeySequence::Redo);
QAction *tableRedoAction = undoGroup.createRedoAction(&tableWidget, "Redo");
tableRedoAction->setShortcut(QKeySequence::Redo);
// 创建一个菜单
QMenu *editMenu = new QMenu("Edit");
editMenu->addAction(undoAction);
editMenu->addAction(tableUndoAction);
editMenu->addAction(redoAction);
editMenu->addAction(tableRedoAction);
// 创建一个窗口并显示
QMainWindow window;
window.setCentralWidget(&treeWidget);
window.setMenuBar(new QMenuBar);
window.menuBar()->addMenu(editMenu);
window.show();
return app.exec();
}
```
在上面的代码中,我们创建了一个QUndoGroup对象,并将其绑定到QTreeWidget和QTableWidget上的QUndoStack对象。然后,我们创建了一些测试数据,并创建了一个撤销和重做操作的菜单。最后,我们创建了一个窗口并将其显示出来。
当我们对QTreeWidget和QTableWidget进行更改时,这些更改将被添加到QUndoStack对象中。我们可以使用撤销和重做操作来撤销和恢复这些更改。
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