在 QTreeWidget 中调用上下文菜单

发布于 2024-08-11 22:30:45 字数 136 浏览 5 评论 0原文

当用户单击 QTreeWidgetItem 中的对象时，我想弹出一个菜单。我想从 QWidget 捕获信号 contextMenuRequested ，然后使用 itemAt 从视图中检索索引。但这看起来不太漂亮。有没有更简单的方法可以调用视图内项目的菜单？

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你是年少的欢喜 2024-08-18 22:30:45

编写您自己的自定义 ItemDelegate 并在 QAbstractItemDelegate::editorEvent 中处理点击事件。
您可以从 QModelIndex 检索单元格中的数据。
在 C++ 中，它看起来像这样：

class ItemDelegate: public QItemDelegate
{
public:
    ItemDelegate(ContextMenuHandler *const contextMenu, QObject *const parent )
        : QItemDelegate(parent)
        , m_contexMenu(contextMenu) 
    {
    }

    bool editorEvent( 
            QEvent * event, 
            QAbstractItemModel * model, 
            const QStyleOptionViewItem & option, 
            const QModelIndex & index )
    {
        if((event->type()==QEvent::MouseButtonPress) && index.isValid())
        {
            QMouseEvent *const mouseEvent = qobject_cast<QMouseEvent>(event);
            if(mouseEvent && (mouseEvent->button()==Qt::RightButton))
            {
                return m_contexMenu->showContextMenu(mouseEvent->pos(), index);
            }
        }
    }
    ContextMenuHandler *const m_contextMenu;
};

treeWidget->setItemDelegate(new ItemDelegate(contextMenuHandler,treeWidget));

Write your own custom ItemDelegate and handle the click event in QAbstractItemDelegate::editorEvent.
You can retreive the data in the cell from the QModelIndex.
In C++ it would look like this:

class ItemDelegate: public QItemDelegate
{
public:
    ItemDelegate(ContextMenuHandler *const contextMenu, QObject *const parent )
        : QItemDelegate(parent)
        , m_contexMenu(contextMenu) 
    {
    }

    bool editorEvent( 
            QEvent * event, 
            QAbstractItemModel * model, 
            const QStyleOptionViewItem & option, 
            const QModelIndex & index )
    {
        if((event->type()==QEvent::MouseButtonPress) && index.isValid())
        {
            QMouseEvent *const mouseEvent = qobject_cast<QMouseEvent>(event);
            if(mouseEvent && (mouseEvent->button()==Qt::RightButton))
            {
                return m_contexMenu->showContextMenu(mouseEvent->pos(), index);
            }
        }
    }
    ContextMenuHandler *const m_contextMenu;
};

treeWidget->setItemDelegate(new ItemDelegate(contextMenuHandler,treeWidget));

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彼岸花ソ最美的依靠 2024-08-18 22:30:45

我正在使用这样的东西：

self.widget_layers.setContextMenuPolicy(Qt.ActionsContextMenu)
removeLayerAction = QAction("Remove selected layer", self)
self.connect(removeLayerAction, SIGNAL('triggered()'), self.layers_widget_controller.remove_selected_layer)

并检查哪个项目触发了信号：

selected_item = self.main_window.widget_layers.selectedItems()[0]

I'm using something like this:

self.widget_layers.setContextMenuPolicy(Qt.ActionsContextMenu)
removeLayerAction = QAction("Remove selected layer", self)
self.connect(removeLayerAction, SIGNAL('triggered()'), self.layers_widget_controller.remove_selected_layer)

and check which item triggered the signal by:

selected_item = self.main_window.widget_layers.selectedItems()[0]

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七婞 2024-08-18 22:30:45

我对新信号/槽样式所做的操作：

self.treeMenu = QMenu()
self.treeAction = QAction('print', self.treeMenu)
self.treeAction.triggered.connect(self.printTreeItem)
self.treeWidget.addAction(self.treeAction)

@pyqtSlot()    
def printTreeItem(self):
    print self.treeWidget.currentItem().text(0)

当您在树形小部件中右键单击时，这将打开一个菜单。如果您单击“打印”，在控制台中它将打印出具有当前焦点的项目，即您右键单击的项目。

注意：当前项不一定是所选项，所选项是您最近单击的项。

What I did with the new signal/slot style:

self.treeMenu = QMenu()
self.treeAction = QAction('print', self.treeMenu)
self.treeAction.triggered.connect(self.printTreeItem)
self.treeWidget.addAction(self.treeAction)

@pyqtSlot()    
def printTreeItem(self):
    print self.treeWidget.currentItem().text(0)

This will open a menu when you right-click within the your treeWidget. And if you click the 'print', in your console it will print out the item which has the current focus, it's the one that you right-clicked.

Note: the current item is not necessary the selected item, the selected item is the one you most recently clicked.

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