Qt 自定义菜单、右键菜单

在接触Qt这段时间以来，经常遇到菜单项的问题（右键菜单、托盘菜单、按钮菜单等），QMenu用于菜单栏,上下文菜单,弹出菜单等，利用QMenu+QAction就可以达到效果！

右键菜单实现：通过重写contextMenuEvent(QContextMenuEvent *event)事件，QMenu+QAction即可完美实现！

对象：QTreeWidget

实现方式：createActions用于创建菜单、菜单项，contextMenuEvent用于实现菜单的显示，translateLanguage用于实现菜单的文本（此方法主要设置多语化使用）

cpp 复制代码

void ImageTree::createActions()
{
    //创建菜单、菜单项
    pop_menu = new QMenu();
    add_images_action = new QAction(this); 
    add_folder_action = new QAction(this);
    remove_selected_action = new QAction(this);
    remove_all_action = new QAction(this);

    //连接信号与槽
    connect(add_images_action, &QAction::triggered, this, &ImageTree::selectImages);
    connect(add_folder_action, &QAction::triggered, this, &ImageTree::selectFolder);
   connect(remove_selected_action, &QAction::triggered, this, &ImageTree::removeSelectedImages);
    connect(remove_all_action, &QAction::triggered, this, &ImageTree::removeAllImages);
}

void ImageTree::contextMenuEvent(QContextMenuEvent *event)
{
    //清除原有菜单
    pop_menu->clear();
   pop_menu->addAction(add_images_action);
   pop_menu->addAction(add_folder_action);
   pop_menu->addAction(remove_selected_action);
   pop_menu->addAction(remove_all_action);

    //菜单出现的位置为当前鼠标的位置
   pop_menu->exec(QCursor::pos());
    event->accept();
}

void ImageTree::translateLanguage()
{
   add_images_action->setText(tr("add images"));
   add_folder_action->setText(tr("add folder"));
   remove_selected_action->setText(tr("remove selected images"));
   remove_all_action->setText(tr("remove all images"));
}

二级菜单的实现（包括三级菜单或者更多）也类似，只需要使用QMenu的addMenu()方法即可！