Qt QListWidget右键弹出删除菜单

在QListWidget上右击鼠标弹出删除菜单

第一步，建立一个包含两条数据的QListWidget

1     /*初始化一个包含两个Action(Delete和ClearAll)的菜单*/
2     popMenu_In_ListWidget_ = new QMenu(this); 3     action_Delete_In_ListWidget_ = new QAction(tr("Delete"), this); 4     action_Clear_In_ListWidget_ = new QAction(tr("ClearAll"), this); 5     popMenu_In_ListWidget_->addAction(action_Delete_In_ListWidget_); 6     popMenu_In_ListWidget_->addAction(action_Clear_In_ListWidget_);

第二步，设置QListWidget的contextMenuPolicy属性，否则不能显示右键菜单

1     /*重要：设置QListWidget的contextMenuPolicy属性，否则不能显示右键菜单*/
2     list_widget->setProperty("contextMenuPolicy", Qt::CustomContextMenu);

第二步，建立一个包含QAction的QMenu菜单

1     /*初始化一个包含两个Action(Delete和ClearAll)的菜单*/
2     popMenu_In_ListWidget_ = new QMenu(this); 3     action_Delete_In_ListWidget_ = new QAction(tr("Delete"), this); 4     action_Clear_In_ListWidget_ = new QAction(tr("ClearAll"), this); 5     popMenu_In_ListWidget_->addAction(action_Delete_In_ListWidget_); 6     popMenu_In_ListWidget_->addAction(action_Clear_In_ListWidget_);

第三步，为菜单的上的QAction添加响应函数

 1 //事件处理函数
 2 void Dialog::onActionDelete()  3 {  4     /*获取当前选中的Item*/
 5     QList<QListWidgetItem*> items = this->list_widget->selectedItems();  6 
 7     if (items.count() > 0)  8  {  9         /*弹出询问对话框*/
10         if (QMessageBox::Yes == QMessageBox::question(this, QStringLiteral("Remove Item"), 11             QStringLiteral("Remove %1 item").arg(QString::number(items.count())), QMessageBox::Yes | QMessageBox::No, QMessageBox::Yes)) 12  { 13             foreach(QListWidgetItem* var, items) { 14                 this->list_widget->removeItemWidget(var); 15                 items.removeOne(var); 16                 delete var; 17  } 18  } 19  } 20 }

1 //绑定处理函数
2 /*为菜单上的Delete选项添加响应函数*/
3 connect(this->action_Delete_In_ListWidget_, SIGNAL(triggered()), this, SLOT(onActionDelete()));

第四步，为QListWidget添加右键弹出菜单函数

1 //事件处理函数
2 void Dialog::onCustomContextMenuRequested(const QPoint &pos) 3 { 4     /*弹出右键菜单*/
5     popMenu_In_ListWidget_->exec(QCursor::pos()); 6 }

1 //绑定处理函数
2 /*绑定右键显示菜单：在单击右键以后会执行槽函数， 槽函数中负责弹出右键菜单*/
3 connect(this->list_widget, SIGNAL(customContextMenuRequested(const QPoint &)), 4     this, SLOT(onCustomContextMenuRequested(const QPoint &)));

效果

鼠标右键点击，弹出菜单

点击Delete弹出是否删除对话框

代码示例

main_dialog.h

 1 #include <QDialog>
 2 
 3 class QMenu;  4 class QListWidget;  5 
 6 class Dialog : public QDialog  7 {  8  Q_OBJECT  9 
10 public: 11     Dialog(QWidget* parent = NULL); 12     ~Dialog(); 13 
14     private slots: 15 
16     /*处理鼠标右键事件，弹出菜单*/
17     void onCustomContextMenuRequested(const QPoint &pos); 18 
19     /*处理弹出菜单上的Delete事件*/
20     void onActionDelete(); 21 
22 private: 23 
24     QMenu *popMenu_In_ListWidget_;/*弹出菜单*/
25     QAction *action_Delete_In_ListWidget_;/*菜单上的Action*/
26     QAction *action_Clear_In_ListWidget_;/*菜单上的Action*/
27     QListWidget *list_widget;/*列表*/
28 
29 };

main.cpp

 1 #include <QtWidgets/QApplication>
 2 #include <QListWidget>
 3 #include <QMenu>
 4 #include <QMessageBox>
 5 
 6 #include "main_dialog.h"
 7 
 8 Dialog::Dialog(QWidget *parent) :QDialog(parent)  9 { 10     /*设置对话框大小*/
11     this->setFixedSize(500, 400); 12 
13     /*在对话框上添加一个QListWidget控件*/
14     list_widget = new QListWidget(this); 15     list_widget->setSelectionMode(QAbstractItemView::ContiguousSelection);/*设置能够多选*/
16 
17     /*在QListWidget控件上添加两个Item*/
18     list_widget->addItem("this is 1th item"); 19     list_widget->addItem("this is 2th item"); 20 
21     /*重要：设置QListWidget的contextMenuPolicy属性，否则不能显示右键菜单*/
22     list_widget->setProperty("contextMenuPolicy", Qt::CustomContextMenu); 23 
24     /*初始化一个包含两个Action(Delete和ClearAll)的菜单*/
25     popMenu_In_ListWidget_ = new QMenu(this); 26     action_Delete_In_ListWidget_ = new QAction(tr("Delete"), this); 27     action_Clear_In_ListWidget_ = new QAction(tr("ClearAll"), this); 28     popMenu_In_ListWidget_->addAction(action_Delete_In_ListWidget_); 29     popMenu_In_ListWidget_->addAction(action_Clear_In_ListWidget_); 30 
31     /*为菜单上的Delete选项添加响应函数*/
32     connect(this->action_Delete_In_ListWidget_, SIGNAL(triggered()), this, SLOT(onActionDelete())); 33 
34     /*绑定右键显示菜单：在单击右键以后会执行槽函数， 槽函数中负责弹出右键菜单*/
35     connect(this->list_widget, SIGNAL(customContextMenuRequested(const QPoint &)), 36         this, SLOT(onCustomContextMenuRequested(const QPoint &))); 37 
38 } 39 Dialog::~Dialog() 40 { 41 
42 } 43 
44 void Dialog::onCustomContextMenuRequested(const QPoint &pos) 45 { 46     /*弹出右键菜单*/
47     popMenu_In_ListWidget_->exec(QCursor::pos()); 48 } 49 
50 void Dialog::onActionDelete() 51 { 52     /*获取当前选中的Item*/
53     QList<QListWidgetItem*> items = this->list_widget->selectedItems(); 54 
55     if (items.count() > 0) 56  { 57         /*弹出询问对话框*/
58         if (QMessageBox::Yes == QMessageBox::question(this, QStringLiteral("Remove Item"), 59             QStringLiteral("Remove %1 item").arg(QString::number(items.count())), QMessageBox::Yes | QMessageBox::No, QMessageBox::Yes)) 60  { 61             foreach(QListWidgetItem* var, items) { 62                 this->list_widget->removeItemWidget(var); 63                 items.removeOne(var); 64                 delete var; 65  } 66  } 67  } 68 } 69 
70 int main(int argc, char *argv[]) 71 { 72  QApplication app(argc, argv); 73  Dialog dia; 74  dia.show(); 75     return app.exec(); 76 }

CMakeLists

 1 cmake_minimum_required (VERSION 2.6 FATAL_ERROR)  2 
 3 project(QListWidget_Menu)  4 find_package (Qt5 REQUIRED Core Widgets)  5 
 6 set (QT_UI_HEADERS main_dialog.h)  7 QT5_WRAP_CPP (project_HEADERS_MOC ${QT_UI_HEADERS})  8 
 9 file(GLOB Demo_Src ./*.cpp) 10 set (project_SOURCES ${Demo_Src}) 11 
12 file(GLOB Demo_Header ./*.h) 13 set (INCLUDE_FILE ${Demo_Header} ) 14 
15 set (project_HEADERS ${INCLUDE_FILE} ${QT_UI_HEADERS}) 16 
17 ADD_DEFINITIONS (${QT_DEFINITIONS}) 18 ADD_DEFINITIONS(-D _XKEYCHECK_H) 19 ADD_EXECUTABLE (Demo ${project_SOURCES} ${project_HEADERS_MOC} ${project_HEADERS}) 20 
21 set_property(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR} PROPERTY VS_STARTUP_PROJECT Demo) 22 
23 TARGET_LINK_LIBRARIES (Demo Qt5::Core Qt5::Widgets)