一、效果预览
二、编写目标
- 本文是在QTreeWidget的item上进行右键弹出右键菜单的使用示例。右键菜单支持多级子菜单。
- 建立多级右键菜单的数据结构和多级子菜单的动态生成方法。
- 多级QAction指向一个响应函数，在函数里区别是那个QAction被选中。并从数据结构取出对应的值。
三、源代码
本例子的代码很少，因此把代码直接附录到这里，同时提供了scdn的资源下载，资源里面包括了同样的一份代码。如果有积分直接下载会比较方便一点，避免从这里复制粘贴。
csdn资源地址为：
https://download.csdn.net/download/robert_cysy/12004955
以下为源代码：
deviceextrainfo.h
#ifndef DEVICEEXTRAINFO_H
#define DEVICEEXTRAINFO_H
#include <QList>
#include <QString>
class DeviceExtraInfo
{
public:
DeviceExtraInfo();
static QList<QString> GetChipManufacturerTypeNameList();
static QList<QString> GetLedChipTypeNameList(int manufacturer_type);
static QList<QString> GetLedColorTypeNameList();
private:
const static QList<QList<QString>> chip_type_name_array_;
const static QList<QString> chip_manufacturer_type_name_array_;
const static QList<QString> led_color_type_name_array_;
};
#endif // DEVICEEXTRAINFO_H
deviceextrainfo.cpp
#include "deviceextrainfo.h"
const QList<QString> DeviceExtraInfo::chip_manufacturer_type_name_array_= {"child1", "child2", "child3", "child4"};
const QList<QList<QString>> DeviceExtraInfo::chip_type_name_array_ = {
{"grandchild1"},
{"grandchild2", "grandchild3", "grandchild4"},
{"grandchild5", "grandchild6"},
{"grandchild7", "grandchild8"}
};
const QList<QString> DeviceExtraInfo::led_color_type_name_array_ = {"Red", "Green", "Blue"};
DeviceExtraInfo::DeviceExtraInfo()
{
}
QList<QString> DeviceExtraInfo::GetLedChipTypeNameList(int manufacturer_type) {
return chip_type_name_array_.at(manufacturer_type);
}
QList<QString> DeviceExtraInfo::GetChipManufacturerTypeNameList() {
return chip_manufacturer_type_name_array_;
}
QList<QString> DeviceExtraInfo::GetLedColorTypeNameList() {
return led_color_type_name_array_;
}
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QVBoxLayout>
#include <QTreeWidget>
#include <QMenu>
#include <QList>
#include <QAction>
QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
MainWindow(QWidget *parent = nullptr);
~MainWindow();
private:
void onItemPressed(QTreeWidgetItem *item, int column);
void InitMenu();
void onMenuActionTriggered_ChipType(QAction *action);
void onMenuActionTriggered_ChipColorType(QAction *action);
private:
Ui::MainWindow *ui;
QMenu *main_menu_p;
QList<QAction *> first_menu_action_list_;
QList<QAction *> chip_manufacture_action_list_;
QList<QList<QAction *>> chip_type_action_list_;
QList<QAction *> chip_color_type_action_list_;
};
#endif // MAINWINDOW_H
mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QDebug>
#include "deviceextrainfo.h"
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
, ui(new Ui::MainWindow)
{
ui->setupUi(this);
this->resize(400, 400);
InitMenu();
QVBoxLayout *main_v_layout;
main_v_layout = new QVBoxLayout(ui->centralwidget);
QTreeWidget *tree_widget;
tree_widget = new QTreeWidget(ui->centralwidget);
tree_widget->setHeaderLabel("header title");
connect(tree_widget, &QTreeWidget::itemPressed, this, &MainWindow::onItemPressed);
main_v_layout->addWidget(tree_widget);
QTreeWidgetItem* group1 = new QTreeWidgetItem(tree_widget);//this pointer is the list to add this item
group1->setText(0, "haha1");
group1->setFlags(Qt::ItemIsUserCheckable | Qt::ItemIsEnabled | Qt::ItemIsSelectable);
group1->setCheckState(0,Qt::Unchecked);
QTreeWidgetItem* group2 = new QTreeWidgetItem(tree_widget);//this pointer is the list to add this item
group2->setText(0, "haha2");
group2->setFlags(Qt::ItemIsUserCheckable | Qt::ItemIsEnabled | Qt::ItemIsSelectable);
group2->setCheckState(0,Qt::Unchecked);
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::onItemPressed(QTreeWidgetItem *item, int column) {
Q_UNUSED(column)
if (!(QGuiApplication::mouseButtons() & Qt::RightButton)) return;
main_menu_p->exec(QCursor::pos());
}
void MainWindow::InitMenu() {
main_menu_p = new QMenu(this);
QAction *chip_type_main_action = new QAction(main_menu_p);
chip_type_main_action->setText(QApplication::translate("MainWindow", "Father"));
first_menu_action_list_.append(chip_type_main_action);
QAction *chip_color_type_main_action = new QAction(main_menu_p);
chip_color_type_main_action->setText(QApplication::translate("MainWindow", "Color"));
first_menu_action_list_.append(chip_color_type_main_action);
main_menu_p->addActions(first_menu_action_list_);
//ic type child menu
QMenu *child_ic_type_menu = new QMenu();
QList<QString> chip_manufacture_type_list = DeviceExtraInfo::GetChipManufacturerTypeNameList();
for (int a = 0; a < chip_manufacture_type_list.count(); a ++) {
QString name = chip_manufacture_type_list.at(a);
QAction *action = new QAction();
action->setText(name);
//chip child child menu
QList<QAction*> temp_chip_type_list;
QList<QString> child_child_chip_type_name_list = DeviceExtraInfo::GetLedChipTypeNameList(a);
QMenu *child_child_chip_type_menu = new QMenu();
for (int b = 0; b < child_child_chip_type_name_list.count(); b ++) {
QString chip_name = child_child_chip_type_name_list.at(b);
QAction *chip_action = new QAction();
chip_action->setText(chip_name);
temp_chip_type_list.append(chip_action);
}
connect(child_child_chip_type_menu, &QMenu::triggered, this, &MainWindow::onMenuActionTriggered_ChipType);
child_child_chip_type_menu->addActions(temp_chip_type_list);
action->setMenu(child_child_chip_type_menu);
child_ic_type_menu->addMenu(child_child_chip_type_menu);
chip_type_action_list_.append(temp_chip_type_list);
chip_manufacture_action_list_.append(action);
}
child_ic_type_menu->addActions(chip_manufacture_action_list_);
chip_type_main_action->setMenu(child_ic_type_menu);
main_menu_p->addMenu(child_ic_type_menu);
//chip color type
QMenu *child_color_type_menu = new QMenu();
QList<QString> chip_color_type_list = DeviceExtraInfo::GetLedColorTypeNameList();
for (int a = 0; a < chip_color_type_list.count(); a ++) {
QString name = chip_color_type_list.at(a);
QAction *action = new QAction();
action->setText(name);
chip_color_type_action_list_.append(action);
}
connect(child_color_type_menu, &QMenu::triggered, this, &MainWindow::onMenuActionTriggered_ChipColorType);
child_color_type_menu->addActions(chip_color_type_action_list_);
chip_color_type_main_action->setMenu(child_color_type_menu);
main_menu_p->addMenu(child_color_type_menu);
}
void MainWindow::onMenuActionTriggered_ChipType(QAction *action) {
qDebug() << "ChipType";
for (int a = 0; a < chip_type_action_list_.count(); a ++) {
QList<QAction *> action_list = chip_type_action_list_.at(a);
for (int b = 0; b < action_list.count(); b ++) {
QAction* action_src = action_list.at(b);
if(action_src == action) {
qDebug() << "index a = " << a << " index b = " << b;
QList<QString> chip_manufacture_type_list = DeviceExtraInfo::GetChipManufacturerTypeNameList();
QList<QString> child_child_chip_type_name_list = DeviceExtraInfo::GetLedChipTypeNameList(a);
QString child_name = chip_manufacture_type_list.at(a);
QString grand_child_name = child_child_chip_type_name_list.at(b);
qDebug() << "child:" << child_name << " grand_child:" << grand_child_name;
return;
}
}
}
}
void MainWindow::onMenuActionTriggered_ChipColorType(QAction *action) {
qDebug() << "ChipColorType";
for (int a = 0; a < chip_color_type_action_list_.count(); a ++) {
QAction *action_src = chip_color_type_action_list_.at(a);
if(action_src == action) {
qDebug() << "index a = " << a;
QList<QString> chip_color_type_list = DeviceExtraInfo::GetLedColorTypeNameList();
QString color_name = chip_color_type_list.at(a);
qDebug() << "color :" << color_name;
return;
}
}
}
main.cpp
#include "mainwindow.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}
