Qt 实现系统托盘，托盘菜单，托盘消息

Qter · 发表于 2018-4-7 21:11:22

https://blog.csdn.net/u011417605/article/details/51322997
Qt 实现系统托盘，托盘菜单，托盘消息          系统托盘就是运行的某个程序在电脑右下角的小图标，相信大家都很熟悉。QT 提供了QSystemTrayIcon类用于实现程序的托盘。QT提供了托盘示例，在examples文件夹下面，大家可以自行研究。
   下面是我自己进行实现的一个示例，主要实现的功能：
      1.托盘显示，托盘图标添加；
      2.托盘激活事件分发；

      3.托盘菜单；

      4.托盘消息，点击消息，显示主窗口。

      想要显示托盘图标，首先需要创建一个QSystemTrayIcon对象。可以给此对象设置一些信息，比如ToolTip，比如图标。需要调用show，托盘才能显示。
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m_systemTray = new QSystemTrayIcon(this);
m_systemTray->setIcon(QIcon(":/SystemTray/Resources/ico.png"));
m_systemTray->setToolTip("SystemTray Program");
m_systemTray->show();

给程序添加图片资源，需要编辑.qrc文件，将图片所在的路径添加进来就可以：
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<RCC>
<qresource prefix="SystemTray">
<file>Resources/ico.png</file>
</qresource>
</RCC>

效果显示：

托盘激活事件，包括点击，双击，右键等。QSystemTrayIcon提供了信号给我们使用，信号的参数是激活类型，我们连接自己的槽函数就可以对类型进行分支，从而执行对应的操作：
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Constant Value Description
QSystemTrayIcon::Unknown 0 Unknown reason
QSystemTrayIcon::Context 1 The context menu for the system tray entry was requested
QSystemTrayIcon:oubleClick 2 The system tray entry was double clicked
QSystemTrayIcon::Trigger 3 The system tray entry was clicked
QSystemTrayIcon::MiddleClick 4 The system tray entry was clicked with the middle mouse button

连接我们自己的槽函数：
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connect(m_systemTray, &QSystemTrayIcon::activated, this, &SystemTray::activeTray);//点击托盘，执行相应的动作

在槽函数中，分别调用了不同的函数，进行不同的操作：
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void SystemTray::activeTray(QSystemTrayIcon::ActivationReason reason)
{
switch (reason)
{
case QSystemTrayIcon::Context:
showMenu();
break;
case QSystemTrayIcon:oubleClick:
showWindow();
break;
case QSystemTrayIcon::Trigger:
showMessage();
break;
}
}

要实现菜单，我们需要创建一个QMenu并创建自己需要的QAction，添加到QMenu里面，将QMenu设置给QSystemTrayIcon既可。我们可以给每个QAction连接不同的槽函数，执行不同的操作。
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m_menu = new QMenu(this);
m_action1 = new QAction(m_menu);
m_action2 = new QAction(m_menu);
m_action1->setText("Show Window");
m_action2->setText("Show Message");
m_menu->addAction(m_action1);
m_menu->addAction(m_action2);
connect(m_action1, &QAction::triggered, this, &SystemTray::showWindow);
connect(m_action2, &QAction::triggered, this, &SystemTray::showMessage);
m_systemTray->setContextMenu(m_menu);

菜单效果：

消息显示也很简单，QSystemTrayIcon提供了showMessage函数来显示消息窗口，此函数有四个参数，分别如下：
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void SystemTray::showMessage()
{
m_systemTray->showMessage("Information",//消息窗口标题
"There is a new message!",//消息内容
QSystemTrayIcon::MessageIcon::Information,//消息窗口图标
5000);//消息窗口显示时长
}

消息效果：

QSystemTrayIcon提供了messageClicked信号，点击消息，可以触发我们自己连接的槽函数，执行我们想要实现的动作：
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connect(m_systemTray, &QSystemTrayIcon::messageClicked, this, &SystemTray::showWindow);//点击消息框，显示主窗口

主窗口显示：

程序一开始主界面是隐藏的，双击托盘可以显示主窗口。
完整代码：
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#ifndef SYSTEMTRAY_H
#define SYSTEMTRAY_H
#include <QtWidgets/QWidget>
#include <QSystemTrayIcon>
#include <QMenu>
class SystemTray : public QWidget
{
Q_OBJECT
public:
SystemTray(QWidget *parent = 0);
~SystemTray();
protected:
void activeTray(QSystemTrayIcon::ActivationReason reason);
void showWindow();//显示窗体
void showMessage();//消息框
void showMenu();//显示菜单
private:
QSystemTrayIcon *m_systemTray;
QMenu *m_menu;
QAction *m_action1;
QAction *m_action2;
};
#endif // SYSTEMTRAY_H

[cpp] view plain copy

#include "systemtray.h"
SystemTray::SystemTray(QWidget *parent)
: QWidget(parent)
{
m_systemTray = new QSystemTrayIcon(this);
m_menu = new QMenu(this);
m_action1 = new QAction(m_menu);
m_action2 = new QAction(m_menu);
m_action1->setText("Show Window");
m_action2->setText("Show Message");
m_menu->addAction(m_action1);
m_menu->addAction(m_action2);
connect(m_action1, &QAction::triggered, this, &SystemTray::showWindow);
connect(m_action2, &QAction::triggered, this, &SystemTray::showMessage);
m_systemTray->setContextMenu(m_menu);
m_systemTray->setIcon(QIcon(":/SystemTray/Resources/ico.png"));
m_systemTray->setToolTip("SystemTray Program");
m_systemTray->show();
connect(m_systemTray, &QSystemTrayIcon::activated, this, &SystemTray::activeTray);//点击托盘，执行相应的动作
connect(m_systemTray, &QSystemTrayIcon::messageClicked, this, &SystemTray::showWindow);//点击消息框，显示主窗口
}
SystemTray::~SystemTray()
{
}
void SystemTray::activeTray(QSystemTrayIcon::ActivationReason reason)
{
switch (reason)
{
case QSystemTrayIcon::Context:
showMenu();
break;
case QSystemTrayIcon:oubleClick:
showWindow();
break;
case QSystemTrayIcon::Trigger:
showMessage();
break;
}
}
void SystemTray::showMenu()
{
m_menu->show();
}
void SystemTray::showWindow()
{
this->show();
}
void SystemTray::showMessage()
{
m_systemTray->showMessage("Information",//消息窗口标题
"There is a new message!",//消息内容
QSystemTrayIcon::MessageIcon::Information,//消息窗口图标
5000);//消息窗口显示时长
}

[cpp] view plain copy

#include "systemtray.h"
#include <QtWidgets/QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
SystemTray w;
//w.show();
w.hide();//初始化时，主窗口隐藏，便于观察效果
return a.exec();
}

[cpp] view plain copy

<RCC>
<qresource prefix="SystemTray">
<file>Resources/ico.png</file>
</qresource>
</RCC>

Qter · 发表于 2018-4-7 21:47:09

窗口置顶

#ifdef Q_OS_WIN32
#include <windows.h>
#endif
void MainWindow::showWindow()
{
if (this->isMinimized())
{
// this->showNormal();
this->showMaximized();
}
#ifdef Q_OS_WIN32
// SetWindowPos((HWND)winId(),HWND_TOPMOST,pos().x(),pos().y(),width(),height(),SWP_SHOWWINDOW);
//设置窗口置顶
SetWindowPos(HWND(this->winId()), HWND_TOPMOST, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE | SWP_SHOWWINDOW);
SetWindowPos(HWND(this->winId()), HWND_NOTOPMOST, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE | SWP_SHOWWINDOW);
#else
Qt::WindowFlags flags = windowFlags();
flags |= Qt::WindowStaysOnTopHint;
setWindowFlags(flags);
#endif
this->show();
this->activateWindow();
}

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