ljn's 学习笔记
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desktop_pet_cat

发表于

learned

  • 重载QPaintEvent::paintEvent, 使之能够加载图片
  • snprintf基于printf处理字符串，QString中.arg()可以模拟，注意参数是%num;
  • connect调用的函数必须加&
  • Qpixmap::scale()用于调整大小
  • Widget::update直接更新窗口
  • 透明窗口、透明背景、与移动
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this->setWindowFlag(Qt::FramelessWindowHint);     // 去除窗口边框
    this->setAttribute(Qt::WA_TranslucentBackground); // 背景透明
    this->installEventFilter(new DragFilter);
  • 最小化系统图标的使用
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QSystemTrayIcon sysTray(QIcon(":/pic/image/icon.png"),&w);
    QMenu menu;
    auto showAct=new QAction("show",&sysTray);
    auto exitAct=new QAction("exit",&sysTray);
    QObject::connect(showAct,&QAction::triggered,&w,[&](){
        w.setVisible(true);
    });
    QObject::connect(exitAct,&QAction::triggered,&a,[&](){
        QApplication::quit();
    });
    menu.addAction(showAct);
    menu.addAction(exitAct);

    sysTray.setContextMenu(&menu);

    sysTray.show();
  • widget::setVisible暂时关闭窗口
  • QUrl更安全的跨平台链接
  • Q_ENUM_NS(RoleAct)//注册枚举

new_learn

拖动窗口的内置函数实现

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if (w->windowHandle())
                {
                    w->windowHandle()->startSystemMove();
                    return true;
                }

code

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#include "widget.h"
#include <QPixmap>
#include <QDebug>
#include <Qcursor>
#include <QMetaEnum>
Widget::Widget(QWidget *parent)
    : QWidget(parent),
    timer(new QTimer(this)),//自动析构
    menu(new QMenu(this))
{
    this->setWindowFlag(Qt::FramelessWindowHint);//去除窗口边框
    this->setAttribute(Qt::WA_TranslucentBackground);//背景透明
    this->installEventFilter(new DragFilter);

    connect(timer,&QTimer::timeout,this,[this](){
        static int index=0;//记录显示动作的图片索引
        auto paths=this->action_map.value(this->cur_role_act);
        this->cur_role_pix=paths[index++%paths.size()];
        //paintEvent()会递归调用
        this->update();

    });
    loadRoleActRes();

    showActAnimation(RoleAct::SayHello);
    initMennu();
}

Widget::~Widget() {}

void Widget::showActAnimation(RoleAct k)
{
    timer->stop();
    this->cur_role_act=k;
    timer->start(500);

}

void Widget::onMenuTriggered(QAction *action)
{
    QMetaEnum me=QMetaEnum::fromType<RoleAct>();
    bool ok;
    int k=me.keyToValue(action->text().toStdString().c_str(),&ok);
    if(!ok)return;
    showActAnimation(static_cast<RoleAct>(k));
}

void Widget::paintEvent(QPaintEvent *event)
{
    QPainter painter(this);
    QPixmap pix;

    // qDebug()<<"pix path:"<<this->cur_role_pix.toLocalFile();
    pix.load(this->cur_role_pix.toLocalFile());
    int targetWidth = 200;  // 你想要的宽
    int targetHeight = 150; // 你想要的高
    pix = pix.scaled(targetWidth, targetHeight, Qt::KeepAspectRatio, Qt::SmoothTransformation);
    painter.drawPixmap(0,0,pix);

}

void Widget::contextMenuEvent(QContextMenuEvent *event)
{
    this->menu->popup(QCursor::pos());
}

void Widget::loadRoleActRes()
{
    auto addRes=[this](RoleAct k,QString path,int count)
    {
        QList<QUrl>paths;
        char buf[260];//path最长255
        for(int i=0;i<count;++i)
        {
            memset(buf,0,sizeof(buf));
            sprintf_s(buf,path.toStdString().c_str(),i);
            paths.append(QUrl::fromLocalFile(buf));
        }
        action_map.insert(k,paths);
        // qDebug()<<paths[1];

    };
    addRes(RoleAct::SayHello,":/pic/image/sayHello/sayHello%d.png",4);
    addRes(RoleAct::Sleep,":/%d.png",32);
    addRes(RoleAct::Swing,":/%d.png",11);


}

void Widget::initMennu()
{
    menu->addAction("SayHello");
    menu->addAction("Sleep");
    menu->addAction("Swing");

    QAction* act=new QAction("Hide");
    connect(act,&QAction::triggered,this,[this](){
        this->setVisible(false);
    });

    menu->addAction(act);
    connect(this->menu,&QMenu::triggered,this,Widget::onMenuTriggered);
}

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#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QPaintEvent>
#include <QPainter>
#include <QEvent>
#include <QMouseEvent>
#include <QContextMenuEvent>
#include <QMenu>

#include<QMap>
#include<QList>
#include<QUrl>
#include<QTimer>

namespace Act{
    Q_NAMESPACE
enum RoleAct{
        SayHello,
        Swing,
        Sleep,
    };
    Q_ENUM_NS(RoleAct)//注册枚举
}

    using namespace Act;
class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = nullptr);
    ~Widget();

public:
    void showActAnimation(RoleAct k);

public slots:
    void onMenuTriggered(QAction *action);


protected:
    void paintEvent(QPaintEvent *event)override;
    void contextMenuEvent(QContextMenuEvent*event)override;

private:
    void loadRoleActRes();
    void initMennu();

private:
    QMap<RoleAct,QList<QUrl>>action_map;
    QTimer* timer;
    RoleAct cur_role_act;
    QUrl cur_role_pix;
    QMenu* menu;
};

class DragFilter:public QObject{
public:
    bool eventFilter(QObject*obj,QEvent*event)
    {
        auto w=dynamic_cast<QWidget*>(obj);
        if(!w)
            return false;
        if(event->type()==QEvent::MouseButtonPress)
        {
            auto e =dynamic_cast<QMouseEvent*>(event);
            if(e)
            {
                pos=e->pos();
            }
        }
        else if(event->type()==QEvent::MouseMove)
        {
            auto e =dynamic_cast<QMouseEvent*>(event);
            if(e)
            {
                if(e->buttons()&Qt::MouseButton::LeftButton)
                {
                    w->move(e->globalPosition().toPoint()-pos);
                }
            }
        }
        return QObject::eventFilter(obj,event);

    }
private:
    QPoint pos;
};


#endif // WIDGET_H

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#include "widget.h"

#include <QApplication>
#include <QSystemTrayIcon>//系统菜单托盘

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;

    QSystemTrayIcon sysTray(QIcon(":/pic/image/icon.png"),&w);
    QMenu menu;
    auto showAct=new QAction("show",&sysTray);
    auto exitAct=new QAction("exit",&sysTray);
    QObject::connect(showAct,&QAction::triggered,[&](){
        w.setVisible(true);
    });
    QObject::connect(exitAct,&QAction::triggered,[&](){
        QApplication::quit();
    });

    menu.addAction(showAct);
    menu.addAction(exitAct);

    sysTray.setContextMenu(&menu);

    sysTray.show();

    w.show();
    return a.exec();
}