Qt浅谈之右下角浮出界面

一、简介

       csdn博客上看到了一个比较简单的动画，类似windows下右下角的弹出广告界面。故记录在此，以便查阅。

二、详解

1、部分代码

（1）rightpop.h

#ifndef RIGHTPOP_H
#define RIGHTPOP_H

#include "epushbutton.h"
#include <QtGui>

class RightPop : public QWidget
{
Q_OBJECT

public:
RightPop(QWidget *parent = 0);
~RightPop();
void showMessage();

protected:
void paintEvent(QPaintEvent *event);

private slots:
void onMove();
void onStay();
void onClose();
void onExit();

private:
QPixmap backGroundPix;
EPushButton *closeButton;

QTimer *showTimer;
QTimer *stayTimer;
QTimer *closeTimer;
QPoint point;
double transparentPercent;
int desktopHeight;
};

#endif // RIGHTPOP_H

（2）rightpop.cpp

#include "rightpop.h"

RightPop::RightPop(QWidget *parent)
: QWidget(parent, Qt::FramelessWindowHint| Qt::ToolTip)
, transparentPercent(1.0)
{
resize(300, 200);
backGroundPix.load(":/background.png");
backGroundPix = backGroundPix.scaled(width(), height(), Qt::KeepAspectRatio, Qt::SmoothTransformation);

closeButton = new EPushButton(this);
closeButton->setPixName(":/close");
closeButton->setToolTip(tr("close"));
closeButton->move(width() - 27, 0);
connect(closeButton, SIGNAL(clicked()), this, SLOT(onExit()));

showTimer = new QTimer(this);
showTimer->setInterval(5);
stayTimer = new QTimer(this);
stayTimer->setInterval(5000);
closeTimer = new QTimer(this);
closeTimer->setInterval(5);

connect(showTimer, SIGNAL(timeout()), this, SLOT(onMove()));
connect(stayTimer, SIGNAL(timeout()), this, SLOT(onStay()));
connect(closeTimer, SIGNAL(timeout()), this, SLOT(onClose()));
showMessage();
}

RightPop::~RightPop()
{

}

void RightPop::showMessage()
{
QRect rect = QApplication::desktop()->availableGeometry();
point.setX(rect.width() - width());
point.setY(rect.height() + 50);
desktopHeight = rect.height() + 50;
move(point.x(), point.y());
showTimer->start();
}

void RightPop::onMove()
{
desktopHeight--;
move(point.x(), desktopHeight);
if (desktopHeight <= point.y() - 200) {
showTimer->stop();
stayTimer->start();
}
}

void RightPop::onStay()
{
stayTimer->stop();
closeTimer->start();
}

void RightPop::onClose()
{
//    transparentPercent -= 0.1;
//    qDebug() << transparentPercent;
//    if (transparentPercent <= 0.0) {
//        closeTimer->stop();
//        onExit();
//    }
//    else {
//        setWindowOpacity(transparentPercent);
//    }
desktopHeight++;
move(point.x(), desktopHeight);
if (desktopHeight >= point.y()) {
closeTimer->stop();
onExit();
}
}

void RightPop::onExit()
{
exit(0);
}

void RightPop::paintEvent(QPaintEvent *event)
{
QPainter painter(this);
painter.drawPixmap(0, 0, width(), height(), backGroundPix);
painter.setFont(QFont("arial", 10, QFont::Bold));
painter.setPen(QColor("#FFFFFF"));
painter.setBrush(QColor("#FFFFFF"));
painter.drawText(QRectF(5, 5, 100, 35), tr("Happy New Year"));
painter.drawRect(QRectF(0, 30, width(), height() - 30));

QWidget::paintEvent(event);
}

三、总结

（1）在centos下setWindowOpacity(0)设置透明度没有效果，故采用弹入弹出界面。

（2）上述代码采用定时器的启动和关闭来简单实现动画的功能。

（3）完整的工程代码已上传到CSDN：http://download.csdn.net/detail/taiyang1987912/9422290。