Qt实现屏幕底部冒泡效果的方法

#ifndef VERDESKTOP_H
#define VERDESKTOP_H
 
#include <QObject>
#include <QDesktopWidget>
 
class VerDesktop : public QObject
{
  Q_OBJECT
public:
  explicit VerDesktop(QObject *parent = 0);
  float getVerDesktop();
 
signals:
 
public slots:
};
 
#endif // VERDESKTOP_H

#include "verdesktop.h"
 
VerDesktop::VerDesktop(QObject *parent) : QObject(parent)
{
}
float VerDesktop::getVerDesktop()
{
  QDesktopWidget dw;
  float ver=float(dw.screenGeometry().width())/float(1920);
  return ver;
}

#ifndef MESSAGEDIALOG_H
#define MESSAGEDIALOG_H
#include <QDialog>
#include <QPropertyAnimation>
#include <QLabel>
#include "verdesktop.h"
#include <QTimer>
#include <QPaintEvent>
#include <QPainter>
 
 
class MessageDialog : public QDialog
{
  Q_OBJECT
public:
  float ver;
  VerDesktop *v;//适应屏幕分辨率
  explicit MessageDialog(QWidget *parent=0);
  QLabel *imagelabel;//头像
  QLabel *namelabel;//名
  void messagedialogseting();//设置
  QTimer *timer0;
private:
  void paintEvent(QPaintEvent *event);
 
public slots:
  void timerout();
};
 
#endif // MESSAGEDIALOG_H

#include "messagedialog.h"
#include <QApplication>
#include <QDesktopWidget>
#include <QGraphicsDropShadowEffect>
#include <QPalette>
 
MessageDialog::MessageDialog(QWidget *parent):QDialog(parent)
{
  v=new VerDesktop(this);
  ver=v->getVerDesktop();
  messagedialogseting();
  connect(timer0,SIGNAL(timeout()),this,SLOT(timerout()));
}
void MessageDialog::messagedialogseting()//显现的动画
{
  QPalette palette(this->palette());
  palette.setColor(QPalette::Background,QColor(49,225,215));
  setPalette(palette);
  setAutoFillBackground(true);
  setWindowFlags(Qt::FramelessWindowHint|windowFlags());
  QRect rect=QApplication::desktop()->availableGeometry();
  setGeometry(rect.width()-250*ver,rect.height()-80*ver,250*ver,80*ver);
  QGraphicsDropShadowEffect *effect=new QGraphicsDropShadowEffect(this);
  effect->setOffset(10,10);
  effect->setBlurRadius(10);
  effect->setColor(QColor(50,50,50));
  this->setGraphicsEffect(effect);
  imagelabel=new QLabel(this);
  namelabel=new QLabel(this);
  imagelabel->setGeometry(5*ver,15*ver,50*ver,50*ver);
  namelabel->setGeometry(90*ver,0,150*ver,80*ver);
  namelabel->setFont(QFont("微软雅黑",15*ver));
  namelabel->setAlignment(Qt::AlignCenter);
  QPropertyAnimation *animation0=new QPropertyAnimation(this,"geometry");
  animation0->setDuration(500*ver);
  animation0->setStartValue(QRect(rect.width(),rect.height()-80*ver,250*ver,80*ver));//起点
  animation0->setEndValue(QRect(rect.width()-250*ver,rect.height()-80*ver,250*ver,80*ver));//终点
  animation0->start(QAbstractAnimation::DeleteWhenStopped);
  timer0=new QTimer(this);
  timer0->start(1000);
}
void MessageDialog::timerout()//消失的动画
{
  timer0->stop();
  QPropertyAnimation *animation0=new QPropertyAnimation(this,"windowOpacity");
  animation0->setDuration(500);
  animation0->setStartValue(1);
  animation0->setEndValue(0);
  animation0->start(QAbstractAnimation::DeleteWhenStopped);
  connect(animation0,SIGNAL(finished()),this,SLOT(close()));
}
void MessageDialog::paintEvent(QPaintEvent *event)//做阴影
{
  const int x=3;
  Q_UNUSED(event);
  QPainterPath yinying_path;
  yinying_path.setFillRule(Qt::WindingFill);
  yinying_path.addRect(x,x,this->width()-2*x,this->height()-2*x);
  QPainter painter(this);
  painter.setRenderHint(QPainter::Antialiasing,true);
  QColor color(0,0,0,50);
  for(int i=0;i<x;i++)
  {
    QPainterPath path;
    path.setFillRule(Qt::WindingFill);
    path.addRect(x-i, x-i, this->width()-(x-i)*2, this->height()-(x-i)*2);
    color.setAlpha(150 - sqrt(i)*50);
    painter.setPen(color);
    painter.drawPath(path);
  }
}