Qt2.2.0 透明的 QPushButton

基本思路:

1.将父窗口的背景拷贝到pushbutton的背景中;

2.重写paintEvent()方法;

 

 

 

目前存在一个缺点,当动态移动时需要手动刷新pushbutton的背景,因为背景拷贝是在构造函数完成的。

待续完善 .....

 

a) TPushButton.h文件

 

#ifndef TPUSHBUTTON_H
#define TPUSHBUTTON_H
#include <qpushbutton.h>

class TPushButton: public QPushButton
{
private:
    QString m_picture;
       
public:
    TPushButton( QWidget *parent, const char *name=0 );
   
    void SetBackground(const QString& );
    void paintEvent( QPaintEvent * );
};

#endif

 

b) TPushButton.cpp文件

#include <qpainter.h>

#include <stdio.h>
#include <unistd.h>

#include "../debug/debug.h"
#include "TPushButton.h"

#if 1
#define _debug_btn
#endif

#ifdef _debug_btn
#define debug_btn(fmt,...) debug(fmt,##__VA_ARGS__)
#else
#define debug_btn(fmt,...)
#endif

TPushButton::TPushButton( QWidget *parent, const char *name ) : QPushButton( parent, name )
{
#if 1
    setBackgroundPixmap(*parentWidget()->backgroundPixmap());
    setBackgroundOrigin(QWidget::ParentOrigin); //当有多个父控件时可使用绝对坐标,QWidget::WindowOrigin或QWidget::AncestorOrigin
#else
    setAutoMask(TRUE);
    setBackgroundMode(NoBackground);
#endif       
}

void TPushButton::SetBackground(const QString& picture)                 
{
    m_picture = picture;
}   

void TPushButton::paintEvent( QPaintEvent *event )
{
    debug_btn("paintEvent/n");
    QPainter paint(this);
    QPixmap *icon = new QPixmap(m_picture);
   
    if(m_picture==""){
        debug_btn("drawButton/n");
        drawButton( &paint );
    }else
    {
        int x1, y1, x2, y2;
        rect().coords( &x1, &y1, &x2, &y2 );
       
        if(isDown())
        {
            debug_btn("draw rect/n");
           
            QColorGroup g = colorGroup();
       
            paint.setPen( g.foreground() );
            paint.setBrush( QBrush(g.button(),NoBrush) );
   
            erase( event->region() );
            paint.drawPixmap( 1, 1, *icon );
            drawButtonLabel(&paint);
   
            paint.setPen( QColor(80,80,80) );//g.shadow()
            paint.drawRect( x1, y1, x2-x1+1, 1 );
            paint.drawRect( x1, y1, 1, y2-y1+1 );
           
            paint.setPen( QColor(250,250,250) );//g.shadow()
            paint.drawRect( x1, y2, x2-x1+1, 1 );
            paint.drawRect( x2, y1, 1, y2-y1+1 );
        }else{           
            debug_btn("drawPixmap/n");
            erase( event->region() );
            paint.drawPixmap( 0, 0, *icon );
            drawButtonLabel(&paint);
        }
               
        if ( hasFocus() ) {
             QRect r(x1, y1, x2-x1, y2-y1);
             style().drawFocusRect( &paint, r , colorGroup(), &colorGroup().button() );
        }
 
    }
    delete icon;
}

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