[Qt-interest] How can I change a button's background?

[Alexandre Beraud]

Hi,

No, this will certainly make him lose all the benefits of the style.

Regards,

Alex


Oliver Demetz a écrit :
> Hi!
> You are trying to reimplemtent a feature which is already available out 
> of the box from the lib.
> Have a look into StyleSheets, eg
> button.setStyleSheet("background-image:url(./img.png);");
> Regards,
> Oliver
>
>
> Kermit Mei schrieb:
>   
>> Hello community!
>>
>> How can I change a button's background? 
>>
>> I know I can use styleSheet, but, my problem is that there're so many
>> buttons, and every button's background may be change by the users at
>> running time, and their background may not be the same. Also, I must
>> remember the last background changed by user, and reload them at the
>> next running time.
>>
>> How Can I do it? I what to use paintEvent() to do it, but when I repaint
>> the background, I can't see any different effect when I press the
>> buttons. My code is like this: 
>>
>> //The Header file:
>> #ifndef _REMOTEBUTTON_H
>> #define _REMOTEBUTTON_H
>>
>> #include <QPushButton>
>> #include <QString>
>>
>> class QPixmap;
>>
>> class RemoteButton : public QPushButton
>> {
>>   Q_OBJECT
>> public:
>>   RemoteButton(QWidget *parent = 0);
>>   ~RemoteButton();
>>
>>   void setBackGround(const QString picFile);
>>
>> protected:
>>   void paintEvent(QPaintEvent *event);
>>   QPixmap *pixmap;
>> };
>>
>> #endif //_REMOTEBUTTON_H
>>
>>
>> //The source file:
>> #include <QPen>
>> #include <QPainter>
>> #include <QLabel>
>> #include <QPixmap>
>>
>> #include "RemoteButton.h"
>>
>> RemoteButton::RemoteButton(QWidget *parent)
>>   :QPushButton(parent),pixmap(0)
>> {
>>   //Do Nothing Here!
>> }
>>
>> RemoteButton::~RemoteButton() {
>>   if(pixmap != 0)
>>     delete pixmap;
>> }
>>
>> void RemoteButton::setBackGround(const QString picFile) {
>>   if( pixmap != 0)
>>     delete pixmap;
>>   pixmap = new QPixmap(picFile);
>> }
>>
>> void RemoteButton::paintEvent(QPaintEvent *event) {
>>   if(pixmap != 0) {
>>     QPainter painter(this);
>>     painter.drawPixmap(0,0,width(),height(),*pixmap);
>>   }else
>>     QPushButton::paintEvent(event);
>> }
>>
>>
>> //The test main.cpp file
>> #include <QApplication>
>> #include "RemoteButton.h"
>>
>> int main(int argc,char *argv[])
>> {
>>   QApplication app(argc,argv);
>>   RemoteButton rBtn;
>>   rBtn.setBackGround("./bk.png");
>>   rBtn.show();
>>   return app.exec();
>> }
>>
>>
>> It can works, but I can't see and different effects when I press it.
>>
>> Hope your help.
>> Thanks:)
>>
>> Kermit
>>     
>
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>   


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