Qt中添加背景圖片

1. QPalette的方法

int?main(int?argc,?char?*argv[])
{
????QApplication?app(argc,argv);
????
????QFrame?*frame?=?new?QFrame;
????frame->resize(400,700);

????QImage?image1；
????image1.load("images/frame1.jpg");
????QImage?image2?=?image1.scaled(400,700);

????QPalette???palette;
????palette.setBrush(frame->backgroundRole(),QBrush(image2));
????frame->setPalette(palette);
????frame->setMask(pixmap.mask());??//可以將圖片中透明部分顯示為透明的
????frame->setAutoFillBackground(true);
????frame->show();

????return?app.exec();
}

注意圖片路徑怎么表示，我的圖片放在該工程下的images文件夾中。能解決圖片大小和空間大小不一致的問題

2.setStyleSheet方法(非常好用的方法)

#include#includeint?main(int?argc,?char?*argv[])
{
????QApplication?app(argc,argv);
????QFrame?*frame?=?new?QFrame;
????frame->setObjectName("myframe");
????frame->resize(400,700);
????frame->setStyleSheet("QFrame#myframe{border-image:url(images/frame.png)}"?);
????frame->show();

????return?app.exec();
}

注意：很漂亮的效果吧～～注意代碼中紅線的部分噢，設(shè)置ObjectName后，才能保證setStyleSheet只作用在我們的frame上，不影響其子控件的背景設(shè)置。之所以用border-image而不用background-image，還是上面的問題，用background-image不能保證圖片大小和控件大小一致，圖片不能完全顯示，這個以后再補充了，現(xiàn)在還沒有找到方法。

3.paintEvent事件方法

//myframe.h文件
#ifndef?MYFRAME_H
#define?MYFRAME_H

#include#includeclass?MyFrame?:?public?QWidget
{
public:
????MyFrame();
????void?paintEvent(QPaintEvent?*event);
};

#endif?//?MYFRAME_H

//myframe.cpp文件
#include?"myframe.h"

MyFrame::MyFrame()
{
}

void?MyFrame::paintEvent(QPaintEvent?*event)
{
????QPainter?painter(this);
????painter.drawPixmap(0,0,400,700,QPixmap("images/frame.png"));
}

//main.cpp文件
#include#include#include?"myframe.h"

int?main(int?argc,?char?*argv[])
{
????QApplication?app(argc,argv);
????
????MyFrame?*frame?=?new?MyFrame;
????frame->resize(400,700);
????frame->show();

????return?app.exec();
}

注：跟前面一樣的效果吧，與前面的差別就是這個背景圖片不隨著窗口的大小而變化，因為它的固定大小被設(shè)置成(400，700)了。重寫QWidget的paintEvent事件，當(dāng)控件發(fā)生重繪事件，比如show()時，系統(tǒng)就會自動調(diào)用paintEvent函數(shù)

好了，上面是三種設(shè)置背景圖片的方法，下面我要說一個設(shè)置QPushButton的背景圖片的方法，用的是setIcon方法(其實QPushButton設(shè)置背景圖片也可以用前面三種方法的，不過現(xiàn)在這種Icon方法的看起來也不錯)

#include#includeint?main(int?argc,?char?*argv[])
{
????QApplication?app(argc,argv);

????QFrame?*frame?=?new?QFrame;
????QPushButton?*?button0?=?new?QPushButton(frame);
????QPushButton?*?button1?=?new?QPushButton(frame);
????QPushButton?*?button2?=?new?QPushButton(frame);
????QPushButton?*?button3?=?new?QPushButton(frame);
????QPushButton?*?button4?=?new?QPushButton(frame);
????QPushButton?*?button5?=?new?QPushButton(frame);

????frame->setObjectName("myframe");
????frame->resize(400,700);
????frame->setStyleSheet("QFrame#myframe{border-image:url(images/frame.png)}"?);

????button0->setGeometry(60,150,68,68);
????button1->setGeometry(160,150,68,68);
????button2->setGeometry(260,150,68,68);
????button3->setGeometry(60,280,68,68);
????button4->setGeometry(160,280,68,68);
????button5->setGeometry(260,280,68,68);

????QIcon?icon;
????QPixmap?pixmap0("images/SMS.png");
????icon.addPixmap(pixmap0);
????button0->setIcon(icon);
????button0->setIconSize(QSize(68,68));
????button0->setFixedSize(pixmap0.size());
????button0->setMask(pixmap0.mask());


????QPixmap?pixmap1("images/EMail.png");
????icon.addPixmap(pixmap1);
????button1->setIcon(icon);
????button1->setIconSize(QSize(68,68));
????button1->setFixedSize(pixmap1.size());
????button1->setMask(pixmap1.mask());


????QPixmap?pixmap2("images/Contacts.png");
????icon.addPixmap(pixmap2);
????button2->setIcon(icon);
????button2->setIconSize(QSize(68,68));
????button2->setFixedSize(pixmap2.size());
????button2->setMask(pixmap2.mask());

????QPixmap?pixmap3("images/Calendar.png");
????icon.addPixmap(pixmap3);
????button3->setIcon(icon);
????button3->setIconSize(QSize(68,68));
????button3->setFixedSize(pixmap3.size());
????button3->setMask(pixmap3.mask());


????QPixmap?pixmap4("images/GoogleVoice.png");
????icon.addPixmap(pixmap4);
????button4->setIcon(icon);
????button4->setIconSize(QSize(68,68));
????button4->setFixedSize(pixmap4.size());
????button4->setMask(pixmap4.mask());


????QPixmap?pixmap5("images/AndroidMarket.png");
????icon.addPixmap(pixmap5);
????button5->setIcon(icon);
????button5->setIconSize(QSize(68,68));
????button5->setFixedSize(pixmap5.size());
????button5->setMask(pixmap5.mask());


????frame->show();

????return?app.exec();
}