Archived:如何在Symbian应用程序/widget中使用Qt加载和缩放图片

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Qt Quick should be used for all UI development on mobile devices. The approach described in this article (based on QWidget) is deprecated.

文章信息

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代码示例

源文件: Media:QtSetBackground.zip

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文章

翻译:

翻译自: Archived:Load, Resize image and set background image in Qt application/widget

由 hoolee

最后由 hamishwillee 在 11 Oct 2012 编辑

简介

下列代码片段演示了如何加载图片，缩放图片以及如何将图片设置为程序或widget的背景图。这里的API QPixmap()将可以传入文件名然后加载图片，API QPixmap::scaled()'将返回给定高宽缩放后的图片拷贝，QPalette::setBrush() Brush颜色，QWidget::setPalette() 为widget设置给定的调色板。

下列代码自签名即可执行，并无用到需要额外能力的API

需要的头文件

#include <QPalette>
#include <QDesktopWidget>

Source

void SetBackground::SetBackgroundImage()
{
	//Using QPalette you can set background image as follows.
	 QPalette p = palette();
 
	 //Load image to QPixmap, Give full path of image
	QPixmap pixmap1("c://01.JPG"); //For emulator C: is ..\epoc32\winscw\c so image must be at that location
 
	//resize image if it is larger than screen size.
	QDesktopWidget* desktopWidget = QApplication::desktop();
	QRect rect = desktopWidget->availableGeometry();
 
	QSize size(rect.width() , rect.height());
	//resize as per your requirement..
	QPixmap pixmap(pixmap1.scaled(size));
 
	p.setBrush(QPalette::Background,  pixmap);
	setPalette(p);
}

后记

上述代码在一个程序中显示了背景图

示例代码

• Code Example将背景图设置为上述图片，已经在Nokia 5800 XpressMusic手机测试