在BREW中打造自己的GUI(5)-滚动条的实现
2008-03-04 12:38
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前面做IGStatic时我们用到了一个滚动条组件IGScrollBar,现在说说它的实现方法,它的结构很简单:
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedBlockStart.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ContractedBlock.gif)
struct _IGScrollBar ...{
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
const AEEVTBL(IGScrollBar) * pvt;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
uint32 m_nRefs;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
IShell *m_pIShell;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
IDisplay *m_pIDisplay;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
IModule *m_pIModule;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
boolean m_isActive;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
AEERect m_Rect;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
uint32 props;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
int min;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
int max;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
int pos;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
int len;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedBlockEnd.gif)
};
也就是一个最小值min、最大值max、当前位置pos和定位块的长度len。
接口方法呢?主要就是几个设置函数:
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
AEEINTERFACE(IGScrollBar)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedBlockStart.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ContractedBlock.gif)
...{
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
DECLARE_IBASE(IGScrollBar)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
DECLARE_ICONTROL(IGScrollBar)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
void (*SetRange) (IGScrollBar * po, int min,int max);
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
void (*SetPosition) (IGScrollBar * po, int start,int end);
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedBlockEnd.gif)
};
看看实现代码,同样,先看HandleEvent的处理,又是简单地返回FALSE,因为我把滚动条组作为一个辅助组件,它不自己处理事件,只是用来附着在其它组件上罢了。
在它的Redraw中,我们要做的事情只是显示一个水平或垂直的矩形条和上面的小的定位块即可:
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
static boolean IGScrollBar_Redraw(IGScrollBar * pMe)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedBlockStart.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ContractedBlock.gif)
...{
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
AEERect r;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
IDISPLAY_EraseRect(pMe->m_pIDisplay,&pMe->m_Rect);
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
IDISPLAY_DrawRect(pMe->m_pIDisplay,&pMe->m_Rect,MAKE_RGB(0,0,0),-1,IDF_RECT_FRAME);
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
if(pMe->props==GSCROLL_HOR)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ContractedSubBlock.gif)
...{
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
int x,w;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
x=pMe->m_Rect.x+pMe->m_Rect.dx*(pMe->pos*1000/pMe->max)/1000;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
w=pMe->m_Rect.dx*(pMe->len*1000/pMe->max)/1000;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
SETAEERECT(&r,x,pMe->m_Rect.y,w,pMe->m_Rect.dy);
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
else
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ContractedSubBlock.gif)
...{
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
int y,h;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
y=pMe->m_Rect.y+pMe->m_Rect.dy*(pMe->pos*1000/pMe->max)/1000;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
h=pMe->m_Rect.dy*(pMe->len*1000/pMe->max)/1000;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
SETAEERECT(&r,pMe->m_Rect.x,y,pMe->m_Rect.dx,h);
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
IDISPLAY_FillRect(pMe->m_pIDisplay,&r,MAKE_RGB(0,0,0));
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
IDISPLAY_Update(pMe->m_pIDisplay);
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
return TRUE;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedBlockEnd.gif)
}
关键的问题在于如何确定定位块的大小(就是len值),水平滚动条它的高度固定与条的高度一致,而宽度则取决于内容的宽度(max)与滚动条mRect的宽度,它们的比例应该在定位块的宽度上体现上来。垂直滚动条同理。
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedBlockStart.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ContractedBlock.gif)
struct _IGScrollBar ...{
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
const AEEVTBL(IGScrollBar) * pvt;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
uint32 m_nRefs;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
IShell *m_pIShell;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
IDisplay *m_pIDisplay;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
IModule *m_pIModule;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
boolean m_isActive;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
AEERect m_Rect;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
uint32 props;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
int min;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
int max;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
int pos;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
int len;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedBlockEnd.gif)
};
也就是一个最小值min、最大值max、当前位置pos和定位块的长度len。
接口方法呢?主要就是几个设置函数:
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
AEEINTERFACE(IGScrollBar)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedBlockStart.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ContractedBlock.gif)
...{
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
DECLARE_IBASE(IGScrollBar)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
DECLARE_ICONTROL(IGScrollBar)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
void (*SetRange) (IGScrollBar * po, int min,int max);
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
void (*SetPosition) (IGScrollBar * po, int start,int end);
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedBlockEnd.gif)
};
看看实现代码,同样,先看HandleEvent的处理,又是简单地返回FALSE,因为我把滚动条组作为一个辅助组件,它不自己处理事件,只是用来附着在其它组件上罢了。
在它的Redraw中,我们要做的事情只是显示一个水平或垂直的矩形条和上面的小的定位块即可:
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
static boolean IGScrollBar_Redraw(IGScrollBar * pMe)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedBlockStart.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ContractedBlock.gif)
...{
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
AEERect r;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
IDISPLAY_EraseRect(pMe->m_pIDisplay,&pMe->m_Rect);
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
IDISPLAY_DrawRect(pMe->m_pIDisplay,&pMe->m_Rect,MAKE_RGB(0,0,0),-1,IDF_RECT_FRAME);
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
if(pMe->props==GSCROLL_HOR)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ContractedSubBlock.gif)
...{
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
int x,w;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
x=pMe->m_Rect.x+pMe->m_Rect.dx*(pMe->pos*1000/pMe->max)/1000;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
w=pMe->m_Rect.dx*(pMe->len*1000/pMe->max)/1000;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
SETAEERECT(&r,x,pMe->m_Rect.y,w,pMe->m_Rect.dy);
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
else
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ContractedSubBlock.gif)
...{
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
int y,h;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
y=pMe->m_Rect.y+pMe->m_Rect.dy*(pMe->pos*1000/pMe->max)/1000;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
h=pMe->m_Rect.dy*(pMe->len*1000/pMe->max)/1000;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
SETAEERECT(&r,pMe->m_Rect.x,y,pMe->m_Rect.dx,h);
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
IDISPLAY_FillRect(pMe->m_pIDisplay,&r,MAKE_RGB(0,0,0));
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
IDISPLAY_Update(pMe->m_pIDisplay);
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
return TRUE;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedBlockEnd.gif)
}
关键的问题在于如何确定定位块的大小(就是len值),水平滚动条它的高度固定与条的高度一致,而宽度则取决于内容的宽度(max)与滚动条mRect的宽度,它们的比例应该在定位块的宽度上体现上来。垂直滚动条同理。
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