(1)emWin通过skinning方式实现控件位图皮肤:
1)emWin传统贴皮肤图片的方法,是调用APP函数XXXX_SetBitmap()方式实现,但非常非常麻烦。
2)要想把控件显示出来,emWin每种控件都有1个控件绘制函数,而把这个控件绘制函数改成我们自己编写的"自定义绘制函数",这样我们想把这个控件画成什么样都行,emWin已经不参与这个控件的绘制工作了;在这个自定义绘制函数里面我们什么都不干,只显示出这个控件的图片,这就是用skinning方式实现位图皮肤。
3)支持整幅图片贴图,不需要对整幅图片进行切片分解,非常便捷。
如上图所示,(x0,y0)为整幅图片的显示坐标,(x1,y1)和(x2,y2)是emWin为控件自动生成的剪切显示坐标,我们只需要调用GUI_DrawBitmap()函数在(x0,y0)显示整幅图片即可,emWin会自动剪切显示出该控件的位图皮肤,功能非常强大。
(2)Button控件的自定义绘制函数:
SKIN_button.c
skinning.h
#include "DIALOG.h"
#include "GUI.h"
#include "skinning.h"
//获取父窗口句柄,即主页面句柄,保存着页面位图的指针
static WM_HWIN WM_GetParent1C(WM_HWIN hChild) {return hChild;}
static WM_HWIN WM_GetParent2C(WM_HWIN hChild) {return WM_GetParent(hChild);}
static WM_HWIN WM_GetParent3C(WM_HWIN hChild) {return WM_GetParent(WM_GetParent(hChild));}
static WM_HWIN WM_GetParent4C(WM_HWIN hChild) {return WM_GetParent(WM_GetParent(WM_GetParent(hChild)));}
static WM_HWIN WM_GetParent5C(WM_HWIN hChild) {return WM_GetParent(WM_GetParent(WM_GetParent(WM_GetParent(hChild))));}
static WM_HWIN WM_GetParent6C(WM_HWIN hChild) {return WM_GetParent(WM_GetParent(WM_GetParent(WM_GetParent(WM_GetParent(hChild)))));}
static WM_HWIN WM_GetParent7C(WM_HWIN hChild) {return WM_GetParent(WM_GetParent(WM_GetParent(WM_GetParent(WM_GetParent(WM_GetParent(hChild))))));}
static WM_HWIN WM_GetParent8C(WM_HWIN hChild) {return WM_GetParent(WM_GetParent(WM_GetParent(WM_GetParent(WM_GetParent(WM_GetParent(WM_GetParent(hChild)))))));}
static WM_HWIN (*WM_GET_PARENT[])(WM_HWIN) = {WM_GetParent1C,WM_GetParent2C,WM_GetParent3C,WM_GetParent4C,WM_GetParent5C,WM_GetParent6C,WM_GetParent7C,WM_GetParent8C};
//Button控件的自定义绘制函数
static int SKIN_button(const WIDGET_ITEM_DRAW_INFO * pDrawItemInfo, unsigned char C)
{
WM_HWIN hWin;
int x0, y0;
WINDOW_BMP *winBMP;
switch (pDrawItemInfo->Cmd)
{
case WIDGET_ITEM_CREATE:
//case WIDGET_ITEM_DRAW_BACKGROUND:
case WIDGET_ITEM_DRAW_BITMAP:
//case WIDGET_ITEM_DRAW_TEXT:
break;
default: return BUTTON_DrawSkinFlex(pDrawItemInfo);//emWin默认控件绘制函数
case WIDGET_ITEM_DRAW_BACKGROUND:
hWin = (WM_GET_PARENT[C-1])(pDrawItemInfo->hWin);//位于第几层修改这里(WM_GetParent数=层数-1)
WM_GetUserData(hWin, &winBMP, sizeof(winBMP));//从用户数据区读出"页面图片结构体"指针
//获取此控件相对于主页面(比如:WINDOW)位置偏移坐标
x0 = WM_GetWindowOrgX(hWin) - WM_GetWindowOrgX(pDrawItemInfo->hWin);
y0 = WM_GetWindowOrgY(hWin) -WM_GetWindowOrgY(pDrawItemInfo->hWin);
if(pDrawItemInfo->ItemIndex == BUTTON_SKINFLEX_PI_ENABLED)
GUI_DrawBitmap(winBMP->normal, x0, y0);//从页面坐标显示图片,emWin会自己剪切出这个控件范围的图片
else if(pDrawItemInfo->ItemIndex == BUTTON_SKINFLEX_PI_PRESSED)
GUI_DrawBitmap(winBMP->mark, x0, y0);
else if(pDrawItemInfo->ItemIndex == BUTTON_SKINFLEX_PI_FOCUSSED)
GUI_DrawBitmap(winBMP->focus, x0, y0);
else if(pDrawItemInfo->ItemIndex == BUTTON_SKINFLEX_PI_DISABLED)
GUI_DrawBitmap(winBMP->disable, x0, y0);
else BUTTON_DrawSkinFlex(pDrawItemInfo);
break;
case WIDGET_ITEM_DRAW_TEXT:
return BUTTON_DrawSkinFlex(pDrawItemInfo);
}
return 0;
}
//Button控件的自定义绘制函数,位于第2层(比如:WINDOW->BUTTON)
int SKIN_button2C(const WIDGET_ITEM_DRAW_INFO * pDrawItemInfo){
return SKIN_button(pDrawItemInfo, 2);
}
//Button控件的自定义绘制函数,位于第3层(比如:FRAMEWIN->CLIENT->BUTTON)
int SKIN_button3C(const WIDGET_ITEM_DRAW_INFO * pDrawItemInfo){
return SKIN_button(pDrawItemInfo, 3);
}
//Button控件的自定义绘制函数,位于第4层(比如:WINDOW->FRAMEWIN->CLIENT->BUTTON)
int SKIN_button4C(const WIDGET_ITEM_DRAW_INFO * pDrawItemInfo){
return SKIN_button(pDrawItemInfo, 4);
}
//Button控件的自定义绘制函数,位于第5层(比如:WINDOW->MULTIPAGE->CLIENT->WINDOW->BUTTON)
int SKIN_button5C(const WIDGET_ITEM_DRAW_INFO * pDrawItemInfo){
return SKIN_button(pDrawItemInfo, 5);
}
(3)Skinning方式实现位图皮肤的实施步骤:
1)创建窗体时,将"页面图片结构体指针"保存于窗体中:
WINDOW_BMP *winBMP;
static WINDOW_BMP BMP_WIN_main;//为"WIN_main"页面定义1个"页面图片结构体"
BMP_WIN_main.normal = &bmPage2_N;//将不同状态的页面BMP位图赋值给"页面图片结构体"
BMP_WIN_main.mark = &bmPage2_M;
BMP_WIN_main.focus = &bmPage2_N;
BMP_WIN_main.disable = &bmPage2_N;
BMP_WIN_main.thumbN = &bmPage2_N;
BMP_WIN_main.thumbM = &bmPage2_N;
winBMP = &BMP_WIN_main;
hWin = CreateWindow2(WM_HBKWIN);//创建WINmain页面
WM_SetUserData(hWin, &winBMP, sizeof(winBMP));//将"页面图片结构体"指针写到用户数据区
2)在窗体初始化WM_INIT_DIALOG消息中,把BUTTON控件的绘制函数改成自定义绘制函数:
hItem = WM_GetDialogItem(pMsg->hWin, ID_BUTTON_0);//获取句柄
BUTTON_SetSkin(hItem, SKIN_button2C);//将这个BUTTON控件改成自定义绘制函数
(4)总结:
以整幅图片实现emWin位图皮肤应该是诺嵌光电业界首创的方法,可以大大减轻控件贴图的工作量,保守估计贴图工作效率至少提高10倍以上。如果把每个控件对应的图片先切片分解下来,然后再转换成C文件,最后再贴图到控件上面去,那样工作量将是非常恐怖的!
源码下载: \docs\demoEM\demo_emwin_CodeBlocks\skinPRJ_WINemWin530noOS_CodeBlocks_v127.rar
如何打开源码看博文:emWin 2天速成实例教程000_如何快速入门ucGUI/emWin