/********************************************************************************
 * File Name:			Menu.c 
 * Function Describe:	Menu 控件
 * Relate Module:		GUI.c
 * Writer:		Shliangwen
 * Date:		2016-1-8
 *******************************************************************************/
 #include "Includes.h"


 /******************************************************************
返回串str在LCD显示所占的x坐标长度
*******************************************************************/
int GetStrXLen(char *str)
{
	unsigned char ch;
	unsigned short len;
	len=0;
	while ((ch=*str++)){
		if(ch=='M')len+=16;
		else len+=8;
		if(len>LCD_WIDTH-1){//191
			len=LCD_WIDTH-1;
			break;
		}
	}
	return (unsigned char )len;
}

 /*************************************************************************
*居中显示
***************************************************************************/
void ShowCaption(const char *str,unsigned char y)
{
	char buf[30];
	int len;
	len=GetStrXLen((char *)str);
	GuiShowStr((LCD_WIDTH-len)/2,y,str,0x01);
}

/*************************************************************************
MenuInit
***************************************************************************/
void MenuInit(struct SUT_MENU *p,const char **item)
{
	unsigned char i,ch;
	//calculate menu item number
	p->item = item; 
	i = 0;
	for(;;)
	{
		ch=p->item[i][0];
		if(ch==0)break;
		i ++;
	}
	i=i-1;
	p->itemnum = i+1;
	p->pgaenum=i/MENU_ROW;
	if(p->pgaenum%MENU_ROW)p->pgaenum+=1;
	//
	p->page = 0;
	p->handle = 0;
	
	MenuShow(p);
	
}

/********************************************************************************
 * Function:MenuShowItem
 * display menu item
 *******************************************************************************/
void MenuShowItem(struct SUT_MENU *p,unsigned char handle)
{
	unsigned char y,hand;
	hand=handle % MENU_ROW;
	y=MENU_TOPY+hand*(16+MENU_SPACE);
	GuiClearArea((LCD_WIDTH-MENU_BAR_LEN)/2,y-1,MENU_BAR_LEN,18);
	ShowCaption(p->item[handle],y);	
}

/********************************************************************************
 * Function:MenuShowBar
 * display a bar 
 *******************************************************************************/
void MenuShowBar(struct SUT_MENU *p)
{
	unsigned char x,y,h,handle;
	char *str;
	

	x=(LCD_WIDTH-MENU_BAR_LEN)/2;
	handle=p->handle%MENU_ROW;
	y=MENU_TOPY+handle*(16+MENU_SPACE);
	
	GuiReverseRect(x,y-1,MENU_BAR_LEN,18);
}
/********************************************************************************
 * Function:MenuShow
 * display menu
 *******************************************************************************/
void MenuShow(struct SUT_MENU *p)
{
	unsigned char i,j;
	u16 x,y;
	
	j=p->page*MENU_ROW;

	
	for(i = j ; i <j+MENU_ROW ; i ++)
	{
		if(i >= p->itemnum){
			y=MENU_TOPY+(i % MENU_ROW)*(16+MENU_SPACE);
			GuiClearArea((LCD_WIDTH-MENU_BAR_LEN)/2,y-1,MENU_BAR_LEN,18);
		}else{
			MenuShowItem(p,i);		
		}
		
	}
	MenuShowBar(p);

	//显示箭头
	x=MENU_BAR_LEN+(LCD_WIDTH-MENU_BAR_LEN)/2;
	if(p->page>0){
		GuiShowArrow(x+10,MENU_TOPY,8,3);//向上箭头
	}else{
		GuiClearArea(x,MENU_TOPY,18,8);
	}
	
	y=MENU_TOPY+MENU_ROW*(16+MENU_SPACE);
	if(p->page<(p->pgaenum-1)){
		GuiShowArrow(x+10,y,8,4);//向下箭头
	}else{
		GuiClearArea(x,y-8,18,8);
	}
}
/********************************************************************************
 * Function:MenuResponse
 *******************************************************************************/
unsigned long MenuResponse(struct SUT_MENU *p)
{
	unsigned char temp;
	switch(g_ulKeyValue)
	{
		case KEY_PANEL_UP:
			MenuShowBar(p);
			if(p->handle==0)p->handle=(p->itemnum-1);
			else p->handle --;
			temp=p->page;
			p->page=p->handle/MENU_ROW;
			if(temp!=p->page)MenuShow(p); 
			else MenuShowBar(p);

			break;
		case KEY_PANEL_DOWN:
			MenuShowBar(p);
			p->handle ++;
			if(p->handle>=p-> itemnum)p->handle=0;
			temp = p->page;
			p->page=p->handle/MENU_ROW;
			if(temp!=p->page)MenuShow(p);
			else MenuShowBar(p);
			
			break;
		
//		case KEY_PANEL_OK:
//			return MENU_KEY_ENTER;
//		
//		case KEY_PANEL_EXIT:
//			return MENU_KEY_BACK;
//		
		default:
			return g_ulKeyValue;
			break;
	}
	return 0;
}

/********************************************************************************
 * Function:MenuGetHandle
 * get menu 's  handle
 *******************************************************************************/
unsigned char MenuGetHandle(struct SUT_MENU *p)
{
	unsigned char handle;

	handle = p->handle;
	/*
	for(i = 0 ; i <= p->handle ; i ++)
	{
		if(p->item[i][0] == 0)handle --;
	}
	*/
	return handle;
}