电子产品量产工具（4）-UI系统实现

4 UI系统设计

4.1 UI系统头文件front_manager.h

在头文件中抽象出结构体来描述按键的位置、大小信息以及被按下后的处理信息

4.1.1 按钮结构体Button

typedef int (*ONDRAW_FUNC)(struct Button *ptButton, PDispBuff ptDispBuff);
typedef int (*ONPRESSED_FUNC)(struct Button *ptButton, PDispBuff ptDispBuff, PInputEvent ptInputEvent);
....
typedef struct Button {
    
	char *name;  /*按键名*/
	int status;  /*按键状态*/
	Region tRegion;  /*按键位置、大小信息*/
	ONDRAW_FUNC OnDraw; /*绘制按键*/
	ONPRESSED_FUNC OnPressed;/*按键处理函数*/
}Button, *PButton;

4.1.2 front_manager.h完整代码

#ifndef _UI_H
#define _UI_H
#include <common.h>
#include <disp_manager.h>
#include <input_manager.h>
#define BUTTON_DEFAULT_COLOR 0xff0000
#define BUTTON_PRESSED_COLOR 0x00ff00
#define BUTTON_TEXT_COLOR 0x000000
struct Button;
typedef int (*ONDRAW_FUNC)(struct Button *ptButton, PDispBuff ptDispBuff);
typedef int (*ONPRESSED_FUNC)(struct Button *ptButton, PDispBuff ptDispBuff, PInputEvent ptInputEvent);

typedef struct Button {
    
	char *name;
	int status;
	Region tRegion;
	ONDRAW_FUNC OnDraw;
	ONPRESSED_FUNC OnPressed;
}Button, *PButton;

void InitButton(PButton ptButton, char *name, PRegion ptRegion, ONDRAW_FUNC OnDraw, ONPRESSED_FUNC OnPressed);
#endif

4.2 按钮button.c

4.2.1 按钮初始化函数InitButton

void InitButton(PButton ptButton, char *name, PRegion ptRegion, ONDRAW_FUNC OnDraw, ONPRESSED_FUNC OnPressed)
{
    
	ptButton->status = 0;    /*按键状态*/
	ptButton->name = name;  /*按键名*/
	ptButton->tRegion = *ptRegion;  /*按键位置信息*/
	ptButton->OnDraw    = OnDraw ? OnDraw : DefaultOnDraw; /*若没有指定绘制函数，使用默认绘制函数*/
	ptButton->OnPressed = OnPressed ? OnPressed : DefaultOnPressed; /*若没有指定按键处理函数，使用默认按键处理函数*/
}

4.2.2 默认绘制函数InitButton

绘制出长方形按钮

static int DefaultOnDraw(struct Button *ptButton, PDispBuff ptDispBuff)
{
    
	/* 绘制底色 */
	DrawRegion(&ptButton->tRegion, BUTTON_DEFAULT_COLOR);
	/* 居中写文字 */
	DrawTextInRegionCentral(ptButton->name, &ptButton->tRegion, BUTTON_TEXT_COLOR);
	/* flush to lcd/web */
	FlushDisplayRegion(&ptButton->tRegion, ptDispBuff);
	return 0;
}

4.2.3 默认按键处理函数InitButton

按下按键后按钮变色

static int DefaultOnPressed(struct Button *ptButton, PDispBuff ptDispBuff, PInputEvent ptInputEvent)
{
    
	unsigned int dwColor = BUTTON_DEFAULT_COLOR;	
	ptButton->status = !ptButton->status;
	if (ptButton->status)
		dwColor = BUTTON_PRESSED_COLOR;
	/* 绘制底色 */
	DrawRegion(&ptButton->tRegion, dwColor);
	/* 居中写文字 */
	DrawTextInRegionCentral(ptButton->name, &ptButton->tRegion, BUTTON_TEXT_COLOR);
	/* flush to lcd/web */
	FlushDisplayRegion(&ptButton->tRegion, ptDispBuff);
	return 0;
}

4.2.4 button.c完整代码

#include <ui.h>
static int DefaultOnDraw(struct Button *ptButton, PDispBuff ptDispBuff)
{
    
	/* 绘制底色 */
	DrawRegion(&ptButton->tRegion, BUTTON_DEFAULT_COLOR);
	/* 居中写文字 */
	DrawTextInRegionCentral(ptButton->name, &ptButton->tRegion, BUTTON_TEXT_COLOR);
	/* flush to lcd/web */
	FlushDisplayRegion(&ptButton->tRegion, ptDispBuff);
	return 0;
}

static int DefaultOnPressed(struct Button *ptButton, PDispBuff ptDispBuff, PInputEvent ptInputEvent)
{
    
	unsigned int dwColor = BUTTON_DEFAULT_COLOR;	
	ptButton->status = !ptButton->status;
	if (ptButton->status)
		dwColor = BUTTON_PRESSED_COLOR;
	/* 绘制底色 */
	DrawRegion(&ptButton->tRegion, dwColor);
	/* 居中写文字 */
	DrawTextInRegionCentral(ptButton->name, &ptButton->tRegion, BUTTON_TEXT_COLOR);
	/* flush to lcd/web */
	FlushDisplayRegion(&ptButton->tRegion, ptDispBuff);
	return 0;
}

void InitButton(PButton ptButton, char *name, PRegion ptRegion, ONDRAW_FUNC OnDraw, ONPRESSED_FUNC OnPressed)
{
    
	ptButton->status = 0;
	ptButton->name = name;
	ptButton->tRegion = *ptRegion;
	ptButton->OnDraw    = OnDraw ? OnDraw : DefaultOnDraw;
	ptButton->OnPressed = OnPressed ? OnPressed : DefaultOnPressed;
}

4.3 测试代码

#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <linux/fb.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <sys/ioctl.h>
#include <stdlib.h>
#include <disp_manager.h>
#include <font_manager.h>
#include <ui.h> /*包含必要头文件*/

int main(int argc, char **argv)
{
    
	PDispBuff ptBuffer;
	int error;
	Button tButton;
	Region tRegion;

	if (argc != 2)
	{
    
		printf("Usage: %s <font_size>\n", argv[0]); //打印用法
		return -1;
	}
		
	DisplayInit();  //显示系统初始化
	SelectDefaultDisplay("fb"); //选择lcd设备显示
	InitDefaultDisplay(); //初始化lcd设备显示
	ptBuffer = GetDisplayBuffer();//获取内存
	FontsRegister(); //字体注册
	error = SelectAndInitFont("freetype", argv[1]);//字体大小设置
	if (error)
	{
    
		printf("SelectAndInitFont err\n");
		return -1;
	}
    /*指定按键形状、位置信息*/
	tRegion.iLeftUpX = 200; 
	tRegion.iLeftUpY = 200;
	tRegion.iWidth   = 300;
	tRegion.iHeigh   = 100;
	
	InitButton(&tButton, "yiyifufu", &tRegion, NULL, NULL); //按键初始化
	tButton.OnDraw(&tButton, ptBuffer); //绘制案件即显示红色按钮与对应按键名
	while (1) //按键按下颜色反转
	{
    
		tButton.OnPressed(&tButton, ptBuffer, NULL); 
		sleep(2);
	}
	
	return 0;	
}