ftk学习记（消息框篇）

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    上一篇说到了输入框。闲话不多说，首先看结果显示，

    大家看看效果是不是和我们之前说的一样。今天，我们谈一下消息狂。这样的消息框事实上应用得特别多，有警告用的，有提问的，有信息的，也有提示的。没关系，ftk这边也有demo代码，大家能够学习一下。

#include "ftk.h"

static const char* buttons1[] = {"Yes", NULL};
static const char* buttons2[] = {"Yes", "No", NULL};
static const char* buttons3[] = {"Yes", "No", "Cancel", NULL};
static Ret button_warning(void* ctx, void* obj)
{
	int ret = ftk_warning("Warning", "December 31, 2008: patchwork.kernel.org is now available for general use. It is currently only monitoring the Linux Kernel mailing-list, but should be useful to kernel developers in dealing with patches flying across the wire.", buttons1);

	ftk_logd("%s: ret = %d\n", __func__, ret);

	return RET_OK;
}

static Ret button_info(void* ctx, void* obj)
{
	int ret = ftk_infomation("Infomation", "September 19, 2008: mirrors.kernel.org has been flipped over to using our new GeoDNS based bind server (named-geodns). This means that, at the dns query level, our servers will attempt to direct you to the nearest / fastest kernel.org mirror for your request. This means that you no longer have to use mirrors.us.kernel.org or mirrors.eu.kernel.org to generally route you to the right place. This does mean a change to mirrors.kernel.org no longer explicitly pointing at mirrors.us.kernel.org. Additional information on named-geodns will be forth coming, check back here for an addendum soon.", buttons2);

	ftk_logd("%s: ret = %d\n", __func__, ret);
	return RET_OK;
}

static Ret button_question(void* ctx, void* obj)
{
	int ret = ftk_question("Question", "Are you sure to quit?", buttons3);
	ftk_logd("%s: ret = %d\n", __func__, ret);

	return RET_OK;
}

static Ret button_tips(void* ctx, void* obj)
{
	int ret = ftk_tips("The dialog will quit in 3 seconds.");
	ftk_logd("%s: ret = %d\n", __func__, ret);

	return RET_OK;
}

static Ret button_quit(void* ctx, void* obj)
{
	ftk_quit();

	return RET_OK;
}

int FTK_MAIN(int argc, char* argv[])
{
	int y = 0;
	int width = 0;
	int height = 0;
	FtkWidget* win = NULL;
	FtkWidget* button = NULL;

	ftk_init(argc, argv);
		
	win = ftk_app_window_create();
	width = ftk_widget_width(win);
	height = ftk_widget_height(win);

	y = (height - 240)/2;
	y = y > 0 ? y : 0;

	button = ftk_button_create(win, 0, y, width/2, 50);
	ftk_widget_set_text(button, "question");
	ftk_button_set_clicked_listener(button, button_question, win);
	
	button = ftk_button_create(win, width/2, y, width/2, 50);
	ftk_widget_set_text(button, "warning");
	ftk_button_set_clicked_listener(button, button_warning, win);
	
	button = ftk_button_create(win, 0, y+60, width/2, 50);
	ftk_widget_set_text(button, "info");
	ftk_button_set_clicked_listener(button, button_info, win);

	button = ftk_button_create(win, width/2, y+60, width/2, 50);
	ftk_widget_set_text(button, "tips");
	ftk_button_set_clicked_listener(button, button_tips, win);
	
	button = ftk_button_create(win, width/4, y+120, width/2, 50);
	ftk_widget_set_text(button, "quit");
	ftk_button_set_clicked_listener(button, button_quit, win);

	ftk_widget_set_text(win, "message box demo");
	ftk_widget_show_all(win, 1);
	ftk_widget_set_attr(win, FTK_ATTR_QUIT_WHEN_CLOSE);

	ftk_run();

	return 0;
}

    代码流程和之前的编写方法一样。从代码中看去，有5个button，每一个button都有自己的回调函数。这5个函数各自是button_warning、button_info、button_question、button_tips、button_quit。那回调函数中做了什么呢？

    抛开button_quit，我们仅仅要看其它4个button的回调函数。函数各自是ftk_warning、ftk_info、ftk_question、ftk_tips。除了最后一个ftk_tips，你会发现其它3个函数都是3个參数。參数1为标题，參数2为内容，參数3为button形式。这样的消息框中button有多种形式，有两个button的，有三个button的，须要依据详细情况而定。

    欲看效果怎样，仅仅好等下一篇文章了。