ftk学习记（list篇）

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在開始今天的list主题之前，先看一下icon的执行效果。

今天说的list事实上和这个icon几乎相同。大家仅仅须要把这些icon想像成一条一条的item就能够了。相同，list的demo代码中也会有一个more的button，每次单击一下。就会添加几个item。闲话不多说，先看一下demo代码是怎么样的。

#include "ftk.h"

#include "ftk_list_view.h"
#include "ftk_list_render_default.h"
#include "ftk_list_model_default.h"

#define IDC_TEST_BUTTON 1000
int g_index = 0;
FtkBitmap*  left_icon = NULL;
FtkBitmap* right_icon = NULL;

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

	return RET_OK;
}

static Ret button_more_clicked(void* ctx, void* obj)
{
	int i = 0;
	char text[32] = {0};
	FtkListItemInfo info = {0};
	FtkListModel* model = ctx;

	for(i = 0; i < 4; i++)
	{
		g_index++;
		ftk_snprintf(text, sizeof(text), "item%04d", g_index);
		info.text = (text);
		info.left_icon = left_icon;
		info.right_icon = right_icon;
		info.type = g_index%4;
		ftk_list_model_add(model, &info);
	}

	return RET_OK;
}

Ret on_item_clicked(void* ctx, void* list)
{
	FtkListItemInfo* info = NULL;
	FtkListModel* model = ftk_list_view_get_model(list);
	int i = ftk_list_view_get_selected(list);

	ftk_list_model_get_data(model, i, (void**)&info);
	if(info != NULL)
	{
		info->state = !info->state;
	}
	ftk_logd("%s: %d/%d\n", __func__,
		ftk_list_view_get_selected(list),
		ftk_list_model_get_total(model));

	return RET_OK;
}

int FTK_MAIN(int argc, char* argv[])
{
	int width = 0;
	int height = 0;
	char text[32] = {0};
	FtkWidget* win = NULL;
	FtkWidget* button = NULL;
	FtkWidget* list = NULL;
	FtkListModel* model = NULL;
	FtkListRender* render = NULL;
	FtkListItemInfo info = {0};
	char filename[FTK_MAX_PATH+1] = {0};
	ftk_init(argc, argv);

	win = ftk_app_window_create();
	width = ftk_widget_width(win);
	height = ftk_widget_height(win);

	list = ftk_list_view_create(win, 10, 5, width - 20, 3 * height/4-5);
	ftk_list_view_set_clicked_listener(list, on_item_clicked, NULL);

	model = ftk_list_model_default_create(10);
	render = ftk_list_render_default_create();
	ftk_snprintf(filename, FTK_MAX_PATH, "%s/alarm/%s",TESTDATA_DIR, FTK_STOCK_IMG_SUFFIX);
	left_icon = ftk_bitmap_factory_load(ftk_default_bitmap_factory(), filename);
	ftk_snprintf(filename, FTK_MAX_PATH, "%s/search/%s",  TESTDATA_DIR, FTK_STOCK_IMG_SUFFIX);
	right_icon = ftk_bitmap_factory_load(ftk_default_bitmap_factory(), filename);

	g_index = 0;
	for(g_index = 0; g_index < 4; g_index++)
	{
		ftk_snprintf(text, sizeof(text), "item%04d", g_index);
		info.text = (text);
		info.left_icon = left_icon;
		info.right_icon = right_icon;
		info.type = g_index%4;
		ftk_list_model_add(model, &info);
	}

	ftk_list_view_init(list, model, render, 40);
	ftk_list_model_unref(model);

	button = ftk_button_create(win, width/4, 3 * height/4 + 5, width/4, 60);
	ftk_widget_set_text(button, "more");
	ftk_button_set_clicked_listener(button, button_more_clicked, model);

	button = ftk_button_create(win, width/2, 3 * height/4 + 5, width/4, 60);
	ftk_widget_set_text(button, "quit");
	ftk_button_set_clicked_listener(button, button_quit_clicked, win);
	ftk_window_set_focus(win, button);

	ftk_widget_set_text(win, "list view demo");
	ftk_widget_show_all(win, 1);
	ftk_widget_set_attr(win, FTK_ATTR_QUIT_WHEN_CLOSE);

	ftk_run();

	return 0;
}

细细看来，代码的流程很眼熟。

大家能够把注意力集中到list、model、render和info这几个变量上。当中，尤其须要注意的是list和info。list提供了一个显示空间，而info则用来表示每个list的item。当然，每个list item被选中的时候，on_item_clicked函数都会被调用。当然。除此之外系统也创建了两个button，两个callback函数各自是button_quit_clicked和button_more_clicked。详细的细节分析一下代码就可以。

好了。说了这么多，还是等着看下次的执行效果吧。