LFTK中的界面描述数据

LFTK可以直接加载XML格式的和二进制格式的界面描述数据，从性能和资源开销的角度考虑，二进制格式是更好的选择，LFTK提供了工具将XML格式转换成二进制格式的界面描述数据，也提供了将QT的UI文件和微软的RC文件转换成LFTK XML格式的界面描述文件的工具，其工作流程如下：

LFTK的UI Builder还在意淫之中，打算用LFTK本身来开发，可能需要等到2018年底了，目前可以使用Qt Designer或微软的VC来做界面(主要生成各个控件的坐标)，再转换成LFTK XML UI文件，适当的编辑之后，转换成LFKT二进制的UI数据。

一、界面描述数据的使用方法

1.创建XML格式的界面描述文件

LFTK XML界面描述数据非常紧凑和直观：

name 是控件的名称，创建完成之后可以用widget_look_up函数找到指定名称的控件。
x x坐标
y y坐标
w 宽度
h 高度
text 文本
value 值

x/y/w/h 可以使用LFTK的layout参数。

<window name="main" x="0" y="0" w="320" h="480">
  <button name="inc" x="10" y="5" w="40%" h="30" text="Inc"/>
  <button name="dec" x="right:10" y="5" w="40%" h="30" text="Dec"/>
  <image name="img" x="10" y="230" w="100" h="100"/>
  <label name="" x="10" y="40" w="80" h="30" text="Left"/>
  <label name="" x="100" y="40" w="80" h="30" text="Center"/>
  <label name="" x="200" y="40" w="80" h="30" text="Right"/>
  <progress_bar name="bar1" x="10" y="80" w="168" h="30" value="40"/>
  <progress_bar name="bar2" x="260" y="80" w="30" h="118" value="20" vertical="true"/>
  <check_button name="c1" x="10" y="150" w="80" h="30" text="Book"/>
  <check_button name="c2" x="100" y="150" w="80" h="30" text="Food"/>
  <radio_button name="r1" x="10" y="200" w="80" h="30" text="Book"/>
  <radio_button name="r2" x="100" y="200" w="80" h="30" text="Food"/>
  <radio_button name="r3" x="190" y="200" w="80" h="30" text="Pencil" value="true"/>
  <button name="dialog" x="10" y="260" w="40%" h="30" text="Dialog"/>
  <button name="dialog2" x="right:10" y="260" w="40%" h="30" text="Dialog2"/>
</window>

2.预览XML格式的界面描述文件

XML UI文件写好后，可以用预览工具预览。如：

./demos/prefix_xml_ui tools/ui_gen/xml_to_ui/window1.xml

3.转换成二进制格式的界面描述文件

对XML预览的效果满意之后，把它转换成二进制的格式：

 cd tools/ui_gen/xml_to_ui
 ./xml_to_ui window1.xml window1.data

为了方便在没有文件系统的嵌入式系统中使用，直接生成常量数据，和程序一起编译。如：

  1 const unsigned char ui_window1[] = {
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4.使用二进制格式的界面描述文件

在程序中引用，并放入资源管理器中：

#include "res/ui/window1.data"
...

resource_manager_add((const resource_info_t*)ui_window1);

在需要打开该窗口时，调用window_open函数(对话框用dialog_open):

  widget_t* win = window_open(name);

  widget_child_on(win, "ok", EVT_CLICK, on_ok, win);
  widget_child_on(win, "cancel", EVT_CLICK, on_cancel, win);

二、将Qt的UI文件转成

转换工具在tools/ui_gen/qt_to_xml目录下，使用方法：

Usage: ./tools/ui_gen/qt_to_xml/qt_to_xml in_filename out_filename
   Ex: ./tools/ui_gen/qt_to_xml/qt_to_xml demo1.ui demo1.xml

三、将Qt的UI文件转成

转换工具在tools/ui_gen/rc_to_xml目录下，使用方法：

Usage: ./tools/ui_gen/rc_to_xml/rc_to_xml rcfile

RC文件需要先转换成UTF-8编码。

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