MTK架构及系统原理Gimon.pptVIP

人机界面-简述 UI Layer（界面处理） 提供了用户界面功能，应用 UI 层包含的元素 Category Screens 封装各种屏幕的显示函数 处理资源，如字符串ID和图像显示的 保持独立的布局和外观屏幕的应用程序 提供history接口 人机界面-简述 UI Elements 这一层提供了显示能力和使用各种用户界面元素，如按钮，滚动条，菜单等 这些是界面中的控件 Themes 负责实施一套固定的外观和感觉功能的用户界面元素 Themes consist of 物体形状和颜色 字体使用( Font type, style, text color ) 其他显示属性 人机界面-简述 Fonts 这是数据所使用的是图形库，显示屏幕上的字符 Images 一套独立的图像设备 如： Icons, Splash screens and Wallpapers Graphics Library （图形库） 提供图形元 包含显示字体和图像的功能 下面介绍一下模块的架构及其应用 handler Framework Layer Event Handlers – Provides API for application to manage event handlers at run time. Keyboard Event handlers API – Typically used by applications and category functions Set key handler for particular key Set Key handler for group of keys Execute current key handler for key press event Clear key handlers for particular key Clear key handlers for all keys Special handling for Power and End Key handler Protocol Event Handler API – Typically used by applications Set protocol event handler. Execute Current protocol event handler. Clear handler for specific protocol event. Clear all protocol event handler. Misc. Handlers Exit Handlers Set Exit handler for particular screen Execute Exit handler for current screen Clear Current exit handler history History Database containing snapshots of screen Implemented as a non default LIFO Structure of history node Screen ID - of screen to be saved Entry Function Pointer – to redraw the screen Input Buffer – to save running text data for this screen GUI Buffer – to save UI related information for this screen history History API Add Node to History Delete ‘N’ nodes from history Go back ‘N’ nodes in history Retrieve history for a screen Retrieve input buffer for screen Retrieve UI buffer for screen Dump History for debugging Initialize history Subtle facts about history Is implemented as stack First screen saved after boot up is never removed New Nodes are added to the head of history OSL Layer OSL Layer Provides abstraction over system calls to make MMI portable Following Kern