【正文】 desktop management capabilities ． The particular partition of the centric graphical operation layer,核心是提供中心的圖形操作功能，如消息機(jī)制，圖形設(shè)備接口，字體，窗口和桌面管理功能，中心的圖形操作層的核心模塊的特定分區(qū)如圖3所示。Core module is shown as in figure 3 ．控制庫(kù)圖形資源核心機(jī)制模塊LALGAL初始化桌面子模塊驅(qū)動(dòng)模塊定時(shí)器圖 3．中心的圖形操作層結(jié)構(gòu)LAL and GAL is separately the hardware device input abstraction layer and the graphics output abstraction layer ， which are connected with the underlying inputoutput device to facilitate the GUI to connect different input and outpLAL和GAL是單獨(dú)的硬件設(shè)備輸入抽象層和圖形輸出抽象層,這是基本輸入輸出設(shè)備，以方便GUI連接到不同的輸入和輸出devices ， to achieve good portability and versatility of the GUI system ．設(shè)備,以達(dá)到良好的可移植性和GUI系統(tǒng)的多功能性。B. Core mechanism design and The core mechanism module is the most important ponent of the embedded GUI system, including message and eventdriven mechanism ， desktop operations predefined stack, initialization, and timer operation several submodules ， the follows will briefly introduce the functions of several submodule核心機(jī)制模塊是嵌入式GUI系統(tǒng)的最重要組成部分，包括消息和事件驅(qū)動(dòng)機(jī)制，桌面操作預(yù)先定義的堆棧，初始化，定時(shí)器操作等幾個(gè)子模塊，以下將簡(jiǎn)要介紹這幾個(gè)子功能模塊。 C Message and eventdriven mechanism submoduC消息和事件驅(qū)動(dòng)機(jī)制的子模塊 This submodule is mainly responsible far message receiving, distribution and routing operations ．該子模塊主要負(fù)責(zé)消息接收，分配和路由操作。1) Message queue initialization: considering the defects of the multimessage queue GUI system in system overhead and resource consumption, and there are usually very little interaction between the graphical user interface and realtime control tasks in a embedded system, so the GUI in this paper is a single message queue architecture ． The GUI system will initialize the message queue when beginning running to make it in a normal work state ．1）消息隊(duì)列初始化：考慮到多消息隊(duì)列GUI系統(tǒng)開銷和資源消耗的系統(tǒng)缺陷，通常有很少的互動(dòng)關(guān)系的圖形用戶界面和實(shí)時(shí)控制任務(wù)，因此GUI本是一個(gè)單一的消息隊(duì)列架構(gòu)。當(dāng)運(yùn)行在正常工作狀態(tài)時(shí)，GUI系統(tǒng)將初始化消息隊(duì)列 。 2) Message cycle: when the windows, controls the application created have been pletely displayed on the screen, to enter the message loop waiting for input events, and the message cycle flow as shown in figure 2）消息循環(huán)：當(dāng)控制應(yīng)用程序窗口和控件創(chuàng)建已經(jīng)完全顯示在屏幕上，進(jìn)入消息循環(huán)，等待輸入事件，消息循環(huán)流如圖4所示。 獲取信息信息類型識(shí)別消息數(shù)據(jù)分析消息數(shù)據(jù)分布是否輸出消息結(jié)束是否圖 4 消息循環(huán)流程圖3) Message distribution: after the messages removed from the message queue, they will be distributed to the corresponding window or control, to be responded by their 3）消息分布：從消息隊(duì)列中刪除消息后，他們將被分配到相應(yīng)的窗口或控件，被他們消息處理函數(shù)響應(yīng)。message processing function ． D. Desketop submoduD. Desktop子模塊 Desktop is a very important part of the GUT system, which is equivalent to a bottom window ， all the main windows are covered On it, also it preserves many global桌面是非常重要的圖形用戶界面系統(tǒng)的一部分，這相當(dāng)于一個(gè)底部窗口，它涵蓋了所有主要的窗口，也保留了許多全球業(yè)務(wù)在GUI中，如輸入消息的分布；增加影響的主要窗口的處理。此外，顯示，刪除，移動(dòng)和其他對(duì)環(huán)境的業(yè)務(wù)，并完成相應(yīng)的映射操作，通過(guò)分布的PAINT的相關(guān)消息，調(diào)用窗口模塊或GUI模塊的功能 。l) Window addition: when the user creating a main window in the calling system API, in addition to setting its own character attribute value, also the related system information will be changed, for example, there is overlapping relationship between the new main window and the existing main window, which will be related to the operation of the Z order list: and the new added main window will lead to the change of the existing main window cut information ．1）窗口添加：除了設(shè)定自己的屬性值，當(dāng)用戶在調(diào)用系統(tǒng)API創(chuàng)建一個(gè)主窗口時(shí)，相關(guān)系統(tǒng)的信息也將被改變，例如：新的主窗口和現(xiàn)有的主窗口之間有重疊的關(guān)系，這將關(guān)系到Z序列表的操作：新增加的主窗口將導(dǎo)致現(xiàn)有的主要窗口削減信息的變化。operations in the GUI ． such as the distribution of input messages ； processing the impact of the main window addition, display ， deletion, movement and other operations on the environment, and the pletion of the corresponding mapping operations through the distribution of the PAINT related news, calling the window module or GDI module functions ．2) Window deletion: in the GUI, it is often needed to delete a main window, for example, the dialog is occurred in the form of main window, so when it will be closed it should be deleted and users may have to independently remove a main window ． The window module provides the function to delete the window through system calling, and ultimately sends MEG_REMOVEMAINWIN message to the desktop ．2）窗口刪除：在GUI中它往往需要?jiǎng)h除一個(gè)主窗口，例如，對(duì)話框在主窗口的形式出現(xiàn)，所以它將被關(guān)閉，它應(yīng)該被刪除，用戶可能有獨(dú)立刪除一個(gè)主窗口。窗口模塊提供的功能來(lái)刪除通過(guò)系統(tǒng)調(diào)用的窗口，到桌面最終發(fā)送MEG_REMOVEMAINWIN的消息。 To move a main window to the top laver ． it needs to display the part originally covered by other windows, and then update the impact of the movement on other window 若要移動(dòng)主要窗口到頂端。需要顯示其他窗口被遮住的部分，然后更新目標(biāo)窗口的移動(dòng)對(duì)其他窗口的影響以及系統(tǒng)變量 。 and system variables ．3) Window display: window module provides system call a GUI window show function, when setting its mand parameter is SW_SHOW, a window orig3）窗口顯示：窗口模塊提供系統(tǒng)調(diào)用GUI窗口顯示功能，其命令參數(shù)設(shè)置初始值是SW_SHOW時(shí)，窗口顯示為無(wú)法看到。For the main window, it actually is to send a MSG_SHOWMAINWIN message to the desktop ．對(duì)于主窗口，它實(shí)際上是發(fā)送MSG_SHOWMAINWIN消息到桌面。 4) Window movement: one of the basic requirements of the GUI system is that the window can be dragged so the window module provides a system call a GUI window sh4）窗口移動(dòng)：GUI系統(tǒng)的基本要求之一是可以拖動(dòng)窗口，為窗口模塊提供了一個(gè)系統(tǒng)調(diào)用GUI窗口顯示函數(shù)來(lái)完成這個(gè)功能，和發(fā)送MSG_SHOWMAINWIN消息could not see can be 。function to plete this function, and send MSG_SHOWMAINWIN message to the desktoE. Initialization on It is a basic GUI system module ， and the beginning of each GUI operation will carry out set and initialization operations for the entire GUI environment parameters through the API function of this module ．這是一個(gè)基本的GUI系統(tǒng)模塊，每個(gè)GUI操作的開始均是通過(guò)這個(gè)模塊的API函數(shù)開展整個(gè)GUI環(huán)境參數(shù)的設(shè)置和初始化操作。 Initialization module only provides an overall GUI initialization function and a clearance function when terminating the GUI, thus the GUI entrance function 當(dāng)要終止