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cellspacing="1" cellpadding="1" bgcolor="#000000"><tr bgcolor="#FFFFFF"><td width="100%" colspan="4" align="left"><table width="95%" align="center"><tr><td class="font1"><p align="center"><br><font size="3">自 动 隐 藏 的 声 象 按 钮</font><br><span class="nava"><font color="#CC9933">2000-07-13· -·-</font></span></p><p><fontcolor="#ffffff"> </font>随着计算机的日益普及和多媒体技术的不断发展，多媒体计算机辅助教学（MCAI）软件正改变人们传统的学习方式。MCAI软件的操作界面赏心悦目，特别是具有音响效果且能自动隐藏的图象按钮或菜单，图、文、声并茂，确实为软件添色不少，深受用户喜爱。以下介绍用Delphi实现上述功能的技术。<p><fontcolor="#ffffff"> </font><b>准备工作</b><p><fontcolor="#ffffff"> </font>建好应用软件主目录C:\AutoHide及其子目录Images和Sounds。作为软件主界面的背景图象的位图文件Background.bmp，及作为按钮图象的位图Chimera.bmp都存入Images目录中。将声音文件Growl.wav存入Sounds目录。<p><fontcolor="#ffffff"> </font><b>图象按钮</b><p><fontcolor="#ffffff"> </font>1．启动Delphi3.0IDE，新建项目AutoHide.dpr，主窗体单元命名为Main.pas，存入C:\AutoHide目录。在主窗体上放入三个TImage组件，主要属性按表1设置。<p><fontcolor="#ffffff"> </font>表1主窗体和各组件属性设置<pre>组件 属性 设置Form1 Caption AutoHideButtonName MainFormImage1 Align alClientName BackgroundImagePicture (TBitmap)Stretch TrueVisible TrueImage2 Align alNoneName PictureImagePicture (TBitmap)Stretch TrueTransparent TrueVisible FalseImage3 Align alNoneCursor crHandPointName ButtonImagePicture (None)Stretch False</pre><p><fontcolor="#ffffff"> </font>BackgroundImage的Picture属性装入Background.bmp，PictureImage的Picture属性装入Chimera.bmp。ButtonImage重叠于PictureImage之上，置于背景图象的特定位置。<p><fontcolor="#ffffff"> </font>2．建立ButtonImage的OnMouseMove事件，当鼠标移至其上时PictureImage显现：<pre>PictureImage.Visible:=True;</pre><p><fontcolor="#ffffff"> </font>3．建立BackgroundImage的OnMouseMove事件，当鼠标移开ButtonImage时PictureImage隐藏：<pre> PictureImage.Visible:=False;</pre><p><fontcolor="#ffffff"> </font>4．创建ButtonImage（注意：不是PictureImage）的OnClick事件，以响应鼠标点击完成规定动作。不失一般性，在此仅显示一行信息。<pre> MessageBeep($FFFF); ShowMessage('WelcometotheDelphi.');</pre><p><fontcolor="#ffffff"> </font>5．编译、运行。软件启动后进入主界面，在背景⌨️ 快捷键说明
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