WPF界面设计技巧（1）—不规则窗体图文指南

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原文:WPF界面设计技巧（1）—不规则窗体图文指南

初到园子，奉上第一篇入门级教程，请勿见笑。

以往WinForm编程中，实现不规则窗体是有一定难度的，更难的是不规则窗体的边缘抗锯齿及局部透明处理。而现在，WPF的出现使这个问题迎刃而解，使得我们可以轻松、灵活地美化用户界面。

下面就让我们来看看如何实现一个不规则窗体：

首先我们需要借助Microsoft Expression Design 2来进行图形设计。（这里使用Photoshop等传统软件也可以，但是只能利用PNG格式来实现透明，其缺点就是不支持无损缩放，且不支持动态修改。）

打开Microsoft Expression Design 2中文版，点击菜单“文件 > 新建”，依照下图进行设置，这里将文档尺寸单位设为“像素”，便于与应用程序的布局单位相对应。

然后随心所欲的画吧，想画成什么样都行，但注意Microsoft Expression Design 2中绘制的图形并非全部都是矢量的，比如纹理填充、一些特殊笔刷以及滤镜效果(输出时有“将实时效果转换为XAML效果”的选项，但是点了无用，不知道是不是BUG)都会以位图形式输出。

这是我画出来的图形：

这里要注意的是：最好将所有元素都放在一个图层里，因为我们后面导出资源字典的时候需要依据图层来分组，我们画好之后要给图层重命名，在这里我给它命名为“back”，这个名称将在后面代码中引用资源时使用。

接下来点击菜单“文件 > 导出...”，将格式设为“XAML WPF 资源字典”，分组依据设为“层”，实时效果设为“转换为XAML效果”(貌似无用的设置)。然后按“浏览...”按钮选择输出路径，然后按“全部导出”按钮完成导出。

然后就可以保存文件，关闭Microsoft Expression Design 2了。

打开Microsoft Visual Studio 2008，点击菜单“文件 > 新建 > 项目...”，选择“WPF 应用程序”，名称设为“不规则窗体”。

点击菜单“项目 > 添加现有项...”，浏览并选择此前导出的资源字典文件(选的时候注意把右边的文件类型过滤改一下，默认是C#文件类型)。如下图所示，这就是导入的资源字典文件。

引入的资源字典内容如下，我们不需要搞明白这些对图形的描述语法，只要了解其中的“x:Key="back"”对应的是我们之前设计时的图层名称，我们在程序中引用此资源时要使用这个名称。

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现在我们要把这个资源字典引入程序集，打开“App.xaml”文件，添加下图中红色框内的代码。