在前一阵子，我在网上找到了这个相册DEMO，其不仅支持图相册图片的顺(逆)序浏览，还支持简单的图
片处理（放大缩小Zoom，旋转Rotate，透明Transparency），在图片上打水印以及使用Ink在图片上涂鸭。
在线演示:
http://silverlight.services.live.com/invoke/72193/ImageSnipperV2/iframe.html
下面就是它的一些演示截图。
首先是缩放，旋转和透明处理：
然后是文字水印处理：
然后是使用Ink的涂鸭：
相信做为一个相册（图片浏览）的基本功能已经没什么问题了。
下面来看一下这个DEMO的类图，如下：
上图中的左半部用红框标识的区域是其控件设计类，因为本DEMO中所使用的控件如：按钮，滑动条，
复选框等均未使用Silverlight中所提供的控件，而是自己绘制并定义事件。因此这是我对该DEMO感兴趣的
另一个原因。而右侧则是一些工具类或图片处理类，如处理图片移动的MovableImage和TextBlock移动的
MovableTextBlock等。
下面先简要介绍一下其中的button按钮控件的设计思路。因为其继承自buttonBase，所以有必要先看
一下buttonBase的代码声明，下面是xaml中的内容：
< ControlTemplate xmlns ="http://schemas.microsoft.com/clIEnt/2007"
xmlns:x ="http://schemas.microsoft.com/winfx/2006/xaml" >
< GrID x:name ="Part_Root" MouseEnter ="btnClearMouseEnter" MouseLeave ="btnClearMouseLeave"
MouseleftbuttonDown ="btnClearMouseDown" MouseleftbuttonUp ="btnClearMouseUp" >
< GrID.Resources >
< Storyboard x:name ="Part_MouseEnter" />
< Storyboard x:name ="Part_MouseDown" />
< Storyboard x:name ="Part_MouseUp" />
< Storyboard x:name ="Part_MouseLeave" />
</ GrID.Resources >
< Rectangle x:name ="Part_BackgroundRect" />
< TextBlock x:name ="Part_Caption" />
< Rectangle x:name ="Part_ForegroundRect" />
< Rectangle x:name ="Part_HighlightRect" />
</ GrID >
</ ControlTemplate >
从上面代码可以看出其采用控件模版的方式进行定义。但其鼠标在按钮上移入移出等状态的Storyboard
（故事板）并未进行定义。而肯体的实现被放在了相应的子类(button.xaml和Repeatbutton.xaml)进行实现。
下面就是其中的button.xaml内容：
< ControlTemplate xmlns ="http://schemas.microsoft.com/clIEnt/2007"
xmlns:x ="http://schemas.microsoft.com/winfx/2006/xaml" >
< GrID x:name ="Part_Root" MouseEnter ="btnClearMouseEnter" MouseLeave ="btnClearMouseLeave"
MouseleftbuttonDown ="btnClearMouseDown" MouseleftbuttonUp ="btnClearMouseUp" >
< GrID.Resources >
< Storyboard x:name ="Part_MouseEnter" >
< colorAnimation Duration ="00:00:00.25" To ="#3DFFFFFF" Storyboard.Targetname ="Part_HighlightRect"
Storyboard.TargetProperty ="(Shape.Fill).(SolIDcolorBrush.color)" />
</ Storyboard >
< Storyboard x:name ="Part_MouseDown" >
< colorAnimation Duration ="00:00:00.2" To ="#22000000" Storyboard.Targetname ="Part_HighlightRect"
Storyboard.TargetProperty ="(Shape.Fill).(SolIDcolorBrush.color)" />
</ Storyboard >
< Storyboard x:name ="Part_MouseUp" >
< colorAnimation Duration ="00:00:00.2" To ="#3DFFFFFF" Storyboard.Targetname ="Part_HighlightRect"
Storyboard.TargetProperty ="(Shape.Fill).(SolIDcolorBrush.color)" />
</ Storyboard >
< Storyboard x:name ="Part_MouseLeave" >
< colorAnimation Duration ="00:00:00.25" To ="#00FFFFFF" Storyboard.Targetname ="Part_HighlightRect"
Storyboard.TargetProperty ="(Shape.Fill).(SolIDcolorBrush.color)" />
</ Storyboard >
</ GrID.Resources >
< Rectangle x:name ="Part_BackgroundRect" strokeThickness ="4" RadiusX ="16" RadiusY ="36" stroke ="#46000000" >
< Rectangle.Fill >
< linearGradIEntBrush EndPoint ="0.5,-0.4" StartPoint ="0.5,1.4" >
< GradIEntStop color ="Gray" Offset ="0.242" />
< GradIEntStop color ="DarkBlue" Offset ="0.333" />
</ linearGradIEntBrush >
</ Rectangle.Fill >
</ Rectangle >
< TextBlock x:name ="Part_Caption" VerticalAlignment ="Center" HorizontalAlignment ="Center"
Foreground ="Gold" Text ="button" >
< TextBlock.Rendertransform >
< Translatetransform X ="0" Y ="-2" />
</ TextBlock.Rendertransform >
</ TextBlock >
< Rectangle x:name ="Part_ForegroundRect" VerticalAlignment ="top" strokeThickness ="4" RadiusX ="16"
RadiusY ="36" WIDth ="124" Height ="32" >
< Rectangle.Fill >
< linearGradIEntBrush EndPoint ="0.5,-0.409" StartPoint ="0.5,1.409" >
< GradIEntStop color ="#00FFFFFF" Offset ="0.13" />
< GradIEntStop color ="#FFFFFFFF" Offset ="1" />
</ linearGradIEntBrush >
</ Rectangle.Fill >
</ Rectangle >
< Rectangle VerticalAlignment ="top" RadiusX ="16" RadiusY ="36" Fill ="#00FFFFFF" x:name ="Part_HighlightRect" />
</ GrID >
</ ControlTemplate >
注：这样设计方式本人感觉很有意思，很有“面向对象”的味道，呵呵。
下面简要浏览一下buttonBase.xaml.cs的代码：
[TemplatePart(name = " Part_Root " , Type = typeof (Panel))]
[TemplatePart(name = " Part_Caption " , Type = typeof (TextBlock))]
[TemplatePart(name = " Part_ForegroundRect " , Type = typeof (Rectangle))]
[TemplatePart(name = " Part_BackgroundRect " , Type = typeof (Rectangle))]
[TemplatePart(name = " Part_HighlightRect " , Type = typeof (Rectangle))]
[TemplatePart(name = " Part_MouseEnter " , Type = typeof (Storyboard))]
[TemplatePart(name = " Part_MouseLeave " , Type = typeof (Storyboard))]
[TemplatePart(name = " Part_MouseDown " , Type = typeof (Storyboard))]
[TemplatePart(name = " Part_MouseUp " , Type = typeof (Storyboard))]
public abstract partial class buttonBase : Control
{
/// <summary>
/// 定义单击事件
/// </summary>
public event EventHandler Click;
/// <summary>
/// 执行单击事件的绑定方法
/// </summary>
protected voID OnClick()
{
if (Click != null )
{
Click( this , new EventArgs());
}
}
/// <summary>
/// 标题属性
/// </summary>
public string Caption
{
get { return this .Part_Caption.Text; }
set { this .Part_Caption.Text = value; }
}
/// <summary>
/// 鼠标移入控件区域时启动Part_MouseEnter故事板，下面类似
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected virtual voID Part_Root_MouseEnter( object sender, MouseEventArgs e)
{
Part_MouseEnter.Begin();
}
protected virtual voID Part_Root_MouseLeave( object sender, MouseEventArgs e)
{
Part_MouseLeave.Begin();
}
protected virtual voID Part_Root_MouseleftbuttonDown( object sender, MousebuttonEventArgs e)
{
Part_MouseDown.Begin();
}
protected virtual voID Part_Root_MouseleftbuttonUp( object sender, MousebuttonEventArgs e)
{
Part_MouseUp.Begin();
// 执行单击事件的绑定方法
OnClick();
}
protected Storyboard Part_MouseEnter, Part_MouseDown, Part_MouseLeave, Part_MouseUp;
protected Rectangle Part_ForegroundRect, Part_BackgroundRect, Part_HighlightRect;
protected Panel Part_Root;
protected TextBlock Part_Caption;
}
其实上面的代码与我们平时写.net控件类似，也是属性事件的定义。当然不同的地方就是对故事板的使用，
而故事板会让我们的按钮在鼠标触发事件时在UI上看起来更酷。当然下面还要看一下相应的button中的内容，因
为这才是实际运行时使用的控件，其代码如下：
public partial class button : buttonBase
{
public button()
{
// 加载button.xaml中的内容，为下面获取元素进行相应 *** 作
string xaml = ResourceHelper.GetTemplate( this .GetType());
ControlTemplate template = (ControlTemplate)XamlReader.Load(xaml);
this .Template = template;
this .ApplyTemplate();
}
/// <summary>
/// 对当前模板(xaml)中的元素进行（主要是鼠标）事件绑定
/// </summary>
public overrIDe voID OnApplyTemplate()
{
Part_Root = (Panel)GetTemplateChild( " Part_Root " );
Part_Caption = (TextBlock)GetTemplateChild( " Part_Caption " );
Part_ForegroundRect = (Rectangle)GetTemplateChild( " Part_ForegroundRect " );
Part_BackgroundRect = (Rectangle)GetTemplateChild( " Part_BackgroundRect " );
Part_HighlightRect = (Rectangle)GetTemplateChild( " Part_HighlightRect " );
Part_MouseEnter = (Storyboard)GetTemplateChild( " Part_MouseEnter " );
Part_MouseLeave = (Storyboard)GetTemplateChild( " Part_MouseLeave " );
Part_MouseDown = (Storyboard)GetTemplateChild( " Part_MouseDown " );
Part_MouseUp = (Storyboard)GetTemplateChild( " Part_MouseUp " );
Part_Root.SizeChanged += new SizeChangedEventHandler(Part_Root_SizeChanged);
Part_Root.MouseEnter += new MouseEventHandler(Part_Root_MouseEnter);
Part_Root.MouseLeave += new MouseEventHandler(Part_Root_MouseLeave);
Part_Root.MouseleftbuttonDown += new MousebuttonEventHandler(Part_Root_MouseleftbuttonDown);
Part_Root.MouseleftbuttonUp += new MousebuttonEventHandler(Part_Root_MouseleftbuttonUp);
}
/// <summary>
/// 按钮的实际高度或宽度发生变化时的处理事件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
voID Part_Root_SizeChanged( object sender, SizeChangedEventArgs e)
{
Part_ForegroundRect.WIDth = Part_Root.ActualWIDth - 16d;
Part_ForegroundRect.Height = Part_Root.ActualHeight - 12d;
Part_HighlightRect.WIDth = Part_Root.ActualWIDth - 10d;
Part_HighlightRect.Height = Part_Root.ActualHeight - 8d;
if (Part_Root.ActualWIDth > Part_Root.ActualHeight)
{
Part_BackgroundRect.RadiusX = Part_ForegroundRect.RadiusX = Part_HighlightRect.RadiusX =
Part_Root.ActualHeight / 2d;
Part_BackgroundRect.RadiusY = Part_ForegroundRect.RadiusY = Part_HighlightRect.RadiusY =
Part_Root.ActualWIDth / 4d;
}
else
{
Part_BackgroundRect.RadiusX = Part_ForegroundRect.RadiusX = Part_HighlightRect.RadiusX =
Part_Root.ActualHeight / 4d;
Part_BackgroundRect.RadiusY = Part_ForegroundRect.RadiusY = Part_HighlightRect.RadiusY =
Part_Root.ActualWIDth / 2d;
}
}
}
到这里还有另一个按钮控件Repeatbutton没有介绍，其实它的内容也上面的button代码相似，所以就不多介绍了。
当然Repeatbutton最终的用处是被放在了ImageSelector控件中做为子控制被加载，这其中与我们开发“复合型”控件
相似。
下面就是button控制的运行效果，如下所示：
当然这个DEMO在控件开发上还有一些有特色的地方，比如CheckBox控件等，我会在接下来的文章中加以说明，
呵呵。
好了，今天的内容就先到这里了。
tag:silverlight,button,imagesnipper
作者:代震军,daizhj
原文链接:http://www.cnblogs.com/daizhj/archive/2008/09/01/1281204.html
源码下载，请点击这里:)
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