超炫酷的WPF实现Loading控件效果

win8系统的loading效果还是很不错的，网上也有人用css3等技术实现，研究了一下，并打算用wpf自定义一个loading控件实现类似的效果，并可以让用户对loading的颗粒（particle）背景颜色进行自定义，话不多说，直接上代码：

1、用vs2012新建一个wpf的用户控件库项目wpfcontrollibrarydemo，vs自动生成如下结构：

2、删除usercontrol1.xaml，并新建一个loading的customcontrol(不是usercontrol),如下图所示：

3、如果报错找不到loading类型，请编译，下面在generic.xaml主题文件中对loading的样式和内容进行定义（注意添加

xmlns:system = "clr-namespace:system;assembly=mscorlib"），代码如下：
<resourcedictionary
 xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
 xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
 xmlns:system = "clr-namespace:system;assembly=mscorlib"
 xmlns:local="clr-namespace:wpfcontrollibrarydemo">


 <style targettype="{x:type local:loading}">
 <setter property="template">
  <setter.value>
  <controltemplate targettype="{x:type local:loading}">
   <border background="{templatebinding background}"
    borderbrush="{templatebinding borderbrush}"
    borderthickness="{templatebinding borderthickness}">
   <grid width = "50" height = "50">
    <grid.resources>
    <!-- value converters -->
    
    <!-- particle styling ,must to has relativesource -->
    <solidcolorbrush x:key = "particlecolor" color = "{binding path=fillcolor,relativesource={relativesource templatedparent}}" />
    <solidcolorbrush x:key = "particlebackgroundcolor" color = "transparent"/>
    <system:double x:key = "particleopacity">1</system:double>
    <system:double x:key = "particleradius">5</system:double>

    <system:double x:key = "startingpointx">0</system:double>
    <system:double x:key = "startingpointy">-20</system:double>

    <system:double x:key = "rotationpointx">0.5</system:double>
    <system:double x:key = "rotationpointy">0.5</system:double>

    <!-- storyboard -->
    <system:timespan x:key = "storyboardbegintimep0">00:00:00.000</system:timespan>
    <system:timespan x:key = "storyboardbegintimep1">00:00:00.100</system:timespan>
    <system:timespan x:key = "storyboardbegintimep2">00:00:00.200</system:timespan>
    <system:timespan x:key = "storyboardbegintimep3">00:00:00.300</system:timespan>
    <system:timespan x:key = "storyboardbegintimep4">00:00:00.400</system:timespan>
    <duration x:key = "storyboardduration">00:00:01.800</duration>

    <!-- particle origin angles -->
    <system:double x:key = "particleoriginanglep0">0</system:double>
    <system:double x:key = "particleoriginanglep1">-10</system:double>
    <system:double x:key = "particleoriginanglep2">-20</system:double>
    <system:double x:key = "particleoriginanglep3">-30</system:double>
    <system:double x:key = "particleoriginanglep4">-40</system:double>

    <!-- particle position & timing 1 -->
    <system:double x:key = "particlebeginangle1">0</system:double>
    <system:double x:key = "particleendangle1">90</system:double>
    <system:timespan x:key = "particlebegintime1">00:00:00.000</system:timespan>
    <duration x:key = "particleduration1">00:00:00.750</duration>

    <!-- particle position & timing 2 -->
    <system:double x:key = "particlebeginangle2">90</system:double>
    <system:double x:key = "particleendangle2">270</system:double>
    <system:timespan x:key = "particlebegintime2">00:00:00.751</system:timespan>
    <duration x:key = "particleduration2">00:00:00.300</duration>

    <!-- particle position & timing 3 -->
    <system:double x:key = "particlebeginangle3">270</system:double>
    <system:double x:key = "particleendangle3">360</system:double>
    <system:timespan x:key = "particlebegintime3">00:00:01.052</system:timespan>
    <duration x:key = "particleduration3">00:00:00.750</duration>

    <style x:key = "ellipsestyle" targettype = "ellipse">
     <setter property = "width" value = "{staticresource particleradius}"/>
     <setter property = "height" value = "{staticresource particleradius}"/>
     <setter property = "fill" value = "{staticresource particlecolor}"/>
     <setter property = "rendertransformorigin" value = "0.5, 0.5"/>
     <setter property = "opacity" value = "{staticresource particleopacity}"/>
    </style>
    </grid.resources>
    <canvas width = "1" height = "1" margin="0,0,0,0">
    <canvas.triggers>
     <eventtrigger routedevent = "canvas.loaded">
     <eventtrigger.actions>
      <beginstoryboard>
      <storyboard
    
    begintime = "{staticresource storyboardbegintimep0}"
    duration = "{staticresource storyboardduration}"
    repeatbehavior = "forever">
       <doubleanimation
    storyboard.targetname = "p0"
    storyboard.targetproperty = "(uielement.rendertransform).(rotatetransform.angle)"
    from = "{staticresource particlebeginangle1}"
    to = "{staticresource particleendangle1}"
    begintime = "{staticresource particlebegintime1}"
    duration = "{staticresource particleduration1}"/>
       <doubleanimation
    storyboard.targetname = "p0"
    storyboard.targetproperty = "(uielement.rendertransform).(rotatetransform.angle)"
    from = "{staticresource particlebeginangle2}"
    to = "{staticresource particleendangle2}"
    begintime = "{staticresource particlebegintime2}"
    duration = "{staticresource particleduration2}"/>
       <doubleanimation
    storyboard.targetname = "p0"
    storyboard.targetproperty = "(uielement.rendertransform).(rotatetransform.angle)"
    from = "{staticresource particlebeginangle3}"
    to = "{staticresource particleendangle3}"
    begintime = "{staticresource particlebegintime3}"
    duration = "{staticresource particleduration3}"/>
      </storyboard>
      </beginstoryboard>
      <beginstoryboard>
      <storyboard
    
    begintime = "{staticresource storyboardbegintimep1}"
    duration = "{staticresource storyboardduration}"
    repeatbehavior = "forever">

       <doubleanimation
    storyboard.targetname = "p1"
    storyboard.targetproperty = "(uielement.rendertransform).(rotatetransform.angle)"
    from = "{staticresource particlebeginangle1}"
    to = "{staticresource particleendangle1}"
    begintime = "{staticresource particlebegintime1}"
    duration = "{staticresource particleduration1}"/>
       <doubleanimation
    storyboard.targetname = "p1"
    storyboard.targetproperty = "(uielement.rendertransform).(rotatetransform.angle)"
    from = "{staticresource particlebeginangle2}"
    to = "{staticresource particleendangle2}"
    begintime = "{staticresource particlebegintime2}"
    duration = "{staticresource particleduration2}"/>
       <doubleanimation
    storyboard.targetname = "p1"
    storyboard.targetproperty = "(uielement.rendertransform).(rotatetransform.angle)"
    from = "{staticresource particlebeginangle3}"
    to = "{staticresource particleendangle3}"
    begintime = "{staticresource particlebegintime3}"
    duration = "{staticresource particleduration3}"/>
      </storyboard>
      </beginstoryboard>
      <beginstoryboard>
      <storyboard
    
    begintime = "{staticresource storyboardbegintimep2}"
    duration = "{staticresource storyboardduration}"
    repeatbehavior = "forever">

       <doubleanimation
    storyboard.targetname = "p2"
    storyboard.targetproperty = "(uielement.rendertransform).(rotatetransform.angle)"
    from = "{staticresource particlebeginangle1}"
    to = "{staticresource particleendangle1}"
    begintime = "{staticresource particlebegintime1}"
    duration = "{staticresource particleduration1}"/>
       <doubleanimation
    storyboard.targetname = "p2"
    storyboard.targetproperty = "(uielement.rendertransform).(rotatetransform.angle)"
    from = "{staticresource particlebeginangle2}"
    to = "{staticresource particleendangle2}"
    begintime = "{staticresource particlebegintime2}"
    duration = "{staticresource particleduration2}"/>
       <doubleanimation
    storyboard.targetname = "p2"
    storyboard.targetproperty = "(uielement.rendertransform).(rotatetransform.angle)"
    from = "{staticresource particlebeginangle3}"
    to = "{staticresource particleendangle3}"
    begintime = "{staticresource particlebegintime3}"
    duration = "{staticresource particleduration3}"/>
      </storyboard>
      </beginstoryboard>

      <beginstoryboard>
      <storyboard
    
    begintime = "{staticresource storyboardbegintimep3}"
    duration = "{staticresource storyboardduration}"
    repeatbehavior = "forever">

       <doubleanimation
    storyboard.targetname = "p3"
    storyboard.targetproperty = "(uielement.rendertransform).(rotatetransform.angle)"
    from = "{staticresource particlebeginangle1}"
    to = "{staticresource particleendangle1}"
    begintime = "{staticresource particlebegintime1}"
    duration = "{staticresource particleduration1}"/>
       <doubleanimation
    storyboard.targetname = "p3"
    storyboard.targetproperty = "(uielement.rendertransform).(rotatetransform.angle)"
    from = "{staticresource particlebeginangle2}"
    to = "{staticresource particleendangle2}"
    begintime = "{staticresource particlebegintime2}"
    duration = "{staticresource particleduration2}"/>
       <doubleanimation
    storyboard.targetname = "p3"
    storyboard.targetproperty = "(uielement.rendertransform).(rotatetransform.angle)"
    from = "{staticresource particlebeginangle3}"
    to = "{staticresource particleendangle3}"
    begintime = "{staticresource particlebegintime3}"
    duration = "{staticresource particleduration3}"/>
      </storyboard>
      </beginstoryboard>

      <beginstoryboard>
      <storyboard
    
    begintime = "{staticresource storyboardbegintimep4}"
    duration = "{staticresource storyboardduration}"
    repeatbehavior = "forever">

       <doubleanimation
    storyboard.targetname = "p4"
    storyboard.targetproperty = "(uielement.rendertransform).(rotatetransform.angle)"
    from = "{staticresource particlebeginangle1}"
    to = "{staticresource particleendangle1}"
    begintime = "{staticresource particlebegintime1}"
    duration = "{staticresource particleduration1}"/>
       <doubleanimation
    storyboard.targetname = "p4"
    storyboard.targetproperty = "(uielement.rendertransform).(rotatetransform.angle)"
    from = "{staticresource particlebeginangle2}"
    to = "{staticresource particleendangle2}"
    begintime = "{staticresource particlebegintime2}"
    duration = "{staticresource particleduration2}"/>
       <doubleanimation
    storyboard.targetname = "p4"
    storyboard.targetproperty = "(uielement.rendertransform).(rotatetransform.angle)"
    from = "{staticresource particlebeginangle3}"
    to = "{staticresource particleendangle3}"
    begintime = "{staticresource particlebegintime3}"
    duration = "{staticresource particleduration3}"/>
      </storyboard>
      </beginstoryboard>
     </eventtrigger.actions>
     </eventtrigger>
    </canvas.triggers>
    <border
  x:name = "p0"
  background = "{staticresource particlebackgroundcolor}"
  opacity = "{staticresource particleopacity}">
     <border.rendertransform>
     <rotatetransform/>
     </border.rendertransform>
     <border.rendertransformorigin>
     <point x = "{staticresource rotationpointx}" y = "{staticresource rotationpointy}"/>
     </border.rendertransformorigin>
     <ellipse style = "{staticresource ellipsestyle}">
     <ellipse.rendertransform>
      <transformgroup>
      <translatetransform x = "{staticresource startingpointx}" y = "{staticresource startingpointy}"/>
      <rotatetransform angle = "{staticresource particleoriginanglep0}"/>
      </transformgroup>
     </ellipse.rendertransform>
     </ellipse>
    </border>
    <border
  x:name = "p1"
  background = "{staticresource particlebackgroundcolor}"
  opacity = "{staticresource particleopacity}">
     <border.rendertransform>
     <rotatetransform/>
     </border.rendertransform>
     <border.rendertransformorigin>
     <point x = "{staticresource rotationpointx}" y = "{staticresource rotationpointy}"/>
     </border.rendertransformorigin>
     <ellipse style = "{staticresource ellipsestyle}">
     <ellipse.rendertransform>
      <transformgroup>
      <translatetransform x = "{staticresource startingpointx}" y = "{staticresource startingpointy}"/>
      <rotatetransform angle = "{staticresource particleoriginanglep1}"/>
      </transformgroup>
     </ellipse.rendertransform>
     </ellipse>
    </border>
    <border
  x:name = "p2"
  background = "{staticresource particlebackgroundcolor}"
  opacity = "{staticresource particleopacity}">
     <border.rendertransform>
     <rotatetransform/>
     </border.rendertransform>
     <border.rendertransformorigin>
     <point x = "{staticresource rotationpointx}" y = "{staticresource rotationpointy}"/>
     </border.rendertransformorigin>
     <ellipse style = "{staticresource ellipsestyle}">
     <ellipse.rendertransform>
      <transformgroup>
      <translatetransform x = "{staticresource startingpointx}" y = "{staticresource startingpointy}"/>
      <rotatetransform angle = "{staticresource particleoriginanglep2}"/>
      </transformgroup>
     </ellipse.rendertransform>
     </ellipse>
    </border>
    <border
  x:name = "p3"
  background = "{staticresource particlebackgroundcolor}"
  opacity = "{staticresource particleopacity}">
     <border.rendertransform>
     <rotatetransform/>
     </border.rendertransform>
     <border.rendertransformorigin>
     <point x = "{staticresource rotationpointx}" y = "{staticresource rotationpointy}"/>
     </border.rendertransformorigin>
     <ellipse style = "{staticresource ellipsestyle}">
     <ellipse.rendertransform>
      <transformgroup>
      <translatetransform x = "{staticresource startingpointx}" y = "{staticresource startingpointy}"/>
      <rotatetransform angle = "{staticresource particleoriginanglep3}"/>
      </transformgroup>
     </ellipse.rendertransform>
     </ellipse>
    </border>
    <border
  x:name = "p4"
  background = "{staticresource particlebackgroundcolor}"
  opacity = "{staticresource particleopacity}">
     <border.rendertransform>
     <rotatetransform/>
     </border.rendertransform>
     <border.rendertransformorigin>
     <point x = "{staticresource rotationpointx}" y = "{staticresource rotationpointy}"/>
     </border.rendertransformorigin>
     <ellipse style = "{staticresource ellipsestyle}">
     <ellipse.rendertransform>
      <transformgroup>
      <translatetransform x = "{staticresource startingpointx}" y = "{staticresource startingpointy}"/>
      <rotatetransform angle = "{staticresource particleoriginanglep4}"/>
      </transformgroup>
     </ellipse.rendertransform>
     </ellipse>
    </border>
    </canvas>
   </grid>



   </border>
  </controltemplate>
  </setter.value>
 </setter>
 </style>
 
 
 
</resourcedictionary>

在构建中发现，一开始在设定绑定时，写成<solidcolorbrush x:key = "particlecolor" color = "{binding path=fillcolor}" />一直都无法绑定成功，后来查了资料，改成<solidcolorbrush x:key = "particlecolor" color = "{binding path=fillcolor,relativesource={relativesource templatedparent}}" /> 后成功。

4、编辑loading.cs文件，对自定义属性fillcolor和逻辑进行编码：

using system;
using system.collections.generic;
using system.linq;
using system.text;
using system.threading.tasks;
using system.windows;
using system.windows.controls;
using system.windows.data;
using system.windows.documents;
using system.windows.input;
using system.windows.media;
using system.windows.media.imaging;
using system.windows.navigation;
using system.windows.shapes;

namespace wpfcontrollibrarydemo
{
 using system.componentmodel;
 /// <summary>
 /// 按照步骤 1a 或 1b 操作，然后执行步骤 2 以在 xaml 文件中使用此自定义控件。
 ///
 /// 步骤 1a) 在当前项目中存在的 xaml 文件中使用该自定义控件。
 /// 将此 xmlnamespace 特性添加到要使用该特性的标记文件的根 
 /// 元素中:
 ///
 /// xmlns:mynamespace="clr-namespace:wpfcontrollibrarydemo"
 ///
 ///
 /// 步骤 1b) 在其他项目中存在的 xaml 文件中使用该自定义控件。
 /// 将此 xmlnamespace 特性添加到要使用该特性的标记文件的根 
 /// 元素中:
 ///
 /// xmlns:mynamespace="clr-namespace:wpfcontrollibrarydemo;assembly=wpfcontrollibrarydemo"
 ///
 /// 您还需要添加一个从 xaml 文件所在的项目到此项目的项目引用，
 /// 并重新生成以避免编译错误:
 ///
 /// 在解决方案资源管理器中右击目标项目，然后依次单击
 /// “添加引用”->“项目”->[浏览查找并选择此项目]
 ///
 ///
 /// 步骤 2)
 /// 继续操作并在 xaml 文件中使用控件。
 ///
 /// <mynamespace:loading/>
 ///
 /// </summary>
 public class loading : control
 {
 static loading()
 {
  //重载默认样式
  defaultstylekeyproperty.overridemetadata(typeof(loading), new frameworkpropertymetadata(typeof(loading)));
  //dependencyproperty 注册 fillcolor
  fillcolorproperty = dependencyproperty.register("fillcolor",
  typeof(color),
  typeof(loading),
  new uipropertymetadata(colors.darkblue,
  new propertychangedcallback(onurichanged))
  );
  //colors.darkblue为控件初始化默认值

 }
 //属性变更回调函数
 private static void onurichanged(dependencyobject d, dependencypropertychangedeventargs e)
 {
  //border b = (border)d;
  //messagebox.show(e.newvalue.tostring());

 }
 #region 自定义fields
 // dependencyproperty属性定义 fillcolorproperty=fillcolor+property组成
 public static readonly dependencyproperty fillcolorproperty;
 #endregion
 //vs设计器属性支持
 [description("背景色"), category("个性配置"), defaultvalue("#ff668899")]
 public color fillcolor
 {
  //getvalue,setvalue为固定写法，此处一般不建议处理其他逻辑
  get { return (color)getvalue(fillcolorproperty); }
  set { setvalue(fillcolorproperty, value); }
 }
 }
}

 5、编译，如果无误后，可以添加wpf应用程序wpfapploadingtest进行测试（添加项目引用）。

打开mainwindow.xaml，将loading控件拖放到设计界面上，如下图所示：

 6、控件颜色修改，选中控件，在属性栏中进行配置即可：

 7.总结

可以看到wpf自定义控件还是比较容易的，但是难点在于ui的设计，如果需要做的美观，需要美工的参与，而且需要转换成xaml。

以上就是wpf实现炫酷loading控件的全部内容，希望对大家的学习有所帮助。