WPF实现上下滚动字幕效果

<local:workspacecontent x:class="suncreate.combatplatform.client.noticemarquee"
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
  xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
  xmlns:local="clr-namespace:suncreate.combatplatform.client;assembly=suncreate.combatplatform.client"
  mc:ignorable="d" 
  d:designheight="35" d:designwidth="300" loaded="workspacecontent_loaded" mouseenter="workspacecontent_mouseenter" mouseleave="workspacecontent_mouseleave">
 <local:workspacecontent.resources>
 <controltemplate x:key="btntemplate" targettype="button">
  <textblock name="txt" margin="5 0 5 0" text="{templatebinding content}" fontsize="12" cursor="hand" tooltip="{templatebinding tooltip}" foreground="#fff" verticalalignment="center"></textblock>
  <controltemplate.triggers>
  <trigger property="ismouseover" value="true">
   <setter targetname="txt" property="foreground" value="#ff5e5e"></setter>
  </trigger>
  </controltemplate.triggers>
 </controltemplate>
 <storyboard x:key="storyboard">
  <doubleanimation duration="0:0:1" to="25" storyboard.targetname="stackpanel" storyboard.targetproperty="rendertransform.y"/>
 </storyboard>
 </local:workspacecontent.resources>
 <grid background="#00a6da">
 <grid.columndefinitions>
  <columndefinition width="60"></columndefinition>
  <columndefinition></columndefinition>
 </grid.columndefinitions>
 <textblock margin="15 0 5 0" text="公告：" fontsize="12" foreground="#ffff33" verticalalignment="center"></textblock>
 <scrollviewer grid.column="1" name="scrollviewer" horizontalscrollbarvisibility="hidden"
   horizontalcontentalignment="stretch"
   verticalscrollbarvisibility="hidden"
   verticalcontentalignment="stretch" height="25">
  <border height="25" >
  <stackpanel x:name="stackpanel" margin="0 -25 0 0" >
   <stackpanel.rendertransform>
   <translatetransform />
   </stackpanel.rendertransform>
   <button name="btn1" height="25" click="btn_click" template="{staticresource btntemplate}"></button>
   <button name="btn2" height="25" click="btn_click" template="{staticresource btntemplate}"></button>
   <button name="btn3" height="25" click="btn_click" template="{staticresource btntemplate}"></button>
  </stackpanel>
  </border>
 </scrollviewer>
 </grid>
</local:workspacecontent>

using suncreate.combatplatform.domain;
using system;
using system.collections.generic;
using system.linq;
using system.text;
using system.threading;
using system.timers;
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.animation;
using system.windows.media.imaging;
using system.windows.navigation;
using system.windows.shapes;

namespace suncreate.combatplatform.client
{
 /// <summary>
 /// 公告滚动显示
 /// </summary>
 public partial class noticemarquee : workspacecontent
 {
 private system.timers.timer _timer;
 private list<tes_notice> _data;
 private int _index;
 private storyboard _storyboard;

 public noticemarquee()
 {
  initializecomponent();
 }

 private void workspacecontent_loaded(object sender, routedeventargs e)
 {
  if (_timer == null)
  {
  _storyboard = (storyboard)this.findresource("storyboard");

  system.threading.tasks.task.factory.startnew(() =>
  {
   while (true)
   {
   int total = 0;
   _data = hi.get<inoticeservice>().getlistpage(null, datetime.minvalue, datetime.now, 1, 3, ref total).tolist();
   _data.reverse();
   _index = _data.count - 1;
   dispatcher.begininvoke(new action(() =>
   {
    stackpanel.rendertransform = new translatetransform(0, 25);
   }));
   showdata();
   thread.sleep(60 * 1000);
   }
  });

  _timer = new system.timers.timer();
  _timer.interval = 5000;
  _timer.elapsed += action;
  _timer.start();
  }
 }

 private void action(object sender, elapsedeventargs e)
 {
  dispatcher.begininvoke(new action(() =>
  {
  stackpanel.rendertransform = new translatetransform(0, 0);
  _storyboard.begin();
  }));

  _index--;
  if (_index < 0)
  {
  _index = _data.count - 1;
  }

  showdata();
 }

 private void showdata()
 {
  dispatcher.begininvoke(new action(() =>
  {
  tes_notice data1 = getdata(_index, 0);
  tes_notice data2 = getdata(_index, 1);
  tes_notice data3 = getdata(_index, 2);

  if (data1 != null)
  {
   btn1.content = data1.notice_content.trim().replace("\r\n", string.empty);
   btn1.commandparameter = data1.id;
   btn1.tooltip = data1.notice_content;
  }

  if (data2 != null)
  {
   btn2.content = data2.notice_content.trim().replace("\r\n", string.empty);
   btn2.commandparameter = data2.id;
   btn2.tooltip = data2.notice_content;
  }

  if (data3 != null)
  {
   btn3.content = data3.notice_content.trim().replace("\r\n", string.empty);
   btn3.commandparameter = data3.id;
   btn3.tooltip = data3.notice_content;
  }
  }));
 }

 private tes_notice getdata(int index, int n)
 {
  if (_data != null)
  {
  int i = index + n;
  if (i > _data.count - 1)
  {
   i = i % _data.count;
  }
  return _data[i];
  }
  return null;
 }

 private void workspacecontent_mouseenter(object sender, mouseeventargs e)
 {
  _timer.stop();
 }

 private void workspacecontent_mouseleave(object sender, mouseeventargs e)
 {
  _timer.start();
 }

 private void btn_click(object sender, routedeventargs e)
 {
  button btn = e.source as button;
  string dataid = btn.commandparameter.tostring();
  noticeview noticeview = new noticeview(dataid);
  noticeview.windowstartuplocation = windowstartuplocation.centerscreen;
  noticeview.showdialog();
 }
 }
}