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WPF 简易的跑马灯效果
最近项目上要用到跑马灯的效果，和网上不太相同的是，网上大部分都是连续的，而我们要求的是不连续的。
也就是是，界面上就展示4项（展示项数可变），如果有7项要展示的话，则不断的在4个空格里左跳，当然，衔接上效果不是很好看。
然后，需要支持点击以后进行移除掉不再显示的内容。
效果如下：
思路大致如下：
1、最外层用一个ViewBox，为了可以填充调用此控件的地方，这样可以方便自动拉伸
<Viewbox x:Name="viewbox_main" Height="{Binding Path=ActualHeight}" Width="{Binding Path=ActualWidth}" MouseLeave="grid_main_MouseLeave" MouseMove="grid_main_MouseMove" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Stretch="Fill"/>
2、定义三个变量，一个是Count值，是为了设定要展示的UserControl的个数的，例如默认是4个，如效果图，当然，设置成5的话，就是5个了；一个List<Grid>是为了放入展示控件的列表，一个List<UserControl>是用来放所有要用于跑马灯里的控件的。
3、设置一个Canvas，放入到最外层的Viewbox中，用于跑马灯时候用（这也是常用的跑马灯控件Canvas）
//给Canvas设置一些属性 canvas_board.VerticalAlignment = VerticalAlignment.Stretch; canvas_board.HorizontalAlignment = HorizontalAlignment.Stretch;canvas_board.Width = this.viewbox_main.ActualWidth;canvas_board.Height = this.viewbox_main.ActualHeight;canvas_board.ClipToBounds = true;//用viewbox可以支持拉伸this.viewbox_main.Child = canvas_board;
4、将要循环的Grid放入到Canvas里，这里的Grid的个数，要比展示的个数大一个，也就是Count+1个值，因为滚动的时候，其实是在最外面有一个的，这样保证了循环的走动。至于两个控件之间的Margin这个就是要设置Grid的了，到时候控件是直接扔进Grid里的
//循环将Grid加入到要展示的列表里for (int i = 0; i < Uc_Count + 1; i++){ Grid grid = new Grid(); grid.Width = canvas_board.Width / Uc_Count - 10; grid.Height = canvas_board.Height - 10; grid.Margin = new Thickness(5); this.canvas_board.Children.Add(grid); grid.SetValue(Canvas.TopProperty, 0.0); grid.SetValue(Canvas.LeftProperty, i * (grid.Width + 10)); UcListForShow.Add(grid);}
5、给每个Grid增加一个动画效果，就是向左移动的效果
for (int i = 0; i < UcListForShow.Count; i++){ //设置滚动时候的效果 DoubleAnimationUsingKeyFrames daukf_uc = new DoubleAnimationUsingKeyFrames(); LinearDoubleKeyFrame k1_uc = new LinearDoubleKeyFrame(i * (UcListForShow[i].Width + 10), KeyTime.FromTimeSpan(TimeSpan.FromSeconds(2))); LinearDoubleKeyFrame k2_uc = new LinearDoubleKeyFrame((i - 1) * (UcListForShow[i].Width + 10), KeyTime.FromTimeSpan(TimeSpan.FromSeconds(2.5))); daukf_uc.KeyFrames.Add(k1_uc); daukf_uc.KeyFrames.Add(k2_uc); storyboard_imgs.Children.Add(daukf_uc); Storyboard.SetTarget(daukf_uc, UcListForShow[i]); Storyboard.SetTargetProperty(daukf_uc, new PropertyPath("(Canvas.Left)"));}
6、滚动的时候，要计算UserControl到底是添加到了哪个Grid里面，也就是哪个控件作为了第一位。
我们设置一个索引值scroll_index，默认的时候，scroll_index=0，这是初始的状态，当滚动起来以后，scroll_index = scroll_index + 1 - Uc_Count;
然后，判断，循环的时候，是否是展示列表的末尾了，如果是的话，则要填充的控件是scroll_index %UcListSum.Count（滚动索引，对总数直接取余数），如果不是的话则是scroll_index++ % UcListSum.Count（滚动索引++，对总数直接取余数）
scroll_index = scroll_index + 1 - Uc_Count;for (int i = 0; i < UcListForShow.Count; i++){ UcListForShow[i].SetValue(Canvas.LeftProperty, i * (UcListForShow[i].Width + 10)); UserControl uc; if (i == UcListForShow.Count - 1) { uc = UcListSum[scroll_index % UcListSum.Count]; } else { uc = UcListSum[scroll_index++ % UcListSum.Count]; } if (uc.Parent != null) { (uc.Parent as Grid).Children.Clear();//将Usercontrol从原来的里面移除掉，要不然会抛错，Usercontrol已属于另一个控件 } UcListForShow[i].Children.Clear(); UcListForShow[i].Children.Add(uc); //将隐藏按钮加入到Grid里 Button btn = new Button(); btn.Style = (dictionary["hidenStyle"] as Style);//从样式文件里读取到Button的样式 btn.Tag = UcListForShow[i].Children;//给Tag赋值，这样方便查找 btn.Click += Btn_Click;//注册隐藏事件 UcListForShow[i].Children.Add(btn);}
代码中，需要注意的是(uc.Parent as Grid).Children.Clear()，如果不移除的话，则会提示，已经属于另一个，所以，要从parent里面移除掉。
7、Button的隐藏事件，当Button点击以后，则要进行隐藏，其实也就是将总数里面，减除掉不再显示的那一项
private void Btn_Click(object sender, RoutedEventArgs e){ if ((sender as Button).Tag != null) { UcListSum.Remove((((sender as Button).Tag as UIElementCollection)[0] as UserControl)); } if (UcListSum.Count == Uc_Count)//当列表数和要展示的数目相同的时候，就停止掉动画效果 { storyboard_imgs.Completed -= Storyboard_imgs_Completed; storyboard_imgs.Stop(); for (int i = 0; i < Uc_Count; i++) { UcListForShow[i].Children.Clear(); if (UcListSum[i].Parent != null) { (UcListSum[i].Parent as Grid).Children.Clear(); } UcListForShow[i].Children.Add(UcListSum[i]); } return; }}
所有代码如下：
using System;using System.Collections.Generic;using System.Linq;using System.Text;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 MarqueeUserControl{ /// <summary> /// MarqueeUC.xaml 的交互逻辑 /// </summary> public partial class MarqueeUC : UserControl { ResourceDictionary dictionary; public MarqueeUC() { InitializeComponent(); //读取样式文件 dictionary = new ResourceDictionary { Source = new Uri("/MarqueeUserControl;component/MarqueeUserControlDictionary.xaml", UriKind.Relative) }; } #region 属性 private int _uc_Count = 0; /// <summary> /// 用来展示几个 /// </summary> public int Uc_Count { get { return _uc_Count; } set { _uc_Count = value; } } private List<Grid> _ucListForShow = new List<Grid>(); /// <summary> /// 用来展示的控件列表 /// </summary> private List<Grid> UcListForShow { get { return _ucListForShow; } set { _ucListForShow = value; } } private List<UserControl> _ucListSum = new List<UserControl>(); /// <summary> /// 要添加的控件的列表 /// </summary> public List<UserControl> UcListSum { get { return _ucListSum; } set { _ucListSum = value; } } #endregion Canvas canvas_board = new Canvas(); Storyboard storyboard_imgs = new Storyboard(); int scroll_index = 0;//滚动索引 double scroll_width;//滚动宽度 void GridLayout() { if (Uc_Count == 0)//如果这个值没有赋值的话，则默认显示四个 { Uc_Count = 4; } //给Canvas设置一些属性 canvas_board.VerticalAlignment = VerticalAlignment.Stretch; canvas_board.HorizontalAlignment = HorizontalAlignment.Stretch; canvas_board.Width = this.viewbox_main.ActualWidth; canvas_board.Height = this.viewbox_main.ActualHeight; canvas_board.ClipToBounds = true; //用viewbox可以支持拉伸 this.viewbox_main.Child = canvas_board; //循环将Grid加入到要展示的列表里 for (int i = 0; i < Uc_Count + 1; i++) { Grid grid = new Grid(); grid.Width = canvas_board.Width / Uc_Count - 10; grid.Height = canvas_board.Height - 10; grid.Margin = new Thickness(5); this.canvas_board.Children.Add(grid); grid.SetValue(Canvas.TopProperty, 0.0); grid.SetValue(Canvas.LeftProperty, i * (grid.Width + 10)); UcListForShow.Add(grid); } } void StoryLoad() { for (int i = 0; i < UcListForShow.Count; i++) {//设置滚动时候的效果 DoubleAnimationUsingKeyFrames daukf_uc = new DoubleAnimationUsingKeyFrames(); LinearDoubleKeyFrame k1_uc = new LinearDoubleKeyFrame(i * (UcListForShow[i].Width + 10), KeyTime.FromTimeSpan(TimeSpan.FromSeconds(2))); LinearDoubleKeyFrame k2_uc = new LinearDoubleKeyFrame((i - 1) * (UcListForShow[i].Width + 10), KeyTime.FromTimeSpan(TimeSpan.FromSeconds(2.5))); daukf_uc.KeyFrames.Add(k1_uc); daukf_uc.KeyFrames.Add(k2_uc); storyboard_imgs.Children.Add(daukf_uc); Storyboard.SetTarget(daukf_uc, UcListForShow[i]); Storyboard.SetTargetProperty(daukf_uc, new PropertyPath("(Canvas.Left)")); } storyboard_imgs.FillBehavior = FillBehavior.Stop; storyboard_imgs.Completed += Storyboard_imgs_Completed; storyboard_imgs.Begin(); } private void Storyboard_imgs_Completed(object sender, EventArgs e) { scroll_index = scroll_index + 1 - Uc_Count; for (int i = 0; i < UcListForShow.Count; i++) { UcListForShow[i].SetValue(Canvas.LeftProperty, i * (UcListForShow[i].Width + 10)); UserControl uc; if (i == UcListForShow.Count - 1) { uc = UcListSum[scroll_index % UcListSum.Count]; } else { uc = UcListSum[scroll_index++ % UcListSum.Count]; } if (uc.Parent != null) { (uc.Parent as Grid).Children.Clear();//将Usercontrol从原来的里面移除掉，要不然会抛错，Usercontrol已属于另一个控件 } UcListForShow[i].Children.Clear(); UcListForShow[i].Children.Add(uc); //将隐藏按钮加入到Grid里 Button btn = new Button(); btn.Style = (dictionary["hidenStyle"] as Style);//从样式文件里读取到Button的样式 btn.Tag = UcListForShow[i].Children;//给Tag赋值，这样方便查找 btn.Click += Btn_Click;//注册隐藏事件 UcListForShow[i].Children.Add(btn); } storyboard_imgs.Begin(); } private void Btn_Click(object sender, RoutedEventArgs e) { if ((sender as Button).Tag != null) { UcListSum.Remove((((sender as Button).Tag as UIElementCollection)[0] as UserControl)); } if (UcListSum.Count == Uc_Count)//当列表数和要展示的数目相同的时候，就停止掉动画效果 { storyboard_imgs.Completed -= Storyboard_imgs_Completed; storyboard_imgs.Stop(); for (int i = 0; i < Uc_Count; i++) { UcListForShow[i].Children.Clear(); if (UcListSum[i].Parent != null) { (UcListSum[i].Parent as Grid).Children.Clear(); } UcListForShow[i].Children.Add(UcListSum[i]); } return; } } public void StartMar() { GridLayout(); scroll_width = this.canvas_board.Width; for (int i = 0; i < UcListForShow.Count; i++) { UserControl uc; if (i == UcListForShow.Count - 1) { uc = UcListSum[scroll_index % UcListSum.Count]; } else { uc = UcListSum[scroll_index++ % UcListSum.Count]; } if (uc.Parent != null) { (uc.Parent as Grid).Children.Clear(); } UcListForShow[i].Children.Clear(); UcListForShow[i].Children.Add(uc); } StoryLoad(); } private void grid_main_MouseLeave(object sender, MouseEventArgs e) { if (storyboard_imgs.GetCurrentState() == ClockState.Stopped)//如果是停止的状态，则直接返回，不再起作用 { return; } if (storyboard_imgs.GetIsPaused() == true)//如果是暂停状态的话，则开始 { storyboard_imgs.Begin(); } } private void grid_main_MouseMove(object sender, MouseEventArgs e) { if (storyboard_imgs.GetIsPaused() == false) { storyboard_imgs.Pause(); } } }}
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:MarqueeUserControl"> <Style TargetType="Button" x:Key="hidenStyle"> <Setter Property="Background" Value="Transparent"/> <Setter Property="HorizontalAlignment" Value="Center"/> <Setter Property="VerticalAlignment" Value="Center"/> <Setter Property="Width" Value="25"/> <Setter Property="Height" Value="25"/> <Setter Property="BorderBrush" Value="Transparent"/> <Setter Property="BorderThickness" Value="0"/> <Setter Property="Template"><!--把Image放到Template里作为Content显示，如果是单独给Content设置图片的话，则只有一个按钮显示图片，其他的不显示--> <Setter.Value> <ControlTemplate TargetType="{x:Type Button}"> <Border> <Image Source="hiden.png"/> </Border> </ControlTemplate> </Setter.Value> </Setter> </Style></ResourceDictionary>
没有解决的问题
想给Button增加鼠标悬停的时候，显示，移除的时候隐藏，但是发现不好使，原因是当MouseOver上去的时候，虽然Visibility的值变了，但是只有到下一次的时候，Button的值才被附上，而此时，已经MouseLeave了，请哪位大神指导一下，看看这个显示和隐藏怎么做。
WPF 简易的跑马灯效果
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