Example of implementing beautiful marquee special effects in WPF

This article mainly introduces WPF to implement simple marquee effect in detail, which has certain reference value. Interested friends can refer to

Recent projects that use marquee effects The effect is different from that on the Internet. Most of the Internet is continuous, but what we require is discontinuous.

That is, 4 items are displayed on the interface (the number of displayed items is variable). If there are 7 items to be displayed, you will continue to jump left in the 4 spaces. Of course, the connection effect is not very good. nice.

Then, you need to support clicking to remove content that is no longer displayed.

The effect is as follows:

The idea is roughly as follows:

1. Use a ViewBox in the outermost layer to fill in the place, this can facilitate automatic stretching

Copy code The code is as follows:

<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. Define three variables, one is the Count value, which is used to set the display The number of UserControls, for example, the default is 4, as shown in the rendering. Of course, if it is set to 5, it will be 5; a List is for placing a list of display controls, and a List is used To put all the controls that will be used in the ticker.

3. Set up a Canvas and put it into the outermost Viewbox for use during marquees (this is also a commonly used marquee control 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. Put the Grid to be looped into the Canvas. The number of Grids here is one greater than the number displayed, which is Count+1 values, because when scrolling, there is actually one on the outermost side, so this ensures A circular movement. As for the Margin between the two controls, it is necessary to set the Grid. At that time, the control will be directly thrown into the Grid

//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. Add one to each Grid The animation effect is the effect of moving to the left

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. When scrolling, it is necessary to calculate which Grid the UserControl is added to, that is, which control is the first Bit.

We set an index value scroll_index. By default, scroll_index=0, which is the initial state. When scrolling, scroll_index = scroll_index + 1 - Uc_Count;

Then, judge, When looping, is it the end of the display list? If so, the control to be filled is scroll_index %UcListSum.Count (scrolling index, the remainder is taken directly from the total), if not, it is scroll_index++ % UcListSum.Count (scrolling Index++, take the remainder directly from the total number)

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);
}

In the code, it is important to note that (uc.Parent as Grid).Children.Clear(), if not moved If it is removed, it will prompt that it already belongs to another one, so it needs to be removed from the parent.

7. Button’s hidden event. When the Button is clicked, it must be hidden. In fact, it means subtracting the item that is no longer displayed from the total number

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;
 }
}

All codes are as follows:

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>

Unresolved issues

I want to add a button to display when the mouse is hovering, and hide when it is removed, but I found that it is not easy to use. The reason is that when MouseOver goes up, although the value of Visibility changes, it only reaches The next time, the value of Button is attached, but at this time, it is already MouseLeave. Can anyone please guide me on how to show and hide this.

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