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
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)
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//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;
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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
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//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);
}
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5、给每个Grid增加一个动画效果,就是向左移动的效果
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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)" ));
}
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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)
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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);
}
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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
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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 ;
}
}
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所有代码如下:
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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();
}
}
}
}
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<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>
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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。
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:http://www.cnblogs.com/ZXdeveloper/archive/2017/05/31/6925228.html