小編給大家分享一下WPF實(shí)現(xiàn)跑馬燈特效的方法，希望大家閱讀完這篇文章后大所收獲，下面讓我們一起去探討吧！
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最近項(xiàng)目上要用到跑馬燈的效果，和網(wǎng)上不太相同的是，網(wǎng)上大部分都是連續(xù)的，而我們要求的是不連續(xù)的。
也就是是，界面上就展示4項(xiàng)（展示項(xiàng)數(shù)可變），如果有7項(xiàng)要展示的話，則不斷的在4個(gè)空格里左跳，當(dāng)然，銜接上效果不是很好看。
然后，需要支持點(diǎn)擊以后進(jìn)行移除掉不再顯示的內(nèi)容。
效果如下：
思路大致如下：
1、最外層用一個(gè)ViewBox，為了可以填充調(diào)用此控件的地方，這樣可以方便自動(dòng)拉伸
復(fù)制代碼 代碼如下:
2、定義三個(gè)變量，一個(gè)是Count值，是為了設(shè)定要展示的UserControl的個(gè)數(shù)的，例如默認(rèn)是4個(gè)，如效果圖，當(dāng)然，設(shè)置成5的話，就是5個(gè)了；一個(gè)List
3、設(shè)置一個(gè)Canvas，放入到最外層的Viewbox中，用于跑馬燈時(shí)候用（這也是常用的跑馬燈控件Canvas）
//給Canvas設(shè)置一些屬性 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、將要循環(huán)的Grid放入到Canvas里，這里的Grid的個(gè)數(shù)，要比展示的個(gè)數(shù)大一個(gè)，也就是Count+1個(gè)值，因?yàn)闈L動(dòng)的時(shí)候，其實(shí)是在最外面有一個(gè)的，這樣保證了循環(huán)的走動(dòng)。至于兩個(gè)控件之間的Margin這個(gè)就是要設(shè)置Grid的了，到時(shí)候控件是直接扔進(jìn)Grid里的
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//循環(huán)將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、給每個(gè)Grid增加一個(gè)動(dòng)畫效果，就是向左移動(dòng)的效果
for (int i = 0; i < UcListForShow.Count; i++)
{
//設(shè)置滾動(dòng)時(shí)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、滾動(dòng)的時(shí)候，要計(jì)算UserControl到底是添加到了哪個(gè)Grid里面，也就是哪個(gè)控件作為了第一位。
我們設(shè)置一個(gè)索引值scroll_index，默認(rèn)的時(shí)候，scroll_index=0，這是初始的狀態(tài)，當(dāng)滾動(dòng)起來以后，scroll_index = scroll_index + 1 - Uc_Count;
然后，判斷，循環(huán)的時(shí)候，是否是展示列表的末尾了，如果是的話，則要填充的控件是scroll_index %UcListSum.Count（滾動(dòng)索引，對總數(shù)直接取余數(shù)），如果不是的話則是scroll_index++ % UcListSum.Count（滾動(dòng)索引++，對總數(shù)直接取余數(shù)）
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();//將Usercontrol從原來的里面移除掉，要不然會(huì)拋錯(cuò)，Usercontrol已屬于另一個(gè)控件
}
UcListForShow[i].Children.Clear();
UcListForShow[i].Children.Add(uc);
//將隱藏按鈕加入到Grid里
Button btn = new Button();
btn.Style = (dictionary["hidenStyle"] as Style);//從樣式文件里讀取到Button的樣式
btn.Tag = UcListForShow[i].Children;//給Tag賦值，這樣方便查找
btn.Click += Btn_Click;//注冊隱藏事件
UcListForShow[i].Children.Add(btn);
}代碼中，需要注意的是(uc.Parent as Grid).Children.Clear()，如果不移除的話，則會(huì)提示，已經(jīng)屬于另一個(gè)，所以，要從parent里面移除掉。
7、Button的隱藏事件，當(dāng)Button點(diǎn)擊以后，則要進(jìn)行隱藏，其實(shí)也就是將總數(shù)里面，減除掉不再顯示的那一項(xiàng)
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)//當(dāng)列表數(shù)和要展示的數(shù)目相同的時(shí)候，就停止掉動(dòng)畫效果
{
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;
}
}所有代碼如下：
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
{
///
/// MarqueeUC.xaml 的交互邏輯
///
public partial class MarqueeUC : UserControl
{
ResourceDictionary dictionary;
public MarqueeUC()
{
InitializeComponent();
//讀取樣式文件
dictionary = new ResourceDictionary { Source = new Uri("/MarqueeUserControl;component/MarqueeUserControlDictionary.xaml", UriKind.Relative) };
}
#region 屬性
private int _uc_Count = 0;
///
/// 用來展示幾個(gè)
///
public int Uc_Count
{
get
{
return _uc_Count;
}
set
{
_uc_Count = value;
}
}
private List _ucListForShow = new List();
///
/// 用來展示的控件列表
///
private List UcListForShow
{
get
{
return _ucListForShow;
}
set
{
_ucListForShow = value;
}
}
private List _ucListSum = new List();
///
/// 要添加的控件的列表
///
public List UcListSum
{
get
{
return _ucListSum;
}
set
{
_ucListSum = value;
}
}
#endregion
Canvas canvas_board = new Canvas();
Storyboard storyboard_imgs = new Storyboard();
int scroll_index = 0;//滾動(dòng)索引
double scroll_width;//滾動(dòng)寬度
void GridLayout()
{
if (Uc_Count == 0)//如果這個(gè)值沒有賦值的話，則默認(rèn)顯示四個(gè)
{
Uc_Count = 4;
}
//給Canvas設(shè)置一些屬性
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;
//循環(huán)將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++)
{//設(shè)置滾動(dòng)時(shí)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();//將Usercontrol從原來的里面移除掉，要不然會(huì)拋錯(cuò)，Usercontrol已屬于另一個(gè)控件
}
UcListForShow[i].Children.Clear();
UcListForShow[i].Children.Add(uc);
//將隱藏按鈕加入到Grid里
Button btn = new Button();
btn.Style = (dictionary["hidenStyle"] as Style);//從樣式文件里讀取到Button的樣式
btn.Tag = UcListForShow[i].Children;//給Tag賦值，這樣方便查找
btn.Click += Btn_Click;//注冊隱藏事件
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)//當(dāng)列表數(shù)和要展示的數(shù)目相同的時(shí)候，就停止掉動(dòng)畫效果
{
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)//如果是停止的狀態(tài)，則直接返回，不再起作用
{
return;
}
if (storyboard_imgs.GetIsPaused() == true)//如果是暫停狀態(tài)的話，則開始
{
storyboard_imgs.Begin();
}
}
private void grid_main_MouseMove(object sender, MouseEventArgs e)
{
if (storyboard_imgs.GetIsPaused() == false)
{
storyboard_imgs.Pause();
}
}
}
} 沒有解決的問題
想給Button增加鼠標(biāo)懸停的時(shí)候，顯示，移除的時(shí)候隱藏，但是發(fā)現(xiàn)不好使，原因是當(dāng)MouseOver上去的時(shí)候，雖然Visibility的值變了，但是只有到下一次的時(shí)候，Button的值才被附上，而此時(shí)，已經(jīng)MouseLeave了，請哪位大神指導(dǎo)一下，看看這個(gè)顯示和隱藏怎么做。
看完了這篇文章，相信你對WPF實(shí)現(xiàn)跑馬燈特效的方法有了一定的了解，想了解更多相關(guān)知識(shí)，歡迎關(guān)注創(chuàng)新互聯(lián)行業(yè)資訊頻道，感謝各位的閱讀！
