基于<MediaElement>的WPF视频播放器（可拖拽进度条播放）
时间：2016-06-29 22:17:29
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一、前言
前两天上峰要求做一个软件使用向导，使用WPF制作。这不，这两天从一张白纸开始学起，做一个播放演示视频的使用向导。以下是粗设计的原型代码：
二、效果图
三、代码
前台代码：
1 <Window 2 xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 3 xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 4 xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 5 xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 6 xmlns:local="clr-namespace:WPF_Nav" 7 xmlns:dxlc="http://schemas.devexpress.com/winfx/2008/xaml/layoutcontrol" xmlns:dxwui="http://schemas.devexpress.com/winfx/2008/xaml/windowsui" x:Class="WPF_Nav.MainWindow" 8 mc:Ignorable="d" 9 Title="MainWindow" Height="480" Width="900" WindowStyle="None"> 10 <Grid Name="Main_Grid"> 11 <Grid.RowDefinitions> 12 <RowDefinition Height="40"></RowDefinition> 13 <RowDefinition Height="343"></RowDefinition> 14 <RowDefinition Height="30"></RowDefinition> 15 <RowDefinition Height="50"></RowDefinition> 16 </Grid.RowDefinitions> 17 <Grid Name="Title" Grid.Row="0"> 18 <Grid.ColumnDefinitions> 19 <ColumnDefinition Width="200"></ColumnDefinition> 20 <ColumnDefinition Width="500"></ColumnDefinition> 21 <ColumnDefinition Width="120"></ColumnDefinition> 22 <ColumnDefinition Width="80"></ColumnDefinition> 23 </Grid.ColumnDefinitions> 24 <Button Grid.Column="3" HorizontalAlignment="Center" Width="40" Height="40" Click="Button_Click" Margin="16,0,0,0" >关闭</Button> 25 </Grid> 26 <Grid Name="Movie" Grid.Row="1"> 27 <MediaElement Stretch="Fill" LoadedBehavior="Manual" Name="QS_Movie" MediaOpened="Element_MediaOpened" Loaded="QS_Movie_Loaded" VerticalAlignment="Stretch" HorizontalAlignment="Stretch"></MediaElement> 28 <Button Name="LeftButton" Width="50" Height="50" HorizontalAlignment="Left" VerticalAlignment="Center" Click="Left_Click">上一个</Button> 29 <Button Name="RightButton" Width="50" Height="50" HorizontalAlignment="Right" VerticalAlignment="Center" Click="Right_Click">下一个</Button> 30 </Grid> 31 <Grid Name="Control_Progress" Grid.Row="2"> 32 <Slider Height="30" Width="700" Name="timelineSlider" VerticalAlignment="Center" PreviewMouseLeftButtonDown="timelineMDown" PreviewMouseLeftButtonUp="timelineMUp" BorderThickness="0,5,0,0" ></Slider> 33 </Grid> 34 <Grid Name="Movie_Control" Grid.Row="3" Margin="0,0,0,0"> 35 <Grid.ColumnDefinitions> 36 <ColumnDefinition Width="200"></ColumnDefinition> 37 <ColumnDefinition Width="500"></ColumnDefinition> 38 <ColumnDefinition Width="50"></ColumnDefinition> 39 <ColumnDefinition Width="150"></ColumnDefinition> 40 </Grid.ColumnDefinitions> 41 <StackPanel Grid.Column="1" Orientation="Horizontal" HorizontalAlignment="Center"> 42 <Button Height="40" Width="40" x:Name="Play" Click="Play_Click" Margin="20,0">播放</Button> 43 <Button Height="40" Width="40" x:Name="Pause" Click="Pause_Click" Margin="20,0">暂停</Button> 44 </StackPanel> 45 <Slider Height="25" Width="120" Name="Volunme" Minimum="0" Maximum="1" Value="{Binding ElementName=QS_Movie,Path=Volume,Mode=TwoWay}" Grid.Column="3" HorizontalAlignment="Left" Margin="0,5,0,0" ></Slider> 46 <Button Height="25" Width="40" Name="Horn" Grid.Column="2" HorizontalAlignment="Right" Margin="0,13">音量</Button> 47 </Grid> 48 </Grid> 49 </Window>
后台代码：
1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5 using System.Threading.Tasks; 6 using System.Windows; 7 using System.Windows.Controls; 8 using System.Windows.Data; 9 using System.Windows.Documents; 10 using System.Windows.Input; 11 using System.Windows.Media; 12 using System.Windows.Media.Imaging; 13 using System.Windows.Navigation; 14 using System.Windows.Shapes; 15 using System.Windows.Threading; 16 17 namespace WPF_Nav 18 { 19 /// <summary> 20 /// MainWindow.xaml 的交互逻辑 21 /// </summary> 22 public partial class MainWindow : Window 23 { 24 DispatcherTimer dispatcherTimer = new System.Windows.Threading.DispatcherTimer(); // 定义一个DT 25 public MainWindow() 26 { 27 InitializeComponent(); 28 } 29 30 private void Play_Click(object sender, RoutedEventArgs e) 31 { 32 QS_Movie.Play(); 33 } 34 35 private void Pause_Click(object sender, RoutedEventArgs e) 36 { 37 QS_Movie.Pause(); 38 } 39 40 private void Element_MediaOpened(object sender, EventArgs e) 41 { 42 timelineSlider.Maximum = QS_Movie.NaturalDuration.TimeSpan.TotalMilliseconds; //设置slider最大值 43 int sec = (int)QS_Movie.NaturalDuration.TimeSpan.TotalSeconds; 44 dispatcherTimer.Tick += new EventHandler(dispatcherTimer_Tick); //超过计时间隔时发生 45 dispatcherTimer.Interval = new TimeSpan(0, 0, 0, 0, 500); //DT间隔 46 dispatcherTimer.Start(); //DT启动 47 } 48 49 private void dispatcherTimer_Tick(object sender, EventArgs e) 50 { 51 timelineSlider.Value = QS_Movie.Position.TotalMilliseconds; //slider滑动值随播放内容位置变化 52 } 53 54 private void timelineMDown(object sender, EventArgs e) 55 { 56 dispatcherTimer.Stop(); 57 } 58 private void timelineMUp(object sender, EventArgs e) 59 { 60 QS_Movie.Position = new TimeSpan(0, 0, 0, 0, (int)timelineSlider.Value); 61 dispatcherTimer.Start(); 62 QS_Movie.Play(); 63 } 64 65 private void QS_Movie_Loaded(object sender, RoutedEventArgs e) 66 { 67 QS_Movie.Source = new Uri(@"E:\Test\WPFTest\Sources\preview.mp4"); 68 QS_Movie.Play(); 69 System.Threading.Thread.Sleep(500); 70 QS_Movie.Pause(); 71 } 72 73 private void Left_Click(object sender, RoutedEventArgs e) 74 { 75 QS_Movie.Source = new Uri(@"E:\Test\WPFTest\Sources\preview1.mp4"); 76 QS_Movie.Play(); 77 System.Threading.Thread.Sleep(500); 78 QS_Movie.Pause(); 79 } 80 81 private void Right_Click(object sender, RoutedEventArgs e) 82 { 83 QS_Movie.Source = new Uri(@"E:\Test\WPFTest\Sources\preview2.mp4"); 84 QS_Movie.Play(); 85 System.Threading.Thread.Sleep(500); 86 QS_Movie.Pause(); 87 } 88 89 private void Button_Click(object sender, RoutedEventArgs e) 90 { 91 this.Close(); 92 } 93 94 95 96 } 97 98 99 }
四、小结
刚玩WPF两天，可能有些地方写的不好望见谅，听江湖传言<MediaElement>可能对Win8不支持，我也不清楚，我是Win7的。所以以上代码仅供参考。
PS：使用向导该怎么做？因为公司软件里的按钮都能按F1直接切到官方文档，还有Tooltips自带小视频演示，我这使用向导思来想去还是用视频的方式呈现，但是组长说做的像个播放器，不像使用向导，我是想把软件每步操作都做成视频左右翻页的，确是是像播放器。这可怎么整？求万能的博友指明一条活路！
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