实例介绍
【实例截图】
【核心代码】
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; 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.Imaging; using System.Windows.Navigation; using System.Windows.Shapes; using System.Windows.Threading; namespace WpfApp1 { /// <summary> /// MainWindow.xaml 的交互逻辑 /// </summary> public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); tmrProgress = new DispatcherTimer(); //设置计时器的时间间隔为1秒 tmrProgress.Interval = new TimeSpan(0, 0, 1); //计时器触发事件处理 tmrProgress.Tick = SetDisplayMessage; SetImageForMediaElement(); } //将录像的第一帧作为播放前MediaElement显示的录像截图 public void SetImageForMediaElement() { videoScreenMediaElement.Play(); videoScreenMediaElement.Pause(); videoScreenMediaElement.Position = TimeSpan.Zero; } //计时器,定时更新进度条和播放时间 private DispatcherTimer tmrProgress = new DispatcherTimer(); //计时器触发事件处理 private void SetDisplayMessage(Object sender, System.EventArgs e) { if (videoScreenMediaElement.NaturalDuration.HasTimeSpan) { TimeSpan currentPositionTimeSpan = videoScreenMediaElement.Position; string currentPosition = string.Format("{0:00}:{1:00}:{2:00}", (int)currentPositionTimeSpan.TotalHours, currentPositionTimeSpan.Minutes, currentPositionTimeSpan.Seconds); TimeSpan totaotp = videoScreenMediaElement.NaturalDuration.TimeSpan; string totalPostion = string.Format("{0:00}:{1:00}:{2:00}", (int)totaotp.TotalHours, totaotp.Minutes, totaotp.Seconds); currentPositionTime.Text = currentPosition; playProgressSlider.Value = videoScreenMediaElement.Position.TotalSeconds; } } //当完成媒体加载时发生 private void videoScreenMediaElement_MediaOpened(object sender, RoutedEventArgs e) { playProgressSlider.Minimum = 0; playProgressSlider.Maximum = videoScreenMediaElement.NaturalDuration.TimeSpan.TotalSeconds; TimeSpan totaotp = videoScreenMediaElement.NaturalDuration.TimeSpan; videoAllTime.Text = "/" string.Format("{0:00}:{1:00}:{2:00}", (int)totaotp.TotalHours, totaotp.Minutes, totaotp.Seconds); currentPositionTime.Text = "00:00:00"; } private void play_Click(object sender, RoutedEventArgs e) { //启动计时器 if (!tmrProgress.IsEnabled) { tmrProgress.Start(); } videoScreenMediaElement.Play(); } //在鼠标拖动Thumb的过程中记录其值。 private TimeSpan ts = new TimeSpan(); private void playProgressSlider_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e) { ts = TimeSpan.FromSeconds(e.NewValue); string currentPosition = string.Format("{0:00}:{1:00}:{2:00}", (int)ts.TotalHours, ts.Minutes, ts.Seconds); currentPositionTime.Text = currentPosition; } //当拖动Thumb的鼠标放开时,从指定时间开始播放 private void playProgressSlider_PreviewMouseUp(object sender, MouseButtonEventArgs e) { videoScreenMediaElement.Position = ts; } private void MainWindow_Closed(object sender, EventArgs e) { if (tmrProgress.IsEnabled) { tmrProgress.Stop(); } } private void videoScreenMediaElement_MediaEnded(object sender, RoutedEventArgs e) { videoScreenMediaElement.Position = TimeSpan.Zero; videoScreenMediaElement.Stop(); } private void pause_Click(object sender, RoutedEventArgs e) { videoScreenMediaElement.Pause(); } private void stop_Click(object sender, RoutedEventArgs e) { videoScreenMediaElement.Stop(); } private void playImage_MouseUp(object sender, MouseButtonEventArgs e) { Image image = sender as Image; Uri uri = new Uri(@"Images/pause.png"); image.Source = new BitmapImage(uri); } private void Image_MouseEnter(object sender, MouseEventArgs e) { Image image = sender as Image; image.Height = 23; } private void Image_MouseLeave(object sender, MouseEventArgs e) { Image image = sender as Image; image.Height = 20; } private void playImage_MouseEnter(object sender, MouseEventArgs e) { Image image = sender as Image; image.Height = 28; } private void playImage_MouseLeave(object sender, MouseEventArgs e) { Image image = sender as Image; image.Height = 25; } } }
标签: 实用WPF代码
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