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<RepeatButton x:Name="HorizontalTrackLargeChangeDecreaseRepeatButton" GridColumn="0" Template="{StaticResource ctRepeatButton}" IsTabStop="False" /> <Thumb x:Name="HorizontalThumb" Height="14" Width="11" GridColumn="1"/> <RepeatButton x:Name="HorizontalTrackLargeChangeIncreaseRepeatButton" GridColumn="2" Template="{StaticResource ctRepeatButton}" IsTabStop="False" /> </Grid> <Grid GridRow="2" VerticalAlignment="Bottom" HorizontalAlignment="Stretch"> <StackPanel x:Name="TotalDuration" Orientation="Horizontal"> <TextBlock x:Name="textPosition" FontSize="12"/> <TextBlock Text=" / " FontSize="12" Margin="3,0,3,0"/> <TextBlock x:Name="textDuration" FontSize="12" /> </StackPanel> </Grid> </Grid> </Grid> </ControlTemplate> <Style TargetType="local:MediaSlider"> <Setter Property="Template" Value="{StaticResource ctMediaSliderDefault}" /> </Style> If you look at the default control template of the Slider control (one way to do so is to create a copy of the control template in Expression Blend, as we did for the sample in 5), it is obvious from Listing 10-6 that you use that template as a starting point and make some modifications in creating a control template named ctMediaSliderDefault The default Slider control template contains two visual representations: one for when the SliderOrientation property is set to OrientationHorizontal and another for when it is set to Orientation.

The large photo is defined in catalog.zul as follows:

Vertical These parts are defined within two Grids named HorizontalTemplate and VerticalTemplate Because you always use the MediaSlider in horizontal orientation, in ctMediaSliderDefault you leave out the VerticalTemplate portion You can always add it back if you intend to use this control oriented vertically as well The definition of HorizontalTemplate gives you a good idea of what the vertical counterpart should contain Within HorizontalTemplate is a Thumb control named Thumb As we discuss later, you use the Thumb to report progress by moving it along the slider as media plays The user can also drag the Thumb along the slider in either direction to seek within the media Additionally, the two RepeatButton instances, named HorizontalTrackLargeChangeDecreaseRepeatButton and HorizontalTrackLargeChangeIncreaseRepeatButton, form the clickable areas on the slider on the two sides of the Thumb Clicking causes the Thumb to progress on either side.

6

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Because these are RepeatButtons, holding the mouse left button down causes repeated click events to be raised at an interval defined by the RepeatButtonInterval property; this property is set to the number of milliseconds by which you want the click events to be separated You also add two Border controls, named elemDownloadProgressIndicator and elemPlayProgressIndicator, that progress along the MediaSlider background; the former reports.

media download progress, and the latter reports play progress and trails the Thumb as it moves along the MediaSlider. Finally, you add a StackPanel named TotalDuration with two TextBlocks in it. The TextBlock named textDuration is set to the total duration of the media after it starts playing, and the one named textPosition reports the media s current position as it plays. To use the control template, you create a style with the target type set to the control s type and the Template property set to the control template. The style is shown at the end of Listing 10-6. In the control s code, you can see how the style is used. To learn more about control templating and custom controls, refer to 5. Listing 10-7 shows the code for the control. Listing 10-7. MediaSlider Control Code using using using using using using System; System.Windows; System.Windows.Controls; System.Windows.Controls.Primitives; System.Windows.Media; System.Windows.Threading;

namespace Recipe10_2 { public class MediaSlider : Slider { private MediaElement MediaSource; private FrameworkElement elemDownloadProgressIndicator; private FrameworkElement elemPlayProgressIndicator; private FrameworkElement Root; private TextBlock textPosition; private TextBlock textDuration; private TextBlock textDownloadPercent; private Thumb HorizontalThumb; private DispatcherTimer disptimerPlayProgressUpdate; //SourceName dependency property - used to attach //a Media element to this control public static DependencyProperty SourceNameProperty = DependencyProperty.Register("SourceName", typeof(string), typeof(MediaSlider), new PropertyMetadata(new PropertyChangedCallback(OnSourceNameChanged))); public string SourceName { get { return (string)GetValue(SourceNameProperty); } set

{ SetValue(SourceNameProperty, value); } } //SourceName change handler private static void OnSourceNameChanged(DependencyObject Source, DependencyPropertyChangedEventArgs e) { MediaSlider thisSlider = Source as MediaSlider; if (e.NewValue != null && e.NewValue != e.OldValue && thisSlider.Root != null) { thisSlider.MediaSource = thisSlider.Root.FindName(e.NewValue as string) as MediaElement; //reinitialize thisSlider.InitMediaElementConnections(); } }

<div height="375px" style="overflow:hidden"> <image id="bigimage" width="500px" height="375px" src="${item.imageURL}"/> </div>

public MediaSlider() : base() { this.DefaultStyleKey = typeof(MediaSlider); this.Maximum = 100; this.Minimum = 0; disptimerPlayProgressUpdate = new DispatcherTimer(); disptimerPlayProgressUpdate.Interval = new TimeSpan(0, 0, 0, 0, 50); disptimerPlayProgressUpdate.Tick += new EventHandler(PlayProgressUpdate_Tick); } public override void OnApplyTemplate() { base.OnApplyTemplate(); elemDownloadProgressIndicator = GetTemplateChild("elemDownloadProgressIndicator") as FrameworkElement; elemPlayProgressIndicator = GetTemplateChild("elemPlayProgressIndicator") as FrameworkElement; HorizontalThumb = GetTemplateChild("HorizontalThumb") as Thumb; if (HorizontalThumb != null) { HorizontalThumb.DragStarted += new DragStartedEventHandler(HorizontalThumb_DragStarted); HorizontalThumb.DragCompleted +=

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