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Figure 10-28. Application user interface The dropdowns list the video and audio capture devices on your system. The button marked with a camcorder symbol allows you to toggle between capturing video and stopping an ongoing capture using the selected devices. If no devices are selected, the default devices for the system are used. The rightmost button marked with a camera symbol captures a still image from the capture device on each click, which is displayed right beside the video capture display area in a vertical list as shown in Figure 10-28. Lastly, the information button right beside each dropdown displays the supported formats on the device and their properties. The XAML for this application is fairly simple, and we do not list it completely here for brevity. Listing 10-33 shows the code for the Loaded handler of the page. Listing 10-33. Loaded handler for the MainPage //collection to hold all the still images ObservableCollection<WriteableBitmap> obscollSnapsTaken = new ObservableCollection<WriteableBitmap>(); void MainPage_Loaded(object sender, RoutedEventArgs e) { //populate the video device combobox with all available

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//video capture devices cbxVideoDevices.ItemsSource = new ObservableCollection<VideoCaptureDevice>( CaptureDeviceConfiguration.GetAvailableVideoCaptureDevices()); //populate the audio device combobox with all available //video capture devices cbxAudioDevices.ItemsSource = new ObservableCollection<AudioCaptureDevice>( CaptureDeviceConfiguration.GetAvailableAudioCaptureDevices()); //set the itemscontrol for still images to a blank collection itmctrlSnappedPics.ItemsSource = obscollSnapsTaken; } As shown in Listing 10-33, you acquire the available video and audio capture devices using the appropriate static methods on the CaptureDeviceConfiguration type and use the returned collections to set the respective comboboxes in the user interface. Listing 10-34 shows the XAML for the data template that are used to bind the data to the comboboxes. Listing 10-34. Data Template for the capture device comboboxes <DataTemplate x:Key="dtDeviceComboItem"> <Grid> <Grid.ColumnDefinitions> <ColumnDefinition Width="*"/> <ColumnDefinition Width="Auto"/> </Grid.ColumnDefinitions> <TextBlock Text="{Binding FriendlyName}"/> <Image Source="{Binding IsDefaultDevice, Converter={StaticResource REF_DefaultDeviceIndicatorConverter}}" Width="16" Height="16" Margin="3" Grid.Column="1"/> </Grid> </DataTemplate> You display the FriendlyName property on the CaptureDevice class (base class for all capture devices) and also display an image beside the name if the device is the default device for its category. The converter is used to supply either an image or a null value to the image control depending on the value of the IsDefaultDevice property. Listing 10-35 shows the code behind for the Click event on the button that starts video capture. Listing 10-35. Click event handler for btnStartCamera //currently attached CaptureSource CaptureSource currentCaptureSource = null; private void btnStartCamera_Click(object sender, RoutedEventArgs e) {

//if the capture source is not null and there is an ongoing capture //lets stop it if (currentCaptureSource != null && currentCaptureSource.State == CaptureState.Started) currentCaptureSource.Stop(); //initialize new capture source //set VideoCaptureDevice with the user selected one or the default //if none selected. Do the same with the AudioCaptureDevice currentCaptureSource = new CaptureSource() { VideoCaptureDevice = cbxVideoDevices.SelectedItem == null CaptureDeviceConfiguration.GetDefaultVideoCaptureDevice() : cbxVideoDevices.SelectedItem as VideoCaptureDevice, AudioCaptureDevice = cbxAudioDevices.SelectedItem == null CaptureDeviceConfiguration.GetDefaultAudioCaptureDevice() : cbxAudioDevices.SelectedItem as AudioCaptureDevice }; //if device access has been successfully requested before //of if not , and this device access request is unsuccessful as well //return if (!CaptureDeviceConfiguration.AllowedDeviceAccess && CaptureDeviceConfiguration.RequestDeviceAccess() == false) return; //access granted - start capture currentCaptureSource.Start(); //create a VideoBrush VideoBrush captureBrush = new VideoBrush() { Stretch = Stretch.Fill }; //set the videobrush to use the CaptureSource captureBrush.SetSource(currentCaptureSource); //paint a border background with the videobrush brdrOutput.Background = captureBrush; //handle the CaptureImageCompleted for still images currentCaptureSource.CaptureImageCompleted += new EventHandler<CaptureImageCompletedEventArgs>((s, args) => { //add the image taken (WriteableBitmap) to the host collection obscollSnapsTaken.Add(args.Result); }); }

Though you ve learned how to separate control code from the view, ZK provides a way to declare variables or methods within the ZUML page directly when necessary using the zscript element. Besides, ZK also supports EL expressions for accessing variables defined within zscript element. Their uses are introduced in the following paragraphs.

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