/// <summary>
/// Unloads camera device, if needed.
/// </summary>
/// <returns>Awaitable task.</returns>
public async Task UnloadCameraAsync()
{
if (this.camera == null || this.State == MainPageViewModelState.Unloaded)
{
return;
}
this.State = MainPageViewModelState.Unloaded;
this.PreviewBrush = null;
this.continuousAutoFocusEnabled = false;
this.camera.FocusChanged -= this.CameraOnFocusChanged;
this.camera.PhotoCaptured -= this.CameraOnPhotoCaptured;
this.camera.CaptureStopped -= this.CameraOnCaptureStopped;
await this.camera.UnloadCameraAsync();
this.camera = null;
EventHandler handler = this.CameraUnloaded;
if (handler != null)
{
handler.Invoke(this, EventArgs.Empty);
}
}
/// <summary>
/// Loads camera device, if needed.
/// </summary>
/// <param name="areaSize">The size of the area available for the video preview.</param>
/// <returns>Awaitable task.</returns>
public async Task EnsureCameraLoadedAsync(Size areaSize)
{
if (this.camera != null)
{
// Make sure the the correct camera is loaded.
if (this.camera.CameraType == this.CameraType && this.State != MainPageViewModelState.Unloaded)
{
Tracing.Trace("MainPageViewModel: {0} camera is already loaded.", this.CameraType);
return;
}
await this.UnloadCameraAsync();
}
this.State = MainPageViewModelState.Loading;
this.camera = await this.cameraProvider.GetCameraAsync(this.CameraType);
this.cameraSettings = this.settingsProvider.GetCameraSettings(this.CameraType);
this.camera.Orientation = this.orientation;
this.previewAreaSize = areaSize;
await this.camera.LoadCameraAsync();
await this.StartPreviewAsync(this.previewAreaSize);
// Allow camera to automatically focus without user requests, if supported.
await this.TryToEnableContinuousAutoFocusAsync();
this.camera.FocusChanged += this.CameraOnFocusChanged;
this.camera.PhotoCaptured += this.CameraOnPhotoCaptured;
this.camera.CaptureStopped += this.CameraOnCaptureStopped;
this.PreviewSize = this.camera.PreviewSize;
this.PreviewBrush = this.camera.PreviewBrush;
this.FlashSupported = this.camera.FlashSupported;
await this.UpdatePhotoCaptureAsync();
this.State = MainPageViewModelState.Loaded;
EventHandler handler = this.CameraLoaded;
if (handler != null)
{
handler.Invoke(this, EventArgs.Empty);
}
}
/// <summary>
/// Unloads camera device, if needed.
/// </summary>
/// <returns>Awaitable task.</returns>
public async Task UnloadCameraAsync()
{
if (this.camera == null || this.State == MainPageViewModelState.Unloaded)
{
return;
}
this.State = MainPageViewModelState.Unloaded;
this.PreviewBrush = null;
this.continuousAutoFocusEnabled = false;
this.camera.FocusChanged -= this.CameraOnFocusChanged;
this.camera.PhotoCaptured -= this.CameraOnPhotoCaptured;
this.camera.CaptureStopped -= this.CameraOnCaptureStopped;
await this.camera.UnloadCameraAsync();
this.camera = null;
EventHandler handler = this.CameraUnloaded;
if (handler != null)
{
handler.Invoke(this, EventArgs.Empty);
}
}
/// <summary>
/// Loads camera device, if needed.
/// </summary>
/// <param name="areaSize">The size of the area available for the video preview.</param>
/// <returns>Awaitable task.</returns>
public async Task EnsureCameraLoadedAsync(Size areaSize)
{
if (this.camera != null)
{
// Make sure the the correct camera is loaded.
if (this.camera.CameraType == this.CameraType && this.State != MainPageViewModelState.Unloaded)
{
Tracing.Trace("MainPageViewModel: {0} camera is already loaded.", this.CameraType);
return;
}
await this.UnloadCameraAsync();
}
this.State = MainPageViewModelState.Loading;
this.camera = await this.cameraProvider.GetCameraAsync(this.CameraType);
this.cameraSettings = this.settingsProvider.GetCameraSettings(this.CameraType);
this.camera.Orientation = this.orientation;
this.previewAreaSize = areaSize;
await this.camera.LoadCameraAsync();
await this.StartPreviewAsync(this.previewAreaSize);
// Allow camera to automatically focus without user requests, if supported.
await this.TryToEnableContinuousAutoFocusAsync();
this.camera.FocusChanged += this.CameraOnFocusChanged;
this.camera.PhotoCaptured += this.CameraOnPhotoCaptured;
this.camera.CaptureStopped += this.CameraOnCaptureStopped;
this.PreviewSize = this.camera.PreviewSize;
this.PreviewBrush = this.camera.PreviewBrush;
this.FlashSupported = this.camera.FlashSupported;
await this.UpdatePhotoCaptureAsync();
this.State = MainPageViewModelState.Loaded;
EventHandler handler = this.CameraLoaded;
if (handler != null)
{
handler.Invoke(this, EventArgs.Empty);
}
}