/// <summary>
/// Call back function for take snapshot command dependency property,
/// when no video device source selected show appropriate message
/// or message currently display in user-control based on user input.
/// </summary>
/// <exception cref="InvalidOperationException">Wraps and throws <see cref="InvalidOperationException"/> when any exception is thrown from this method.</exception>
public void TakeSnapshotCallback()
{
try
{
var playerPoint = new System.Drawing.Point();
//// Get the position of the source video device player.
if (string.IsNullOrWhiteSpace(VideoSourceId))
{
var noVideoDeviceSourcePoint = NoVideoSourceGrid.PointToScreen(new Point(0, 0));
playerPoint.X = (int)noVideoDeviceSourcePoint.X;
playerPoint.Y = (int)noVideoDeviceSourcePoint.Y;
}
else
{
playerPoint =
VideoSourcePlayer.PointToScreen(new System.Drawing.Point(VideoSourcePlayer.ClientRectangle.X,
VideoSourcePlayer.ClientRectangle.Y));
}
if (double.IsNaN(VideoPreviewWidth) || double.IsNaN(VideoPreviewHeight))
{
using (
var bitmap = new Bitmap((int)VideoSourceWindowsFormsHost.ActualWidth,
(int)VideoSourceWindowsFormsHost.ActualHeight))
{
using (var graphicsFromImage = Graphics.FromImage(bitmap))
{
graphicsFromImage.CopyFromScreen(playerPoint,
System.Drawing.Point.Empty,
new System.Drawing.Size((int)VideoSourceWindowsFormsHost.ActualWidth,
(int)VideoSourceWindowsFormsHost.ActualHeight));
}
SnapshotBitmap = new Bitmap(bitmap);
}
}
else
{
using (var bitmap = new Bitmap((int)VideoPreviewWidth, (int)VideoPreviewHeight))
{
using (var graphicsFromImage = Graphics.FromImage(bitmap))
{
graphicsFromImage.CopyFromScreen(playerPoint,
System.Drawing.Point.Empty,
new System.Drawing.Size((int)VideoPreviewWidth, (int)VideoPreviewHeight));
}
SnapshotBitmap = new Bitmap(bitmap);
}
}
}
catch (Exception exception)
{
throw new InvalidOperationException(
"Error occurred while trying to take snapshot from currently selected source video device",
exception);
}
}