internal void SaveWorkspaceAsImage(string path)
{
var initialized = false;
var bounds = new Rect();
double minX = 0.0, minY = 0.0;
var dragCanvas = WpfUtilities.ChildOfType <DragCanvas>(this);
var childrenCount = VisualTreeHelper.GetChildrenCount(dragCanvas);
for (int index = 0; index < childrenCount; ++index)
{
ContentPresenter contentPresenter = VisualTreeHelper.GetChild(dragCanvas, index) as ContentPresenter;
if (contentPresenter.Children().Count() < 1)
{
continue;
}
var firstChild = VisualTreeHelper.GetChild(contentPresenter, 0);
switch (firstChild.GetType().Name)
{
case "NodeView":
case "NoteView":
case "AnnotationView":
break;
// Until we completely removed InfoBubbleView (or fixed its broken
// size calculation), we will not be including it in our size
// calculation here. This means that the info bubble, if any, will
// still go beyond the boundaries of the final PNG file. I would
// prefer not to add this hack here as it introduces multiple issues
// (including NaN for Grid inside the view and the fix would be too
// ugly to type in). Suffice to say that InfoBubbleView is not
// included in the size calculation for screen capture (work-around
// should be obvious).
//
// case "InfoBubbleView":
// child = WpfUtilities.ChildOfType<Grid>(child);
// break;
// We do not take anything other than those above
// into consideration when the canvas size is measured.
default:
continue;
}
// Determine the smallest corner of all given visual elements on the
// graph. This smallest top-left corner value will be useful in making
// the offset later on.
//
var childBounds = VisualTreeHelper.GetDescendantBounds(contentPresenter as Visual);
minX = childBounds.X < minX ? childBounds.X : minX;
minY = childBounds.Y < minY ? childBounds.Y : minY;
childBounds.X = (double)(contentPresenter as Visual).GetValue(Canvas.LeftProperty);
childBounds.Y = (double)(contentPresenter as Visual).GetValue(Canvas.TopProperty);
if (initialized)
{
bounds.Union(childBounds);
}
else
{
initialized = true;
bounds = childBounds;
}
}
// Nothing found in the canvas, bail out.
if (!initialized)
{
return;
}
// Add padding to the edge and make them multiples of two (pad 10px on each side).
bounds.Width = 20 + ((((int)Math.Ceiling(bounds.Width)) + 1) & ~0x01);
bounds.Height = 20 + ((((int)Math.Ceiling(bounds.Height)) + 1) & ~0x01);
var currentTransformGroup = WorkspaceElements.RenderTransform as TransformGroup;
WorkspaceElements.RenderTransform = new TranslateTransform(10.0 - bounds.X - minX, 10.0 - bounds.Y - minY);
WorkspaceElements.UpdateLayout();
var rtb = new RenderTargetBitmap(((int)bounds.Width),
((int)bounds.Height), 96, 96, PixelFormats.Default);
rtb.Render(WorkspaceElements);
WorkspaceElements.RenderTransform = currentTransformGroup;
try
{
using (var stm = System.IO.File.Create(path))
{
// Encode as PNG format
var pngEncoder = new PngBitmapEncoder();
pngEncoder.Frames.Add(BitmapFrame.Create(rtb));
pngEncoder.Save(stm);
}
}
catch (Exception)
{
}
}
private void OnLoaded(object sender, RoutedEventArgs e) => _contentTextBlock = _contentPresenter.Children().OfType <TextBlock>().FirstOrDefault();
