protected internal virtual void RenderRecursive(DrawingContext dc)
{
Debug.Assert(this.IsMeasureValid && this.IsArrangeValid);
dc.Translate(_offsetX, _offsetY);
dc.PushClippingRectangle(0, 0, _renderWidth, _renderHeight);
try
{
Debug.Assert(this.Visibility == Visibility.Visible);
if (!dc.EmptyClipRect)
{
OnRender(dc);
UIElementCollection children = _logicalChildren;
if (children != null)
{
int n = children.Count;
for (int i = 0; i < n; i++)
{
UIElement child = children[i];
if (child.IsRenderable())
{
child.RenderRecursive(dc);
}
}
}
}
}
finally
{
dc.PopClippingRectangle();
dc.Translate(-_offsetX, -_offsetY);
//-------------------------------------------------------------------------------
// Reset the render flags.
_flags &= ~(Flags.IsSubtreeDirtyForRender | Flags.IsDirtyForRender);
}
}
/// <summary>
/// This is the standard RenderMessageHandler callback, posted via PostRender()
/// and Resize(). This wraps RenderMessageHandlerCore and emits an ETW events
/// to trace its execution.
/// </summary>
internal object RenderMessageHandler(object arg)
{
try
{
_isRendering = true;
//_screen.Clear();
if (_invokeOnRenderCallbacks != null)
{
int callbackLoopCount = 0;
int count = _invokeOnRenderCallbacks.Count;
while (count > 0)
{
callbackLoopCount++;
if (callbackLoopCount > 153)
{
throw new InvalidOperationException("infinite loop");
}
InvokeOnRenderCallback[] callbacks;
lock (_invokeOnRenderCallbacks)
{
count = _invokeOnRenderCallbacks.Count;
callbacks = new InvokeOnRenderCallback[count];
_invokeOnRenderCallbacks.CopyTo(callbacks);
_invokeOnRenderCallbacks.Clear();
}
for (int i = 0; i < count; i++)
{
callbacks[i].DoWork();
}
count = _invokeOnRenderCallbacks.Count;
}
}
DrawingContext dc = new DrawingContext(_screen);
/* The dirty rectange MUST be read after the InvokeOnRender callbacks are
* complete, as they can trigger layout changes or invalidate controls
* which are expected to be redrawn. */
int x = _dirtyX0;
int y = _dirtyY0;
int w = _dirtyX1 - _dirtyX0;
int h = _dirtyY1 - _dirtyY0;
_dirtyX0 = _screenW; _dirtyY0 = _screenH;
_dirtyX1 = _dirtyY1 = 0;
try
{
if (w > 0 && h > 0)
{
//
// This is the big Render!
//
// We've now updated layout and the updated scene will be
// rendered.
dc.PushClippingRectangle(x, y, w, h);
_target.RenderRecursive(dc);
dc.PopClippingRectangle();
}
}
finally
{
dc.Close();
if (w > 0 && h > 0)
{
_screen.Flush(x, y, w, h);
}
}
}
finally
{
_currentRenderOp = null;
_isRendering = false;
}
return(null);
}
/// <summary>
/// This is the standard RenderMessageHandler callback, posted via PostRender()
/// and Resize(). This wraps RenderMessageHandlerCore and emits an ETW events
/// to trace its execution.
/// </summary>
internal object RenderMessageHandler(object arg)
{
try
{
_isRendering = true;
//_screen.Clear();
if (_invokeOnRenderCallbacks != null)
{
int callbackLoopCount = 0;
int count = _invokeOnRenderCallbacks.Count;
while (count > 0)
{
callbackLoopCount++;
if (callbackLoopCount > 153)
{
throw new InvalidOperationException("infinite loop");
}
InvokeOnRenderCallback[] callbacks;
lock (_invokeOnRenderCallbacks)
{
count = _invokeOnRenderCallbacks.Count;
callbacks = new InvokeOnRenderCallback[count];
_invokeOnRenderCallbacks.CopyTo(callbacks);
_invokeOnRenderCallbacks.Clear();
}
for (int i = 0; i < count; i++)
{
callbacks[i].DoWork();
}
count = _invokeOnRenderCallbacks.Count;
}
}
DrawingContext dc = new DrawingContext(_screen);
/* The dirty rectange MUST be read after the InvokeOnRender callbacks are
* complete, as they can trigger layout changes or invalidate controls
* which are expected to be redrawn. */
int x = _dirtyX0;
int y = _dirtyY0;
int w = _dirtyX1 - _dirtyX0;
int h = _dirtyY1 - _dirtyY0;
_dirtyX0 = _screenW; _dirtyY0 = _screenH;
_dirtyX1 = _dirtyY1 = 0;
try
{
if (w > 0 && h > 0)
{
//
// This is the big Render!
//
// We've now updated layout and the updated scene will be
// rendered.
dc.PushClippingRectangle(x, y, w, h);
_target.RenderRecursive(dc);
dc.PopClippingRectangle();
}
}
finally
{
dc.Close();
if (w > 0 && h > 0)
{
_screen.Flush(x, y, w, h);
}
}
}
finally
{
_currentRenderOp = null;
_isRendering = false;
}
return null;
}
public override void OnRender(DrawingContext dc)
{
if (_pushClippingRectangle)
{
try
{
dc.PushClippingRectangle(x0, y0, xDimension, yDimension);
}
catch (ArgumentException ex)
{
Log.Comment("Caught " + ex.Message + " when Pushing a clipping rectangle at (" + x0 + ", " + y0 + ")" +
" and Width = " + xDimension + " Height = " + yDimension);
_argumentException = true;
}
}
if (_popClippingRectangle)
{
dc.PopClippingRectangle();
}
if (_getClippingRectangle)
{
dc.GetClippingRectangle(out x1, out y1, out wd, out ht);
}
if (_drawLine)
{
dc.DrawLine(_pen, x0, y0, x1, y1);
}
if (_drawRectangle)
{
try
{
dc.DrawRectangle(_brush, _pen, r, s, xDimension, yDimension);
}
catch (ArgumentException ex)
{
Log.Comment("Caught " + ex.Message + " when drawing a Rectangle at (" + r + ", " + s + ")" +
" Width = " + xDimension + " Height = " + yDimension);
_argumentException = true;
}
}
if (_drawEllipse)
{
dc.DrawEllipse(_brush, _pen, r, s, xDimension, yDimension);
}
if (_drawPolygon)
{
dc.DrawPolygon(_brush, _pen, pts);
}
if (_clear)
{
dc.Clear();
}
if (_setPixel)
{
dc.SetPixel(_color, r, s);
}
if (_drawImage)
{
try
{
dc.DrawImage(bmp1, r, s);
}
catch (NullReferenceException ex)
{
Log.Comment("Caught " + ex.Message + " when drawing a null Image");
_nullReferenceException = true;
}
}
if (_drawCroppedImage)
{
try
{
dc.DrawImage(bmp1, r, s, x0, y0, xDimension, yDimension);
}
catch (ArgumentException ex)
{
Log.Comment("Caught " + ex.Message + " when drawing an Image at (" + r + ", " + s + ")" +
"from a source Image at(" + x0 + ", " + y0 + ") Width = " + xDimension + " Height = " + yDimension);
_argumentException = true;
}
catch (NullReferenceException ex)
{
Log.Comment("Caught " + ex.Message + " when drawing a null Image");
_nullReferenceException = true;
}
}
if (_translate)
{
dc.Translate(r, s);
}
if (_blendImage)
{
dc.BlendImage(bmp2, x0, y0, x1, y1, xDimension, yDimension, _opacity);
}
if (_drawText)
{
_textFits = dc.DrawText(ref _str, _font, _color, r, s, xDimension, yDimension, _alignment, _trimming);
}
base.OnRender(dc);
_pBitmap = dc.Bitmap;
Master_Media.autoEvent.Set();
}
