protected internal override void RenderRecursive(DrawingContext dc)
{
base.RenderRecursive(dc);
PostRenderEventHandler postRenderHandler = this._postRenderHandler;
if (postRenderHandler == null)
{
return;
}
postRenderHandler(dc);
}
/// <summary>
/// Renders an individual 'part' of the control knob
/// </summary>
/// <param name="e"></param>
/// <param name="bounds">Bounding rectangle</param>
/// <param name="preRender">User PreRender callout</param>
/// <param name="postRender">User PostRender callout</param>
/// <param name="internalRender">Internal render callout</param>
private void RenderPart(PaintEventArgs e, Rectangle bounds,
PreRenderEventHandler preRender, PostRenderEventHandler postRender,
InternalRender internalRender)
{
bool cancel = false;
// If the user wants to PreRender the control
// then callout to their associated handler
if (preRender != null)
{
PreRenderEventArgs ev =
new PreRenderEventArgs(e.Graphics, e.ClipRectangle, bounds);
preRender(this, ev);
cancel = ev.Cancel;
}
// If our internal rendering was not canceled
// by the user (via the PreRender event), then
// perform our own rendering of the control
if (cancel == false)
{
internalRender(e);
// If the user cancelled our internal rendering
// then their is no need to PostRender, but if not
// then we need to give them another shot at the
// rendering process
if (postRender != null)
{
PostRenderEventArgs ev =
new PostRenderEventArgs(e.Graphics, e.ClipRectangle, bounds);
postRender(this, ev);
}
}
}