private void OnNeedPaint(object sender, NeedLayoutEventArgs e)
{
Debug.Assert(e != null);
// Validate incoming reference
if (e == null)
{
throw new ArgumentNullException(nameof(e));
}
// Pass request onto the displaying control if we have one
VisualContextMenu?.PerformNeedPaint(e.NeedLayout);
}
/// <summary>
/// Processes a notification from palette storage of a paint and optional layout required.
/// </summary>
/// <param name="sender">Source of notification.</param>
/// <param name="e">An NeedLayoutEventArgs containing event data.</param>
/// <exception cref="ArgumentNullException"></exception>
protected virtual void OnNeedPaint(object sender, NeedLayoutEventArgs e)
{
Debug.Assert(e != null);
// Validate incoming reference
if (e == null)
{
throw new ArgumentNullException(nameof(e));
}
// If required, layout the control
if (e.NeedLayout && !_layoutDirty)
{
_layoutDirty = true;
}
if (IsHandleCreated && (!_refreshAll || !e.InvalidRect.IsEmpty))
{
// Always request the repaint immediately
if (e.InvalidRect.IsEmpty)
{
_refreshAll = true;
Invalidate();
}
else
{
Invalidate(e.InvalidRect);
}
// Do we need to use an Invoke to force repaint?
if (!_refresh && EvalInvokePaint)
{
BeginInvoke(_refreshCall);
}
// A refresh is outstanding
_refresh = true;
}
}
/// <summary>
/// Processes a notification from palette storage of a paint and optional layout required.
/// </summary>
/// <param name="sender">Source of notification.</param>
/// <param name="e">An NeedLayoutEventArgs containing event data.</param>
/// <exception cref="ArgumentNullException"></exception>
protected virtual void OnNeedPaint(object sender, NeedLayoutEventArgs e)
{
Debug.Assert(e != null);
// Validate incoming reference
if (e == null)
{
throw new ArgumentNullException(nameof(e));
}
if (IsHandleCreated)
{
// Always request the repaint immediately
if (e.InvalidRect.IsEmpty)
{
Invalidate(true);
}
else
{
Invalidate(e.InvalidRect, true);
}
}
}
