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    <p>I have created the required general transparency control, the solution was a detailed breakdown of the control and all of its siblings in the parent, and preparing a recursive drawing routine on the OnPaintBackground() method relying on the InvokePaint() and InvokePaintBackground() methods. By defining successively smaller clips and intersecting with lower controls, this method minimises drawing overhead.</p> <ul> <li><p>The complete control includes a method of detecting and responding to sibling controls' Invalidate methods, efficiently drawing the stack of transparent controls and effectively allowing full alpha channel overlays on animated underlying controls.</p></li> <li><p>The control can be interleaved with all permutations of child and parent controls while giving visually accurate transparency.</p></li> <li><p>Hit testing has not been considered in the control.</p></li> <li><p>This control will not overdraw controls whose drawing is not performed during paint events. This is a big limitation.</p></li> <li><p>To use the control one simply inherits from the base and overrides the OnPaint method to perform custom drawing. It is also possible to override the OnPaintBackground method so long as a call to the base method is called first.</p></li> </ul> <p>Finally, if anyone would like the full code including invalidation handling, let me know. If you have a solution to system drawn components let me know that too. Also if you have a more trivial solution that implies I wasted a bunch of time on this, I wouldn't be upset about receiving that either!</p> <p><img src="https://i.stack.imgur.com/v6o6L.png" alt="enter image description here"></p> <p>An excerpt of the control on the OnPaintBackground method is presented:</p> <pre><code>''' &lt;summary&gt; ''' Recursively paint all underlying controls in their relevant regions, stacking drawing operations as necessary. ''' &lt;/summary&gt; ''' &lt;param name="pevent"&gt;&lt;/param&gt; ''' &lt;remarks&gt;&lt;/remarks&gt; Protected Overrides Sub OnPaintBackground(pevent As System.Windows.Forms.PaintEventArgs) 'Store clip and transform for reversion Dim initialClip As Region = pevent.Graphics.Clip Dim initialTransform As Drawing2D.Matrix = pevent.Graphics.Transform 'Develop list of underlying controls Dim submarinedControls As New List(Of Control) For Each Control As Control In m_Siblings If Control.Visible AndAlso Above(Control) AndAlso Me.ClientRectangle.IntersectsWith(Control.RelativeClientRectangle(Me)) Then submarinedControls.Add(Control) Next 'Prepare clip for parent draw Dim parentClip As System.Drawing.Region = New System.Drawing.Region(initialClip.GetRegionData) For Each Control As Control In submarinedControls parentClip.Exclude(Control.RelativeClientRectangle(Me)) Next pevent.Graphics.Clip = parentClip 'Evaluate control relationship to parent, temporarily adjusting transformation for parent redraw. This translation must be relative since the incoming graphics may already have a meaningful transform applied. Dim translation As Point = Parent.RelationTo(Me) pevent.Graphics.Transform = New Drawing2D.Matrix(1, 0, 0, 1, initialTransform.OffsetX + translation.X, initialTransform.OffsetY + translation.Y) 'Fully draw parent background InvokePaintBackground(Parent, pevent) InvokePaint(Parent, pevent) 'Reset transform for sibling drawing pevent.Graphics.Transform = initialTransform 'Develop initial clip of submarined siblings Dim siblingClip As System.Drawing.Region = New System.Drawing.Region(initialClip.GetRegionData) siblingClip.Exclude(parentClip) For Each Control As Control In submarinedControls 'Define relative position of submarined sibling to self translation = Control.RelationTo(Me) 'Define and apply clip *before* transformation Dim intersectionClip As New Region(Control.RelativeClientRectangle(Me)) intersectionClip.Intersect(siblingClip) pevent.Graphics.Clip = intersectionClip 'Apply transformation pevent.Graphics.Transform = New Drawing2D.Matrix(1, 0, 0, 1, initialTransform.OffsetX + translation.X, initialTransform.OffsetY + translation.Y) 'Raise sibling control's paint events InvokePaintBackground(Control, pevent) InvokePaint(Control, pevent) 'Revert transformation and exclude region pevent.Graphics.Transform = initialTransform siblingClip.Exclude(intersectionClip) Next 'Revert transform and clip to pre-drawing state pevent.Graphics.Transform = initialTransform pevent.Graphics.Clip = initialClip End Sub </code></pre>
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    1. POWhat is a general solution to creating a transparent control?
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    1. USJ Collins
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    1. COCan I have the full code? It`d be helpful for me
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    2. COUnfortunately I no longer have access to the code base containing my solution. What isn't working in your implementation?
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    3. COThank you for your help, but I already solved my problem with the TranspControl from codeproject.
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