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POHow to draw child controls and custom drawings in expected order?
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  1. POHow to draw child controls and custom drawings in expected order?
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    copied!<p>I have control with custom drawings, let's call it <code>Surface</code>.</p> <p>I want to embed some winforms controls into that <code>Surface</code>. But also I want to draw some custom drawings (connectors), depending on controls location, size, etc.</p> <p>I tried to give the responsibility to draw those connectors to child controls themselves, so any of my child control was just bigger in size and included all the necessary drawings. I used <code>Parent.InvokePaint</code> call to draw parent background when needed (and I also tried transparent background). </p> <p><strong>The drawback</strong>: when parent background is painted inside child <code>OnPaint</code> event it erases all the other same controls already painted. The picture below shows the result. Colored areas are the child controls content.</p> <p><img src="https://i.stack.imgur.com/AgojS.png" alt="enter image description here"></p> <p>I also tried to give the responsibility to draw connectors to <code>Surface</code> and add child controls to <code>Surface.Controls</code> list. </p> <p><strong>The drawback</strong>: child control are always drawn on top of my custom drawing (which happens in <code>Surface.OnPaint</code>), because their painting happens somewhen later in the queue.</p> <p><img src="https://i.stack.imgur.com/2ifwg.png" alt="enter image description here"></p> <p>My requirements are:</p> <p>I need workable controls inside my <code>Surface</code> (receiving any mouse and keyboard event, focusable, etc). Every control would have some custom-drawn connectors to show context on surface. And when controls are overlapped I want everything to appear in expected order.</p> <p>How to achieve this?</p>
 

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