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POChanging border of Control
 

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    <p>Im having a problem with setting custom border of Control. This border can be done with DrawRectangle, DrawBorder or anything else as long as I get this behaviour</p> <p><img src="https://i.stack.imgur.com/WCijd.jpg" alt="enter image description here"></p> <p>Obviously, the darkest border is where previouse border was. Other borders are around it trying to mimic fade out(or whatever). Now, the most challenging thing is I cannot override OnPaint or extend any other Control. This HAS to work on all Controls! This is part of my extender provider whith which I set these borders when control has focus(like Google Chrome).</p> <p>So far I have come up with this... When adding controls in extender provider dictionary I hook up on Enter and Leave events of control. In there I get the parent of the control that is firing the event and on that form I draw these 3 rectangles. That way I sorted painting on non client area. The thing that remains is painting the actual border of control. I have tried and tried but to no avail.</p> <p>I also hooked up on paint event of that control but ControlPaint.DrawBorder() is not working.</p> <p>Okay, so this is method that is getting called on Enter and leave.</p> <pre><code>private void BojajGlow(Graphics gfx, Graphics gfxCtrl, Control parent, Control kontrola, bool novi) { Rectangle[] rect = new Rectangle[3]; for (int i = 0; i &lt; 3; i++) { int x = kontrola.Location.X - (i + 1); int y = kontrola.Location.Y - (i + 1); int w = kontrola.Size.Width + 2 * (i + 1) - 1; int h = kontrola.Size.Height + 2 * (i + 1) - 1; rect[i] = new Rectangle(x, y, w, h); } if (novi) { Color boja = DohvatiOpcije(kontrola).Boja; for (int i = 0; i &lt; 3; i++) { if (i &gt; 0) boja = Posvjetli(95, ControlPaint.Light(boja)); Pen olovka = new Pen(boja); olovka.EndCap = olovka.StartCap = LineCap.Round; olovka.Width = 1; GraphicsPath gfxPath = new GraphicsPath(); gfxPath.AddRectangle(rect[i]); gfx.DrawPath(olovka, gfxPath); } } else { for (int i = 0; i &lt; 3; i++) { Pen olovka = new Pen(parent.BackColor); olovka.EndCap = olovka.StartCap = LineCap.Round; olovka.Width = 1; GraphicsPath gfxPath = new GraphicsPath(); gfxPath.AddRectangle(rect[i]); gfx.DrawPath(olovka, gfxPath); } } } </code></pre> <p>From Enter event it is going to be called like this</p> <pre><code>if (((Control)sender).Parent != null) BojajGlow(Graphics.FromHwnd(((Control)sender).Parent.Handle), Graphics.FromHwnd(((Control)sender).Handle), ((Control)sender).Parent, (Control)sender, true); </code></pre> <p>Does anyone have any valuable input on this?</p>
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    1. COAre you using WinForms or WPF?
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      1. USBernard
    2. COI am using WinForms. I don't know WPF but I've seen some examples in it where this is trivial to achieve :)
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      1. USRob
    3. COThe border is drawn using the user selected theme settings with the default handler for the WM_NCPAINT message. A difficult message to deal with. Simplest way is to just use borderless controls and let the parent draw a border.
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