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.NET Forum / Languages / C# / January 2008A forms drawing problem
I have a window drawing problem that I hope someone may be able to help with. I basically have a form and a control in the form which is docked to fill. I want to resize the form and get the docked control to resize smoothly with the form. The problem is that the form and the control are being painted separately. So you see the form resize and then the docked control. Ideally I want them both to resize, paint to the buffer and then draw to the screen. I can not use manual painting as the control I am using I have no access to the source code. Does anyone have any suggestions as to how I might do this? > I have a window drawing problem that I hope someone may be able to > help with. [quoted text clipped - 10 lines] > > Does anyone have any suggestions as to how I might do this? Just how is the control "docked"? Using the Anchor property? Dock = Fill > Dock = Fill I personally have never used the Dock property, but I just ran a test on a simple form with one listbox control that was set to Dock Fill. When I resize the form, the listbox resizes virtually at the same time the form does. I am using VS2005. >I personally have never used the Dock property How do you live without this. It is one of the most useful properties a Control has. > When I resize the form, the listbox resizes virtually at the same time > the form does. Unfortunately virtually is not quite good enough for me. I need it to appear smooth. This is a graphics app where the appearance is important. Also you will find that as you increase the complexity of the control it becomes more obvious. Thanks for your help! Have you tried setting the Form's DoubleBuffered property to true? > Have you tried setting the Form's DoubleBuffered property to true? Yes, thanks! I almost mentioned this in the post because I knew it would come up. When you set double buffering it only double buffers what is directly drawn to your form. It has no effect on the child controls in the form. For graphics applications you should always: Set the double buffering of the control on. Set the ControlStyles to use UserPaint. Override OnPaintBackground so that PaintBackground does not call the base class. Do your painting as efficiently as possible.  Signature-- Bob Powell [MVP] Visual C#, System.Drawing Ramuseco Limited .NET consulting http://www.ramuseco.com Find great Windows Forms articles in Windows Forms Tips and Tricks http://www.bobpowell.net/tipstricks.htm Answer those GDI+ questions with the GDI+ FAQ http://www.bobpowell.net/faqmain.htm All new articles provide code in C# and VB.NET. Subscribe to the RSS feeds provided and never miss a new article. >> Have you tried setting the Form's DoubleBuffered property to true? > > Yes, thanks! I almost mentioned this in the post because I knew it > would come up. When you set double buffering it only double buffers > what is directly drawn to your form. It has no effect on the child > controls in the form. > >I personally have never used the Dock property > > How do you live without this. It is one of the most useful properties > a Control has. I have never designed a form that had only one control on it and it had to fill up the entire form. > > When I resize the form, the listbox resizes virtually at the same time > > the form does. [quoted text clipped - 5 lines] > > Thanks for your help! You might try doing the resizing yourself in the Form_Resize event. The .NET code may have unnecessary overhead that is slowing it down. Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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