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How do I catch all WM_PAINT message from all control

Posted on 2007-11-30
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Last Modified: 2008-02-01
Hi Experts,

I got stuck when trying implementing a method to catch WM_PAINT message from all control. When I run my apps, the UI seems freeze.
Does anything wrong with my code ?
public partial class frmMain : Form
{
        CustomFilter c = new CustomFilter();
 
        #region Form Method
        public frmMain()
        {
            InitializeComponent();
        }
        private void frmMain_Load(object sender, EventArgs e)
        {
            Application.AddMessageFilter(c);          
 
            c.Redraw += new AllControlRedraw(RedrawLine);
        }
 
        void RedrawLine()
        {
            IntPtr handle = Win32Helper.GetDesktopWindow();
            IntPtr hDc = Win32Helper.GetWindowDC(handle);
 
            Graphics g = Graphics.FromHdc(hDc);
            Pen p = new Pen(Color.Red, 2);
 
            Point[] StartLine = new Point[] { new Point(40, 10) };
            Point[] EndLine = new Point[] { new Point(40, 200) };
 
            for (int i = 0; i < StartLine.Length; i++)
                g.DrawLine(p, this.PointToScreen(StartLine[i]), this.PointToScreen(EndLine[i]));
 
            g.Dispose();
            Win32Helper.ReleaseDC(handle, hDc);
        }
}
 
    public delegate void AllControlRedraw(object sender, System.EventArgs e);
 
    class CustomFilter : System.Windows.Forms.IMessageFilter
    {
        private const int WM_PAINT = 0x000F;
        public event AllControlRedraw Redraw;
 
        #region IMessageFilter Members
 
        public bool PreFilterMessage(ref System.Windows.Forms.Message m)
        {
            AllControlRedraw t = Redraw;
            if (t != null)
            {
                switch (m.Msg)
                {
                    case WM_PAINT:
                        t(this, new EventArgs());
                        break;
                }
            }
 
            return true;
        }
 
        #endregion
 
        
    }

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Question by:Aryo1
1 Comment
 
LVL 3

Accepted Solution

by:
wizrr earned 2000 total points
ID: 20386150
Ofcourse

http://msdn2.microsoft.com/en-us/library/system.windows.forms.imessagefilter.prefiltermessage.aspx

Retuen value:
true to filter the message and stop it from being dispatched; false to allow the message to continue to the next filter or control.

You should return false.

Anyway your drawing code will be replaced with control's drawing code. Maybe you should subclass all windows in your app? (i think this is crazy idea)
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