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Drawing to and resizing Windows Form object

Posted on 2011-02-28
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Last Modified: 2012-05-11
I have a Form object that is the child of another Form object.  The child form captures key strokes and places them in a string object.  Using Graphics.DrawString() to display the contents of the string in the child form works fine, until the child form is resized to be wider than its initial width.  After that, DrawString ceases to display the part of the string that is beyond the child form's original width.  Any ideas?  I am displaying the string in the upper-left corner of the child form, from left to right.

Thanks!
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Question by:redman07
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5 Comments
 
LVL 86

Expert Comment

by:Mike Tomlinson
ID: 35001400
Can we see some code?

How about starting with the drawing portion?
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Author Comment

by:redman07
ID: 35002317
Here are the places where the DrawString happens.  I've removed some non-essential code that deals with the caret and some command keys.

private void EdntrChildForm_KeyPress(object sender, KeyPressEventArgs e)
{
   switch ( e.KeyChar )
   {
      case '\b':
      case '\r':
      case '\n':
         break;
      default:			
         m_sText += e.KeyChar;
   }

   m_oformGraphics.FillRectangle(
      new SolidBrush( SystemColors.Window ),
      new RectangleF( new Point( 0, 0 ),
         m_oformGraphics.MeasureString( m_sText, m_oFont, Point.Empty,
         StringFormat.GenericTypographic ) ) );

   m_oformGraphics.DrawString( m_sText, m_oFont,
      new SolidBrush( SystemColors.WindowText ), 0, 0,
      StringFormat.GenericTypographic );

} // KeyPress()

protected void EdntrChildForm_Paint( object s, PaintEventArgs e )
{

   m_oformGraphics.DrawString( m_sText, m_oFont,
      new SolidBrush( SystemColors.WindowText ),
      0, 0 ), StringFormat.GenericTypographic );

} // Paint()

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LVL 86

Accepted Solution

by:
Mike Tomlinson earned 500 total points
ID: 35002880
It's probably your use of "m_oformGraphics".  You should be using the Graphics supplied in the Paint() event via "e.Graphics".

I'm guessing you used "this.CreateGraphics" and assigned that to the variable?
*That's rarely the right approach...

Something more like this might work better:
private void EdntrChildForm_KeyPress(object sender, KeyPressEventArgs e)
{
   switch ( e.KeyChar )
   {
      case '\b':
      case '\r':
      case '\n':
         break;
      default:			
         m_sText += e.KeyChar;
   }

   this.Refresh(); // <-- Force a Repaint
} // KeyPress()

protected void EdntrChildForm_Paint( object s, PaintEventArgs e )
{
   // Use "e.Graphics" to draw with:
   e.Graphics.FillRectangle(
      new SolidBrush( SystemColors.Window ),
      new RectangleF( new Point( 0, 0 ),
         m_oformGraphics.MeasureString( m_sText, m_oFont, Point.Empty,
         StringFormat.GenericTypographic ) ) );
   e.Graphics.DrawString( m_sText, m_oFont,
      new SolidBrush( SystemColors.WindowText ), 0, 0,
      StringFormat.GenericTypographic );
} // Paint()

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Author Closing Comment

by:redman07
ID: 35003041
That's it.  I did use CreateGraphics().  Thanks for the insightful solution, and the tip!

Now if I can just find out how to get characters to display in a consistently spaced-out manner, and place the caret between them accordingly.   I remember in the old-days that GetTextExtent2 did a great job of helping with that kind of thing.
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LVL 86

Expert Comment

by:Mike Tomlinson
ID: 35003063
You can use a monospaced font...

Or possibly use the Graphics.MeasureCharacterRanges() function to get bounding rectangles for each letter in your string:
http://msdn.microsoft.com/en-us/library/system.drawing.graphics.measurecharacterranges.aspx
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