Overriding Button Class Text.set and OnPaint

  • Thread starter Thread starter Ben
  • Start date Start date
B

Ben

I'm having a really hard time trying to figure out how to override
the
drawing in my class derived from Button. When I set the text
property, the drawing seems to be taking place in the set method. I
try to override OnPaint and VS never even stops on my OnPaint
breakpoint. I try overriding set, but I have no idea how to get the
Graphics object from the control. I'm trying to develop games for
Windows Mobile 5.x, and it won't let me use the Control classes
CreateGraphics function.

Please help! Thank you!
 
Hi,


Ben said:
I'm having a really hard time trying to figure out how to override
the
drawing in my class derived from Button. When I set the text
property, the drawing seems to be taking place in the set method. I
try to override OnPaint and VS never even stops on my OnPaint
breakpoint. I try overriding set, but I have no idea how to get the
Graphics object from the control.
Click to expand...

The second parameter of the onPaint gives you access to the Graphics
instance you need to use.


I'm trying to develop games for
Windows Mobile 5.x, and it won't let me use the Control classes
CreateGraphics function.
Click to expand...

CF is a just a subset of the framework, there are a lot of classes/methods
not present.
 
Hi,




The second parameter of the onPaint gives you access to the Graphics
instance you need to use.

I'm trying to develop games for


CF is a just a subset of the framework, there are a lot of classes/methods
not present.
Click to expand...

my OnPaint function never gets executed.
 
Here is my class:

using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
using System.Drawing;
using System.Drawing.Text;

namespace System.Windows.Forms
{
class SButton: Button
{
List<int> small_nums = new List<int>();
int my_x;
int my_y;

public SButton(int new_my_x, int new_my_y)
{
my_x = new_my_x;
my_y = new_my_y;
}

public int get_my_x()
{
return my_x;
}

public int get_my_y()
{
return my_y;
}

public override string Text
{
get
{
return base.Text;
}
set
{
base.Text = value;
}
}

void draw_small_nums(PaintEventArgs p)
{
Graphics g = p.Graphics;
Font small_font = new Font(FontFamily.GenericSansSerif, 8,
FontStyle.Regular);
RectangleF small_text_rect = new RectangleF();
string small_nums_text;

foreach (int i in small_nums)
{
switch (i)
{
case 0: default:
small_nums_text = "0";
small_text_rect.X = 0;
small_text_rect.Y = 0;
break;
}

g.DrawString(small_nums_text, small_font, null,
small_text_rect);
}
}

public void add_small_num()
{
}

public void remove_small_num()
{
}

protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
draw_small_nums(e);
}
}
}
 
Hi,

That;s weird, it should be executed

Is this a CF app ?
Click to expand...

Yes, it is a CF project, and I am using the Pocket PC Emulator to test
it on VS Orcas Beta 1.
If I switch the parent class from a Button to an Image, everything
works fine.
Apparently, not all of the standard controls use OnPaint().
Apparenty, Button is one of them for CF projects, but not for non CF
projects, beause I've seem several examples of where people override
the OnPaint function of Button.
 
Hi,

Ben said:
Yes, it is a CF project, and I am using the Pocket PC Emulator to test
it on VS Orcas Beta 1.
Click to expand...

CF has a lot of restrictions. go to opennetcf.org and see the
owneddrawcontrol example there.

Additionally consider posting Cf related questions in the CF NG
 
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