Using postmessage to interoperate? - C# Discussion Boards

Re: WindowsControl Background

9-Sep-03 5:14

I want to paint some colors on the background of my costom windows control and have some button and ... on it.If I overriden the OnPaint and do my painting there,It draw them in front of all things and nothing else is shown.How can I paint background and add controls in front of it?

Thanks

Mazy

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sumeat9-Sep-03 10:14

sumeat

9-Sep-03 10:14

I tried the same and it works.

The background color of the custom control did not hide any controls on it.

How are you doing it? Can you paste your code or some pseudo-code

Suhas

Re: WindowsControl Background

Mazdak9-Sep-03 21:53

Using postmessage to interoperate?

9-Sep-03 21:53

Simply add this lines to th control:

private void UserControl1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
{
	Rectangle rect = new Rectangle(0,0,this.Size.Width,this.Size.Height);
	e.Graphics.FillRectangle(new System.Drawing.Drawing2D.LinearGradientBrush(rect,m_bkcolor1,m_bkcolor2,m_lineargradientmode),rect);
}

But I after I add these two styles it works correctly,but I think it should be works without these two styles too:

this.SetStyle(ControlStyles.UserPaint,true);
this.SetStyle(ControlStyles.AllPaintingInWmPaint,true);

Mazy

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mcgahanfl9-Sep-03 5:02

Re: Using postmessage to interoperate?

9-Sep-03 5:02

What I would really like to do is tell the parent control to send a button click to a child control. In C++ it would be this

pParent->SendMessage( WM_COMMAND, MAKEWPARAM(ID_Of_CHILD, BN_CLICKED) );

Can you help me with this syntax or point me towards reading material? Below is my best effort. Thanks.

using System.Runtime.InteropServices;
public class Form1 : System.Windows.Forms.Form
{
[DllImport("user32.dll")]
protected static extern int PostMessage(
IntPtr wnd,
uint Msg,
IntPtr wParam,
IntPtr lParam);
.
.
.

private void button1_Click(object sender, System.EventArgs e)
{
*
#define BN_CLICKED 0
#define BN_PAINT 1
#define BN_HILITE 2
#define BN_UNHILITE 3
#define BN_DISABLE 4
#define BN_DOUBLECLICKED 5
*/

const uint WM_COMMAND = 0x0111;
const uint BN_CLICKED = 0x0000;
PostMessage((IntPtr)BusinessRules.Handle, WM_COMMAND, (IntPtr)BN_CLICKED, (IntPtr)IntPtr.Zero);

}

private void BusinessRules_Click(object sender, System.EventArgs e)
{
System.Windows.Forms.MessageBox.Show("I was clicked");
}

Julian Bucknall [MSFT]9-Sep-03 6:30

Julian Bucknall [MSFT]

9-Sep-03 6:30

Unless I'm missing something, just call PerformClick():

private void button1_Click(object sender, System.EventArgs e) {
  BusinessRules.PerformClick();
}

Cheers, Julian
Program Manager, C#

This posting is provided "AS IS" with no warranties, and confers no rights.

Re: Using postmessage to interoperate?

mcgahanfl9-Sep-03 6:58

Setting focus on a control?

9-Sep-03 6:58

Thank you.

The PerformClick is akin to SendMessage(). It takes place immediately.
I was hoping for a PostMessage()type behavior.

Any ideas?

thanks

mcgahanfl9-Sep-03 3:51

9-Sep-03 3:51

I would like to set focus on the 1st control that does not have data.
For most controls I can ask in the text field is empty. But for checkboxes and radio buttons, I must ask for the special case of 'GetChecked'. If it was only these two types of controls the code below would be OK. But controls derived from Checkbox and Radio button would also need special case code.

How can I ask if a control is a checkbox or derived from a check box?

public void SetFocusOnFirstEmptyControl()
{
int iCount=0;
System.Windows.Forms.Control Traverse = this;
//System.Reflection
while(Traverse != null)
{
Debug.WriteLine(++iCount + " " + Traverse.Text );
if(Traverse.GetType() == typeof(System.Windows.Forms.CheckBox))
{//do special case handling for check box
System.Windows.Forms.CheckBox pCheck = Traverse;
if(pCheck.Checked()== false)
{
Traverse.Focus();
break;
}
}
if(Traverse.Text.Length == 0)
{//test controls like textbox and dropdown
Traverse.Focus();
break;
}
Traverse = GetNextControl(Traverse, true);

}//while

Roll eyes | :rolleyes:

MeisterBiber9-Sep-03 4:12

MeisterBiber

9-Sep-03 4:12

hi !

>How can I ask if a control is a checkbox or derived from a check box?

DERIVED FROM A CHECKBOX:
myControl.GetType().IsSubclassOf(typeof(CheckBox))

andi

mcgahanfl9-Sep-03 4:55

9-Sep-03 4:55

You rule! Thanks

Mazdak9-Sep-03 5:16

9-Sep-03 5:16

Does this work if that class does not derive directly from CheckBox and CheckBox being its grand parent?

Mazy

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MeisterBiber9-Sep-03 5:41

MeisterBiber

9-Sep-03 5:41

yes.

to check wheter it is derived directly use:

myChild.GetType().BaseType.Equals(typeof(myFatherClass))

andi

Mazdak9-Sep-03 6:02