Another custom control question

[LarryMc]

I have a custom control that has a button in it and I want to change the look based upon a left mouse up/down.

I know I trap WM_LBUTTONDOWN and WM_LBUTTONUP inside my control.

Question is how to pass the button press properly to the parent window handler?

Do I use this sort of code inside the case of the control and return 0

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   NMHDR nmhdr
   nmhdr.hwndFrom = hWnd
   nmhdr.idFrom   = GetDlgCtrlID(hWnd)
   nmhdr.code     = code
  return(SendMessage(GetParent(hWnd), WM_NOTIFY, nmhdr.idFrom, &nmhdr))
or do I set up message,lparam,and hparam, and let it fall thru to the

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return(DefWindowProc(hWnd, uMsg, wParam, lParam))

Larry

[Ionic Wind Support Team]

Left mouse up/down on the button, or in the control.  Assuming there is more than the button there.

If on the button then you will need to subclass the button itself.  And pass the messages back to the replaced handler.

Paul.

[LarryMc]

My button in my control is going to be a custom looking, draw my on buttton.

I guess the best way for me to ask my question is this way.

I want to create my own custom type of button with it's own class name.
Therefore I want to pass the button presses to the parent window.

I've done the capturing the button presses in a custom control before by using regions but I've never tried to send the press to the parent for use in response to my control.

Larry

[Ionic Wind Support Team]

If you just want to send a button press then it would be:

SendMessage( hwnd, WM_COMMAND, button_id, button_handle)

Emergence windows also respond to:

SendMessage( hwnd, @IDCONTROL, button_id, button_handle)

hwnd = the handle to the parent window
WM_COMMAND = 0x111

Buttons don't use NMHDR's.  If there is a custom notification code you OR it in with the wParam shifted left 16 bits.

SendMessage( hwnd, WM_COMMAND, button_id | (notify_code << 16) , button_handle)

Paul.

[LarryMc]

That's exactly what I needed to know.

Thanks for taking the time at this late hour.

Larry

[LarryMc]

Inside a custom control I can use GetParent(hwnd).

This gives me the handle for the controls parent.

How can I determine if the parent is a window or a dialog from inside the custom control?

Larry

[Ionic Wind Support Team]

Why do you need to know? 

[LarryMc]

I need to know the background color of the parent to fill some color in on my custom control.
I'm drawing a rectangle and then "removing" part of it.

When I do this on a dialog I don't get the dialog color.

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pbkcolor=GetBkColor(GetDC(GetParent(hWnd)))
I get a color that is lighter than the dialog color.

If I use

Code Select Expand

pbkcolor=getsyscolor(COLOR_MENU)then it looks right.
So I need to know when to use the latter.
And I would know that if I knew whether or not the parent is a dialog.

Larry

[Ionic Wind Support Team]

Larry,
Probably because the background color has nothing to do with the client color of a dialog, or window for that matter.  It is used by Windows DC when filling in the solid portions of fonts, rectangles, etc.

The correct way to do what you want, would probably be a little more code that you think.  As you have to get the parent DC and bitblt the rectangle you want into your controls DC, converting the coordinates of the rectangle from the parent window, to screen coordinates, to your client coordinates.

Lets see...

I've only done this for non-autodrawn custom controls, in the @IDPAINT handler.

GetSize control_win,_x,_y,_w,_h
pt.x = _x
pt.y = _y
ScreenToClient(parent_hwnd,pt)
UINT hDC:_hDC = GetHDC(control_win)
UINT parenthDC:_parentHDC = GetDC(parent_hwnd)
BitBlt(hDC,0,0,_w,_h,_parentDC,pt.x,pt.y,SRCCOPY)
...release the DC's

Then draw your control on top of that. 

Probably best to invalidate the rect your grabbing from the parent, so it redraws before you grab the bits from the rectangle.

This way if the background of the parent is not a solid color, like it has some bitmap under your control, or the user is using themes or Vista, then the transparent effect looks correct.

Paul.

[LarryMc]

Thanks,
I would have never figured that out.

Larry

[LarryMc]

Still haven't gotten it to work

Have this in my WM_CREATE section for my custom control  that is a child of a dialog and is working fine except I can't get the color of the pixel located on the parent before I initially draw my control.

Code Select Expand

GetWindowRect(hwnd,rc)
l = rc.left
t = rc.top
w = rc.right - rc.left
h = rc.bottom - rc.top
pt.x = l
pt.y = t
phwnd=getparent(hwnd)
ScreenToClient(phwnd,pt)
hdc2 = GetDC(hwnd)
phDC=GetDC(phwnd)
BitBlt(hdc2,0,0,w,h,phdc,pt.x,pt.y,SRCCOPY)
#g_dat.parent_bk_color =_GetPixel(hdc2,2,2)
print #g_dat.parent_bk_color                         /*4294967295  */

unRgb(#g_dat.parent_bk_color>>8,r,g,b)
print r,g,b                                                     /*  255,255,255  */
releasedc(GetParent(hWnd),phDC)
releasedc(hWnd,hDC2)
I guess I'm in over my head again.

Larry

[Ionic Wind Support Team]

Like I had mentioned you need to do that in @IDPAINT.  WM_CREATE is sent before your window has been shown, and it is not totally initialized at that point.  Things like BitBlt most likely won't work.

Paul.

[LarryMc]

Sorry about that.

Thanks

Larry

[LarryMc]

Worked like a champ.

Thanks again

Larry

[Ionic Wind Support Team]

Thats good...considering I typed it from memory

[LarryMc]

Instead of creating another custom control question I'll just tack my new question on to this one.

When I create my custom control I'm using _GetWindowLong(hWnd, GWL_USERDATA) to store information about that instance of the control.
In    select uMsg
      case WM_CREATE
I allocate the memory for the UDT whose pointer is stored in  GWL_USERDATA.
The scheme has worked great for me.

What I want to know is would I be asking too much to open a file and retrieve information to store in my UDT for that given instance. I would be doing it during WM_Create.
Right now I'm having to hardcode an awful lot of information in my .lib source.
Seems like if I could do the file thing that it would allow me to add additional variations of my custom control just by updating an external data file.

Larry

[Ionic Wind Support Team]

I don't see any problem with it.

Paul.

[LarryMc]

Thanks

Larry