Re: List Control : Can't change focus w/ tab key - C / C++ / MFC Discussion Boards

Ryan Binns9-Sep-04 18:46

9-Sep-04 18:46

Sounds interesting. The child controls would need to be either rewritten or subclasses to use the new DC as the WM_PAINT message doesn't include a DC. Other than that, I think it has potential. I guess you'd BitBlt() the memory DC to the screen when the parent processes the WM_PAINT message as the children are always drawn first.

Ryan

"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"

Re: Win32 control compositing

Jim Crafton10-Sep-04 5:25

Jim Crafton

10-Sep-04 5:25

WM_PAINT message doesn't include a DC

Actually it sort of does. According to MSDN "For some common controls, the default WM_PAINT message processing checks the wParam parameter. If wParam is non-NULL, the control assumes that the value is an HDC and paints using that device context."[^]

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Re: Win32 control compositing

Ryan Binns10-Sep-04 22:29

Ryan Binns

10-Sep-04 22:29

Yeah, I've seen that before too Smile | :)

. And it would be good if it worked, but as it says, some common controls check this parameter, not all. And Windows itself never sets the wParam parameter; the WM_PAINT documentation states that wParam is unused. I've always thought this lack of DC was a very bad oversight.

But still, it could be useful Smile | :)

Ryan

"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"

Re: Win32 control compositing

Blake Miller13-Sep-04 6:32

Blake Miller

13-Sep-04 6:32

You get a WM_PAINT so you call BeginPaint and get a PAINTSTRUCT which has a DC as its first field. This is where the drawing should occur.

Re: Win32 control compositing

Ryan Binns13-Sep-04 20:42

Ryan Binns

13-Sep-04 20:42

Blake Miller wrote:
You get a WM_PAINT so you call BeginPaint and get a PAINTSTRUCT which has a DC as its first field. This is where the drawing should occur.

Yeah, but applications have no control over that. The DC is defined by Windows, and is not given in the WM_PAINT message.

Ryan

"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"

List Control : Can't change focus w/ tab key

Wes Jones9-Sep-04 7:37

Wes Jones

9-Sep-04 7:37

Hi All,

I'm using a CListCtrl in a dialog, and I've noticed that when it has the focus, the tab key will not cause it to change the focus to the next control in the tab order. Does anyone know what's up w/ this?

Note that OnGetDlgCode() is returning DLGC_WANTALLKEYS because I want to capture the Enter key. When I remove DLGC_WANTALLKEYS, the tab key changes the focus like I'm expecting, but it's a problem because I need to capture the Enter key.

How can I have my cake, and eat it too?

Thanks!!!

Re: List Control : Can't change focus w/ tab key

David Crow9-Sep-04 11:02

David Crow

9-Sep-04 11:02

Try to narrow the problem down a bit. Does it happen with all projects or just this one? If the latter, does it happen with all list controls or just one in particular?

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Re: List Control : Can't change focus w/ tab key

Wes Jones9-Sep-04 12:55

Wes Jones

9-Sep-04 12:55

Thanks for the reply! It was happening in every instance where my List Control was using my CListCtrl derived class that returned DLGC_WANTALLKEYS from OnGetDlgCode().

I came up a fix for it tho, which was to manually set the focus to the next window in the z-order (z-order == tab order).

Here's what my fix looked like:

BOOL CListCtrlEx::PreTranslateMessage(MSG* pMsg) 
{
	//
	//  Capture the Key press for the TAB key & manually set the focus to the 
	//  next control
	//
	if( pMsg->message == WM_KEYDOWN	&& pMsg->wParam == VK_TAB )
	{
		CWnd * pNext = GetWindow(GW_HWNDNEXT);
		CWnd * pFirst = pNext ? NULL : ( pNext = GetWindow(GW_HWNDFIRST) );//if there is no 'next' window, start from the first one...
		while(pNext)
		{
			DWORD dwStyle = pNext->GetStyle();
			if( dwStyle & WS_TABSTOP 
			&&  pNext->IsWindowVisible() 
			&&  pNext->IsWindowEnabled() 
			&&  pNext->GetSafeHwnd() != m_hWnd )
			{
				pNext->SetFocus();
				return FALSE;
			}
			pNext = pNext->GetWindow(GW_HWNDNEXT);

			if( pNext == NULL && pFirst == NULL )
			{
				//if we reach this, it means that this ctrl
				//was the last ctrl in the tab order w/ the right style/status, 
				//so start from the first window.
				pNext = pFirst = GetWindow(GW_HWNDFIRST);
			}
		}//end while(pNext)
	}
	
	return CListCtrl::PreTranslateMessage(pMsg);
}

ctabctrl

prateekkathuria9-Sep-04 7:29

prateekkathuria

9-Sep-04 7:29

i want to dynamically create a tabctrl and add tabs dynamically to it. Also teh controls rendered on each tab will be dynamically created. Any suggestion of how it can be achieved.

Re: ctabctrl

prateekkathuria9-Sep-04 9:50

prateekkathuria

9-Sep-04 9:50

i am successfully able to create the tabcontrol using the cdialog extended class as tabs. what is the difference in "can do and cannot do" if a property sheet is used instead? Which of the two is better to use and why?

Displaying a monochrome uchar array - formatting problem?

towd9-Sep-04 5:23

towd

9-Sep-04 5:23

Hi all,

I have a uchar array containing values of either 0 or 255 (ie monochrome) and am trying to BitBlt it into a window using the memory DC buffering to avoid flicker (ie creating a compatible memory DC, selecting a bitmap then BitBlting it to the window DC). The window is of the same size/slightly smaller.

1) I first attempted to use CreateCompatibleBitmap route (which I thought would be simplest?), using SetBitmapBits etc. The result was that the image was displayed twice in the top 2 quarters of the window, with nothing in the bottom half.

2) I also went down the CreateBitmapIndirect route using a BITMAP structure I managed to display only the first part of the array, which stretched to fill the bitmap. It looks like each 8 bit pixel value is being used to fill 8 pixels in the display, but I can't find how to set it to use 8 bits per pixel, without having to create a DIB type structure? (Setting the 255 values to 1 results in the same effect, but where there were 8 white pixels there are now 1 white and 7 black)

I really could do with using the Bit Blt function to run the process as fast as possible - can anyone suggest a solution?

Any help greatly appreciated - thanks!

Re: Displaying a monochrome uchar array - formatting problem?

C^hris L^osinger9-Sep-04 7:22

C^hris L^osinger

9-Sep-04 7:22

what's wrong with just using a monochrome DIB?

set up the BITMAPINFOHEADER and palette, put your pixels into the rows, top-down, with padding on the ends of the rows to ensure that they're a multiple of four bytes wide.

-c

Software | Cleek

Setting EXACT Button Size

_BaRNi_9-Sep-04 4:37

_BaRNi_

9-Sep-04 4:37

I have a control that subclasses CButton and I need it to be _exactly_ 256x256 pixels...
How can I set the exact Size of a control? I've tried editing the .rc, but the measures are given in DLUs...
Thank you people!!

Re: Setting EXACT Button Size

alex.barylski9-Sep-04 5:09

alex.barylski

9-Sep-04 5:09

MoveWindow???

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Re: Setting EXACT Button Size

_BaRNi_9-Sep-04 5:19

_BaRNi_

9-Sep-04 5:19

Thanks for your reply!

I was meaning at design time, not at runtime... I've fixed it temporarily with on-the-fly resizing during initialization... But I'd like to know if there is a standard method...

Re: Setting EXACT Button Size

Maximilien9-Sep-04 6:47

Maximilien

9-Sep-04 6:47

we/you can't really make a button have fixed PIXEL size in the resource editor, the units are DLUs, Dialog Logic Units, and are proportional to some windows dohickey ( big font, small font, ... ).

the only way to do it, is to use MoveWindow in the the dialog initialization, but watch out for big font vs. small font settings.

Maximilien Lincourt
Your Head A Splode - Strong Bad

Re: Setting EXACT Button Size

David Crow9-Sep-04 8:24

David Crow

9-Sep-04 8:24

Don't waste your time. Thinking about pixels at design time is a sure recipe for failure. The whole reason, and beauty, for having DLUs is so that pixels do not matter. Otherwise, the controls will work on one machine and one machine only...yours. On any other machine, the results will be less than desireable. Things like resolution, font size, display driver, etc. will wreak havoc on your application.

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

CInternetFile class to read from the server

Cris9-Sep-04 4:18

Cris

9-Sep-04 4:18

Hi,

I need to read a file from the server, then I will use the CInternetFile class for this (is anyone better ??).

Is need the configure anything in the server (or course, user and password) like samba ??

Thanks,
[]'s Cris

Re: CInternetFile class to read from the server

David Crow9-Sep-04 8:25

David Crow

9-Sep-04 8:25

Cris wrote:
I need to read a file from the server, then I will use the CInternetFile class for this (is anyone better ??).

Are you asking how to read a file from the server, or use the CInternetFile class?

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Adding an ActiveX control in ActiveX control project

Muhammad Azam9-Sep-04 4:10

Muhammad Azam

9-Sep-04 4:10

hi I am developing an ActiveX control in which i have placed a dialog box and and on that dialog box there are some controls like button control,edit control etc (its working fine). But when i add registered controls like flex grid control (from project>Add to project...>components and controls ...) on the dialog, the dialog box's m_hWnd member becomes NULL.

Does any one know how to solve this problem.its urgent please.

regards
Azam

Re: Adding an ActiveX control in ActiveX control project

jmkhael9-Sep-04 4:35

jmkhael

9-Sep-04 4:35

Call AfxEnableControlContainer in InitInstance

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

Re: Adding an ActiveX control in ActiveX control project

Muhammad Azam9-Sep-04 19:25

Muhammad Azam

9-Sep-04 19:25

thanks sir
Your reply has give my thought a new direction thank you very much;

could you plz send me a sample program that will help me a lot.

regards
Azam

inheritance,searching and recursion

Member 13550639-Sep-04 3:48

Member 1355063

9-Sep-04 3:48

A class that forma part of a larger software component implements the bubble sort and sequential search on ana array of type double.The client wishes to replace the bubble sort by the Quicksort and the sequential search by the binary search.Both the quicksort and binary search are to be implemented recursively.Use inheritance to implement the two classes and demonstrate the use of polymorphism

Re: inheritance,searching and recursion

David Crow9-Sep-04 8:29

David Crow

9-Sep-04 8:29

Can we first have the name of your instructor to see if it is permissible for others to do your homework? I'm sure asking for help on specific aspects of the problem is ok (only after you've tried and failed, though), but to just outright ask others to do your homework is an absolute no-no. Good luck!

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Dinamic Menus

ivax9-Sep-04 2:33

ivax

9-Sep-04 2:33

I need your help!!!!

I need to do a Dinamic menu during execution. The question is that I have a Menu, in this menu is a Submenu. OK, I need insert option in this Submenu and when click in one option execute a diferent functions.

How can I do it?

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.