Re: OT- Good article Iain - C / C++ / MFC Discussion Boards

staticv17-Dec-08 0:59

17-Dec-08 0:59

// Verify the left button is down
	if ((nFlags & MK_LBUTTON) && (this == GetCapture()))
	{
		m_SecondPoint = point;				// Save the current cursor position

		if (m_pTempElement)
		{
			// Redraw the old element so it disappears from the view
			m_pTempElement->Draw(&aDC);
			delete m_pTempElement;				// Delete the old element
			m_pTempElement = 0;				// Reset the pointer to 0
		}

		// Create a temporary element of the type and color that
		// is recorded in the document object and draw it
		m_pTempElement = CreateElement();			// Create a new element
		m_pTempElement->Draw(&aDC);					// Draw the element
	}

This is a code of a message handler in a drawing application which now supports drawing lines, rectangles and circles.

We save the first cursor position in the Mouse button down handler

The CreateElement() creates an element (rectangle, circle, line, curve) on the heap and returns a pointer to it.

I don't understand why do we need to redraw the old element. Like I created an element and then a mouse move occurs then why do we draw it two times? First, in the inner if block and second, after the if block.

It is drawing over the previously drawn element in the inner if block right?

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Re: Redrawing..

CPallini17-Dec-08 1:44

CPallini

17-Dec-08 1:44

Please elaborate.
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

Re: Redrawing..

L. Madhavan17-Dec-08 2:16

L. Madhavan

17-Dec-08 2:16

Looks like the Draw method is using an XOR pen, which is a common method for drawing shapes. An XOR operation is similar to inverting the colours, so by drawing it the second time, you effectively erase the old shape before drawing the shape at the new position.

Displaying painted areas on Property Sheet

koumodaki17-Dec-08 0:19

koumodaki

17-Dec-08 0:19

I have a property page with a static control area defined as

CONTROL "",IDC_TEMP_GRPH,"Static",SS_GRAYFRAME,154,44,135,129

I am handling WM_PAINT message and the following piece of code gets executed:

CDC* pDC = new CDC(GetDC(this->m_hWnd));
HWND hStatic = GetDlgItem(m_hWnd,IDC_TEMP_GRPH);
RECT pirect;
GetClientRect(hStatic,&pirect);
COLORREF bkColor; bkColor = RGB(225,0,0);
HBRUSH hBrush = ::CreateSolidBrush(bkColor);
::FillRect(GetDC(hStatic),&pirect,hBrush);

The problem is I am not able to see this solid color block. It appears blinking while I drag the Property Sheet but disappears when I switch to next page and switch back to that page. Can anyone please tell me what is missing here?

Re: Displaying painted areas on Property Sheet

Iain Clarke, Warrior Programmer17-Dec-08 0:46

Iain Clarke, Warrior Programmer

17-Dec-08 0:46

Rather than painting from your dialog, try over-riding the static control.

Have a look at this article:
http://www.codeproject.com/KB/miscctrl/generic_picker.aspx[^]

It's not talked about in the article itself, but it uses an owner draw static control to do the pretty picture bit. Feel free to ~~steal~~reuse it from me.

Iain.

OT- Good article Iain

CPallini17-Dec-08 1:36

CPallini

17-Dec-08 1:36

Got my 5, thank you for posting it.
Smile | :)

Re: OT- Good article Iain

Iain Clarke, Warrior Programmer17-Dec-08 2:23

Iain Clarke, Warrior Programmer

17-Dec-08 2:23

Thanks. I've got so much useful code from CP, I like to give back when I can.

I hope you've added yourself to pointy haired thread hijackers list...

Iain.

Re: OT- Good article Iain

CPallini17-Dec-08 2:39

CPallini

17-Dec-08 2:39

Iain Clarke wrote:

I hope you've added yourself to pointy haired thread hijackers list...

Well, since I'm (together with Rajesh) the proud founder of the Brigade, my name is necessarily there.
Smile | :)

Re: Displaying painted areas on Property Sheet

koumodaki17-Dec-08 2:19

koumodaki

17-Dec-08 2:19

Thanks. But I foound out what was missing from my code. I had to add

PAINTSTRUCT ps;
HDC hdc = ::BeginPaint(m_hWnd, &ps);

at the start and

::EndPaint(m_hWnd, &ps);

at end of my code snippet and it works.

Smile | :)

Re: Displaying painted areas on Property Sheet

Code-o-mat17-Dec-08 0:58

Code-o-mat

17-Dec-08 0:58

First, use CPaintDC in the WM_PAINT message handler, not GetDC, and second, when you do this:

GetClientRect(hStatic,&pirect);

You get the client area of the static, not its position in the client area of its parent. If you want to know where the static lies inside of its parent use some coord mapping functions or simply this:

RECT pirect;
GetWindowRect(hStatic,&pirect);
ScreenToClient(&pirect);

> The problem with computers is that they do what you tell them to do and not what you want them to do. <

Re: Displaying painted areas on Property Sheet

koumodaki17-Dec-08 2:21

koumodaki

17-Dec-08 2:21

I am using SDK so CPaintDC is ruled out. So I have to add BeginPaint() and EndPaint() instead fro it to work.

how to change the label of button of Dialog box

vikas choudhry16-Dec-08 23:41

vikas choudhry

16-Dec-08 23:41

Hi,
i want to change the button label (ok,save) of native dialog box.
OPENFILENAME C_FAR *ofn;
fileW = FILEW_Create();
FILEW_Init(fileW);
fileW = FILEW_DefFileW();
ofn = (OPENFILENAME C_FAR *)PTR_New(sizeof(OPENFILENAME));
ofn->lStructSize = sizeof(OPENFILENAME);
ofn->lpstrTitle="Rajib";
ofn->hwndOwner = ((win != (WinPtr)NULL)) ? MSW_WgtGetWWindow((WgtPtr)win) :(HWND)NULL;
ofn->Flags |=OFN_EXPLORER;
GetOpenFileName(ofn);
PostMessage((HWND)fileW,(UINT) CDM_SETCONTROLTEXT,(WPARAM)IDOK,(LPARAM)"hi");

i have used this code and trying to set OK button's label as "Hi" but not being able to do the task.
Can some one help me?

Vikas

Re: how to change the label of button of Dialog box

Jijo.Raj17-Dec-08 0:03

Jijo.Raj

17-Dec-08 0:03

Have a look at this article - Customizing the Windows Common File Open Dialog[^].

Regards,
Jijo.

_____________________________________________________

http://weseetips.com[^] Visual C++ tips and tricks. Updated daily.

Re: how to change the label of button of Dialog box

Code-o-mat17-Dec-08 0:04

Code-o-mat

17-Dec-08 0:04

Use the CFileDialog class and overwrite its OnInitDone() method and use GetDlgItem to find the button (IDOK) and try to change its text.

> The problem with computers is that they do what you tell them to do and not what you want them to do. <

Re: how to change the label of button of Dialog box

Rajib Podder17-Dec-08 22:22

Rajib Podder

17-Dec-08 22:22

Hi Thanks for your suggestion
now my query is if i use GetDlgCtrlID
then kindly suggest me
GetDlgCtrlID(HWND hwndCtl);
what should i pass in hwndCtl(is it dialog box's handle/some thing else).

Regards
Vikas

Re: how to change the label of button of Dialog box

Code-o-mat17-Dec-08 22:41

Code-o-mat

17-Dec-08 22:41

Are you sure you want to use GetDlgCtrlID and not GetDlgItem?

> The problem with computers is that they do what you tell them to do and not what you want them to do. <

Re: how to change the label of button of Dialog box

Rajib Podder18-Dec-08 1:07

Rajib Podder

18-Dec-08 1:07

hi,
MY OBBJECTIVE IS THAT I HAVE A BUTTON IN A WINDOW.
ON CLICK EVENT ON THAT BUTTON I WANT TO SHOW THAT DIALOG FOR WHICH I WANT TO CHANGE THE CAPTION OF BUTTONS(ok,save).
so what procedure should i follow

Re: how to change the label of button of Dialog box

Code-o-mat18-Dec-08 1:44

Code-o-mat

18-Dec-08 1:44

Don't yell. Hmmm | :|

I think the answer has been given to you already, or you mean it doesn't work?

> The problem with computers is that they do what you tell them to do and not what you want them to do. <

Re: how to change the label of button of Dialog box

Rajib Podder18-Dec-08 17:10

Rajib Podder

18-Dec-08 17:10

Hi,
i tried GetDlgCtrlID and GetDlgItem in the init of dialog.
but in both cases it returned id as 0(zero).
For save as dialog box the button label is Save and for open dialog it is Open.
so where should i get the corresponding ids of the same.
i have tried
SendMessage((HWND)fileW,(UINT) CDM_SETCONTROLTEXT,IDOK,(LPARAM)(LPCTSTR)'hi');
to set the OK button's labels as Hi but in case of Open/save dialog there is no button which hold's the label as Ok.
Can you suggest me if i am doing wrong?

Rajib

Re: how to change the label of button of Dialog box

Code-o-mat18-Dec-08 21:30

Code-o-mat

18-Dec-08 21:30

Try using this: CFileDialog::SetControlText[^].

> The problem with computers is that they do what you tell them to do and not what you want them to do. <

Re: how to change the label of button of Dialog box

JudyL_MD17-Dec-08 6:02

JudyL_MD

17-Dec-08 6:02

vikas choudhry wrote:
GetOpenFileName(ofn);
PostMessage((HWND)fileW,(UINT) CDM_SETCONTROLTEXT,(WPARAM)IDOK,(LPARAM)"hi");

Your other responses explain how to do what you want. The reason what you've tried doesn't work is that GetOpenFileName displays a modal dialog. Your PostMessage call doesn't execute until after the Open box has been displayed and closed.

Judy

Be wary of strong drink. It can make you shoot at tax collectors - and miss.
Lazarus Long, "Time Enough For Love" by Robert A. Heinlein

Rahul Vaishnav16-Dec-08 22:51

Rahul Vaishnav

16-Dec-08 22:51

Hi all,

I want to set position of my window on top of Taskbar window also..

I have used

::SetWindowPos(hwnd, HWND_TOPMOST, X, Y, cx, cy, SWP_NOSIZE | SWP_SHOWWINDOW | SWP_DRAWFRAME);

this is working fine in case of XP but in vista my window gets overlapped by the TaskBar.

Note: In both XP & Vista I have enabled "Keep the Taskbar on top of all other windows" property of Taskbar.

I want my window tobe work like Task Manager Window.

Please provide some solution to me.

Thanks in advance.

Jijo.Raj16-Dec-08 23:36

Jijo.Raj

16-Dec-08 23:36

Try disabling "Always on top" feature of taskbar when your application starts and restore it when your application exits. Check this article[^] about how to do it. Open the article and search for "Taskbar always on top". Hope it will help.

Regards,
Jijo.

_____________________________________________________

http://weseetips.com[^] Visual C++ tips and tricks. Updated daily.

Rahul Vaishnav17-Dec-08 0:30

Rahul Vaishnav

17-Dec-08 0:30

Thanks for your reply,

I have tried this

static HWND hShellWnd = ::FindWindow(_T("Shell_TrayWnd"), NULL);
 if(hShellWnd != NULL)
 {
   // Set taskbar always on top off
						::SendMessage(hShellWnd, 0x2b1, 8, 0);
						::SendMessage(hShellWnd, 0x581/*WM_USER+385*/, 1, 0);
						::SendMessage(hShellWnd, 0x550/*WM_USER+336*/, 0, 10001);
						::SendMessage(hShellWnd, 0x579/*WM_USER+377*/, 0, 0);
 }

::SetWindowPos(hwnd, HWND_TOPMOST, X, Y, cx, cy, SWP_NOSIZE|SWP_SHOWWINDOW|SWP_DRAWFRAME);

but it won't work,actually I think that "always on top off" code is not working..

Iain Clarke, Warrior Programmer17-Dec-08 0:54

Iain Clarke, Warrior Programmer

17-Dec-08 0:54

This is a bad idea...

To quote Raymond Chen. "What if another program does this?"

When they close, it will put back the taskbar how it found it, and you'd mysteriously stop working.

Or worse, you'd close first, and mess *their* program up.

Naughty programmer!

Iain.

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