C / C++ / MFC

Re: How to send a msg between MainFrame and a view?

5-Jan-10 5:57

I would like to do something on a view based on right and left clicks on the status bar of CMainFrame. I was able to do it succesfully using SendMessage command in Pretranslate function, but I noticed that it was breaking standard windows shortcuts like CTRL +F4 and others... Is there a better way of sendng these messages without overriding :::PreTranslate function ?

Thanks

Richard MacCutchan5-Jan-10 9:31

Re: How to send a msg between MainFrame and a view?

5-Jan-10 9:31

I'm not sure why you need to override PreTranslate(). Why not just add the SendMessage() or PostMessage() in the code that handles the mouse clicks? Also if you have message conflicts then use one of the values reserved for applications - WM_USER + x.

Software20075-Jan-10 9:51

Re: How to send a msg between MainFrame and a view?

5-Jan-10 9:51

great, but why can't I seem to do the left and right click handlers in MainFrame ? It doesn't even hit those handler functions when Left and right clicked. I do have ON_WM_LBUTTONDOWN() defined for example in the Message map as well.

Any ideas what I could be missing there?

Richard MacCutchan5-Jan-10 9:59

Re: How to send a msg between MainFrame and a view?

5-Jan-10 9:59

Well this is a totally different issue; your original question suggested that you were capturing the mouse clicks. The comments above imply this is MFC, which is something I haven't used for many years, so I'm afraid I cannot offer much more, apart from suggesting you check all the alternative events that MFC will send to you.

Software20075-Jan-10 10:02

Re: How to send a msg between MainFrame and a view?

5-Jan-10 10:02

Thanks, yes it is MFC. Yes, I was able to capture clicks within the PreTranslate function, but OnLButtonDown(UINT nFlags,CPoint point); is whats not working, it isn't even going there.

Richard MacCutchan5-Jan-10 10:50

Re: How to send a msg between MainFrame and a view?

5-Jan-10 10:50

Are you sure your PreTranslate() function is returning the correct value so the messages still get dispatched? If you tell the framework that you have already handled the message then they will never get to the relevant event handler elsewhere.

Software20076-Jan-10 2:30

Re: How to send a msg between MainFrame and a view?

6-Jan-10 2:30

The following code works, but breaks some of the standard Windows shortcuts for some reason. How do I just implement ONLeftMouse and OnRightMouse handlers to do the equivalent? I tried doing void CMainFrame::OnLButtonDown(UINT Flags,CPoint point) & void CMainFrame::OnRButtonDown(UINT Flags,CPoint point), but It isn't going there. Any ideas?

BOOL CMainFrame::PreTranslateMessage(MSG* pMsg)
{


  	 POSITION FirstDoc =theApp.m_pMainDocTemplate->GetFirstDocPosition();
	 if(FirstDoc !=NULL){
		CMYAppDoc* pDoc = (CMYAppDoc*)theApp.m_pMainDocTemplate->GetNextDoc(FirstDoc);

		if(pDoc != NULL){

			POSITION pos =  pDoc->GetFirstViewPosition();
			while (pos != NULL){
				CView* pActiveView =  pDoc->GetNextView(pos);
				

			//Get All the Consoles and Static Graphs
			   if(pActiveView->IsKindOf( RUNTIME_CLASS(CRealView)) ){
				    CRealView *pView = (CRealView*)pActiveView;
				       if (pMsg->message == WM_LBUTTONDOWN)      //Left Click                              
					       pView->SendMessage(WM_LBUTTONDOWN,(WPARAM)0, (LPARAM)0);    //Send Left Click Message to CRealView

				       else if (pMsg->message == WM_RBUTTONDOWN) //Right Click
					       pView->SendMessage(WM_RBUTTONDOWN,(WPARAM)0,(LPARAM)0);    //Send Right Click Message to CRealView		
				
				}

			}//end while
		}//end doc ! NULL

	 }

  

    return CFrameWnd::PreTranslateMessage(pMsg);

}

Richard MacCutchan6-Jan-10 3:48

Re-drawing Transparent Bitmap - Strange Behavior

6-Jan-10 3:48

As I said earlier I haven't used MFC for a long time, and I have to admit I am not a great fan. However looking at the above code I am not sure that you should be calling SendMessage() within the PreTranslateMessage() function, as this tries to process the message in the relevant Window before returning. Maybe PostMessage would work as it merely puts the message into the queue for the specified Window. However, I am speculating here as I am not sure how the MFC framework treats this situation.

softwaremonkey5-Jan-10 5:05

Re: Re-drawing Transparent Bitmap - Strange Behavior

5-Jan-10 5:05

Hi,

With much appreciated help from this forum I have finally managed to display a 32 bit bitmap with graded transparency (using the alpha channel).

However, I have noticed that if the bitmap is re-drawn in the same location, the semi-transparent pixels become solid and so the image reverts to having a ragged edge.

Is this normal behavior or have I got a setting wrong? Confused | :confused:

Thanks

Tony

Cedric Moonen5-Jan-10 8:28

Cedric Moonen

5-Jan-10 8:28

Are you clearing the background before redrawing the bitmap ?

Cédric Moonen
Software developer

Charting control [v3.0 - Updated]
OpenGL game tutorial in C++

Re: Re-drawing Transparent Bitmap - Strange Behavior

softwaremonkey5-Jan-10 8:42

Re: Re-drawing Transparent Bitmap - Strange Behavior

5-Jan-10 8:42

Hi Cedric

Nope I am not and as you are suggesting, if I do this it works. The question then is how to clear the background?

The object containing the transparent bitmap only has access to a DC and not to a window so I cant easily use InvalidateRect().

Perhaps there is another way to clear the backgound. I even thought of copying the background into another bitmap and BitBlt it before drawing the transparent bitmap each time the object is repainted but is this getting a bit complicated?

Perhaps there is an easier way? Unsure | :~

Tony

Cedric Moonen5-Jan-10 9:14

Cedric Moonen

5-Jan-10 9:14

On which "surface" are you drawing your bitmap ?

Cédric Moonen
Software developer

Charting control [v3.0 - Updated]
OpenGL game tutorial in C++

Re: Re-drawing Transparent Bitmap - Strange Behavior

softwaremonkey5-Jan-10 9:31

Re: Re-drawing Transparent Bitmap - Strange Behavior

5-Jan-10 9:31

Hi,

I have a window derrived from CWnd and the client area consist of a background bitmap with lots of animated bitmaps overlaid drawn in the Window's DC, mostly in response to WM_PAINT messages.

The background bitmap is redrawn in OnEraseBkgnd() and the OnPaint() handler creates a DC and tells all of the bitmaps to draw themselves.

Does that answer your question?

Thanks for your interest Thumbs Up | :thumbsup:

Tony

Rozis6-Jan-10 10:15

Rozis

6-Jan-10 10:15

softwaremonkey wrote:
I even thought of copying the background into another bitmap and BitBlt it before drawing the transparent bitmap each time the object is repainted but is this getting a bit complicated

That's the right thing to do, because it will always deliver a correct result even if your background has a bitmap on it or is gradiented, and it is just a few lines of code more...

Note: I think you could use InvalidateRect() when could be garanteed that the window was repainted before you draw your bitmap on it. Maybe WaitForInputIdle() can help you with that. [modified] Why doing so difficult: if your background is a solid color why not paint it yourself?

Rozis

Re: Re-drawing Transparent Bitmap - Strange Behavior

softwaremonkey6-Jan-10 11:39