Shift + VK_LEFT

_Flaviu

Is there any possibility to catch shift + left key without mess up PreTranslateMessage ? I have tried this:

void CGridCtrlExt::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags)
{
// TODO: Add your message handler code here and/or call default

if(VK\_LEFT == nChar || VK\_RIGHT == nChar)
	TRACE1(">>>%d", nChar);

CGridCtrl::OnKeyDown(nChar, nRepCnt, nFlags);

}

I see TRACE message ... but when I wrote:

void CGridCtrlExt::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags)
{
// TODO: Add your message handler code here and/or call default

if((VK\_LEFT == nChar || VK\_RIGHT == nChar) && GetKeyState(VK\_SHIFT) < 0)
	TRACE1(">>>%d", nChar);

CGridCtrl::OnKeyDown(nChar, nRepCnt, nFlags);

}

I saw nothing ... can you help me out, please ? Thank you.

Jochen Arndt

It should work that way. But it will not work if those key combinations are "eaten" by an existing pre-translation. You may test that by using the first version with an extended trace:

TRACE1(">>>%d, state %x", nChar, GetKeyState(VK_SHIFT));

If the above is not called with shift key down, it is probably "eaten". Then you must use PreTranslateMessage or try to disable the existing translation.

_Flaviu

I was just made the same test:

TRACE("%d|%d\n", IsSHIFTpressed(), nChar);

but no, with shift key pressed, the keydown handler seem not calling ... I have to see what happen above this class. Thank you, and I'll come back with feedback.

Lost User

I have just tried this and it all works as per the documentation. I can only assume that these keys are being trapped by the CGridCtrlExt control somehow.

_Flaviu

Strange ... I have checked if parent of CGridCtrlExt (CGridCtrl), has PreTranslateMessage, but no, has not ... more over, I override CGridCtrlExt::OnChar, CGridCtrlExt::OnSysChar, CGridCtrlExt::OnSysKeyDown, none of them tell me when I press the shift key ... weird ... I don't know where to search the issue ...

Jochen Arndt

I don't know which CGridCtrl you are using. The keys may be also catched by an underlying Windows control so that you don't see the translator source. If there is some action associated, you should recognize it. What happens when pressing Shift Left/Right on a wide item? You may spend some more time for investigation or just implement your own PreTranslateMessage handler.

_Flaviu

Neither CGridCtrlExt has PreTranslateMessage, or something that could trap the shift key ... I can not understand what happen ...

_Flaviu

"I don't know which CGridCtrl you are using" I am using this[^] one.

Lost User

Do you have the source of that class to check? The only real answer is to use your debugger and inspect all the values that are set when the key combination is pressed.

_Flaviu

I guess it is my mistake !!! : I already have an accelerator, shift + left key, on menu item command ... if this is the cause, is there any possibility to know in CGridCtrlExt, of on CDialog which contain this control, to know when I pressed Shift and left key ?

Jochen Arndt

I have not used that so far. But I'm quite sure that the arrow keys are used to select cells when the Shift key is pressed too.

_Flaviu

I think I found the problem: [^].

Jochen Arndt

If you have a global accelerator you have three options:

From the accelerator handling check if your grid control is active and pass the message to that if so
Add another accelerator table to your grid control
Use PreTranslateMessage in your grid control

_Flaviu

I will try your first solution. I'll come back.

_Flaviu

Because left/right key combined with shift/ctrl key are used to mark grid cells, I have chose to use F7/F8 key for my needs. Thank you all of you for patience and attention. Bye.