Problem reserving accelerator keys

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   I try to override the OnPreviewEditKey method from the shortcut manager to prevent the user fomr using some accelerators that conflicts with our built-in ones. Here it is the "Home" Key.
When the method is first called ( from the WM_KEYDOWN ), I receive the ACCEL struct with a fVirtKey, meaning that the key pressed is a virtual key-code. I return false if the key is VK_HOME. It works fine so far.

The problem is that the method is called a second time ( for the WM_KEYUP ) and this time, the fVirtKey is not set to TRUE. Therefore I cannot say that the key depressed is "HOME", since the non virtual key code equivalent to "Home" is "$", and I don't want to forbid that key.

The problem is the following, when the "HOME" key is depressed, the Preview Key mecanism thinks the user just depressed "$" and sets the EditBoxText to "$". 

The problem happens to the VK_ESCAPE key you are blocking. But you don't see the bug since the non-virtual equivalent to "Escape" is not a displayable character.

Thanks
Jansim

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jansim Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 03 November 2005 Location: Canada Status: Offline Points: 20	Post Options Post Reply Quote jansim Report Post Thanks(0) Quote Reply Topic: Problem reserving accelerator keys Posted: 16 October 2006 at 4:47pm
	I try to override the OnPreviewEditKey method from the shortcut manager to prevent the user fomr using some accelerators that conflicts with our built-in ones. Here it is the "Home" Key. When the method is first called ( from the WM_KEYDOWN ), I receive the ACCEL struct with a fVirtKey, meaning that the key pressed is a virtual key-code. I return false if the key is VK_HOME. It works fine so far. The problem is that the method is called a second time ( for the WM_KEYUP ) and this time, the fVirtKey is not set to TRUE. Therefore I cannot say that the key depressed is "HOME", since the non virtual key code equivalent to "Home" is "$", and I don't want to forbid that key. The problem is the following, when the "HOME" key is depressed, the Preview Key mecanism thinks the user just depressed "$" and sets the EditBoxText to "$". The problem happens to the VK_ESCAPE key you are blocking. But you don't see the bug since the non-virtual equivalent to "Escape" is not a displayable character. Thanks Jansim

Oleg Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 21 May 2003 Location: United States Status: Offline Points: 11234	Post Options Post Reply Quote Oleg Report Post Thanks(0) Quote Reply Posted: 18 October 2006 at 1:00am
	Hello, you right. Please modify sources: if (pMsg->wParam == VK_SHIFT \|\| pMsg->wParam == VK_CONTROL \|\| pMsg->wParam == VK_MENU ) { // all work is already done }else if (bPressed) { m_hAccel.key = (WORD) pMsg->wParam; m_bKeyDefined = TRUE; SetAccelFlag (FVIRTKEY, TRUE); }
	Oleg, Support Team CODEJOCK SOFTWARE SOLUTIONS

jansim Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 03 November 2005 Location: Canada Status: Offline Points: 20	Post Options Post Reply Quote jansim Report Post Thanks(0) Quote Reply Posted: 18 October 2006 at 9:52am
	Thank you