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Home > Forums > Programmers > Development Tools > Embarcadero: C++Builder Forum

How can I tell if Shift is being held down in a doubleclick handlerHelpful Member! 

thread101-1677887
Read More Threads Like This One
astrohart (TechnicalUser)
14 Mar 12 19:19
I am using Borland C++ Builder 5 on WinXP.

I am detecting whether the user double-clicks in a grid cell on my form and i have handled the appropriate double-click event.

Now i have to make sure and only respond if the user double-clicks whilst holding down the 'shift' key.  How would this be done?

Thanks for any insights.
Helpful Member!  Prattaratt (TechnicalUser)
14 Mar 12 20:22
In your TMouseEvent variable type there is a shiftstate field;  it determines if the shift, ctrl and or alt keys are pressed at the time of the event. What I suggest is you trap the mousedown event; if the shift key is pressed, then set a private class boolean variable to true and to false if the shift key is not pressed. Then check that variable's state in your doubleclick handler.

CODE

-----------------------.h file ----------------------------------
class TForm1 : public TForm
{
__published:    // IDE-managed Components
  void __fastcall FormMouseDown(TObject *Sender, TMouseButton Button,
          TShiftState Shift, int X, int Y);
private:    // User declarations
  boolean ShiftKeyPressed;
public:        // User declarations
  __fastcall TForm1(TComponent* Owner);
};
-----------------------.cpp file --------------------------------
void __fastcall TForm1::FormMouseDown(TObject *Sender, TMouseButton Button,
      TShiftState Shift, int X, int Y)
{
  if (Shift && ssShift)
    ShiftKeyPressed = true;
  else
    ShiftKeyPressed = false;
}
 
Prattaratt (TechnicalUser)
14 Mar 12 20:27
Correction to my previous code; the if statement should read:

CODE

  if (Shift.Contains(ssShift))
astrohart (TechnicalUser)
15 Mar 12 19:12
Thank you, the tip worked and was very helpful.
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