I am trying to check a shift state in an onMouseUp event

if shift=ssShift then

but when I compile this I get an error

E:\DataRoot\Projects\DelphiConversions\Mathparsers\LXExpParser\Source\lxmathstringgrid.pas(132,11) Error: Incompatible types: got "TShiftStateEnum" expected "TShiftState"

When I look in classesh.inc (where it is defined) there is a strange definition

{$packset 1}
  TShiftState = set of TShiftStateEnum;
{$packset default}

How do I check my shift state and get around this compiler error?

Regards

Alex du Plessis

Hi

Because shift is of type set (not an integer or some other variable type) you cannot test for equality as you would for integer variables with the algebraic "=" sign. The syntax needed is:

if (ssShift in shift) then .

Howard

Alex du Plessis wrote

I am trying to check a shift state in an onMouseUp event if shift=ssShift then

if you want to check if shift is pressed then

[code]
if ssShift in shift then
[/code]

or

[code]
if [ssShift] * shift [] then
[/code]

if you want to check if only shift modifier is pressed and no other modifiers are pressed (ctrl, alt, mouse buttons) then

[code]
if shift = [ssShift] then
[/code]

Best regards,
Paul Ishenin.

Of course, that was completely dumb of me > Why I did not notice that is beyond me.

My apologies

Alex