On 18/04/12 16:22, Martin wrote:
On 18/04/2012 11:53, Hans-Peter Diettrich wrote:
patspiper schrieb:
No, FormClose() isn't called when modal form is hidden via Hide();
Correct
, so form still exists and it can be called with ShowModal() or
Show() again.
I beg to differ here as Showmodal should not exit unless the modal
form is closed.
A modal form (dialog) can be used to accept multiple user entries
(filename...). Then the form object must stay alife until the
application has read all entries. That's why a modal form only hides
itself on exit.
closed <> destroy
Close() depends on close action, which include free and hide.
Close() on a modal Form in LCL ignores close action and always hides
(by setting ModalResult = mrCancel.
Hide() or Visible:=False does not set ModalResult
In fact if in Delphi you hide a modalform, then ShowModal does not return.
Correct
I don't know, if this is intended or accidental behaviour.
It is intended behaviour. Embarcadero docs clearly state:
"ShowModal does not return until the form closes"
Lazarus docs:
"Show this form as modal - ie control cannot be resumed by another form
until the current form is closed"
While of course you can use this, there is a real danger of such a
modal form become hidden, with no means of ever getting it back or
exiting it.
This is fine especially that the same situation arises when the main
form is hidden -> no means of ever getting it back or exiting it. It is
up to the programmer to decide if he opts to hide it.
Stephano
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