[lazarus] dialogs 0.2

[Shane Miller]

Sergio, I like what you did with the dialgs.pp file.  but...I had to change
it a bit.  If I tried to run it the way you said it would crash when it
looked at FFilename, possibly because the pchar wasn't already created and
had no memory associated with it, so I made it a string, adjusted the
set_file_selection and set_file_selection procedures and it worked
wonderfully....better than my solution.  I will send the forms.pp and
editor.pp to cliff to include into the CVS if I can't get it to update from
here...


Shane

-----Original Message-----
From: Sergio A. Kessler <sak at perio.unlp.edu.ar>
To: Lazarus mailing list <lazarus at miraclec.com>
Date: Wednesday, May 19, 1999 3:32 PM
Subject: [lazarus] dialogs 0.2


>
>Oh, man, this is working really nice, even if the stupid user
>close the window.
>
>test with:
>
>Procedure TEditor.LoadFile;
>begin
>     Writeln('--> Enterring TEditor.Loadfile (should be
dFromFile( 
>fname))');
>     OpenFileDialog1 := TOpenFileDialog.Create(Self);
>     OpenFileDialog1.Title := 'Select a file';
>     OpenFileDialog1.Filter := '*.pp';
>     if OpenFileDialog1.Execute then
>     begin
>          Writeln('--> in OpenFileDialog1.Execute');
>     end;
>     Writeln('--> out of OpenFileDialog1.Execute');
>     OpenFileDialog1.Free;
>End;
>
>
>
>attached (really this time) and pasted here:
>
>//==================================================================
>//
>//     Dialogs Unit
>//
>//     Contains : TOpenFileDialog
>//
>//
>//     Authors: Sergio A. Kessler, ...
>//
>//
>//     Licensee: in consideration.
>//
>//     Version: 0.2
>//
>//==================================================================
>
>
>unit dialogs;
>
>{$mode objfpc}
>
>interface
>
>uses
>    gtk, classes, Controls, vclGlobals;
>
>
>type
> TCustomDialog = class(TWinControl)
> private
> FUserChoice: integer;
> FFileName : PChar;
> FTitle: PChar;
> FFilter: PChar;
>         function gtk_Ok( widget: PGtkWidget) : Boolean; cdecl;
> function gtk
_Cancel( widget: PGtkWidget) : Boolean; cdecl;
> function gtk_Close( widget: PGtkWidget) : Boolean; cdecl;
> protected
> public
> constructor Create(AOwner : TComponent); override;
> destructor destroy; override;
> property FileName : PChar read FFileName write FFileName;
> property Title : PChar read FTitle write FTitle;
> property Filter : PChar read FFilter write FFilter;
> end;
>
> TOpenFileDialog  = class(TCustomDialog)
> private
> procedure gtk_create;
> procedure gtk_destroy;
> public
> constructor Create (AOwner : TComponent); override;
> destructor destroy; override;
>
> Function Execute : boolean;
> end;
>
>
>Implementation
>
>//-------------------------------------------------------------------------
-
>--
>
>function TCustomDialog.gtk_Ok( widget: PGtkWidget) : Boolean; cdecl;
>begin
>     writeln('--> in gtk_ok');
>     FUserChoice := 1;
>end;
>
>//-------------------------------------------------------------------------
-
>--
>
>function TCustomDialog.gtk_Cancel( widget: PGtkWidget) : Boolean; cdecl;
>begin
>     writeln('--> in gtk_cancel');
>     FUserChoice := 2;
>end;
>
>//-------------------------------------------------------------------------
-
>--
>
>function TCustomDialog.gtk_Close( widget: PGtkWidget) : Boolean; cdecl;
>begin
>     writeln('--> in gtk_close');
>     FUserChoice := 3;
>end;
>
>//-------------------------------------------------------------------------
-
>--
>
>constructor TCustomDialog.Create (AOwner : TComponent);
>begin
>     // the TCustomDialog should not create the file_selection
>     inherited Create(AOwner);
>End;
>
>//-------------------------------------------------------------------------
-
>--
>
>destructor TCustomDialog.destroy;
>begin
>     inherited Destroy;
>End;
>
>//-------------------------------------------------------------------------
-
>--
>
>
>constructor TOpenFileDialog.Create (AOwner : TComponent);
>begin
>     inherited Create(AOwner);
>     gtk_create;
>end;
>
>//-------------------------------------------------------------------------
-
>--
>
>destructor TOpenFileDialog.destroy;
>begin
>     gtk_destroy;
>     inherited Destroy;
>end;
>
>//-------------------------------------------------------------------------
-
>--
>
>Function TOpenFileDialog.Execute : boolean;
>begin
>     if not (GTK_IS_FILE_SELECTION( FComponent)) then gtk_create;
>
>     if FTitle <> '' then
>     begin
>        gtk_window_set_title( @((PGtkFileSelection( FComponent))^.Window),
>                              FTitle);
>     end;
>
>     if FFileName <> '' then
>     begin
>        gtk_file_selection_set_filename( PGtkFileSelection( FComponent),
>                                         FFileName);
>     end;
>
>     if FFilter <> '' then
>     begin
>        gtk_file_selection_complete( PGtkFileSelection( FComponent),
>                                     FFilter);
>     end;
>
>     FUserChoice := 0;
>     writeln('--> about to file_sel_show');
>     gtk_widget_show( FComponent);
>     repeat
>          gtk_main_iteration;
>     until FUserChoice <> 0;
>
>     writeln('--> about to file_sel_hide');
>     if (FUserChoice <> 3) then gtk_widget_hide( FComponent);
>
>     Execute := (FUserChoice = 1);
>     if Execute then
>     begin
>          FFileName :=
file_selection_get_filename( PGtkFileSelection( 
>FComponent));
>     end;
>end;
>
>
>Procedure TOpenFileDialog.gtk_create;
>begin
>     FComponent := gtk_file_selection_new( FTitle);
>     
>     gtk_window_set_modal( @((PGtkFileSelection( FComponent))^.Window), 
>True);
>
>     gtk_signal_connect_object( gtk_object( 
>(PGtkFileSelection(FComponent))^.ok_button),
>                                'clicked',
>                                gtk_signal_func( @gtk_ok),
>                                gtk_object( self));
>                                       
>     gtk_signal_connect_object( gtk_object( 
>(PGtkFileSelection(FComponent))^.cancel_button),
>                           
     'clicked',
>                                gtk_signal_func( @gtk_cancel),
>                                gtk_object( self));
>
>     gtk_signal_connect_object( gtk_object( FComponent),
>                                'destroy',
>                                gtk_signal_func( @gtk_close),
>                                gtk_object( self));
>end;
>
>
>Procedure TOpenFileDialog.gtk_destroy;
>begin
>     if (GTK_IS_FILE_SELECTION( FComponent)) then
>     begin
>         writeln('--> destroying file_selection');
>
signal_handlers_destroy( gtk_object( 
>(PGtkFileSelection(FComponent))^.ok_button));
>         gtk_signal_handlers_destroy( gtk_object( 
>(PGtkFileSelection(FComponent))^.cancel_button));
>         gtk_signal_handlers_destroy( gtk_object( FComponent));
>         gtk_widget_destroy( PGtkWidget( FComponent));
>     end;
>end;
>
>end.
>