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program simple_filechooser;
(* basing upon helloworld2 example*)
{$mode objfpc} {$H+}
{$IFDEF GTK2_0}{$FATAL this demo needs gtk 2.4}{$ENDIF}
{$IFDEF GTK2_2}{$FATAL this demo needs gtk 2.4}{$ENDIF}
uses
Glib2, Gdk2, Gtk2;
const
ACTION_OPEN = 1;
ACTION_SAVE = 2;
MAIN_WINDOW_KEY = 'main_window'; { uses with g_object_(get/set)_data as key }
(* File dialog-callback. *)
procedure dialog_callback (widget : PGtkWidget;
data : gpointer); cdecl;
var
dialog : PGtkWidget;
window : PGtkWindow;
action : gint;
filename : Pgchar;
begin
{ Get a pointer to the main window }
window := g_object_get_data (G_OBJECT(widget), MAIN_WINDOW_KEY);
action := gint (data);
case action of
ACTION_OPEN:
begin
dialog := gtk_file_chooser_dialog_new ('Open File',
window,
GTK_FILE_CHOOSER_ACTION_OPEN,
GTK_STOCK_OPEN, [GTK_RESPONSE_ACCEPT,
GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
NULL]);
end; { ACTION_OPEN}
ACTION_SAVE:
begin
dialog := gtk_file_chooser_dialog_new ('Save File',
window,
GTK_FILE_CHOOSER_ACTION_SAVE,
GTK_STOCK_SAVE, [GTK_RESPONSE_ACCEPT,
GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
NULL]);
end; { ACTION_SAVE }
else begin
{ This should never happen }
g_print ('Something is wrong here!!!.'#13#10);
g_print ('No dialog created.'#13#10);
{writeln crashes on my system running linux --- check why }
exit;
end;
end; { case }
if gtk_dialog_run (GTK_DIALOG (dialog)) = GTK_RESPONSE_ACCEPT then
begin
filename := gtk_file_chooser_get_filename (GTK_FILE_CHOOSER (dialog));
g_print ('Filename %s selected.'#13#10, [filename]);
// writeln ('File ', filename, ' selected.');
// ToDO:
// writeln crashes... check why
g_free (filename);
end;
gtk_widget_destroy (dialog);
end;
(* another callback *)
function delete_event (widget: PGtkWidget;
event : PGdkEvent;
data : gpointer): gboolean;cdecl;
begin
gtk_main_quit;
delete_event := FALSE;
end;
var
window,
button,
box1 : PGtkWidget; (* GtkWidget is the storage type for widgets *)
begin
(* This is called in all GTK applications. Arguments are parsed
* from the command line and are returned to the application. *)
gtk_init (@argc, @argv);
(* Create a new window *)
window := gtk_window_new (GTK_WINDOW_TOPLEVEL);
(* This is a new call, which just sets the title of our
* new window to "Hello Buttons!" *)
gtk_window_set_title (GTK_WINDOW (window), 'GtkFileChooser Demo');
(* Here we just set a handler for delete_event that immediately
* exits GTK. *)
g_signal_connect (G_OBJECT (window), 'delete_event',
G_CALLBACK (@delete_event), NULL);
(* Sets the border width of the window. *)
gtk_container_set_border_width (GTK_CONTAINER (window), 10);
(* We create a box to pack widgets into. This is described in detail
* in the "packing" section. The box is not really visible, it
* is just used as a tool to arrange widgets. *)
box1 := gtk_hbox_new (FALSE, 0);
(* Put the box into the main window. *)
gtk_container_add (GTK_CONTAINER (window), box1);
button := gtk_button_new_with_label ('Open');
(* Now when the button is clicked, we call the "callback" function
* with a pointer to the main window as its argument *)
g_object_set_data (G_OBJECT(button), MAIN_WINDOW_KEY, window);
g_signal_connect (G_OBJECT (button), 'clicked',
G_CALLBACK (@dialog_callback), pointer(ACTION_OPEN));
(* Instead of gtk_container_add, we pack this button into the invisible
* box, which has been packed into the window. *)
gtk_box_pack_start (GTK_BOX(box1), button, TRUE, TRUE, 0);
(* Always remember this step, this tells GTK that our preparation for
* this button is complete, and it can now be displayed. *)
gtk_widget_show (button);
(* Do these same steps again to create a second button *)
button := gtk_button_new_with_label ('Save');
g_object_set_data (G_OBJECT(button), MAIN_WINDOW_KEY, window);
g_signal_connect (G_OBJECT (button), 'clicked',
G_CALLBACK (@dialog_callback), pointer(ACTION_SAVE));
gtk_box_pack_start(GTK_BOX (box1), button, TRUE, TRUE, 0);
(* The order in which we show the buttons is not really important, but I
* recommend showing the window last, so it all pops up at once. *)
gtk_widget_show (button);
gtk_widget_show (box1);
gtk_widget_show (window);
(* Rest in gtk_main and wait for the fun to begin! *)
gtk_main ();
end.
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