GtkAda Tutorial - SIGAda
GtkAda Tutorial - SIGAda
GtkAda Tutorial - SIGAda
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Arnaud Charlet<br />
charlet@act-europe.fr
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✔ A very simple program<br />
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with Gtk.Main, Gtk.Window;<br />
with Gtk.Main, Gtk.Window;<br />
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procedure Simple is<br />
procedure Simple is<br />
Window : Gtk.Window.Gtk_Window;<br />
Window Gtk.Window.Gtk_Window; &UHDWHD<br />
begin<br />
begin<br />
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Gtk.Main.Init;<br />
Gtk.Main.Init;<br />
Gtk.Window.Gtk_New (Window);<br />
Gtk.Window.Gtk_New (Window);<br />
Gtk.Window.Show (Window);<br />
Gtk.Window.Show (Window);<br />
Gtk.Main.Main;<br />
Gtk.Main.Main;<br />
end Simple;<br />
end Simple;<br />
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– Create a 200x200 pixel window and has no way of<br />
exiting<br />
– Build with gnatmake simple ‘gtkada-config‘
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✔See hello.adb and hello_package<br />
✔Compiling Hello World<br />
– Gnatmake hello ‘gtkada-config‘<br />
• Compiler flags<br />
• Linker flags
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✔<strong>GtkAda</strong>: an event driven toolkit<br />
– Signal: message broadcasted<br />
– Handling via Callbacks or Handlers<br />
• Many handlers per signal<br />
• Handlers are ordered<br />
package Handlers is new Gtk.Handlers.Callback<br />
package Handlers is new Gtk.Handlers.Callback<br />
(Widget_Type => Gtk_Widget_Record);<br />
(Widget_Type => Gtk_Widget_Record);<br />
package Return_Handlers is new Gtk.Handlers.Return_Callback<br />
package Return_Handlers is new Gtk.Handlers.Return_Callback<br />
(Widget_Type => Gtk_Widget_Record,<br />
(Widget_Type => Gtk_Widget_Record,<br />
Return_Type => Boolean);<br />
Return_Type => Boolean);
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procedure Hello_Callback (Widget : access Gtk_Widget_Record’Class);<br />
procedure Hello_Callback (Widget : access Gtk_Widget_Record’Class);<br />
function Delete_Event<br />
function Delete_Event<br />
(Widget : access Gtk_Widget_Record’Class;<br />
(Widget : access Gtk_Widget_Record’Class;<br />
Event : Gdk_Event) return Boolean;<br />
Event : Gdk_Event) return Boolean;<br />
Return_Handlers.Connect<br />
Return_Handlers.Connect<br />
(Window, "delete_event",<br />
(Window, "delete_event",<br />
Return_Handlers.To_Marshaller (Delete_Event’Access));<br />
Return_Handlers.To_Marshaller (Delete_Event’Access));<br />
Handlers.Connect<br />
Handlers.Connect<br />
(Window, "destroy", Handlers.To_Marshaller (Destroy’Access));<br />
(Window, "destroy", Handlers.To_Marshaller (Destroy’Access));
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✔Special kind of signal<br />
✔Correspond to X events<br />
– “button_press_event”<br />
procedure Button_Press_Handler<br />
procedure Button_Press_Handler<br />
(Widget : access Gtk_Widget_Record’Class;<br />
(Widget : access Gtk_Widget_Record’Class;<br />
Event : Gdk.Event.Gdk_Event;<br />
Event : Gdk.Event.Gdk_Event;<br />
User_Data : ...);<br />
User_Data : ...);<br />
Event_Cb.Connect<br />
Event_Cb.Connect<br />
(Button, -- The object to connect to the handler<br />
(Button, -- The object to connect to the handler<br />
"button_press_event", -- The name of the signal<br />
"button_press_event", -- The name of the signal<br />
Event_Cb.To_Marshaller (Button_Press_Handler’Access),<br />
Event_Cb.To_Marshaller (Button_Press_Handler’Access),<br />
-- The signal handler<br />
-- The signal handler<br />
Data => ...);<br />
Data => ...);
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✔ More on Signal Handlers<br />
– Handler type defined<br />
– Connect procedures and functions<br />
• More than one handler may be connected<br />
– Connect_Object also provided<br />
• No User_Data<br />
• Emitting object substituted<br />
✔Emit_By_Name<br />
– Used when creating new widgets
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✔Disconnect<br />
procedure Disconnect<br />
procedure Disconnect<br />
(Object : access Gtk.Object.Gtk_Object_Record’Class;<br />
(Object : access Gtk.Object.Gtk_Object_Record’Class;<br />
Id : in Handler_Id);<br />
Id : in Handler_Id);<br />
Disconnect the handler identified by the given Handler_Id.<br />
Disconnect the handler identified by the given Handler_Id.<br />
✔Emit_Stop_By_Name<br />
procedure Disconnect<br />
procedure Disconnect<br />
(Object : access Gtk.Object.Gtk_Object_Record’Class;<br />
(Object : access Gtk.Object.Gtk_Object_Record’Class;<br />
Id : in Handler_Id);<br />
Id : in Handler_Id);<br />
Disconnect the handler identified by the given Handler_Id.<br />
Disconnect the handler identified by the given Handler_Id.<br />
✔Handler_Block/Unblock/Destroy<br />
procedure Handler_Block<br />
procedure Handler_Block<br />
(Obj : access Gtk.Object.Gtk_Object_Record’Class;<br />
(Obj : access Gtk.Object.Gtk_Object_Record’Class;<br />
Id : in Handler_Id);<br />
Id : in Handler_Id);<br />
Block temporarily the signal. For each call to this procedure,<br />
Block temporarily the signal. For each call to this procedure,<br />
a call to Handler_Unblock is needed to unblock the signal.<br />
a call to Handler_Unblock is needed to unblock the signal.
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✔See hello2.adb and hello2_package<br />
✔Packing widgets
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✔ Theory of packing boxes<br />
– Invisible containers<br />
– Horizontal or Vertical<br />
– Gtk_New_Hbox / Gtk_New_Vbox<br />
✔Details of boxes<br />
– Boxes provide lots of options<br />
– Basically 5 cases
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✔Theory of packing boxes<br />
procedure Pack_Start<br />
procedure Pack_Start<br />
(In_Box : access Gtk_Box_Record;<br />
(In_Box : access Gtk_Box_Record;<br />
Child : access Gtk.Widget.Gtk_Widget_Record’Class;<br />
Child : access Gtk.Widget.Gtk_Widget_Record’Class;<br />
Expand : in Boolean := True;<br />
Expand : in Boolean := True;<br />
Fill : in Boolean := True;<br />
Fill : in Boolean := True;<br />
Padding : in Gint := 0);<br />
Padding : in Gint := 0);
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✔Difference between spacing and padding<br />
– Spacing between objects<br />
– Padding around objects
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✔Container with any number of children<br />
– Each Child is put in a cell<br />
– Cells can have same or different sizes<br />
procedure Gtk_New<br />
procedure Gtk_New<br />
(Table : out Gtk_Table;<br />
(Table : out Gtk_Table;<br />
Rows : in Guint;<br />
Rows : in Guint;<br />
Columns : in Guint;<br />
Columns : in Guint;<br />
Homogeneous : in Boolean);<br />
Homogeneous : in Boolean);<br />
The width allocated to the table is divided into Columns columns,<br />
The width allocated to the table is divided into Columns columns,<br />
which all have the same width if Homogeneous is True.<br />
which all have the same width if Homogeneous is True.<br />
If Homogeneous is False, the width will be calculated with the<br />
If Homogeneous is False, the width will be calculated with the<br />
children contained in the table.<br />
children contained in the table.<br />
Same behavior for the rows.<br />
Same behavior for the rows.
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procedure Attach<br />
procedure Attach<br />
(Table : access Gtk_Table_Record;<br />
(Table : access Gtk_Table_Record;<br />
Child : access Gtk.Widget.Gtk_Widget_Record’Class;<br />
Child : access Gtk.Widget.Gtk_Widget_Record’Class;<br />
Left_Attach : in Guint;<br />
Left_Attach : in Guint;<br />
Right_Attach : in Guint;<br />
Right_Attach : in Guint;<br />
Top_Attach : in Guint;<br />
Top_Attach : in Guint;<br />
Bottom_Attach : in Guint;<br />
Bottom_Attach : in Guint;<br />
Xoptions : in Gtk_Attach_Options := Expand or Fill;<br />
Xoptions : in Gtk_Attach_Options := Expand or Fill;<br />
Yoptions : in Gtk_Attach_Options := Expand or Fill;<br />
Yoptions : in Gtk_Attach_Options := Expand or Fill;<br />
Xpadding : in Guint := 0;<br />
Xpadding : in Guint := 0;<br />
Ypadding : in Guint := 0);<br />
Ypadding : in Guint := 0);<br />
procedure Set_Row_Spacing<br />
procedure Set_Row_Spacing<br />
(Table : access Gtk_Table_Record;<br />
(Table : access Gtk_Table_Record;<br />
Row : in Guint;<br />
Row : in Guint;<br />
Spacing : in Guint);<br />
Spacing : in Guint);
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✔Attach Options<br />
– Fill: the widget will expand to use all the room<br />
available<br />
– Shrink: the widget will shrink the table<br />
– Expand: Cause the taqble to expand to use up<br />
any remaining space in the window
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✔ General steps to creating a widget:<br />
– Gtk_New – one of various functions to create a<br />
new widget<br />
– Connect all signals and events we wish to use to<br />
the appropriate handlers<br />
– Set the attributes of the widget<br />
– Pack the widget into a container using the<br />
appropriate call such as Gtk.Container.Add or<br />
Gtk.Box.Pack_Start<br />
– Gtk.Widget.Show the widget
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✔ The following widgets do not have an associated<br />
window. To capture events, use the Event_Box<br />
– Gtk_Alignment, Gtk_Arrow, Gtk_Bin, Gtk_Box, Gtk_Image,<br />
Gtk_Item, Gtk_Label, Gtk_Pixmap, Gtk_Scrolled_Window,<br />
Gtk_Separator, Gtk_Table, Gtk_Aspect_Frame, Gtk_Frame,<br />
Gtk_Vbox, Gtk_Hbox, Gtk_Vseparator, Gtk_Hseparator
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✔ The Button Widget<br />
– Normal Buttons<br />
– Toggle Buttons<br />
– Check Buttons<br />
– Radio Buttons<br />
✔Adjustments<br />
✔Range Widget<br />
– Scrollbar<br />
– Scale
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✔Name<br />
✔Style<br />
✔Position<br />
✔Size<br />
✔Accelerators<br />
✔…
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✔Timeout<br />
Function Timeout_Add<br />
Function Timeout_Add<br />
(Interval : in Guint32;<br />
(Interval : in Guint32;<br />
Func : Timeout_Callback)<br />
Func : Timeout_Callback)<br />
return Timeout_Handler_Id;<br />
return Timeout_Handler_Id;<br />
procedure Timeout_Remove (Id : in Timeout_Handler_Id);<br />
procedure Timeout_Remove (Id : in Timeout_Handler_Id);<br />
✔Idle Function<br />
function Idle_Add<br />
function Idle_Add<br />
(Cb : in Idle_Callback;<br />
(Cb : in Idle_Callback;<br />
Priority : in Idle_Priority := Priority_Default_Idle)<br />
Priority : in Idle_Priority := Priority_Default_Idle)<br />
return Idle_Handler_Id;<br />
return Idle_Handler_Id;<br />
procedure Idle_Remove (Id : in Idle_Handler_Id);<br />
procedure Idle_Remove (Id : in Idle_Handler_Id);
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✔Overview<br />
✔Two types of Widgets<br />
– Visuals<br />
– Containers<br />
✔Easy to change properties at any time:<br />
– Signals and callbacks<br />
– Position<br />
– Widget specific data
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✔EditorEditor<br />
✔Open Open Dialog
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