## Documentation

Table of Contents
Class Inheritance Tree
Widget Screenshots
Package groups

## Index

Package: Drawing_Area

- Goto spec source

# Description

    package Gtk.Drawing_Area is

This widget provides an empty canvas on which the application can draw anything.

Note that this widget is simply an empty space, and that you need to connect it to events to make it useful. For instance, you might want to do one of the following :

* Connect it to "expose_event": The handlers are called every time the widget needs to be redrawn. You can then draw anything you want on the canvas, after getting its associated window with a call to Gtk.Widget.Get_Window. Note that the event mask is automatically set up to accept expose_events.

* Connect it to "button_press_event" and "button_release_event" events, when you want it to react to user input. Note that you need to set up the event mask with a call to Gtk.Widget.Set_Events.

See also the Double_Buffer widget provided in the GtkAda examples for an advanced example that demonstrates how to use double buffering, to avoid flickering in your drawings.

<testgtk>libart_demo.adb</testgtk>

# Packages

### Implements_Buildable (new Glib.Types.Implements)

    package Implements_Buildable is new Glib.Types.Implements
         (Gtk.Buildable.Gtk_Buildable, Gtk_Drawing_Area_Record, Gtk_Drawing_Area);

# Classes

### Gtk_Drawing_Area_Record

- Goto declaration in source

    type Gtk_Drawing_Area_Record is new Gtk_Widget_Record with null record;

#### Ancestors:

Gtk.Widget.Gtk_Widget_Record
Glib.Object.GObject_Record

#### Immediate Children:

Gtk.Curve.Gtk_Curve_Record
Gtk.Spinner.Gtk_Spinner_Record
Gtkada.Canvas.Interactive_Canvas_Record

#### Primitive operations:

Glib.Object.Deallocate

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Glib.Object.Get_Type

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Glib.Object.Notify

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Glib.Object.Ref

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Glib.Object.Ref_Sink

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Glib.Object.Unref

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Gtk.Widget.Activate

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Gtk.Widget.Add_Accelerator

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Gtk.Widget.Add_Events

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Gtk.Widget.Add_Mnemonic_Label

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Gtk.Widget.Can_Activate_Accel

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Gtk.Widget.Child_Notify

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Gtk.Widget.Class_Path

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Gtk.Widget.Class_Path_Reversed

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Gtk.Widget.Create_Pango_Context

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Gtk.Widget.Create_Pango_Layout

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Gtk.Widget.Destroy

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Gtk.Widget.Draw

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Gtk.Widget.Ensure_Style

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Gtk.Widget.Error_Bell

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Gtk.Widget.Flag_Is_Set

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Gtk.Widget.Flags

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Gtk.Widget.Freeze_Child_Notify

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Gtk.Widget.Get_Allocation_Height

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Gtk.Widget.Get_Allocation_Width

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Gtk.Widget.Get_Allocation_X

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Gtk.Widget.Get_Allocation_Y

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Gtk.Widget.Get_Ancestor

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Gtk.Widget.Get_Child_Requisition

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Gtk.Widget.Get_Child_Visible

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Gtk.Widget.Get_Colormap

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Gtk.Widget.Get_Composite_Name

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Gtk.Widget.Get_Direction

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Gtk.Widget.Get_Events

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Gtk.Widget.Get_Extension_Events

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Gtk.Widget.Get_Has_Tooltip

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Gtk.Widget.Get_Name

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Gtk.Widget.Get_No_Show_All

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Gtk.Widget.Get_Pango_Context

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Gtk.Widget.Get_Parent

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Gtk.Widget.Get_Parent_Window

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Gtk.Widget.Get_Pointer

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Gtk.Widget.Get_Root_Window

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Gtk.Widget.Get_Size_Request

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Gtk.Widget.Get_Snapshot

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Gtk.Widget.Get_State

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Gtk.Widget.Get_Style

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Gtk.Widget.Get_Tooltip_Markup

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Gtk.Widget.Get_Tooltip_Text

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Gtk.Widget.Get_Tooltip_Window

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Gtk.Widget.Get_Toplevel

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Gtk.Widget.Get_Visual

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Gtk.Widget.Get_Window

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Gtk.Widget.Grab_Default

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Gtk.Widget.Grab_Focus

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Gtk.Widget.Has_Screen

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Gtk.Widget.Hide

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Gtk.Widget.Hide_All

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Gtk.Widget.Input_Shape_Combine_Mask

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Gtk.Widget.Intersect

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Gtk.Widget.Is_Ancestor

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Gtk.Widget.Is_Composited

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Gtk.Widget.Is_Focus

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Gtk.Widget.Keynav_Failed

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Gtk.Widget.List_Mnemonic_Labels

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Gtk.Widget.Map

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Gtk.Widget.Mnemonic_Activate

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Gtk.Widget.Modify_Base

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Gtk.Widget.Modify_Bg

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Gtk.Widget.Modify_Cursor

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Gtk.Widget.Modify_Fg

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Gtk.Widget.Modify_Font

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Gtk.Widget.Modify_Text

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Gtk.Widget.Path

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Gtk.Widget.Path_Reversed

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Gtk.Widget.Queue_Clear

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Gtk.Widget.Queue_Clear_Area

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Gtk.Widget.Queue_Draw

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Gtk.Widget.Queue_Draw_Area

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Gtk.Widget.Queue_Resize

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Gtk.Widget.Queue_Resize_No_Redraw

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Gtk.Widget.Realize

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Gtk.Widget.Region_Intersect

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Gtk.Widget.Remove_Accelerator

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Gtk.Widget.Remove_Mnemonic_Label

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Gtk.Widget.Render_Icon

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Gtk.Widget.Reparent

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Gtk.Widget.Reset_Rc_Styles

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Gtk.Widget.Reset_Shapes

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Gtk.Widget.Restore_Default_Style

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Gtk.Widget.Send_Expose

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Gtk.Widget.Set_Accel_Path

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Gtk.Widget.Set_App_Paintable

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Gtk.Widget.Set_Child_Visible

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Gtk.Widget.Set_Colormap

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Gtk.Widget.Set_Composite_Name

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Gtk.Widget.Set_Direction

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Gtk.Widget.Set_Double_Buffered

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Gtk.Widget.Set_Events

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Gtk.Widget.Set_Extension_Events

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Gtk.Widget.Set_Flags

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Gtk.Widget.Set_Has_Tooltip

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Gtk.Widget.Set_Name

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Gtk.Widget.Set_No_Show_All

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Gtk.Widget.Set_Parent

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Gtk.Widget.Set_Parent_Window

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Gtk.Widget.Set_Redraw_On_Allocate

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Gtk.Widget.Set_Scroll_Adjustments

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Gtk.Widget.Set_Sensitive

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Gtk.Widget.Set_Size_Request

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Gtk.Widget.Set_State

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Gtk.Widget.Set_Style

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Gtk.Widget.Set_Tooltip_Markup

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Gtk.Widget.Set_Tooltip_Text

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Gtk.Widget.Set_Tooltip_Window

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Gtk.Widget.Set_UPosition

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Gtk.Widget.Set_USize

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Gtk.Widget.Set_Window

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Gtk.Widget.Shape_Combine_Mask

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Gtk.Widget.Show

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Gtk.Widget.Show_All

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Gtk.Widget.Show_Now

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Gtk.Widget.Size_Allocate

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Gtk.Widget.Size_Request

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Gtk.Widget.Style_Get_Property

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Gtk.Widget.Thaw_Child_Notify

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Gtk.Widget.Trigger_Tooltip_Query

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Gtk.Widget.Unmap

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Gtk.Widget.Unrealize

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Gtk.Widget.Unset_Flags

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Size

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# Types

### Gtk_Drawing_Area

- Goto declaration in source

    type Gtk_Drawing_Area is access all Gtk_Drawing_Area_Record'Class;

# Subprograms & Entries

### Gtk_New

- Goto spec in source

    procedure Gtk_New (Drawing_Area: out Gtk_Drawing_Area);

### Initialize

- Goto spec in source

    procedure Initialize (Drawing_Area: access Gtk_Drawing_Area_Record'Class);

### Get_Type

- Goto spec in source
- Goto body in source

    function Get_Type return Glib.GType;

### Size

- Goto spec in source

    procedure Size (Drawing_Area: access Gtk_Drawing_Area_Record;Width: Gint;Height: Gint);

### +

- Goto spec in source

    function "+" (Widget: access Gtk_Drawing_Area_Record'Class) return Gtk.Buildable.Gtk_Buildable renames Implements_Buildable.To_Interface;

### -

- Goto spec in source

    function "-" (Interf: Gtk.Buildable.Gtk_Buildable) return Gtk_Drawing_Area renames Implements_Buildable.To_Object;