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with Glib; use Glib;
with Gdk.Color; use Gdk.Color;
with Gdk.GC; use Gdk.GC;
with Gdk.Drawable; use Gdk.Drawable;
with Gtk.Adjustment; use Gtk.Adjustment;
with Gtk.Window; use Gtk.Window;
with Gtk.Enums; use Gtk.Enums;
with Gtk.Handlers; use Gtk.Handlers;
with Gtk.Button; use Gtk.Button;
with Gtk.Box; use Gtk.Box;
with Gtk.Label; use Gtk.Label;
with Gtk.Widget; use Gtk.Widget;
with Double_Buffer; use Double_Buffer;
with Gtk.Toggle_Button; use Gtk.Toggle_Button;
with Gtk.Main; use Gtk.Main;
with Gtk.Text_Buffer; use Gtk.Text_Buffer;
with Gtk.Text_View; use Gtk.Text_View;
with Gtk.Scrolled_Window; use Gtk.Scrolled_Window;
with Gtk.Type_Conversion;
pragma Warnings (Off, Gtk.Type_Conversion);
-- So that we can get the child of a button (a Gtk_Label) even if it
-- was created at the C level
pragma Elaborate_All (Gtk.Handlers);
with Ada.Numerics.Discrete_Random;
package body Full_Test is
package Void_Cb is new Gtk.Handlers.User_Callback
(Widget_Type => Gtk_Toggle_Button_Record,
User_Type => Gtk_Double_Buffer);
package Button_Cb is new Gtk.Handlers.Callback
(Widget_Type => Gtk_Double_Buffer_Record);
package Quit_Cb is new Gtk.Handlers.Callback
(Widget_Type => Gtk_Window_Record);
Pixmap_Width : constant Gint := 400;
Pixmap_Height : constant Gint := 250;
subtype My_Gint is Gint range 0 .. Gint'Min (Pixmap_Width, Pixmap_Height);
package Gint_Random is new Ada.Numerics.Discrete_Random (My_Gint);
Gen : Gint_Random.Generator;
subtype Color_Index is Natural range 1 .. 5;
Colors : Gdk_Color_Array (Color_Index'Range);
package Color_Random is new Ada.Numerics.Discrete_Random (Color_Index);
Gen_Color : Color_Random.Generator;
White_Gc : Gdk.GC.Gdk_GC;
Black_Gc : Gdk.GC.Gdk_GC;
-----------------------
-- Toggle_Back_Store --
-----------------------
procedure Toggle_Back_Store (Button : access Gtk_Toggle_Button_Record'Class;
Buffer : Gtk_Double_Buffer) is
begin
Set_Back_Store (Buffer, Get_Active (Button));
end Toggle_Back_Store;
-------------------
-- Toggle_Triple --
-------------------
procedure Toggle_Triple (Button : access Gtk_Toggle_Button_Record'Class;
Buffer : Gtk_Double_Buffer) is
begin
Set_Triple_Buffer (Buffer, Get_Active (Button));
end Toggle_Triple;
-------------------
-- Toggle_Freeze --
-------------------
procedure Toggle_Freeze (Button : access Gtk_Toggle_Button_Record'Class;
Buffer : Gtk_Double_Buffer)
is
Label : Gtk_Label;
begin
-- The following call only works thanks to
-- the 'with Gtk.Type_Conversion', since the label is created in C
-- and not in Ada.
Label := Gtk_Label (Widget_List.Get_Data (Children (Button)));
if Get_Active (Button) then
Freeze (Buffer);
Set_Text (Label, "Thaw");
else
Thaw (Buffer);
Set_Text (Gtk_Label (Widget_List.Get_Data (Children (Button))),
"Freeze");
end if;
end Toggle_Freeze;
----------
-- Draw --
----------
procedure Draw (Buffer : access Gtk_Double_Buffer_Record'Class) is
X : Gint := Gint (Gint_Random.Random (Gen));
Y : Gint := Gint (Gint_Random.Random (Gen));
begin
Gdk.GC.Set_Foreground (Black_Gc,
Colors (Color_Random.Random (Gen_Color)));
Draw_Rectangle (Get_Pixmap (Buffer),
Black_Gc, False,
X, Y, 50, 30);
end Draw;
-----------
-- Reset --
-----------
procedure Reset (Buffer : access Gtk_Double_Buffer_Record'Class) is
begin
Draw_Rectangle (Get_Pixmap (Buffer),
White_Gc, True, 0, 0,
Gint (Get_Allocation_Width (Buffer)),
Gint (Get_Allocation_Height (Buffer)));
end Reset;
----------------
-- Force_Draw --
----------------
procedure Force_Draw (Buffer : access Gtk_Double_Buffer_Record'Class) is
begin
Double_Buffer.Draw (Buffer);
end Force_Draw;
----------
-- Quit --
----------
procedure Quit (Win : access Gtk_Window_Record'Class) is
pragma Warnings (Off, Win);
begin
Gtk.Main.Gtk_Exit (0);
end Quit;
----------
-- Help --
----------
function Help return String is
LF : constant Character := ASCII.LF;
begin
return "This demo shows how the double_buffer works:"
& LF
& "You can draw random rectangles on the off-screen pixmap thanks"
& LF & " to the DRAW button."
& LF & LF
& "The rectangles will not appear on the screen before you explictly"
& LF
& " call Gtk.Widget.Draw (button GTK.WIDGET.DRAW). This copies the"
& LF
& " off-screen pixmap both to the screen and to the triple buffer if"
& LF
& " you are using it."
& LF & LF
& "You should also examine how the double_buffer behaves with regards"
& LF
& " to expose event. The simplest way to test that is to hide part or"
& LF
& " all of the window, and show it again."
& LF & LF
& "The following scenarii are worth examining:"
& LF & LF
& " - If no Triple_Buffer is used and the window not frozen."
& LF & LF
& " The screen is updated from the off-screen pixmap whenever you"
& LF
& " click on DRAW or force an expose event. If you are in the" & LF
& " process of doing a long draw operation (multiple DRAW clicks)"
& LF
& " the screen is updated anyway with whatever is displayed on"
& LF & " the off-screen buffer at the time."
& LF & LF
& " - If no Triple_Buffer is used and the window is frozen."
& LF & LF &
" The screen is not updated when an expose event happens, and the"
& LF
& " update is delayed until the widget is thawed." & LF
& " Likewise, the screen is not updated even when you call" & LF
& " Gtk.Widget.Draw."
& LF & LF
& " - If a Triple_Buffer is used and the window is not frozen."
& LF & LF &
" The screen is updated from the triple buffer. Thus you can draw"
& LF
& " anything on the double-buffer, it won't be visible on the"
& LF
& " screen until you call Gtk.Widget.Draw, even if some expose"
& LF
& " event happens during a long draw operation."
& LF & LF
& " - If a Triple_Buffer is used and the window is frozen."
& LF & LF
& " The screen is still updated from the triple buffer. However,"
& LF
& " the double buffer is never copied to the triple buffer, even"
& LF
& " when you call Gtk.Widget.Draw. When the widget is thawed, the"
& LF
& " double buffer is copied to the triple buffer if required."
& LF & LF
& "The value of Back_Store is used when the widget is resized. If its"
& LF
& " value is False, then the content of the pixmap is not saved when"
& LF
& " widget is resized, and the new content of the pixmap is random."
& LF &
"If its value is True, then the content is restored, and if required"
& LF
& " is completed by an solid color (chosen from the Gtk_Style of the"
& LF
& " widget).";
end Help;
----------
-- Init --
----------
procedure Init is
Win : Gtk_Window;
Vbox,
Hbox,
Box : Gtk_Box;
Buffer : Gtk_Double_Buffer;
Button : Gtk_Button;
Toggle : Gtk_Toggle_Button;
Text : Gtk_Text_View;
Text_Buffer : Gtk_Text_Buffer;
Scrolled : Gtk_Scrolled_Window;
Color : Gdk.Color.Gdk_Color;
Result : Gint;
Success : Boolean_Array (Color_Index'Range);
begin
Gtk_New (Win, Window_Toplevel);
Set_Title (Win, "Double_Buffer tests");
Quit_Cb.Connect (Win, "destroy", Quit_Cb.To_Marshaller (Quit'Access));
Gtk_New_Vbox (Vbox, Homogeneous => False);
Add (Win, Vbox);
Gtk_New_Hbox (Hbox, Homogeneous => False, Spacing => 5);
Pack_Start (Vbox, Hbox);
Gtk_New_Vbox (Box, Homogeneous => False, Spacing => 5);
Pack_Start (Hbox, Box, Expand => False, Fill => False);
Gtk_New (Buffer);
Set_Back_Store (Buffer, True);
Set_Triple_Buffer (Buffer, False);
Set_USize (Buffer, Pixmap_Width, Pixmap_Height);
Pack_Start (Hbox, Buffer, Expand => True);
Gtk_New (Button, "Rectangle");
Pack_Start (Box, Button, Expand => False);
Button_Cb.Object_Connect (Button, "clicked",
Button_Cb.To_Marshaller (Draw'Access),
Buffer);
Gtk_New (Button, "Gtk.Widget.Draw");
Pack_Start (Box, Button, Expand => False);
Button_Cb.Object_Connect (Button, "clicked",
Button_Cb.To_Marshaller (Force_Draw'Access),
Buffer);
Gtk_New (Button, "Reset");
Pack_Start (Box, Button, Expand => False);
Button_Cb.Object_Connect (Button, "clicked",
Button_Cb.To_Marshaller (Reset'Access),
Buffer);
Gtk_New (Toggle, "Freeze");
Pack_End (Box, Toggle, Expand => False);
Void_Cb.Connect (Toggle, "clicked",
Void_Cb.To_Marshaller (Toggle_Freeze'Access),
Buffer);
Gtk_New (Toggle, "Back Store");
Set_Active (Toggle, True);
Pack_End (Box, Toggle, Expand => False);
Void_Cb.Connect (Toggle, "clicked",
Void_Cb.To_Marshaller (Toggle_Back_Store'Access),
Buffer);
Gtk_New (Toggle, "Use Triple Buffer");
Pack_End (Box, Toggle, Expand => False);
Void_Cb.Connect (Toggle, "clicked",
Void_Cb.To_Marshaller (Toggle_Triple'Access),
Buffer);
Gtk_New (Scrolled);
Set_Policy (Scrolled, Policy_Automatic, Policy_Automatic);
Pack_Start (Vbox, Scrolled);
Gtk_New (Text_Buffer);
Gtk_New (Text, Text_Buffer);
Set_Editable (Text, False);
Set_USize (Text, Pixmap_Width, 250);
Add (Scrolled, Text);
Set_Text (Text_Buffer, Help);
Show_All (Win);
Gdk.GC.Gdk_New (White_Gc, Get_Window (Buffer));
Color := Gdk.Color.Parse ("black");
Gdk.Color.Alloc (Get_Default_Colormap, Color);
Gdk.GC.Set_Foreground (White_Gc, Color);
Reset (Buffer);
Double_Buffer.Draw (Buffer);
Colors (1) := Gdk.Color.Parse ("blue");
Colors (2) := Gdk.Color.Parse ("red");
Colors (3) := Gdk.Color.Parse ("green");
Colors (4) := Gdk.Color.Parse ("yellow");
Colors (5) := Gdk.Color.Parse ("orange");
Alloc_Colors (Get_Default_Colormap,
Colors,
Writeable => False,
Best_Match => True,
Success => Success,
Result => Result);
Gdk.GC.Gdk_New (Black_Gc, Get_Window (Buffer));
end Init;
end Full_Test;
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