File : terminal_interface-curses-mouse.adb
------------------------------------------------------------------------------
-- --
-- GNAT ncurses Binding --
-- --
-- Terminal_Interface.Curses.Mouse --
-- --
-- B O D Y --
-- --
------------------------------------------------------------------------------
-- Copyright (c) 1998-2004,2008 Free Software Foundation, Inc. --
-- --
-- Permission is hereby granted, free of charge, to any person obtaining a --
-- copy of this software and associated documentation files (the --
-- "Software"), to deal in the Software without restriction, including --
-- without limitation the rights to use, copy, modify, merge, publish, --
-- distribute, distribute with modifications, sublicense, and/or sell --
-- copies of the Software, and to permit persons to whom the Software is --
-- furnished to do so, subject to the following conditions: --
-- --
-- The above copyright notice and this permission notice shall be included --
-- in all copies or substantial portions of the Software. --
-- --
-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS --
-- OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF --
-- MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. --
-- IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, --
-- DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR --
-- OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR --
-- THE USE OR OTHER DEALINGS IN THE SOFTWARE. --
-- --
-- Except as contained in this notice, the name(s) of the above copyright --
-- holders shall not be used in advertising or otherwise to promote the --
-- sale, use or other dealings in this Software without prior written --
-- authorization. --
------------------------------------------------------------------------------
-- Author: Juergen Pfeifer, 1996
-- Version Control:
-- @Revision: 1.22 @
-- @Date: 2008/07/26 18:51:11 @
-- Binding Version 01.00
------------------------------------------------------------------------------
with Terminal_Interface.Curses.Aux; use Terminal_Interface.Curses.Aux;
with Interfaces.C; use Interfaces.C;
use Interfaces;
package body Terminal_Interface.Curses.Mouse is
use type System.Bit_Order;
function Has_Mouse return Boolean
is
function Mouse_Avail return C_Int;
pragma Import (C, Mouse_Avail, "_nc_has_mouse");
begin
if Has_Key (Key_Mouse) or else Mouse_Avail /= 0 then
return True;
else
return False;
end if;
end Has_Mouse;
function Get_Mouse return Mouse_Event
is
type Event_Access is access all Mouse_Event;
function Getmouse (Ev : Event_Access) return C_Int;
pragma Import (C, Getmouse, "getmouse");
Event : aliased Mouse_Event;
begin
if Getmouse (Event'Access) = Curses_Err then
raise Curses_Exception;
end if;
return Event;
end Get_Mouse;
procedure Register_Reportable_Event (Button : in Mouse_Button;
State : in Button_State;
Mask : in out Event_Mask)
is
Button_Nr : constant Natural := Mouse_Button'Pos (Button);
State_Nr : constant Natural := Button_State'Pos (State);
begin
if Button in Modifier_Keys and then State /= Pressed then
raise Curses_Exception;
else
if Button in Real_Buttons then
Mask := Mask or ((2 ** (6 * Button_Nr)) ** State_Nr);
else
Mask := Mask or (BUTTON_CTRL ** (Button_Nr - 4));
end if;
end if;
end Register_Reportable_Event;
procedure Register_Reportable_Events (Button : in Mouse_Button;
State : in Button_States;
Mask : in out Event_Mask)
is
begin
for S in Button_States'Range loop
if State (S) then
Register_Reportable_Event (Button, S, Mask);
end if;
end loop;
end Register_Reportable_Events;
function Start_Mouse (Mask : Event_Mask := All_Events)
return Event_Mask
is
function MMask (M : Event_Mask;
O : access Event_Mask) return Event_Mask;
pragma Import (C, MMask, "mousemask");
R : Event_Mask;
Old : aliased Event_Mask;
begin
R := MMask (Mask, Old'Access);
if R = No_Events then
Beep;
end if;
return Old;
end Start_Mouse;
procedure End_Mouse (Mask : in Event_Mask := No_Events)
is
begin
if Mask /= No_Events then
Beep;
end if;
end End_Mouse;
procedure Dispatch_Event (Mask : in Event_Mask;
Button : out Mouse_Button;
State : out Button_State);
procedure Dispatch_Event (Mask : in Event_Mask;
Button : out Mouse_Button;
State : out Button_State) is
L : Event_Mask;
begin
Button := Alt; -- preset to non real button;
if (Mask and BUTTON1_EVENTS) /= 0 then
Button := Left;
elsif (Mask and BUTTON2_EVENTS) /= 0 then
Button := Middle;
elsif (Mask and BUTTON3_EVENTS) /= 0 then
Button := Right;
elsif (Mask and BUTTON4_EVENTS) /= 0 then
Button := Button4;
end if;
if Button in Real_Buttons then
L := 2 ** (6 * Mouse_Button'Pos (Button));
for I in Button_State'Range loop
if (Mask and L) /= 0 then
State := I;
exit;
end if;
L := 2 * L;
end loop;
else
State := Pressed;
if (Mask and BUTTON_CTRL) /= 0 then
Button := Control;
elsif (Mask and BUTTON_SHIFT) /= 0 then
Button := Shift;
elsif (Mask and BUTTON_ALT) /= 0 then
Button := Alt;
end if;
end if;
end Dispatch_Event;
procedure Get_Event (Event : in Mouse_Event;
Y : out Line_Position;
X : out Column_Position;
Button : out Mouse_Button;
State : out Button_State)
is
Mask : constant Event_Mask := Event.Bstate;
begin
X := Column_Position (Event.X);
Y := Line_Position (Event.Y);
Dispatch_Event (Mask, Button, State);
end Get_Event;
procedure Unget_Mouse (Event : in Mouse_Event)
is
function Ungetmouse (Ev : Mouse_Event) return C_Int;
pragma Import (C, Ungetmouse, "ungetmouse");
begin
if Ungetmouse (Event) = Curses_Err then
raise Curses_Exception;
end if;
end Unget_Mouse;
function Enclosed_In_Window (Win : Window := Standard_Window;
Event : Mouse_Event) return Boolean
is
function Wenclose (Win : Window; Y : C_Int; X : C_Int)
return Curses_Bool;
pragma Import (C, Wenclose, "wenclose");
begin
if Wenclose (Win, C_Int (Event.Y), C_Int (Event.X))
= Curses_Bool_False then
return False;
else
return True;
end if;
end Enclosed_In_Window;
function Mouse_Interval (Msec : Natural := 200) return Natural
is
function Mouseinterval (Msec : C_Int) return C_Int;
pragma Import (C, Mouseinterval, "mouseinterval");
begin
return Natural (Mouseinterval (C_Int (Msec)));
end Mouse_Interval;
end Terminal_Interface.Curses.Mouse;