Ada95/src/terminal_interface-curses-mouse.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                           GNAT ncurses Binding                           --
   4 --                                                                          --
   5 --                     Terminal_Interface.Curses.Mouse                      --
   6 --                                                                          --
   7 --                                 B O D Y                                  --
   8 --                                                                          --
   9 ------------------------------------------------------------------------------
  10 -- Copyright (c) 1998 Free Software Foundation, Inc.                        --
  11 --                                                                          --
  12 -- Permission is hereby granted, free of charge, to any person obtaining a  --
  13 -- copy of this software and associated documentation files (the            --
  14 -- "Software"), to deal in the Software without restriction, including      --
  15 -- without limitation the rights to use, copy, modify, merge, publish,      --
  16 -- distribute, distribute with modifications, sublicense, and/or sell       --
  17 -- copies of the Software, and to permit persons to whom the Software is    --
  18 -- furnished to do so, subject to the following conditions:                 --
  19 --                                                                          --
  20 -- The above copyright notice and this permission notice shall be included  --
  21 -- in all copies or substantial portions of the Software.                   --
  22 --                                                                          --
  23 -- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  --
  24 -- OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               --
  25 -- MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   --
  26 -- IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   --
  27 -- DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    --
  28 -- OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    --
  29 -- THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               --
  30 --                                                                          --
  31 -- Except as contained in this notice, the name(s) of the above copyright   --
  32 -- holders shall not be used in advertising or otherwise to promote the     --
  33 -- sale, use or other dealings in this Software without prior written       --
  34 -- authorization.                                                           --
  35 ------------------------------------------------------------------------------
  36 --  Author:  Juergen Pfeifer, 1996
  37 --  Contact: http://www.familiepfeifer.de/Contact.aspx?Lang=en
  38 --  Version Control:
  39 --  $Revision: 1.17 $
  40 --  Binding Version 01.00
  41 ------------------------------------------------------------------------------
  42 with System;
  43
  44 with Terminal_Interface.Curses.Aux; use Terminal_Interface.Curses.Aux;
  45 with Interfaces.C; use Interfaces.C;
  46 use Interfaces;
  47
  48 package body Terminal_Interface.Curses.Mouse is
  49
  50    use type System.Bit_Order;
  51    use type Interfaces.C.int;
  52
  53    function Has_Mouse return Boolean
  54    is
  55       function Mouse_Avail return C_Int;
  56       pragma Import (C, Mouse_Avail, "_nc_has_mouse");
  57    begin
  58       if Has_Key (Key_Mouse) or else Mouse_Avail /= 0 then
  59          return True;
  60       else
  61          return False;
  62       end if;
  63    end Has_Mouse;
  64
  65    function Get_Mouse return Mouse_Event
  66    is
  67       type Event_Access is access all Mouse_Event;
  68
  69       function Getmouse (Ev : Event_Access) return C_Int;
  70       pragma Import (C, Getmouse, "getmouse");
  71
  72       Event : aliased Mouse_Event;
  73    begin
  74       if Getmouse (Event'Access) = Curses_Err then
  75          raise Curses_Exception;
  76       end if;
  77       return Event;
  78    end Get_Mouse;
  79
  80    procedure Register_Reportable_Event (Button : in Mouse_Button;
  81                                         State  : in Button_State;
  82                                         Mask   : in out Event_Mask)
  83    is
  84       Button_Nr : constant Natural := Mouse_Button'Pos (Button);
  85       State_Nr  : constant Natural := Button_State'Pos (State);
  86    begin
  87       if Button in Modifier_Keys and then State /= Pressed then
  88          raise Curses_Exception;
  89       else
  90          if Button in Real_Buttons then
  91             Mask := Mask or ((2 ** (6 * Button_Nr)) ** State_Nr);
  92          else
  93             Mask := Mask or (BUTTON_CTRL ** (Button_Nr - 4));
  94          end if;
  95       end if;
  96    end Register_Reportable_Event;
  97
  98    procedure Register_Reportable_Events (Button : in Mouse_Button;
  99                                          State  : in Button_States;
 100                                          Mask   : in out Event_Mask)
 101    is
 102    begin
 103       for S in Button_States'Range loop
 104          if State (S) then
 105             Register_Reportable_Event (Button, S, Mask);
 106          end if;
 107       end loop;
 108    end Register_Reportable_Events;
 109
 110    function Start_Mouse (Mask : Event_Mask := All_Events)
 111                          return Event_Mask
 112    is
 113       function MMask (M : Event_Mask;
 114                       O : access Event_Mask) return Event_Mask;
 115       pragma Import (C, MMask, "mousemask");
 116       R   : Event_Mask;
 117       Old : aliased Event_Mask;
 118    begin
 119       R := MMask (Mask, Old'Access);
 120       return Old;
 121    end Start_Mouse;
 122
 123    procedure End_Mouse (Mask : in Event_Mask := No_Events)
 124    is
 125    begin
 126       null;
 127    end End_Mouse;
 128
 129    procedure Dispatch_Event (Mask   : in  Event_Mask;
 130                              Button : out Mouse_Button;
 131                              State  : out Button_State);
 132
 133    procedure Dispatch_Event (Mask   : in  Event_Mask;
 134                              Button : out Mouse_Button;
 135                              State  : out Button_State) is
 136       L : Event_Mask;
 137    begin
 138       Button := Alt;  --  preset to non real button;
 139       if (Mask and BUTTON1_EVENTS) /= 0 then
 140          Button := Left;
 141       elsif (Mask and BUTTON2_EVENTS) /= 0 then
 142          Button := Middle;
 143       elsif (Mask and BUTTON3_EVENTS) /= 0 then
 144          Button := Right;
 145       elsif (Mask and BUTTON4_EVENTS) /= 0 then
 146          Button := Button4;
 147       end if;
 148       if Button in Real_Buttons then
 149          L := 2 ** (6 * Mouse_Button'Pos (Button));
 150          for I in Button_State'Range loop
 151             if (Mask and L) /= 0 then
 152                State := I;
 153                exit;
 154             end if;
 155             L := 2 * L;
 156          end loop;
 157       else
 158          State := Pressed;
 159          if (Mask and BUTTON_CTRL) /= 0 then
 160             Button := Control;
 161          elsif (Mask and BUTTON_SHIFT) /= 0 then
 162             Button := Shift;
 163          elsif (Mask and BUTTON_ALT) /= 0 then
 164             Button := Alt;
 165          end if;
 166       end if;
 167    end Dispatch_Event;
 168
 169    procedure Get_Event (Event  : in  Mouse_Event;
 170                         Y      : out Line_Position;
 171                         X      : out Column_Position;
 172                         Button : out Mouse_Button;
 173                         State  : out Button_State)
 174    is
 175       Mask  : constant Event_Mask := Event.Bstate;
 176    begin
 177       X := Column_Position (Event.X);
 178       Y := Line_Position   (Event.Y);
 179       Dispatch_Event (Mask, Button, State);
 180    end Get_Event;
 181
 182    procedure Unget_Mouse (Event : in Mouse_Event)
 183    is
 184       function Ungetmouse (Ev : Mouse_Event) return C_Int;
 185       pragma Import (C, Ungetmouse, "ungetmouse");
 186    begin
 187       if Ungetmouse (Event) = Curses_Err then
 188          raise Curses_Exception;
 189       end if;
 190    end Unget_Mouse;
 191
 192    function Enclosed_In_Window (Win    : Window := Standard_Window;
 193                                 Event  : Mouse_Event) return Boolean
 194    is
 195       function Wenclose (Win : Window; Y : C_Int; X : C_Int)
 196                          return Curses_Bool;
 197       pragma Import (C, Wenclose, "wenclose");
 198    begin
 199       if Wenclose (Win, C_Int (Event.Y), C_Int (Event.X))
 200         = Curses_Bool_False then
 201          return False;
 202       else
 203          return True;
 204       end if;
 205    end Enclosed_In_Window;
 206
 207    function Mouse_Interval (Msec : Natural := 200) return Natural
 208    is
 209       function Mouseinterval (Msec : C_Int) return C_Int;
 210       pragma Import (C, Mouseinterval, "mouseinterval");
 211    begin
 212       return Natural (Mouseinterval (C_Int (Msec)));
 213    end Mouse_Interval;
 214
 215 end Terminal_Interface.Curses.Mouse;