release/src/router/libncurses/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) 1998-2009,2014 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 --  Version Control:
  38 --  $Revision: 1.25 $
  39 --  $Date: 2014/09/13 19:10:18 $
  40 --  Binding Version 01.00
  41 ------------------------------------------------------------------------------
  42 with Terminal_Interface.Curses.Aux; use Terminal_Interface.Curses.Aux;
  43 with Interfaces.C; use Interfaces.C;
  44 use Interfaces;
  45
  46 package body Terminal_Interface.Curses.Mouse is
  47
  48    use type System.Bit_Order;
  49
  50    function Has_Mouse return Boolean
  51    is
  52       function Mouse_Avail return C_Int;
  53       pragma Import (C, Mouse_Avail, "has_mouse");
  54    begin
  55       if Has_Key (Key_Mouse) or else Mouse_Avail /= 0 then
  56          return True;
  57       else
  58          return False;
  59       end if;
  60    end Has_Mouse;
  61
  62    function Get_Mouse return Mouse_Event
  63    is
  64       type Event_Access is access all Mouse_Event;
  65
  66       function Getmouse (Ev : Event_Access) return C_Int;
  67       pragma Import (C, Getmouse, "getmouse");
  68
  69       Event : aliased Mouse_Event;
  70    begin
  71       if Getmouse (Event'Access) = Curses_Err then
  72          raise Curses_Exception;
  73       end if;
  74       return Event;
  75    end Get_Mouse;
  76
  77    procedure Register_Reportable_Event (Button : Mouse_Button;
  78                                         State  : Button_State;
  79                                         Mask   : in out Event_Mask)
  80    is
  81       Button_Nr : constant Natural := Mouse_Button'Pos (Button);
  82       State_Nr  : constant Natural := Button_State'Pos (State);
  83    begin
  84       if Button in Modifier_Keys and then State /= Pressed then
  85          raise Curses_Exception;
  86       else
  87          if Button in Real_Buttons then
  88             Mask := Mask or ((2 ** (6 * Button_Nr)) ** State_Nr);
  89          else
  90             Mask := Mask or (BUTTON_CTRL ** (Button_Nr - 4));
  91          end if;
  92       end if;
  93    end Register_Reportable_Event;
  94
  95    procedure Register_Reportable_Events (Button : Mouse_Button;
  96                                          State  : Button_States;
  97                                          Mask   : in out Event_Mask)
  98    is
  99    begin
 100       for S in Button_States'Range loop
 101          if State (S) then
 102             Register_Reportable_Event (Button, S, Mask);
 103          end if;
 104       end loop;
 105    end Register_Reportable_Events;
 106
 107    function Start_Mouse (Mask : Event_Mask := All_Events)
 108                          return Event_Mask
 109    is
 110       function MMask (M : Event_Mask;
 111                       O : access Event_Mask) return Event_Mask;
 112       pragma Import (C, MMask, "mousemask");
 113       R   : Event_Mask;
 114       Old : aliased Event_Mask;
 115    begin
 116       R := MMask (Mask, Old'Access);
 117       if R = No_Events then
 118          Beep;
 119       end if;
 120       return Old;
 121    end Start_Mouse;
 122
 123    procedure End_Mouse (Mask : Event_Mask := No_Events)
 124    is
 125    begin
 126       if Mask /= No_Events then
 127          Beep;
 128       end if;
 129    end End_Mouse;
 130
 131    procedure Dispatch_Event (Mask   : Event_Mask;
 132                              Button : out Mouse_Button;
 133                              State  : out Button_State);
 134
 135    procedure Dispatch_Event (Mask   : Event_Mask;
 136                              Button : out Mouse_Button;
 137                              State  : out Button_State) is
 138       L : Event_Mask;
 139    begin
 140       Button := Alt;  --  preset to non real button;
 141       if (Mask and BUTTON1_EVENTS) /= 0 then
 142          Button := Left;
 143       elsif (Mask and BUTTON2_EVENTS) /= 0 then
 144          Button := Middle;
 145       elsif (Mask and BUTTON3_EVENTS) /= 0 then
 146          Button := Right;
 147       elsif (Mask and BUTTON4_EVENTS) /= 0 then
 148          Button := Button4;
 149       end if;
 150       if Button in Real_Buttons then
 151          L := 2 ** (6 * Mouse_Button'Pos (Button));
 152          for I in Button_State'Range loop
 153             if (Mask and L) /= 0 then
 154                State := I;
 155                exit;
 156             end if;
 157             L := 2 * L;
 158          end loop;
 159       else
 160          State := Pressed;
 161          if (Mask and BUTTON_CTRL) /= 0 then
 162             Button := Control;
 163          elsif (Mask and BUTTON_SHIFT) /= 0 then
 164             Button := Shift;
 165          elsif (Mask and BUTTON_ALT) /= 0 then
 166             Button := Alt;
 167          end if;
 168       end if;
 169    end Dispatch_Event;
 170
 171    procedure Get_Event (Event  : Mouse_Event;
 172                         Y      : out Line_Position;
 173                         X      : out Column_Position;
 174                         Button : out Mouse_Button;
 175                         State  : out Button_State)
 176    is
 177       Mask  : constant Event_Mask := Event.Bstate;
 178    begin
 179       X := Column_Position (Event.X);
 180       Y := Line_Position   (Event.Y);
 181       Dispatch_Event (Mask, Button, State);
 182    end Get_Event;
 183
 184    procedure Unget_Mouse (Event : Mouse_Event)
 185    is
 186       function Ungetmouse (Ev : Mouse_Event) return C_Int;
 187       pragma Import (C, Ungetmouse, "ungetmouse");
 188    begin
 189       if Ungetmouse (Event) = Curses_Err then
 190          raise Curses_Exception;
 191       end if;
 192    end Unget_Mouse;
 193
 194    function Enclosed_In_Window (Win    : Window := Standard_Window;
 195                                 Event  : Mouse_Event) return Boolean
 196    is
 197       function Wenclose (Win : Window; Y : C_Int; X : C_Int)
 198                          return Curses_Bool;
 199       pragma Import (C, Wenclose, "wenclose");
 200    begin
 201       if Wenclose (Win, C_Int (Event.Y), C_Int (Event.X))
 202         = Curses_Bool_False
 203       then
 204          return False;
 205       else
 206          return True;
 207       end if;
 208    end Enclosed_In_Window;
 209
 210    function Mouse_Interval (Msec : Natural := 200) return Natural
 211    is
 212       function Mouseinterval (Msec : C_Int) return C_Int;
 213       pragma Import (C, Mouseinterval, "mouseinterval");
 214    begin
 215       return Natural (Mouseinterval (C_Int (Msec)));
 216    end Mouse_Interval;
 217
 218 end Terminal_Interface.Curses.Mouse;