{ XKeyInput

  Copyright (C) 2008 Tom Gregorovic

  This source is free software; you can redistribute it and/or modify it under the terms of the
  GNU General Public License as published by the Free Software Foundation; either version 2 of the
  License, or (at your option) any later version.

  This code is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
  even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  General Public License for more details.

  A copy of the GNU General Public License is available on the World Wide Web at
  <http://www.gnu.org/copyleft/gpl.html>. You can also obtain it by writing to the Free Software
  Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1335, USA.
}
unit XKeyInput;

{$mode objfpc}{$H+}
{$linklib Xtst}

interface

uses
  Classes, SysUtils, Controls, Forms,
  X, XLib, KeySym,
  KeyInputIntf;
  
type

  { TXKeyInput }

  TXKeyInput = class(TKeyInput)
  protected
    procedure DoDown(Key: Word); override;
    procedure DoUp(Key: Word); override;
  end;
  
function InitializeKeyInput: TKeyInput;

function XTestFakeKeyEvent(dpy: PDisplay; keycode: dword; is_press: Boolean;
  delay: dword): longint; cdecl; external;

implementation

uses LCLType;

function InitializeKeyInput: TKeyInput;
begin
  Result := TXKeyInput.Create;
end;

function VirtualKeyToXKeySym(Key: Word): TKeySym;
begin
  case Key of
    VK_BACK: Result := XK_BackSpace;
    VK_TAB: Result := XK_Tab;
    VK_CLEAR: Result := XK_Clear;
    VK_RETURN: Result := XK_Return;
    VK_SHIFT: Result := XK_Shift_L;
    VK_CONTROL: Result := XK_Control_L;
    VK_MENU: Result := XK_VoidSymbol; // alt key crashes app, XK_Alt_R;
    VK_CAPITAL: Result := XK_Caps_Lock;

    VK_ESCAPE: Result := XK_Escape;
    VK_SPACE: Result := XK_space;
    VK_PRIOR: Result := XK_Prior;
    VK_NEXT: Result := XK_Next;
    VK_END: Result := XK_End;
    VK_HOME: Result := XK_Home;
    VK_LEFT: Result := XK_Left;
    VK_UP: Result := XK_Up;
    VK_RIGHT: Result := XK_Right;
    VK_DOWN: Result := XK_Down;
    VK_SELECT: Result := XK_Select;
    VK_PRINT: Result := XK_Print;
    VK_EXECUTE: Result := XK_Execute;

    VK_INSERT: Result := XK_Insert;
    VK_DELETE: Result := XK_Delete;
    VK_HELP: Result := XK_Help;
    VK_0: Result := XK_0;
    VK_1: Result := XK_1;
    VK_2: Result := XK_2;
    VK_3: Result := XK_3;
    VK_4: Result := XK_4;
    VK_5: Result := XK_5;
    VK_6: Result := XK_6;
    VK_7: Result := XK_7;
    VK_8: Result := XK_8;
    VK_9: Result := XK_9;

    VK_A: Result := XK_a;
    VK_B: Result := XK_b;
    VK_C: Result := XK_c;
    VK_D: Result := XK_d;
    VK_E: Result := XK_e;
    VK_F: Result := XK_f;
    VK_G: Result := XK_g;
    VK_H: Result := XK_h;
    VK_I: Result := XK_i;
    VK_J: Result := XK_j;
    VK_K: Result := XK_k;
    VK_L: Result := XK_l;
    VK_M: Result := XK_m;
    VK_N: Result := XK_n;
    VK_O: Result := XK_o;
    VK_P: Result := XK_p;
    VK_Q: Result := XK_q;
    VK_R: Result := XK_r;
    VK_S: Result := XK_s;
    VK_T: Result := XK_t;
    VK_U: Result := XK_u;
    VK_V: Result := XK_v;
    VK_W: Result := XK_w;
    VK_X: Result := XK_x;
    VK_Y: Result := XK_y;
    VK_Z: Result := XK_z;

    VK_NUMPAD0: Result := XK_KP_0;
    VK_NUMPAD1: Result := XK_KP_1;
    VK_NUMPAD2: Result := XK_KP_2;
    VK_NUMPAD3: Result := XK_KP_3;
    VK_NUMPAD4: Result := XK_KP_4;
    VK_NUMPAD5: Result := XK_KP_5;
    VK_NUMPAD6: Result := XK_KP_6;
    VK_NUMPAD7: Result := XK_KP_7;
    VK_NUMPAD8: Result := XK_KP_8;
    VK_NUMPAD9: Result := XK_KP_9;
    VK_MULTIPLY: Result := XK_KP_Multiply;
    VK_ADD: Result := XK_KP_Add;
    VK_SEPARATOR: Result := XK_KP_Separator;
    VK_SUBTRACT: Result := XK_KP_Subtract;
    VK_DECIMAL: Result := XK_KP_Decimal;
    VK_DIVIDE: Result := XK_KP_Divide;
    VK_F1: Result := XK_F1;
    VK_F2: Result := XK_F2;
    VK_F3: Result := XK_F3;
    VK_F4: Result := XK_F4;
    VK_F5: Result := XK_F5;
    VK_F6: Result := XK_F6;
    VK_F7: Result := XK_F7;
    VK_F8: Result := XK_F8;
    VK_F9: Result := XK_F9;
    VK_F10: Result := XK_F10;
    VK_F11: Result := XK_F11;
    VK_F12: Result := XK_F12;
    VK_F13: Result := XK_F13;
    VK_F14: Result := XK_F14;
    VK_F15: Result := XK_F15;
    VK_F16: Result := XK_F16;
    VK_F17: Result := XK_F17;
    VK_F18: Result := XK_F18;
    VK_F19: Result := XK_F19;
    VK_F20: Result := XK_F20;
    VK_F21: Result := XK_F21;
    VK_F22: Result := XK_F22;
    VK_F23: Result := XK_F23;
    VK_F24: Result := XK_F24;
    VK_NUMLOCK: Result := XK_Num_Lock;
    VK_SCROLL: Result := XK_Scroll_Lock;
  else
    Result := XK_VoidSymbol;
  end;
end;

{ TXKeyInput }

procedure TXKeyInput.DoDown(Key: Word);
var
  Display: PDisplay;
  KeySym: TKeySym;
begin
  KeySym := VirtualKeyToXKeySym(Key);
  if KeySym = XK_VoidSymbol then Exit;
  
  Display := XOpenDisplay(nil);
  XTestFakeKeyEvent(Display, XKeysymToKeycode(Display, KeySym), True, 0);
  XFlush(Display);
  XCloseDisplay(Display);
end;

procedure TXKeyInput.DoUp(Key: Word);
var
  Display: PDisplay;
  KeySym: TKeySym;
begin
  KeySym := VirtualKeyToXKeySym(Key);
  if KeySym = XK_VoidSymbol then Exit;
  
  Display := XOpenDisplay(nil);
  XTestFakeKeyEvent(Display, XKeysymToKeycode(Display, KeySym), False, 0);
  XFlush(Display);
  XCloseDisplay(Display);
end;

end.