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RmlUi_Platform_X11.cpp
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/*
* This source file is part of RmlUi, the HTML/CSS Interface Middleware
*
* For the latest information, see http://github.com/mikke89/RmlUi
*
* Copyright (c) 2008-2010 CodePoint Ltd, Shift Technology Ltd
* Copyright (c) 2019-2023 The RmlUi Team, and contributors
*
* 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, 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
* AUTHORS OR 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.
*
*/
#include "RmlUi_Platform_X11.h"
#include <RmlUi/Core/Context.h>
#include <RmlUi/Core/Core.h>
#include <RmlUi/Core/Input.h>
#include <RmlUi/Core/Types.h>
#include <X11/cursorfont.h>
#include <X11/extensions/xf86vmode.h>
#include <limits.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>
#ifdef HAS_X11XKBLIB
#include <X11/XKBlib.h>
#endif // HAS_X11XKBLIB
#include <X11/keysym.h>
static Rml::Character GetCharacterCode(Rml::Input::KeyIdentifier key_identifier, int key_modifier_state);
SystemInterface_X11::SystemInterface_X11(Display* display) : display(display)
{
// Create cursors
cursor_default = XCreateFontCursor(display, XC_left_ptr);
cursor_move = XCreateFontCursor(display, XC_fleur);
cursor_pointer = XCreateFontCursor(display, XC_hand1);
cursor_resize = XCreateFontCursor(display, XC_sizing);
cursor_cross = XCreateFontCursor(display, XC_crosshair);
cursor_text = XCreateFontCursor(display, XC_xterm);
cursor_unavailable = XCreateFontCursor(display, XC_X_cursor);
// For copy & paste functions
UTF8_atom = XInternAtom(display, "UTF8_STRING", 1);
XSEL_DATA_atom = XInternAtom(display, "XSEL_DATA", 0);
CLIPBOARD_atom = XInternAtom(display, "CLIPBOARD", 0);
TARGETS_atom = XInternAtom(display, "TARGETS", 0);
TEXT_atom = XInternAtom(display, "TEXT", 0);
gettimeofday(&start_time, nullptr);
}
void SystemInterface_X11::SetWindow(Window in_window)
{
window = in_window;
}
bool SystemInterface_X11::HandleSelectionRequest(const XEvent& ev)
{
if (ev.type == SelectionRequest && XGetSelectionOwner(display, CLIPBOARD_atom) == window && ev.xselectionrequest.selection == CLIPBOARD_atom)
{
XCopy(clipboard_text, ev);
return false;
}
return true;
}
double SystemInterface_X11::GetElapsedTime()
{
struct timeval now;
gettimeofday(&now, nullptr);
double sec = now.tv_sec - start_time.tv_sec;
double usec = now.tv_usec - start_time.tv_usec;
double result = sec + (usec / 1000000.0);
return result;
}
void SystemInterface_X11::SetMouseCursor(const Rml::String& cursor_name)
{
if (display && window)
{
Cursor cursor_handle = 0;
if (cursor_name.empty() || cursor_name == "arrow")
cursor_handle = cursor_default;
else if (cursor_name == "move")
cursor_handle = cursor_move;
else if (cursor_name == "pointer")
cursor_handle = cursor_pointer;
else if (cursor_name == "resize")
cursor_handle = cursor_resize;
else if (cursor_name == "cross")
cursor_handle = cursor_cross;
else if (cursor_name == "text")
cursor_handle = cursor_text;
else if (cursor_name == "rmlui-scroll-idle")
cursor_handle = cursor_move;
else if (cursor_name == "rmlui-scroll-up")
cursor_handle = cursor_move;
else if (cursor_name == "rmlui-scroll-down")
cursor_handle = cursor_move;
else if (cursor_name == "unavailable")
cursor_handle = cursor_unavailable;
if (cursor_handle)
{
XDefineCursor(display, window, cursor_handle);
}
}
}
void SystemInterface_X11::SetClipboardText(const Rml::String& text)
{
clipboard_text = text;
XSetSelectionOwner(display, CLIPBOARD_atom, window, 0);
}
void SystemInterface_X11::GetClipboardText(Rml::String& text)
{
if (XGetSelectionOwner(display, CLIPBOARD_atom) != window)
{
if (!UTF8_atom || !XPaste(UTF8_atom, text))
{
// fallback
XPaste(XA_STRING_atom, text);
}
}
else
{
text = clipboard_text;
}
}
void SystemInterface_X11::XCopy(const Rml::String& clipboard_data, const XEvent& event)
{
Atom format = (UTF8_atom ? UTF8_atom : XA_STRING_atom);
XSelectionEvent ev = {
SelectionNotify, // the event type that will be sent to the requestor
0, // serial
0, // send_event
event.xselectionrequest.display, event.xselectionrequest.requestor, event.xselectionrequest.selection, event.xselectionrequest.target,
event.xselectionrequest.property,
0 // time
};
int retval = 0;
if (ev.target == TARGETS_atom)
{
retval = XChangeProperty(ev.display, ev.requestor, ev.property, XA_atom, 32, PropModeReplace, (unsigned char*)&format, 1);
}
else if (ev.target == XA_STRING_atom || ev.target == TEXT_atom)
{
retval = XChangeProperty(ev.display, ev.requestor, ev.property, XA_STRING_atom, 8, PropModeReplace, (unsigned char*)clipboard_data.c_str(),
clipboard_data.size());
}
else if (ev.target == UTF8_atom)
{
retval = XChangeProperty(ev.display, ev.requestor, ev.property, UTF8_atom, 8, PropModeReplace, (unsigned char*)clipboard_data.c_str(),
clipboard_data.size());
}
else
{
ev.property = 0;
}
if ((retval & 2) == 0)
{
// Notify the requestor that clipboard data is available
XSendEvent(display, ev.requestor, 0, 0, (XEvent*)&ev);
}
}
bool SystemInterface_X11::XPaste(Atom target_atom, Rml::String& clipboard_data)
{
XEvent ev;
// A SelectionRequest event will be sent to the clipboard owner, which should respond with SelectionNotify
XConvertSelection(display, CLIPBOARD_atom, target_atom, XSEL_DATA_atom, window, CurrentTime);
XSync(display, 0);
XNextEvent(display, &ev);
if (ev.type == SelectionNotify)
{
if (ev.xselection.property == 0)
{
// If no owner for the specified selection exists, the X server generates
// a SelectionNotify event with property None (0).
return false;
}
if (ev.xselection.selection == CLIPBOARD_atom)
{
int actual_format;
unsigned long bytes_after, nitems;
char* prop = nullptr;
Atom actual_type;
XGetWindowProperty(ev.xselection.display, ev.xselection.requestor, ev.xselection.property,
0L, // offset
(~0L), // length
0, // delete?
AnyPropertyType, &actual_type, &actual_format, &nitems, &bytes_after, (unsigned char**)&prop);
if (actual_type == UTF8_atom || actual_type == XA_STRING_atom)
{
clipboard_data = Rml::String(prop, prop + nitems);
XFree(prop);
}
XDeleteProperty(ev.xselection.display, ev.xselection.requestor, ev.xselection.property);
return true;
}
}
return false;
}
bool RmlX11::HandleInputEvent(Rml::Context* context, Display* display, const XEvent& ev)
{
switch (ev.type)
{
case ButtonPress:
{
switch (ev.xbutton.button)
{
case Button1:
case Button2:
case Button3: return context->ProcessMouseButtonDown(ConvertMouseButton(ev.xbutton.button), RmlX11::GetKeyModifierState(ev.xbutton.state));
case Button4: return context->ProcessMouseWheel(-1, RmlX11::GetKeyModifierState(ev.xbutton.state));
case Button5: return context->ProcessMouseWheel(1, RmlX11::GetKeyModifierState(ev.xbutton.state));
default: return true;
}
}
break;
case ButtonRelease:
{
switch (ev.xbutton.button)
{
case Button1:
case Button2:
case Button3: return context->ProcessMouseButtonUp(ConvertMouseButton(ev.xbutton.button), RmlX11::GetKeyModifierState(ev.xbutton.state));
default: return true;
}
}
break;
case MotionNotify:
{
return context->ProcessMouseMove(ev.xmotion.x, ev.xmotion.y, RmlX11::GetKeyModifierState(ev.xmotion.state));
}
break;
case LeaveNotify:
{
return context->ProcessMouseLeave();
}
break;
case KeyPress:
{
Rml::Input::KeyIdentifier key_identifier = RmlX11::ConvertKey(display, ev.xkey.keycode);
const int key_modifier_state = RmlX11::GetKeyModifierState(ev.xkey.state);
bool propagates = true;
if (key_identifier != Rml::Input::KI_UNKNOWN)
propagates = context->ProcessKeyDown(key_identifier, key_modifier_state);
Rml::Character character = GetCharacterCode(key_identifier, key_modifier_state);
if (character != Rml::Character::Null && !(key_modifier_state & Rml::Input::KM_CTRL))
propagates &= context->ProcessTextInput(character);
return propagates;
}
break;
case KeyRelease:
{
Rml::Input::KeyIdentifier key_identifier = RmlX11::ConvertKey(display, ev.xkey.keycode);
const int key_modifier_state = RmlX11::GetKeyModifierState(ev.xkey.state);
bool propagates = true;
if (key_identifier != Rml::Input::KI_UNKNOWN)
propagates = context->ProcessKeyUp(key_identifier, key_modifier_state);
return propagates;
}
break;
default: break;
}
return true;
}
int RmlX11::GetKeyModifierState(int x11_state)
{
int key_modifier_state = 0;
if (x11_state & ShiftMask)
key_modifier_state |= Rml::Input::KM_SHIFT;
if (x11_state & LockMask)
key_modifier_state |= Rml::Input::KM_CAPSLOCK;
if (x11_state & ControlMask)
key_modifier_state |= Rml::Input::KM_CTRL;
if (x11_state & Mod5Mask)
key_modifier_state |= Rml::Input::KM_ALT;
if (x11_state & Mod2Mask)
key_modifier_state |= Rml::Input::KM_NUMLOCK;
return key_modifier_state;
}
/**
X11 Key data used for key code conversion.
*/
struct XKeyData {
#ifdef HAS_X11XKBLIB
bool has_xkblib = false;
#endif // HAS_X11XKBLIB
bool initialized = false;
int min_keycode = 0, max_keycode = 0, keysyms_per_keycode = 0;
KeySym* x11_key_mapping = nullptr;
};
// Get the key data, which is initialized and filled on the first fetch.
static const XKeyData& GetXKeyData(Display* display)
{
RMLUI_ASSERT(display);
static XKeyData data;
if (!data.initialized)
{
data.initialized = true;
#ifdef HAS_X11XKBLIB
int opcode_rtrn = -1;
int event_rtrn = -1;
int error_rtrn = -1;
int major_in_out = -1;
int minor_in_out = -1;
// Xkb extension may not exist in the server. This checks for its existence and initializes the extension if available.
data.has_xkblib = XkbQueryExtension(display, &opcode_rtrn, &event_rtrn, &error_rtrn, &major_in_out, &minor_in_out);
// if Xkb isn't available, fall back to using XGetKeyboardMapping, which may occur if RmlUi is compiled with Xkb support but the server
// doesn't support it. This occurs with older X11 servers or virtual framebuffers such as x11vnc server.
if (!data.has_xkblib)
#endif // HAS_X11XKBLIB
{
XDisplayKeycodes(display, &data.min_keycode, &data.max_keycode);
data.x11_key_mapping = XGetKeyboardMapping(display, data.min_keycode, data.max_keycode + 1 - data.min_keycode, &data.keysyms_per_keycode);
}
}
return data;
}
Rml::Input::KeyIdentifier RmlX11::ConvertKey(Display* display, unsigned int x11_key_code)
{
RMLUI_ASSERT(display);
const XKeyData& key_data = GetXKeyData(display);
const int group_index = 0; // this is always 0 for our limited example
KeySym sym = {};
#ifdef HAS_X11XKBLIB
if (key_data.has_xkblib)
{
sym = XkbKeycodeToKeysym(display, x11_key_code, 0, group_index);
}
else
#endif // HAS_X11XKBLIB
{
KeySym sym_full = key_data.x11_key_mapping[(x11_key_code - key_data.min_keycode) * key_data.keysyms_per_keycode + group_index];
KeySym lower_sym, upper_sym;
XConvertCase(sym_full, &lower_sym, &upper_sym);
sym = lower_sym;
}
// clang-format off
switch (sym & 0xFF)
{
case XK_BackSpace & 0xFF: return Rml::Input::KI_BACK;
case XK_Tab & 0xFF: return Rml::Input::KI_TAB;
case XK_Clear & 0xFF: return Rml::Input::KI_CLEAR;
case XK_Return & 0xFF: return Rml::Input::KI_RETURN;
case XK_Pause & 0xFF: return Rml::Input::KI_PAUSE;
case XK_Scroll_Lock & 0xFF: return Rml::Input::KI_SCROLL;
case XK_Escape & 0xFF: return Rml::Input::KI_ESCAPE;
case XK_Delete & 0xFF: return Rml::Input::KI_DELETE;
case XK_Kanji & 0xFF: return Rml::Input::KI_KANJI;
// case XK_Muhenkan & 0xFF: return Rml::Input::; /* Cancel Conversion */
// case XK_Henkan_Mode & 0xFF: return Rml::Input::; /* Start/Stop Conversion */
// case XK_Henkan & 0xFF: return Rml::Input::; /* Alias for Henkan_Mode */
// case XK_Romaji & 0xFF: return Rml::Input::; /* to Romaji */
// case XK_Hiragana & 0xFF: return Rml::Input::; /* to Hiragana */
// case XK_Katakana & 0xFF: return Rml::Input::; /* to Katakana */
// case XK_Hiragana_Katakana & 0xFF: return Rml::Input::; /* Hiragana/Katakana toggle */
// case XK_Zenkaku & 0xFF: return Rml::Input::; /* to Zenkaku */
// case XK_Hankaku & 0xFF: return Rml::Input::; /* to Hankaku */
// case XK_Zenkaku_Hankaku & 0xFF: return Rml::Input::; /* Zenkaku/Hankaku toggle */
case XK_Touroku & 0xFF: return Rml::Input::KI_OEM_FJ_TOUROKU;
// case XK_Massyo & 0xFF: return Rml::Input::KI_OEM_FJ_MASSHOU;
// case XK_Kana_Lock & 0xFF: return Rml::Input::; /* Kana Lock */
// case XK_Kana_Shift & 0xFF: return Rml::Input::; /* Kana Shift */
// case XK_Eisu_Shift & 0xFF: return Rml::Input::; /* Alphanumeric Shift */
// case XK_Eisu_toggle & 0xFF: return Rml::Input::; /* Alphanumeric toggle */
case XK_Home & 0xFF: return Rml::Input::KI_HOME;
case XK_Left & 0xFF: return Rml::Input::KI_LEFT;
case XK_Up & 0xFF: return Rml::Input::KI_UP;
case XK_Right & 0xFF: return Rml::Input::KI_RIGHT;
case XK_Down & 0xFF: return Rml::Input::KI_DOWN;
case XK_Prior & 0xFF: return Rml::Input::KI_PRIOR;
case XK_Next & 0xFF: return Rml::Input::KI_NEXT;
case XK_End & 0xFF: return Rml::Input::KI_END;
case XK_Begin & 0xFF: return Rml::Input::KI_HOME;
// case XK_Print & 0xFF: return Rml::Input::KI_SNAPSHOT;
// case XK_Insert & 0xFF: return Rml::Input::KI_INSERT;
case XK_Num_Lock & 0xFF: return Rml::Input::KI_NUMLOCK;
case XK_KP_Space & 0xFF: return Rml::Input::KI_SPACE;
case XK_KP_Tab & 0xFF: return Rml::Input::KI_TAB;
case XK_KP_Enter & 0xFF: return Rml::Input::KI_NUMPADENTER;
case XK_KP_F1 & 0xFF: return Rml::Input::KI_F1;
case XK_KP_F2 & 0xFF: return Rml::Input::KI_F2;
case XK_KP_F3 & 0xFF: return Rml::Input::KI_F3;
case XK_KP_F4 & 0xFF: return Rml::Input::KI_F4;
case XK_KP_Home & 0xFF: return Rml::Input::KI_NUMPAD7;
case XK_KP_Left & 0xFF: return Rml::Input::KI_NUMPAD4;
case XK_KP_Up & 0xFF: return Rml::Input::KI_NUMPAD8;
case XK_KP_Right & 0xFF: return Rml::Input::KI_NUMPAD6;
case XK_KP_Down & 0xFF: return Rml::Input::KI_NUMPAD2;
case XK_KP_Prior & 0xFF: return Rml::Input::KI_NUMPAD9;
case XK_KP_Next & 0xFF: return Rml::Input::KI_NUMPAD3;
case XK_KP_End & 0xFF: return Rml::Input::KI_NUMPAD1;
case XK_KP_Begin & 0xFF: return Rml::Input::KI_NUMPAD5;
case XK_KP_Insert & 0xFF: return Rml::Input::KI_NUMPAD0;
case XK_KP_Delete & 0xFF: return Rml::Input::KI_DECIMAL;
case XK_KP_Equal & 0xFF: return Rml::Input::KI_OEM_NEC_EQUAL;
case XK_KP_Multiply & 0xFF: return Rml::Input::KI_MULTIPLY;
case XK_KP_Add & 0xFF: return Rml::Input::KI_ADD;
case XK_KP_Separator & 0xFF: return Rml::Input::KI_SEPARATOR;
case XK_KP_Subtract & 0xFF: return Rml::Input::KI_SUBTRACT;
case XK_KP_Decimal & 0xFF: return Rml::Input::KI_DECIMAL;
case XK_KP_Divide & 0xFF: return Rml::Input::KI_DIVIDE;
case XK_F1 & 0xFF: return Rml::Input::KI_F1;
case XK_F2 & 0xFF: return Rml::Input::KI_F2;
case XK_F3 & 0xFF: return Rml::Input::KI_F3;
case XK_F4 & 0xFF: return Rml::Input::KI_F4;
case XK_F5 & 0xFF: return Rml::Input::KI_F5;
case XK_F6 & 0xFF: return Rml::Input::KI_F6;
case XK_F7 & 0xFF: return Rml::Input::KI_F7;
case XK_F8 & 0xFF: return Rml::Input::KI_F8;
case XK_F9 & 0xFF: return Rml::Input::KI_F9;
case XK_F10 & 0xFF: return Rml::Input::KI_F10;
case XK_F11 & 0xFF: return Rml::Input::KI_F11;
case XK_F12 & 0xFF: return Rml::Input::KI_F12;
case XK_F13 & 0xFF: return Rml::Input::KI_F13;
case XK_F14 & 0xFF: return Rml::Input::KI_F14;
case XK_F15 & 0xFF: return Rml::Input::KI_F15;
case XK_F16 & 0xFF: return Rml::Input::KI_F16;
case XK_F17 & 0xFF: return Rml::Input::KI_F17;
case XK_F18 & 0xFF: return Rml::Input::KI_F18;
case XK_F19 & 0xFF: return Rml::Input::KI_F19;
case XK_F20 & 0xFF: return Rml::Input::KI_F20;
case XK_F21 & 0xFF: return Rml::Input::KI_F21;
case XK_F22 & 0xFF: return Rml::Input::KI_F22;
case XK_F23 & 0xFF: return Rml::Input::KI_F23;
case XK_F24 & 0xFF: return Rml::Input::KI_F24;
case XK_Shift_L & 0xFF: return Rml::Input::KI_LSHIFT;
case XK_Shift_R & 0xFF: return Rml::Input::KI_RSHIFT;
case XK_Control_L & 0xFF: return Rml::Input::KI_LCONTROL;
case XK_Control_R & 0xFF: return Rml::Input::KI_RCONTROL;
case XK_Caps_Lock & 0xFF: return Rml::Input::KI_CAPITAL;
case XK_Alt_L & 0xFF: return Rml::Input::KI_LMENU;
case XK_Alt_R & 0xFF: return Rml::Input::KI_RMENU;
case XK_space & 0xFF: return Rml::Input::KI_SPACE;
case XK_apostrophe & 0xFF: return Rml::Input::KI_OEM_7;
case XK_comma & 0xFF: return Rml::Input::KI_OEM_COMMA;
case XK_minus & 0xFF: return Rml::Input::KI_OEM_MINUS;
case XK_period & 0xFF: return Rml::Input::KI_OEM_PERIOD;
case XK_slash & 0xFF: return Rml::Input::KI_OEM_2;
case XK_0 & 0xFF: return Rml::Input::KI_0;
case XK_1 & 0xFF: return Rml::Input::KI_1;
case XK_2 & 0xFF: return Rml::Input::KI_2;
case XK_3 & 0xFF: return Rml::Input::KI_3;
case XK_4 & 0xFF: return Rml::Input::KI_4;
case XK_5 & 0xFF: return Rml::Input::KI_5;
case XK_6 & 0xFF: return Rml::Input::KI_6;
case XK_7 & 0xFF: return Rml::Input::KI_7;
case XK_8 & 0xFF: return Rml::Input::KI_8;
case XK_9 & 0xFF: return Rml::Input::KI_9;
case XK_semicolon & 0xFF: return Rml::Input::KI_OEM_1;
case XK_equal & 0xFF: return Rml::Input::KI_OEM_PLUS;
case XK_bracketleft & 0xFF: return Rml::Input::KI_OEM_4;
case XK_backslash & 0xFF: return Rml::Input::KI_OEM_5;
case XK_bracketright & 0xFF: return Rml::Input::KI_OEM_6;
case XK_grave & 0xFF: return Rml::Input::KI_OEM_3;
case XK_a & 0xFF: return Rml::Input::KI_A;
case XK_b & 0xFF: return Rml::Input::KI_B;
case XK_c & 0xFF: return Rml::Input::KI_C;
case XK_d & 0xFF: return Rml::Input::KI_D;
case XK_e & 0xFF: return Rml::Input::KI_E;
case XK_f & 0xFF: return Rml::Input::KI_F;
case XK_g & 0xFF: return Rml::Input::KI_G;
case XK_h & 0xFF: return Rml::Input::KI_H;
case XK_i & 0xFF: return Rml::Input::KI_I;
case XK_j & 0xFF: return Rml::Input::KI_J;
case XK_k & 0xFF: return Rml::Input::KI_K;
case XK_l & 0xFF: return Rml::Input::KI_L;
case XK_m & 0xFF: return Rml::Input::KI_M;
case XK_n & 0xFF: return Rml::Input::KI_N;
case XK_o & 0xFF: return Rml::Input::KI_O;
case XK_p & 0xFF: return Rml::Input::KI_P;
case XK_q & 0xFF: return Rml::Input::KI_Q;
case XK_r & 0xFF: return Rml::Input::KI_R;
case XK_s & 0xFF: return Rml::Input::KI_S;
case XK_t & 0xFF: return Rml::Input::KI_T;
case XK_u & 0xFF: return Rml::Input::KI_U;
case XK_v & 0xFF: return Rml::Input::KI_V;
case XK_w & 0xFF: return Rml::Input::KI_W;
case XK_x & 0xFF: return Rml::Input::KI_X;
case XK_y & 0xFF: return Rml::Input::KI_Y;
case XK_z & 0xFF: return Rml::Input::KI_Z;
default: break;
}
// clang-format on
return Rml::Input::KI_UNKNOWN;
}
int RmlX11::ConvertMouseButton(unsigned int x11_mouse_button)
{
switch (x11_mouse_button)
{
case Button1: return 0;
case Button2: return 2;
case Button3: return 1;
default: break;
}
return 0;
}
/**
This map contains 4 different mappings from key identifiers to character codes. Each entry represents a different
combination of shift and capslock state.
*/
static char ascii_map[4][51] = {
// shift off and capslock off
{0, ' ', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', ';', '=', ',', '-', '.', '/', '`', '[', '\\', ']', '\'', 0, 0},
// shift on and capslock off
{0, ' ', ')', '!', '@', '#', '$', '%', '^', '&', '*', '(', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q',
'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', ':', '+', '<', '_', '>', '?', '~', '{', '|', '}', '"', 0, 0},
// shift on and capslock on
{0, ' ', ')', '!', '@', '#', '$', '%', '^', '&', '*', '(', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', ':', '+', '<', '_', '>', '?', '~', '{', '|', '}', '"', 0, 0},
// shift off and capslock on
{0, ' ', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q',
'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', ';', '=', ',', '-', '.', '/', '`', '[', '\\', ']', '\'', 0, 0}};
static char keypad_map[2][18] = {{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '\n', '*', '+', 0, '-', '.', '/', '='},
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, '\n', '*', '+', 0, '-', 0, '/', '='}};
// Returns the character code for a key identifer / key modifier combination.
static Rml::Character GetCharacterCode(Rml::Input::KeyIdentifier key_identifier, int key_modifier_state)
{
using Rml::Character;
// Check if we have a keycode capable of generating characters on the main keyboard (ie, not on the numeric
// keypad; that is dealt with below).
if (key_identifier <= Rml::Input::KI_OEM_102)
{
// Get modifier states
bool shift = (key_modifier_state & Rml::Input::KM_SHIFT) > 0;
bool capslock = (key_modifier_state & Rml::Input::KM_CAPSLOCK) > 0;
// Return character code based on identifier and modifiers
if (shift && !capslock)
return (Character)ascii_map[1][key_identifier];
if (shift && capslock)
return (Character)ascii_map[2][key_identifier];
if (!shift && capslock)
return (Character)ascii_map[3][key_identifier];
return (Character)ascii_map[0][key_identifier];
}
// Check if we have a keycode from the numeric keypad.
else if (key_identifier <= Rml::Input::KI_OEM_NEC_EQUAL)
{
if (key_modifier_state & Rml::Input::KM_NUMLOCK)
return (Character)keypad_map[0][key_identifier - Rml::Input::KI_NUMPAD0];
else
return (Character)keypad_map[1][key_identifier - Rml::Input::KI_NUMPAD0];
}
else if (key_identifier == Rml::Input::KI_RETURN)
return (Character)'\n';
return Character::Null;
}