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#include "cru/platform/gui/xcb/Keyboard.h"
#include "cru/platform/gui/Keyboard.h"
#include "cru/platform/gui/xcb/UiApplication.h"
#include <xcb/xcb.h>
#include <bitset>
#include <climits>
#include <unordered_map>
#include <utility>
namespace cru::platform::gui::xcb {
// Refer to
// https://www.x.org/releases/X11R7.7/doc/xproto/x11protocol.html#keysym_encoding
KeyCode XorgKeysymToKeyCode(xcb_keysym_t keysym) {
if (keysym >= 'A' && keysym <= 'Z') {
return KeyCode(static_cast<int>(KeyCode::A) + (keysym - 'A'));
}
if (keysym >= 'a' && keysym <= 'z') {
return KeyCode(static_cast<int>(KeyCode::A) + (keysym - 'a'));
}
if (keysym >= '0' && keysym <= '9') {
return KeyCode(static_cast<int>(KeyCode::N0) + (keysym - '0'));
}
if (keysym >= 0xFFB0 && keysym <= 0xFFB9) {
return KeyCode(static_cast<int>(KeyCode::NumPad0) + (keysym - 0xFFB0));
}
if (keysym >= 0xFFBE && keysym <= 0xFFC9) {
return KeyCode(static_cast<int>(KeyCode::F1) + (keysym - 0xFFBE));
}
switch (keysym) {
#define CRU_DEFINE_KEYCODE_MAP(keysym, cru) \
case keysym: \
return cru;
CRU_DEFINE_KEYCODE_MAP(',', KeyCode::Comma)
CRU_DEFINE_KEYCODE_MAP('.', KeyCode::Period)
CRU_DEFINE_KEYCODE_MAP('/', KeyCode::Slash)
CRU_DEFINE_KEYCODE_MAP(';', KeyCode::Semicolon)
CRU_DEFINE_KEYCODE_MAP('\'', KeyCode::Quote)
CRU_DEFINE_KEYCODE_MAP('{', KeyCode::LeftSquareBracket)
CRU_DEFINE_KEYCODE_MAP('}', KeyCode::RightSquareBracket)
CRU_DEFINE_KEYCODE_MAP('-', KeyCode::Minus)
CRU_DEFINE_KEYCODE_MAP('=', KeyCode::Equal)
CRU_DEFINE_KEYCODE_MAP('\\', KeyCode::BackSlash)
CRU_DEFINE_KEYCODE_MAP(0xFF1B, KeyCode::Escape)
CRU_DEFINE_KEYCODE_MAP(0xFF09, KeyCode::Tab)
CRU_DEFINE_KEYCODE_MAP(0xFFE5, KeyCode::CapsLock)
CRU_DEFINE_KEYCODE_MAP(0xFFE1, KeyCode::LeftShift)
CRU_DEFINE_KEYCODE_MAP(0xFFE2, KeyCode::RightShift)
CRU_DEFINE_KEYCODE_MAP(0xFFE3, KeyCode::LeftCtrl)
CRU_DEFINE_KEYCODE_MAP(0xFFE4, KeyCode::RightCtrl)
CRU_DEFINE_KEYCODE_MAP(0xFFE9, KeyCode::LeftAlt)
CRU_DEFINE_KEYCODE_MAP(0xFFEA, KeyCode::RightAlt)
CRU_DEFINE_KEYCODE_MAP(0xFF08, KeyCode::Backspace)
CRU_DEFINE_KEYCODE_MAP(0xFF0D, KeyCode::Return)
CRU_DEFINE_KEYCODE_MAP(0xFFFF, KeyCode::Delete)
CRU_DEFINE_KEYCODE_MAP(0xFF50, KeyCode::Home)
CRU_DEFINE_KEYCODE_MAP(0xFF57, KeyCode::End)
CRU_DEFINE_KEYCODE_MAP(0xFF55, KeyCode::PageUp)
CRU_DEFINE_KEYCODE_MAP(0xFF56, KeyCode::PageDown)
CRU_DEFINE_KEYCODE_MAP(0xFF51, KeyCode::Left)
CRU_DEFINE_KEYCODE_MAP(0xFF53, KeyCode::Right)
CRU_DEFINE_KEYCODE_MAP(0xFF52, KeyCode::Up)
CRU_DEFINE_KEYCODE_MAP(0xFF54, KeyCode::Down)
CRU_DEFINE_KEYCODE_MAP(' ', KeyCode::Space)
default:
return KeyCode::Unknown;
}
}
KeyCode XorgKeycodeToCruKeyCode(XcbUiApplication *application,
xcb_keycode_t keycode) {
auto connection = application->GetXcbConnection();
auto setup = xcb_get_setup(connection);
auto min_keycode = setup->min_keycode;
auto max_keycode = setup->max_keycode;
// Get keyboard mapping
auto mapping_cookie = xcb_get_keyboard_mapping(connection, keycode, 1);
auto *mapping_reply =
xcb_get_keyboard_mapping_reply(connection, mapping_cookie, NULL);
if (!mapping_reply) {
throw XcbException("Cannot get keyboard mapping.");
}
auto keysyms_per_keycode = mapping_reply->keysyms_per_keycode;
auto *keysyms = xcb_get_keyboard_mapping_keysyms(mapping_reply);
for (int i = 0; i < keysyms_per_keycode; i++) {
auto result = XorgKeysymToKeyCode(keysyms[i]);
if (result != KeyCode::Unknown) return result;
}
return KeyCode::Unknown;
}
namespace {
using KeymapBitset =
std::bitset<sizeof(std::declval<xcb_query_keymap_reply_t>().keys) *
CHAR_BIT>;
KeymapBitset GetXorgKeymap(xcb_connection_t *connection) {
auto keymap_cookie = xcb_query_keymap(connection);
auto keymap_reply = xcb_query_keymap_reply(connection, keymap_cookie, NULL);
if (!keymap_reply) {
throw XcbException("Cannot get keymap.");
}
KeymapBitset result;
int counter = 0;
for (auto member : keymap_reply->keys) {
for (int i = 0; i < sizeof(member); i++) {
result[counter] = member & (1 << i);
counter++;
}
}
return result;
}
} // namespace
std::unordered_map<KeyCode, bool> GetKeyboardState(
XcbUiApplication *application) {
auto connection = application->GetXcbConnection();
auto setup = xcb_get_setup(connection);
auto min_keycode = setup->min_keycode;
auto max_keycode = setup->max_keycode;
// Get keyboard mapping
auto mapping_cookie = xcb_get_keyboard_mapping(connection, min_keycode,
max_keycode - min_keycode + 1);
auto *mapping_reply =
xcb_get_keyboard_mapping_reply(connection, mapping_cookie, NULL);
if (!mapping_reply) {
throw XcbException("Cannot get keyboard mapping.");
}
auto keysyms_per_keycode = mapping_reply->keysyms_per_keycode;
auto *keysyms = xcb_get_keyboard_mapping_keysyms(mapping_reply);
auto keymap = GetXorgKeymap(connection);
std::unordered_map<KeyCode, bool> result;
for (xcb_keycode_t i = min_keycode; i <= max_keycode; i++) {
auto keysyms_for_this = keysyms + (i - min_keycode) * keysyms_per_keycode;
for (int j = 0; j < keysyms_per_keycode; j++) {
auto keycode = XorgKeysymToKeyCode(keysyms_for_this[j]);
if (keycode != KeyCode::Unknown) {
result[keycode] = keymap[i];
}
}
}
return result;
}
// Though X provides GetModifierMapping, it cannot get ALT state.
KeyModifier GetCurrentKeyModifiers(XcbUiApplication *application) {
KeyModifier result{};
auto state = GetKeyboardState(application);
if (state[KeyCode::LeftShift] || state[KeyCode::RightShift]) {
result |= KeyModifiers::Shift;
}
if (state[KeyCode::LeftCtrl] || state[KeyCode::RightCtrl]) {
result |= KeyModifiers::Ctrl;
}
if (state[KeyCode::LeftAlt] || state[KeyCode::RightAlt]) {
result |= KeyModifiers::Alt;
}
return result;
}
} // namespace cru::platform::gui::xcb
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