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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "remoting/host/linux/x11_keyboard_impl.h"
#include <X11/extensions/XInput.h>
#include <X11/extensions/XTest.h>
#include <X11/XKBlib.h>
#include "base/strings/stringprintf.h"
#include "remoting/host/linux/unicode_to_keysym.h"
#include "ui/gfx/x/x11_types.h"
namespace {
bool FindKeycodeForKeySym(Display* display,
KeySym key_sym,
uint32_t* keycode,
uint32_t* modifiers) {
uint32_t found_keycode = XKeysymToKeycode(display, key_sym);
const uint32_t kModifiersToTry[] = {
0,
ShiftMask,
Mod2Mask,
Mod3Mask,
Mod4Mask,
ShiftMask | Mod2Mask,
ShiftMask | Mod3Mask,
ShiftMask | Mod4Mask,
};
// TODO(sergeyu): Is there a better way to find modifiers state?
for (size_t i = 0; i < arraysize(kModifiersToTry); ++i) {
unsigned long key_sym_with_mods;
if (XkbLookupKeySym(display, found_keycode, kModifiersToTry[i], nullptr,
&key_sym_with_mods) &&
key_sym_with_mods == key_sym) {
*modifiers = kModifiersToTry[i];
*keycode = found_keycode;
return true;
}
}
return false;
}
} // namespace
namespace remoting {
X11KeyboardImpl::X11KeyboardImpl(Display* display) : display_(display) {}
X11KeyboardImpl::~X11KeyboardImpl() {}
std::vector<uint32_t> X11KeyboardImpl::GetUnusedKeycodes() {
std::vector<uint32_t> unused_keycodes_;
int min_keycode;
int max_keycode;
XDisplayKeycodes(display_, &min_keycode, &max_keycode);
uint32_t keycode_count = max_keycode - min_keycode + 1;
int sym_per_key;
gfx::XScopedPtr<KeySym> mapping(
XGetKeyboardMapping(display_, min_keycode, keycode_count, &sym_per_key));
for (int keycode = max_keycode; keycode >= min_keycode; keycode--) {
bool used = false;
int offset = (keycode - min_keycode) * sym_per_key;
for (int level = 0; level < sym_per_key; level++) {
if (mapping.get()[offset + level]) {
used = true;
break;
}
}
if (!used) {
unused_keycodes_.push_back(keycode);
}
}
return unused_keycodes_;
}
void X11KeyboardImpl::PressKey(uint32_t keycode, uint32_t modifiers) {
XkbLockModifiers(display_, XkbUseCoreKbd, modifiers, modifiers);
XTestFakeKeyEvent(display_, keycode, True, CurrentTime);
XTestFakeKeyEvent(display_, keycode, False, CurrentTime);
XkbLockModifiers(display_, XkbUseCoreKbd, modifiers, 0);
}
bool X11KeyboardImpl::FindKeycode(uint32_t code_point,
uint32_t* keycode,
uint32_t* modifiers) {
for (uint32_t keysym : GetKeySymsForUnicode(code_point)) {
if (FindKeycodeForKeySym(display_, keysym, keycode, modifiers)) {
return true;
}
}
return false;
}
bool X11KeyboardImpl::ChangeKeyMapping(uint32_t keycode, uint32_t code_point) {
KeySym sym = NoSymbol;
if (code_point > 0) {
std::string sym_hex = base::StringPrintf("U%x", code_point);
sym = XStringToKeysym(sym_hex.c_str());
if (sym == NoSymbol) {
// The server may not support Unicode-to-KeySym translation.
return false;
}
}
KeySym syms[2]{sym, sym}; // {lower-case, upper-case}
XChangeKeyboardMapping(display_, keycode, 2, syms, 1);
return true;
}
void X11KeyboardImpl::Flush() {
XFlush(display_);
}
void X11KeyboardImpl::Sync() {
XSync(display_, false);
}
} // namespace remoting
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