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// Copyright 2013 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 "ash/wm/sticky_keys.h"
#include <X11/Xlib.h>
#undef RootWindow
#include "base/basictypes.h"
#include "base/debug/stack_trace.h"
#include "ui/aura/root_window.h"
#include "ui/events/event.h"
#include "ui/events/keycodes/keyboard_code_conversion.h"
namespace ash {
namespace {
// An implementation of StickyKeysHandler::StickyKeysHandlerDelegate.
class StickyKeysHandlerDelegateImpl :
public StickyKeysHandler::StickyKeysHandlerDelegate {
public:
StickyKeysHandlerDelegateImpl();
virtual ~StickyKeysHandlerDelegateImpl();
// StickyKeysHandlerDelegate overrides.
virtual void DispatchKeyEvent(ui::KeyEvent* event,
aura::Window* target) OVERRIDE;
private:
DISALLOW_COPY_AND_ASSIGN(StickyKeysHandlerDelegateImpl);
};
StickyKeysHandlerDelegateImpl::StickyKeysHandlerDelegateImpl() {
}
StickyKeysHandlerDelegateImpl::~StickyKeysHandlerDelegateImpl() {
}
void StickyKeysHandlerDelegateImpl::DispatchKeyEvent(ui::KeyEvent* event,
aura::Window* target) {
DCHECK(target);
target->GetRootWindow()->AsRootWindowHostDelegate()->OnHostKeyEvent(event);
}
} // namespace
///////////////////////////////////////////////////////////////////////////////
// StickyKeys
StickyKeys::StickyKeys()
: shift_sticky_key_(
new StickyKeysHandler(ui::EF_SHIFT_DOWN,
new StickyKeysHandlerDelegateImpl())),
alt_sticky_key_(
new StickyKeysHandler(ui::EF_ALT_DOWN,
new StickyKeysHandlerDelegateImpl())),
ctrl_sticky_key_(
new StickyKeysHandler(ui::EF_CONTROL_DOWN,
new StickyKeysHandlerDelegateImpl())) {
}
StickyKeys::~StickyKeys() {
}
bool StickyKeys::HandleKeyEvent(ui::KeyEvent* event) {
return shift_sticky_key_->HandleKeyEvent(event) ||
alt_sticky_key_->HandleKeyEvent(event) ||
ctrl_sticky_key_->HandleKeyEvent(event);
}
///////////////////////////////////////////////////////////////////////////////
// StickyKeysHandler
StickyKeysHandler::StickyKeysHandler(ui::EventFlags target_modifier_flag,
StickyKeysHandlerDelegate* delegate)
: modifier_flag_(target_modifier_flag),
current_state_(DISABLED),
keyevent_from_myself_(false),
preparing_to_enable_(false),
delegate_(delegate) {
}
StickyKeysHandler::~StickyKeysHandler() {
}
StickyKeysHandler::StickyKeysHandlerDelegate::StickyKeysHandlerDelegate() {
}
StickyKeysHandler::StickyKeysHandlerDelegate::~StickyKeysHandlerDelegate() {
}
bool StickyKeysHandler::HandleKeyEvent(ui::KeyEvent* event) {
if (keyevent_from_myself_)
return false; // Do not handle self-generated key event.
switch (current_state_) {
case DISABLED:
return HandleDisabledState(event);
case ENABLED:
return HandleEnabledState(event);
case LOCKED:
return HandleLockedState(event);
}
NOTREACHED();
return false;
}
StickyKeysHandler::KeyEventType
StickyKeysHandler::TranslateKeyEvent(ui::KeyEvent* event) {
bool is_target_key = false;
if (event->key_code() == ui::VKEY_SHIFT ||
event->key_code() == ui::VKEY_LSHIFT ||
event->key_code() == ui::VKEY_RSHIFT) {
is_target_key = (modifier_flag_ == ui::EF_SHIFT_DOWN);
} else if (event->key_code() == ui::VKEY_CONTROL ||
event->key_code() == ui::VKEY_LCONTROL ||
event->key_code() == ui::VKEY_RCONTROL) {
is_target_key = (modifier_flag_ == ui::EF_CONTROL_DOWN);
} else if (event->key_code() == ui::VKEY_MENU ||
event->key_code() == ui::VKEY_LMENU ||
event->key_code() == ui::VKEY_RMENU) {
is_target_key = (modifier_flag_ == ui::EF_ALT_DOWN);
} else {
return event->type() == ui::ET_KEY_PRESSED ?
NORMAL_KEY_DOWN : NORMAL_KEY_UP;
}
if (is_target_key) {
return event->type() == ui::ET_KEY_PRESSED ?
TARGET_MODIFIER_DOWN : TARGET_MODIFIER_UP;
}
return event->type() == ui::ET_KEY_PRESSED ?
OTHER_MODIFIER_DOWN : OTHER_MODIFIER_UP;
}
bool StickyKeysHandler::HandleDisabledState(ui::KeyEvent* event) {
switch (TranslateKeyEvent(event)) {
case TARGET_MODIFIER_UP:
if (preparing_to_enable_) {
preparing_to_enable_ = false;
current_state_ = ENABLED;
modifier_up_event_.reset(event->Copy());
return true;
}
return false;
case TARGET_MODIFIER_DOWN:
preparing_to_enable_ = true;
return false;
case NORMAL_KEY_DOWN:
preparing_to_enable_ = false;
return false;
case NORMAL_KEY_UP:
case OTHER_MODIFIER_DOWN:
case OTHER_MODIFIER_UP:
return false;
}
NOTREACHED();
return false;
}
bool StickyKeysHandler::HandleEnabledState(ui::KeyEvent* event) {
switch (TranslateKeyEvent(event)) {
case NORMAL_KEY_UP:
case TARGET_MODIFIER_DOWN:
return true;
case TARGET_MODIFIER_UP:
current_state_ = LOCKED;
modifier_up_event_.reset();
return true;
case NORMAL_KEY_DOWN: {
DCHECK(modifier_up_event_.get());
aura::Window* target = static_cast<aura::Window*>(event->target());
DCHECK(target);
current_state_ = DISABLED;
AppendModifier(event);
// We can't post event, so dispatch current keyboard event first then
// dispatch next keyboard event.
keyevent_from_myself_ = true;
delegate_->DispatchKeyEvent(event, target);
delegate_->DispatchKeyEvent(modifier_up_event_.get(), target);
keyevent_from_myself_ = false;
return true;
}
case OTHER_MODIFIER_DOWN:
case OTHER_MODIFIER_UP:
return false;
}
NOTREACHED();
return false;
}
bool StickyKeysHandler::HandleLockedState(ui::KeyEvent* event) {
switch (TranslateKeyEvent(event)) {
case TARGET_MODIFIER_DOWN:
return true;
case TARGET_MODIFIER_UP:
current_state_ = DISABLED;
return false;
case NORMAL_KEY_DOWN:
case NORMAL_KEY_UP:
AppendModifier(event);
return false;
case OTHER_MODIFIER_DOWN:
case OTHER_MODIFIER_UP:
return false;
}
NOTREACHED();
return false;
}
void StickyKeysHandler::AppendModifier(ui::KeyEvent* event) {
XEvent* xev = event->native_event();
XKeyEvent* xkey = &(xev->xkey);
switch (modifier_flag_) {
case ui::EF_CONTROL_DOWN:
xkey->state |= ControlMask;
break;
case ui::EF_ALT_DOWN:
xkey->state |= Mod1Mask;
break;
case ui::EF_SHIFT_DOWN:
xkey->state |= ShiftMask;
break;
default:
NOTREACHED();
}
event->set_flags(event->flags() | modifier_flag_);
event->set_character(ui::GetCharacterFromKeyCode(event->key_code(),
event->flags()));
event->NormalizeFlags();
}
} // namespace ash
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