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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/351564777): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include "ui/events/event_modifiers.h"
#include <array>
#include "ui/events/event.h"
#include "ui/events/event_constants.h"
namespace ui {
namespace {
constexpr auto kEventFlagFromModifiers = std::to_array<int>({
EF_NONE, // MODIFIER_NONE,
EF_SHIFT_DOWN, // MODIFIER_SHIFT
EF_CONTROL_DOWN, // MODIFIER_CONTROL
EF_ALT_DOWN, // MODIFIER_ALT
EF_COMMAND_DOWN, // MODIFIER_COMMAND
EF_ALTGR_DOWN, // MODIFIER_ALTGR
EF_MOD3_DOWN, // MODIFIER_MOD3
EF_CAPS_LOCK_ON, // MODIFIER_CAPS_LOCK
EF_LEFT_MOUSE_BUTTON, // MODIFIER_LEFT_MOUSE_BUTTON
EF_MIDDLE_MOUSE_BUTTON, // MODIFIER_MIDDLE_MOUSE_BUTTON
EF_RIGHT_MOUSE_BUTTON, // MODIFIER_RIGHT_MOUSE_BUTTON
EF_BACK_MOUSE_BUTTON, // MODIFIER_BACK_MOUSE_BUTTON
EF_FORWARD_MOUSE_BUTTON, // MODIFIER_FORWARD_MOUSE_BUTTON
EF_FUNCTION_DOWN, // MODIFIER_FUNCTION
});
} // namespace
EventModifiers::EventModifiers() {
memset(
modifiers_down_.data(), 0,
(modifiers_down_.size() * sizeof(decltype(modifiers_down_)::value_type)));
}
EventModifiers::~EventModifiers() {}
void EventModifiers::UpdateModifier(unsigned int modifier, bool down) {
DCHECK_LT(modifier, static_cast<unsigned int>(MODIFIER_NUM_MODIFIERS));
if (down) {
modifiers_down_[modifier]++;
} else {
// Ignore spurious modifier "up" events. This might happen if the
// button is down during startup.
if (modifiers_down_[modifier])
modifiers_down_[modifier]--;
}
UpdateFlags(modifier);
}
void EventModifiers::UpdateModifierLock(unsigned int modifier, bool down) {
DCHECK_LT(modifier, static_cast<unsigned int>(MODIFIER_NUM_MODIFIERS));
if (down)
modifier_flags_locked_ ^= kEventFlagFromModifiers[modifier];
UpdateFlags(modifier);
}
void EventModifiers::SetModifierLock(unsigned int modifier, bool locked) {
DCHECK_LT(modifier, static_cast<unsigned int>(MODIFIER_NUM_MODIFIERS));
if (locked)
modifier_flags_locked_ |= kEventFlagFromModifiers[modifier];
else
modifier_flags_locked_ &= ~kEventFlagFromModifiers[modifier];
UpdateFlags(modifier);
}
void EventModifiers::UpdateFlags(unsigned int modifier) {
int mask = kEventFlagFromModifiers[modifier];
bool down = modifiers_down_[modifier] != 0;
bool locked = (modifier_flags_locked_ & mask) != 0;
if (down != locked)
modifier_flags_ |= mask;
else
modifier_flags_ &= ~mask;
}
int EventModifiers::GetModifierFlags() {
return modifier_flags_;
}
void EventModifiers::ResetKeyboardModifiers() {
static const int kKeyboardModifiers[] = {MODIFIER_SHIFT, MODIFIER_CONTROL,
MODIFIER_ALT, MODIFIER_COMMAND,
MODIFIER_ALTGR, MODIFIER_MOD3};
for (const int modifier : kKeyboardModifiers) {
modifiers_down_[modifier] = 0;
UpdateFlags(modifier);
}
}
// static
int EventModifiers::GetEventFlagFromModifier(unsigned int modifier) {
return kEventFlagFromModifiers[modifier];
}
// static
int EventModifiers::GetModifierFromEventFlag(int flag) {
switch (flag) {
case EF_SHIFT_DOWN:
return MODIFIER_SHIFT;
case EF_CONTROL_DOWN:
return MODIFIER_CONTROL;
case EF_ALT_DOWN:
return MODIFIER_ALT;
case EF_COMMAND_DOWN:
return MODIFIER_COMMAND;
case EF_ALTGR_DOWN:
return MODIFIER_ALTGR;
case EF_MOD3_DOWN:
return MODIFIER_MOD3;
case EF_FUNCTION_DOWN:
return MODIFIER_FUNCTION;
case EF_CAPS_LOCK_ON:
return MODIFIER_CAPS_LOCK;
case EF_LEFT_MOUSE_BUTTON:
return MODIFIER_LEFT_MOUSE_BUTTON;
case EF_MIDDLE_MOUSE_BUTTON:
return MODIFIER_MIDDLE_MOUSE_BUTTON;
case EF_RIGHT_MOUSE_BUTTON:
return MODIFIER_RIGHT_MOUSE_BUTTON;
case EF_BACK_MOUSE_BUTTON:
return MODIFIER_BACK_MOUSE_BUTTON;
case EF_FORWARD_MOUSE_BUTTON:
return MODIFIER_FORWARD_MOUSE_BUTTON;
default:
return MODIFIER_NONE;
}
}
} // namespace ui
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