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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/gfx/x/window_event_manager.h"
#include <stddef.h>
#include "ui/gfx/x/connection.h"
#include "ui/gfx/x/future.h"
namespace x11 {
namespace {
// Asks the X server to set |window|'s event mask to |new_mask|.
void SetEventMask(Connection* connection, Window window, EventMask new_mask) {
// Window |window| may already be destroyed at this point, so the
// change_attributes request may give a BadWindow error. In this case, just
// ignore the error.
connection
->ChangeWindowAttributes(ChangeWindowAttributesRequest{
.window = window, .event_mask = static_cast<EventMask>(new_mask)})
.IgnoreError();
}
} // anonymous namespace
ScopedEventSelector::ScopedEventSelector() = default;
ScopedEventSelector::ScopedEventSelector(Connection* connection,
Window window,
EventMask event_mask)
: window_(window),
event_mask_(event_mask),
event_manager_(&connection->window_event_manager()) {
event_manager_->SelectEvents(window_, event_mask_);
}
ScopedEventSelector::ScopedEventSelector(ScopedEventSelector&& other) {
Swap(other);
}
ScopedEventSelector& ScopedEventSelector::operator=(
ScopedEventSelector&& other) {
Reset();
Swap(other);
return *this;
}
ScopedEventSelector::~ScopedEventSelector() {
Reset();
}
void ScopedEventSelector::Swap(ScopedEventSelector& other) {
std::swap(window_, other.window_);
std::swap(event_mask_, other.event_mask_);
std::swap(event_manager_, other.event_manager_);
}
void ScopedEventSelector::Reset() {
if (event_manager_) {
event_manager_->DeselectEvents(window_, event_mask_);
}
window_ = Window::None;
event_mask_ = EventMask::NoEvent;
event_manager_ = nullptr;
}
class WindowEventManager::MultiMask {
public:
MultiMask() {}
MultiMask(const MultiMask&) = delete;
MultiMask& operator=(const MultiMask&) = delete;
~MultiMask() = default;
void AddMask(EventMask mask) {
for (size_t i = 0; i < mask_bits_.size(); i++) {
if (static_cast<uint32_t>(mask) & (1 << i)) {
mask_bits_[i]++;
}
}
}
void RemoveMask(EventMask mask) {
for (size_t i = 0; i < mask_bits_.size(); i++) {
if (static_cast<uint32_t>(mask) & (1 << i)) {
CHECK(mask_bits_[i]);
mask_bits_[i]--;
}
}
}
EventMask ToMask() const {
EventMask mask = EventMask::NoEvent;
for (size_t i = 0; i < mask_bits_.size(); i++) {
if (mask_bits_[i]) {
mask = mask | static_cast<EventMask>(1 << i);
}
}
return mask;
}
private:
// The array size here must match the number of different event mask bits
// defined in X11/X.h and the events described in the libX11 protocol docs.
std::array<int, 25> mask_bits_{};
};
WindowEventManager::WindowEventManager(Connection* connection)
: connection_(connection) {}
WindowEventManager::~WindowEventManager() {
Reset();
}
void WindowEventManager::Reset() {
if (!connection_) {
return;
}
// Clear events still requested by not-yet-deleted ScopedEventSelectors.
for (const auto& mask_pair : mask_map_) {
SetEventMask(connection_, mask_pair.first, EventMask::NoEvent);
}
connection_ = nullptr;
}
void WindowEventManager::SelectEvents(Window window, EventMask event_mask) {
std::unique_ptr<MultiMask>& mask = mask_map_[window];
if (!mask) {
mask = std::make_unique<MultiMask>();
}
EventMask old_mask = mask_map_[window]->ToMask();
mask->AddMask(event_mask);
AfterMaskChanged(window, old_mask);
}
void WindowEventManager::DeselectEvents(Window window, EventMask event_mask) {
CHECK(mask_map_.find(window) != mask_map_.end());
std::unique_ptr<MultiMask>& mask = mask_map_[window];
EventMask old_mask = mask->ToMask();
mask->RemoveMask(event_mask);
AfterMaskChanged(window, old_mask);
}
void WindowEventManager::AfterMaskChanged(Window window, EventMask old_mask) {
EventMask new_mask = mask_map_[window]->ToMask();
if (new_mask == old_mask) {
return;
}
if (connection_) {
SetEventMask(connection_, window, new_mask);
}
if (new_mask == EventMask::NoEvent) {
mask_map_.erase(window);
}
}
} // namespace x11
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