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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ash/clipboard/control_v_histogram_recorder.h"
#include "ash/accelerators/accelerator_controller_impl.h"
#include "ash/accelerators/accelerator_history_impl.h"
#include "ash/shell.h"
#include "base/containers/contains.h"
#include "base/metrics/histogram_functions.h"
#include "base/time/time.h"
#include "ui/events/event.h"
#include "ui/events/event_constants.h"
namespace ash {
namespace {
// Returns whether Ctrl and V are currently pressed, with no additional keys.
bool IsControlVPressed() {
const auto& currently_pressed_keys = Shell::Get()
->accelerator_controller()
->GetAcceleratorHistory()
->currently_pressed_keys();
return base::Contains(currently_pressed_keys, ui::VKEY_CONTROL) &&
base::Contains(currently_pressed_keys, ui::VKEY_V) &&
currently_pressed_keys.size() == 2;
}
} // namespace
void ControlVHistogramRecorder::OnKeyEvent(ui::KeyEvent* event) {
if (event->type() == ui::EventType::kKeyPressed) {
switch (event->key_code()) {
case ui::VKEY_CONTROL:
// If Ctrl is held down and either auto-repeat begins or the other Ctrl
// key is pressed, the timestamp used for calculating Ctrl to V delay
// should not change.
if (!(event->flags() & ui::EF_IS_REPEAT))
ctrl_pressed_time_ = base::TimeTicks::Now();
return;
case ui::VKEY_V:
if (IsControlVPressed()) {
// When Ctrl+V is held and keyboard auto-repeat is enabled, the OS
// will synthesize more key pressed events to trigger further pasting.
// Record the initial V press to measure how long Ctrl+V is held.
if (ctrl_v_pressed_time_.is_null())
ctrl_v_pressed_time_ = base::TimeTicks::Now();
// The V key can be pressed to issue multiple pastes without ever
// releasing Ctrl. Measure only the time between a Ctrl press and the
// first V press in the user's accelerator sequence.
if (!ctrl_pressed_time_.is_null()) {
base::UmaHistogramTimes("Ash.ClipboardHistory.ControlToVDelayV2",
ctrl_v_pressed_time_ - ctrl_pressed_time_);
ctrl_pressed_time_ = base::TimeTicks();
}
}
return;
default:
// Pressing an unrelated key ends a Ctrl+V paste sequence.
MaybeRecordControlVHeldTime();
return;
}
}
if (event->type() == ui::EventType::kKeyReleased) {
switch (event->key_code()) {
case ui::VKEY_CONTROL:
case ui::VKEY_V:
// Releasing either key ends a Ctrl+V paste sequence.
MaybeRecordControlVHeldTime();
return;
default:
return;
}
}
}
void ControlVHistogramRecorder::MaybeRecordControlVHeldTime() {
if (ctrl_v_pressed_time_.is_null())
return;
base::UmaHistogramTimes("Ash.ClipboardHistory.ControlVHeldTime",
base::TimeTicks::Now() - ctrl_v_pressed_time_);
ctrl_v_pressed_time_ = base::TimeTicks();
}
} // namespace ash
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