Palette tool laser prototype.

ash/common/system/chromeos/palette/tools/laser_pointer_mode.cc

+// 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 "ash/common/system/chromeos/palette/tools/laser_pointer_mode.h"
+
+#include "ash/common/palette_delegate.h"
+#include "ash/common/system/chromeos/palette/palette_ids.h"
+#include "ash/common/system/chromeos/palette/tools/laser_pointer_view.h"
+#include "ash/common/wm_shell.h"
+#include "grit/ash_strings.h"
+#include "ui/base/l10n/l10n_util.h"
+#include "ui/wm/core/coordinate_conversion.h"
+#include "ui/wm/core/cursor_manager.h"
+
+namespace ash {
+namespace {
+
+// A point gets removed from the collection if it is older than
+// |kPointLifeDurationMs|.
+const int kPointLifeDurationMs = 200;
+
+// When no move events are being recieved we add a new point every
+// |kAddStationaryPointsDelayMs| so that points older than
+// |kPointLifeDurationMs| can get removed.
+const int kAddStationaryPointsDelayMs = 5;
+
+}  // namespace
+
+LaserPointerMode::LaserPointerMode(Delegate* delegate)
+    : CommonPaletteTool(delegate) {
+  laser_pointer_view_.reset(new LaserPointerView(
+      base::TimeDelta::FromMilliseconds(kPointLifeDurationMs)));
+  timer_.reset(new base::Timer(
+      FROM_HERE, base::TimeDelta::FromMilliseconds(kAddStationaryPointsDelayMs),
+      base::Bind(&LaserPointerMode::AddStationaryPoint, base::Unretained(this)),
+      true));
+  WmShell::Get()->AddPointerWatcher(this, true);
+}
+
+LaserPointerMode::~LaserPointerMode() {
+  OnDisable();
+  WmShell::Get()->RemovePointerWatcher(this);
+}
+
+PaletteGroup LaserPointerMode::GetGroup() const {
+  return PaletteGroup::MODE;
+}
+
+PaletteToolId LaserPointerMode::GetToolId() const {
+  return PaletteToolId::LASER_POINTER;
+}
+
+void LaserPointerMode::OnEnable() {
+  CommonPaletteTool::OnEnable();
+
+  WmShell::Get()->palette_delegate()->OnLaserPointerEnabled();
+  laser_pointer_view_->AddNewPoint(current_mouse_location_);
+}
+
+void LaserPointerMode::OnDisable() {
+  CommonPaletteTool::OnDisable();
+
+  WmShell::Get()->palette_delegate()->OnLaserPointerDisabled();
+  StopTimer();
+  laser_pointer_view_->Stop();
+}
+
+gfx::VectorIconId LaserPointerMode::GetActiveTrayIcon() {
+  return gfx::VectorIconId::PALETTE_TRAY_ICON_LASER_POINTER;
+}
+
+gfx::VectorIconId LaserPointerMode::GetPaletteIconId() {
+  return gfx::VectorIconId::PALETTE_MODE_LASER_POINTER;
+}
+
+views::View* LaserPointerMode::CreateView() {
+  return CreateDefaultView(
+      l10n_util::GetStringUTF16(IDS_ASH_STYLUS_TOOLS_LASER_POINTER_MODE));
+}
+
+void LaserPointerMode::StopTimer() {
+  timer_repeat_count_ = 0;
+  timer_->Stop();
+}
+
+void LaserPointerMode::AddStationaryPoint() {
+  laser_pointer_view_->AddNewPoint(current_mouse_location_);
+  // We can stop repeating the timer once the mouse has been stationary for
+  // longer than the life of a point.
+  if (timer_repeat_count_++ * kAddStationaryPointsDelayMs >=
+      kPointLifeDurationMs) {
+    StopTimer();
+  }
+}
+
+void LaserPointerMode::OnPointerEventObserved(
+    const ui::PointerEvent& event,
+    const gfx::Point& location_in_screen,
+    views::Widget* target) {
+  // TODO(sammiequon): Add support for pointer drags. See crbug.com/640410.
+  if (event.type() == ui::ET_POINTER_MOVED &&
+      event.pointer_details().pointer_type ==
+          ui::EventPointerType::POINTER_TYPE_PEN) {
+    current_mouse_location_ = location_in_screen;
+    if (enabled()) {
+      laser_pointer_view_->AddNewPoint(current_mouse_location_);
+      timer_repeat_count_ = 0;
+      if (!timer_->IsRunning())
+        timer_->Reset();
+    }
+  }
+}
+}  // namespace ash