Adds background fade in animation and exit label to touch calibrator view

chrome/browser/chromeos/display/touch_calibrator/touch_calibrator_view.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 "chrome/browser/chromeos/display/touch_calibrator/touch_calibrator_view.h"
 
 #include "ash/display/window_tree_host_manager.h"
 #include "ash/public/cpp/shell_window_ids.h"
 #include "ash/shell.h"
 #include "ui/aura/window.h"
+#include "ui/base/resource/resource_bundle.h"
+#include "ui/gfx/animation/linear_animation.h"
 #include "ui/gfx/canvas.h"
+#include "ui/strings/grit/ui_strings.h"
+#include "ui/views/controls/label.h"
 #include "ui/views/widget/widget.h"
 
 namespace chromeos {
 
 namespace {
 
 constexpr char kWidgetName[] = "TouchCalibratorOverlay";
 
+const int kAnimationFrameRate = 100;
+const int kFadeDurationInMs = 150;
+
+const SkColor kExitLabelColor = SkColorSetARGBInline(255, 96, 96, 96);
+const SkColor kExitLabelShadowColor = SkColorSetARGBInline(255, 11, 11, 11);
+const int kExitLabelWidth = 300;
+const int kExitLabelHeight = 20;
+
+const float kBackgroundFinalOpacity = 0.75f;

[stevenjb, 2016/12/22 22:03:32]

constexpr for all of these.

[malaykeshav, 2016/12/23 00:09:06]

done

+
 // Returns the initialization params for the widget that contains the touch
 // calibrator view.
 views::Widget::InitParams GetWidgetParams(aura::Window* root_window) {
   views::Widget::InitParams params;
   params.type = views::Widget::InitParams::TYPE_WINDOW_FRAMELESS;
   params.name = kWidgetName;
   params.keep_on_top = true;
   params.accept_events = true;
   params.activatable = views::Widget::InitParams::ACTIVATABLE_NO;
   params.ownership = views::Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
   params.opacity = views::Widget::InitParams::TRANSLUCENT_WINDOW;
   params.parent = ash::Shell::GetContainer(
       root_window, ash::kShellWindowId_OverlayContainer);
   return params;
 }
 
 }  // namespace
 
 TouchCalibratorView::TouchCalibratorView(const display::Display& target_display,
                                          bool is_primary_view)
-    : display_(target_display), is_primary_view_(is_primary_view) {
+    : display_(target_display),
+      is_primary_view_(is_primary_view),
+      exit_label_(nullptr) {
   aura::Window* root = ash::Shell::GetInstance()
                            ->window_tree_host_manager()
                            ->GetRootWindowForDisplayId(display_.id());
   widget_.reset(new views::Widget);
   widget_->Init(GetWidgetParams(root));
   widget_->SetContentsView(this);
   widget_->SetBounds(display_.bounds());
   widget_->Show();
   set_owned_by_client();
+
+  animator_.reset(
+      new gfx::LinearAnimation(kFadeDurationInMs, kAnimationFrameRate, this));
+
+  InitViewContents();
+  AdvanceToNextState();
 }
 
 TouchCalibratorView::~TouchCalibratorView() {
   state_ = UNKNOWN;
   widget_->Hide();
+  animator_->End();
+  if (exit_label_)
+    delete exit_label_;

[stevenjb, 2016/12/22 22:03:33]

Views are owned by the views hierarchy, this shouldn't be necessary.

[malaykeshav, 2016/12/23 00:09:06]

Done

+}
+
+void TouchCalibratorView::InitViewContents() {
+  // Initialize the background rect.
+  background_rect_ =
+      gfx::RectF(0, 0, display_.bounds().width(), display_.bounds().height());
+
+  ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
+  // Initialize exit label that informs the user how to exit the touch
+  // calibration setup.
+  exit_label_ = new views::Label(
+      rb.GetLocalizedString(IDS_DISPLAY_TOUCH_CALIBRATION_EXIT_LABEL),
+      rb.GetFontListWithDelta(8, gfx::Font::FontStyle::NORMAL,
+                              gfx::Font::Weight::NORMAL));
+  exit_label_->SetBounds((display_.bounds().width() - kExitLabelWidth) / 2,
+                         3 * display_.bounds().height() / 4, kExitLabelWidth,

[stevenjb, 2016/12/22 22:03:33]

nit: display_.bounds().height() * 3 / 4 is a little more readable.

[malaykeshav, 2016/12/23 00:09:06]

Done

+                         kExitLabelHeight);
+  exit_label_->SetEnabledColor(kExitLabelColor);
+  exit_label_->SetHorizontalAlignment(gfx::ALIGN_CENTER);
+  exit_label_->SetShadows(gfx::ShadowValues(
+      1, gfx::ShadowValue(gfx::Vector2d(1, 1), 1, kExitLabelShadowColor)));
+  exit_label_->SetSubpixelRenderingEnabled(false);
+  exit_label_->SetVisible(false);
+
+  AddChildView(exit_label_);
 }
 
 void TouchCalibratorView::OnPaint(gfx::Canvas* canvas) {
   OnPaintBackground(canvas);
 }
 
-void TouchCalibratorView::OnPaintBackground(gfx::Canvas* canvas) {}
+void TouchCalibratorView::OnPaintBackground(gfx::Canvas* canvas) {
+  float opacity =
+      state_ == BACKGROUND_FADING_OUT ? 0.f : kBackgroundFinalOpacity;

[stevenjb, 2016/12/22 22:03:32]

nit: Don't initialize this, set it in an else at line 121 instead.

[malaykeshav, 2016/12/23 00:09:06]

Done

+
+  // If current state is a fade in or fade out state then update opacity
+  // based on how far the animation has progressed.
+  if (animator_ && (state_ == TouchCalibratorView::BACKGROUND_FADING_OUT ||
+                    state_ == TouchCalibratorView::BACKGROUND_FADING_IN)) {
+    opacity = static_cast<float>(animator_->CurrentValueBetween(
+        start_opacity_value_, end_opacity_value_));
+  }
+
+  paint_.setColor(SkColorSetA(SK_ColorBLACK,
+                              std::numeric_limits<uint8_t>::max() * opacity));
+  canvas->DrawRect(background_rect_, paint_);
+}
 
 void TouchCalibratorView::AnimationProgressed(const gfx::Animation* animation) {
+  SchedulePaint();
 }
 
 void TouchCalibratorView::AnimationCanceled(const gfx::Animation* animation) {
   AnimationEnded(animation);
 }
 
-void TouchCalibratorView::AnimationEnded(const gfx::Animation* animation) {}
+void TouchCalibratorView::AnimationEnded(const gfx::Animation* animation) {
+  switch (state_) {
+    case BACKGROUND_FADING_IN:
+      exit_label_->SetVisible(true);
+      state_ = is_primary_view_ ? DISPLAY_POINT_1 : CALIBRATION_COMPLETE;
+      break;
+    default:
+      break;
+  }

[stevenjb, 2016/12/22 22:03:33]

if (state_ == BACKGROUND_FADING_IN) {
}

[malaykeshav, 2016/12/23 00:09:06]

This will be handling multiple states in the subsequent CL.

https://codereview.chromium.org/2502823002/diff/20001/chrome/browser/chromeos...

[stevenjb, 2016/12/23 00:16:11]

Normally I would suggest changing to a switch at that point, but it's fine.

+}
 
-void TouchCalibratorView::AdvanceToNextState() {}
+void TouchCalibratorView::AdvanceToNextState() {
+  // Stop any previous animations and skip them to the end.
+  animator_->End();
+
+  switch (state_) {
+    case UNKNOWN:
+    case BACKGROUND_FADING_IN:
+      state_ = BACKGROUND_FADING_IN;
+      start_opacity_value_ = 0.f;
+      end_opacity_value_ = kBackgroundFinalOpacity;
+
+      paint_.setStyle(SkPaint::kFill_Style);
+
+      animator_->SetDuration(kFadeDurationInMs);
+      break;
+    default:
+      break;
+  }

[stevenjb, 2016/12/22 22:03:33]

if (state_ == BACKGROUND_FADING_IN || state_ == UNKNOWN) {
}

In general, switch () is best used when handling all enum values with no
default. There are exceptions, but for just 1-2 values, if () is simpler.

[malaykeshav, 2016/12/23 00:09:06]

ditto

+  animator_->Start();
+}
 
 bool TouchCalibratorView::GetDisplayPointLocation(gfx::Point* location) {
   if (!is_primary_view_)
     return false;
   return false;
 }
 
 void TouchCalibratorView::SkipToFinalState() {}
 
+void TouchCalibratorView::SkipCurrentAnimation() {
+  if (animator_->is_animating())
+    animator_->End();
+}
+
 }  // namespace chromeos