WIP - allow vector icons to specify motion.

chrome/browser/ui/views/toolbar/app_menu_animation.cc

-// Copyright 2017 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/ui/views/toolbar/app_menu_animation.h"
-
-#include "base/memory/ptr_util.h"
-#include "cc/paint/paint_flags.h"
-#include "chrome/browser/ui/views/toolbar/app_menu_button.h"
-#include "ui/gfx/animation/tween.h"
-#include "ui/gfx/canvas.h"
-#include "ui/gfx/color_palette.h"
-#include "ui/gfx/color_utils.h"
-#include "ui/gfx/skia_util.h"
-
-namespace {
-
-// Duration of the open and close animations in ms.
-constexpr float kOpenDurationMs = 733.0f;
-constexpr float kCloseDurationMs = 283.0f;
-
-// Duration of the color animation in ms.
-constexpr float kColorDurationMs = 100.0f;
-
-// The % the top and bottom dots need to be offset from the middle.
-constexpr float kDotYOffset = 0.32f;
-
-// Value of the stroke when the icon is opened or closed.
-constexpr float kCloseStroke = 0.204f;
-constexpr float kOpenStroke = 0.136f;
-
-// Value of the width when the animation is fully opened.
-constexpr float kOpenWidth = 0.52f;
-
-// The delay of the color and dot animations in ms.
-constexpr float kColorDelayMs = 33.33f;
-constexpr float kDotDelayMs = 66.67f;
-
-// The % of time it takes for each dot to animate to its full width.
-constexpr float kTopWidthOpenInterval = 533.3f / kOpenDurationMs;
-constexpr float kMiddleWidthOpenInterval = 383.3f / kOpenDurationMs;
-constexpr float kBottomWidthOpenInterval = 400.0f / kOpenDurationMs;
-
-// The % of time it takes for each dot to animate to its final stroke.
-constexpr float kTopStrokeOpenInterval = 400.0f / kOpenDurationMs;
-constexpr float kMiddleStrokeOpenInterval = 283.3f / kOpenDurationMs;
-constexpr float kBottomStrokeOpenInterval = 266.7f / kOpenDurationMs;
-
-// The % of time it takes for each dot to animate its width and stroke.
-constexpr float kWidthStrokeCloseInterval = 150.0f / kCloseDurationMs;
-
-}  // namespace
-
-AppMenuAnimation::AppMenuDot::AppMenuDot(base::TimeDelta delay,
-                                         float width_open_interval,
-                                         float stroke_open_interval)
-    : delay_(delay),
-      width_open_interval_(width_open_interval),
-      stroke_open_interval_(stroke_open_interval) {}
-
-void AppMenuAnimation::AppMenuDot::Paint(const gfx::PointF& center_point,
-                                         SkColor start_color,
-                                         SkColor target_color,
-                                         gfx::Canvas* canvas,
-                                         const gfx::Rect& bounds,
-                                         const gfx::SlideAnimation* animation) {
-  bool is_opening = animation->IsShowing();
-  float total_duration = is_opening ? kOpenDurationMs : kCloseDurationMs;
-  float width_duration =
-      is_opening ? width_open_interval_ : kWidthStrokeCloseInterval;
-  float stroke_duration =
-      is_opening ? stroke_open_interval_ : kWidthStrokeCloseInterval;
-
-  // When the animation is closing, each dot uses the remainder of the full
-  // delay period (2 * kDotDelayMs). The results should be (0->2x, 1x->1x,
-  // 2x->0).
-  base::TimeDelta delay =
-      is_opening ? delay_
-                 : base::TimeDelta::FromMilliseconds(kDotDelayMs * 2) - delay_;
-  float progress =
-      animation->GetCurrentValue() - (delay.InMillisecondsF() / total_duration);
-
-  float width_progress = 0.0;
-  float stroke_progress = 0.0;
-  float color_progress = 0.0;
-
-  if (progress > 0) {
-    width_progress = std::min(1.0f, progress / width_duration);
-    stroke_progress = std::min(1.0f, progress / stroke_duration);
-
-    if (is_opening) {
-      float color_delay_interval = kColorDelayMs / total_duration;
-      float color_duration_interval = kColorDurationMs / total_duration;
-      if (progress > color_delay_interval) {
-        color_progress = std::min(
-            1.0f, (progress - color_delay_interval) / color_duration_interval);
-      }
-    }
-  }
-
-  float dot_height =
-      gfx::Tween::FloatValueBetween(stroke_progress, kCloseStroke, kOpenStroke);
-  dot_height *= bounds.height();
-
-  float dot_width =
-      gfx::Tween::FloatValueBetween(width_progress, kCloseStroke, kOpenWidth);
-  dot_width *= bounds.width();
-
-  gfx::PointF point = center_point;
-  point.Offset(-dot_width / 2, -dot_height / 2);
-
-  SkColor color = is_opening ? gfx::Tween::ColorValueBetween(
-                                   color_progress, start_color, target_color)
-                             : target_color;
-
-  cc::PaintFlags flags;
-  flags.setColor(color);
-  flags.setStrokeWidth(bounds.height() * kCloseStroke);
-  flags.setStrokeCap(cc::PaintFlags::kRound_Cap);
-  flags.setStyle(cc::PaintFlags::kFill_Style);
-  flags.setAntiAlias(true);
-
-  gfx::SizeF dot_size = gfx::SizeF(dot_width, dot_height);
-  canvas->DrawRoundRect(gfx::RectF(point, dot_size), 2.0, flags);
-}
-
-AppMenuAnimation::AppMenuAnimation(AppMenuButton* owner, SkColor initial_color)
-    : owner_(owner),
-      animation_(base::MakeUnique<gfx::SlideAnimation>(this)),
-      bottom_dot_(base::TimeDelta(),
-                  kBottomWidthOpenInterval,
-                  kBottomStrokeOpenInterval),
-      middle_dot_(base::TimeDelta::FromMilliseconds(kDotDelayMs),
-                  kMiddleWidthOpenInterval,
-                  kMiddleStrokeOpenInterval),
-      top_dot_(base::TimeDelta::FromMilliseconds(kDotDelayMs * 2),
-               kTopWidthOpenInterval,
-               kTopStrokeOpenInterval),
-      start_color_(initial_color),
-      target_color_(initial_color) {
-  animation_->SetSlideDuration(kOpenDurationMs);
-  animation_->SetTweenType(gfx::Tween::FAST_OUT_SLOW_IN);
-}
-
-AppMenuAnimation::~AppMenuAnimation() {}
-
-void AppMenuAnimation::PaintAppMenu(gfx::Canvas* canvas,
-                                    const gfx::Rect& bounds) {
-  gfx::PointF middle_point = gfx::PointF(bounds.CenterPoint());
-  float y_offset = kDotYOffset * bounds.height();
-  gfx::PointF top_point = middle_point;
-  top_point.Offset(0, -y_offset);
-
-  gfx::PointF bottom_point = middle_point;
-  bottom_point.Offset(0, y_offset);
-
-  middle_dot_.Paint(middle_point, start_color_, target_color_, canvas, bounds,
-                    animation_.get());
-  top_dot_.Paint(top_point, start_color_, target_color_, canvas, bounds,
-                 animation_.get());
-  bottom_dot_.Paint(bottom_point, start_color_, target_color_, canvas, bounds,
-                    animation_.get());
-}
-
-void AppMenuAnimation::StartAnimation() {
-  if (!animation_->is_animating()) {
-    animation_->SetSlideDuration(kOpenDurationMs);
-    animation_->Show();
-    owner_->AppMenuAnimationStarted();
-  }
-}
-
-void AppMenuAnimation::AnimationEnded(const gfx::Animation* animation) {
-  if (animation_->IsShowing()) {
-    animation_->SetSlideDuration(kCloseDurationMs);
-    animation_->Hide();
-  } else {
-    start_color_ = target_color_;
-  }
-
-  owner_->AppMenuAnimationEnded();
-}
-
-void AppMenuAnimation::AnimationProgressed(const gfx::Animation* animation) {
-  owner_->SchedulePaint();
-}