Converts mash to use the common non-client frame

ash/mus/frame/caption_buttons/frame_caption_button.cc

-// Copyright 2015 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/mus/frame/caption_buttons/frame_caption_button.h"
-
-#include "ui/base/resource/resource_bundle.h"
-#include "ui/gfx/animation/slide_animation.h"
-#include "ui/gfx/animation/throb_animation.h"
-#include "ui/gfx/canvas.h"
-
-namespace ash {
-namespace mus {
-
-namespace {
-
-// The duration of the crossfade animation when swapping the button's images.
-const int kSwapImagesAnimationDurationMs = 200;
-
-// The duration of the fade out animation of the old icon during a crossfade
-// animation as a ratio of |kSwapImagesAnimationDurationMs|.
-const float kFadeOutRatio = 0.5f;
-
-// The alpha to draw inactive icons with.
-const float kInactiveIconAlpha = 0.2f;
-
-}  // namespace
-
-// static
-const char FrameCaptionButton::kViewClassName[] = "FrameCaptionButton";
-
-FrameCaptionButton::FrameCaptionButton(views::ButtonListener* listener,
-                                       CaptionButtonIcon icon)
-    : CustomButton(listener),
-      icon_(icon),
-      paint_as_active_(false),
-      alpha_(255),
-      icon_image_id_(-1),
-      hovered_background_image_id_(-1),
-      pressed_background_image_id_(-1),
-      swap_images_animation_(new gfx::SlideAnimation(this)) {
-  swap_images_animation_->Reset(1);
-
-  // Do not flip the gfx::Canvas passed to the OnPaint() method. The snap left
-  // and snap right button icons should not be flipped. The other icons are
-  // horizontally symmetrical.
-}
-
-FrameCaptionButton::~FrameCaptionButton() {}
-
-void FrameCaptionButton::SetImages(CaptionButtonIcon icon,
-                                   Animate animate,
-                                   int icon_image_id,
-                                   int hovered_background_image_id,
-                                   int pressed_background_image_id) {
-  // The early return is dependant on |animate| because callers use SetImages()
-  // with ANIMATE_NO to progress the crossfade animation to the end.
-  if (icon == icon_ &&
-      (animate == ANIMATE_YES || !swap_images_animation_->is_animating()) &&
-      icon_image_id == icon_image_id_ &&
-      hovered_background_image_id == hovered_background_image_id_ &&
-      pressed_background_image_id == pressed_background_image_id_) {
-    return;
-  }
-
-  if (animate == ANIMATE_YES)
-    crossfade_icon_image_ = icon_image_;
-
-  icon_ = icon;
-  icon_image_id_ = icon_image_id;
-  // TODO(sky): it doesn't seem like these are used.
-  hovered_background_image_id_ = hovered_background_image_id;
-  pressed_background_image_id_ = pressed_background_image_id;
-
-  ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
-  icon_image_ = *rb.GetImageSkiaNamed(icon_image_id);
-  hovered_background_image_ =
-      *rb.GetImageSkiaNamed(hovered_background_image_id);
-  pressed_background_image_ =
-      *rb.GetImageSkiaNamed(pressed_background_image_id);
-
-  if (animate == ANIMATE_YES) {
-    swap_images_animation_->Reset(0);
-    swap_images_animation_->SetSlideDuration(kSwapImagesAnimationDurationMs);
-    swap_images_animation_->Show();
-  } else {
-    swap_images_animation_->Reset(1);
-  }
-  PreferredSizeChanged();
-  SchedulePaint();
-}
-
-bool FrameCaptionButton::IsAnimatingImageSwap() const {
-  return swap_images_animation_->is_animating();
-}
-
-void FrameCaptionButton::SetAlpha(int alpha) {
-  if (alpha_ != alpha) {
-    alpha_ = alpha;
-    SchedulePaint();
-  }
-}
-
-gfx::Size FrameCaptionButton::GetPreferredSize() const {
-  return hovered_background_image_.isNull() ? gfx::Size()
-                                            : hovered_background_image_.size();
-}
-
-const char* FrameCaptionButton::GetClassName() const {
-  return kViewClassName;
-}
-
-void FrameCaptionButton::OnPaint(gfx::Canvas* canvas) {
-  if (hover_animation().is_animating() || state() == STATE_HOVERED) {
-    int hovered_background_alpha =
-        hover_animation().CurrentValueBetween(0, 255);
-    SkPaint paint;
-    paint.setAlpha(hovered_background_alpha);
-    canvas->DrawImageInt(hovered_background_image_, 0, 0, paint);
-  } else if (state() == STATE_PRESSED) {
-    canvas->DrawImageInt(pressed_background_image_, 0, 0);
-  }
-
-  int icon_alpha = swap_images_animation_->CurrentValueBetween(0, 255);
-  int crossfade_icon_alpha = 0;
-  if (icon_alpha < static_cast<int>(kFadeOutRatio * 255))
-    crossfade_icon_alpha = static_cast<int>(255 - icon_alpha / kFadeOutRatio);
-
-  if (crossfade_icon_alpha > 0 && !crossfade_icon_image_.isNull()) {
-    gfx::Canvas icon_canvas(icon_image_.size(), canvas->image_scale(), false);
-    SkPaint paint;
-    paint.setAlpha(icon_alpha);
-    icon_canvas.DrawImageInt(icon_image_, 0, 0, paint);
-
-    paint.setAlpha(crossfade_icon_alpha);
-    paint.setXfermodeMode(SkXfermode::kPlus_Mode);
-    icon_canvas.DrawImageInt(crossfade_icon_image_, 0, 0, paint);
-
-    PaintCentered(canvas, gfx::ImageSkia(icon_canvas.ExtractImageRep()),
-                  alpha_);
-  } else {
-    if (!swap_images_animation_->is_animating())
-      icon_alpha = alpha_;
-    PaintCentered(canvas, icon_image_, icon_alpha);
-  }
-}
-
-void FrameCaptionButton::OnGestureEvent(ui::GestureEvent* event) {
-  // CustomButton does not become pressed when the user drags off and then back
-  // onto the button. Make FrameCaptionButton pressed in this case because this
-  // behavior is more consistent with AlternateFrameSizeButton.
-  if (event->type() == ui::ET_GESTURE_SCROLL_BEGIN ||
-      event->type() == ui::ET_GESTURE_SCROLL_UPDATE) {
-    if (HitTestPoint(event->location())) {
-      SetState(STATE_PRESSED);
-      RequestFocus();
-      event->StopPropagation();
-    } else {
-      SetState(STATE_NORMAL);
-    }
-  } else if (event->type() == ui::ET_GESTURE_SCROLL_END) {
-    if (HitTestPoint(event->location())) {
-      SetState(STATE_HOVERED);
-      NotifyClick(*event);
-      event->StopPropagation();
-    }
-  }
-  CustomButton::OnGestureEvent(event);
-}
-
-void FrameCaptionButton::PaintCentered(gfx::Canvas* canvas,
-                                       const gfx::ImageSkia& to_center,
-                                       int alpha) {
-  if (!paint_as_active_) {
-    // Paint icons as active when they are hovered over or pressed.
-    double inactive_alpha = kInactiveIconAlpha;
-    if (hover_animation().is_animating()) {
-      inactive_alpha =
-          hover_animation().CurrentValueBetween(inactive_alpha, 1.0f);
-    } else if (state() == STATE_PRESSED || state() == STATE_HOVERED) {
-      inactive_alpha = 1.0f;
-    }
-    alpha *= inactive_alpha;
-  }
-
-  SkPaint paint;
-  paint.setAlpha(alpha);
-  canvas->DrawImageInt(to_center, (width() - to_center.width()) / 2,
-                       (height() - to_center.height()) / 2, paint);
-}
-
-}  // namespace mus
-}  // namespace ash