[Refactor] Move code for painting the window header for browser windows out of ash

chrome/browser/ui/views/frame/browser_header_painter_ash.cc

+// Copyright 2013 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/frame/browser_header_painter_ash.h"
+
+#include "ash/frame/caption_buttons/frame_caption_button_container_view.h"
+#include "ash/frame/header_painter_util.h"
+#include "base/logging.h"  // DCHECK
+#include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/views/frame/browser_frame.h"
+#include "chrome/browser/ui/views/frame/browser_view.h"
+#include "grit/ash_resources.h"
+#include "grit/theme_resources.h"
+#include "third_party/skia/include/core/SkCanvas.h"
+#include "third_party/skia/include/core/SkColor.h"
+#include "third_party/skia/include/core/SkPaint.h"
+#include "third_party/skia/include/core/SkPath.h"
+#include "ui/base/resource/resource_bundle.h"
+#include "ui/base/theme_provider.h"
+#include "ui/gfx/animation/slide_animation.h"
+#include "ui/gfx/canvas.h"
+#include "ui/gfx/image/image_skia.h"
+#include "ui/gfx/rect.h"
+#include "ui/gfx/skia_util.h"
+#include "ui/views/view.h"
+#include "ui/views/widget/widget.h"
+#include "ui/views/widget/widget_delegate.h"
+
+using views::Widget;
+
+namespace {
+// Color for the restored window title text.
+const SkColor kRestoredWindowTitleTextColor = SkColorSetRGB(40, 40, 40);
+// Color for the maximized window title text.
+const SkColor kMaximizedWindowTitleTextColor = SK_ColorWHITE;
+// Duration of crossfade animation for activating and deactivating frame.
+const int kActivationCrossfadeDurationMs = 200;
+
+// Tiles an image into an area, rounding the top corners. Samples |image|
+// starting |image_inset_x| pixels from the left of the image.
+void TileRoundRect(gfx::Canvas* canvas,
+                   const gfx::ImageSkia& image,
+                   const SkPaint& paint,
+                   const gfx::Rect& bounds,
+                   int top_left_corner_radius,
+                   int top_right_corner_radius,
+                   int image_inset_x) {
+  SkRect rect = gfx::RectToSkRect(bounds);
+  const SkScalar kTopLeftRadius = SkIntToScalar(top_left_corner_radius);
+  const SkScalar kTopRightRadius = SkIntToScalar(top_right_corner_radius);
+  SkScalar radii[8] = {
+      kTopLeftRadius, kTopLeftRadius,  // top-left
+      kTopRightRadius, kTopRightRadius,  // top-right
+      0, 0,   // bottom-right
+      0, 0};  // bottom-left
+  SkPath path;
+  path.addRoundRect(rect, radii, SkPath::kCW_Direction);
+  canvas->DrawImageInPath(image, -image_inset_x, 0, path, paint);
+}
+
+// Tiles |frame_image| and |frame_overlay_image| into an area, rounding the top
+// corners.
+void PaintFrameImagesInRoundRect(gfx::Canvas* canvas,
+                                 const gfx::ImageSkia& frame_image,
+                                 const gfx::ImageSkia& frame_overlay_image,
+                                 const SkPaint& paint,
+                                 const gfx::Rect& bounds,
+                                 int corner_radius,
+                                 int image_inset_x) {
+  SkXfermode::Mode normal_mode;
+  SkXfermode::AsMode(NULL, &normal_mode);
+
+  // If |paint| is using an unusual SkXfermode::Mode (this is the case while
+  // crossfading), we must create a new canvas to overlay |frame_image| and
+  // |frame_overlay_image| using |normal_mode| and then paint the result
+  // using the unusual mode. We try to avoid this because creating a new
+  // browser-width canvas is expensive.
+  bool fast_path = (frame_overlay_image.isNull() ||
+      SkXfermode::IsMode(paint.getXfermode(), normal_mode));
+  if (fast_path) {
+    TileRoundRect(canvas, frame_image, paint, bounds, corner_radius,
+        corner_radius, image_inset_x);
+
+    if (!frame_overlay_image.isNull()) {
+      // Adjust |bounds| such that |frame_overlay_image| is not tiled.
+      gfx::Rect overlay_bounds = bounds;
+      overlay_bounds.Intersect(
+          gfx::Rect(bounds.origin(), frame_overlay_image.size()));
+      int top_left_corner_radius = corner_radius;
+      int top_right_corner_radius = corner_radius;
+      if (overlay_bounds.width() < bounds.width() - corner_radius)
+        top_right_corner_radius = 0;
+      TileRoundRect(canvas, frame_overlay_image, paint, overlay_bounds,
+          top_left_corner_radius, top_right_corner_radius, 0);
+    }
+  } else {
+    gfx::Canvas temporary_canvas(bounds.size(), canvas->image_scale(), false);
+    temporary_canvas.TileImageInt(frame_image,
+                                  image_inset_x, 0,
+                                  0, 0,
+                                  bounds.width(), bounds.height());
+    temporary_canvas.DrawImageInt(frame_overlay_image, 0, 0);
+    TileRoundRect(canvas, gfx::ImageSkia(temporary_canvas.ExtractImageRep()),
+        paint, bounds, corner_radius, corner_radius, 0);
+  }
+}
+
+}  // namespace
+
+///////////////////////////////////////////////////////////////////////////////
+// BrowserHeaderPainterAsh, public:
+
+BrowserHeaderPainterAsh::BrowserHeaderPainterAsh()
+    : frame_(NULL),
+      is_tabbed_(false),
+      is_incognito_(false),
+      view_(NULL),
+      window_icon_(NULL),
+      caption_button_container_(NULL),
+      painted_height_(0),
+      initial_paint_(true),
+      mode_(MODE_INACTIVE),
+      activation_animation_(new gfx::SlideAnimation(this)) {
+}
+
+BrowserHeaderPainterAsh::~BrowserHeaderPainterAsh() {
+}
+
+void BrowserHeaderPainterAsh::Init(
+    views::Widget* frame,
+    BrowserView* browser_view,
+    views::View* header_view,
+    views::View* window_icon,
+    ash::FrameCaptionButtonContainerView* caption_button_container) {
+  DCHECK(frame);
+  DCHECK(browser_view);
+  DCHECK(header_view);
+  // window_icon may be NULL.
+  DCHECK(caption_button_container);
+  frame_ = frame;
+
+  is_tabbed_ = browser_view->browser()->is_type_tabbed();
+  is_incognito_ = !browser_view->IsRegularOrGuestSession();
+
+  view_ = header_view;
+  window_icon_ = window_icon;
+  caption_button_container_ = caption_button_container;
+}
+
+int BrowserHeaderPainterAsh::GetMinimumHeaderWidth() const {
+  // Ensure we have enough space for the window icon and buttons. We allow
+  // the title string to collapse to zero width.
+  return GetTitleBounds().x() +
+      caption_button_container_->GetMinimumSize().width();
+}
+
+void BrowserHeaderPainterAsh::PaintHeader(gfx::Canvas* canvas, Mode mode) {
+  Mode old_mode = mode_;
+  mode_ = mode;
+
+  if (mode_ != old_mode) {
+    if (!initial_paint_ &&
+        ash::HeaderPainterUtil::CanAnimateActivation(frame_)) {
+      activation_animation_->SetSlideDuration(kActivationCrossfadeDurationMs);
+      if (mode_ == MODE_ACTIVE)
+        activation_animation_->Show();
+      else
+        activation_animation_->Hide();
+    } else {
+      if (mode_ == MODE_ACTIVE)
+        activation_animation_->Reset(1);
+      else
+        activation_animation_->Reset(0);
+    }
+    initial_paint_ = false;
+  }
+
+  int corner_radius = (frame_->IsMaximized() || frame_->IsFullscreen()) ?
+      0 : ash::HeaderPainterUtil::GetTopCornerRadiusWhenRestored();
+
+  int active_alpha = activation_animation_->CurrentValueBetween(0, 255);
+  int inactive_alpha = 255 - active_alpha;
+
+  SkPaint paint;
+  if (inactive_alpha > 0) {
+    if (active_alpha > 0)
+      paint.setXfermodeMode(SkXfermode::kPlus_Mode);
+
+    gfx::ImageSkia inactive_frame_image;
+    gfx::ImageSkia inactive_frame_overlay_image;
+    GetFrameImages(MODE_INACTIVE, &inactive_frame_image,
+        &inactive_frame_overlay_image);
+
+    paint.setAlpha(inactive_alpha);
+    PaintFrameImagesInRoundRect(
+        canvas,
+        inactive_frame_image,
+        inactive_frame_overlay_image,
+        paint,
+        GetPaintedBounds(),
+        corner_radius,
+        ash::HeaderPainterUtil::GetThemeBackgroundXInset());
+  }
+
+  if (active_alpha > 0) {
+    gfx::ImageSkia active_frame_image;
+    gfx::ImageSkia active_frame_overlay_image;
+    GetFrameImages(MODE_ACTIVE, &active_frame_image,
+        &active_frame_overlay_image);
+
+    paint.setAlpha(active_alpha);
+    PaintFrameImagesInRoundRect(
+        canvas,
+        active_frame_image,
+        active_frame_overlay_image,
+        paint,
+        GetPaintedBounds(),
+        corner_radius,
+        ash::HeaderPainterUtil::GetThemeBackgroundXInset());
+  }
+
+  if (!frame_->IsMaximized() && !frame_->IsFullscreen())
+    PaintHighlightForRestoredWindow(canvas);
+  if (frame_->widget_delegate() &&
+      frame_->widget_delegate()->ShouldShowWindowTitle()) {
+    PaintTitleBar(canvas);
+  }
+}
+
+void BrowserHeaderPainterAsh::LayoutHeader() {
+  // Purposefully set |painted_height_| to an invalid value. We cannot use
+  // |painted_height_| because the computation of |painted_height_| may depend
+  // on having laid out the window controls.
+  painted_height_ = -1;
+
+  UpdateCaptionButtonImages();
+  caption_button_container_->Layout();
+
+  gfx::Size caption_button_container_size =
+      caption_button_container_->GetPreferredSize();
+  caption_button_container_->SetBounds(
+      view_->width() - caption_button_container_size.width(),
+      0,
+      caption_button_container_size.width(),
+      caption_button_container_size.height());
+
+  if (window_icon_) {
+    // Vertically center the window icon with respect to the caption button
+    // container.
+    int icon_size = ash::HeaderPainterUtil::GetIconSize();
+    int icon_offset_y = (caption_button_container_->height() - icon_size) / 2;
+    window_icon_->SetBounds(ash::HeaderPainterUtil::GetIconXOffset(),
+        icon_offset_y, icon_size, icon_size);
+  }
+}
+
+int BrowserHeaderPainterAsh::GetHeaderHeightForPainting() const {
+  return painted_height_;
+}
+
+void BrowserHeaderPainterAsh::SetHeaderHeightForPainting(int height) {
+  painted_height_ = height;
+}
+
+void BrowserHeaderPainterAsh::SchedulePaintForTitle() {
+  view_->SchedulePaintInRect(GetTitleBounds());
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// gfx::AnimationDelegate overrides:
+
+void BrowserHeaderPainterAsh::AnimationProgressed(
+    const gfx::Animation* animation) {
+  view_->SchedulePaintInRect(GetPaintedBounds());
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// BrowserHeaderPainterAsh, private:
+
+void BrowserHeaderPainterAsh::PaintHighlightForRestoredWindow(
+    gfx::Canvas* canvas) {
+  ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
+  gfx::ImageSkia top_left_corner = *rb.GetImageSkiaNamed(
+      IDR_AURA_BROWSER_WINDOW_HEADER_SHADE_TOP_LEFT);
+  gfx::ImageSkia top_right_corner = *rb.GetImageSkiaNamed(
+      IDR_AURA_BROWSER_WINDOW_HEADER_SHADE_TOP_RIGHT);
+  gfx::ImageSkia top_edge = *rb.GetImageSkiaNamed(
+      IDR_AURA_BROWSER_WINDOW_HEADER_SHADE_TOP);
+  gfx::ImageSkia left_edge = *rb.GetImageSkiaNamed(
+      IDR_AURA_BROWSER_WINDOW_HEADER_SHADE_LEFT);
+  gfx::ImageSkia right_edge = *rb.GetImageSkiaNamed(
+      IDR_AURA_BROWSER_WINDOW_HEADER_SHADE_RIGHT);
+
+  int top_left_width = top_left_corner.width();
+  int top_left_height = top_left_corner.height();
+  canvas->DrawImageInt(top_left_corner, 0, 0);
+
+  int top_right_width = top_right_corner.width();
+  int top_right_height = top_right_corner.height();
+  canvas->DrawImageInt(top_right_corner,
+                       view_->width() - top_right_width,
+                       0);
+
+  canvas->TileImageInt(
+      top_edge,
+      top_left_width,
+      0,
+      view_->width() - top_left_width - top_right_width,
+      top_edge.height());
+
+  canvas->TileImageInt(left_edge,
+                       0,
+                       top_left_height,
+                       left_edge.width(),
+                       painted_height_ - top_left_height);
+
+  canvas->TileImageInt(right_edge,
+                       view_->width() - right_edge.width(),
+                       top_right_height,
+                       right_edge.width(),
+                       painted_height_ - top_right_height);
+}
+
+void BrowserHeaderPainterAsh::PaintTitleBar(gfx::Canvas* canvas) {
+  // The window icon is painted by its own views::View.
+  gfx::Rect title_bounds = GetTitleBounds();
+  title_bounds.set_x(view_->GetMirroredXForRect(title_bounds));
+  SkColor title_color = (frame_->IsMaximized() || frame_->IsFullscreen()) ?
+      kMaximizedWindowTitleTextColor : kRestoredWindowTitleTextColor;
+  canvas->DrawStringRectWithFlags(frame_->widget_delegate()->GetWindowTitle(),
+                                  BrowserFrame::GetTitleFontList(),
+                                  title_color,
+                                  title_bounds,
+                                  gfx::Canvas::NO_SUBPIXEL_RENDERING);
+}
+
+void BrowserHeaderPainterAsh::GetFrameImages(
+    Mode mode,
+    gfx::ImageSkia* frame_image,
+    gfx::ImageSkia* frame_overlay_image) const {
+  if (is_tabbed_) {
+    GetFrameImagesForTabbedBrowser(mode, frame_image, frame_overlay_image);
+  } else {
+    *frame_image = GetFrameImageForNonTabbedBrowser(mode);
+    *frame_overlay_image = gfx::ImageSkia();
+  }
+}
+
+void BrowserHeaderPainterAsh::GetFrameImagesForTabbedBrowser(
+    Mode mode,
+    gfx::ImageSkia* frame_image,
+    gfx::ImageSkia* frame_overlay_image) const {
+  int frame_image_id = 0;
+  int frame_overlay_image_id = 0;
+
+  ui::ThemeProvider* tp = frame_->GetThemeProvider();
+  if (tp->HasCustomImage(IDR_THEME_FRAME_OVERLAY) && !is_incognito_) {
+    frame_overlay_image_id = (mode == MODE_ACTIVE) ?
+        IDR_THEME_FRAME_OVERLAY : IDR_THEME_FRAME_OVERLAY_INACTIVE;
+  }
+
+  if (mode == MODE_ACTIVE) {
+    frame_image_id = is_incognito_ ?
+        IDR_THEME_FRAME_INCOGNITO : IDR_THEME_FRAME;
+  } else {
+    frame_image_id = is_incognito_ ?
+        IDR_THEME_FRAME_INCOGNITO_INACTIVE : IDR_THEME_FRAME_INACTIVE;
+  }
+
+  if ((frame_->IsMaximized() || frame_->IsFullscreen()) &&
+      !tp->HasCustomImage(IDR_THEME_FRAME) &&
+      !tp->HasCustomImage(frame_image_id) &&
+      frame_overlay_image_id == 0) {
+    *frame_image = *tp->GetImageSkiaNamed(
+        IDR_AURA_BROWSER_WINDOW_HEADER_BASE_MAXIMIZED);
+  } else {
+    *frame_image = *tp->GetImageSkiaNamed(frame_image_id);
+  }
+
+  *frame_overlay_image = (frame_overlay_image_id == 0) ?
+      gfx::ImageSkia() : *tp->GetImageSkiaNamed(frame_overlay_image_id);
+}
+
+gfx::ImageSkia BrowserHeaderPainterAsh::GetFrameImageForNonTabbedBrowser(
+    Mode mode) const {
+  ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
+  if (frame_->IsMaximized() || frame_->IsFullscreen())
+    return *rb.GetImageSkiaNamed(IDR_AURA_BROWSER_WINDOW_HEADER_BASE_MAXIMIZED);
+
+  if (mode == MODE_ACTIVE) {
+    return *rb.GetImageSkiaNamed(is_incognito_ ?
+        IDR_AURA_BROWSER_WINDOW_HEADER_BASE_RESTORED_INCOGNITO_ACTIVE :
+        IDR_AURA_BROWSER_WINDOW_HEADER_BASE_RESTORED_ACTIVE);
+  }
+  return *rb.GetImageSkiaNamed(is_incognito_ ?
+      IDR_AURA_BROWSER_WINDOW_HEADER_BASE_RESTORED_INCOGNITO_INACTIVE :
+      IDR_AURA_BROWSER_WINDOW_HEADER_BASE_RESTORED_INACTIVE);
+}
+
+void BrowserHeaderPainterAsh::UpdateCaptionButtonImages() {
+  if (frame_->IsMaximized() || frame_->IsFullscreen()) {
+    caption_button_container_->SetButtonImages(
+        ash::CAPTION_BUTTON_ICON_MINIMIZE,
+        IDR_AURA_BROWSER_WINDOW_CONTROL_ICON_MAXIMIZED_MINIMIZE,
+        IDR_AURA_BROWSER_WINDOW_CONTROL_ICON_MAXIMIZED_MINIMIZE,
+        IDR_AURA_BROWSER_WINDOW_CONTROL_BACKGROUND_MAXIMIZED_H,
+        IDR_AURA_BROWSER_WINDOW_CONTROL_BACKGROUND_MAXIMIZED_P);
+    caption_button_container_->SetButtonImages(
+        ash::CAPTION_BUTTON_ICON_MAXIMIZE_RESTORE,
+        IDR_AURA_BROWSER_WINDOW_CONTROL_ICON_MAXIMIZED_SIZE,
+        IDR_AURA_BROWSER_WINDOW_CONTROL_ICON_MAXIMIZED_SIZE,
+        IDR_AURA_BROWSER_WINDOW_CONTROL_BACKGROUND_MAXIMIZED_H,
+        IDR_AURA_BROWSER_WINDOW_CONTROL_BACKGROUND_MAXIMIZED_P);
+    caption_button_container_->SetButtonImages(
+        ash::CAPTION_BUTTON_ICON_CLOSE,
+        IDR_AURA_BROWSER_WINDOW_CONTROL_ICON_MAXIMIZED_CLOSE,
+        IDR_AURA_BROWSER_WINDOW_CONTROL_ICON_MAXIMIZED_CLOSE,
+        IDR_AURA_BROWSER_WINDOW_CONTROL_BACKGROUND_MAXIMIZED_H,
+        IDR_AURA_BROWSER_WINDOW_CONTROL_BACKGROUND_MAXIMIZED_P);
+    caption_button_container_->SetButtonImages(
+        ash::CAPTION_BUTTON_ICON_LEFT_SNAPPED,
+        IDR_AURA_BROWSER_WINDOW_CONTROL_ICON_MAXIMIZED_LEFT_SNAPPED,
+        IDR_AURA_BROWSER_WINDOW_CONTROL_ICON_MAXIMIZED_LEFT_SNAPPED,
+        IDR_AURA_BROWSER_WINDOW_CONTROL_BACKGROUND_MAXIMIZED_H,
+        IDR_AURA_BROWSER_WINDOW_CONTROL_BACKGROUND_MAXIMIZED_P);
+    caption_button_container_->SetButtonImages(
+        ash::CAPTION_BUTTON_ICON_RIGHT_SNAPPED,
+        IDR_AURA_BROWSER_WINDOW_CONTROL_ICON_MAXIMIZED_RIGHT_SNAPPED,
+        IDR_AURA_BROWSER_WINDOW_CONTROL_ICON_MAXIMIZED_RIGHT_SNAPPED,
+        IDR_AURA_BROWSER_WINDOW_CONTROL_BACKGROUND_MAXIMIZED_H,
+        IDR_AURA_BROWSER_WINDOW_CONTROL_BACKGROUND_MAXIMIZED_P);
+  } else {
+    caption_button_container_->SetButtonImages(
+        ash::CAPTION_BUTTON_ICON_MINIMIZE,
+        IDR_AURA_BROWSER_WINDOW_CONTROL_ICON_RESTORED_MINIMIZE,
+        IDR_AURA_BROWSER_WINDOW_CONTROL_ICON_RESTORED_MINIMIZE,
+        IDR_AURA_BROWSER_WINDOW_CONTROL_BACKGROUND_RESTORED_H,
+        IDR_AURA_BROWSER_WINDOW_CONTROL_BACKGROUND_RESTORED_P);
+    caption_button_container_->SetButtonImages(
+        ash::CAPTION_BUTTON_ICON_MAXIMIZE_RESTORE,
+        IDR_AURA_BROWSER_WINDOW_CONTROL_ICON_RESTORED_SIZE,
+        IDR_AURA_BROWSER_WINDOW_CONTROL_ICON_RESTORED_SIZE,
+        IDR_AURA_BROWSER_WINDOW_CONTROL_BACKGROUND_RESTORED_H,
+        IDR_AURA_BROWSER_WINDOW_CONTROL_BACKGROUND_RESTORED_P);
+    caption_button_container_->SetButtonImages(
+        ash::CAPTION_BUTTON_ICON_CLOSE,
+        IDR_AURA_BROWSER_WINDOW_CONTROL_ICON_RESTORED_CLOSE,
+        IDR_AURA_BROWSER_WINDOW_CONTROL_ICON_RESTORED_CLOSE,
+        IDR_AURA_BROWSER_WINDOW_CONTROL_BACKGROUND_RESTORED_H,
+        IDR_AURA_BROWSER_WINDOW_CONTROL_BACKGROUND_RESTORED_P);
+    caption_button_container_->SetButtonImages(
+        ash::CAPTION_BUTTON_ICON_LEFT_SNAPPED,
+        IDR_AURA_BROWSER_WINDOW_CONTROL_ICON_RESTORED_LEFT_SNAPPED,
+        IDR_AURA_BROWSER_WINDOW_CONTROL_ICON_RESTORED_LEFT_SNAPPED,
+        IDR_AURA_BROWSER_WINDOW_CONTROL_BACKGROUND_RESTORED_H,
+        IDR_AURA_BROWSER_WINDOW_CONTROL_BACKGROUND_RESTORED_P);
+    caption_button_container_->SetButtonImages(
+        ash::CAPTION_BUTTON_ICON_RIGHT_SNAPPED,
+        IDR_AURA_BROWSER_WINDOW_CONTROL_ICON_RESTORED_RIGHT_SNAPPED,
+        IDR_AURA_BROWSER_WINDOW_CONTROL_ICON_RESTORED_RIGHT_SNAPPED,
+        IDR_AURA_BROWSER_WINDOW_CONTROL_BACKGROUND_RESTORED_H,
+        IDR_AURA_BROWSER_WINDOW_CONTROL_BACKGROUND_RESTORED_P);
+  }
+}
+
+gfx::Rect BrowserHeaderPainterAsh::GetPaintedBounds() const {
+  return gfx::Rect(view_->width(), painted_height_);
+}
+
+gfx::Rect BrowserHeaderPainterAsh::GetTitleBounds() const {
+  return ash::HeaderPainterUtil::GetTitleBounds(window_icon_,
+      caption_button_container_, BrowserFrame::GetTitleFontList());
+}