Ash frames: dark frames now use white caption buttons.

ash/frame/default_header_painter.cc

 // Copyright 2014 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/frame/default_header_painter.h"
 
 #include "ash/frame/caption_buttons/frame_caption_button_container_view.h"
 #include "ash/frame/header_painter_util.h"
 #include "base/debug/leak_annotations.h"
 #include "base/logging.h"  // DCHECK
@@ skipping 21 matching lines @@
 const SkColor kTitleTextColor = SkColorSetRGB(40, 40, 40);
 // Color of the active window header/content separator line.
 const SkColor kHeaderContentSeparatorColor = SkColorSetRGB(150, 150, 152);
 // Color of the inactive window header/content separator line.
 const SkColor kHeaderContentSeparatorInactiveColor =
     SkColorSetRGB(180, 180, 182);
 // The default color of the frame.
 const SkColor kDefaultFrameColor = SkColorSetRGB(242, 242, 242);
 // Duration of crossfade animation for activating and deactivating frame.
 const int kActivationCrossfadeDurationMs = 200;
+// Luminance below which to use white caption buttons.
+const int kMaxLuminanceForLightButtons = 125;
 
 // Tiles an image into an area, rounding the top corners.
 void TileRoundRect(gfx::Canvas* canvas,
                    const SkPaint& paint,
                    const gfx::Rect& bounds,
                    int corner_radius) {
   SkRect rect = gfx::RectToSkRect(bounds);
   const SkScalar corner_radius_scalar = SkIntToScalar(corner_radius);
   SkScalar radii[8] = {
       corner_radius_scalar, corner_radius_scalar,  // top-left
@@ skipping 40 matching lines @@
 void DefaultHeaderPainter::Init(
     views::Widget* frame,
     views::View* header_view,
     FrameCaptionButtonContainerView* caption_button_container) {
   DCHECK(frame);
   DCHECK(header_view);
   DCHECK(caption_button_container);
   frame_ = frame;
   view_ = header_view;
   caption_button_container_ = caption_button_container;
-
-  caption_button_container_->SetButtonImages(
-      CAPTION_BUTTON_ICON_MINIMIZE,
-      IDR_AURA_WINDOW_CONTROL_ICON_MINIMIZE,
-      IDR_AURA_WINDOW_CONTROL_ICON_MINIMIZE_I,
-      IDR_AURA_WINDOW_CONTROL_BACKGROUND_H,
-      IDR_AURA_WINDOW_CONTROL_BACKGROUND_P);
-  UpdateSizeButtonImages();
-  caption_button_container_->SetButtonImages(
-      CAPTION_BUTTON_ICON_CLOSE,
-      IDR_AURA_WINDOW_CONTROL_ICON_CLOSE,
-      IDR_AURA_WINDOW_CONTROL_ICON_CLOSE_I,
-      IDR_AURA_WINDOW_CONTROL_BACKGROUND_H,
-      IDR_AURA_WINDOW_CONTROL_BACKGROUND_P);
-
-  // There is no dedicated icon for the snap-left and snap-right buttons
-  // when |frame_| is inactive because they should never be visible while
-  // |frame_| is inactive.
-  caption_button_container_->SetButtonImages(
-      CAPTION_BUTTON_ICON_LEFT_SNAPPED,
-      IDR_AURA_WINDOW_CONTROL_ICON_LEFT_SNAPPED,
-      IDR_AURA_WINDOW_CONTROL_ICON_LEFT_SNAPPED,
-      IDR_AURA_WINDOW_CONTROL_BACKGROUND_H,
-      IDR_AURA_WINDOW_CONTROL_BACKGROUND_P);
-  caption_button_container_->SetButtonImages(
-      CAPTION_BUTTON_ICON_RIGHT_SNAPPED,
-      IDR_AURA_WINDOW_CONTROL_ICON_RIGHT_SNAPPED,
-      IDR_AURA_WINDOW_CONTROL_ICON_RIGHT_SNAPPED,
-      IDR_AURA_WINDOW_CONTROL_BACKGROUND_H,
-      IDR_AURA_WINDOW_CONTROL_BACKGROUND_P);
+  UpdateAllButtonImages();
 }
 
 int DefaultHeaderPainter::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 DefaultHeaderPainter::PaintHeader(gfx::Canvas* canvas, Mode mode) {
   Mode old_mode = mode_;
   mode_ = mode;
 
   if (mode_ != old_mode) {
+    UpdateAllButtonImages();
     if (!initial_paint_ && 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
@@ skipping 18 matching lines @@
   }
   if (frame_->widget_delegate() &&
       frame_->widget_delegate()->ShouldShowWindowTitle()) {
     PaintTitleBar(canvas);
   }
   if (!UsesCustomFrameColors())
     PaintHeaderContentSeparator(canvas);
 }
 
 void DefaultHeaderPainter::LayoutHeader() {
-  UpdateSizeButtonImages();
+  UpdateSizeButtonImages(ShouldUseLightImages());
   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());
 
@@ skipping 19 matching lines @@
   if (left_view_x_inset_ != left_view_x_inset) {
     left_view_x_inset_ = left_view_x_inset;
     LayoutLeftHeaderView();
   }
 }
 
 void DefaultHeaderPainter::SetFrameColors(SkColor active_frame_color,
                                           SkColor inactive_frame_color) {
   active_frame_color_ = active_frame_color;
   inactive_frame_color_ = inactive_frame_color;
+  UpdateAllButtonImages();
 }
 
 void DefaultHeaderPainter::UpdateLeftHeaderView(views::View* left_header_view) {
   left_header_view_ = left_header_view;
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 // gfx::AnimationDelegate overrides:
 
 void DefaultHeaderPainter::AnimationProgressed(
@@ skipping 70 matching lines @@
     // container.
     // Floor when computing the center of |caption_button_container_|.
     gfx::Size size = left_header_view_->GetPreferredSize();
     int icon_offset_y = caption_button_container_->height() / 2 -
                         size.height() / 2;
     left_header_view_->SetBounds(
         left_view_x_inset_, icon_offset_y, size.width(), size.height());
   }
 }
 
-void DefaultHeaderPainter::UpdateSizeButtonImages() {
+bool DefaultHeaderPainter::ShouldUseLightImages() {
+  int luminance = color_utils::GetLuminanceForColor(
+      mode_ == MODE_INACTIVE ? inactive_frame_color_ : active_frame_color_);
+  return luminance < kMaxLuminanceForLightButtons;
+}
+
+void DefaultHeaderPainter::UpdateAllButtonImages() {
+  bool use_light_images = ShouldUseLightImages();
+  caption_button_container_->SetButtonImages(
+      CAPTION_BUTTON_ICON_MINIMIZE,
+      use_light_images ? IDR_AURA_WINDOW_CONTROL_ICON_MINIMIZE_WHITE
+                       : IDR_AURA_WINDOW_CONTROL_ICON_MINIMIZE,
+      IDR_AURA_WINDOW_CONTROL_BACKGROUND_H,
+      IDR_AURA_WINDOW_CONTROL_BACKGROUND_P);
+
+  UpdateSizeButtonImages(use_light_images);
+
+  caption_button_container_->SetButtonImages(
+      CAPTION_BUTTON_ICON_CLOSE,
+      use_light_images ? IDR_AURA_WINDOW_CONTROL_ICON_CLOSE_WHITE
+                       : IDR_AURA_WINDOW_CONTROL_ICON_CLOSE,
+      IDR_AURA_WINDOW_CONTROL_BACKGROUND_H,
+      IDR_AURA_WINDOW_CONTROL_BACKGROUND_P);
+
+  caption_button_container_->SetButtonImages(
+      CAPTION_BUTTON_ICON_LEFT_SNAPPED,
+      use_light_images ? IDR_AURA_WINDOW_CONTROL_ICON_LEFT_SNAPPED_WHITE
+                       : IDR_AURA_WINDOW_CONTROL_ICON_LEFT_SNAPPED,
+      IDR_AURA_WINDOW_CONTROL_BACKGROUND_H,
+      IDR_AURA_WINDOW_CONTROL_BACKGROUND_P);
+
+  caption_button_container_->SetButtonImages(
+      CAPTION_BUTTON_ICON_RIGHT_SNAPPED,
+      use_light_images ? IDR_AURA_WINDOW_CONTROL_ICON_RIGHT_SNAPPED_WHITE
+                       : IDR_AURA_WINDOW_CONTROL_ICON_RIGHT_SNAPPED,
+      IDR_AURA_WINDOW_CONTROL_BACKGROUND_H,
+      IDR_AURA_WINDOW_CONTROL_BACKGROUND_P);
+}
+
+void DefaultHeaderPainter::UpdateSizeButtonImages(bool use_light_images) {
   int icon_id = 0;
-  int inactive_icon_id = 0;
   if (frame_->IsMaximized() || frame_->IsFullscreen()) {
-    icon_id = IDR_AURA_WINDOW_CONTROL_ICON_RESTORE;
-    inactive_icon_id = IDR_AURA_WINDOW_CONTROL_ICON_RESTORE_I;
+    icon_id = use_light_images ? IDR_AURA_WINDOW_CONTROL_ICON_RESTORE_WHITE
+                               : IDR_AURA_WINDOW_CONTROL_ICON_RESTORE;
   } else {
-    icon_id = IDR_AURA_WINDOW_CONTROL_ICON_MAXIMIZE;
-    inactive_icon_id = IDR_AURA_WINDOW_CONTROL_ICON_MAXIMIZE_I;
+    icon_id = use_light_images ? IDR_AURA_WINDOW_CONTROL_ICON_MAXIMIZE_WHITE
+                               : IDR_AURA_WINDOW_CONTROL_ICON_MAXIMIZE;
   }
   caption_button_container_->SetButtonImages(
       CAPTION_BUTTON_ICON_MAXIMIZE_RESTORE,
       icon_id,
-      inactive_icon_id,
       IDR_AURA_WINDOW_CONTROL_BACKGROUND_H,
       IDR_AURA_WINDOW_CONTROL_BACKGROUND_P);
 }
 
 gfx::Rect DefaultHeaderPainter::GetLocalBounds() const {
   return gfx::Rect(view_->width(), height_);
 }
 
 gfx::Rect DefaultHeaderPainter::GetTitleBounds() const {
   return HeaderPainterUtil::GetTitleBounds(
       left_header_view_, caption_button_container_, GetTitleFontList());
 }
 
 bool DefaultHeaderPainter::UsesCustomFrameColors() const {
   return active_frame_color_ != kDefaultFrameColor ||
          inactive_frame_color_ != kDefaultFrameColor;
 }
 
 }  // namespace ash