ash/frame/default_header_painter.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ash/frame/default_header_painter.h"
   6
   7 #include "ash/frame/caption_buttons/frame_caption_button_container_view.h"
   8 #include "ash/frame/header_painter_util.h"
   9 #include "base/debug/leak_annotations.h"
  10 #include "base/logging.h"  // DCHECK
  11 #include "grit/ash_resources.h"
  12 #include "third_party/skia/include/core/SkPaint.h"
  13 #include "third_party/skia/include/core/SkPath.h"
  14 #include "ui/base/resource/resource_bundle.h"
  15 #include "ui/gfx/animation/slide_animation.h"
  16 #include "ui/gfx/canvas.h"
  17 #include "ui/gfx/color_utils.h"
  18 #include "ui/gfx/font_list.h"
  19 #include "ui/gfx/geometry/rect.h"
  20 #include "ui/gfx/image/image.h"
  21 #include "ui/gfx/skia_util.h"
  22 #include "ui/views/view.h"
  23 #include "ui/views/widget/native_widget_aura.h"
  24 #include "ui/views/widget/widget.h"
  25 #include "ui/views/widget/widget_delegate.h"
  26
  27 using views::Widget;
  28
  29 namespace {
  30
  31 // Color for the window title text.
  32 const SkColor kTitleTextColor = SkColorSetRGB(40, 40, 40);
  33 // Color of the active window header/content separator line.
  34 const SkColor kHeaderContentSeparatorColor = SkColorSetRGB(150, 150, 152);
  35 // Color of the inactive window header/content separator line.
  36 const SkColor kHeaderContentSeparatorInactiveColor =
  37     SkColorSetRGB(180, 180, 182);
  38 // The default color of the frame.
  39 const SkColor kDefaultFrameColor = SkColorSetRGB(242, 242, 242);
  40 // Duration of crossfade animation for activating and deactivating frame.
  41 const int kActivationCrossfadeDurationMs = 200;
  42 // Luminance below which to use white caption buttons.
  43 const int kMaxLuminanceForLightButtons = 125;
  44
  45 // Tiles an image into an area, rounding the top corners.
  46 void TileRoundRect(gfx::Canvas* canvas,
  47                    const SkPaint& paint,
  48                    const gfx::Rect& bounds,
  49                    int corner_radius) {
  50   SkRect rect = gfx::RectToSkRect(bounds);
  51   const SkScalar corner_radius_scalar = SkIntToScalar(corner_radius);
  52   SkScalar radii[8] = {
  53       corner_radius_scalar, corner_radius_scalar,  // top-left
  54       corner_radius_scalar, corner_radius_scalar,  // top-right
  55       0, 0,   // bottom-right
  56       0, 0};  // bottom-left
  57   SkPath path;
  58   path.addRoundRect(rect, radii, SkPath::kCW_Direction);
  59   canvas->DrawPath(path, paint);
  60 }
  61
  62 // Returns the FontList to use for the title.
  63 const gfx::FontList& GetTitleFontList() {
  64   static const gfx::FontList* title_font_list =
  65       new gfx::FontList(views::NativeWidgetAura::GetWindowTitleFontList());
  66   ANNOTATE_LEAKING_OBJECT_PTR(title_font_list);
  67   return *title_font_list;
  68 }
  69
  70 }  // namespace
  71
  72 namespace ash {
  73
  74 ///////////////////////////////////////////////////////////////////////////////
  75 // DefaultHeaderPainter, public:
  76
  77 DefaultHeaderPainter::DefaultHeaderPainter()
  78     : frame_(NULL),
  79       view_(NULL),
  80       left_header_view_(NULL),
  81       left_view_x_inset_(HeaderPainterUtil::GetDefaultLeftViewXInset()),
  82       active_frame_color_(kDefaultFrameColor),
  83       inactive_frame_color_(kDefaultFrameColor),
  84       caption_button_container_(NULL),
  85       height_(0),
  86       mode_(MODE_INACTIVE),
  87       initial_paint_(true),
  88       activation_animation_(new gfx::SlideAnimation(this)) {
  89 }
  90
  91 DefaultHeaderPainter::~DefaultHeaderPainter() {
  92 }
  93
  94 void DefaultHeaderPainter::Init(
  95     views::Widget* frame,
  96     views::View* header_view,
  97     FrameCaptionButtonContainerView* caption_button_container) {
  98   DCHECK(frame);
  99   DCHECK(header_view);
 100   DCHECK(caption_button_container);
 101   frame_ = frame;
 102   view_ = header_view;
 103   caption_button_container_ = caption_button_container;
 104   UpdateAllButtonImages();
 105 }
 106
 107 int DefaultHeaderPainter::GetMinimumHeaderWidth() const {
 108   // Ensure we have enough space for the window icon and buttons. We allow
 109   // the title string to collapse to zero width.
 110   return GetTitleBounds().x() +
 111       caption_button_container_->GetMinimumSize().width();
 112 }
 113
 114 void DefaultHeaderPainter::PaintHeader(gfx::Canvas* canvas, Mode mode) {
 115   Mode old_mode = mode_;
 116   mode_ = mode;
 117
 118   if (mode_ != old_mode) {
 119     UpdateAllButtonImages();
 120     if (!initial_paint_ && HeaderPainterUtil::CanAnimateActivation(frame_)) {
 121       activation_animation_->SetSlideDuration(kActivationCrossfadeDurationMs);
 122       if (mode_ == MODE_ACTIVE)
 123         activation_animation_->Show();
 124       else
 125         activation_animation_->Hide();
 126     } else {
 127       if (mode_ == MODE_ACTIVE)
 128         activation_animation_->Reset(1);
 129       else
 130         activation_animation_->Reset(0);
 131     }
 132     initial_paint_ = false;
 133   }
 134
 135   int corner_radius = (frame_->IsMaximized() || frame_->IsFullscreen()) ?
 136       0 : HeaderPainterUtil::GetTopCornerRadiusWhenRestored();
 137
 138   SkPaint paint;
 139   int active_alpha = activation_animation_->CurrentValueBetween(0, 255);
 140   paint.setColor(color_utils::AlphaBlend(active_frame_color_,
 141                                          inactive_frame_color_, active_alpha));
 142
 143   TileRoundRect(canvas, paint, GetLocalBounds(), corner_radius);
 144
 145   if (!frame_->IsMaximized() && !frame_->IsFullscreen() &&
 146       mode_ == MODE_INACTIVE && !UsesCustomFrameColors()) {
 147     PaintHighlightForInactiveRestoredWindow(canvas);
 148   }
 149   if (frame_->widget_delegate() &&
 150       frame_->widget_delegate()->ShouldShowWindowTitle()) {
 151     PaintTitleBar(canvas);
 152   }
 153   if (!UsesCustomFrameColors())
 154     PaintHeaderContentSeparator(canvas);
 155 }
 156
 157 void DefaultHeaderPainter::LayoutHeader() {
 158   UpdateSizeButtonImages(ShouldUseLightImages());
 159   caption_button_container_->Layout();
 160
 161   gfx::Size caption_button_container_size =
 162       caption_button_container_->GetPreferredSize();
 163   caption_button_container_->SetBounds(
 164       view_->width() - caption_button_container_size.width(),
 165       0,
 166       caption_button_container_size.width(),
 167       caption_button_container_size.height());
 168
 169   LayoutLeftHeaderView();
 170
 171   // The header/content separator line overlays the caption buttons.
 172   SetHeaderHeightForPainting(caption_button_container_->height());
 173 }
 174
 175 int DefaultHeaderPainter::GetHeaderHeightForPainting() const {
 176   return height_;
 177 }
 178
 179 void DefaultHeaderPainter::SetHeaderHeightForPainting(int height) {
 180   height_ = height;
 181 }
 182
 183 void DefaultHeaderPainter::SchedulePaintForTitle() {
 184   view_->SchedulePaintInRect(GetTitleBounds());
 185 }
 186
 187 void DefaultHeaderPainter::UpdateLeftViewXInset(int left_view_x_inset) {
 188   if (left_view_x_inset_ != left_view_x_inset) {
 189     left_view_x_inset_ = left_view_x_inset;
 190     LayoutLeftHeaderView();
 191   }
 192 }
 193
 194 void DefaultHeaderPainter::SetFrameColors(SkColor active_frame_color,
 195                                           SkColor inactive_frame_color) {
 196   active_frame_color_ = active_frame_color;
 197   inactive_frame_color_ = inactive_frame_color;
 198   UpdateAllButtonImages();
 199 }
 200
 201 void DefaultHeaderPainter::UpdateLeftHeaderView(views::View* left_header_view) {
 202   left_header_view_ = left_header_view;
 203 }
 204
 205 ///////////////////////////////////////////////////////////////////////////////
 206 // gfx::AnimationDelegate overrides:
 207
 208 void DefaultHeaderPainter::AnimationProgressed(
 209     const gfx::Animation* animation) {
 210   view_->SchedulePaintInRect(GetLocalBounds());
 211 }
 212
 213 ///////////////////////////////////////////////////////////////////////////////
 214 // DefaultHeaderPainter, private:
 215
 216 void DefaultHeaderPainter::PaintHighlightForInactiveRestoredWindow(
 217     gfx::Canvas* canvas) {
 218   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
 219   gfx::ImageSkia top_edge = *rb.GetImageSkiaNamed(
 220       IDR_AURA_WINDOW_HEADER_SHADE_INACTIVE_TOP);
 221   gfx::ImageSkia left_edge = *rb.GetImageSkiaNamed(
 222       IDR_AURA_WINDOW_HEADER_SHADE_INACTIVE_LEFT);
 223   gfx::ImageSkia right_edge = *rb.GetImageSkiaNamed(
 224       IDR_AURA_WINDOW_HEADER_SHADE_INACTIVE_RIGHT);
 225   gfx::ImageSkia bottom_edge = *rb.GetImageSkiaNamed(
 226       IDR_AURA_WINDOW_HEADER_SHADE_INACTIVE_BOTTOM);
 227
 228   int left_edge_width = left_edge.width();
 229   int right_edge_width = right_edge.width();
 230   canvas->DrawImageInt(left_edge, 0, 0);
 231   canvas->DrawImageInt(right_edge, view_->width() - right_edge_width, 0);
 232   canvas->TileImageInt(
 233       top_edge,
 234       left_edge_width,
 235       0,
 236       view_->width() - left_edge_width - right_edge_width,
 237       top_edge.height());
 238
 239   DCHECK_EQ(left_edge.height(), right_edge.height());
 240   int bottom = left_edge.height();
 241   int bottom_height = bottom_edge.height();
 242   canvas->TileImageInt(
 243       bottom_edge,
 244       left_edge_width,
 245       bottom - bottom_height,
 246       view_->width() - left_edge_width - right_edge_width,
 247       bottom_height);
 248 }
 249
 250 void DefaultHeaderPainter::PaintTitleBar(gfx::Canvas* canvas) {
 251   // The window icon is painted by its own views::View.
 252   gfx::Rect title_bounds = GetTitleBounds();
 253   title_bounds.set_x(view_->GetMirroredXForRect(title_bounds));
 254   canvas->DrawStringRectWithFlags(frame_->widget_delegate()->GetWindowTitle(),
 255                                   GetTitleFontList(),
 256                                   kTitleTextColor,
 257                                   title_bounds,
 258                                   gfx::Canvas::NO_SUBPIXEL_RENDERING);
 259 }
 260
 261 void DefaultHeaderPainter::PaintHeaderContentSeparator(gfx::Canvas* canvas) {
 262   SkColor color = (mode_ == MODE_ACTIVE) ?
 263       kHeaderContentSeparatorColor :
 264       kHeaderContentSeparatorInactiveColor;
 265
 266   SkPaint paint;
 267   paint.setColor(color);
 268   // Draw the line as 1px thick regardless of scale factor.
 269   paint.setStrokeWidth(0);
 270
 271   float thickness = 1 / canvas->image_scale();
 272   SkScalar y = SkIntToScalar(height_) - SkFloatToScalar(thickness);
 273   canvas->sk_canvas()->drawLine(0, y, SkIntToScalar(view_->width()), y, paint);
 274 }
 275
 276 void DefaultHeaderPainter::LayoutLeftHeaderView() {
 277   if (left_header_view_) {
 278     // Vertically center the left header view with respect to the caption button
 279     // container.
 280     // Floor when computing the center of |caption_button_container_|.
 281     gfx::Size size = left_header_view_->GetPreferredSize();
 282     int icon_offset_y = caption_button_container_->height() / 2 -
 283                         size.height() / 2;
 284     left_header_view_->SetBounds(
 285         left_view_x_inset_, icon_offset_y, size.width(), size.height());
 286   }
 287 }
 288
 289 bool DefaultHeaderPainter::ShouldUseLightImages() {
 290   int luminance = color_utils::GetLuminanceForColor(
 291       mode_ == MODE_INACTIVE ? inactive_frame_color_ : active_frame_color_);
 292   return luminance < kMaxLuminanceForLightButtons;
 293 }
 294
 295 void DefaultHeaderPainter::UpdateAllButtonImages() {
 296   bool use_light_images = ShouldUseLightImages();
 297   caption_button_container_->SetButtonImages(
 298       CAPTION_BUTTON_ICON_MINIMIZE,
 299       use_light_images ? IDR_AURA_WINDOW_CONTROL_ICON_MINIMIZE_WHITE
 300                        : IDR_AURA_WINDOW_CONTROL_ICON_MINIMIZE,
 301       IDR_AURA_WINDOW_CONTROL_BACKGROUND_H,
 302       IDR_AURA_WINDOW_CONTROL_BACKGROUND_P);
 303
 304   UpdateSizeButtonImages(use_light_images);
 305
 306   caption_button_container_->SetButtonImages(
 307       CAPTION_BUTTON_ICON_CLOSE,
 308       use_light_images ? IDR_AURA_WINDOW_CONTROL_ICON_CLOSE_WHITE
 309                        : IDR_AURA_WINDOW_CONTROL_ICON_CLOSE,
 310       IDR_AURA_WINDOW_CONTROL_BACKGROUND_H,
 311       IDR_AURA_WINDOW_CONTROL_BACKGROUND_P);
 312
 313   caption_button_container_->SetButtonImages(
 314       CAPTION_BUTTON_ICON_LEFT_SNAPPED,
 315       use_light_images ? IDR_AURA_WINDOW_CONTROL_ICON_LEFT_SNAPPED_WHITE
 316                        : IDR_AURA_WINDOW_CONTROL_ICON_LEFT_SNAPPED,
 317       IDR_AURA_WINDOW_CONTROL_BACKGROUND_H,
 318       IDR_AURA_WINDOW_CONTROL_BACKGROUND_P);
 319
 320   caption_button_container_->SetButtonImages(
 321       CAPTION_BUTTON_ICON_RIGHT_SNAPPED,
 322       use_light_images ? IDR_AURA_WINDOW_CONTROL_ICON_RIGHT_SNAPPED_WHITE
 323                        : IDR_AURA_WINDOW_CONTROL_ICON_RIGHT_SNAPPED,
 324       IDR_AURA_WINDOW_CONTROL_BACKGROUND_H,
 325       IDR_AURA_WINDOW_CONTROL_BACKGROUND_P);
 326 }
 327
 328 void DefaultHeaderPainter::UpdateSizeButtonImages(bool use_light_images) {
 329   int icon_id = 0;
 330   if (frame_->IsMaximized() || frame_->IsFullscreen()) {
 331     icon_id = use_light_images ? IDR_AURA_WINDOW_CONTROL_ICON_RESTORE_WHITE
 332                                : IDR_AURA_WINDOW_CONTROL_ICON_RESTORE;
 333   } else {
 334     icon_id = use_light_images ? IDR_AURA_WINDOW_CONTROL_ICON_MAXIMIZE_WHITE
 335                                : IDR_AURA_WINDOW_CONTROL_ICON_MAXIMIZE;
 336   }
 337   caption_button_container_->SetButtonImages(
 338       CAPTION_BUTTON_ICON_MAXIMIZE_RESTORE,
 339       icon_id,
 340       IDR_AURA_WINDOW_CONTROL_BACKGROUND_H,
 341       IDR_AURA_WINDOW_CONTROL_BACKGROUND_P);
 342 }
 343
 344 gfx::Rect DefaultHeaderPainter::GetLocalBounds() const {
 345   return gfx::Rect(view_->width(), height_);
 346 }
 347
 348 gfx::Rect DefaultHeaderPainter::GetTitleBounds() const {
 349   return HeaderPainterUtil::GetTitleBounds(
 350       left_header_view_, caption_button_container_, GetTitleFontList());
 351 }
 352
 353 bool DefaultHeaderPainter::UsesCustomFrameColors() const {
 354   return active_frame_color_ != kDefaultFrameColor ||
 355          inactive_frame_color_ != kDefaultFrameColor;
 356 }
 357
 358 }  // namespace ash