src/ui/views/bubble/bubble_border.cc

   1 // Copyright (c) 2012 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 "ui/views/bubble/bubble_border.h"
   6
   7 #include <algorithm>
   8
   9 #include "base/logging.h"
  10 #include "grit/ui_resources.h"
  11 #include "ui/base/resource/resource_bundle.h"
  12 #include "ui/gfx/canvas.h"
  13 #include "ui/gfx/rect.h"
  14 #include "ui/gfx/skia_util.h"
  15 #include "ui/views/painter.h"
  16 #include "ui/views/view.h"
  17
  18 namespace views {
  19
  20 namespace internal {
  21
  22 BorderImages::BorderImages(const int border_image_ids[],
  23                            const int arrow_image_ids[],
  24                            int border_interior_thickness,
  25                            int arrow_interior_thickness,
  26                            int corner_radius)
  27     : border_painter(Painter::CreateImageGridPainter(border_image_ids)),
  28       border_thickness(0),
  29       border_interior_thickness(border_interior_thickness),
  30       arrow_thickness(0),
  31       arrow_interior_thickness(arrow_interior_thickness),
  32       corner_radius(corner_radius) {
  33   ResourceBundle& rb = ResourceBundle::GetSharedInstance();
  34   border_thickness = rb.GetImageSkiaNamed(border_image_ids[0])->width();
  35   if (arrow_image_ids[0] != 0) {
  36     left_arrow = *rb.GetImageSkiaNamed(arrow_image_ids[0]);
  37     top_arrow = *rb.GetImageSkiaNamed(arrow_image_ids[1]);
  38     right_arrow = *rb.GetImageSkiaNamed(arrow_image_ids[2]);
  39     bottom_arrow = *rb.GetImageSkiaNamed(arrow_image_ids[3]);
  40     arrow_thickness = top_arrow.height();
  41   }
  42 }
  43
  44 BorderImages::~BorderImages() {}
  45
  46 }  // namespace internal
  47
  48 namespace {
  49
  50 // Bubble border and arrow image resource ids. They don't use the IMAGE_GRID
  51 // macro because there is no center image.
  52 const int kNoShadowImages[] = {
  53     IDR_BUBBLE_TL, IDR_BUBBLE_T, IDR_BUBBLE_TR,
  54     IDR_BUBBLE_L,  0,            IDR_BUBBLE_R,
  55     IDR_BUBBLE_BL, IDR_BUBBLE_B, IDR_BUBBLE_BR };
  56 const int kNoShadowArrows[] = {
  57     IDR_BUBBLE_L_ARROW, IDR_BUBBLE_T_ARROW,
  58     IDR_BUBBLE_R_ARROW, IDR_BUBBLE_B_ARROW, };
  59
  60 const int kBigShadowImages[] = {
  61     IDR_WINDOW_BUBBLE_SHADOW_BIG_TOP_LEFT,
  62     IDR_WINDOW_BUBBLE_SHADOW_BIG_TOP,
  63     IDR_WINDOW_BUBBLE_SHADOW_BIG_TOP_RIGHT,
  64     IDR_WINDOW_BUBBLE_SHADOW_BIG_LEFT,
  65     0,
  66     IDR_WINDOW_BUBBLE_SHADOW_BIG_RIGHT,
  67     IDR_WINDOW_BUBBLE_SHADOW_BIG_BOTTOM_LEFT,
  68     IDR_WINDOW_BUBBLE_SHADOW_BIG_BOTTOM,
  69     IDR_WINDOW_BUBBLE_SHADOW_BIG_BOTTOM_RIGHT };
  70 const int kBigShadowArrows[] = {
  71     IDR_WINDOW_BUBBLE_SHADOW_SPIKE_BIG_LEFT,
  72     IDR_WINDOW_BUBBLE_SHADOW_SPIKE_BIG_TOP,
  73     IDR_WINDOW_BUBBLE_SHADOW_SPIKE_BIG_RIGHT,
  74     IDR_WINDOW_BUBBLE_SHADOW_SPIKE_BIG_BOTTOM };
  75
  76 const int kSmallShadowImages[] = {
  77     IDR_WINDOW_BUBBLE_SHADOW_SMALL_TOP_LEFT,
  78     IDR_WINDOW_BUBBLE_SHADOW_SMALL_TOP,
  79     IDR_WINDOW_BUBBLE_SHADOW_SMALL_TOP_RIGHT,
  80     IDR_WINDOW_BUBBLE_SHADOW_SMALL_LEFT,
  81     0,
  82     IDR_WINDOW_BUBBLE_SHADOW_SMALL_RIGHT,
  83     IDR_WINDOW_BUBBLE_SHADOW_SMALL_BOTTOM_LEFT,
  84     IDR_WINDOW_BUBBLE_SHADOW_SMALL_BOTTOM,
  85     IDR_WINDOW_BUBBLE_SHADOW_SMALL_BOTTOM_RIGHT };
  86 const int kSmallShadowArrows[] = {
  87     IDR_WINDOW_BUBBLE_SHADOW_SPIKE_SMALL_LEFT,
  88     IDR_WINDOW_BUBBLE_SHADOW_SPIKE_SMALL_TOP,
  89     IDR_WINDOW_BUBBLE_SHADOW_SPIKE_SMALL_RIGHT,
  90     IDR_WINDOW_BUBBLE_SHADOW_SPIKE_SMALL_BOTTOM };
  91
  92 using internal::BorderImages;
  93
  94 // Returns the cached BorderImages for the given |shadow| type.
  95 BorderImages* GetBorderImages(BubbleBorder::Shadow shadow) {
  96   // Keep a cache of bubble border image-set painters, arrows, and metrics.
  97   static BorderImages* kBorderImages[BubbleBorder::SHADOW_COUNT] = { NULL };
  98
  99   CHECK_LT(shadow, BubbleBorder::SHADOW_COUNT);
 100   struct BorderImages*& set = kBorderImages[shadow];
 101   if (set)
 102     return set;
 103
 104   switch (shadow) {
 105     case BubbleBorder::NO_SHADOW:
 106     case BubbleBorder::NO_SHADOW_OPAQUE_BORDER:
 107       set = new BorderImages(kNoShadowImages, kNoShadowArrows, 6, 7, 4);
 108       break;
 109     case BubbleBorder::BIG_SHADOW:
 110       set = new BorderImages(kBigShadowImages, kBigShadowArrows, 23, 9, 2);
 111       break;
 112     case BubbleBorder::SMALL_SHADOW:
 113       set = new BorderImages(kSmallShadowImages, kSmallShadowArrows, 5, 6, 2);
 114       break;
 115     case BubbleBorder::SHADOW_COUNT:
 116       NOTREACHED();
 117       break;
 118   }
 119
 120   return set;
 121 }
 122
 123 }  // namespace
 124
 125 const int BubbleBorder::kStroke = 1;
 126
 127 BubbleBorder::BubbleBorder(Arrow arrow, Shadow shadow, SkColor color)
 128     : arrow_(arrow),
 129       arrow_offset_(0),
 130       arrow_paint_type_(PAINT_NORMAL),
 131       alignment_(ALIGN_ARROW_TO_MID_ANCHOR),
 132       shadow_(shadow),
 133       background_color_(color),
 134       use_theme_background_color_(false) {
 135   DCHECK(shadow < SHADOW_COUNT);
 136   images_ = GetBorderImages(shadow);
 137 }
 138
 139 BubbleBorder::~BubbleBorder() {}
 140
 141 gfx::Rect BubbleBorder::GetBounds(const gfx::Rect& anchor_rect,
 142                                   const gfx::Size& contents_size) const {
 143   int x = anchor_rect.x();
 144   int y = anchor_rect.y();
 145   int w = anchor_rect.width();
 146   int h = anchor_rect.height();
 147   const gfx::Size size(GetSizeForContentsSize(contents_size));
 148   const int arrow_offset = GetArrowOffset(size);
 149   const int arrow_size =
 150       images_->arrow_interior_thickness + kStroke - images_->arrow_thickness;
 151   const bool mid_anchor = alignment_ == ALIGN_ARROW_TO_MID_ANCHOR;
 152
 153   // Calculate the bubble coordinates based on the border and arrow settings.
 154   if (is_arrow_on_horizontal(arrow_)) {
 155     if (is_arrow_on_left(arrow_)) {
 156       x += mid_anchor ? w / 2 - arrow_offset : kStroke - GetBorderThickness();
 157     } else if (is_arrow_at_center(arrow_)) {
 158       x += w / 2 - arrow_offset;
 159     } else {
 160       x += mid_anchor ? w / 2 + arrow_offset - size.width() :
 161                         w - size.width() + GetBorderThickness() - kStroke;
 162     }
 163     y += is_arrow_on_top(arrow_) ? h + arrow_size : -arrow_size - size.height();
 164   } else if (has_arrow(arrow_)) {
 165     x += is_arrow_on_left(arrow_) ? w + arrow_size : -arrow_size - size.width();
 166     if (is_arrow_on_top(arrow_)) {
 167       y += mid_anchor ? h / 2 - arrow_offset : kStroke - GetBorderThickness();
 168     } else if (is_arrow_at_center(arrow_)) {
 169       y += h / 2 - arrow_offset;
 170     } else {
 171       y += mid_anchor ? h / 2 + arrow_offset - size.height() :
 172                         h - size.height() + GetBorderThickness() - kStroke;
 173     }
 174   } else {
 175     x += (w - size.width()) / 2;
 176     y += (arrow_ == NONE) ? h : (h - size.height()) / 2;
 177   }
 178
 179   return gfx::Rect(x, y, size.width(), size.height());
 180 }
 181
 182 int BubbleBorder::GetBorderThickness() const {
 183   return images_->border_thickness - images_->border_interior_thickness;
 184 }
 185
 186 int BubbleBorder::GetBorderCornerRadius() const {
 187   return images_->corner_radius;
 188 }
 189
 190 int BubbleBorder::GetArrowOffset(const gfx::Size& border_size) const {
 191   const int edge_length = is_arrow_on_horizontal(arrow_) ?
 192       border_size.width() : border_size.height();
 193   if (is_arrow_at_center(arrow_) && arrow_offset_ == 0)
 194     return edge_length / 2;
 195
 196   // Calculate the minimum offset to not overlap arrow and corner images.
 197   const int min = images_->border_thickness + (images_->top_arrow.width() / 2);
 198   // Ensure the returned value will not cause image overlap, if possible.
 199   return std::max(min, std::min(arrow_offset_, edge_length - min));
 200 }
 201
 202 void BubbleBorder::Paint(const views::View& view, gfx::Canvas* canvas) {
 203   gfx::Rect bounds(view.GetContentsBounds());
 204   bounds.Inset(-GetBorderThickness(), -GetBorderThickness());
 205   const gfx::Rect arrow_bounds = GetArrowRect(view.GetLocalBounds());
 206   if (arrow_bounds.IsEmpty()) {
 207     Painter::PaintPainterAt(canvas, images_->border_painter.get(), bounds);
 208     return;
 209   }
 210
 211   // Clip the arrow bounds out to avoid painting the overlapping edge area.
 212   canvas->Save();
 213   SkRect arrow_rect(gfx::RectToSkRect(arrow_bounds));
 214   canvas->sk_canvas()->clipRect(arrow_rect, SkRegion::kDifference_Op);
 215   Painter::PaintPainterAt(canvas, images_->border_painter.get(), bounds);
 216   canvas->Restore();
 217
 218   DrawArrow(canvas, arrow_bounds);
 219 }
 220
 221 gfx::Insets BubbleBorder::GetInsets() const {
 222   // The insets contain the stroke and shadow pixels outside the bubble fill.
 223   const int inset = GetBorderThickness();
 224   if ((arrow_paint_type_ == PAINT_NONE) || !has_arrow(arrow_))
 225     return gfx::Insets(inset, inset, inset, inset);
 226
 227   int first_inset = inset;
 228   int second_inset = std::max(inset, images_->arrow_thickness);
 229   if (is_arrow_on_horizontal(arrow_) ?
 230       is_arrow_on_top(arrow_) : is_arrow_on_left(arrow_))
 231     std::swap(first_inset, second_inset);
 232   return is_arrow_on_horizontal(arrow_) ?
 233       gfx::Insets(first_inset, inset, second_inset, inset) :
 234       gfx::Insets(inset, first_inset, inset, second_inset);
 235 }
 236
 237 gfx::Size BubbleBorder::GetMinimumSize() const {
 238   return GetSizeForContentsSize(gfx::Size());
 239 }
 240
 241 gfx::Size BubbleBorder::GetSizeForContentsSize(
 242     const gfx::Size& contents_size) const {
 243   // Enlarge the contents size by the thickness of the border images.
 244   gfx::Size size(contents_size);
 245   const gfx::Insets insets = GetInsets();
 246   size.Enlarge(insets.width(), insets.height());
 247
 248   // Ensure the bubble is large enough to not overlap border and arrow images.
 249   const int min = 2 * images_->border_thickness;
 250   const int min_with_arrow_width = min + images_->top_arrow.width();
 251   const int min_with_arrow_thickness = images_->border_thickness +
 252       std::max(images_->arrow_thickness + images_->border_interior_thickness,
 253                images_->border_thickness);
 254   // Only take arrow image sizes into account when the bubble tip is shown.
 255   if (arrow_paint_type_ == PAINT_NONE || !has_arrow(arrow_))
 256     size.SetToMax(gfx::Size(min, min));
 257   else if (is_arrow_on_horizontal(arrow_))
 258     size.SetToMax(gfx::Size(min_with_arrow_width, min_with_arrow_thickness));
 259   else
 260     size.SetToMax(gfx::Size(min_with_arrow_thickness, min_with_arrow_width));
 261   return size;
 262 }
 263
 264 gfx::ImageSkia* BubbleBorder::GetArrowImage() const {
 265   if (!has_arrow(arrow_))
 266     return NULL;
 267   if (is_arrow_on_horizontal(arrow_)) {
 268     return is_arrow_on_top(arrow_) ?
 269         &images_->top_arrow : &images_->bottom_arrow;
 270   }
 271   return is_arrow_on_left(arrow_) ?
 272       &images_->left_arrow : &images_->right_arrow;
 273 }
 274
 275 gfx::Rect BubbleBorder::GetArrowRect(const gfx::Rect& bounds) const {
 276   if (!has_arrow(arrow_) || arrow_paint_type_ != PAINT_NORMAL)
 277     return gfx::Rect();
 278
 279   gfx::Point origin;
 280   int offset = GetArrowOffset(bounds.size());
 281   const int half_length = images_->top_arrow.width() / 2;
 282   const gfx::Insets insets = GetInsets();
 283
 284   if (is_arrow_on_horizontal(arrow_)) {
 285     origin.set_x(is_arrow_on_left(arrow_) || is_arrow_at_center(arrow_) ?
 286         offset : bounds.width() - offset);
 287     origin.Offset(-half_length, 0);
 288     if (is_arrow_on_top(arrow_))
 289       origin.set_y(insets.top() - images_->arrow_thickness);
 290     else
 291       origin.set_y(bounds.height() - insets.bottom());
 292   } else {
 293     origin.set_y(is_arrow_on_top(arrow_)  || is_arrow_at_center(arrow_) ?
 294         offset : bounds.height() - offset);
 295     origin.Offset(0, -half_length);
 296     if (is_arrow_on_left(arrow_))
 297       origin.set_x(insets.left() - images_->arrow_thickness);
 298     else
 299       origin.set_x(bounds.width() - insets.right());
 300   }
 301   return gfx::Rect(origin, GetArrowImage()->size());
 302 }
 303
 304 void BubbleBorder::DrawArrow(gfx::Canvas* canvas,
 305                              const gfx::Rect& arrow_bounds) const {
 306   canvas->DrawImageInt(*GetArrowImage(), arrow_bounds.x(), arrow_bounds.y());
 307   const bool horizontal = is_arrow_on_horizontal(arrow_);
 308   const int thickness = images_->arrow_interior_thickness;
 309   float tip_x = horizontal ? arrow_bounds.CenterPoint().x() :
 310       is_arrow_on_left(arrow_) ? arrow_bounds.right() - thickness :
 311                                  arrow_bounds.x() + thickness;
 312   float tip_y = !horizontal ? arrow_bounds.CenterPoint().y() + 0.5f :
 313       is_arrow_on_top(arrow_) ? arrow_bounds.bottom() - thickness :
 314                                 arrow_bounds.y() + thickness;
 315   const bool positive_offset = horizontal ?
 316       is_arrow_on_top(arrow_) : is_arrow_on_left(arrow_);
 317   const int offset_to_next_vertex = positive_offset ?
 318       images_->arrow_interior_thickness : -images_->arrow_interior_thickness;
 319
 320   SkPath path;
 321   path.incReserve(4);
 322   path.moveTo(SkDoubleToScalar(tip_x), SkDoubleToScalar(tip_y));
 323   path.lineTo(SkDoubleToScalar(tip_x + offset_to_next_vertex),
 324               SkDoubleToScalar(tip_y + offset_to_next_vertex));
 325   const int multiplier = horizontal ? 1 : -1;
 326   path.lineTo(SkDoubleToScalar(tip_x - multiplier * offset_to_next_vertex),
 327               SkDoubleToScalar(tip_y + multiplier * offset_to_next_vertex));
 328   path.close();
 329
 330   SkPaint paint;
 331   paint.setStyle(SkPaint::kFill_Style);
 332   paint.setColor(background_color_);
 333
 334   canvas->DrawPath(path, paint);
 335 }
 336
 337 internal::BorderImages* BubbleBorder::GetImagesForTest() const {
 338   return images_;
 339 }
 340
 341 void BubbleBackground::Paint(gfx::Canvas* canvas, views::View* view) const {
 342   if (border_->shadow() == BubbleBorder::NO_SHADOW_OPAQUE_BORDER)
 343     canvas->DrawColor(border_->background_color());
 344
 345   // Fill the contents with a round-rect region to match the border images.
 346   SkPaint paint;
 347   paint.setAntiAlias(true);
 348   paint.setStyle(SkPaint::kFill_Style);
 349   paint.setColor(border_->background_color());
 350   SkPath path;
 351   gfx::Rect bounds(view->GetLocalBounds());
 352   bounds.Inset(border_->GetInsets());
 353
 354   SkScalar radius = SkIntToScalar(border_->GetBorderCornerRadius());
 355   path.addRoundRect(gfx::RectToSkRect(bounds), radius, radius);
 356   canvas->DrawPath(path, paint);
 357 }
 358
 359 }  // namespace views