Convert InfoBubble to using BubbleBorder. This also replaces the border grap...

chrome/browser/views/bubble_border.cc

 // Copyright (c) 2009 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/views/bubble_border.h"
 
 #include "app/gfx/canvas.h"
 #include "app/gfx/path.h"
 #include "app/resource_bundle.h"
 #include "base/logging.h"
 #include "grit/theme_resources.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 
 // static
 SkBitmap* BubbleBorder::left_ = NULL;
 SkBitmap* BubbleBorder::top_left_ = NULL;
 SkBitmap* BubbleBorder::top_ = NULL;
 SkBitmap* BubbleBorder::top_right_ = NULL;
 SkBitmap* BubbleBorder::right_ = NULL;
 SkBitmap* BubbleBorder::bottom_right_ = NULL;
 SkBitmap* BubbleBorder::bottom_ = NULL;
 SkBitmap* BubbleBorder::bottom_left_ = NULL;
+SkBitmap* BubbleBorder::top_arrow_ = NULL;
+SkBitmap* BubbleBorder::bottom_arrow_ = NULL;
+
+//static
+int BubbleBorder::arrow_x_offset_;
+
+// The height inside the arrow image, in pixels.
+static const int kArrowInteriorHeight = 7;
 
 gfx::Rect BubbleBorder::GetBounds(const gfx::Rect& position_relative_to,
                                   const gfx::Size& contents_size) const {
   // The spacing (in pixels) between |position_relative_to| and the bubble
   // content.
   const int kBubbleSpacing = 2;
 
   // Desired size is size of contents enlarged by the size of the border images.
   gfx::Size border_size(contents_size);
   gfx::Insets insets;
   GetInsets(&insets);
   border_size.Enlarge(insets.left() + insets.right(),
                       insets.top() + insets.bottom());
 
-  int x = position_relative_to.x() + (position_relative_to.width() / 2) -
-      (contents_size.width() / 2) - insets.left();
-  int y = position_relative_to.bottom() - (top_->height() - kBubbleSpacing);
+  // Screen position depends on the arrow location.
+  int x = position_relative_to.x() + (position_relative_to.width() / 2);
+  if (arrow_is_left())
+    x -= arrow_x_offset_;
+  else if (arrow_location_ == NONE)
+    x -= ((contents_size.width() / 2) + insets.left());
+  else
+    x += (arrow_x_offset_ - border_size.width() + 1);
+  int y = position_relative_to.y();
+  if (arrow_is_top()) {
+    y += (position_relative_to.height() -
+        (top_arrow_->height() - kBubbleSpacing));
+  } else if (arrow_location_ == NONE) {
+    y += (position_relative_to.height() - (top_->height() - kBubbleSpacing));
+  } else {
+    y += ((bottom_arrow_->height() - kBubbleSpacing) - border_size.height());
+  }
 
   return gfx::Rect(x, y, border_size.width(), border_size.height());
 }
 
 void BubbleBorder::GetInsets(gfx::Insets* insets) const {
-  insets->Set(top_->height(), left_->width(), bottom_->height(),
-              right_->width());
+  int top = top_->height();
+  int bottom = bottom_->height();
+  if (arrow_is_top())
+    top = std::max(top, top_arrow_->height());
+  else if (arrow_location_ != NONE)
+    bottom = std::max(bottom, bottom_arrow_->height());
+  insets->Set(top, left_->width(), bottom, right_->width());
 }
 
 // static
 void BubbleBorder::InitClass() {
   static bool initialized = false;
   if (!initialized) {
     // Load images.
     ResourceBundle& rb = ResourceBundle::GetSharedInstance();
     left_ = rb.GetBitmapNamed(IDR_BUBBLE_L);
     top_left_ = rb.GetBitmapNamed(IDR_BUBBLE_TL);
     top_ = rb.GetBitmapNamed(IDR_BUBBLE_T);
     top_right_ = rb.GetBitmapNamed(IDR_BUBBLE_TR);
     right_ = rb.GetBitmapNamed(IDR_BUBBLE_R);
     bottom_right_ = rb.GetBitmapNamed(IDR_BUBBLE_BR);
     bottom_ = rb.GetBitmapNamed(IDR_BUBBLE_B);
     bottom_left_ = rb.GetBitmapNamed(IDR_BUBBLE_BL);
+    top_arrow_ = rb.GetBitmapNamed(IDR_BUBBLE_T_ARROW);
+    bottom_arrow_ = rb.GetBitmapNamed(IDR_BUBBLE_B_ARROW);
+
+    // Calculate horizontal inset for arrow by ensuring that the widest arrow
+    // and corner images will have enough room to avoid overlap.
+    arrow_x_offset_ =
+        (std::max(top_arrow_->width(), bottom_arrow_->width()) / 2) +
+        std::max(std::max(top_left_->width(), top_right_->width()),
+                 std::max(bottom_left_->width(), bottom_right_->width()));
 
     initialized = true;
   }
 }
 
 void BubbleBorder::Paint(const views::View& view, gfx::Canvas* canvas) const {
   // Convenience shorthand variables
   int width = view.width();
   int tl_width = top_left_->width();
   int tl_height = top_left_->height();
   int t_height = top_->height();
   int tr_width = top_right_->width();
   int tr_height = top_right_->height();
   int r_width = right_->width();
   int br_width = bottom_right_->width();
   int br_height = bottom_right_->height();
   int b_height = bottom_->height();
   int bl_width = bottom_left_->width();
   int bl_height = bottom_left_->height();
 
   /* The variables below can be confusing; here's what they mean:
    *
-   * border_top∙∙∙∙∙∙∙┌────┬────────┬────┐
-   *                  │  / │--------│ \  │
-   * top∙∙∙∙∙∙∙∙∙∙∙∙∙∙│ /  ├────────┤  \ │
-   *   tl_bottom∙∙∙∙∙∙├───┬┘        └┬───┤∙∙∙∙∙∙tr_bottom
-   *                  │ | │          │ | │
-   *                  │ | │          │ | │
-   *                  │ | │          │ | │
-   *   bl_y∙∙∙∙∙∙∙∙∙∙∙├───┴┐        ┌┴───┤∙∙∙∙∙∙br_y
-   * bottom∙∙∙∙∙∙∙∙∙∙∙│ \  ├────────┤  / │
-   *                  │  \ │--------│ /  │
-   * border_bottom∙∙∙∙└────┴────────┴────┘
+   * 0∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙┌───┐      ┌───┐
+   * border_top∙∙∙∙∙∙∙┌────┬─┤ ▲ ├──────┤ ▲ ├─┬────┐
+   *                  │  / │-│∙ ∙│------│∙ ∙│-│ \  │
+   * top∙∙∙∙∙∙∙∙∙∙∙∙∙∙│ /  ├─┴───┴──────┴───┴─┤  \ │
+   *   tl_bottom∙∙∙∙∙∙├───┬┘                  └┬───┤∙∙∙∙∙∙tr_bottom
+   *                  │ | │                    │ | │
+   *                  │ | │                    │ | │
+   *                  │ | │                    │ | │
+   *   bl_y∙∙∙∙∙∙∙∙∙∙∙├───┴┐                  ┌┴───┤∙∙∙∙∙∙br_y
+   * bottom∙∙∙∙∙∙∙∙∙∙∙│ \  ├─┬───┬──────┬───┬─┤  / │
+   *                  │  \ │-│. .│------│. .│-│ /  │
+   * border_bottom∙∙∙∙└────┴─┤ ▼ ├──────┤ ▼ ├─┴────┘
+   * view.height()∙∙∙∙∙∙∙∙∙∙∙└───┘      └───┘
+   *
+   *           (At most one of the arrows will be drawn)
    */
 
   gfx::Insets insets;
   GetInsets(&insets);
   int top = insets.top();
   int border_top = top - t_height;
   int tl_bottom = border_top + tl_height;
   int tr_bottom = border_top + tr_height;
   int bottom = view.height() - insets.bottom();
   int border_bottom = bottom + b_height;
   int bl_y = border_bottom - bl_height;
   int br_y = border_bottom - br_height;
 
   // Top left corner
   canvas->DrawBitmapInt(*top_left_, 0, border_top);
 
-  // Top edge
-  canvas->TileImageInt(*top_, tl_width, border_top, width - tl_width - tr_width,
-                       t_height);
-
   // Top right corner
   canvas->DrawBitmapInt(*top_right_, width - tr_width, border_top);
 
   // Right edge
   canvas->TileImageInt(*right_, width - r_width, tr_bottom, r_width,
                        br_y - tr_bottom);
 
   // Bottom right corner
   canvas->DrawBitmapInt(*bottom_right_, width - br_width, br_y);
 
-  // Bottom edge
-  canvas->TileImageInt(*bottom_, bl_width, bottom, width - bl_width - br_width,
-                       b_height);
 
   // Bottom left corner
   canvas->DrawBitmapInt(*bottom_left_, 0, bl_y);
 
   // Left edge
   canvas->TileImageInt(*left_, 0, tl_bottom, left_->width(), bl_y - tl_bottom);
+
+  // Arrow edge, if necessary
+  bool should_draw_top_edge = true;
+  bool should_draw_bottom_edge = true;
+  if (arrow_location_ != NONE) {
+    /* Here's what the variables below mean (without loss of generality):
+     *
+     *                    arrow_center
+     *                 arrow_x │ arrow_r
+     *                       │ │ │
+     * left_of_edge─┬────┐   │ │ │       ┌────┬─right_of_edge
+     * arrow_y∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙┌───┐
+     * edge_y∙∙∙∙∙∙∙┌────┬───┤ ▲ ├───────┬────┐  ┐
+     *              │  / │---│∙ ∙│-------│ \  │  ├─e_height
+     *              │ /  ├───┴───┴───────┤  \ │  ┘
+     *              ├───┬┘               └┬───┤
+     *              |   |    └─┬─┘        |   |
+     *              ∙   ∙└─┬─┘ │ └───┬───┘∙   ∙
+     *       left_of_arrow─┘   │     └─right_of_arrow
+     *                    arrow_width
+     *
+     * Not shown: border_y and tip_y contain the base and tip coordinates inside
+     * the arrow for use filling the arrow interior with the background color.
+     */
+
+    SkBitmap* edge;
+    SkBitmap* arrow;
+    int left_of_edge, right_of_edge, edge_y, arrow_y;
+    SkScalar border_y, tip_y;
+    if (arrow_is_top()) {
+      should_draw_top_edge = false;
+      edge = top_;
+      arrow = top_arrow_;
+      left_of_edge = tl_width;
+      right_of_edge = tr_width;
+      edge_y = border_top;
+      arrow_y = top - top_arrow_->height();
+      border_y = SkIntToScalar(top);
+      tip_y = SkIntToScalar(top - kArrowInteriorHeight);
+    } else {
+      should_draw_bottom_edge = false;
+      edge = bottom_;
+      arrow = bottom_arrow_;
+      left_of_edge = bl_width;
+      right_of_edge = br_width;
+      edge_y = arrow_y = bottom;
+      border_y = SkIntToScalar(bottom);
+      tip_y = SkIntToScalar(bottom + kArrowInteriorHeight);
+    }
+    int arrow_width = (arrow_is_top() ? top_arrow_ : bottom_arrow_)->width();
+    int arrow_center = arrow_is_left() ?
+        arrow_x_offset_ : width - arrow_x_offset_ - 1;
+    int arrow_x = arrow_center - (arrow_width / 2);
+    SkScalar arrow_interior_x =
+        SkIntToScalar(arrow_center - kArrowInteriorHeight);
+    SkScalar arrow_interior_r =
+        SkIntToScalar(arrow_center + kArrowInteriorHeight);
+    int arrow_r = arrow_x + arrow_width;
+    int e_height = edge->height();
+
+    // Edge to the left of the arrow
+    int left_of_arrow = arrow_x - left_of_edge;
+    if (left_of_arrow) {
+      canvas->TileImageInt(*edge, left_of_edge, edge_y, left_of_arrow,
+                           e_height);
+    }
+
+    // Interior of the arrow (filled with background color)
+    SkPaint paint;
+    paint.setStyle(SkPaint::kFill_Style);
+    paint.setColor(background_color_);
+    gfx::Path path;
+    path.incReserve(4);
+    path.moveTo(arrow_interior_x, border_y);
+    path.lineTo(SkIntToScalar(arrow_center), tip_y);
+    path.lineTo(arrow_interior_r, border_y);
+    path.close();
+    canvas->drawPath(path, paint);
+
+    // Arrow border
+    canvas->DrawBitmapInt(*arrow, arrow_x, arrow_y);
+
+    // Edge to the right of the arrow
+    int right_of_arrow = width - arrow_r - right_of_edge;
+    if (right_of_arrow)
+      canvas->TileImageInt(*edge, arrow_r, edge_y, right_of_arrow, e_height);
+  }
+
+  // Top edge, if not already drawn
+  if (should_draw_top_edge) {
+    canvas->TileImageInt(*top_, tl_width, border_top,
+                         width - tl_width - tr_width, t_height);
+  }
+
+  // Bottom edge, if not already drawn
+  if (should_draw_bottom_edge) {
+    canvas->TileImageInt(*bottom_, bl_width, bottom,
+                         width - bl_width - br_width, b_height);
+  }
 }