ash: First pass of Applist v2.

ash/app_list/app_list_bubble_border.cc

+// Copyright (c) 2012 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/app_list/app_list_bubble_border.h"
+
+#include "third_party/skia/include/core/SkPath.h"
+#include "third_party/skia/include/core/SkPaint.h"
+#include "third_party/skia/include/effects/SkBlurDrawLooper.h"
+#include "third_party/skia/include/effects/SkGradientShader.h"
+#include "ui/gfx/canvas.h"
+
+namespace {
+
+const int kCornerRadius = 3;
+
+const int kArrowHeight = 10;
+const int kArrowWidth = 20;
+
+const SkColor kBorderColor = SkColorSetARGB(0xFF, 0, 0, 0);
+const int kBorderSize = 1;
+
+const SkColor kShadowColor = SkColorSetARGB(0xFF, 0, 0, 0);
+const int kShadowRadius = 4;
+
+const SkColor kModelViewGradientColor1 = SkColorSetARGB(0xFF, 0xFE, 0xFE, 0xFE);
+const SkColor kModelViewGradientColor2 = SkColorSetARGB(0xFF, 0xF8, 0xF8, 0xF8);
+const int kModelViewGradientSize = 10;
+
+const SkColor kFooterBorderGradientColor1 =
+    SkColorSetARGB(0xFF, 0xA0, 0xA0, 0xA0);
+const SkColor kFooterBorderGradientColor2 =
+    SkColorSetARGB(0xFF, 0xD4, 0xD4, 0xD4);
+const int kFooterBorderSize = 3;
+const SkColor kFooterBackground = SkColorSetARGB(0xFF, 0xDC, 0xDC, 0xDC);
+
+// TODO(xiyuan): Merge this with the one in skia_util.
+SkShader* CreateVerticalGradientShader(int start_point,
+                                       int end_point,
+                                       SkColor start_color,
+                                       SkColor end_color,
+                                       SkShader::TileMode mode) {
+  SkColor grad_colors[2] = { start_color, end_color};
+  SkPoint grad_points[2];
+  grad_points[0].iset(0, start_point);
+  grad_points[1].iset(0, end_point);
+
+  return SkGradientShader::CreateLinear(grad_points,
+                                        grad_colors,
+                                        NULL,
+                                        2,
+                                        mode);
+}
+
+// Builds a bubble shape for given |bounds|.
+void BuildShape(const gfx::Rect& bounds,
+                SkScalar padding,
+                SkScalar arrow_offset,
+                SkPath* path) {
+  const SkScalar left = SkIntToScalar(bounds.x()) + padding;
+  const SkScalar top = SkIntToScalar(bounds.y()) + padding;
+  const SkScalar right = SkIntToScalar(bounds.right()) - padding;
+  const SkScalar bottom = SkIntToScalar(bounds.bottom()) - padding;
+
+  const SkScalar center_x = SkIntToScalar((bounds.x() + bounds.right()) / 2);
+  const SkScalar center_y = SkIntToScalar((bounds.y() + bounds.bottom()) / 2);
+
+  const SkScalar half_array_width = SkIntToScalar(kArrowWidth / 2);
+  const SkScalar arrow_height = SkIntToScalar(kArrowHeight) - padding;
+
+  path->reset();
+  path->incReserve(12);
+
+  path->moveTo(center_x, top);
+  path->arcTo(left, top, left, center_y, SkIntToScalar(kCornerRadius));
+  path->arcTo(left, bottom, center_x  - half_array_width, bottom,
+              SkIntToScalar(kCornerRadius));
+  path->lineTo(center_x + arrow_offset - half_array_width, bottom);
+  path->lineTo(center_x + arrow_offset, bottom + arrow_height);
+  path->lineTo(center_x + arrow_offset + half_array_width, bottom);
+  path->arcTo(right, bottom, right, center_y, SkIntToScalar(kCornerRadius));
+  path->arcTo(right, top, center_x, top, SkIntToScalar(kCornerRadius));
+  path->close();
+}
+
+}  // namespace
+
+namespace ash {
+
+AppListBubbleBorder::AppListBubbleBorder(views::View* app_list_view)
+    : views::BubbleBorder(views::BubbleBorder::BOTTOM_RIGHT,
+                          views::BubbleBorder::NO_SHADOW),
+      app_list_view_(app_list_view),
+      arrow_offset_(0) {
+}
+
+AppListBubbleBorder::~AppListBubbleBorder() {
+}
+
+void AppListBubbleBorder::PaintModelViewBackground(
+    gfx::Canvas* canvas,
+    const gfx::Rect& bounds) const {
+  const views::View* page_switcher = app_list_view_->child_at(1);
+  const gfx::Rect page_switcher_bounds =
+      app_list_view_->ConvertRectToWidget(page_switcher->bounds());
+  gfx::Rect rect(bounds.x(),
+                 bounds.y(),
+                 bounds.width(),
+                 page_switcher_bounds.y() - bounds.y());
+
+  SkPaint paint;
+  paint.setStyle(SkPaint::kFill_Style);
+  SkSafeUnref(paint.setShader(CreateVerticalGradientShader(
+      rect.y(),
+      rect.y() + kModelViewGradientSize,
+      kModelViewGradientColor1,
+      kModelViewGradientColor2,
+      SkShader::kClamp_TileMode)));
+  canvas->DrawRect(rect, paint);
+}
+
+void AppListBubbleBorder::PaintPageSwitcherBackground(
+    gfx::Canvas* canvas,
+    const gfx::Rect& bounds) const {
+  const views::View* page_switcher = app_list_view_->child_at(1);
+  const gfx::Rect page_switcher_bounds =
+      app_list_view_->ConvertRectToWidget(page_switcher->bounds());
+
+  gfx::Rect rect(bounds.x(),
+                 page_switcher_bounds.y(),
+                 bounds.width(),
+                 kFooterBorderSize);
+  SkPaint paint;
+  paint.setStyle(SkPaint::kFill_Style);
+  SkSafeUnref(paint.setShader(CreateVerticalGradientShader(
+      rect.y(),
+      rect.bottom(),
+      kFooterBorderGradientColor1,
+      kFooterBorderGradientColor2,
+      SkShader::kClamp_TileMode)));
+  canvas->DrawRect(rect, paint);
+
+  rect.set_y(rect.bottom());
+  rect.set_height(bounds.bottom() - rect.y() + kArrowHeight - kBorderSize);
+  canvas->FillRect(rect, kFooterBackground);
+}
+
+void AppListBubbleBorder::GetInsets(gfx::Insets* insets) const {
+  insets->Set(kShadowRadius + kBorderSize,
+              kShadowRadius + kBorderSize,
+              kShadowRadius + kBorderSize + kArrowHeight,
+              kShadowRadius + kBorderSize);
+}
+
+gfx::Rect AppListBubbleBorder::GetBounds(
+    const gfx::Rect& position_relative_to,
+    const gfx::Size& contents_size) const {
+  gfx::Size border_size(contents_size);
+  gfx::Insets insets;
+  GetInsets(&insets);
+  border_size.Enlarge(insets.width(), insets.height());
+
+  int anchor_x = (position_relative_to.x() + position_relative_to.right()) / 2;
+  int arrow_tip_x = border_size.width() / 2 + arrow_offset_;
+
+  return gfx::Rect(
+      gfx::Point(anchor_x - arrow_tip_x,
+                 position_relative_to.y() - border_size.height() +
+                     kShadowRadius),
+      border_size);
+}
+
+void AppListBubbleBorder::Paint(const views::View& view,
+                                gfx::Canvas* canvas) const {
+  gfx::Insets insets;
+  GetInsets(&insets);
+
+  gfx::Rect bounds = view.bounds();
+  bounds.Inset(insets);
+
+  SkPath path;
+
+  SkPaint paint;
+  paint.setAntiAlias(true);
+  paint.setStyle(SkPaint::kStroke_Style);
+  paint.setColor(kBorderColor);
+  SkSafeUnref(paint.setLooper(
+      new SkBlurDrawLooper(kShadowRadius,
+                           0, 0,
+                           kShadowColor,
+                           SkBlurDrawLooper::kHighQuality_BlurFlag)));
+  // Pads with 0.5 pixel since anti alias is used.
+  BuildShape(bounds,
+             SkDoubleToScalar(0.5),
+             SkIntToScalar(arrow_offset_),
+             &path);
+  canvas->DrawPath(path, paint);
+
+  // Pads with kBoprderSize pixels to leave space for border lines.
+  BuildShape(bounds,
+             SkIntToScalar(kBorderSize),
+             SkIntToScalar(arrow_offset_),
+             &path);
+  canvas->Save();
+  canvas->ClipPath(path);
+
+  PaintModelViewBackground(canvas, bounds);
+  PaintPageSwitcherBackground(canvas, bounds);
+
+  canvas->Restore();
+}
+
+}  // namespace ash