ash: First pass of Applist v2.

ash/app_list/page_switcher.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/page_switcher.h"
+
+#include "ash/app_list/pagination_model.h"
+#include "third_party/skia/include/core/SkPath.h"
+#include "ui/base/animation/throb_animation.h"
+#include "ui/gfx/canvas.h"
+#include "ui/views/controls/button/custom_button.h"
+#include "ui/views/layout/box_layout.h"
+
+namespace {
+
+const int kButtonSpacing = 10;
+const int kButtonWidth = 60;
+const int kButtonHeight = 6;
+const int kButtonHeightPadding = 10;
+const int kButtonCornerRadius = 2;
+
+// 0.16 black
+const SkColor kHoverColor = SkColorSetARGB(0x2A, 0x00, 0x00, 0x00);
+
+// 0.2 black
+const SkColor kNormalColor = SkColorSetARGB(0x33, 0x00, 0x00, 0x00);
+
+// 0.33 black
+const SkColor kSelectedColor = SkColorSetARGB(0x55, 0x00, 0x00, 0x00);
+
+class PageSwitcherButton : public views::CustomButton {
+ public:
+  PageSwitcherButton(views::ButtonListener* listener)
+      : views::CustomButton(listener),
+        selected_(false) {
+  }
+  virtual ~PageSwitcherButton() {}
+
+  void SetSelected(bool selected) {
+    if (selected == selected_)
+      return;
+
+    selected_ = selected;
+    SchedulePaint();
+  }
+
+  // Overridden from views::View:
+  virtual gfx::Size GetPreferredSize() OVERRIDE {
+    return gfx::Size(kButtonWidth, kButtonHeight + kButtonHeightPadding);
+  }
+
+  virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE {
+    if (selected_ || state() == BS_PUSHED) {
+      PaintButton(canvas, kSelectedColor);
+    } else if (state() == BS_HOT) {
+      PaintButton(canvas, kHoverColor);
+    } else {
+      PaintButton(canvas, kNormalColor);
+    }
+  }
+
+ private:
+  // Paints a button that has two rounded corner at bottom.
+  void PaintButton(gfx::Canvas* canvas, SkColor color) {
+    gfx::Rect rect(GetContentsBounds());
+    rect.set_height(kButtonHeight);
+
+    gfx::Point center = rect.CenterPoint();
+
+    SkPath path;
+    path.incReserve(12);
+    path.moveTo(SkIntToScalar(rect.x()), SkIntToScalar(rect.y()));
+    path.arcTo(SkIntToScalar(rect.x()), SkIntToScalar(rect.bottom()),
+               SkIntToScalar(center.x()), SkIntToScalar(rect.bottom()),
+               SkIntToScalar(kButtonCornerRadius));
+    path.arcTo(SkIntToScalar(rect.right()), SkIntToScalar(rect.bottom()),
+               SkIntToScalar(rect.right()), SkIntToScalar(rect.y()),
+               SkIntToScalar(kButtonCornerRadius));
+    path.lineTo(SkIntToScalar(rect.right()), SkIntToScalar(rect.y()));
+    path.close();
+
+    SkPaint paint;
+    paint.setStyle(SkPaint::kFill_Style);
+    paint.setColor(color);
+    canvas->DrawPath(path, paint);
+  }
+
+  bool selected_;
+
+  DISALLOW_COPY_AND_ASSIGN(PageSwitcherButton);
+};
+
+// Gets PageSwitcherButton at |index| in |buttons|.
+PageSwitcherButton* GetButtonByIndex(views::View* buttons, int index) {
+  return static_cast<PageSwitcherButton*>(buttons->child_at(index));
+}
+
+}  // namespace
+
+namespace ash {
+
+PageSwitcher::PageSwitcher(PaginationModel* model)
+    : model_(model),
+      buttons_(NULL) {
+  buttons_ = new views::View;
+  buttons_->SetLayoutManager(new views::BoxLayout(
+      views::BoxLayout::kHorizontal, 0, 0, kButtonSpacing));
+  AddChildView(buttons_);
+
+  TotalPagesChanged();
+  SelectedPageChanged(-1, model->selected_page());
+  model_->AddObserver(this);
+}
+
+PageSwitcher::~PageSwitcher() {
+  model_->RemoveObserver(this);
+}
+
+gfx::Size PageSwitcher::GetPreferredSize() {
+  // Always return a size with correct height so that container resize is not
+  // needed when more pages are added.
+  return gfx::Size(kButtonWidth, kButtonHeight + kButtonHeightPadding);
+}
+
+void PageSwitcher::Layout() {
+  gfx::Rect rect(GetContentsBounds());
+  buttons_->SetBoundsRect(rect.Center(buttons_->GetPreferredSize()));
+}
+
+void PageSwitcher::ButtonPressed(views::Button* sender,
+                                 const views::Event& event) {
+  for (int i = 0; i < buttons_->child_count(); ++i) {
+    if (sender == static_cast<views::Button*>(buttons_->child_at(i))) {
+      model_->SelectPage(i);
+      break;
+    }
+  }
+}
+
+void PageSwitcher::TotalPagesChanged() {
+  buttons_->RemoveAllChildViews(true);
+  for (int i = 0; i < model_->total_pages(); ++i) {
+    PageSwitcherButton* button = new PageSwitcherButton(this);
+    button->SetSelected(i == model_->selected_page());
+    buttons_->AddChildView(button);
+  }
+  buttons_->SetVisible(model_->total_pages() > 1);
+  Layout();
+}
+
+void PageSwitcher::SelectedPageChanged(int old_selected, int new_selected) {
+  if (old_selected >= 0 && old_selected < buttons_->child_count())
+    GetButtonByIndex(buttons_, old_selected)->SetSelected(false);
+  if (new_selected >= 0 && new_selected < buttons_->child_count())
+    GetButtonByIndex(buttons_, new_selected)->SetSelected(true);
+}
+
+}  // namespace ash