athena: Add a minimized state for the home-card.

athena/home/minimized_home.cc

+// Copyright 2014 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 "athena/home/minimized_home.h"
+
+#include "ui/views/background.h"
+#include "ui/views/layout/box_layout.h"
+#include "ui/views/view.h"
+#include "ui/views/widget/widget.h"
+
+namespace {
+
+const SkColor kDragHandleColorNormal = SK_ColorGRAY;
+const SkColor kDragHandleColorHot = SK_ColorWHITE;
+
+class MinimizedHomeView : public views::View {
+ public:
+  explicit MinimizedHomeView(athena::MinimizedHomeDragDelegate* delegate)
+      : delegate_(delegate),
+        color_(SK_ColorTRANSPARENT) {
+    SetColor(kDragHandleColorNormal);
+  }
+  virtual ~MinimizedHomeView() {}
+
+ private:
+  void SetColor(SkColor color) {
+    if (color_ == color)
+      return;
+    color_ = color;
+    set_background(views::Background::CreateSolidBackground(color_));
+    SchedulePaint();
+  }
+
+  // views::View:
+  virtual gfx::Size GetPreferredSize() const OVERRIDE {
+    const int kDragHandleWidth = 80;
+    const int kDragHandleHeight = 4;
+    return gfx::Size(kDragHandleWidth, kDragHandleHeight);
+  }
+
+  virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE {
+    SkColor change_color = SK_ColorTRANSPARENT;
+    if (event->type() == ui::ET_GESTURE_BEGIN &&
+        event->details().touch_points() == 1) {
+      change_color = kDragHandleColorHot;
+    } else if (event->type() == ui::ET_GESTURE_END &&
+               event->details().touch_points() == 1) {
+      change_color = kDragHandleColorNormal;
+    }
+
+    if (change_color != SK_ColorTRANSPARENT) {
+      SetColor(change_color);
+      event->SetHandled();
+      return;
+    }
+
+    if (event->type() == ui::ET_GESTURE_SCROLL_BEGIN) {
+      event->SetHandled();
+    } else if (event->type() == ui::ET_SCROLL_FLING_START) {
+      const ui::GestureEventDetails& details = event->details();
+      const float kFlingCompletionVelocity = -100.f;
+      if (details.velocity_y() < kFlingCompletionVelocity)
+        delegate_->OnDragUpCompleted();
+      SetColor(kDragHandleColorNormal);
+    }
+  }
+
+  athena::MinimizedHomeDragDelegate* delegate_;
+  SkColor color_;
+
+  DISALLOW_COPY_AND_ASSIGN(MinimizedHomeView);
+};
+
+}  // namespace
+
+namespace athena {
+
+views::Widget* CreateMinimizedHome(aura::Window* container,
+                                   MinimizedHomeDragDelegate* delegate) {
+  views::Widget* widget = new views::Widget;
+  views::Widget::InitParams params(
+      views::Widget::InitParams::TYPE_WINDOW_FRAMELESS);
+  params.parent = container;
+  params.delegate = NULL;
+  widget->Init(params);
+
+  views::View* content_view = new views::View;
+  widget->SetContentsView(content_view);
+  views::BoxLayout* layout =
+      new views::BoxLayout(views::BoxLayout::kHorizontal, 0, 2, 0);
+  layout->set_main_axis_alignment(views::BoxLayout::MAIN_AXIS_ALIGNMENT_CENTER);
+  content_view->SetLayoutManager(layout);
+
+  views::View* view = new MinimizedHomeView(delegate);
+  content_view->AddChildView(view);
+  return widget;
+}
+
+}  // namespace athena