Mode Indicator using BubbleDelegateView.

chrome/browser/chromeos/input_method/mode_indicator_delegate_view.cc

+// Copyright 2013 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/chromeos/input_method/mode_indicator_delegate_view.h"
+
+#include "ash/shell.h"
+#include "ash/wm/window_animations.h"
+#include "base/logging.h"
+#include "ui/views/bubble/bubble_delegate.h"
+#include "ui/views/controls/label.h"
+#include "ui/views/layout/fill_layout.h"
+
+namespace chromeos {
+namespace input_method {
+
+namespace {
+// Minimum size of inner contents in pixel.
+const int kMinSize = 43;

[Jun Mukai, 2013/12/03 01:09:28]

Noticed that the bubble is slightly bigger than the past. Possibly this size is
too big, because bubble itself has margins (to draw the round corner).  Probably
this should be 31, 43 - kDefaultMargin (=6) * 2.
Or you should use margin().width() (and height()) in GetPreferredSize()

+
+// If the cursor bounds is lower than this margin in pixel, the mode
+// indicator is shown above the cursor instead on bottom.
+const int kSizeMargin = 75;
+
+// After this duration in msec, the mode inicator will be fading out.
+const int kShowingDuration = 500;
+}  // namespace
+
+
+ModeIndicatorDelegateView::ModeIndicatorDelegateView(
+    const gfx::Rect& cursor_bounds,
+    const string16& label)
+  : cursor_bounds_(cursor_bounds),
+    label_view_(new views::Label(label)) {
+  set_use_focusless(true);
+  set_accept_events(false);
+  set_shadow(views::BubbleBorder::NO_SHADOW);
+
+  const gfx::Rect screen_bounds =
+      ash::Shell::GetScreen()->GetDisplayMatching(cursor_bounds).work_area();
+  if (screen_bounds.bottom() - cursor_bounds.bottom() > kSizeMargin)
+    set_arrow(views::BubbleBorder::TOP_CENTER);
+  else
+    set_arrow(views::BubbleBorder::BOTTOM_CENTER);
+}
+
+ModeIndicatorDelegateView::~ModeIndicatorDelegateView() {}
+
+void ModeIndicatorDelegateView::FadeOut() {
+  StartFade(false);
+}
+
+void ModeIndicatorDelegateView::ShowAndFadeOut() {
+  views::corewm::SetWindowVisibilityAnimationTransition(
+      GetWidget()->GetNativeView(),
+      views::corewm::ANIMATE_HIDE);
+  GetWidget()->Show();
+  timer_.Start(FROM_HERE,
+               base::TimeDelta::FromMilliseconds(kShowingDuration),
+               this,
+               &ModeIndicatorDelegateView::FadeOut);
+}
+
+gfx::Size ModeIndicatorDelegateView::GetPreferredSize() {
+  gfx::Size size = label_view_->GetPreferredSize();
+  size.SetToMax(gfx::Size(kMinSize, kMinSize));
+  return size;
+}
+
+void ModeIndicatorDelegateView::Init() {
+  SetLayoutManager(new views::FillLayout());
+  AddChildView(label_view_);
+
+  SetAnchorRect(cursor_bounds_);
+}
+
+}  // namespace input_method
+}  // namespace chromeos