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;
+
+// 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
+
+// Class overriding views::Label::GetPreferredSize().
+class ModeIndicatorLabel : public views::Label {
+ public:
+  explicit ModeIndicatorLabel(const string16& label)
+      : views::Label(label) {}
+
+  virtual ~ModeIndicatorLabel() {}
+
+  virtual gfx::Size GetPreferredSize() OVERRIDE {

[Jun Mukai, 2013/12/02 21:08:41]

You don't have to inherit Label. Actually you can declare
ModeIndicatorDelegateView::GetPreferredSize to do this.

[Hiro Komatsu, 2013/12/03 02:39:36]

Done.

+    gfx::Size size = views::Label::GetPreferredSize();
+    size.SetToMax(gfx::Size(kMinSize, kMinSize));
+    return size;
+  }
+};
+
+
+ModeIndicatorDelegateView::ModeIndicatorDelegateView(
+    const gfx::Rect& cursor_bounds,
+    const string16& label)
+  : cursor_bounds_(cursor_bounds),
+    label_(label) {
+  set_use_focusless(true);
+  set_accept_events(false);
+  set_shadow(views::BubbleBorder::NO_SHADOW);

[Jun Mukai, 2013/12/02 21:08:41]

should specify parent_window?
Otherwise it will be in the default container (BubbleContainer?) which might
cause unexpected behaviors.

[Hiro Komatsu, 2013/12/03 02:39:36]

Done.

+
+  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);

[Jun Mukai, 2013/12/02 21:08:41]

you don't have to do that. Bubble can take care of this (IIRC)

[Hiro Komatsu, 2013/12/03 02:39:36]

It seems a bug of BubbleFrameView.  Till the bug is fixed, this work around is
necessary.

https://code.google.com/p/chromium/issues/detail?id=325009

Added a comment.

+}
+
+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);
+}
+
+void ModeIndicatorDelegateView::Init() {
+  SetLayoutManager(new views::FillLayout());
+  ModeIndicatorLabel* label_view = new ModeIndicatorLabel(label_);
+  AddChildView(label_view);
+
+  SetAnchorRect(cursor_bounds_);
+}
+
+}  // namespace input_method
+}  // namespace chromeos