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/shell_window_ids.h"
+#include "ash/wm/window_animations.h"
+#include "ash/wm/window_util.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.
+// 43 is the designed size including the default margin (6 * 2).
+const int kMinSize = 31;
+
+// 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_parent_window(
+      ash::Shell::GetContainer(
+          ash::wm::GetActiveWindow()->GetRootWindow(),
+          ash::internal::kShellWindowId_InputMethodContainer));
+  set_shadow(views::BubbleBorder::NO_SHADOW);
+
+  // This is a workaround for an issue of BubbleFrameView
+  // http://crbug.com/325009
+  // Without this workaround, the bounds of the inner contents is shifted
+  // lower than the expectation on offscreen handling (e.g. showing the
+  // bubble upper then the anchor).
+  //
+  // TODO(komatsu): Delete this workaround when the above issue is fixed.
+  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