Volume bubble added for ChromeOS.

chrome/browser/chromeos/volume_bubble.cc

+// Copyright (c) 2010 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/volume_bubble.h"
+
+#include <gdk/gdk.h>
+
+#include "base/timer.h"
+#include "chrome/browser/chromeos/volume_bubble_view.h"
+#include "chrome/browser/views/info_bubble.h"
+#include "views/widget/root_view.h"
+
+namespace {
+const int kBubbleShowTimeoutSec = 2;
+const int kAnimationDurationMs = 200;
+const int kVolumeBubbleX = 300, kVolumeBubbleY = 700;
+}  // namespace
+
+namespace chromeos {
+
+// Temporary helper routine. Returns currently shown Chrome widget or NULL.
+// TODO(glotov): remove this in favor of enabling InfoBubble class act
+// without |parent| specified. crosbug.com/4025
+static views::Widget* GetToplevelWidget() {
+  views::Widget* widget = NULL;
+  GList *window_list = gtk_window_list_toplevels();
+  for (GList* iter = window_list; iter; iter = g_list_next(iter)) {
+    GtkWindow* const window = GTK_WINDOW(iter->data);
+    if (window && GTK_WIDGET(window)->window ==
+        gdk_screen_get_active_window(gdk_screen_get_default())) {
+      views::RootView* root = views::Widget::FindRootView(window);
+      if (root)
+        widget = root->GetWidget();
+      break;
+    }
+  }
+  g_list_free(window_list);
+  return widget;
+}
+
+VolumeBubble::VolumeBubble()
+    : previous_percent_(-1),
+      current_percent_(-1),
+      bubble_(NULL),
+      view_(NULL),
+      animation_(this) {
+  animation_.SetSlideDuration(kAnimationDurationMs);
+  animation_.SetTweenType(Tween::LINEAR);
+}
+
+void VolumeBubble::ShowVolumeBubble(int percent) {
+  if (percent < 0) percent = 0;

[sky, 2010/06/16 15:14:08]

Please, no single line ifs.

[glotov, 2010/06/16 16:30:38]

Done.

+  if (percent > 100) percent = 100;
+  if (previous_percent_ == -1) previous_percent_ = percent;
+  current_percent_ = percent;
+  if (!bubble_) {
+    views::Widget* widget = GetToplevelWidget();
+    if (widget == NULL)
+      return;
+    DCHECK(view_ == NULL);
+    view_ = new VolumeBubbleView;
+    view_->Init(previous_percent_);
+    // TODO(glotov): Place volume bubble over the keys initiated the
+    // volume change. This metric must be specific to the given
+    // architecture. crosbug.com/4028
+    bubble_ = InfoBubble::Show(widget,
+                               gfx::Rect(kVolumeBubbleX, kVolumeBubbleY, 0, 0),
+                               BubbleBorder::FLOAT, view_, this);
+  } else {
+    DCHECK(view_);
+    timeout_timer_.Stop();
+  }
+  if (animation_.is_animating()) animation_.End();
+  animation_.Reset();
+  animation_.Show();
+  timeout_timer_.Start(base::TimeDelta::FromSeconds(kBubbleShowTimeoutSec),
+                       this, &VolumeBubble::OnTimeout);
+}
+
+void VolumeBubble::OnTimeout() {
+  if (bubble_)
+    bubble_->Close();
+}
+
+void VolumeBubble::InfoBubbleClosing(InfoBubble* info_bubble, bool) {
+  DCHECK(info_bubble == bubble_);
+  timeout_timer_.Stop();
+  animation_.Stop();
+  bubble_ = NULL;
+  view_ = NULL;
+}
+
+void VolumeBubble::AnimationEnded(const Animation* animation) {
+  previous_percent_ = current_percent_;
+}
+
+void VolumeBubble::AnimationProgressed(const Animation* animation) {
+  if (view_) {
+    view_->Update(
+        Tween::ValueBetween(animation->GetCurrentValue(),
+                            previous_percent_,
+                            current_percent_));
+  }
+}
+
+}  // namespace chromeos