Introduces the speech recognition UI to app_list.

ui/app_list/views/speech_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 "ui/app_list/views/speech_view.h"
+
+#include "base/strings/utf_string_conversions.h"
+#include "grit/ui_resources.h"
+#include "grit/ui_strings.h"
+#include "ui/app_list/app_list_model.h"
+#include "ui/app_list/app_list_view_delegate.h"
+#include "ui/base/l10n/l10n_util.h"
+#include "ui/base/resource/resource_bundle.h"
+#include "ui/gfx/canvas.h"
+#include "ui/views/animation/bounds_animator.h"
+#include "ui/views/background.h"
+#include "ui/views/controls/button/image_button.h"
+#include "ui/views/controls/label.h"
+#include "ui/views/layout/fill_layout.h"
+#include "ui/views/shadow_border.h"
+
+namespace app_list {
+
+namespace {
+
+const int kShadowOffset = 1;
+const int kShadowBlur = 4;
+const int kTextSize = 20;
+const int kMicButtonMargin = 12;
+const int kTextMargin = 32;
+const int kIndicatorRadiusMax = 100;
+const int kIndicatorAnimationDuration = 100;
+const SkColor kShadowColor = SkColorSetARGB(0.3 * 255, 0, 0, 0);
+const SkColor kHintTextColor = SkColorSetRGB(119, 119, 119);
+const SkColor kResultTextColor = SkColorSetRGB(178, 178, 178);
+const SkColor kSoundLevelIndicatorColor = SkColorSetRGB(219, 219, 219);
+
+// TODO(mukai): check with multiple devices to make sure these limits.
+const int16 kSoundLevelMin = 50;
+const int16 kSoundLevelMax = 210;
+
+class SoundLevelIndicator : public views::View {
+ public:
+  SoundLevelIndicator();
+  virtual ~SoundLevelIndicator();
+
+ private:
+  // Overridden from views::View:
+  virtual void Paint(gfx::Canvas* canvas) OVERRIDE;
+
+  DISALLOW_COPY_AND_ASSIGN(SoundLevelIndicator);
+};
+
+SoundLevelIndicator::SoundLevelIndicator() {}
+
+SoundLevelIndicator::~SoundLevelIndicator() {}
+
+void SoundLevelIndicator::Paint(gfx::Canvas* canvas) {
+  SkPaint paint;
+  paint.setStyle(SkPaint::kFill_Style);
+  paint.setColor(kSoundLevelIndicatorColor);
+  canvas->DrawCircle(bounds().CenterPoint(), width() / 2, paint);
+}
+
+// MicButton is an image button with circular hit area.
+class MicButton : public views::ImageButton {
+ public:
+  MicButton(views::ButtonListener* listener);
+  virtual ~MicButton();
+
+ private:
+  // Overridden from views::View:
+  virtual bool HitTestRect(const gfx::Rect& rect) const OVERRIDE;
+
+  DISALLOW_COPY_AND_ASSIGN(MicButton);
+};
+
+MicButton::MicButton(views::ButtonListener* listener)
+    : views::ImageButton(listener) {}
+
+MicButton::~MicButton() {}
+
+bool MicButton::HitTestRect(const gfx::Rect& rect) const {
+  if (!views::ImageButton::HitTestRect(rect))
+    return false;
+
+  gfx::Rect local_bounds = GetLocalBounds();
+  int radius = local_bounds.width() / 2;
+  return (rect.origin() - local_bounds.CenterPoint()).LengthSquared() <
+      radius * radius;
+}
+
+}  // namespace
+
+// static
+const int SpeechView::kMaxHeight = 300;
+
+SpeechView::SpeechView(AppListViewDelegate* delegate)
+    : delegate_(delegate) {
+  set_border(new views::ShadowBorder(
+      kShadowBlur,
+      kShadowColor,
+      kShadowOffset,  // Vertical offset.
+      0));
+
+  // To keep the painting order of the border and the background, this class
+  // actually has a single child of 'container' which has white background and
+  // contains all components.
+  views::View* container = new views::View();
+  container->set_background(
+      views::Background::CreateSolidBackground(SK_ColorWHITE));
+
+  // TODO: add Google logo.
+  indicator_ = new SoundLevelIndicator();
+  indicator_->SetVisible(false);
+  container->AddChildView(indicator_);
+
+  mic_button_ = new MicButton(this);
+  container->AddChildView(mic_button_);
+
+  // TODO: use BoundedLabel to cap 2 lines.
+  speech_result_ = new views::Label();
+  speech_result_->SetHorizontalAlignment(gfx::ALIGN_LEFT);
+  const gfx::FontList& font_list = speech_result_->font_list();
+  speech_result_->SetFontList(font_list.DeriveFontListWithSize(kTextSize));
+  speech_result_->SetMultiLine(true);
+  container->AddChildView(speech_result_);
+
+  AddChildView(container);
+
+  delegate_->GetModel()->speech_ui()->AddObserver(this);
+  indicator_animator_.reset(new views::BoundsAnimator(container));
+  indicator_animator_->SetAnimationDuration(kIndicatorAnimationDuration);
+  indicator_animator_->set_tween_type(gfx::Tween::LINEAR);
+
+  Reset();
+}
+
+SpeechView::~SpeechView() {
+  delegate_->GetModel()->speech_ui()->RemoveObserver(this);
+}
+
+void SpeechView::Reset() {
+  ui::ResourceBundle& bundle = ui::ResourceBundle::GetSharedInstance();
+  speech_result_->SetText(l10n_util::GetStringUTF16(
+      IDS_APP_LIST_SPEECH_HINT_TEXT));
+  speech_result_->SetEnabledColor(kHintTextColor);
+  mic_button_->SetImage(views::Button::STATE_NORMAL, bundle.GetImageSkiaNamed(
+      IDR_APP_LIST_SPEECH_MIC_ON));
+}
+
+int SpeechView::GetIndicatorRadius(int16 level) {
+  level = std::min(std::max(level, kSoundLevelMin), kSoundLevelMax);
+  int radius_min = mic_button_->width() / 2;
+  return (level - kSoundLevelMin) * (kIndicatorRadiusMax - radius_min) /
+      (kSoundLevelMax - kSoundLevelMin) + radius_min;
+}
+
+void SpeechView::Layout() {
+  views::View* container = child_at(0);
+  container->SetBoundsRect(GetContentsBounds());
+
+  // Because container is a pure View, this class should layout its children.
+  // TODO: arrange Google logo.
+  const gfx::Rect contents_bounds = container->GetContentsBounds();
+  gfx::Size mic_size = mic_button_->GetPreferredSize();
+  gfx::Point mic_origin(
+      contents_bounds.right() - kMicButtonMargin - mic_size.width(),
+      contents_bounds.y() + kMicButtonMargin);
+  mic_button_->SetBoundsRect(gfx::Rect(mic_origin, mic_size));
+
+  int speech_width = contents_bounds.width() - kTextMargin * 2;
+  speech_result_->SizeToFit(speech_width);
+  int speech_height = speech_result_->GetHeightForWidth(speech_width);
+  speech_result_->SetBounds(
+      contents_bounds.x() + kTextMargin,
+      contents_bounds.bottom() - kTextMargin - speech_height,
+      speech_width,
+      speech_height);
+}
+
+void SpeechView::ButtonPressed(views::Button* sender, const ui::Event& event) {
+  delegate_->ToggleSpeechRecognition();
+}
+
+void SpeechView::OnSpeechSoundLevelChanged(int16 level) {
+  if (!visible())
+    return;
+
+  gfx::Point origin = mic_button_->bounds().CenterPoint();
+  int radius = GetIndicatorRadius(level);
+  origin.Offset(-radius, -radius);
+  gfx::Rect indicator_bounds =
+      gfx::Rect(origin, gfx::Size(radius * 2, radius * 2));
+  if (indicator_->visible()) {
+    indicator_animator_->AnimateViewTo(indicator_, indicator_bounds);
+  } else {
+    indicator_->SetVisible(true);
+    indicator_->SetBoundsRect(indicator_bounds);
+  }
+}
+
+void SpeechView::OnSpeechResult(const base::string16& result,
+                                bool is_final) {
+  speech_result_->SetText(result);
+  speech_result_->SetEnabledColor(kResultTextColor);
+}
+
+void SpeechView::OnSpeechRecognitionStateChanged(
+    SpeechRecognitionState new_state) {
+  int resource_id = IDR_APP_LIST_SPEECH_MIC_OFF;
+  if (new_state == SPEECH_RECOGNITION_ON)
+    resource_id = IDR_APP_LIST_SPEECH_MIC_ON;
+  else if (new_state == SPEECH_RECOGNITION_IN_SPEECH)
+    resource_id = IDR_APP_LIST_SPEECH_MIC_RECORDING;
+
+  ui::ResourceBundle& bundle = ui::ResourceBundle::GetSharedInstance();
+  mic_button_->SetImage(views::Button::STATE_NORMAL, bundle.GetImageSkiaNamed(
+      resource_id));
+}
+
+}  // namespace app_list