Cleanup CandidateWindowView.

chrome/browser/chromeos/input_method/candidate_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/candidate_view.h"
+
+#include "base/strings/utf_string_conversions.h"
+#include "chrome/browser/chromeos/input_method/candidate_window_constants.h"
+#include "chromeos/ime/candidate_window.h"
+#include "ui/gfx/color_utils.h"
+#include "ui/native_theme/native_theme.h"
+#include "ui/views/background.h"
+#include "ui/views/border.h"
+#include "ui/views/controls/label.h"
+#include "ui/views/widget/widget.h"
+
+namespace chromeos {
+namespace input_method {
+
+namespace {
+
+// VerticalCandidateLabel is used for rendering candidate text in
+// the vertical candidate window.
+class VerticalCandidateLabel : public views::Label {
+ public:
+  VerticalCandidateLabel() {}
+
+ private:
+  virtual ~VerticalCandidateLabel() {}
+
+  // Returns the preferred size, but guarantees that the width has at
+  // least kMinCandidateLabelWidth pixels.
+  virtual gfx::Size GetPreferredSize() OVERRIDE {
+    gfx::Size size = Label::GetPreferredSize();
+    size.SetToMax(gfx::Size(kMinCandidateLabelWidth, 0));
+    size.SetToMin(gfx::Size(kMaxCandidateLabelWidth, size.height()));
+    return size;
+  }
+
+  DISALLOW_COPY_AND_ASSIGN(VerticalCandidateLabel);
+};
+
+// Creates the shortcut label, and returns it (never returns NULL).
+// The label text is not set in this function.
+views::Label* CreateShortcutLabel(
+    CandidateWindow::Orientation orientation,
+    const ui::NativeTheme& theme) {
+  // Create the shortcut label. The label will be owned by
+  // |wrapped_shortcut_label|, hence it's deleted when
+  // |wrapped_shortcut_label| is deleted.
+  views::Label* shortcut_label = new views::Label;
+
+  if (orientation == CandidateWindow::VERTICAL) {
+    shortcut_label->SetFont(
+        shortcut_label->font().DeriveFont(kFontSizeDelta, gfx::Font::BOLD));
+  } else {
+    shortcut_label->SetFont(
+        shortcut_label->font().DeriveFont(kFontSizeDelta));
+  }
+  // TODO(satorux): Maybe we need to use language specific fonts for
+  // candidate_label, like Chinese font for Chinese input method?
+  shortcut_label->SetEnabledColor(theme.GetSystemColor(
+      ui::NativeTheme::kColorId_LabelEnabledColor));
+  shortcut_label->SetDisabledColor(theme.GetSystemColor(
+      ui::NativeTheme::kColorId_LabelDisabledColor));
+
+  // Setup paddings.
+  const gfx::Insets kVerticalShortcutLabelInsets(1, 6, 1, 6);
+  const gfx::Insets kHorizontalShortcutLabelInsets(1, 3, 1, 0);
+  const gfx::Insets insets =
+      (orientation == CandidateWindow::VERTICAL ?
+       kVerticalShortcutLabelInsets :
+       kHorizontalShortcutLabelInsets);
+  shortcut_label->set_border(views::Border::CreateEmptyBorder(
+      insets.top(), insets.left(), insets.bottom(), insets.right()));
+
+  // Add decoration based on the orientation.
+  if (orientation == CandidateWindow::VERTICAL) {
+    // Set the background color.
+    SkColor blackish = color_utils::AlphaBlend(
+        SK_ColorBLACK,
+        theme.GetSystemColor(ui::NativeTheme::kColorId_WindowBackground),
+        0x40);
+    SkColor transparent_blakish = color_utils::AlphaBlend(
+        SK_ColorTRANSPARENT, blackish, 0xE0);
+    shortcut_label->set_background(
+        views::Background::CreateSolidBackground(transparent_blakish));
+  }
+
+  return shortcut_label;
+}
+
+// Creates the candidate label, and returns it (never returns NULL).
+// The label text is not set in this function.
+views::Label* CreateCandidateLabel(
+    CandidateWindow::Orientation orientation) {
+  views::Label* candidate_label = NULL;
+
+  // Create the candidate label. The label will be added to |this| as a
+  // child view, hence it's deleted when |this| is deleted.
+  if (orientation == CandidateWindow::VERTICAL) {
+    candidate_label = new VerticalCandidateLabel;
+  } else {
+    candidate_label = new views::Label;
+  }
+
+  // Change the font size.
+  candidate_label->SetFont(
+      candidate_label->font().DeriveFont(kFontSizeDelta));
+  candidate_label->SetHorizontalAlignment(gfx::ALIGN_LEFT);
+
+  return candidate_label;
+}
+
+// Creates the annotation label, and return it (never returns NULL).
+// The label text is not set in this function.
+views::Label* CreateAnnotationLabel(
+    CandidateWindow::Orientation orientation, const ui::NativeTheme& theme) {
+  // Create the annotation label.
+  views::Label* annotation_label = new views::Label;
+
+  // Change the font size and color.
+  annotation_label->SetFont(
+      annotation_label->font().DeriveFont(kFontSizeDelta));
+  annotation_label->SetEnabledColor(theme.GetSystemColor(
+      ui::NativeTheme::kColorId_LabelDisabledColor));
+  annotation_label->SetHorizontalAlignment(gfx::ALIGN_LEFT);
+
+  return annotation_label;
+}
+
+}  // namespace
+
+CandidateView::CandidateView(
+    views::ButtonListener* listener,
+    CandidateWindow::Orientation orientation)
+    : views::CustomButton(listener),
+      orientation_(orientation),
+      shortcut_label_(NULL),
+      candidate_label_(NULL),
+      annotation_label_(NULL),
+      infolist_icon_(NULL) {
+  set_border(views::Border::CreateEmptyBorder(1, 1, 1, 1));
+
+  const ui::NativeTheme& theme = *GetNativeTheme();
+  shortcut_label_ = CreateShortcutLabel(orientation, theme);
+  candidate_label_ = CreateCandidateLabel(orientation);
+  annotation_label_ = CreateAnnotationLabel(orientation, theme);
+
+  AddChildView(shortcut_label_);
+  AddChildView(candidate_label_);
+  AddChildView(annotation_label_);
+
+  if (orientation == CandidateWindow::VERTICAL) {
+    infolist_icon_ = new views::View;
+    infolist_icon_->set_background(
+        views::Background::CreateSolidBackground(theme.GetSystemColor(
+            ui::NativeTheme::kColorId_FocusedBorderColor)));
+    AddChildView(infolist_icon_);
+  }
+}
+
+void CandidateView::GetPreferredWidths(int* shortcut_width,
+                                       int* candidate_width) {
+  *shortcut_width = shortcut_label_->GetPreferredSize().width();
+  *candidate_width = candidate_label_->GetPreferredSize().width();
+}
+
+void CandidateView::SetWidths(int shortcut_width, int candidate_width) {
+  shortcut_width_ = shortcut_width;
+  shortcut_label_->SetVisible(shortcut_width_ != 0);
+  candidate_width_ = candidate_width;
+}
+
+void CandidateView::SetEntry(const CandidateWindow::Entry& entry) {
+  std::string label = entry.label;
+  if (!label.empty() && orientation_ != CandidateWindow::VERTICAL)
+    label += '.';
+  shortcut_label_->SetText(base::UTF8ToUTF16(label));
+  candidate_label_->SetText(base::UTF8ToUTF16(entry.value));
+  annotation_label_->SetText(base::UTF8ToUTF16(entry.annotation));
+}
+
+void CandidateView::SetInfolistIcon(bool enable) {
+  if (infolist_icon_)
+    infolist_icon_->SetVisible(enable);
+  SchedulePaint();
+}
+
+void CandidateView::StateChanged() {
+  shortcut_label_->SetEnabled(state() != STATE_DISABLED);
+  if (state() == STATE_PRESSED) {
+    ui::NativeTheme* theme = GetNativeTheme();
+    set_background(
+        views::Background::CreateSolidBackground(theme->GetSystemColor(
+            ui::NativeTheme::kColorId_TextfieldSelectionBackgroundFocused)));
+    set_border(views::Border::CreateSolidBorder(
+        1, theme->GetSystemColor(
+            ui::NativeTheme::kColorId_FocusedBorderColor)));
+
+    // Cancel currently focused one.
+    for (int i = 0; i < parent()->child_count(); ++i) {
+      CandidateView* view =
+          static_cast<CandidateView*>((parent()->child_at(i)));
+      if (view != this && view->state() == STATE_PRESSED)
+        view->SetState(STATE_NORMAL);
+    }
+  } else {
+    set_background(NULL);
+    set_border(views::Border::CreateEmptyBorder(1, 1, 1, 1));
+  }
+}
+
+bool CandidateView::OnMouseDragged(const ui::MouseEvent& event) {
+  if (!HitTestPoint(event.location())) {
+    // Moves the drag target to the sibling view.
+    gfx::Point location_in_widget(event.location());
+    ConvertPointToWidget(this, &location_in_widget);
+    for (int i = 0; i < parent()->child_count(); ++i) {
+      views::View* sibling = parent()->child_at(i);
+      if (sibling == this)
+        continue;
+      gfx::Point location_in_sibling(location_in_widget);
+      ConvertPointFromWidget(sibling, &location_in_sibling);
+      if (sibling->HitTestPoint(location_in_sibling)) {
+        GetWidget()->GetRootView()->SetMouseHandler(sibling);
+        return sibling->OnMouseDragged(event);
+      }
+    }
+
+    return false;
+  }
+
+  return views::CustomButton::OnMouseDragged(event);
+}
+
+void CandidateView::Layout() {
+  const int padding_width =
+      orientation_ == CandidateWindow::VERTICAL ? 4 : 6;
+  int x = 0;
+  shortcut_label_->SetBounds(x, 0, shortcut_width_, height());
+  if (shortcut_width_ > 0)
+    x += shortcut_width_ + padding_width;
+  candidate_label_->SetBounds(x, 0, candidate_width_, height());
+  x += candidate_width_ + padding_width;
+
+  int right = bounds().right();
+  if (infolist_icon_ && infolist_icon_->visible()) {
+    infolist_icon_->SetBounds(
+        right - kInfolistIndicatorIconWidth - kInfolistIndicatorIconPadding,
+        kInfolistIndicatorIconPadding,
+        kInfolistIndicatorIconWidth,
+        height() - kInfolistIndicatorIconPadding * 2);
+    right -= kInfolistIndicatorIconWidth + kInfolistIndicatorIconPadding * 2;
+  }
+  annotation_label_->SetBounds(x, 0, right - x, height());
+}
+
+gfx::Size CandidateView::GetPreferredSize() {
+  const int padding_width =
+      orientation_ == CandidateWindow::VERTICAL ? 4 : 6;
+  gfx::Size size;
+  if (shortcut_label_->visible()) {
+    size = shortcut_label_->GetPreferredSize();
+    size.Enlarge(padding_width, 0);
+  }
+  gfx::Size candidate_size = candidate_label_->GetPreferredSize();
+  size.Enlarge(candidate_size.width() + padding_width, 0);
+  size.SetToMax(candidate_size);
+  if (annotation_label_->visible()) {
+    gfx::Size annotation_size = annotation_label_->GetPreferredSize();
+    size.Enlarge(annotation_size.width() + padding_width, 0);
+    size.SetToMax(annotation_size);
+  }
+
+  // Reserves the margin for infolist_icon even if it's not visible.
+  size.Enlarge(
+      kInfolistIndicatorIconWidth + kInfolistIndicatorIconPadding * 2, 0);
+  return size;
+}
+
+}  // namespace input_method
+}  // namespace chromeos