Add new views::LabelButton and LabelButtonBorder.

ui/views/controls/button/label_button.cc

+// Copyright (c) 2012 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/views/controls/button/label_button.h"
+
+#include "base/logging.h"
+#include "grit/ui_resources.h"
+#include "ui/base/animation/throb_animation.h"
+#include "ui/base/resource/resource_bundle.h"
+#include "ui/views/controls/button/label_button_border.h"
+#include "ui/views/focus_border.h"
+
+#if defined(OS_WIN)
+#include "ui/gfx/color_utils.h"
+#include "ui/base/native_theme/native_theme_win.h"
+#endif
+
+namespace views {
+
+namespace {
+
+// The spacing between the icon and text.
+static const int kSpacing = 5;
+
+// The length of the hover fade animation.
+static const int kHoverAnimationDurationMs = 170;
+
+}  // namespace
+
+LabelButton::LabelButton(ButtonListener* listener, const string16& text)
+    : CustomButton(listener),
+      image_(new ImageView()),
+      label_(new Label(text)),
+      default_button_(false),
+      native_theme_(false) {
+  set_border(new LabelButtonBorder(this));
+  // Inset the button focus rect from the actual border; roughly match Windows.
+  set_focus_border(FocusBorder::CreateDashedFocusBorder(3, 3, 3, 3));
+  SetAnimationDuration(kHoverAnimationDurationMs);
+
+  AddChildView(image_);
+  image_->set_interactive(false);
+
+  AddChildView(label_);
+  label_->SetAutoColorReadabilityEnabled(false);
+  label_->SetHorizontalAlignment(Label::ALIGN_LEFT);
+  label_->SetElideBehavior(Label::ELIDE_AT_END);
+
+  // Initialize the colors, border, and layout for a Views-themed button.
+  SetNativeTheme(false);
+}
+
+LabelButton::~LabelButton() {}
+
+const gfx::ImageSkia& LabelButton::GetImage(ButtonState for_state) {
+  if (for_state != BS_NORMAL && button_state_images_[for_state].isNull())
+    return button_state_images_[BS_NORMAL];
+  return button_state_images_[for_state];
+}
+
+void LabelButton::SetImage(ButtonState for_state, const gfx::ImageSkia& image) {
+  button_state_images_[for_state] = image;
+  image_->SetImage(GetImage(state()));
+}
+
+const string16& LabelButton::GetText() const {
+  return label_->text();
+}
+
+void LabelButton::SetText(const string16& text) {
+  label_->SetText(text);
+}
+
+void LabelButton::SetTextColor(ButtonState for_state, SkColor color) {
+  button_state_colors_[for_state] = color;
+  if (for_state == BS_DISABLED)
+    label_->SetDisabledColor(color);
+  else if (for_state == state())
+    label_->SetEnabledColor(color);
+}
+
+bool LabelButton::GetTextMultiLine() const {
+  return label_->is_multi_line();
+}
+
+void LabelButton::SetTextMultiLine(bool text_multi_line) {
+  label_->SetMultiLine(text_multi_line);
+}
+
+Label::Alignment LabelButton::GetHorizontalAlignment() const {
+  return label_->horizontal_alignment();
+}
+
+void LabelButton::SetHorizontalAlignment(Label::Alignment alignment) {
+  label_->SetHorizontalAlignment(alignment);
+  InvalidateLayout();
+}
+
+void LabelButton::SetDefaultButton(bool default_button) {
+  if (default_button == default_button_)
+    return;
+  default_button_ = default_button;
+  ui::Accelerator accel(ui::VKEY_RETURN, ui::EF_NONE);
+  default_button_ ? AddAccelerator(accel) : RemoveAccelerator(accel);
+}
+
+void LabelButton::SetNativeTheme(bool native_theme) {
+  native_theme_ = native_theme;
+  static_cast<LabelButtonBorder*>(border())->set_native_theme(native_theme);
+
+  const ui::NativeTheme* theme = ui::NativeTheme::instance();
+  SkColor colors[BS_COUNT] = {
+    theme->GetSystemColor(ui::NativeTheme::kColorId_TextButtonEnabledColor),
+    theme->GetSystemColor(ui::NativeTheme::kColorId_TextButtonHoverColor),
+    theme->GetSystemColor(ui::NativeTheme::kColorId_TextButtonHoverColor),
+    theme->GetSystemColor(ui::NativeTheme::kColorId_TextButtonDisabledColor),
+  };
+#if defined(OS_WIN)
+  if (native_theme) {
+    colors[BS_NORMAL] = color_utils::GetSysSkColor(COLOR_BTNTEXT);
+    colors[BS_HOT] = color_utils::GetSysSkColor(COLOR_BTNTEXT);
+    colors[BS_PUSHED] = color_utils::GetSysSkColor(COLOR_BTNTEXT);
+    colors[BS_DISABLED] = color_utils::GetSysSkColor(COLOR_GRAYTEXT);
+  }
+#endif
+  for (size_t state = BS_NORMAL; state < BS_COUNT; ++state)
+    SetTextColor(static_cast<ButtonState>(state), colors[state]);
+
+  // Invalidate the layout to pickup the new insets from the border.
+  InvalidateLayout();
+}
+
+void LabelButton::StateChanged() {
+  const gfx::Size previous_image_size(image_->GetPreferredSize());
+  image_->SetImage(GetImage(state()));
+  const SkColor color = button_state_colors_[state()];
+  if (state() != BS_DISABLED && label_->enabled_color() != color)
+    label_->SetEnabledColor(color);
+  if (image_->GetPreferredSize() != previous_image_size)
+    Layout();
+}
+
+gfx::Size LabelButton::GetPreferredSize() {
+  gfx::Size size(label_->GetPreferredSize());
+  // TODO(msw): Multi-line labels are cut off at their preferred bounds.
+  //            This apparent bug in CanvasSkia requires investigation.
+  size.set_width(size.width() * (GetTextMultiLine() ? 2 : 1));
+  const gfx::Size image_size(image_->GetPreferredSize());
+  if (image_size.width() > 0 && size.width() > 0)
+    size.Enlarge(kSpacing, 0);
+  size.set_height(std::max(size.height(), image_size.height()));
+  size.Enlarge(image_size.width() + GetInsets().width(), GetInsets().height());
+
+  // Increase the minimum size monotonically with the preferred size.
+  size.SetSize(std::max(min_size_.width(), size.width()),
+               std::max(min_size_.height(), size.height()));
+  min_size_ = size;
+
+  // Return the largest known size clamped to the maximum size (if valid).
+  if (max_size_.width() > 0)
+    size.set_width(std::min(max_size_.width(), size.width()));
+  if (max_size_.height() > 0)
+    size.set_height(std::min(max_size_.height(), size.height()));
+  return size;
+}
+
+void LabelButton::Layout() {
+  gfx::Rect child_area(GetLocalBounds());
+  child_area.Inset(GetInsets());
+
+  gfx::Size image_size(image_->GetPreferredSize());
+  image_size.set_width(std::min(image_size.width(), child_area.width()));
+  image_size.set_height(std::min(image_size.height(), child_area.height()));
+
+  // The label takes any remaining width after sizing the image.
+  gfx::Size label_size(child_area.size());
+  if (!image_size.IsEmpty() && !label_size.IsEmpty()) {
+    label_size.set_width(child_area.width() - image_size.width() - kSpacing);
+    if (GetHorizontalAlignment() == Label::ALIGN_CENTER) {
+      gfx::Size preferred(label_->GetPreferredSize());
+      // TODO(msw): Multi-line labels are cut off at their preferred bounds.
+      //            This apparent bug in CanvasSkia requires investigation.
+      preferred.set_width(preferred.width() * (GetTextMultiLine() ? 2 : 1));
+      label_size.set_width(std::min(label_size.width(), preferred.width()));
+    }
+  }
+
+  gfx::Point image_origin(child_area.origin());
+  image_origin.Offset(0, (child_area.height() - image_size.height()) / 2);
+  if (GetHorizontalAlignment() == Label::ALIGN_CENTER) {
+    const int total_width = image_size.width() + label_size.width() +
+        ((image_size.width() > 0 && label_size.width() > 0) ? kSpacing : 0);
+    image_origin.Offset((child_area.width() - total_width) / 2, 0);
+  } else if (GetHorizontalAlignment() == Label::ALIGN_RIGHT) {
+    image_origin.Offset(child_area.width() - image_size.width(), 0);
+  }
+
+  gfx::Point label_origin(child_area.origin());
+  if (!image_size.IsEmpty() && GetHorizontalAlignment() != Label::ALIGN_RIGHT)
+    label_origin.set_x(image_origin.x() + image_size.width() + kSpacing);
+
+  image_->SetBoundsRect(gfx::Rect(image_origin, image_size));
+  label_->SetBoundsRect(gfx::Rect(label_origin, label_size));
+}
+
+std::string LabelButton::GetClassName() const {
+  return "views/LabelButton";
+}
+
+void LabelButton::ChildPreferredSizeChanged(View* child) {
+  PreferredSizeChanged();
+}
+
+ui::NativeTheme::Part LabelButton::GetThemePart() const {
+  return ui::NativeTheme::kPushButton;
+}
+
+gfx::Rect LabelButton::GetThemePaintRect() const {
+  return GetLocalBounds();
+}
+
+ui::NativeTheme::State LabelButton::GetThemeState(
+    ui::NativeTheme::ExtraParams* params) const {
+  GetExtraParams(params);
+  switch(state()) {
+    case BS_NORMAL:   return ui::NativeTheme::kNormal;
+    case BS_HOT:      return ui::NativeTheme::kHovered;
+    case BS_PUSHED:   return ui::NativeTheme::kPressed;
+    case BS_DISABLED: return ui::NativeTheme::kDisabled;
+    case BS_COUNT:    NOTREACHED() << "Unknown state: " << state();
+  }
+  return ui::NativeTheme::kNormal;
+}
+
+const ui::Animation* LabelButton::GetThemeAnimation() const {
+#if defined(OS_WIN) && !defined(USE_AURA)
+  if (!ui::NativeThemeWin::instance()->IsThemingActive())
+    return NULL;
+#endif
+  return hover_animation_.get();
+}
+
+ui::NativeTheme::State LabelButton::GetBackgroundThemeState(
+    ui::NativeTheme::ExtraParams* params) const {
+  GetExtraParams(params);
+  return ui::NativeTheme::kNormal;
+}
+
+ui::NativeTheme::State LabelButton::GetForegroundThemeState(
+    ui::NativeTheme::ExtraParams* params) const {
+  GetExtraParams(params);
+  return ui::NativeTheme::kHovered;
+}
+
+void LabelButton::GetExtraParams(ui::NativeTheme::ExtraParams* params) const {
+  params->button.checked = false;
+  params->button.indeterminate = false;
+  params->button.is_default = default_button();
+  params->button.is_focused = HasFocus() && IsAccessibilityFocusable();
+  params->button.has_border = native_theme();
+  params->button.classic_state = 0;
+  params->button.background_color = ui::NativeTheme::instance()->GetSystemColor(
+      ui::NativeTheme::kColorId_TextButtonBackgroundColor);
+}
+
+}  // namespace views