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/gfx/canvas.h"
+#include "ui/gfx/image/image.h"
+#include "ui/views/controls/button/button_border.h"
+#include "ui/views/controls/button/button.h"
+#include "ui/views/focus_border.h"
+#include "ui/views/layout/grid_layout.h"
+#include "ui/views/widget/widget.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 ButtonBorder(this));
+  // Inset the button focus rect from the actual border; match Windows roughly.
+  set_focus_border(FocusBorder::CreateDashedFocusBorder(3, 3, 3, 3));
+  SetAnimationDuration(kHoverAnimationDurationMs);
+
+  image_->set_owned_by_client();
+  image_->set_interactive(false);
+
+  label_->set_owned_by_client();
+  label_->SetAutoColorReadabilityEnabled(false);
+  label_->SetHorizontalAlignment(Label::ALIGN_LEFT);
+  label_->SetElideBehavior(Label::ELIDE_AT_END);
+
+  // Initialize the colors 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) {
+  const bool was_empty = GetImage(state()).isNull();
+  button_state_images_[for_state] = image;
+  if (was_empty != GetImage(state()).isNull())
+    UpdateLayout();
+}
+
+Label* LabelButton::GetLabel() const {
+  return label_.get();
+}
+
+void LabelButton::SetText(const string16& text) {
+  const bool was_empty = GetLabel()->text().empty();
+  GetLabel()->SetText(text);
+  if (was_empty != GetLabel()->text().empty())
+    UpdateLayout();
+}
+
+void LabelButton::SetTextColor(ButtonState for_state, SkColor color) {
+  button_state_colors_[for_state] = color;
+  if (for_state == BS_DISABLED)
+    GetLabel()->SetDisabledColor(color);
+  else if (for_state == state())
+    GetLabel()->SetEnabledColor(color);
+}
+
+Label::Alignment LabelButton::GetHorizontalAlignment() const {
+  return GetLabel()->horizontal_alignment();
+}
+
+void LabelButton::SetHorizontalAlignment(Label::Alignment alignment) {
+  GetLabel()->SetHorizontalAlignment(alignment);
+  UpdateLayout();
+}
+
+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<ButtonBorder*>(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]);
+
+  UpdateLayout();
+}
+
+void LabelButton::StateChanged() {
+  const bool was_empty = image_->GetImage().isNull();
+  image_->SetImage(GetImage(state()));
+  if (was_empty != image_->GetImage().isNull())
+    UpdateLayout();
+  const SkColor color = button_state_colors_[state()];
+  if (state() != BS_DISABLED && GetLabel()->enabled_color() != color)
+    GetLabel()->SetEnabledColor(color);
+}
+
+gfx::Size LabelButton::GetPreferredSize() {
+  gfx::Size size = label_->GetPreferredSize();
+  size.set_height(std::max(size.height(), GetImage(state()).height()));
+  size.Enlarge(GetInsets().width() + GetImage(state()).width() + kSpacing,
+               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;
+}
+
+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);
+}
+
+void LabelButton::UpdateLayout() {
+  // Temporarily disregard state changes while updating layout.
+  const ButtonState saved_state = state();
+  SetState(BS_DISABLED);
+
+  RemoveAllChildViews(false);
+  GridLayout* layout = GridLayout::CreatePanel(this);
+  ColumnSet* columns = layout->AddColumnSet(0);
+  layout->SetInsets(GetInsets());
+  SetLayoutManager(layout);
+
+  const bool image = !image_->GetImage().isNull();
+  // Layout with the label unless it is empty and the alignment is centered.
+  const bool label = !GetLabel()->text().empty() ||
+                     (GetHorizontalAlignment() != Label::ALIGN_CENTER);
+
+  if (image) {
+    if (GetHorizontalAlignment() == Label::ALIGN_CENTER)
+      columns->AddPaddingColumn(1, 0);
+    if (GetHorizontalAlignment() != Label::ALIGN_RIGHT)
+      columns->AddColumn(GridLayout::CENTER, GridLayout::CENTER, 0,
+                         GridLayout::USE_PREF, 0, 0);
+  }
+  if (label) {
+    if (image && GetHorizontalAlignment() != Label::ALIGN_RIGHT)
+      columns->AddPaddingColumn(0, kSpacing);
+    // Caution, centering a wide image and label pair is not well supported.
+    // Either view may appear truncated, and the label will not properly elide.
+    if (image && GetHorizontalAlignment() == Label::ALIGN_CENTER)
+      columns->AddColumn(GridLayout::CENTER, GridLayout::CENTER, 0,
+                         GridLayout::USE_PREF, 0, 0);
+    else
+      columns->AddColumn(GridLayout::FILL, GridLayout::CENTER, 1,
+                         GridLayout::FIXED, 0, 0);
+    if (image && GetHorizontalAlignment() == Label::ALIGN_RIGHT)
+      columns->AddPaddingColumn(0, kSpacing);
+  }
+  if (image) {
+    if (GetHorizontalAlignment() == Label::ALIGN_RIGHT)
+      columns->AddColumn(GridLayout::CENTER, GridLayout::CENTER, 0,
+                         GridLayout::USE_PREF, 0, 0);
+    else if (GetHorizontalAlignment() == Label::ALIGN_CENTER)
+      columns->AddPaddingColumn(1, 0);
+  }
+
+  layout->StartRow(1, 0);
+  if (image && GetHorizontalAlignment() != Label::ALIGN_RIGHT)
+    layout->AddView(image_.get());
+  if (label)
+    layout->AddView(label_.get());
+  if (image && GetHorizontalAlignment() == Label::ALIGN_RIGHT)
+    layout->AddView(image_.get());
+
+  SetState(saved_state);
+}
+
+}  // namespace views