Move views::Label DisabledColor logic into views::LabelButtonLabel

ui/views/controls/button/label_button_label.h

+// Copyright 2017 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.
+
+#ifndef UI_VIEWS_CONTROLS_BUTTON_LABEL_BUTTON_LABEL_H_
+#define UI_VIEWS_CONTROLS_BUTTON_LABEL_BUTTON_LABEL_H_
+
+#include "base/macros.h"
+#include "base/strings/string16.h"
+#include "third_party/skia/include/core/SkColor.h"
+#include "ui/views/controls/label.h"
+#include "ui/views/views_export.h"
+
+namespace views {
+
+// A Label subclass that can be disabled. This is only used internally for
+// views::LabelButton.
+class VIEWS_EXPORT LabelButtonLabel : public Label {
+ public:
+  LabelButtonLabel(const base::string16& text, int text_context);
+  ~LabelButtonLabel() override;
+
+  // Set an explicit disabled color. This will stop the Label responding to
+  // changes in the native theme for disabled colors.
+  void SetDisabledColor(SkColor color);
+
+  // Label:
+  void SetEnabledColor(SkColor color) override;
+
+ protected:
+  // Label:
+  void OnEnabledChanged() override;
+  void OnNativeThemeChanged(const ui::NativeTheme* theme) override;
+
+ private:
+  void SetColorForEnableState();
+
+  SkColor requested_disabled_color_ = SK_ColorRED;
+  SkColor requested_enabled_color_ = SK_ColorRED;
+  bool disabled_color_set_ = false;
+  bool enabled_color_set_ = false;
+
+  DISALLOW_COPY_AND_ASSIGN(LabelButtonLabel);
+};
+
+}  // namespace views
+
+#endif  // UI_VIEWS_CONTROLS_BUTTON_LABEL_BUTTON_LABEL_H_