Upstream accessibility font size preferences.

chrome/browser/android/accessibility/font_size_prefs_android.h

+// Copyright (c) 2014 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 CHROME_BROWSER_ANDROID_ACCESSIBILITY_FONT_SIZE_PREFS_ANDROID_H_
+#define CHROME_BROWSER_ANDROID_ACCESSIBILITY_FONT_SIZE_PREFS_ANDROID_H_
+
+#include <jni.h>
+#include "base/android/scoped_java_ref.h"
+#include "base/observer_list.h"
+
+class PrefChangeRegistrar;
+class PrefService;
+
+/*
+ * Native implementation of FontSizePrefs. This class is used to get and set
+ * FontScaleFactor and ForceEnableZoom.
+ */
+class FontSizePrefsAndroid {
+ public:
+  class Observer {
+   public:
+    virtual void OnChangeFontSize(float font) = 0;
+    virtual void OnChangeForceEnableZoom(bool enabled) = 0;
+  };
+
+  FontSizePrefsAndroid(JNIEnv* env, jobject obj);
+  ~FontSizePrefsAndroid();
+  void Destroy(JNIEnv* env, jobject obj);
+
+  void SetFontScaleFactor(JNIEnv* env, jobject obj, jfloat font);
+  float GetFontScaleFactor(JNIEnv* env, jobject obj);
+  void SetForceEnableZoom(JNIEnv* env, jobject obj, jboolean enabled);
+  bool GetForceEnableZoom(JNIEnv* env, jobject obj);
+
+  void AddObserver(JNIEnv* env, jobject obj, jlong obs);
+  void RemoveObserver(JNIEnv* env, jobject obj, jlong obs);
+
+  static bool Register(JNIEnv* env);
+
+ private:
+  // Callback for FontScaleFactor changes from pref change registrar.
+  void OnFontScaleFactorPrefsChanged();
+  // Callback for ForceEnableZoom changes from pref change registrar.
+  void OnForceEnableZoomPrefsChanged();
+
+  scoped_ptr<PrefChangeRegistrar> pref_change_registrar_;
+  PrefService* const pref_service_;
+  ObserverList<Observer> observers_;
+  base::android::ScopedJavaGlobalRef<jobject> java_ref_;
+
+  DISALLOW_COPY_AND_ASSIGN(FontSizePrefsAndroid);
+};
+
+/*
+ * Native implementation of FontSizePrefsObserverWrapper. Adds observer support
+ * for FontSizePrefs.
+ */
+class FontSizePrefsObserverAndroid : public FontSizePrefsAndroid::Observer {
+ public:
+  FontSizePrefsObserverAndroid(JNIEnv* env, jobject obj);
+  virtual ~FontSizePrefsObserverAndroid();
+  void DestroyObserverAndroid(JNIEnv* env, jobject obj);
+
+  static bool Register(JNIEnv* env);
+
+  // FontSizePrefs::Observer implementation.
+  virtual void OnChangeFontSize(float font) OVERRIDE;
+  virtual void OnChangeForceEnableZoom(bool enabled) OVERRIDE;
+
+ private:
+  base::android::ScopedJavaGlobalRef<jobject> java_ref_;
+};
+
+#endif  // CHROME_BROWSER_ANDROID_ACCESSIBILITY_FONT_SIZE_PREFS_ANDROID_H_