chrome/browser/android/accessibility/font_size_prefs_android.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CHROME_BROWSER_ANDROID_ACCESSIBILITY_FONT_SIZE_PREFS_ANDROID_H_
   6 #define CHROME_BROWSER_ANDROID_ACCESSIBILITY_FONT_SIZE_PREFS_ANDROID_H_
   7
   8 #include <jni.h>
   9 #include "base/android/scoped_java_ref.h"
  10 #include "base/observer_list.h"
  11
  12 class PrefChangeRegistrar;
  13 class PrefService;
  14
  15 /*
  16  * Native implementation of FontSizePrefs. This class is used to get and set
  17  * FontScaleFactor and ForceEnableZoom.
  18  */
  19 class FontSizePrefsAndroid {
  20  public:
  21   class Observer {
  22    public:
  23     virtual void OnChangeFontSize(float font) = 0;
  24     virtual void OnChangeForceEnableZoom(bool enabled) = 0;
  25   };
  26
  27   FontSizePrefsAndroid(JNIEnv* env, jobject obj);
  28   ~FontSizePrefsAndroid();
  29
  30   void SetFontScaleFactor(JNIEnv* env, jobject obj, jfloat font);
  31   float GetFontScaleFactor(JNIEnv* env, jobject obj);
  32   void SetForceEnableZoom(JNIEnv* env, jobject obj, jboolean enabled);
  33   bool GetForceEnableZoom(JNIEnv* env, jobject obj);
  34
  35   void AddObserver(JNIEnv* env, jobject obj, jlong obs);
  36   void RemoveObserver(JNIEnv* env, jobject obj, jlong obs);
  37
  38   static bool Register(JNIEnv* env);
  39
  40  private:
  41   // Callback for FontScaleFactor changes from pref change registrar.
  42   void OnFontScaleFactorPrefsChanged();
  43   // Callback for ForceEnableZoom changes from pref change registrar.
  44   void OnForceEnableZoomPrefsChanged();
  45
  46   scoped_ptr<PrefChangeRegistrar> pref_change_registrar_;
  47   PrefService* const pref_service_;
  48   base::ObserverList<Observer> observers_;
  49   base::android::ScopedJavaGlobalRef<jobject> java_ref_;
  50
  51   DISALLOW_COPY_AND_ASSIGN(FontSizePrefsAndroid);
  52 };
  53
  54 /*
  55  * Native implementation of FontSizePrefsObserverWrapper. Adds observer support
  56  * for FontSizePrefs.
  57  */
  58 class FontSizePrefsObserverAndroid : public FontSizePrefsAndroid::Observer {
  59  public:
  60   FontSizePrefsObserverAndroid(JNIEnv* env, jobject obj);
  61   virtual ~FontSizePrefsObserverAndroid();
  62   void DestroyObserverAndroid(JNIEnv* env, jobject obj);
  63
  64   static bool Register(JNIEnv* env);
  65
  66   // FontSizePrefs::Observer implementation.
  67   void OnChangeFontSize(float font) override;
  68   void OnChangeForceEnableZoom(bool enabled) override;
  69
  70  private:
  71   base::android::ScopedJavaGlobalRef<jobject> java_ref_;
  72 };
  73
  74 #endif  // CHROME_BROWSER_ANDROID_ACCESSIBILITY_FONT_SIZE_PREFS_ANDROID_H_