The Tor Browser: mobile/android/base/DynamicToolbar.java@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 package org.mozilla.gecko;

     3 import java.util.EnumSet;

     5 import org.mozilla.gecko.PrefsHelper.PrefHandlerBase;

     6 import org.mozilla.gecko.gfx.LayerView;

     7 import org.mozilla.gecko.util.ThreadUtils;

     9 import android.os.Bundle;

    11 public class DynamicToolbar {

    12     private static final String STATE_ENABLED = "dynamic_toolbar";

    13     private static final String CHROME_PREF = "browser.chrome.dynamictoolbar";

    15     // DynamicToolbar is enabled iff prefEnabled is true *and* accessibilityEnabled is false,

    16     // so it is disabled by default on startup. We do not enable it until we explicitly get

    17     // the pref from Gecko telling us to turn it on.

    18     private volatile boolean prefEnabled;

    19     private boolean accessibilityEnabled;

    21     private final int prefObserverId;

    22     private final EnumSet<PinReason> pinFlags = EnumSet.noneOf(PinReason.class);

    23     private LayerView layerView;

    24     private OnEnabledChangedListener enabledChangedListener;

    26     public enum PinReason {

    27         RELAYOUT,

    28         ACTION_MODE

    29     }

    31     public enum VisibilityTransition {

    32         IMMEDIATE,

    33         ANIMATE

    34     }

    36     /**

    37      * Listener for changes to the dynamic toolbar's enabled state.

    38      */

    39     public interface OnEnabledChangedListener {

    40         /**

    41          * This callback is executed on the UI thread.

    42          */

    43         public void onEnabledChanged(boolean enabled);

    44     }

    46     public DynamicToolbar() {

    47         // Listen to the dynamic toolbar pref

    48         prefObserverId = PrefsHelper.getPref(CHROME_PREF, new PrefHandler());

    49     }

    51     public void destroy() {

    52         PrefsHelper.removeObserver(prefObserverId);

    53     }

    55     public void setLayerView(LayerView layerView) {

    56         ThreadUtils.assertOnUiThread();

    58         this.layerView = layerView;

    59     }

    61     public void setEnabledChangedListener(OnEnabledChangedListener listener) {

    62         ThreadUtils.assertOnUiThread();

    64         enabledChangedListener = listener;

    65     }

    67     public void onSaveInstanceState(Bundle outState) {

    68         ThreadUtils.assertOnUiThread();

    70         outState.putBoolean(STATE_ENABLED, prefEnabled);

    71     }

    73     public void onRestoreInstanceState(Bundle savedInstanceState) {

    74         ThreadUtils.assertOnUiThread();

    76         if (savedInstanceState != null) {

    77             prefEnabled = savedInstanceState.getBoolean(STATE_ENABLED);

    78         }

    79     }

    81     public boolean isEnabled() {

    82         ThreadUtils.assertOnUiThread();

    84         return prefEnabled && !accessibilityEnabled;

    85     }

    87     public void setAccessibilityEnabled(boolean enabled) {

    88         ThreadUtils.assertOnUiThread();

    90         if (accessibilityEnabled == enabled) {

    91             return;

    92         }

    94         // Disable the dynamic toolbar when accessibility features are enabled,

    95         // and re-read the preference when they're disabled.

    96         accessibilityEnabled = enabled;

    97         if (prefEnabled) {

    98             triggerEnabledListener();

    99         }

   100     }

   102     public void setVisible(boolean visible, VisibilityTransition transition) {

   103         ThreadUtils.assertOnUiThread();

   105         if (layerView == null) {

   106             return;

   107         }

   109         final boolean immediate = transition.equals(VisibilityTransition.IMMEDIATE);

   110         if (visible) {

   111             layerView.getLayerMarginsAnimator().showMargins(immediate);

   112         } else {

   113             layerView.getLayerMarginsAnimator().hideMargins(immediate);

   114         }

   115     }

   117     public void setPinned(boolean pinned, PinReason reason) {

   118         ThreadUtils.assertOnUiThread();

   120         if (layerView == null) {

   121             return;

   122         }

   124         if (pinned) {

   125             pinFlags.add(reason);

   126         } else {

   127             pinFlags.remove(reason);

   128         }

   130         layerView.getLayerMarginsAnimator().setMarginsPinned(!pinFlags.isEmpty());

   131     }

   133     private void triggerEnabledListener() {

   134         if (enabledChangedListener != null) {

   135             enabledChangedListener.onEnabledChanged(isEnabled());

   136         }

   137     }

   139     private class PrefHandler extends PrefHandlerBase {

   140         @Override

   141         public void prefValue(String pref, boolean value) {

   142             if (value == prefEnabled) {

   143                 return;

   144             }

   146             prefEnabled = value;

   148             ThreadUtils.postToUiThread(new Runnable() {

   149                 @Override

   150                 public void run() {

   151                     // If accessibility is enabled, the dynamic toolbar is

   152                     // forced to be off.

   153                     if (!accessibilityEnabled) {

   154                         triggerEnabledListener();

   155                     }

   156                 }

   157             });

   158         }

   160         @Override

   161         public boolean isObserver() {

   162             // We want to be notified of changes to be able to switch mode

   163             // without restarting.

   164             return true;

   165         }

   166     }

   167 }

The Tor Browser / file revision