michael@0: package org.mozilla.gecko;
michael@0: 
michael@0: import java.util.EnumSet;
michael@0: 
michael@0: import org.mozilla.gecko.PrefsHelper.PrefHandlerBase;
michael@0: import org.mozilla.gecko.gfx.LayerView;
michael@0: import org.mozilla.gecko.util.ThreadUtils;
michael@0: 
michael@0: import android.os.Bundle;
michael@0: 
michael@0: public class DynamicToolbar {
michael@0:     private static final String STATE_ENABLED = "dynamic_toolbar";
michael@0:     private static final String CHROME_PREF = "browser.chrome.dynamictoolbar";
michael@0: 
michael@0:     // DynamicToolbar is enabled iff prefEnabled is true *and* accessibilityEnabled is false,
michael@0:     // so it is disabled by default on startup. We do not enable it until we explicitly get
michael@0:     // the pref from Gecko telling us to turn it on.
michael@0:     private volatile boolean prefEnabled;
michael@0:     private boolean accessibilityEnabled;
michael@0: 
michael@0:     private final int prefObserverId;
michael@0:     private final EnumSet<PinReason> pinFlags = EnumSet.noneOf(PinReason.class);
michael@0:     private LayerView layerView;
michael@0:     private OnEnabledChangedListener enabledChangedListener;
michael@0: 
michael@0:     public enum PinReason {
michael@0:         RELAYOUT,
michael@0:         ACTION_MODE
michael@0:     }
michael@0: 
michael@0:     public enum VisibilityTransition {
michael@0:         IMMEDIATE,
michael@0:         ANIMATE
michael@0:     }
michael@0: 
michael@0:     /**
michael@0:      * Listener for changes to the dynamic toolbar's enabled state.
michael@0:      */
michael@0:     public interface OnEnabledChangedListener {
michael@0:         /**
michael@0:          * This callback is executed on the UI thread.
michael@0:          */
michael@0:         public void onEnabledChanged(boolean enabled);
michael@0:     }
michael@0: 
michael@0:     public DynamicToolbar() {
michael@0:         // Listen to the dynamic toolbar pref
michael@0:         prefObserverId = PrefsHelper.getPref(CHROME_PREF, new PrefHandler());
michael@0:     }
michael@0: 
michael@0:     public void destroy() {
michael@0:         PrefsHelper.removeObserver(prefObserverId);
michael@0:     }
michael@0: 
michael@0:     public void setLayerView(LayerView layerView) {
michael@0:         ThreadUtils.assertOnUiThread();
michael@0: 
michael@0:         this.layerView = layerView;
michael@0:     }
michael@0: 
michael@0:     public void setEnabledChangedListener(OnEnabledChangedListener listener) {
michael@0:         ThreadUtils.assertOnUiThread();
michael@0: 
michael@0:         enabledChangedListener = listener;
michael@0:     }
michael@0: 
michael@0:     public void onSaveInstanceState(Bundle outState) {
michael@0:         ThreadUtils.assertOnUiThread();
michael@0: 
michael@0:         outState.putBoolean(STATE_ENABLED, prefEnabled);
michael@0:     }
michael@0: 
michael@0:     public void onRestoreInstanceState(Bundle savedInstanceState) {
michael@0:         ThreadUtils.assertOnUiThread();
michael@0: 
michael@0:         if (savedInstanceState != null) {
michael@0:             prefEnabled = savedInstanceState.getBoolean(STATE_ENABLED);
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     public boolean isEnabled() {
michael@0:         ThreadUtils.assertOnUiThread();
michael@0: 
michael@0:         return prefEnabled && !accessibilityEnabled;
michael@0:     }
michael@0: 
michael@0:     public void setAccessibilityEnabled(boolean enabled) {
michael@0:         ThreadUtils.assertOnUiThread();
michael@0: 
michael@0:         if (accessibilityEnabled == enabled) {
michael@0:             return;
michael@0:         }
michael@0: 
michael@0:         // Disable the dynamic toolbar when accessibility features are enabled,
michael@0:         // and re-read the preference when they're disabled.
michael@0:         accessibilityEnabled = enabled;
michael@0:         if (prefEnabled) {
michael@0:             triggerEnabledListener();
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     public void setVisible(boolean visible, VisibilityTransition transition) {
michael@0:         ThreadUtils.assertOnUiThread();
michael@0: 
michael@0:         if (layerView == null) {
michael@0:             return;
michael@0:         }
michael@0: 
michael@0:         final boolean immediate = transition.equals(VisibilityTransition.IMMEDIATE);
michael@0:         if (visible) {
michael@0:             layerView.getLayerMarginsAnimator().showMargins(immediate);
michael@0:         } else {
michael@0:             layerView.getLayerMarginsAnimator().hideMargins(immediate);
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     public void setPinned(boolean pinned, PinReason reason) {
michael@0:         ThreadUtils.assertOnUiThread();
michael@0: 
michael@0:         if (layerView == null) {
michael@0:             return;
michael@0:         }
michael@0: 
michael@0:         if (pinned) {
michael@0:             pinFlags.add(reason);
michael@0:         } else {
michael@0:             pinFlags.remove(reason);
michael@0:         }
michael@0: 
michael@0:         layerView.getLayerMarginsAnimator().setMarginsPinned(!pinFlags.isEmpty());
michael@0:     }
michael@0: 
michael@0:     private void triggerEnabledListener() {
michael@0:         if (enabledChangedListener != null) {
michael@0:             enabledChangedListener.onEnabledChanged(isEnabled());
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     private class PrefHandler extends PrefHandlerBase {
michael@0:         @Override
michael@0:         public void prefValue(String pref, boolean value) {
michael@0:             if (value == prefEnabled) {
michael@0:                 return;
michael@0:             }
michael@0: 
michael@0:             prefEnabled = value;
michael@0: 
michael@0:             ThreadUtils.postToUiThread(new Runnable() {
michael@0:                 @Override
michael@0:                 public void run() {
michael@0:                     // If accessibility is enabled, the dynamic toolbar is
michael@0:                     // forced to be off.
michael@0:                     if (!accessibilityEnabled) {
michael@0:                         triggerEnabledListener();
michael@0:                     }
michael@0:                 }
michael@0:             });
michael@0:         }
michael@0: 
michael@0:         @Override
michael@0:         public boolean isObserver() {
michael@0:             // We want to be notified of changes to be able to switch mode
michael@0:             // without restarting.
michael@0:             return true;
michael@0:         }
michael@0:     }
michael@0: }