Example usage for android.view ViewTreeObserver addOnGlobalFocusChangeListener

Introduction

In this page you can find the example usage for android.view ViewTreeObserver addOnGlobalFocusChangeListener.

Prototype

public void addOnGlobalFocusChangeListener(OnGlobalFocusChangeListener listener) 

Source Link

Document

Register a callback to be invoked when the focus state within the view tree changes.

Usage

From source file:eu.inmite.android.lib.validations.form.FormValidator.java

/**
 * Start live validation - whenever focus changes from view with validations upon itself, validators will run.<br/>
  * Don't forget to call {@link #stopLiveValidation(Object)} once you are done.
 *
 * @param target target with views to validate, there can be only one continuous validation per target
 * @param formContainer view that contains our form (views to validate)
 * @param callback callback invoked whenever there is some validation fail, can be null
        //  w ww  . j ava 2s .  c  o  m
 * @throws IllegalArgumentException if formContainer or target is null
 */
public static void startLiveValidation(final Object target, final View formContainer,
        final IValidationCallback callback) {
    if (formContainer == null) {
        throw new IllegalArgumentException("form container view cannot be null");
    }
    if (target == null) {
        throw new IllegalArgumentException("target cannot be null");
    }

    if (sLiveValidations == null) {
        sLiveValidations = new HashMap<Object, ViewGlobalFocusChangeListener>();
    } else if (sLiveValidations.containsKey(target)) {
        // validation is already running
        return;
    }

    final Map<View, FieldInfo> infoMap = FieldFinder.getFieldsForTarget(target);
    final ViewGlobalFocusChangeListener listener = new ViewGlobalFocusChangeListener(infoMap, formContainer,
            target, callback);
    final ViewTreeObserver observer = formContainer.getViewTreeObserver();
    observer.addOnGlobalFocusChangeListener(listener);

    sLiveValidations.put(target, listener);
}

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From source file:com.vuze.android.remote.fragment.TorrentListFragment.java

private void setupSideListArea(View view) {
    sideListArea = (LinearLayout) view.findViewById(R.id.sidelist_layout);
    if (sideListArea == null) {
        return;//from   w  w  w .  j  a  v a  2 s.  c  om
    }

    FragmentActivity activity = getActivity();
    if (activity instanceof TorrentViewActivity) {
        ((TorrentViewActivity) activity).setBottomToolbarEnabled(false);
        ((TorrentViewActivity) activity).setShowGlobalActionBar(false);
    }

    if (!AndroidUtils.hasTouchScreen()) {
        // Switch SideList width based on focus.  For touch screens, we use
        // touch events.  For non-touch screens (TV) we watch for focus changes
        ViewTreeObserver vto = sideListArea.getViewTreeObserver();
        vto.addOnGlobalFocusChangeListener(new ViewTreeObserver.OnGlobalFocusChangeListener() {

            @Override
            public void onGlobalFocusChanged(View oldFocus, View newFocus) {

                boolean isChildOfSideList = isChildOf(newFocus, sideListArea);
                boolean isHeader = childOrParentHasTag(newFocus, "sideheader");
                if ((sidelistIsExpanded == null || sidelistIsExpanded) && !isChildOfSideList) {
                    //left focus
                    sidelistInFocus = false;
                    expandSideListWidth(false);
                } else if ((sidelistIsExpanded == null || !sidelistIsExpanded) && isHeader
                        && newFocus != listSideFilter) {
                    sidelistInFocus = true;
                    expandSideListWidth(true);
                }
            }
        });
    }

    if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.HONEYCOMB) {
        LayoutTransition layoutTransition = new LayoutTransition();
        layoutTransition.setDuration(300);
        sideListArea.setLayoutTransition(layoutTransition);
    }

    // Could have used a ExpandableListView.. oh well
    setupExpando(view, R.id.sidesort_header, R.id.sidesort_list);
    setupExpando(view, R.id.sidetag_header, R.id.sidetag_list);
    setupExpando(view, R.id.sidefilter_header, R.id.sidefilter_list);
    setupExpando(view, R.id.sideactions_header, R.id.sideactions_list);

    setupSideFilter(view);
    setupSideTags(view);
    setupSideSort(view);
    setupSideActions(view);
}

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