Example usage for android.support.v4.view.accessibility AccessibilityRecordCompat getFromIndex

Introduction

In this page you can find the example usage for android.support.v4.view.accessibility AccessibilityRecordCompat getFromIndex.

Prototype

public int getFromIndex() 

Source Link

Document

Gets the index of the first character of the changed sequence, or the beginning of a text selection or the index of the first visible item when scrolling.

Usage

From source file:com.google.android.marvin.mytalkback.ProcessorFocusAndSingleTap.java

/**
 * Attempts to place focus on the {@code event}'s selected item.
 *//* w  ww  .j a  va  2 s.co m*/
private boolean setFocusFromViewSelected(AccessibilityEvent event, AccessibilityRecordCompat record) {
    AccessibilityNodeInfoCompat source = null;
    AccessibilityNodeInfoCompat child = null;

    try {
        source = record.getSource();
        if (source == null) {
            return false;
        }

        final int index = (record.getCurrentItemIndex() - record.getFromIndex());
        if ((index < 0) || (index >= source.getChildCount())) {
            return false;
        }

        child = source.getChild(index);
        if (child == null) {
            return false;
        }

        if (!AccessibilityNodeInfoUtils.isTopLevelScrollItem(mService, child)) {
            return false;
        }

        return tryFocusing(child);
    } finally {
        AccessibilityNodeInfoUtils.recycleNodes(source, child);
    }
}

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From source file:com.android.screenspeak.eventprocessor.ProcessorFocusAndSingleTap.java

/**
 * @param record the AccessbilityRecord for the event
 * @param isViewFocusedEvent true if the event is TYPE_VIEW_FOCUSED, otherwise it is
 * TYPE_VIEW_SELECTED.//from   w w w.j  ava 2s .  co  m
 */
private boolean setFocusOnView(AccessibilityRecordCompat record, boolean isViewFocusedEvent) {
    AccessibilityNodeInfoCompat source = null;
    AccessibilityNodeInfoCompat existing = null;
    AccessibilityNodeInfoCompat child = null;

    try {
        source = record.getSource();
        if (source == null) {
            return false;
        }

        if (record.getItemCount() > 0) {
            final int index = (record.getCurrentItemIndex() - record.getFromIndex());
            if (index >= 0 && index < source.getChildCount()) {
                child = source.getChild(index);
                if (child != null) {
                    if (AccessibilityNodeInfoUtils.isTopLevelScrollItem(child) && tryFocusing(child)) {
                        return true;
                    }
                }
            }
        }

        if (!isViewFocusedEvent) {
            return false;
        }

        // Logic below is only specific to TYPE_VIEW_FOCUSED event
        // Try focusing the source node.
        if (tryFocusing(source)) {
            return true;
        }

        // If we fail and the source node already contains focus, abort.
        existing = source.findFocus(AccessibilityNodeInfo.FOCUS_ACCESSIBILITY);
        if (existing != null) {
            return false;
        }

        // If we fail to focus a node, perhaps because it is a focusable
        // but non-speaking container, we should still attempt to place
        // focus on a speaking child within the container.
        child = AccessibilityNodeInfoUtils.searchFromBfs(source,
                AccessibilityNodeInfoUtils.FILTER_SHOULD_FOCUS);
        return child != null && tryFocusing(child);

    } finally {
        AccessibilityNodeInfoUtils.recycleNodes(source, existing, child);
    }
}

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From source file:com.android.screenspeak.eventprocessor.ProcessorFocusAndSingleTap.java

private void handleViewScrolled(AccessibilityEvent event, AccessibilityRecordCompat record) {
    AccessibilityNodeInfoCompat source = null;

    int movingDirection;
    boolean wasScrollAction = false;
    if (mActionScrolledNode != null) {
        source = record.getSource();/*from   w w  w.  j  a  v  a  2 s. c om*/
        if (source == null)
            return;
        if (source.equals(mActionScrolledNode)) {
            movingDirection = getScrollActionDirection(mLastScrollAction);
            wasScrollAction = mLastScrollAction != 0;
            clearScrollAction();
        } else {
            movingDirection = getScrollDirection(event);
        }
    } else {
        movingDirection = getScrollDirection(event);
    }

    followScrollEvent(source, record, movingDirection, wasScrollAction);

    mLastScrollFromIndex = record.getFromIndex();
    mLastScrollToIndex = record.getToIndex();
    mLastScrollX = record.getScrollX();
    mLastScrollY = record.getScrollY();

    tryFocusCachedRecord();
}

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From source file:com.android.talkback.eventprocessor.ProcessorFocusAndSingleTap.java

private void handleViewScrolled(AccessibilityEvent event, AccessibilityRecordCompat record) {
    AccessibilityNodeInfoCompat source = null;

    @TraversalStrategy.SearchDirectionOrUnknown
    int direction;
    boolean wasScrollAction;
    if (mActionScrolledNode != null) {
        source = record.getSource();/*  w  w w. ja va 2s  . c o  m*/
        if (source == null)
            return;
        if (source.equals(mActionScrolledNode)) {
            direction = mLastScrollDirection;
            wasScrollAction = true;
            clearScrollAction();
        } else {
            direction = getScrollDirection(event);
            wasScrollAction = false;
        }
    } else {
        direction = getScrollDirection(event);
        wasScrollAction = false;
    }

    followScrollEvent(source, record, direction, wasScrollAction);

    mLastScrollFromIndex = record.getFromIndex();
    mLastScrollToIndex = record.getToIndex();
    mLastScrollX = record.getScrollX();
    mLastScrollY = record.getScrollY();

    tryFocusCachedRecord();
}

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From source file:com.google.android.marvin.mytalkback.ProcessorFocusAndSingleTap.java

private void handleViewScrolled(AccessibilityEvent event, AccessibilityRecordCompat record) {
    mLastViewScrolledEvent = event.getEventTime();

    final AccessibilityNodeInfoCompat source = record.getSource();
    if (source == null) {
        LogUtils.log(this, Log.ERROR, "Drop scroll with no source node");
        return;//from   ww w  . j  a v a 2s. c  o  m
    }

    // Only move focus if we've already seen the source.
    if (source.equals(mLastScrollSource)) {
        final boolean isMovingForward = (mLastScrollAction == AccessibilityNodeInfo.ACTION_SCROLL_FORWARD)
                || (event.getFromIndex() > mLastScrollFromIndex) || (event.getToIndex() > mLastScrollToIndex);
        final boolean wasScrollAction = (mLastScrollAction != 0);
        mHandler.followScrollDelayed(source, isMovingForward, wasScrollAction);

        // Performing a scroll action results in smooth scrolling, which may
        // send multiple events spaced at least 100ms apart.
        mHandler.clearScrollActionDelayed();
    } else {
        setScrollActionImmediately(0);
    }

    if (mLastScrollSource != null) {
        mLastScrollSource.recycle();
    }

    mLastScrollSource = source;
    mLastScrollFromIndex = record.getFromIndex();
    mLastScrollToIndex = record.getToIndex();
}

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