Example usage for android.view Gravity TOP

Introduction

In this page you can find the example usage for android.view Gravity TOP.

Prototype

int TOP

To view the source code for android.view Gravity TOP.

Click Source Link

Document

Push object to the top of its container, not changing its size.

Usage

From source file:com.example.verticaldrawerlayout.VerticalDrawerLayout.java

/**
 * Close the specified drawer view by animating it into view.
 * //from   w w  w .  jav  a2  s .com
 * @param drawerView
 *            Drawer view to close
 */
public void closeDrawer(View drawerView) {
    if (!isDrawerView(drawerView)) {
        throw new IllegalArgumentException("View " + drawerView + " is not a sliding drawer");
    }

    if (mFirstLayout) {
        final LayoutParams lp = (LayoutParams) drawerView.getLayoutParams();
        lp.onScreen = 0.f;
        lp.knownOpen = false;
    } else {
        if (checkDrawerViewAbsoluteGravity(drawerView, Gravity.TOP)) {
            mTopDragger.smoothSlideViewTo(drawerView, drawerView.getLeft(), -drawerView.getHeight());
        } else {
            mBottomDragger.smoothSlideViewTo(drawerView, drawerView.getLeft(), getHeight());
        }
    }
    invalidate();
}

---

From source file:android.support.design.widget.CoordinatorLayout.java

/**
 * Lay out a child view with respect to a keyline.
 *
 * <p>The keyline represents a horizontal offset from the unpadded starting edge of
 * the CoordinatorLayout. The child's gravity will affect how it is positioned with
 * respect to the keyline.</p>// w  w  w.  j  a v a 2 s  . c om
 *
 * @param child child to lay out
 * @param keyline offset from the starting edge in pixels of the keyline to align with
 * @param layoutDirection ViewCompat constant for layout direction
 */
private void layoutChildWithKeyline(View child, int keyline, int layoutDirection) {
    final LayoutParams lp = (LayoutParams) child.getLayoutParams();
    final int absGravity = GravityCompat.getAbsoluteGravity(resolveKeylineGravity(lp.gravity), layoutDirection);

    final int hgrav = absGravity & Gravity.HORIZONTAL_GRAVITY_MASK;
    final int vgrav = absGravity & Gravity.VERTICAL_GRAVITY_MASK;
    final int width = getWidth();
    final int height = getHeight();
    final int childWidth = child.getMeasuredWidth();
    final int childHeight = child.getMeasuredHeight();

    if (layoutDirection == ViewCompat.LAYOUT_DIRECTION_RTL) {
        keyline = width - keyline;
    }

    int left = getKeyline(keyline) - childWidth;
    int top = 0;

    switch (hgrav) {
    default:
    case Gravity.LEFT:
        // Nothing to do.
        break;
    case Gravity.RIGHT:
        left += childWidth;
        break;
    case Gravity.CENTER_HORIZONTAL:
        left += childWidth / 2;
        break;
    }

    switch (vgrav) {
    default:
    case Gravity.TOP:
        // Do nothing, we're already in position.
        break;
    case Gravity.BOTTOM:
        top += childHeight;
        break;
    case Gravity.CENTER_VERTICAL:
        top += childHeight / 2;
        break;
    }

    // Obey margins and padding
    left = Math.max(getPaddingLeft() + lp.leftMargin,
            Math.min(left, width - getPaddingRight() - childWidth - lp.rightMargin));
    top = Math.max(getPaddingTop() + lp.topMargin,
            Math.min(top, height - getPaddingBottom() - childHeight - lp.bottomMargin));

    child.layout(left, top, left + childWidth, top + childHeight);
}

---

From source file:com.gome.ecmall.custom.VerticalViewPager.java

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    // For simple implementation, or internal size is always 0.
    // We depend on the container to specify the layout size of
    // our view. We can't really know what it is since we will be
    // adding and removing different arbitrary views and do not
    // want the layout to change as this happens.
    setMeasuredDimension(getDefaultSize(0, widthMeasureSpec), getDefaultSize(0, heightMeasureSpec));

    // final int measuredWidth = getMeasuredWidth();
    final int measuredHeight = getMeasuredHeight();
    final int maxGutterSize = measuredHeight / 10;
    mGutterSize = Math.min(maxGutterSize, mDefaultGutterSize);

    // Children are just made to fill our space.
    // int childWidthSize = measuredWidth - getPaddingLeft()
    // - getPaddingRight();
    // int childHeightSize = getMeasuredHeight() - getPaddingTop()
    // - getPaddingBottom();

    int childWidthSize = getMeasuredWidth() - getPaddingLeft() - getPaddingRight();
    int childHeightSize = measuredHeight - getPaddingTop() - getPaddingBottom();

    /*//from w ww .  jav  a 2s.co m
     * Make sure all children have been properly measured. Decor views first. Right now we cheat and make this less
     * complicated by assuming decor views won't intersect. We will pin to edges based on gravity.
     */
    int size = getChildCount();
    for (int i = 0; i < size; ++i) {
        final View child = getChildAt(i);
        if (child.getVisibility() != GONE) {
            final LayoutParams lp = (LayoutParams) child.getLayoutParams();
            if (lp != null && lp.isDecor) {
                final int hgrav = lp.gravity & Gravity.HORIZONTAL_GRAVITY_MASK;
                final int vgrav = lp.gravity & Gravity.VERTICAL_GRAVITY_MASK;
                int widthMode = MeasureSpec.AT_MOST;
                int heightMode = MeasureSpec.AT_MOST;
                boolean consumeVertical = vgrav == Gravity.TOP || vgrav == Gravity.BOTTOM;
                boolean consumeHorizontal = hgrav == Gravity.LEFT || hgrav == Gravity.RIGHT;

                if (consumeVertical) {
                    widthMode = MeasureSpec.EXACTLY;
                } else if (consumeHorizontal) {
                    heightMode = MeasureSpec.EXACTLY;
                }

                int widthSize = childWidthSize;
                int heightSize = childHeightSize;
                if (lp.width != LayoutParams.WRAP_CONTENT) {
                    widthMode = MeasureSpec.EXACTLY;
                    if (lp.width != LayoutParams.MATCH_PARENT) {
                        widthSize = lp.width;
                    }
                }
                if (lp.height != LayoutParams.WRAP_CONTENT) {
                    heightMode = MeasureSpec.EXACTLY;
                    if (lp.height != LayoutParams.MATCH_PARENT) {
                        heightSize = lp.height;
                    }
                }
                final int widthSpec = MeasureSpec.makeMeasureSpec(widthSize, widthMode);
                final int heightSpec = MeasureSpec.makeMeasureSpec(heightSize, heightMode);
                child.measure(widthSpec, heightSpec);

                if (consumeVertical) {
                    childHeightSize -= child.getMeasuredHeight();
                } else if (consumeHorizontal) {
                    childWidthSize -= child.getMeasuredWidth();
                }
            }
        }
    }

    mChildWidthMeasureSpec = MeasureSpec.makeMeasureSpec(childWidthSize, MeasureSpec.EXACTLY);
    mChildHeightMeasureSpec = MeasureSpec.makeMeasureSpec(childHeightSize, MeasureSpec.EXACTLY);

    // Make sure we have created all fragments that we need to have shown.
    mInLayout = true;
    populate();
    mInLayout = false;

    // Page views next.
    size = getChildCount();
    for (int i = 0; i < size; ++i) {
        final View child = getChildAt(i);
        if (child.getVisibility() != GONE) {
            if (DEBUG)
                Log.v(TAG, "Measuring #" + i + " " + child + ": " + mChildWidthMeasureSpec);

            final LayoutParams lp = (LayoutParams) child.getLayoutParams();
            if (lp == null || !lp.isDecor) {
                // final int widthSpec = MeasureSpec.makeMeasureSpec(
                // (int) (childWidthSize * lp.heightFactor),
                // MeasureSpec.EXACTLY);
                final int heightSpec = MeasureSpec.makeMeasureSpec((int) (childHeightSize * lp.heightFactor),
                        MeasureSpec.EXACTLY);
                child.measure(mChildWidthMeasureSpec, heightSpec);
            }
        }
    }
}

---

From source file:android.support.v17.leanback.widget.GuidedActionsStylist.java

/**
 * Start transition to expand or collapse GuidedActionStylist.
 * @param avh When not null, the GuidedActionStylist expands the sub actions of avh.  When null
 * the GuidedActionStylist will collapse sub actions.
 *//*from   ww  w. j  a  v  a  2  s.  c o  m*/
public void startExpandedTransition(ViewHolder avh) {
    ViewHolder focusAvh = null; // expand / collapse view holder
    final int count = mActionsGridView.getChildCount();
    for (int i = 0; i < count; i++) {
        ViewHolder vh = (ViewHolder) mActionsGridView.getChildViewHolder(mActionsGridView.getChildAt(i));
        if (avh == null && vh.itemView.getVisibility() == View.VISIBLE) {
            // going to collapse this one.
            focusAvh = vh;
            break;
        } else if (avh != null && vh.getAction() == avh.getAction()) {
            // going to expand this one.
            focusAvh = vh;
            break;
        }
    }
    if (focusAvh == null) {
        // huh?
        onUpdateExpandedViewHolder(avh);
        return;
    }
    boolean isSubActionTransition = focusAvh.getAction().hasSubActions();
    Object set = TransitionHelper.createTransitionSet(false);
    float slideDistance = isSubActionTransition ? focusAvh.itemView.getHeight()
            : focusAvh.itemView.getHeight() * 0.5f;
    Object slideAndFade = TransitionHelper.createFadeAndShortSlide(Gravity.TOP | Gravity.BOTTOM, slideDistance);
    Object changeFocusItemTransform = TransitionHelper.createChangeTransform();
    Object changeFocusItemBounds = TransitionHelper.createChangeBounds(false);
    Object fade = TransitionHelper.createFadeTransition(TransitionHelper.FADE_IN | TransitionHelper.FADE_OUT);
    Object changeGridBounds = TransitionHelper.createChangeBounds(false);
    if (avh == null) {
        TransitionHelper.setStartDelay(slideAndFade, 150);
        TransitionHelper.setStartDelay(changeFocusItemTransform, 100);
        TransitionHelper.setStartDelay(changeFocusItemBounds, 100);
    } else {
        TransitionHelper.setStartDelay(fade, 100);
        TransitionHelper.setStartDelay(changeGridBounds, 100);
        TransitionHelper.setStartDelay(changeFocusItemTransform, 50);
        TransitionHelper.setStartDelay(changeFocusItemBounds, 50);
    }
    for (int i = 0; i < count; i++) {
        ViewHolder vh = (ViewHolder) mActionsGridView.getChildViewHolder(mActionsGridView.getChildAt(i));
        if (vh == focusAvh) {
            // going to expand/collapse this one.
            if (isSubActionTransition) {
                TransitionHelper.include(changeFocusItemTransform, vh.itemView);
                TransitionHelper.include(changeFocusItemBounds, vh.itemView);
            }
        } else {
            // going to slide this item to top / bottom.
            TransitionHelper.include(slideAndFade, vh.itemView);
            TransitionHelper.exclude(fade, vh.itemView, true);
        }
    }
    TransitionHelper.include(changeGridBounds, mSubActionsGridView);
    TransitionHelper.addTransition(set, slideAndFade);
    // note that we don't run ChangeBounds for activating view due to the rounding problem
    // of multiple level views ChangeBounds animation causing vertical jittering.
    if (isSubActionTransition) {
        TransitionHelper.addTransition(set, changeFocusItemTransform);
        TransitionHelper.addTransition(set, changeFocusItemBounds);
    }
    TransitionHelper.addTransition(set, fade);
    TransitionHelper.addTransition(set, changeGridBounds);
    mExpandTransition = set;
    TransitionHelper.addTransitionListener(mExpandTransition, new TransitionListener() {
        @Override
        public void onTransitionEnd(Object transition) {
            mExpandTransition = null;
        }
    });
    if (avh != null && mSubActionsGridView.getTop() != avh.itemView.getTop()) {
        // For expanding, set the initial position of subActionsGridView before running
        // a ChangeBounds on it.
        final ViewHolder toUpdate = avh;
        mSubActionsGridView.addOnLayoutChangeListener(new View.OnLayoutChangeListener() {
            @Override
            public void onLayoutChange(View v, int left, int top, int right, int bottom, int oldLeft,
                    int oldTop, int oldRight, int oldBottom) {
                if (mSubActionsGridView == null) {
                    return;
                }
                mSubActionsGridView.removeOnLayoutChangeListener(this);
                mMainView.post(new Runnable() {
                    public void run() {
                        if (mMainView == null) {
                            return;
                        }
                        TransitionHelper.beginDelayedTransition(mMainView, mExpandTransition);
                        onUpdateExpandedViewHolder(toUpdate);
                    }
                });
            }
        });
        ViewGroup.MarginLayoutParams lp = (ViewGroup.MarginLayoutParams) mSubActionsGridView.getLayoutParams();
        lp.topMargin = avh.itemView.getTop();
        lp.height = 0;
        mSubActionsGridView.setLayoutParams(lp);
        return;
    }
    TransitionHelper.beginDelayedTransition(mMainView, mExpandTransition);
    onUpdateExpandedViewHolder(avh);
}

---

From source file:com.actionbarsherlock.custom.widget.VerticalDrawerLayout.java

@Override
protected void onRestoreInstanceState(Parcelable state) {
    final SavedState ss = (SavedState) state;
    super.onRestoreInstanceState(ss.getSuperState());

    if (ss.openDrawerGravity != Gravity.NO_GRAVITY) {
        final View toOpen = findDrawerWithGravity(ss.openDrawerGravity);
        if (toOpen != null) {
            openDrawer(toOpen);/*from ww  w.jav  a  2 s .  co m*/
        }
    }

    setDrawerLockMode(ss.lockModeTop, Gravity.TOP);
    setDrawerLockMode(ss.lockModeBottom, Gravity.BOTTOM);
}

---

From source file:com.rbware.github.androidcouchpotato.widget.GuidedActionsStylist.java

/**
 * Start transition to expand or collapse GuidedActionStylist.
 * @param avh When not null, the GuidedActionStylist expands the sub actions of avh.  When null
 * the GuidedActionStylist will collapse sub actions.
 *///from   w w  w. ja  v  a2  s. c o m
public void startExpandedTransition(ViewHolder avh) {
    ViewHolder focusAvh = null; // expand / collapse view holder
    final int count = mActionsGridView.getChildCount();
    for (int i = 0; i < count; i++) {
        ViewHolder vh = (ViewHolder) mActionsGridView.getChildViewHolder(mActionsGridView.getChildAt(i));
        if (avh == null && vh.itemView.getVisibility() == View.VISIBLE) {
            // going to collapse this one.
            focusAvh = vh;
            break;
        } else if (avh != null && vh.getAction() == avh.getAction()) {
            // going to expand this one.
            focusAvh = vh;
            break;
        }
    }
    if (focusAvh == null) {
        // huh?
        onUpdateExpandedViewHolder(avh);
        return;
    }
    boolean isSubActionTransition = focusAvh.getAction().hasSubActions();
    Object set = TransitionHelper.createTransitionSet(false);
    float slideDistance = isSubActionTransition ? focusAvh.itemView.getHeight()
            : focusAvh.itemView.getHeight() * 0.5f;
    Object slideAndFade = TransitionHelper.createFadeAndShortSlide(Gravity.TOP | Gravity.BOTTOM, slideDistance);
    Object changeFocusItemTransform = TransitionHelper.createChangeTransform();
    Object changeFocusItemBounds = TransitionHelper.createChangeBounds(false);
    Object fade = TransitionHelper.createFadeTransition(TransitionHelper.FADE_IN | TransitionHelper.FADE_OUT);
    Object changeGridBounds = TransitionHelper.createChangeBounds(false);
    if (avh == null) {
        TransitionHelper.setStartDelay(slideAndFade, 150);
        TransitionHelper.setStartDelay(changeFocusItemTransform, 100);
        TransitionHelper.setStartDelay(changeFocusItemBounds, 100);
    } else {
        TransitionHelper.setStartDelay(fade, 100);
        TransitionHelper.setStartDelay(changeGridBounds, 100);
        TransitionHelper.setStartDelay(changeFocusItemTransform, 50);
        TransitionHelper.setStartDelay(changeFocusItemBounds, 50);
    }
    for (int i = 0; i < count; i++) {
        ViewHolder vh = (ViewHolder) mActionsGridView.getChildViewHolder(mActionsGridView.getChildAt(i));
        if (vh == focusAvh) {
            // going to expand/collapse this one.
            if (isSubActionTransition) {
                TransitionHelper.include(changeFocusItemTransform, vh.itemView);
                TransitionHelper.include(changeFocusItemBounds, vh.itemView);
            }
        } else {
            // going to slide this item to top / bottom.
            TransitionHelper.include(slideAndFade, vh.itemView);
            TransitionHelper.exclude(fade, vh.itemView, true);
        }
    }
    TransitionHelper.include(changeGridBounds, mSubActionsGridView);
    TransitionHelper.include(changeGridBounds, mSubActionsBackground);
    TransitionHelper.addTransition(set, slideAndFade);
    // note that we don't run ChangeBounds for activating view due to the rounding problem
    // of multiple level views ChangeBounds animation causing vertical jittering.
    if (isSubActionTransition) {
        TransitionHelper.addTransition(set, changeFocusItemTransform);
        TransitionHelper.addTransition(set, changeFocusItemBounds);
    }
    TransitionHelper.addTransition(set, fade);
    TransitionHelper.addTransition(set, changeGridBounds);
    mExpandTransition = set;
    TransitionHelper.addTransitionListener(mExpandTransition, new TransitionListener() {
        @Override
        public void onTransitionEnd(Object transition) {
            mExpandTransition = null;
        }
    });
    if (avh != null && mSubActionsGridView.getTop() != avh.itemView.getTop()) {
        // For expanding, set the initial position of subActionsGridView before running
        // a ChangeBounds on it.
        final ViewHolder toUpdate = avh;
        mSubActionsGridView.addOnLayoutChangeListener(new View.OnLayoutChangeListener() {
            @Override
            public void onLayoutChange(View v, int left, int top, int right, int bottom, int oldLeft,
                    int oldTop, int oldRight, int oldBottom) {
                if (mSubActionsGridView == null) {
                    return;
                }
                mSubActionsGridView.removeOnLayoutChangeListener(this);
                mMainView.post(new Runnable() {
                    @Override
                    public void run() {
                        if (mMainView == null) {
                            return;
                        }
                        TransitionHelper.beginDelayedTransition(mMainView, mExpandTransition);
                        onUpdateExpandedViewHolder(toUpdate);
                    }
                });
            }
        });
        ViewGroup.MarginLayoutParams lp = (ViewGroup.MarginLayoutParams) mSubActionsGridView.getLayoutParams();
        lp.topMargin = avh.itemView.getTop();
        lp.height = 0;
        mSubActionsGridView.setLayoutParams(lp);
        return;
    }
    TransitionHelper.beginDelayedTransition(mMainView, mExpandTransition);
    onUpdateExpandedViewHolder(avh);
}

---

From source file:android.support.design.widget.CoordinatorLayout.java

/**
 * Return the given gravity value, but if either or both of the axes doesn't have any gravity
 * specified, the default value (start or top) is specified. This should be used for children
 * that are not anchored to another view or a keyline.
 *//* w  w w .  ja va  2  s . c  o  m*/
private static int resolveGravity(int gravity) {
    if ((gravity & Gravity.HORIZONTAL_GRAVITY_MASK) == Gravity.NO_GRAVITY) {
        gravity |= GravityCompat.START;
    }
    if ((gravity & Gravity.VERTICAL_GRAVITY_MASK) == Gravity.NO_GRAVITY) {
        gravity |= Gravity.TOP;
    }
    return gravity;
}

---

From source file:com.jackie.sample.custom_view.CustomViewPagerInternal.java

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    // For simple implementation, or internal size is always 0.
    // We depend on the container to specify the layout size of
    // our view. We can't really know what it is since we will be
    // adding and removing different arbitrary views and do not
    // want the layout to change as this happens.
    setMeasuredDimension(getDefaultSize(0, widthMeasureSpec), getDefaultSize(0, heightMeasureSpec));

    final int measuredWidth = getMeasuredWidth();
    final int maxGutterSize = measuredWidth / 10;
    mGutterSize = Math.min(maxGutterSize, mDefaultGutterSize);

    // ChildrenBean are just made to fill our space.
    int childWidthSize = measuredWidth - getPaddingLeft() - getPaddingRight();
    int childHeightSize = getMeasuredHeight() - getPaddingTop() - getPaddingBottom();

    /*//from ww  w  .  java2s .  c  om
     * Make sure all children have been properly measured. Decor views first.
     * Right now we cheat and make this less complicated by assuming decor
     * views won't intersect. We will pin to edges based on gravity.
     */
    int size = getChildCount();
    for (int i = 0; i < size; ++i) {
        final View child = getChildAt(i);
        if (child.getVisibility() != GONE) {
            final LayoutParams lp = (LayoutParams) child.getLayoutParams();
            if (lp != null && lp.isDecor) {
                final int hgrav = lp.gravity & Gravity.HORIZONTAL_GRAVITY_MASK;
                final int vgrav = lp.gravity & Gravity.VERTICAL_GRAVITY_MASK;
                int widthMode = MeasureSpec.AT_MOST;
                int heightMode = MeasureSpec.AT_MOST;
                boolean consumeVertical = vgrav == Gravity.TOP || vgrav == Gravity.BOTTOM;
                boolean consumeHorizontal = hgrav == Gravity.LEFT || hgrav == Gravity.RIGHT;

                if (consumeVertical) {
                    widthMode = MeasureSpec.EXACTLY;
                } else if (consumeHorizontal) {
                    heightMode = MeasureSpec.EXACTLY;
                }

                int widthSize = childWidthSize;
                int heightSize = childHeightSize;
                if (lp.width != LayoutParams.WRAP_CONTENT) {
                    widthMode = MeasureSpec.EXACTLY;
                    if (lp.width != LayoutParams.FILL_PARENT) {
                        widthSize = lp.width;
                    }
                }
                if (lp.height != LayoutParams.WRAP_CONTENT) {
                    heightMode = MeasureSpec.EXACTLY;
                    if (lp.height != LayoutParams.FILL_PARENT) {
                        heightSize = lp.height;
                    }
                }
                final int widthSpec = MeasureSpec.makeMeasureSpec(widthSize, widthMode);
                final int heightSpec = MeasureSpec.makeMeasureSpec(heightSize, heightMode);
                child.measure(widthSpec, heightSpec);

                if (consumeVertical) {
                    childHeightSize -= child.getMeasuredHeight();
                } else if (consumeHorizontal) {
                    childWidthSize -= child.getMeasuredWidth();
                }
            }
        }
    }

    mChildWidthMeasureSpec = MeasureSpec.makeMeasureSpec(childWidthSize, MeasureSpec.EXACTLY);
    mChildHeightMeasureSpec = MeasureSpec.makeMeasureSpec(childHeightSize, MeasureSpec.EXACTLY);

    // Make sure we have created all fragments that we need to have shown.
    mInLayout = true;
    populate();
    mInLayout = false;

    // Page views next.
    size = getChildCount();
    for (int i = 0; i < size; ++i) {
        final View child = getChildAt(i);
        if (child.getVisibility() != GONE) {
            if (DEBUG)
                Log.v(TAG, "Measuring #" + i + " " + child + ": " + mChildWidthMeasureSpec);

            final LayoutParams lp = (LayoutParams) child.getLayoutParams();
            if (lp == null || !lp.isDecor) {
                final int widthSpec = MeasureSpec.makeMeasureSpec((int) (childWidthSize * lp.widthFactor),
                        MeasureSpec.EXACTLY);
                child.measure(widthSpec, mChildHeightMeasureSpec);
            }
        }
    }
}

---

From source file:android.support.design.widget.CoordinatorLayout.java

/**
 * Return the given gravity value or the default if the passed value is NO_GRAVITY.
 * This should be used for children that are positioned relative to a keyline.
 *//*from w w  w.j a  v  a 2 s. c o  m*/
private static int resolveKeylineGravity(int gravity) {
    return gravity == Gravity.NO_GRAVITY ? GravityCompat.END | Gravity.TOP : gravity;
}

---

From source file:administrator.example.com.myscrollview.VerticalViewPager.java

@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
    mInLayout = true;/*from   w  w  w  .j  a  v  a2 s.c o m*/
    populate();
    mInLayout = false;

    final int count = getChildCount();
    int width = r - l;
    int height = b - t;
    int paddingLeft = getPaddingLeft();
    int paddingTop = getPaddingTop();
    int paddingRight = getPaddingRight();
    int paddingBottom = getPaddingBottom();
    final int scrollY = getScrollY();

    int decorCount = 0;

    for (int i = 0; i < count; i++) {
        final View child = getChildAt(i);
        if (child.getVisibility() != GONE) {
            final LayoutParams lp = (LayoutParams) child.getLayoutParams();
            ItemInfo ii;
            int childLeft = 0;
            int childTop = 0;
            if (lp.isDecor) {
                //XXX isDecorfalse
                final int hgrav = lp.gravity & Gravity.HORIZONTAL_GRAVITY_MASK;
                final int vgrav = lp.gravity & Gravity.VERTICAL_GRAVITY_MASK;
                switch (hgrav) {
                default:
                    childLeft = paddingLeft;
                    break;
                case Gravity.LEFT:
                    childLeft = paddingLeft;
                    paddingLeft += child.getMeasuredWidth();
                    break;
                case Gravity.CENTER_HORIZONTAL:
                    childLeft = Math.max((width - child.getMeasuredWidth()) / 2, paddingLeft);
                    break;
                case Gravity.RIGHT:
                    childLeft = width - paddingRight - child.getMeasuredWidth();
                    paddingRight += child.getMeasuredWidth();
                    break;
                } /* end of switch */
                switch (vgrav) {
                default:
                    childTop = paddingTop;
                    break;
                case Gravity.TOP:
                    childTop = paddingTop;
                    paddingTop += child.getMeasuredHeight();
                    break;
                case Gravity.CENTER_VERTICAL:
                    childTop = Math.max((height - child.getMeasuredHeight()) / 2, paddingTop);
                    break;
                case Gravity.BOTTOM:
                    childTop = height - paddingBottom - child.getMeasuredHeight();
                    paddingBottom += child.getMeasuredHeight();
                    break;
                } /* end of switch */

                //XXX y?
                childTop += scrollY;
                decorCount++;
                child.layout(childLeft, childTop, childLeft + child.getMeasuredWidth(),
                        childTop + child.getMeasuredHeight());
            } else if ((ii = infoForChild(child)) != null) {
                //XXX ViewPager??
                int toff = (height + mPageMargin) * ii.position;
                childLeft = paddingLeft;
                childTop = paddingTop + toff;

                if (DEBUG)
                    Log.v(TAG, "Positioning #" + i + " " + child + " f=" + ii.object + ":" + childLeft + ","
                            + childTop + " " + child.getMeasuredWidth() + "x" + child.getMeasuredHeight());
                child.layout(childLeft, childTop, childLeft + child.getMeasuredWidth(),
                        childTop + child.getMeasuredHeight());
            } /* end of if */
        } /* end of if */
    } /* end of for */

    //XXX ?
    mLeftPageBounds = paddingLeft;
    mRightPageBounds = width - paddingRight;
    mDecorChildCount = decorCount;
    mFirstLayout = false;
}

---

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