Example usage for android.support.v4.view ViewCompat canScrollVertically

Introduction

In this page you can find the example usage for android.support.v4.view ViewCompat canScrollVertically.

Prototype

public static boolean canScrollVertically(View v, int direction) 

Source Link

Document

Check if this view can be scrolled vertically in a certain direction.

Usage

From source file:com.hardsoftstudio.anchorbottomsheet.AnchorSheetBehavior.java

/**
 * Sets the state of the bottom sheet. The bottom sheet will transition to that state with
 * animation./*from  w  w  w  .j  a  v a 2 s .  c o m*/
 *
 * @param state One of {@link #STATE_COLLAPSED}, {@link #STATE_EXPANDED}, or
 *              {@link #STATE_HIDDEN}.
 */
public final void setState(@State int state) {
    if (state == mState) {
        return;
    }
    if (mViewRef == null) {
        // The view is not laid out yet; modify mState and let onLayoutChild handle it later
        if (state == STATE_COLLAPSED || state == STATE_EXPANDED || state == STATE_ANCHOR
                || (mHideable && state == STATE_HIDDEN)) {
            mState = state;
        }
        return;
    }
    V child = mViewRef.get();
    if (child == null) {
        return;
    }
    int top;
    if (state == STATE_COLLAPSED) {
        top = mMaxOffset;
        View scroll = mNestedScrollingChildRef.get();
        if (scroll != null && ViewCompat.canScrollVertically(scroll, -1)) {
            scroll.scrollTo(0, 0);
        }
    } else if (state == STATE_EXPANDED) {
        top = mMinOffset;
    } else if (state == STATE_ANCHOR) {
        top = mAnchorOffset;
    } else if (mHideable && state == STATE_HIDDEN) {
        top = mParentHeight;
    } else {
        throw new IllegalArgumentException("Illegal state argument: " + state);
    }
    setStateInternal(STATE_SETTLING);
    if (mViewDragHelper.smoothSlideViewTo(child, child.getLeft(), top)) {
        ViewCompat.postOnAnimation(child, new SettleRunnable(child, state));
    }
}

---

From source file:com.hxqc.mall.core.views.CustomScrollView.java

@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
    /*//from   www.java2 s  .co  m
     * This method JUST determines whether we want to intercept the motion.
     * If we return true, onMotionEvent will be called and we do the actual
     * scrolling there.
     */

    /*
    * Shortcut the most recurring case: the user is in the dragging
    * state and he is moving his finger.  We want to intercept this
    * motion.
    */
    final int action = ev.getAction();
    if ((action == MotionEvent.ACTION_MOVE) && (mIsBeingDragged)) {
        DebugLog.d("CustomScrollView", "one" + ev.getX());
        return true;
    }

    /*
     * Don't try to intercept touch if we can't scroll anyway.
     */
    if (getScrollY() == 0 && !ViewCompat.canScrollVertically(this, 1)) {
        DebugLog.d("CustomScrollView", "two" + ev.getX());
        return false;
    }

    switch (action & MotionEventCompat.ACTION_MASK) {
    case MotionEvent.ACTION_MOVE: {
        DebugLog.d("CustomScrollView", mIsBeingDragged + "ACTION_MOVE" + ev.getX());

        /*
         * mIsBeingDragged == false, otherwise the shortcut would have caught it. Check
         * whether the user has moved far enough from his original down touch.
         */

        /*
        * Locally do absolute value. mLastMotionY is set to the y value
        * of the down event.
        */
        final int activePointerId = mActivePointerId;
        if (activePointerId == INVALID_POINTER) {
            // If we don't have a valid id, the touch down wasn't on content.
            break;
        }

        final int pointerIndex = MotionEventCompat.findPointerIndex(ev, activePointerId);
        if (pointerIndex == -1) {
            DebugLog.e(TAG, "Invalid pointerId=" + activePointerId + " in onInterceptTouchEvent");
            break;
        }

        final int y = (int) MotionEventCompat.getY(ev, pointerIndex);
        final int yDiff = Math.abs(y - mLastMotionY);
        if (yDiff > mTouchSlop && (getNestedScrollAxes() & ViewCompat.SCROLL_AXIS_VERTICAL) == 0) {
            mIsBeingDragged = true;
            mLastMotionY = y;
            initVelocityTrackerIfNotExists();
            mVelocityTracker.addMovement(ev);
            mNestedYOffset = 0;
            final ViewParent parent = getParent();
            if (parent != null) {
                parent.requestDisallowInterceptTouchEvent(true);
            }
        }
        break;
    }

    case MotionEvent.ACTION_DOWN: {
        DebugLog.d("CustomScrollView", mIsBeingDragged + "ACTION_DOWN" + ev.getX());
        mDownX = ev.getX();
        final int y = (int) ev.getY();
        if (!inChild((int) ev.getX(), y)) {
            mIsBeingDragged = false;
            recycleVelocityTracker();
            break;
        }

        /*
         * Remember location of down touch.
         * ACTION_DOWN always refers to pointer index 0.
         */
        mLastMotionY = y;
        mActivePointerId = MotionEventCompat.getPointerId(ev, 0);

        initOrResetVelocityTracker();
        mVelocityTracker.addMovement(ev);
        /*
        * If being flinged and user touches the screen, initiate drag;
        * otherwise don't.  mScroller.isFinished should be false when
        * being flinged.
        */
        //                mIsBeingDragged = !mScroller.isFinished();
        startNestedScroll(ViewCompat.SCROLL_AXIS_VERTICAL);
        break;
    }

    case MotionEvent.ACTION_CANCEL:
    case MotionEvent.ACTION_UP:
        moveX = ev.getX() - mDownX;
        DebugLog.d("CustomScrollView", mIsBeingDragged + "ACTION_UP" + ev.getX());
        /* Release the drag */
        mIsBeingDragged = false;
        mActivePointerId = INVALID_POINTER;
        recycleVelocityTracker();
        stopNestedScroll();
        break;
    case MotionEventCompat.ACTION_POINTER_UP:
        DebugLog.d("CustomScrollView", mIsBeingDragged + "ACTION_POINTER_UP" + ev.getX());
        onSecondaryPointerUp(ev);
        break;
    }

    if (Math.abs(moveX) < 10 && ev.getAction() == MotionEvent.ACTION_UP) {
        DebugLog.d("CustomScrollView", "ON" + "\nmoveX" + moveX + "\nmD" + mDownX);
        moveX = 0.1f;
        return false;
    }

    DebugLog.d("CustomScrollView", mIsBeingDragged + "");
    /*
    * The only time we want to intercept motion events is if we are in the
    * drag mode.
    */
    return mIsBeingDragged;
}

---

From source file:com.hxqc.mall.thirdshop.views.CustomScrollView.java

@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
    /*//  w w w .  ja  va2s  . c  o  m
     * This method JUST determines whether we want to intercept the motion.
     * If we return true, onMotionEvent will be called and we do the actual
     * scrolling there.
     */

    /*
    * Shortcut the most recurring case: the user is in the dragging
    * state and he is moving his finger.  We want to intercept this
    * motion.
    */
    final int action = ev.getAction();
    if ((action == MotionEvent.ACTION_MOVE) && (mIsBeingDragged)) {
        DebugLog.d("CustomScrollView", "one" + ev.getX());
        return true;
    }

    /*
     * Don't try to intercept touch if we can't scroll anyway.
     */
    if (getScrollY() == 0 && !ViewCompat.canScrollVertically(this, 1)) {
        DebugLog.d("CustomScrollView", "two" + ev.getX());
        return false;
    }

    switch (action & MotionEventCompat.ACTION_MASK) {
    case MotionEvent.ACTION_MOVE: {
        DebugLog.d("CustomScrollView", mIsBeingDragged + "ACTION_MOVE" + ev.getX());

        /*
         * mIsBeingDragged == false, otherwise the shortcut would have caught it. Check
         * whether the user has moved far enough from his original down touch.
         */

        /*
        * Locally do absolute value. mLastMotionY is set to the y value
        * of the down event.
        */
        final int activePointerId = mActivePointerId;
        if (activePointerId == INVALID_POINTER) {
            // If we don't have a valid id, the touch down wasn't on content.
            break;
        }

        final int pointerIndex = MotionEventCompat.findPointerIndex(ev, activePointerId);
        if (pointerIndex == -1) {
            DebugLog.e(TAG, "Invalid pointerId=" + activePointerId + " in onInterceptTouchEvent");
            break;
        }

        final int y = (int) MotionEventCompat.getY(ev, pointerIndex);
        final int yDiff = Math.abs(y - mLastMotionY);
        if (yDiff > mTouchSlop && (getNestedScrollAxes() & ViewCompat.SCROLL_AXIS_VERTICAL) == 0) {
            mIsBeingDragged = true;
            mLastMotionY = y;
            initVelocityTrackerIfNotExists();
            mVelocityTracker.addMovement(ev);
            mNestedYOffset = 0;
            final ViewParent parent = getParent();
            if (parent != null) {
                parent.requestDisallowInterceptTouchEvent(true);
            }
        }
        break;
    }

    case MotionEvent.ACTION_DOWN: {
        DebugLog.d("CustomScrollView", mIsBeingDragged + "ACTION_DOWN" + ev.getX());
        mDownX = ev.getX();
        final int y = (int) ev.getY();
        if (!inChild((int) ev.getX(), y)) {
            mIsBeingDragged = false;
            recycleVelocityTracker();
            break;
        }

        /*
         * Remember location of down touch.
         * ACTION_DOWN always refers to pointer index 0.
         */
        mLastMotionY = y;
        mActivePointerId = MotionEventCompat.getPointerId(ev, 0);

        initOrResetVelocityTracker();
        mVelocityTracker.addMovement(ev);
        /*
        * If being flinged and user touches the screen, initiate drag;
        * otherwise don't.  mScroller.isFinished should be false when
        * being flinged.
        */
        //                mIsBeingDragged = !mScroller.isFinished();
        startNestedScroll(ViewCompat.SCROLL_AXIS_VERTICAL);
        break;
    }

    case MotionEvent.ACTION_CANCEL:
    case MotionEvent.ACTION_UP:
        moveX = ev.getX() - mDownX;
        DebugLog.d("CustomScrollView", mIsBeingDragged + "ACTION_UP" + ev.getX());
        /* Release the drag */
        mIsBeingDragged = false;
        mActivePointerId = INVALID_POINTER;
        recycleVelocityTracker();
        stopNestedScroll();
        break;
    case MotionEventCompat.ACTION_POINTER_UP:
        DebugLog.d("CustomScrollView", mIsBeingDragged + "ACTION_POINTER_UP" + ev.getX());
        onSecondaryPointerUp(ev);
        break;
    default:
        break;
    }

    if (Math.abs(moveX) < 10 && ev.getAction() == MotionEvent.ACTION_UP) {
        DebugLog.d("CustomScrollView", "ON" + "\nmoveX" + moveX + "\nmD" + mDownX);
        moveX = 0.1f;
        return false;
    }

    DebugLog.d("CustomScrollView", mIsBeingDragged + "");
    /*
    * The only time we want to intercept motion events is if we are in the
    * drag mode.
    */
    return mIsBeingDragged;
}

---

From source file:com.nxt.zyl.ui.widget.pulltorefresh.SwipeRefreshLayout.java

public boolean canChildScrollDown() {
    if (android.os.Build.VERSION.SDK_INT < 14) {
        if (mTarget instanceof AbsListView) {
            final AbsListView absListView = (AbsListView) mTarget;
            View lastChild = absListView.getChildAt(absListView.getChildCount() - 1);
            return lastChild != null && (absListView.getLastVisiblePosition() == (absListView.getCount() - 1))
                    && lastChild.getBottom() > absListView.getPaddingBottom();
        } else {/*from w  ww  .j a v  a  2 s. c  o m*/
            return mTarget.getHeight() - mTarget.getScrollY() > 0;
        }
    } else {
        return ViewCompat.canScrollVertically(mTarget, 1);
    }
}

---

From source file:com.cdwx.moka.widget.SwipeRefreshLayout.java

public boolean canChildScrollDown() {
    if (android.os.Build.VERSION.SDK_INT < 14) {
        if (mTarget instanceof AbsListView) {
            final AbsListView absListView = (AbsListView) mTarget;
            View lastChild = absListView.getChildAt(absListView.getChildCount() - 1);
            if (lastChild != null) {
                return (absListView.getLastVisiblePosition() == (absListView.getCount() - 1))
                        && lastChild.getBottom() > absListView.getPaddingBottom();
            } else {
                return false;
            }/*from ww  w  .  j av a  2s.  co  m*/
        } else {
            return mTarget.getHeight() - mTarget.getScrollY() > 0;
        }
    } else {
        return ViewCompat.canScrollVertically(mTarget, 1);
    }
}

---

From source file:com.hynet.mergepay.components.widget.panellayout.ViewDragHelper.java

protected boolean canScroll(View v, boolean checkV, int dx, int dy, int x, int y) {
    if (v instanceof ViewGroup) {
        final ViewGroup group = (ViewGroup) v;
        final int scrollX = v.getScrollX();
        final int scrollY = v.getScrollY();
        final int count = group.getChildCount();
        // Count backwards - let topmost views consume scroll distance first.
        for (int i = count - 1; i >= 0; i--) {
            // TODO: Add versioned support here for transformed views.
            // This will not work for transformed views in Honeycomb+
            final View child = group.getChildAt(i);
            if (x + scrollX >= child.getLeft() && x + scrollX < child.getRight()
                    && y + scrollY >= child.getTop() && y + scrollY < child.getBottom() && canScroll(child,
                            true, dx, dy, x + scrollX - child.getLeft(), y + scrollY - child.getTop())) {
                return true;
            }/*w w w.ja  v a 2  s.c o m*/
        }
    }

    return checkV && (ViewCompat.canScrollHorizontally(v, -dx) || ViewCompat.canScrollVertically(v, -dy));
}

---

From source file:chinanurse.cn.nurse.list.WaveSwipeRefreshLayout.java

/**
 * @return ScrollUp?????/*from  ww  w.  ja  v  a  2s.c  om*/
 */
public boolean canChildScrollUp() {
    if (mTarget == null) {
        return false;
    }

    if (android.os.Build.VERSION.SDK_INT < 14) {
        if (mTarget instanceof AbsListView) {
            final AbsListView absListView = (AbsListView) mTarget;
            return absListView.getChildCount() > 0 && (absListView.getFirstVisiblePosition() > 0
                    || absListView.getChildAt(0).getTop() < absListView.getPaddingTop());
        } else {
            return mTarget.getScrollY() > 0;
        }
    } else {
        return ViewCompat.canScrollVertically(mTarget, -1);
    }
}

---

From source file:com.telerik.examples.primitives.ExampleViewPagerBase.java

private boolean getCanScroll(View v, int dx) {

    if (this.orientation == LinearLayout.HORIZONTAL) {
        return ViewCompat.canScrollHorizontally(v, -dx);
    }/*w w w.j  a  va 2  s.  c om*/

    return ViewCompat.canScrollVertically(v, -dx);
}

---

From source file:com.telerik.examples.primitives.ExampleViewPagerBase.java

private boolean getInvertedCanScroll(View v, int dx) {

    if (this.orientation == LinearLayout.VERTICAL) {
        return ViewCompat.canScrollHorizontally(v, -dx);
    }/*from  w  w w .  ja  v  a2  s .  c o  m*/

    return ViewCompat.canScrollVertically(v, -dx);
}

---

From source file:com.limxing.library.PullToRefresh.SwipeRefreshLayout.java

/**
 * @return Whether it is possible for the child view of this layout to
 *         scroll down. Override this if the child view is a custom view.
 *//*from   w  w  w.  ja  v a2  s .  c o  m*/
public boolean canChildScrollDown() {
    if (android.os.Build.VERSION.SDK_INT < 14) {
        if (mTarget instanceof AbsListView) {
            final AbsListView absListView = (AbsListView) mTarget;
            View lastChild = absListView.getChildAt(absListView.getChildCount() - 1);

            if (lastChild != null) {
                if ((absListView.getLastVisiblePosition() == (absListView.getCount() - 1))
                        && lastChild.getBottom() >= absListView.getPaddingBottom()) {
                    return false;
                }
                return true;
            } else {
                return false;
            }
        } else {
            return mTarget.getHeight() - mTarget.getScrollY() > 0;
        }
    } else {
        return ViewCompat.canScrollVertically(mTarget, 1);
    }
}

---

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