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.apptentive.android.sdk.module.engagement.interaction.fragment.MessageCenterFragment.java

@Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
    boolean bCanScrollUp;
    if (android.os.Build.VERSION.SDK_INT < 14) {
        bCanScrollUp = view.getChildCount() > 0
                && (view.getFirstVisiblePosition() > 0 || view.getChildAt(0).getTop() < view.getPaddingTop());
    } else {/*  w ww  .  j a  v  a 2 s .c  o m*/
        bCanScrollUp = ViewCompat.canScrollVertically(view, -1);
    }
    showToolbarElevation(bCanScrollUp);
}

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From source file:com.apptentive.android.sdk.module.messagecenter.view.MessageCenterActivityContent.java

@Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
    boolean bCanScrollUp;
    if (android.os.Build.VERSION.SDK_INT < 14) {
        bCanScrollUp = view.getChildCount() > 0
                && (view.getFirstVisiblePosition() > 0 || view.getChildAt(0).getTop() < view.getPaddingTop());
    } else {/*from  w w  w  .  j  a v a 2 s  .  c  om*/
        bCanScrollUp = ViewCompat.canScrollVertically(view, -1);
    }
    if (bCanScrollUp) {
        if (android.os.Build.VERSION.SDK_INT > 20) {
            messageCenterHeader.setElevation(8);
        } else {
            headerDivider.setVisibility(View.VISIBLE);
        }
    } else {
        if (android.os.Build.VERSION.SDK_INT > 20) {
            messageCenterHeader.setElevation(0);
        } else {
            headerDivider.setVisibility(View.GONE);
        }
    }
}

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From source file:com.example.mvpdemo.widget.NarrowParentViewPager.java

@Override
public void onNestedPreScroll(View target, int dx, int dy, int[] consumed) {
    Log.i(TAG, "onNestedPreScroll    dx = " + dx + "    dy = " + dy + "     consumed = " + consumed[0] + ","
            + consumed[1]);//from  w w w  . ja  v a 2 s .c  om
    int scrollY = target.getScrollY();
    Log.i(TAG, "scrollY = " + scrollY);
    if (Math.abs(dy) > Math.abs(dx)) {
        if (dy < 0 && !ViewCompat.canScrollVertically(target, -1)) {
            childScrollUp(mDragDistance + dy);
        } else if (dy > 0) {
            boolean b = childScrollUp(mDragDistance + dy);
            if (b) {
                consumed[1] = dy;
            }
        }
    }
    super.onNestedPreScroll(target, dx, dy, consumed);
}

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From source file:com.harry.refresh.SwipyRefreshLayout.java

/**
     * @return Whether it is possible for the child view of this layout to
     * scroll up. Override this if the child view is a custom view.
     *//* w w w.  j a  v  a2 s . com*/
    public boolean canChildScrollUp() {
        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.harry.refresh.SwipyRefreshLayout.java

public boolean canChildScrollDown() {
        if (android.os.Build.VERSION.SDK_INT < 14) {
            if (mTarget instanceof AbsListView) {
                final AbsListView absListView = (AbsListView) mTarget;
                try {
                    if (absListView.getCount() > 0) {
                        if (absListView.getLastVisiblePosition() + 1 == absListView.getCount()) {
                            int lastIndex = absListView.getLastVisiblePosition()
                                    - absListView.getFirstVisiblePosition();
                            return absListView.getChildAt(lastIndex).getBottom() == absListView.getPaddingBottom();
                        }//from  w  w w .  j a v  a2 s .c om
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }
                return true;
            } else {
                return true;
            }
        } else {
            return ViewCompat.canScrollVertically(mTarget, 1);
        }
    }

---

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

/**
 * Tests scrollability within child views of v given a delta of dy.
 *
 * @param v View to test for vertical scrollability
 * @param checkV Whether the view v passed should itself be checked for scrollability (true),
 *               or just its children (false).
 * @param dy Delta scrolled in pixels//from   ww w .  j ava  2s.com
 * @param x X coordinate of the active touch point
 * @param y Y coordinate of the active touch point
 * @return true if child views of v can be scrolled by delta of dx.
 */
protected boolean canScroll(View v, boolean checkV, 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, dy, x + scrollX - child.getLeft(), y + scrollY - child.getTop())) {
                return true;
            } /* end of if */
        } /* end of for */
    } /* end of if */

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

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From source file:com.example.view.VerticalViewPager.java

/**
 * Tests scrollability within child views of v given a delta of dy.
 * //from www.j  a  v  a 2s.  com
 * @param v
 *            View to test for vertical scrollability
 * @param checkV
 *            Whether the view v passed should itself be checked for
 *            scrollability (true), or just its children (false).
 * @param dy
 *            Delta scrolled in pixels
 * @param x
 *            X coordinate of the active touch point
 * @param y
 *            Y coordinate of the active touch point
 * @return true if child views of v can be scrolled by delta of dx.
 */
protected boolean canScroll(View v, boolean checkV, 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, dy, x + scrollX - child.getLeft(), y + scrollY - child.getTop())) {
                return true;
            } /* end of if */
        } /* end of for */
    } /* end of if */

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

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From source file:javalibrary.android.ui.VerticalViewPager.java

protected boolean canScrolls(View v, boolean checkV, 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() && canScrolls(child,
                            true, dy, x + scrollX - child.getLeft(), y + scrollY - child.getTop())) {
                return true;
            }//from www .jav  a  2  s .c o m
        }
    }

    return checkV && ViewCompat.canScrollVertically(v, -dy);

    //        return checkV && ViewCompat.canScrollHorizontally(v, -dx);
}

---

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

/**
 * Tests scrollability within child views of v given a delta of dx.
 * //from w w  w .j ava2  s.  com
 * @param v
 *            View to test for horizontal scrollability
 * @param checkV
 *            Whether the view v passed should itself be checked for scrollability (true), or just its children
 *            (false).
 * @param dx
 *            Delta scrolled in pixels
 * @param x
 *            X coordinate of the active touch point
 * @param y
 *            Y coordinate of the active touch point
 * @return true if child views of v can be scrolled by delta of dx.
 */
protected boolean canScroll(View v, boolean checkV, 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, dy, x + scrollX - child.getLeft(), y + scrollY - child.getTop())) {
                return true;
            }
        }
    }

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

---

From source file:com.jstudio.widget.pager.VerticalViewPager.java

/**
 * Tests scrollability within child views of v given a delta of dx.
 *
 * @param v View to test for horizontal scrollability
 * @param checkV Whether the view v passed should itself be checked for scrollability (true),
 *               or just its children (false).
 * @param dy Delta scrolled in pixels//w w  w  . j a va  2s  .  co m
 * @param x X coordinate of the active touch point
 * @param y Y coordinate of the active touch point
 * @return true if child views of v can be scrolled by delta of dx.
 */
protected boolean canScroll(View v, boolean checkV, 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--) {
            // 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, dy, x + scrollX - child.getLeft(), y + scrollY - child.getTop())) {
                return true;
            }
        }
    }

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

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