Java Code Examples for android.view.View#getScrollY()

/**
 * 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 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 dx, 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, x + scrollX - child.getLeft(),
                            y + scrollY - child.getTop())) {
                return true;
            }
        }
    }

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

/**
 * 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 dx Delta scrolled in pixels along the X axis
 * @param dy Delta scrolled in pixels along the Y axis
 * @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 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;
            }
        }
    }

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

/**
 * 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 dx Delta scrolled in pixels along the X axis
 * @param dy Delta scrolled in pixels along the Y axis
 * @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 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;
            }
        }
    }

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

/**
 * 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 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 dx, 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--) {
            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, x + scrollX - child.getLeft(),
                            y + scrollY - child.getTop())) {
                return true;
            }
        }
    }
    return checkV && v.canScrollHorizontally(-dx);
}
 

/**
 * 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 dx Delta scrolled in pixels along the X axis
 * @param dy Delta scrolled in pixels along the Y axis
 * @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 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;
            }
        }
    }

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

private boolean canScrollLeft(View view, float x, float y) {
    if (view instanceof ViewGroup) {
        ViewGroup vg = (ViewGroup) view;
        for (int i = 0; i < vg.getChildCount(); i++) {
            View child = vg.getChildAt(i);
            int childLeft = child.getLeft() - view.getScrollX();
            int childTop = child.getTop() - view.getScrollY();
            int childRight = child.getRight() - view.getScrollX();
            int childBottom = child.getBottom() - view.getScrollY();
            boolean intersects = x > childLeft && x < childRight && y > childTop && y < childBottom;
            if (intersects && canScrollLeft(child, x - childLeft, y - childTop)) {
                return true;
            }
        }
    }
    return view.canScrollHorizontally(-1);
}
 

/**
 * 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 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 dx, 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--) {
            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, x + scrollX - child.getLeft(),
                            y + scrollY - child.getTop())) {
                return true;
            }
        }
    }
    return checkV && ViewCompat.canScrollHorizontally(v, -dx);
}
 

/**
 * 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 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 dx, 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--) {
			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, x + scrollX - child.getLeft(),
							y + scrollY - child.getTop())) {
				return true;
			}
		}
	}

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

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;
                }
            }
        }

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

private void calculateDistance(View view, int scrollY, int oldScrollY) {
    if (mAppBarScrollRange == null || mNestedScrollRange == null) {
        return;
    }

    int totalScrollRange = mAppBarScrollRange + mNestedScrollRange;

    if (view instanceof AppBarLayout) {
        mAppBarScrollPosition = Math.abs(-scrollY);
    } else if (view instanceof NestedScrollView) {
        mNestedScrollPosition = view.getScrollY();
    }

    int scrollPosition = mAppBarScrollPosition + mNestedScrollPosition;
    mScrollPositionMultiplier = (double) (scrollPosition / totalScrollRange);
    if (mOnTotalScrollChangeListener != null) {
        mOnTotalScrollChangeListener.onTotalScrollChanged(view, scrollPosition, mOldScrollPosition, totalScrollRange);
    }
    mOldScrollPosition = scrollPosition;
}
 

public int getScrollY() {
    View view = mView.get();
    if (view == null) {
        return 0;
    }
    return view.getScrollY();
}
 

public int getScrollY() {
    View view = mView.get();
    if (view == null) {
        return 0;
    }
    return view.getScrollY();
}
 

/**
 * 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 dx     Delta scrolled in pixels along the X axis
 * @param dy     Delta scrolled in pixels along the Y axis
 * @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 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;
            }
        }
    }

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

/**
 * child can scroll
 * @param view
 * @param event
 * @param x
 * @param y
 * @param lockRect 是否开启 touch 所动在当前 view 区域
 * @return
 */
protected boolean canScrollDown(View view, MotionEvent event, float x, float y, boolean lockRect) {
    if (view instanceof WebView) {
        return canWebViewScrollDown((WebView) view);
    }
    if (view instanceof ViewGroup) {
        ViewGroup vg = (ViewGroup) view;
        for (int i = 0; i < vg.getChildCount(); i++) {
            View child = vg.getChildAt(i);
            int childLeft = child.getLeft() - view.getScrollX();
            int childTop = child.getTop() - view.getScrollY();
            int childRight = child.getRight() - view.getScrollX();
            int childBottom = child.getBottom() - view.getScrollY();
            boolean intersects = x > childLeft && x < childRight && y > childTop && y < childBottom;
            if ((!lockRect || intersects)
                    && canScrollDown(child, event, x - childLeft, y - childTop, lockRect)) {
                return true;
            }
        }
    }

    if (view instanceof CoordinatorLayout &&
            ((CoordinatorLayout) view).getChildCount() > 0 &&
            ((CoordinatorLayout) view).getChildAt(0) instanceof AppBarLayout) {
        AppBarLayout layout = (AppBarLayout) ((CoordinatorLayout) view).getChildAt(0);
        OnNestOffsetChangedListener listener = mOnOffsetChangedListener.get(layout.hashCode());
        if (listener != null) {
            if (listener.getOffsetY() < layout.getMeasuredHeight() && listener.getOffsetY() > 0) {
                return true;
            }
        }
    }

    return isTouchUnderChildView(view, event) && view.canScrollVertically(1);
}
 

/**
 * Whether it is possible for the child view of this layout to scroll down. Override this if the child view is a custom view.
 * 判断是否可以上拉
 */
public static boolean canChildScrollDown(View mChildView) {
    if (Build.VERSION.SDK_INT < 14) {
        if (mChildView instanceof AbsListView) {
            final AbsListView absListView = (AbsListView) mChildView;
            return absListView.getChildCount() > 0
                    && (absListView.getLastVisiblePosition() < absListView.getChildCount() - 1
                    || absListView.getChildAt(absListView.getChildCount() - 1).getBottom() > absListView.getPaddingBottom());
        } else {
            return ViewCompat.canScrollVertically(mChildView, 1) || mChildView.getScrollY() < 0;
        }
    } else {
        return ViewCompat.canScrollVertically(mChildView, 1);
    }
}
 

public int getScrollY() {
    View view = mView.get();
    if (view == null) {
        return 0;
    }
    return view.getScrollY();
}
 

@Override public boolean isWidgetFullyVisible(View container) {
  int relativeTop = ViewUtil.getRelativeTop(mSeekBar, container);
  return (container.getScrollY() < relativeTop - mPopupView.getHeight() - mPopupOffset) // top edge
      && (container.getHeight() + container.getScrollY() - mPopupView.getHeight() - mPopupOffset
      > relativeTop - mSeekBar.getHeight()); // bottom edge
}
 

@Override
public boolean isReadyForPull(View view, float x, float y) {
    return view.getScrollY() <= 0;
}
 

@Override
public boolean isReadyForPull(View view, float x, float y) {
    return view.getScrollY() <= 0;
}
 

@Override
public Float get(View object) {
    return (float) object.getScrollY();
}