Java Code Examples for android.support.v7.widget.RecyclerView#scrollBy()
The following examples show how to use
android.support.v7.widget.RecyclerView#scrollBy() .
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Example 1
| Source File: ItemDragHelper.java From MultiItem with Apache License 2.0 | 6 votes |
|
/**
* 当用户滚动到边缘的时候,计算是否需要滚动
*/
private boolean scrollIfNecessary(RecyclerView recyclerView, int curX, int curY) {
if (!isDrag) {
return false;
}
RecyclerView.LayoutManager lm = recyclerView.getLayoutManager();
int scrollX = 0;
int scrollY = 0;
if (lm.canScrollHorizontally()) {
scrollX = dragListener.calcHorizontalScrollDistance(recyclerView, curX, curY);
}
if (lm.canScrollVertically()) {
scrollY = dragListener.calcVerticalScrollDistance(recyclerView, curX, curY);
}
// System.out.println("scroll:::::" + scrollY + "=" + recyclerView.getScrollY() + "curY::" + curY);
// System.out.println("scroll:::::" + scrollX + "=" + recyclerView.getScrollX() + "curX::" + curX);
if (scrollX != 0 || scrollY != 0) {
recyclerView.scrollBy(scrollX, scrollY);
}
return scrollX != 0 || scrollY != 0;
}
Example 2
| Source File: Utils.java From Expert-Android-Programming with MIT License | 6 votes |
|
public static boolean syncOffset(SmoothAppBarLayout smoothAppBarLayout, View target, int verticalOffset, View scroll) {
boolean isSelected = target == scroll;
if (scroll instanceof NestedScrollView) {
NestedScrollView nestedScrollView = (NestedScrollView) scroll;
if (nestedScrollView.getScrollY() < verticalOffset || (!isSelected && isScrollToTop(target))) {
nestedScrollView.scrollTo(0, verticalOffset);
}
if (isSelected && (nestedScrollView.getScrollY() < verticalOffset || verticalOffset == 0)) {
nestedScrollView.scrollTo(0, 0);
smoothAppBarLayout.syncOffset(0);
}
} else if (scroll instanceof RecyclerView) {
RecyclerView recyclerView = (RecyclerView) scroll;
boolean isAccuracy = recyclerView.getLayoutManager().findViewByPosition(ObservableRecyclerView.HEADER_VIEW_POSITION) != null;
if (isAccuracy && recyclerView.computeVerticalScrollOffset() < verticalOffset) {
recyclerView.scrollBy(0, verticalOffset - recyclerView.computeVerticalScrollOffset());
} else if (!isSelected && isScrollToTop(target)) {
recyclerView.scrollToPosition(ObservableRecyclerView.HEADER_VIEW_POSITION);
}
if (isAccuracy && isSelected && (recyclerView.computeVerticalScrollOffset() < verticalOffset || verticalOffset == 0)) {
recyclerView.scrollToPosition(ObservableRecyclerView.HEADER_VIEW_POSITION);
smoothAppBarLayout.syncOffset(0);
}
}
return true;
}
Example 3
| Source File: Utils.java From smooth-app-bar-layout with Apache License 2.0 | 6 votes |
|
public static boolean syncOffset(SmoothAppBarLayout smoothAppBarLayout, View target, int verticalOffset, View scroll) {
boolean isSelected = target == scroll;
if (scroll instanceof NestedScrollView) {
NestedScrollView nestedScrollView = (NestedScrollView) scroll;
if (nestedScrollView.getScrollY() < verticalOffset || (!isSelected && isScrollToTop(target))) {
nestedScrollView.scrollTo(0, verticalOffset);
}
if (isSelected && (nestedScrollView.getScrollY() < verticalOffset || verticalOffset == 0)) {
nestedScrollView.scrollTo(0, 0);
smoothAppBarLayout.syncOffset(0);
}
} else if (scroll instanceof RecyclerView) {
RecyclerView recyclerView = (RecyclerView) scroll;
boolean isAccuracy = recyclerView.getLayoutManager().findViewByPosition(ObservableRecyclerView.HEADER_VIEW_POSITION) != null;
if (isAccuracy && recyclerView.computeVerticalScrollOffset() < verticalOffset) {
recyclerView.scrollBy(0, verticalOffset - recyclerView.computeVerticalScrollOffset());
} else if (!isSelected && isScrollToTop(target)) {
recyclerView.scrollToPosition(ObservableRecyclerView.HEADER_VIEW_POSITION);
}
if (isAccuracy && isSelected && (recyclerView.computeVerticalScrollOffset() < verticalOffset || verticalOffset == 0)) {
recyclerView.scrollToPosition(ObservableRecyclerView.HEADER_VIEW_POSITION);
smoothAppBarLayout.syncOffset(0);
}
}
return true;
}
Example 4
| Source File: RecyclerViewScrollActivity.java From AndroidDemo with MIT License | 5 votes |
|
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
if (isMove && newState == RecyclerView.SCROLL_STATE_IDLE) {
isMove = false;
int top = layoutManager.findViewByPosition(scrollPosition).getTop();
recyclerView.scrollBy(0, top);
}
}
Example 5
| Source File: DragSortRecycler.java From OmniList with GNU Affero General Public License v3.0 | 4 votes |
|
@Override
public void onTouchEvent(RecyclerView rv, MotionEvent e) {
debugLog("onTouchEvent");
if ((e.getAction() == MotionEvent.ACTION_UP) ||
(e.getAction() == MotionEvent.ACTION_CANCEL)) {
if ((e.getAction() == MotionEvent.ACTION_UP) && selectedDragItemPos != -1) {
int newPos = getNewPostion(rv);
if (moveInterface != null)
moveInterface.onItemMoved(selectedDragItemPos, newPos);
}
setIsDragging(false);
selectedDragItemPos = -1;
floatingItem = null;
rv.invalidateItemDecorations();
return;
}
fingerY = (int) e.getY();
if (floatingItem != null) {
floatingItemBounds.top = fingerY - fingerOffsetInViewY;
if (floatingItemBounds.top < -floatingItemStatingBounds.height() / 2) //Allow half the view out the top
floatingItemBounds.top = -floatingItemStatingBounds.height() / 2;
floatingItemBounds.bottom = floatingItemBounds.top + floatingItemStatingBounds.height();
floatingItem.setBounds(floatingItemBounds);
}
//Do auto scrolling at end of list
float scrollAmount = 0;
if (fingerY > (rv.getHeight() * (1 - autoScrollWindow))) {
scrollAmount = (fingerY - (rv.getHeight() * (1 - autoScrollWindow)));
} else if (fingerY < (rv.getHeight() * autoScrollWindow)) {
scrollAmount = (fingerY - (rv.getHeight() * autoScrollWindow));
}
debugLog("Scroll: " + scrollAmount);
scrollAmount *= autoScrollSpeed;
rv.scrollBy(0, (int) scrollAmount);
rv.invalidateItemDecorations();// Redraw
}
Example 6
| Source File: ClassifyView.java From ClassifyView with Apache License 2.0 | 4 votes |
|
/**
* If user drags the view to the edge, trigger a scroll if necessary.
*/
private boolean scrollIfNecessary() {
RecyclerView recyclerView = null;
if ((mRegion & IN_MAIN_REGION) != 0) {
recyclerView = mMainRecyclerView;
}
if ((mRegion & IN_SUB_REGION) != 0) {
recyclerView = mSubRecyclerView;
}
if (recyclerView == null) return false;
final long now = System.currentTimeMillis();
final long scrollDuration = mDragScrollStartTimeInMs
== Long.MIN_VALUE ? 0 : now - mDragScrollStartTimeInMs;
RecyclerView.LayoutManager lm = recyclerView.getLayoutManager();
int scrollX = 0;
int scrollY = 0;
if (lm.canScrollHorizontally()) {
int curX = (int) (mSelectedStartX + mDx);
final int leftDiff = curX - mEdgeWidth - recyclerView.getPaddingLeft();
if (mDx < 0 && leftDiff < 0) {
scrollX = leftDiff;
} else if (mDx > 0) {
final int rightDiff =
curX + mSelected.getWidth() + mEdgeWidth - (recyclerView.getWidth() - recyclerView.getPaddingRight());
if (rightDiff > 0) {
scrollX = rightDiff;
}
}
}
if (lm.canScrollVertically()) {
int curY = (int) (mSelectedStartY + mDy);
final int topDiff = curY - mEdgeWidth - recyclerView.getPaddingTop();
if (mDy < 0 && topDiff < 0) {
scrollY = topDiff;
} else if (mDy > 0) {
final int bottomDiff = curY + mSelected.getHeight() + mEdgeWidth -
(recyclerView.getHeight() - recyclerView.getPaddingBottom());
if (bottomDiff > 0) {
scrollY = bottomDiff;
}
}
}
if (scrollX != 0) {
scrollX = interpolateOutOfBoundsScroll(recyclerView,
mSelected.getWidth(), scrollX,
recyclerView.getWidth(), scrollDuration);
}
if (scrollY != 0) {
scrollY = interpolateOutOfBoundsScroll(recyclerView,
mSelected.getHeight(), scrollY,
recyclerView.getHeight(), scrollDuration);
}
if (scrollX != 0 || scrollY != 0) {
if (mDragScrollStartTimeInMs == Long.MIN_VALUE) {
mDragScrollStartTimeInMs = now;
}
recyclerView.scrollBy(scrollX, scrollY);
return true;
}
mDragScrollStartTimeInMs = Long.MIN_VALUE;
return false;
}
Example 7
| Source File: DragSortRecycler.java From Muzesto with GNU General Public License v3.0 | 4 votes |
|
@Override
public void onTouchEvent(RecyclerView rv, MotionEvent e) {
debugLog("onTouchEvent");
if ((e.getAction() == MotionEvent.ACTION_UP) ||
(e.getAction() == MotionEvent.ACTION_CANCEL)) {
if ((e.getAction() == MotionEvent.ACTION_UP) && selectedDragItemPos != -1) {
int newPos = getNewPostion(rv);
if (moveInterface != null)
moveInterface.onItemMoved(selectedDragItemPos, newPos);
}
setIsDragging(false);
selectedDragItemPos = -1;
floatingItem = null;
rv.invalidateItemDecorations();
return;
}
fingerY = (int) e.getY();
if (floatingItem != null) {
floatingItemBounds.top = fingerY - fingerOffsetInViewY;
if (floatingItemBounds.top < -floatingItemStatingBounds.height() / 2) //Allow half the view out the top
floatingItemBounds.top = -floatingItemStatingBounds.height() / 2;
floatingItemBounds.bottom = floatingItemBounds.top + floatingItemStatingBounds.height();
floatingItem.setBounds(floatingItemBounds);
}
//Do auto scrolling at end of list
float scrollAmount = 0;
if (fingerY > (rv.getHeight() * (1 - autoScrollWindow))) {
scrollAmount = (fingerY - (rv.getHeight() * (1 - autoScrollWindow)));
} else if (fingerY < (rv.getHeight() * autoScrollWindow)) {
scrollAmount = (fingerY - (rv.getHeight() * autoScrollWindow));
}
debugLog("Scroll: " + scrollAmount);
scrollAmount *= autoScrollSpeed;
rv.scrollBy(0, (int) scrollAmount);
rv.invalidateItemDecorations();// Redraw
}
Example 8
| Source File: RecyclerViewEspressoFactory.java From ChipsLayoutManager with Apache License 2.0 | 4 votes |
|
@Override
public void performAction(UiController uiController, RecyclerView recyclerView) {
recyclerView.scrollBy(x, y);
}
Example 9
| Source File: ExtGridLayoutManager.java From dpad-aware-recycler-view with Apache License 2.0 | 4 votes |
|
@Override
public boolean requestChildRectangleOnScreen(@NonNull RecyclerView parent, @NonNull View child, @NonNull Rect rect,
boolean immediate) {
if (!mOffsetEnabled) {
return super.requestChildRectangleOnScreen(parent, child, rect, true);
}
final int parentLeft = getPaddingLeft();
final int parentTop = getPaddingTop();
final int parentRight = getWidth() - getPaddingRight();
final int parentBottom = getHeight() - getPaddingBottom();
final int childLeft = child.getLeft() + rect.left;
final int childTop = child.getTop() + rect.top;
final int childRight = childLeft + rect.width();
final int childBottom = childTop + rect.height();
int cameraLeft;
int cameraRight;
int cameraTop;
int cameraBottom;
final int cameraCenterX = (int) ((parentRight + parentLeft) * mOffsetFraction);
final int childHalfWidth = (int) Math.ceil((childRight - childLeft) * 0.5);
cameraLeft = cameraCenterX - childHalfWidth;
cameraRight = cameraCenterX + childHalfWidth;
final int cameraCenterY = (int) ((parentBottom + parentTop) * mOffsetFraction);
final int childHalfHeight = (int) Math.ceil((childBottom - childTop) * 0.5);
cameraTop = cameraCenterY - childHalfHeight;
cameraBottom = cameraCenterY + childHalfHeight;
final int offScreenLeft = Math.min(0, childLeft - cameraLeft);
final int offScreenTop = Math.min(0, childTop - cameraTop);
final int offScreenRight = Math.max(0, childRight - cameraRight);
final int offScreenBottom = Math.max(0, childBottom - cameraBottom);
// Favor the "start" layout direction over the end when bringing one side or the other
// of a large rect into view. If we decide to bring in end because start is already
// visible, limit the scroll such that start won't go out of bounds.
final int dx;
if (getLayoutDirection() == View.LAYOUT_DIRECTION_RTL) {
dx = offScreenRight != 0 ? offScreenRight
: Math.max(offScreenLeft, childRight - parentRight);
} else {
dx = offScreenLeft != 0 ? offScreenLeft
: Math.min(childLeft - parentLeft, offScreenRight);
}
// Favor bringing the top into view over the bottom. If top is already visible and
// we should scroll to make bottom visible, make sure top does not go out of bounds.
final int dy = offScreenTop != 0 ? offScreenTop
: Math.min(childTop - parentTop, offScreenBottom);
if (dx != 0 || dy != 0) {
parent.scrollBy(dx, dy);
return true;
}
return false;
}
Example 10
| Source File: DragSortRecycler.java From Slide with GNU General Public License v3.0 | 4 votes |
|
@Override
public void onTouchEvent(RecyclerView rv, MotionEvent e) {
debugLog("onTouchEvent");
if ((e.getAction() == MotionEvent.ACTION_UP) ||
(e.getAction() == MotionEvent.ACTION_CANCEL)) {
if ((e.getAction() == MotionEvent.ACTION_UP) && selectedDragItemPos != -1) {
int newPos = getNewPostion(rv);
if (moveInterface != null)
moveInterface.onItemMoved(selectedDragItemPos, newPos);
}
setIsDragging(false);
selectedDragItemPos = -1;
floatingItem = null;
rv.invalidateItemDecorations();
return;
}
fingerY = (int) e.getY();
if (floatingItem != null) {
floatingItemBounds.top = fingerY - fingerOffsetInViewY;
if (floatingItemBounds.top < -floatingItemStatingBounds.height() / 2) //Allow half the view out the top
floatingItemBounds.top = -floatingItemStatingBounds.height() / 2;
floatingItemBounds.bottom = floatingItemBounds.top + floatingItemStatingBounds.height();
floatingItem.setBounds(floatingItemBounds);
}
//Do auto scrolling at end of list
float scrollAmount = 0;
if (fingerY > (rv.getHeight() * (1 - autoScrollWindow))) {
scrollAmount = (fingerY - (rv.getHeight() * (1 - autoScrollWindow)));
} else if (fingerY < (rv.getHeight() * autoScrollWindow)) {
scrollAmount = (fingerY - (rv.getHeight() * autoScrollWindow));
}
debugLog("Scroll: " + scrollAmount);
scrollAmount *= autoScrollSpeed;
rv.scrollBy(0, (int) scrollAmount);
rv.invalidateItemDecorations();// Redraw
}
Example 11
| Source File: DragSortRecycler.java From DragSortRecycler with Apache License 2.0 | 4 votes |
|
@Override
public void onTouchEvent(RecyclerView rv, MotionEvent e) {
debugLog("onTouchEvent");
if ((e.getAction() == MotionEvent.ACTION_UP) ||
(e.getAction() == MotionEvent.ACTION_CANCEL))
{
if ((e.getAction() == MotionEvent.ACTION_UP) && selectedDragItemPos != -1)
{
int newPos = getNewPostion(rv);
if (moveInterface != null)
moveInterface.onItemMoved(selectedDragItemPos, newPos);
}
setIsDragging(false);
selectedDragItemPos = -1;
floatingItem = null;
rv.invalidateItemDecorations();
return;
}
fingerY = (int)e.getY();
if (floatingItem!=null)
{
floatingItemBounds.top = fingerY - fingerOffsetInViewY;
if (floatingItemBounds.top < -floatingItemStatingBounds.height()/2) //Allow half the view out the top
floatingItemBounds.top = -floatingItemStatingBounds.height()/2;
floatingItemBounds.bottom = floatingItemBounds.top + floatingItemStatingBounds.height();
floatingItem.setBounds(floatingItemBounds);
}
//Do auto scrolling at end of list
float scrollAmount=0;
if (fingerY > (rv.getHeight() * (1-autoScrollWindow)))
{
scrollAmount = (fingerY - (rv.getHeight() * (1-autoScrollWindow)));
}
else if (fingerY < (rv.getHeight() * autoScrollWindow))
{
scrollAmount = (fingerY - (rv.getHeight() * autoScrollWindow));
}
debugLog("Scroll: " + scrollAmount);
scrollAmount *= autoScrollSpeed;
rv.scrollBy(0, (int)scrollAmount);
rv.invalidateItemDecorations();// Redraw
}
Example 12
| Source File: DragSortRecycler.java From rox-android with Apache License 2.0 | 4 votes |
|
@Override
public void onTouchEvent(RecyclerView rv, MotionEvent e) {
debugLog("onTouchEvent");
if ((e.getAction() == MotionEvent.ACTION_UP) ||
(e.getAction() == MotionEvent.ACTION_CANCEL))
{
if ((e.getAction() == MotionEvent.ACTION_UP) && selectedDragItemPos != -1)
{
int newPos = getNewPostion(rv);
if (moveInterface != null)
moveInterface.onItemMoved(selectedDragItemPos, newPos);
}
setIsDragging(false);
selectedDragItemPos = -1;
floatingItem = null;
rv.invalidateItemDecorations();
return;
}
fingerY = (int)e.getY();
if (floatingItem!=null)
{
floatingItemBounds.top = fingerY - fingerOffsetInViewY;
if (floatingItemBounds.top < -floatingItemStatingBounds.height()/2) //Allow half the view out the top
floatingItemBounds.top = -floatingItemStatingBounds.height()/2;
floatingItemBounds.bottom = floatingItemBounds.top + floatingItemStatingBounds.height();
floatingItem.setBounds(floatingItemBounds);
}
//Do auto scrolling at end of list
float scrollAmount=0;
if (fingerY > (rv.getHeight() * (1-autoScrollWindow)))
{
scrollAmount = (fingerY - (rv.getHeight() * (1-autoScrollWindow)));
}
else if (fingerY < (rv.getHeight() * autoScrollWindow))
{
scrollAmount = (fingerY - (rv.getHeight() * autoScrollWindow));
}
debugLog("Scroll: " + scrollAmount);
scrollAmount *= autoScrollSpeed;
rv.scrollBy(0, (int)scrollAmount);
rv.invalidateItemDecorations();// Redraw
}
