Java Code Examples for androidx.recyclerview.widget.StaggeredGridLayoutManager#LayoutParams

@NonNull
@Override
public Item<DATA> dispatchCreateItem(@NonNull ViewGroup parent) {
    @NonNull
    Item<DATA> item = createAssemblyItem(parent);

    if (fullSpanInStaggeredGrid) {
        ViewGroup.LayoutParams layoutParams = item.getItemView().getLayoutParams();
        if (layoutParams instanceof StaggeredGridLayoutManager.LayoutParams) {
            ((StaggeredGridLayoutManager.LayoutParams) layoutParams).setFullSpan(true);
            item.getItemView().setLayoutParams(layoutParams);
        }
    }

    item.onInit(parent.getContext());

    Item<DATA> finalItem = inRecycler ? new RecyclerItemWrapper<>(item) : item;

    registerListeners(finalItem);

    return finalItem;
}
 

@Override
public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {

    outRect.bottom = space;

    int position = parent.getChildAdapterPosition(view);


    StaggeredGridLayoutManager.LayoutParams params = (StaggeredGridLayoutManager.LayoutParams) view.getLayoutParams();
    if (params.getSpanIndex() % 2 != 0) {
        //右边
        outRect.left = space / 2;
        outRect.right = space;
    } else {
        //左边
        outRect.left = space;
        outRect.right = space / 2;
    }

    if (position == 0) {
        outRect.top = 0;
        outRect.right = 0;
        outRect.left = 0;
    }
}
 

@Override
public void getItemOffsets(@NonNull Rect outRect, @NonNull View view, @NonNull RecyclerView parent,
                           @NonNull RecyclerView.State state) {
    super.getItemOffsets(outRect, view, parent, state);

    StaggeredGridLayoutManager.LayoutParams layoutParams = (StaggeredGridLayoutManager.LayoutParams) view.getLayoutParams();

    int spanIndex = layoutParams.getSpanIndex();

    int halfOffset = mItemOffset / 2;

    if (spanIndex == 0) {
        outRect.set(0, 0, halfOffset, 0);
    } else {
        outRect.set(halfOffset, 0, 0, 0);
    }
}
 

/**
 * 添加HeadView或FootView或LoadMore或EmptyView后
 * 兼容StaggeredGridLayoutManager的方法
 */
@Override
public void onViewAttachedToWindow(RcvHolder holder)
{
    super.onViewAttachedToWindow(holder);
    if (isInHeadViewPos(holder.getLayoutPosition())
            || isInFootViewPos(holder.getLayoutPosition())
            || isInLoadMorePos(holder.getLayoutPosition())
            || isInEmptyStatus())
    {
        ViewGroup.LayoutParams lp = holder.itemView.getLayoutParams();
        if (lp != null && lp instanceof StaggeredGridLayoutManager.LayoutParams)
        {
            StaggeredGridLayoutManager.LayoutParams p = (StaggeredGridLayoutManager.LayoutParams) lp;
            p.setFullSpan(true);
        }
    }
}
 

@Override
public void onBindViewHolder(BrickViewHolder holder, int position) {
    BaseBrick baseBrick = dataManager.brickAtPosition(position);
    if (baseBrick != null) {
        if (recyclerView.getLayoutManager() instanceof StaggeredGridLayoutManager) {
            if (holder.itemView.getLayoutParams() instanceof StaggeredGridLayoutManager.LayoutParams) {
                ((StaggeredGridLayoutManager.LayoutParams) holder.itemView.getLayoutParams()).setFullSpan(
                        baseBrick.getSpanSize().getSpans(recyclerView.getContext()) == dataManager.getMaxSpanCount());
            }
        }

        if (baseBrick.isDataReady()) {
            baseBrick.onBindData(holder);
        } else {
            baseBrick.onBindPlaceholder(holder);
        }
        if (onReachedItemAtPosition != null) {
            onReachedItemAtPosition.bindingItemAtPosition(position);
        }
    }
}
 

@Override
public void onViewAttachedToWindow(@NonNull VH holder) {
    if (isParentItem(holder.getAdapterPosition())) {
        ViewGroup.LayoutParams lp = holder.itemView.getLayoutParams();
        if (lp instanceof StaggeredGridLayoutManager.LayoutParams) {
            StaggeredGridLayoutManager.LayoutParams p = (StaggeredGridLayoutManager.LayoutParams)lp;
            p.setFullSpan(true);
        }
    }
}
 

@Nullable
private StaggeredGridLayoutManager.LayoutParams getLayoutParams(@Nullable View view) {
    if (view != null) {
        try {
            return (StaggeredGridLayoutManager.LayoutParams) view.getLayoutParams();
        } catch (Exception e) {
            LogUtil.d(Log.getStackTraceString(e));
        }
    }
    return null;
}
 

@Override
public void onViewAttachedToWindow(@NonNull RecyclerView.ViewHolder holder) {
    if (isHeaderOrFooter(holder)) {
        ViewGroup.LayoutParams lp = holder.itemView.getLayoutParams();
        if (lp instanceof StaggeredGridLayoutManager.LayoutParams) {
            StaggeredGridLayoutManager.LayoutParams p = (StaggeredGridLayoutManager.LayoutParams)lp;
            p.setFullSpan(true);
        }
    } else {
        mAdapter.onViewAttachedToWindow(holder);
    }
}
 

@Override
public void getItemOffsets(@NonNull Rect outRect, @NonNull View view, @NonNull RecyclerView parent, @NonNull RecyclerView.State state) {
    super.getItemOffsets(outRect, view, parent, state);
    final int position = parent.getChildAdapterPosition(view);
    final StaggeredGridLayoutManager.LayoutParams lp = (StaggeredGridLayoutManager.LayoutParams) view.getLayoutParams();

    if (adapter.getItemViewType(position) == ItemAdapter.TYPE_SECTION) {
        lp.setFullSpan(true);
    } else {
        final int spanIndex = lp.getSpanIndex();

        if (position >= 0) {
            // First row gets some spacing at the top
            if (position < spanCount && position < adapter.getFirstPositionOfViewType(ItemAdapter.TYPE_SECTION)) {
                outRect.top = gutter;
            }

            // First column gets some spacing at the left and the right side
            if (spanIndex == 0) {
                outRect.left = gutter;
            }

            // All columns get some spacing at the bottom and at the right side
            outRect.right = gutter;
            outRect.bottom = gutter;
        }
    }
}
 

@Override
public void onViewAttachedToWindow(RcvHolder holder)
{
    if (isSectionLabelViewType(holder.getItemViewType()))
    {
        ViewGroup.LayoutParams lp = holder.itemView.getLayoutParams();
        if (lp != null && lp instanceof StaggeredGridLayoutManager.LayoutParams)
        {
            StaggeredGridLayoutManager.LayoutParams p = (StaggeredGridLayoutManager.LayoutParams) lp;
            p.setFullSpan(true);
        }
    }
    super.onViewAttachedToWindow(holder);
}
 

private void fullSpan(boolean fullspan) {
    if (mView != null) {
        StaggeredGridLayoutManager.LayoutParams layoutParams =
                new StaggeredGridLayoutManager.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
                        ViewGroup.LayoutParams.WRAP_CONTENT);
        layoutParams.setFullSpan(fullspan);
        mView.setLayoutParams(layoutParams);
    }
}
 

private void handleLayoutIfStaggeredGridLayout(RecyclerView.ViewHolder holder, int position) {
    if (isEmptyPosition(position) || judgeType(position) == TYPE_HEADER || judgeType(position) == TYPE_FOOTER) {
        StaggeredGridLayoutManager.LayoutParams p = (StaggeredGridLayoutManager.LayoutParams)
                holder.itemView.getLayoutParams();
        p.setFullSpan(true);
    }
}
 

private boolean isStaggeredGridLayout(RecyclerView.ViewHolder holder) {
    ViewGroup.LayoutParams layoutParams = holder.itemView.getLayoutParams();
    if (layoutParams instanceof StaggeredGridLayoutManager.LayoutParams) {
        return true;
    }
    return false;
}
 

private void fullSpan(boolean fullspan) {
    if (mView != null) {
        StaggeredGridLayoutManager.LayoutParams layoutParams =
                new StaggeredGridLayoutManager.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
                        ViewGroup.LayoutParams.WRAP_CONTENT);
        layoutParams.setFullSpan(fullspan);
        mView.setLayoutParams(layoutParams);
    }
}
 

@Override
public void onViewAttachedToWindow(K holder) {
    super.onViewAttachedToWindow(holder);
    int position = holder.getAdapterPosition();
    int type = getItemViewType(position);
    if (isFullSpanType(type)) {
        ViewGroup.LayoutParams layoutParams = holder.itemView.getLayoutParams();
        if (layoutParams instanceof StaggeredGridLayoutManager.LayoutParams) {
            StaggeredGridLayoutManager.LayoutParams lp = (StaggeredGridLayoutManager.LayoutParams) layoutParams;
            lp.setFullSpan(true);
        }
    }
}
 

private void bindHeader(HeaderViewHolder headerHolder) {
    StaggeredGridLayoutManager.LayoutParams layoutParams =
            (StaggeredGridLayoutManager.LayoutParams)headerHolder.itemView.getLayoutParams();
    layoutParams.setFullSpan(true);

    boolean noCustomBanner =
            !CustomBanner.useCustomBanner(context, screenHeight, screenWidth, headerHolder.headerImage, CustomBanner.Banner.HOME);
    if (noCustomBanner) {
        headerHolder.headerImage.setImageResource(R.drawable.commcare_logo);
    }
}
 

@Override
public void onViewAttachedToWindow(@NonNull RecyclerView.ViewHolder holder) {
    ViewGroup.LayoutParams lp = holder.itemView.getLayoutParams();
    if (lp instanceof StaggeredGridLayoutManager.LayoutParams
            && holder.getLayoutPosition() == 0) {
        StaggeredGridLayoutManager.LayoutParams p = (StaggeredGridLayoutManager.LayoutParams) lp;
        p.setFullSpan(true);
    }
}
 

/**
 * 处理 StaggeredGridLayoutManager 添加头尾布局占满屏幕宽的情况
 */
@Override
public void onViewAttachedToWindow(RecyclerView.ViewHolder holder) {
    super.onViewAttachedToWindow(holder);
    ViewGroup.LayoutParams lp = holder.itemView.getLayoutParams();
    if (lp != null
            && lp instanceof StaggeredGridLayoutManager.LayoutParams
            && (isHeader(holder.getLayoutPosition()) || isFooter(holder.getLayoutPosition()))) {
        StaggeredGridLayoutManager.LayoutParams p = (StaggeredGridLayoutManager.LayoutParams) lp;
        p.setFullSpan(true);
    }
}
 

@Override
public void getItemOffsets(@NonNull Rect outRect, @NonNull View view,
                           @NonNull RecyclerView parent, @NonNull RecyclerView.State state) {
    super.getItemOffsets(outRect, view, parent, state);

    RecyclerView.LayoutManager layoutManager = parent.getLayoutManager();
    if (layoutManager == null) {
        return;
    }

    FollowingAdapter adapter = (FollowingAdapter) parent.getAdapter();
    if (adapter == null) {
        return;
    }

    parentPaddingLeft = parent.getPaddingLeft();
    parentPaddingRight = parent.getPaddingRight();
    parentPaddingTop = parent.getPaddingTop();
    parentPaddingBottom = parent.getPaddingBottom();
    insets = getWindowInset(parent);
    if (parentPaddingLeft != insets.left
            || parentPaddingRight != insets.right
            || parentPaddingTop != 0
            || parentPaddingBottom != insets.bottom) {
        setParentPadding(parent, insets);
    }

    StaggeredGridLayoutManager.LayoutParams params
            = (StaggeredGridLayoutManager.LayoutParams) view.getLayoutParams();

    int spanCount = ((StaggeredGridLayoutManager) layoutManager).getSpanCount();
    int spanIndex = params.getSpanIndex();

    if (adapter.isPhotoItem(params.getViewAdapterPosition())) {
        if (spanCount == 1) {
            outRect.set(
                    marginSingleSpanPhoto.left,
                    0,
                    marginSingleSpanPhoto.right,
                    marginSingleSpanPhoto.bottom
            );
        } else {
            if (spanIndex == 0) {
                outRect.set(marginGridItem, 0, marginGridItem, marginGridItem);
            } else {
                outRect.set(0, 0, marginGridItem, marginGridItem);
            }
        }
    }
}
 

/**
 * When set to true, the item will layout using all span area. That means, if orientation
 * is vertical, the view will have full width; if orientation is horizontal, the view will
 * have full height.
 * if the hold view use StaggeredGridLayoutManager they should using all span area
 *
 * @param holder True if this item should traverse all spans.
 */
protected void setFullSpan(RecyclerView.ViewHolder holder) {
    if (holder.itemView.getLayoutParams() instanceof StaggeredGridLayoutManager.LayoutParams) {
        StaggeredGridLayoutManager.LayoutParams params = (StaggeredGridLayoutManager.LayoutParams) holder
                .itemView.getLayoutParams();
        params.setFullSpan(true);
    }
}