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Arpit0492/EqualSpacingItemDecoration.java

Last active March 13, 2024 06:23
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  1. Arpit0492 revised this gist May 14, 2020. 1 changed file with 6 additions and 1 deletion.
    7 changes: 6 additions & 1 deletion EqualSpacingItemDecoration.java
    View file
    Original file line number Diff line number Diff line change
    @@ -62,7 +62,12 @@ private void setSpacingForDirection(Rect outRect,
    if (layoutManager instanceof GridLayoutManager) {
    GridLayoutManager gridLayoutManager = (GridLayoutManager) layoutManager;
    int cols = gridLayoutManager.getSpanCount();
    int rows = itemCount / cols;
    int rows;
    if (itemCount % cols == 0) {
    rows = itemCount / cols;
    } else {
    rows = itemCount / cols + 1;
    }

    outRect.left = leftSpacing;
    outRect.right = position % cols == cols - 1 ? rightSpacing : 0;
  2. Arpit0492 created this gist Feb 6, 2020.
    81 changes: 81 additions & 0 deletions EqualSpacingItemDecoration.java
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,81 @@
    import android.graphics.Rect;
    import android.view.View;

    import androidx.recyclerview.widget.GridLayoutManager;
    import androidx.recyclerview.widget.RecyclerView;

    public class EqualSpacingItemDecoration extends RecyclerView.ItemDecoration {
    private final int topSpacing;
    private final int leftSpacing;
    private final int rightSpacing;
    private final int bottomSpacing;
    private int displayMode;

    public static final int HORIZONTAL = 0;
    public static final int VERTICAL = 1;
    public static final int GRID = 2;

    public EqualSpacingItemDecoration(int topSpacing, int leftSpacing, int rightSpacing, int bottomSpacing) {
    this(topSpacing, leftSpacing, rightSpacing, bottomSpacing, -1);
    }

    public EqualSpacingItemDecoration(int tSpacing, int lSpacing, int rSpacing, int bSpacing , int displayMode) {
    this.topSpacing = tSpacing;
    this.leftSpacing = lSpacing;
    this.rightSpacing = rSpacing;
    this.bottomSpacing = bSpacing;
    this.displayMode = displayMode;
    }

    @Override
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
    int position = parent.getChildViewHolder(view).getAdapterPosition();
    int itemCount = state.getItemCount();
    RecyclerView.LayoutManager layoutManager = parent.getLayoutManager();
    setSpacingForDirection(outRect, layoutManager, position, itemCount);
    }

    private void setSpacingForDirection(Rect outRect,
    RecyclerView.LayoutManager layoutManager,
    int position,
    int itemCount) {

    // Resolve display mode automatically
    if (displayMode == -1) {
    displayMode = resolveDisplayMode(layoutManager);
    }

    switch (displayMode) {
    case HORIZONTAL:
    outRect.left = leftSpacing;
    outRect.right = position == itemCount - 1 ? rightSpacing : 0;
    outRect.top = topSpacing;
    outRect.bottom = bottomSpacing;
    break;
    case VERTICAL:
    outRect.left = leftSpacing;
    outRect.right = rightSpacing;
    outRect.top = topSpacing;
    outRect.bottom = position == itemCount - 1 ? bottomSpacing : 0;
    break;
    case GRID:
    if (layoutManager instanceof GridLayoutManager) {
    GridLayoutManager gridLayoutManager = (GridLayoutManager) layoutManager;
    int cols = gridLayoutManager.getSpanCount();
    int rows = itemCount / cols;

    outRect.left = leftSpacing;
    outRect.right = position % cols == cols - 1 ? rightSpacing : 0;
    outRect.top = topSpacing;
    outRect.bottom = position / cols == rows - 1 ? bottomSpacing : 0;
    }
    break;
    }
    }

    private int resolveDisplayMode(RecyclerView.LayoutManager layoutManager) {
    if (layoutManager instanceof GridLayoutManager) return GRID;
    if (layoutManager.canScrollHorizontally()) return HORIZONTAL;
    return VERTICAL;
    }
    }