package com.beloo.widget.chipslayoutmanager.layouter;
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import android.graphics.Rect;
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import android.view.View;
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import androidx.recyclerview.widget.RecyclerView;
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import com.beloo.widget.chipslayoutmanager.ChildViewsIterable;
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import com.beloo.widget.chipslayoutmanager.ChipsLayoutManager;
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abstract class Square implements ICanvas {
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RecyclerView.LayoutManager lm;
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private ChildViewsIterable childViews;
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/**
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* highest view in layout. Have always actual value, because it set in {@link ChipsLayoutManager#onLayoutChildren}
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*/
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private View topView;
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/**
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* lowest view in layout. Have always actual value, because it set in {@link ChipsLayoutManager#onLayoutChildren}
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*/
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private View bottomView;
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/**
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* The view have placed in the closest to the left border. Have always actual value, because it set in {@link ChipsLayoutManager#onLayoutChildren}
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*/
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private View leftView;
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/** The view have placed in the closest to the right border. Have always actual value, because it set in {@link ChipsLayoutManager#onLayoutChildren} */
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private View rightView;
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/** minimal position visible on screen*/
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private Integer minPositionOnScreen;
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private Integer maxPositionOnScreen;
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private boolean isFirstItemAdded;
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Square(RecyclerView.LayoutManager lm) {
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this.lm = lm;
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childViews = new ChildViewsIterable(lm);
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}
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@Override
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public Rect getCanvasRect() {
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return new Rect(getCanvasLeftBorder(), getCanvasTopBorder(), getCanvasRightBorder(), getCanvasBottomBorder());
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}
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@Override
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public Rect getViewRect(View view) {
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int left = lm.getDecoratedLeft(view);
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int top = lm.getDecoratedTop(view);
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int right = lm.getDecoratedRight(view);
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int bottom = lm.getDecoratedBottom(view);
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return new Rect(left, top, right, bottom);
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}
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@Override
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public boolean isInside(Rect rectCandidate) {
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//intersection changes rect!!!
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Rect intersect = new Rect(rectCandidate);
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return getCanvasRect().intersect(intersect);
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}
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@Override
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public boolean isInside(View viewCandidate) {
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return isInside(getViewRect(viewCandidate));
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}
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@Override
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public boolean isFullyVisible(View view) {
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Rect rect = getViewRect(view);
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return isFullyVisible(rect);
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}
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@Override
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public boolean isFullyVisible(Rect rect) {
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return rect.top >= getCanvasTopBorder()
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&& rect.bottom <= getCanvasBottomBorder()
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&& rect.left >= getCanvasLeftBorder()
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&& rect.right <= getCanvasRightBorder();
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}
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/**
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* find highest & lowest views among visible attached views
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*/
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@Override
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public void findBorderViews() {
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topView = null;
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bottomView = null;
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leftView = null;
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rightView = null;
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minPositionOnScreen = RecyclerView.NO_POSITION;
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maxPositionOnScreen = RecyclerView.NO_POSITION;
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isFirstItemAdded = false;
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if (lm.getChildCount() > 0) {
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View initView = lm.getChildAt(0);
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topView = initView;
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bottomView = initView;
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leftView = initView;
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rightView = initView;
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for (View view : childViews) {
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int position = lm.getPosition(view);
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if (!isInside(view)) continue;
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if (lm.getDecoratedTop(view) < lm.getDecoratedTop(topView)) {
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topView = view;
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}
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if (lm.getDecoratedBottom(view) > lm.getDecoratedBottom(bottomView)) {
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bottomView = view;
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}
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if (lm.getDecoratedLeft(view) < lm.getDecoratedLeft(leftView)) {
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leftView = view;
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}
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if (lm.getDecoratedRight(view) > lm.getDecoratedRight(rightView)) {
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rightView = view;
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}
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if (minPositionOnScreen == RecyclerView.NO_POSITION || position < minPositionOnScreen) {
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minPositionOnScreen = position;
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}
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if (maxPositionOnScreen == RecyclerView.NO_POSITION || position > maxPositionOnScreen) {
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maxPositionOnScreen = position;
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}
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if (position == 0) {
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isFirstItemAdded = true;
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}
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}
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}
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}
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@Override
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public View getTopView() {
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return topView;
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}
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@Override
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public View getBottomView() {
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return bottomView;
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}
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@Override
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public View getLeftView() {
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return leftView;
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}
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@Override
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public View getRightView() {
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return rightView;
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}
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@Override
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public Integer getMinPositionOnScreen() {
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return minPositionOnScreen;
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}
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@Override
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public Integer getMaxPositionOnScreen() {
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return maxPositionOnScreen;
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}
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@Override
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public boolean isFirstItemAdded() {
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return isFirstItemAdded;
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}
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}
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