net.simno.klingar.ui.widget.DividerItemDecoration.java Source code

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Here is the source code for net.simno.klingar.ui.widget.DividerItemDecoration.java

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/*
 * Copyright (C) 2016 Simon Norberg
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package net.simno.klingar.ui.widget;

import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.support.v4.view.ViewCompat;
import android.support.v7.widget.RecyclerView;
import android.view.View;

public class DividerItemDecoration extends RecyclerView.ItemDecoration {

    private final Drawable divider;
    private final Rect bounds = new Rect();

    public DividerItemDecoration(Drawable divider) {
        this.divider = divider;
    }

    @Override
    public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
        if (parent.getLayoutManager() == null) {
            return;
        }
        drawVertical(c, parent);
    }

    private void drawVertical(Canvas canvas, RecyclerView parent) {
        canvas.save();
        // Drawable width defines left/right padding. Drawable height defines divider height.
        final int left = parent.getPaddingStart() + divider.getIntrinsicWidth();
        final int right = parent.getWidth() - parent.getPaddingEnd() - divider.getIntrinsicWidth();

        final int childCount = parent.getChildCount();
        for (int i = 0; i < childCount; i++) {
            final View child = parent.getChildAt(i);
            parent.getDecoratedBoundsWithMargins(child, bounds);
            final int bottom = bounds.bottom + Math.round(ViewCompat.getTranslationY(child));
            final int top = bottom - divider.getIntrinsicHeight();
            divider.setBounds(left, top, right, bottom);
            divider.draw(canvas);
        }
        canvas.restore();
    }

    @Override
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
        outRect.set(0, 0, 0, divider.getIntrinsicHeight());
    }
}