Java tutorial
/* * Copyright 2016 Philip Cohn-Cort * * 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 com.fuzz.emptyhusk.prefab; import android.graphics.drawable.GradientDrawable; import android.support.annotation.NonNull; import android.support.annotation.Nullable; import android.support.v4.content.ContextCompat; import android.view.View; import android.view.ViewGroup; import android.widget.ImageView; import com.fuzz.emptyhusk.R; import com.fuzz.indicator.CutoutViewLayoutParams; import com.fuzz.indicator.clip.ClippedImageCellGenerator; /** * Generator for displaying clipped images which are proportional to * a {@link android.support.v7.widget.RecyclerView RecyclerView}. Each * cell created by {@link #createCellFor(ViewGroup, int)} displays * part of the indicator. Intended for use in concert with * {@link CVIScrollListener} and {@link RecyclerStateProxy}. * * @author Philip Cohn-Cort (Fuzz) */ public class ProportionalImageCellGenerator extends ClippedImageCellGenerator { protected int rvLength; protected int rvChildLength; @Override public void onBindChild(@NonNull View child, @NonNull CutoutViewLayoutParams lp, @Nullable View originator) { child.setBackgroundResource(lp.cellBackgroundId); if (originator != null) { rvChildLength = originator.getHeight(); if (originator.getParent() instanceof ViewGroup) { rvLength = ((ViewGroup) originator.getParent()).getHeight(); } } if (child instanceof ImageView) { GradientDrawable elongated = new GradientDrawable(); elongated.setShape(GradientDrawable.RECTANGLE); int accent = ContextCompat.getColor(child.getContext(), R.color.transparentColorAccent); float fractionOfParent = rvLength * 1.0f / rvChildLength; elongated.setColor(accent); float proposedLength = fractionOfParent * lp.perpendicularLength; elongated.setSize(lp.perpendicularLength, (int) proposedLength); ((ImageView) child).setImageDrawable(elongated); } } }