TintImageView.java

/* 
 * Copyright (C) 2014 Peter Cai
 *
 * This file is part of BlackLight
 *
 * BlackLight is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * BlackLight is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with BlackLight.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.jasonchen.microlang.view;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.PorterDuff;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.ImageView;

import com.jasonchen.microlang.R;


/**
 * TintImageView is a hacked ImageView
 * It tints the image with defined in xml
 * e.g. tintColor="?attr/DrawerForeground"
 * Also optimized for displaying icons
 **/

public class TintImageView extends ImageView {
	
	public TintImageView(Context context) {
		this(context, null);
	}

	public TintImageView(Context context, AttributeSet attrs) {
		this(context, attrs, 0);
	}

	public TintImageView(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);

		if (attrs != null) {
			TypedArray arr = context.obtainStyledAttributes(attrs, R.styleable.TintImageView);
			setColorFilter(arr.getColor(R.styleable.TintImageView_tintColor, 0), PorterDuff.Mode.SRC_IN);
			arr.recycle();
		}
	}
	
	//@Override
	public void setColor(int color) {
		setColorFilter(color, PorterDuff.Mode.SRC_IN);
	}

	@Override
	protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
		// http://stackoverflow.com/questions/13992535/android-imageview-scale-smaller-image-to-width-with-flexible-height-without-crop
		// HACK: Auto-fit height/width and leave the other one flexible (keep ratio)
		Drawable d = getDrawable();
		
		if (d != null) {
			int width = MeasureSpec.getSize(widthMeasureSpec);
			int height = MeasureSpec.getSize(heightMeasureSpec);
			
			if (width >= height) {
				height = (int) Math.ceil(width * (float) d.getIntrinsicHeight() / d.getIntrinsicWidth());
			} else {
				width = (int) Math.ceil(height * (float) d.getIntrinsicWidth() / d.getIntrinsicHeight());
			}
			
			setMeasuredDimension(width, height);
		} else {
			super.onMeasure(widthMeasureSpec, heightMeasureSpec);
		}
	}
}