HideShowImgSet.java

/*
 Swisscom Safe Connect
 Copyright (C) 2014 Swisscom

 This program 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.

 This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
*/
package com.swisscom.safeconnect.view;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.widget.ImageView;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by vadim on 05.11.14.
 */
public class HideShowImgSet extends ImageView {
    private static class ImgData {
        Bitmap bitmap;
        int width;
        int height;
        float x;
        float y;
    }

    private int width, height;

    private List<ImgData> imgSet = new ArrayList<ImgData>();

    public HideShowImgSet(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        width = w;
        height = h;
        for (ImgData img: imgSet) {
            img.y = img.y * h / oldh;
        }
    }

    /**
     * loads image, sets the width and height and horizontal pos
     * vertically it will be placed so as it lies beyond the visible
     * rect of this view
     * @param resId img to load
     * @param width
     * @param height
     * @param x horizontal pos
     */
    public void addImage(int resId, int width, int height, float x) {
        ImgData img = new ImgData();
        img.bitmap = BitmapFactory.decodeResource(getResources(), resId);
        img.bitmap = Bitmap.createScaledBitmap(img.bitmap, width, height, false);
        img.x = x;
        img.y = this.height + height;
        img.width = width;
        img.height = height;
        imgSet.add(img);
    }

    /**
     * moves the specified image
     * @param index img index to move
     * @param percent 0 means img lies beyound the lower border of the view, 1 means img bottom is
     *                aligned with view's bottom
     */
    public void moveImg(int index, float percent) {
        if (index < 0 || index >= imgSet.size()) return;
        ImgData img = imgSet.get(index);
        img.y = height - img.height * percent;
        invalidate();
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        for (ImgData img: imgSet) {
            canvas.drawBitmap(img.bitmap, img.x, img.y, null);
        }
    }
}