CheckedLinearLayout.java

/*
 * Copyright (c) 2014. The Trustees of Indiana University.
 *
 * This version of the code is licensed under the MPL 2.0 Open Source license with additional
 * healthcare disclaimer. If the user is an entity intending to commercialize any application
 * that uses this code in a for-profit venture, please contact the copyright holder.
 */

package com.muzima.view;
// Class copied verbatim from
// https://github.com/theomega/ActivatedStateDemo/blob/master/src/de/dbruhn/android/activatedstatedemo/CheckedLinearLayout.java

import android.annotation.SuppressLint;
import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.widget.Checkable;
import android.widget.ImageView;
import android.widget.LinearLayout;

public class CheckedLinearLayout extends LinearLayout implements Checkable {

    private static final int[] CHECKED_STATE_SET = {
            android.R.attr.state_checked
    };

    private boolean checked = false;

    @SuppressLint("NewApi")
    public CheckedLinearLayout(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

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

    public CheckedLinearLayout(Context context) {
        super(context);
    }

    @Override
    public boolean isChecked() {
        return checked;
    }

    @Override
    public void setChecked(boolean checked) {
        this.checked = checked;

        refreshDrawableState();

        //Propagate to childs
        final int count = getChildCount();
        for (int i = 0; i < count; i++) {
            final View child = getChildAt(i);
            if (child instanceof Checkable) {
                ((Checkable) child).setChecked(checked);
            } else if (child instanceof ImageView) {
                child.setSelected(checked);
            }
        }
    }

    @Override
    protected int[] onCreateDrawableState(int extraSpace) {
        final int[] drawableState = super.onCreateDrawableState(extraSpace + 1);
        if (isChecked()) {
            mergeDrawableStates(drawableState, CHECKED_STATE_SET);
        }
        return drawableState;
    }

    @Override
    public void toggle() {
        this.checked = !this.checked;
    }
}