checkablelinearlayout

gistfile1.java

package org.dforsyth.android.garbage;

import android.content.Context;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Checkable;
import android.widget.LinearLayout;

public class CheckableLinearLayout extends LinearLayout implements Checkable {
    // This is kind of half assed but whatever.
    private boolean mChecked;
    private OnCheckedChangeListener mOnCheckedChangeListener;

    private static final int[] CHECKED_STATE_LIST = {
            android.R.attr.state_checked,
            android.R.attr.state_selected
    };

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

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

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

    @Override
    public void setChecked(boolean checked) {
        if (mChecked == checked) {
            return;
        }

        mChecked = checked;
        refreshDrawableState();

        updateCheckableChildren(this);

        if (mOnCheckedChangeListener != null) {
            mOnCheckedChangeListener.onCheckedChanged(this, mChecked);
        }
    }

    private void updateCheckableChildren(ViewGroup parent) {
        // this should probably take a checked boolean...
        int numChildren = parent.getChildCount();
        for(int i = 0; i < numChildren; i++ ) {
            View view = parent.getChildAt(i);
            if(view instanceof Checkable) {
                Checkable checkable = (Checkable) view;
                checkable.setChecked(mChecked);
            }

            if(view instanceof ViewGroup) {
                ViewGroup group = (ViewGroup) view;
                updateCheckableChildren(group);
            }
        }
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        return onTouchEvent(ev);
    }

    @Override
    protected int[] onCreateDrawableState(int extraSpace) {
        int[] drawableState = super.onCreateDrawableState(extraSpace + CHECKED_STATE_LIST.length);
        if (mChecked) {
            mergeDrawableStates(drawableState, CHECKED_STATE_LIST);
        }
        return drawableState;
    }

    @Override
    protected void drawableStateChanged() {
        super.drawableStateChanged();

        Drawable drawable = getBackground();
        if (drawable == null) {
            return;
        }

        drawable.setState(getDrawableState());
        invalidate();
    }

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

    @Override
    public void toggle() {
        setChecked(!mChecked);
    }

    @Override
    public boolean performClick() {
        toggle();
        return super.performClick();
    }

    public interface OnCheckedChangeListener {
        public void onCheckedChanged(CheckableLinearLayout layout, boolean checked);
    }

    public void setOnCheckedChangeListener(OnCheckedChangeListener listener) {
        mOnCheckedChangeListener = listener;
    }
}