ClipRevealFrame.java

package com.mlatu.tv.ui.views;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Path;
import android.util.AttributeSet;
import android.widget.FrameLayout;

public class ClipRevealFrame extends FrameLayout {

    private final String TAG = this.getClass().getSimpleName();
    private Path mRevealPath;

    boolean mClipOutlines;
    float mCenterX;
    float mCenterY;
    float mRadius;

    public ClipRevealFrame(Context context) {
        super(context);
        init();
    }

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

    public ClipRevealFrame(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }

    private void init(){
        mRevealPath = new Path();
        mClipOutlines = false;
        setWillNotDraw(false);
    }

    public void setClipOutLines(boolean shouldClip){
        mClipOutlines = shouldClip;
    }

    public void setClipCenter(final int x, final int y){
        mCenterX = x;
        mCenterY = y;
    }

    public void setClipRadius(final float radius){
        mRadius = radius;
        invalidate();
    }

    @Override
    public void draw(Canvas canvas) {
        if(!mClipOutlines){
            super.draw(canvas);
            return;
        }
        final int state = canvas.save();
        mRevealPath.reset();
        mRevealPath.addCircle(mCenterX, mCenterY, mRadius, Path.Direction.CW);
        canvas.clipPath(mRevealPath);
        super.draw(canvas);
        canvas.restoreToCount(state);
    }
}