package com.innercirclesoftware.drawabletest;

import android.content.Context;
import android.graphics.Outline;
import android.graphics.Path;
import android.graphics.Rect;
import android.graphics.Region;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v7.widget.AppCompatImageButton;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewOutlineProvider;

public class DiamondImageButton extends AppCompatImageButton {

    @Nullable private Region clickRegion;

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

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

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

    private void init() {
        setOutlineProvider(new ViewOutlineProvider() {
            @Override
            public void getOutline(View view, Outline outline) {
                int left = 0;
                int top = 0;
                int right = view.getWidth();
                int bottom = view.getHeight();
                int centerX = (left + right) / 2;
                int centerY = (top + bottom) / 2;

                Path path = new Path();
                path.moveTo(centerX, top);
                path.lineTo(left, centerY);
                path.lineTo(centerX, bottom);
                path.lineTo(right, centerY);
                path.close();

                setClickRegion(path);

                outline.setConvexPath(path);
            }
        });
    }

    private void setClickRegion(@NonNull Path clipPath) {
        Rect clipBounds = new Rect(0, 0, getWidth(), getHeight());

        this.clickRegion = new Region();
        this.clickRegion.setPath(clipPath, new Region(clipBounds));
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        int x = (int) event.getX();
        int y = (int) event.getY();

        if (clickRegion != null && !clickRegion.contains(x, y)) {
            //clicked outside the diamond
            return false;
        }

        return super.onTouchEvent(event);
    }
}