full rewrite to support scaleType

[farfromrefug]

I needed scaleType to work with an imageView. That pr does that.
Here is a simple example on how to use it

imageView = new ImageView(context) {
            @Override
            protected void onSizeChanged(int w, int h, int oldw, int oldh) {
                Drawable drawable  = imageView.getDrawable(); 

                if (!(drawable instanceof SVGDrawable)) {
                    return;
                } 
                imageView.setImageDrawable(null); 
                int vWidth = getWidth() - getPaddingLeft() - getPaddingRight();
                int vHeight = getHeight() - getPaddingTop() - getPaddingBottom();
                ((SVGDrawable)drawable).adjustToParentSize(vWidth, vHeight);
                imageView.setImageDrawable(drawable);
            }

            @Override
            public void setScaleType (ScaleType scaleType) {
                super.setScaleType(scaleType);
                Drawable drawable  = getDrawable(); 

                if (!(drawable instanceof SVGDrawable)) {
                    return;
                } 
                setImageDrawable(null); 
                ((SVGDrawable)drawable).setScaleType(scaleType);
                int vWidth = getWidth() - getPaddingLeft() - getPaddingRight();
                int vHeight = getHeight() - getPaddingTop() - getPaddingBottom();
                ((SVGDrawable)drawable).adjustToParentSize(vWidth, vHeight);
                setImageDrawable(drawable);
            } 

            @Override
            public void setImageDrawable(Drawable drawable) {
                if (!(drawable instanceof SVGDrawable)) {
                    super.setImageDrawable(drawable);
                    return;
                }
                if (getDrawable() == drawable) {
                    return;
                }
                SVGDrawable svg = (SVGDrawable) drawable;
                svg.setScaleType(getScaleType());
                int vWidth = getWidth() - getPaddingLeft() - getPaddingRight();
                int vHeight = getHeight() - getPaddingTop()
                        - getPaddingBottom();
                svg.adjustToParentSize(vWidth, vHeight);
                super.setImageDrawable(svg);
            }
        };

[TrevorPage]

Thank you so much for this work :) I promise I'll look at your pull requests as soon as I can.