RenderableAdapter.java

package trikita.anvil;

import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.FrameLayout;

import java.util.List;

public abstract class RenderableAdapter extends BaseAdapter {

    private int currentPosition = -1;

    public interface Item<T> {
        void view(int index, T item);
    }

    public static <T> RenderableAdapter withItems(final List<T> items, final Item<T> r) {
        return new RenderableAdapter() {
            public int getCount() {
                return items.size();
            }
            public T getItem(int pos) {
                return items.get(pos);
            }
            public void view(int pos) {
                r.view(pos, getItem(pos));
            }
        };
    }

    @Override
    public View getView(int pos, View convertView, ViewGroup parent) {
        View v = convertView;
        if (v == null) {
            currentPosition = pos;
            FrameLayout vg = new FrameLayout(parent.getContext());
            Anvil.Mount m = new Anvil.Mount(vg, new Anvil.Renderable() {
                public void view() {
                    RenderableAdapter.this.view(currentPosition);
                }
            });
            Anvil.render(m);
            vg.setTag(m);
            v = vg;
        } else {
            Anvil.Mount m = (Anvil.Mount) v.getTag();
            currentPosition = pos;
            Anvil.render(m);
        }
        return v;
    }

    @Override
    public long getItemId(int pos) {
        return pos; // just a most common implementation
    }

    public abstract void view(int index);
}