package android.graphics.drawable;

import android.content.res.Resources;

public class DrawableContainer extends Drawable {

	private DrawableContainerState state;
	private int curIndex = -1;

	protected native long native_constructor();
	protected native void native_selectChild(long container, long child);

	public DrawableContainer() {
		paintable = native_constructor();
	}

	public boolean selectDrawable(int idx) {
		if (idx >= 0 && idx < state.childCount && idx != curIndex && state.drawables[idx] != null) {
			curIndex = idx;
			native_selectChild(paintable, state.drawables[idx].paintable);
			return true;
		}
		return false;
	}

	protected void setConstantState(DrawableContainerState state) {
		this.state = state;
	}

	public static class DrawableContainerState {

		private Drawable drawables[] = new Drawable[10];
		private int childCount = 0;

		public DrawableContainerState(DrawableContainerState orig, DrawableContainer owner, Resources res) {
		}
		
		public int getCapacity() {
			return drawables.length;
		}

		public int getChildCount() {
			return childCount;
		}

		public int addChild(Drawable dr) {
			if (childCount >= drawables.length) {
				growArray(drawables.length, drawables.length * 2);
			}
			drawables[childCount] = dr;
			return childCount++;
		}

		public void growArray(int oldSize, int newSize) {
				Drawable[] newDrawables = new Drawable[newSize];
				System.arraycopy(drawables, 0, newDrawables, 0, oldSize);
				drawables = newDrawables;
		}
	}
	
}