hostage/src/de/tudarmstadt/informatik/hostage/ui2/popup/AbstractPopup.java

package de.tudarmstadt.informatik.hostage.ui2.popup;

import android.app.Activity;
import android.content.Context;
import android.graphics.Rect;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.LinearLayout;
import android.widget.PopupWindow;

/**
 * Created by Julien on 13.02.14.
 */
public abstract class AbstractPopup {

    public interface OnPopupItemClickListener {
        public void onItemClick(AbstractPopupItem item);
    }

    private PopupWindow popupWindow;
    private Activity context;
    private OnPopupItemClickListener onPopupItemClickListener;
    private LinearLayout rootView;
    private LayoutInflater lInf;

    abstract public int getLayoutId();
    abstract void configureView(View view);

    public AbstractPopup(Context context, OnPopupItemClickListener listener) {
        super();
        this.context = (Activity) context;
        this.onPopupItemClickListener = listener;
        this.popupWindow = new PopupWindow(context);
        this.popupWindow.setOutsideTouchable(true);
        this.popupWindow.setFocusable(true);
        this.lInf = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

    }

    public void addItem(final AbstractPopupItem item)	{
        View view = item.getItemView();

        if (this.rootView == null){
            this.rootView = (LinearLayout) lInf.inflate(this.getLayoutId(), null);
            this.configureView(this.rootView);
        }
        if (this.rootView != null){
            this.rootView.addView(view);
            view.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    onPopupItemClickListener.onItemClick(item);
                    popupWindow.dismiss();
                }
            });
        }

    }

    public View getPopupView(){
        return rootView;
    }

    public void showOnView(View view)	{
        if (this.rootView == null){
            this.rootView = (LinearLayout) lInf.inflate(this.getLayoutId(), null);
        }


        popupWindow.setContentView(rootView);

        Rect rectagle= new Rect();
        Window window= this.context.getWindow();
        window.getDecorView().getWindowVisibleDisplayFrame(rectagle);

        int[] position = new int[2];
        view.getLocationOnScreen(position);

        rootView.measure(WindowManager.LayoutParams.WRAP_CONTENT, WindowManager.LayoutParams.WRAP_CONTENT);

        int x = position[0] + (view.getWidth() / 2) - (rootView.getMeasuredWidth() / 2);
        int y = position[1] - rootView.getMeasuredHeight();

        x = Math.min(0,x);
        x = Math.max(rectagle.width()-rootView.getMeasuredWidth(), x);

        y = Math.min(0,y);
        y = Math.max(rectagle.height()-rootView.getMeasuredHeight(), y);

        this.configureView(rootView);

        int smallBottomOffset = 10;

        popupWindow.setWidth(rootView.getMeasuredWidth());
        popupWindow.setHeight(rootView.getMeasuredHeight() + smallBottomOffset);

        popupWindow.showAtLocation(view, Gravity.NO_GRAVITY, x, y);
    }

}