AttachedObjectWarning.java

package de.blau.android.dialogs;

import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v4.app.DialogFragment;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AlertDialog.Builder;
import android.support.v7.app.AppCompatDialog;
import android.util.Log;
import de.blau.android.App;
import de.blau.android.Main;
import de.blau.android.R;
import de.blau.android.util.ThemeUtils;

/**
 * Display a dialog asking for confirmation before starting an activity that might result in data loss.
 *
 */
public class AttachedObjectWarning extends DialogFragment
{
	
	private static final String DEBUG_TAG = AttachedObjectWarning.class.getSimpleName();
	
	private static final String TAG = "fragment_attached_object_activity";
	
	private Main main;
	
   	/**
	 * Shows a dialog warning the user that an invisible object has been changed, the user has the option
	 * of ignring the warning, supressing it and undoing the change.
	 * @param activity Activity creating the dialog and starting the intent Activity if confirmed
	 */
	static public void showDialog(FragmentActivity activity) {
		dismissDialog(activity);

		FragmentManager fm = activity.getSupportFragmentManager();
	    AttachedObjectWarning detachFragment = newInstance();
	    if (detachFragment != null) {
	    	detachFragment.show(fm, TAG);
	    } else {
	    	Log.e(DEBUG_TAG,"Unable to create detatch dialog ");
	    }
	}
	
	private static void dismissDialog(FragmentActivity activity) {
		FragmentManager fm = activity.getSupportFragmentManager();
		FragmentTransaction ft = fm.beginTransaction();
	    Fragment fragment = fm.findFragmentByTag(TAG);
	    if (fragment != null) {
	        ft.remove(fragment);
	    }
	    ft.commit();
	}
		
    /**
     */
    static private AttachedObjectWarning newInstance() {
    	AttachedObjectWarning f = new AttachedObjectWarning();
        f.setShowsDialog(true);
        
        return f;
    }
    
    @Override
    public void onAttach(Context context) {
        Log.d(DEBUG_TAG, "onAttach");
        try {
            main = (Main) context;
        } catch (ClassCastException e) {
            throw new ClassCastException(context.toString() + " must be class Main");
        }
        super.onAttach(context);
    }

    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setCancelable(true);
    }

    @NonNull
	@Override
    public AppCompatDialog onCreateDialog(Bundle savedInstanceState)
    {
    	Builder builder = new AlertDialog.Builder(getActivity());
    	builder.setIcon(ThemeUtils.getResIdFromAttribute(getActivity(),R.attr.alert_dialog));
    	builder.setTitle(R.string.attached_object_warning_title);
    	builder.setMessage(R.string.attached_object_warning_message);
    	builder.setPositiveButton(R.string.attached_object_warning_continue, new OnClickListener() {
				@Override
				public void onClick(DialogInterface arg0, int arg1) {
					// simple continue
				} } );
    	builder.setNeutralButton(R.string.attached_object_warning_stop, new OnClickListener() {
				@Override
				public void onClick(DialogInterface arg0, int arg1) {	
					App.getLogic().setAttachedObjectWarning(false);
				} } );
    	builder.setNegativeButton(R.string.undo, new OnClickListener() {
			@Override
			public void onClick(DialogInterface arg0, int arg1) {
				main.undoListener.onClick(null);
			} } );

    	return builder.create();
    }
}