Package org.mt4j.components.visibleComponents.widgets

Source Code of org.mt4j.components.visibleComponents.widgets.MTOverlayContainer

/***********************************************************************
* mt4j Copyright (c) 2008 - 2010 Christopher Ruff, Fraunhofer-Gesellschaft All rights reserved.
*   This program is free software: you can redistribute it and/or modify
*   it under the terms of the GNU General Public License as published by
*   the Free Software Foundation, either version 3 of the License, or
*   (at your option) any later version.
*
*   This program is distributed in the hope that it will be useful,
*   but WITHOUT ANY WARRANTY; without even the implied warranty of
*   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
*   GNU General Public License for more details.
*
*   You should have received a copy of the GNU General Public License
*   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*
***********************************************************************/
package org.mt4j.components.visibleComponents.widgets;

import org.mt4j.MTApplication;
import org.mt4j.components.MTComponent;
import org.mt4j.components.StateChange;
import org.mt4j.components.StateChangeEvent;
import org.mt4j.components.StateChangeListener;
import org.mt4j.components.interfaces.IMTController;
import org.mt4j.util.camera.MTCamera;

/**
* This is a component that will try to always stay on top and will stay in place even
* if the scene's camera is moved.
* <br>Thus it can be used as a container for a GUI or a HUD (head up display).
*
* @author Christopher Ruff
*/
public class MTOverlayContainer extends MTComponent {
 
  /** The app. */
  private MTApplication app;
 
  //TODO overlay layer priorites / layer numbers to sort them by priority
 
  /**
   * Instantiates a new mT overlay container.
   *
   * @param applet the applet
   */
  public MTOverlayContainer(MTApplication applet) {
    this(applet, "unnamed overlay container");
  }

  /**
   * Instantiates a new mT overlay container.
   *
   * @param app the app
   * @param name the name
   */
  public MTOverlayContainer(MTApplication app, String name) {
    super(app, name, new MTCamera(app));
    this.app = app;
   
    this.setDepthBufferDisabled(true);

    //Send overlay group to front again if it isnt - check each frame if its on front!
    this.setController(new IMTController() {
      public void update(long timeDelta) {
        putLastInParentList();
      }
    });
   
    //Always put last in parents children list if added to a parent,
    //so the chance is higher that this is really drawn ontop of other stuff
    this.addStateChangeListener(StateChange.ADDED_TO_PARENT, new StateChangeListener() {
      public void stateChanged(StateChangeEvent evt) {
        putLastInParentList();
      }
    });
  }
 
 
  private void putLastInParentList(){
    MTComponent parent = getParent();
    if (parent != null){
      int childCount = parent.getChildCount();
     
      if childCount > 0
        && !parent.getChildByIndex(childCount-1).equals(MTOverlayContainer.this)
      ){
        MTComponent lastChild = parent.getChildByIndex(childCount-1);
        if !(lastChild instanceof MTOverlayContainer)
          &&   !(lastChild.getName().equalsIgnoreCase("Cursor Trace group"))
        ){
          //last component in canvas child list is not a overlay container:
          MTOverlayContainer.this.app.invokeLater(new Runnable() {
            public void run(){
              MTComponent parent = getParent();
              if (parent != null){
                parent.removeChild(MTOverlayContainer.this);
                parent.addChild(MTOverlayContainer.this);
              }
            }
          });
        }else{
          //last component in canvas already is a different overlay container:
//          int insertionIndex = getInsertionIndex(parent);
         
        }
      }
    }
  }
 
  /*
  private int getInsertionIndex(MTComponent parent){
    int count = parent.getChildCount();
    for (int i = 1; i <= count; i++) {
//      int index = -i;
      int checkIndex = count-i;
      MTComponent child = parent.getChildByIndex(checkIndex);
      System.out.println("Check at: " + checkIndex + " ->" + child);
     
      if (child instanceof MTOverlayContainer){
       
      }else{
        System.out.println("Found insertion place for : " + this + " at: " + checkIndex);
        return checkIndex;
      }
    }
    return 0;
  }
  */



}
 
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