001/* 002 * This library is part of OpenCms - 003 * the Open Source Content Management System 004 * 005 * Copyright (C) Alkacon Software (http://www.alkacon.com) 006 * 007 * This library is free software; you can redistribute it and/or 008 * modify it under the terms of the GNU Lesser General Public 009 * License as published by the Free Software Foundation; either 010 * version 2.1 of the License, or (at your option) any later version. 011 * 012 * This library is distributed in the hope that it will be useful, 013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 015 * Lesser General Public License for more details. 016 * 017 * For further information about Alkacon Software, please see the 018 * company website: http://www.alkacon.com 019 * 020 * For further information about OpenCms, please see the 021 * project website: http://www.opencms.org 022 * 023 * You should have received a copy of the GNU Lesser General Public 024 * License along with this library; if not, write to the Free Software 025 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 026 */ 027 028package org.opencms.gwt.client.dnd; 029 030import java.util.ArrayList; 031import java.util.List; 032 033import com.google.web.bindery.event.shared.HandlerRegistration; 034 035/** 036 * A DND controller which forwards method calls to multiple other DND controllers.<p> 037 */ 038public class CmsCompositeDNDController implements I_CmsDNDController { 039 040 /** The list of internal controllers. */ 041 List<I_CmsDNDController> m_controllers = new ArrayList<I_CmsDNDController>(); 042 043 /** 044 * Adds another sub-controller to this controller.<p> 045 * 046 * @param controller the controller to add 047 * 048 * @return a registration object to remove the controller later 049 */ 050 public HandlerRegistration addController(final I_CmsDNDController controller) { 051 052 m_controllers.add(controller); 053 return new HandlerRegistration() { 054 055 public void removeHandler() { 056 057 m_controllers.remove(controller); 058 } 059 }; 060 } 061 062 /** 063 * @see org.opencms.gwt.client.dnd.I_CmsDNDController#onAnimationStart(org.opencms.gwt.client.dnd.I_CmsDraggable, org.opencms.gwt.client.dnd.I_CmsDropTarget, org.opencms.gwt.client.dnd.CmsDNDHandler) 064 */ 065 public void onAnimationStart(I_CmsDraggable draggable, I_CmsDropTarget target, CmsDNDHandler handler) { 066 067 for (I_CmsDNDController controller : m_controllers) { 068 controller.onAnimationStart(draggable, target, handler); 069 } 070 } 071 072 /** 073 * @see org.opencms.gwt.client.dnd.I_CmsDNDController#onBeforeDrop(org.opencms.gwt.client.dnd.I_CmsDraggable, org.opencms.gwt.client.dnd.I_CmsDropTarget, org.opencms.gwt.client.dnd.CmsDNDHandler) 074 */ 075 public boolean onBeforeDrop(I_CmsDraggable draggable, I_CmsDropTarget target, CmsDNDHandler handler) { 076 077 boolean result = true; 078 for (I_CmsDNDController controller : m_controllers) { 079 result &= controller.onBeforeDrop(draggable, target, handler); 080 } 081 return result; 082 } 083 084 /** 085 * @see org.opencms.gwt.client.dnd.I_CmsDNDController#onDragCancel(org.opencms.gwt.client.dnd.I_CmsDraggable, org.opencms.gwt.client.dnd.I_CmsDropTarget, org.opencms.gwt.client.dnd.CmsDNDHandler) 086 */ 087 public void onDragCancel(I_CmsDraggable draggable, I_CmsDropTarget target, CmsDNDHandler handler) { 088 089 for (I_CmsDNDController controller : m_controllers) { 090 controller.onDragCancel(draggable, target, handler); 091 } 092 } 093 094 /** 095 * @see org.opencms.gwt.client.dnd.I_CmsDNDController#onDragStart(org.opencms.gwt.client.dnd.I_CmsDraggable, org.opencms.gwt.client.dnd.I_CmsDropTarget, org.opencms.gwt.client.dnd.CmsDNDHandler) 096 */ 097 public boolean onDragStart(I_CmsDraggable draggable, I_CmsDropTarget target, CmsDNDHandler handler) { 098 099 boolean result = true; 100 for (I_CmsDNDController controller : m_controllers) { 101 result &= controller.onDragStart(draggable, target, handler); 102 } 103 return result; 104 } 105 106 /** 107 * @see org.opencms.gwt.client.dnd.I_CmsDNDController#onDrop(org.opencms.gwt.client.dnd.I_CmsDraggable, org.opencms.gwt.client.dnd.I_CmsDropTarget, org.opencms.gwt.client.dnd.CmsDNDHandler) 108 */ 109 public void onDrop(I_CmsDraggable draggable, I_CmsDropTarget target, CmsDNDHandler handler) { 110 111 for (I_CmsDNDController controller : m_controllers) { 112 controller.onDrop(draggable, target, handler); 113 } 114 } 115 116 /** 117 * @see org.opencms.gwt.client.dnd.I_CmsDNDController#onPositionedPlaceholder(org.opencms.gwt.client.dnd.I_CmsDraggable, org.opencms.gwt.client.dnd.I_CmsDropTarget, org.opencms.gwt.client.dnd.CmsDNDHandler) 118 */ 119 public void onPositionedPlaceholder(I_CmsDraggable draggable, I_CmsDropTarget target, CmsDNDHandler handler) { 120 121 for (I_CmsDNDController controller : m_controllers) { 122 controller.onPositionedPlaceholder(draggable, target, handler); 123 } 124 } 125 126 /** 127 * @see org.opencms.gwt.client.dnd.I_CmsDNDController#onTargetEnter(org.opencms.gwt.client.dnd.I_CmsDraggable, org.opencms.gwt.client.dnd.I_CmsDropTarget, org.opencms.gwt.client.dnd.CmsDNDHandler) 128 */ 129 public boolean onTargetEnter(I_CmsDraggable draggable, I_CmsDropTarget target, CmsDNDHandler handler) { 130 131 boolean result = true; 132 for (I_CmsDNDController controller : m_controllers) { 133 result &= controller.onTargetEnter(draggable, target, handler); 134 } 135 return result; 136 } 137 138 /** 139 * @see org.opencms.gwt.client.dnd.I_CmsDNDController#onTargetLeave(org.opencms.gwt.client.dnd.I_CmsDraggable, org.opencms.gwt.client.dnd.I_CmsDropTarget, org.opencms.gwt.client.dnd.CmsDNDHandler) 140 */ 141 public void onTargetLeave(I_CmsDraggable draggable, I_CmsDropTarget target, CmsDNDHandler handler) { 142 143 for (I_CmsDNDController controller : m_controllers) { 144 controller.onTargetLeave(draggable, target, handler); 145 } 146 } 147 148}