/*
* Copyright 2007 Michał Baliński
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package pl.balon.gwt.diagrams.client.connection;
import java.util.ArrayList;
import java.util.List;
import pl.balon.gwt.diagrams.client.connection.calculator.ConnectionDataCalculator;
import pl.balon.gwt.diagrams.client.connection.calculator.FullRectilinearTwoEndedCalculator;
import pl.balon.gwt.diagrams.client.connection.data.ConnectionData;
import pl.balon.gwt.diagrams.client.connection.data.Point;
import pl.balon.gwt.diagrams.client.connector.Connector;
import com.google.gwt.user.client.DOM;
import com.google.gwt.user.client.Element;
/**
* Rectilinear connection widget
*
* @author Michał Baliński (michal.balinski@gmail.com)
*/
public class RectilinearTwoEndedConnection extends AbstractConnection {
/**
* DOM elements representing connection in browser dom tree
*/
private List/*<Element>*/ elements = new ArrayList();
/**
* Constructs connection
*/
public RectilinearTwoEndedConnection(Connector[] toConnect) {
super(toConnect);
if( toConnect.length != 2 ){
throw new IllegalArgumentException("Need exactly two connectors to connect");
}
setElement(DOM.createDiv());
addStyleName("gwt-diagrams-connection");
}
/**
* Constructs connection
*/
public RectilinearTwoEndedConnection(Connector c1, Connector c2) {
this(new Connector[]{c1, c2});
}
/**
* @see pl.balon.gwt.diagrams.client.connection.AbstractConnection#createCalculator()
*/
protected ConnectionDataCalculator createCalculator() {
return new FullRectilinearTwoEndedCalculator();
}
/**
* @see pl.balon.gwt.diagrams.client.connection.AbstractConnection#update(pl.balon.gwt.diagrams.client.connection.data.ConnectionData)
*/
protected void update(ConnectionData data) {
if( data.getPoints().size() <= 1 ){
throw new IllegalArgumentException("Too few connection points");
}
prepareElements(data.getPoints().size()-1);
for (int i = 0; i < elements.size(); i++) {
Element div = (Element) elements.get(i);
Point start = (Point) data.getPoints().get(i);
Point end = (Point) data.getPoints().get(i+1);
String style = "gwt-diagrams-line";
DOM.setElementAttribute(div, "style", "");
DOM.setElementProperty(div, "className", style);
DOM.setStyleAttribute(div, "height", "1"); // TODO from css (IE impl bug)
DOM.setStyleAttribute(div, "width", "1"); // TODO from css (IE impl bug)
if( start.left == end.left ) {
style += " gwt-diagrams-line-vertical";
DOM.setStyleAttribute(div, "height", Integer.toString( Math.abs(start.top - end.top) ));
} else if( start.top == end.top ) {
DOM.setStyleAttribute(div, "width", Integer.toString( Math.abs(start.left - end.left) ));
style += " gwt-diagrams-line-horizontal";
}
// } else {
// We are silent, nobody notice that inconsistence ;)
// throw new IllegalStateException("Illegal state for right angeled connection");
// }
DOM.setStyleAttribute(div, "left", Integer.toString( Math.min(start.left, end.left) ));
DOM.setStyleAttribute(div, "top", Integer.toString( Math.min(start.top, end.top) ));
DOM.setElementProperty(div, "className", style);
}
}
/**
* Recalculates elements collection. Creates new or remove some if
* necessary.
*/
private void prepareElements(int count) {
// New lines if too few
for (int i = elements.size(); i < count; i++) {
Element div = DOM.createDiv();
elements.add(div);
DOM.appendChild(getElement(), div);
DOM.setInnerHTML(div, " ");
}
// Remove some lines if too many
while (elements.size() > count) {
Element div = (Element) elements.get(0);
elements.remove(div);
DOM.removeChild(getElement(), div);
}
}
}