Drag Tracker Sample (Smart GWT)
/*
* SmartGWT (GWT for SmartClient)
* Copyright 2008 and beyond, Isomorphic Software, Inc.
*
* SmartGWT is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License version 3
* as published by the Free Software Foundation. SmartGWT is also
* available under typical commercial license terms - see
* http://smartclient.com/license
* This software 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
* Lesser General Public License for more details.
*/
package com.smartgwt.sample.showcase.client;
import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.user.client.ui.RootPanel;
import com.smartgwt.client.types.Alignment;
import com.smartgwt.client.types.DragAppearance;
import com.smartgwt.client.util.EventHandler;
import com.smartgwt.client.util.SC;
import com.smartgwt.client.widgets.Canvas;
import com.smartgwt.client.widgets.Img;
import com.smartgwt.client.widgets.Label;
import com.smartgwt.client.widgets.events.DropEvent;
import com.smartgwt.client.widgets.events.DropHandler;
import com.smartgwt.client.widgets.events.DropOutEvent;
import com.smartgwt.client.widgets.events.DropOutHandler;
import com.smartgwt.client.widgets.events.DropOverEvent;
import com.smartgwt.client.widgets.events.DropOverHandler;
public class Showcase implements EntryPoint {
public void onModuleLoad() {
RootPanel.get().add(getViewPanel());
}
public Canvas getViewPanel() {
DragPiece blue = new DragPiece("pawn_blue.png") {
protected boolean setDragTracker() {
EventHandler.setDragTracker("Blue Piece");
return false;
}
};
blue.setID("bluePiece");
blue.setTitle("Blue Piece");
blue.setLeft(50);
blue.setTop(50);
DragPiece green = new DragPiece("pawn_green.png"){
protected boolean setDragTracker() {
String html = Canvas.imgHTML("pieces/24/pawn_green.png", 24, 24);
EventHandler.setDragTracker(html);
return false;
}
};
green.setID("greenPiece");
green.setTitle("Green Piece");
green.setLeft(150);
green.setTop(50);
final Label label = new Label("Drop Here");
label.setLeft(250);
label.setTop(50);
label.setShowEdges(true);
label.setAlign(Alignment.CENTER);
label.setCanAcceptDrop(true);
label.addDropOverHandler(new DropOverHandler() {
public void onDropOver(DropOverEvent event) {
label.setBackgroundColor("#ffff80");
}
});
label.addDropOutHandler(new DropOutHandler() {
public void onDropOut(DropOutEvent event) {
label.setBackgroundColor("#ffffff");
}
});
label.addDropHandler(new DropHandler() {
public void onDrop(DropEvent event) {
Canvas target = EventHandler.getDragTarget();
SC.say("You dropped the " + target.getID());
}
});
Canvas canvas = new Canvas();
canvas.addChild(blue);
canvas.addChild(green);
canvas.addChild(label);
return canvas;
}
private class DragPiece extends Img {
public DragPiece() {
setWidth(48);
setHeight(48);
setCanDrop(true);
setCanDrag(true);
setDragAppearance(DragAppearance.TRACKER);
setAppImgDir("pieces/48/");
}
public DragPiece(String src) {
this();
super.setSrc(src);
}
}
}
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