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index.zulzul<zk xmlns:w="client">
<script>
zk.afterLoad("zul.sel",function() {
zul.sel.DragEventTreerow = zk.$extends(zul.sel.Treerow, {
getDragOptions_ : function (map) {
var result = Object.assign({},map);
var self = this, treeUuid = this.getTree().uuid;
var oldstarteffect = result.starteffect;
result.starteffect = function(dg) {
oldstarteffect.apply(this,arguments);
zAu.send(new zk.Event(self, "onStartDrag", {target:self.getDraggable()}, {toServer:true}));
console.log(self.getDraggable());
zAu.cmd0.showBusy(treeUuid,"Calculating drag options, please hold");
}
var oldendeffect = result.endeffect;
result.endeffect = function(dg) {
oldendeffect.apply(this,arguments);
zAu.send(new zk.Event(self, "onEndDrag", {target:self.getDraggable()}, {toServer:true}));
zAu.cmd0.clearBusy(treeUuid);
}
return result;
}
});
});
</script>
<style>
.droppable > .z-treecell {
background-color: green;
}
</style>
<div apply="pkg$.DragEventComposer">
<tree id="myTree">
<template name="model">
<treeitem >
<treerow w:use="zul.sel.DragEventTreerow" forward="onStartDrag=myTree.onStartDrag,onEndDrag=myTree.onEndDrag,onDrop=myTree.onItemDrop" draggable="${each.data}">
<treecell label="${each.data}"/>
</treerow>
</treeitem>
</template>
</tree>
</div>
</zk>DragEventComposer.javajavaimport java.util.Random;
import org.zkoss.json.JSONObject;
import org.zkoss.zk.ui.Component;
import org.zkoss.zk.ui.event.DropEvent;
import org.zkoss.zk.ui.event.ForwardEvent;
import org.zkoss.zk.ui.select.SelectorComposer;
import org.zkoss.zk.ui.select.annotation.Listen;
import org.zkoss.zk.ui.select.annotation.Wire;
import org.zkoss.zk.ui.util.Clients;
import org.zkoss.zul.DefaultTreeModel;
import org.zkoss.zul.DefaultTreeNode;
import org.zkoss.zul.Tree;
import org.zkoss.zul.TreeModel;
public class DragEventComposer extends SelectorComposer<Component> {
@Wire
private Tree myTree;
private TreeModel model;
@Override
public void doAfterCompose(Component comp) throws Exception {
super.doAfterCompose(comp);
TreeModel model = new DefaultTreeModel(
new DefaultTreeNode(null,
new DefaultTreeNode[] {
new DefaultTreeNode("item1"),
new DefaultTreeNode("item2",
new DefaultTreeNode[] {
new DefaultTreeNode("item3",
new DefaultTreeNode[] {
new DefaultTreeNode("item4"),
new DefaultTreeNode("item5")
}),
new DefaultTreeNode("item6"),
new DefaultTreeNode("item7")
})
}
));
myTree.setModel(model);
}
@Listen("onStartDrag=#myTree")
public void doOnStartTreeitemDrag(ForwardEvent evt) throws InterruptedException {
Thread.sleep(500); //simulate delay
String draggableId = (String) ((JSONObject)evt.getOrigin().getData()).get("target"); //retrieve the value of the draggable field on event source
Random random = new Random(); //create randomness for demo purpose
myTree.getItems().forEach(treeitem -> {
if(random.nextBoolean()) {//create randomness for demo purpose
/*should be droppable, put class and set droppable ID*/
treeitem.getTreerow().setDroppable(draggableId);
treeitem.getTreerow().setSclass("droppable");
} else {
/*not droppable, remove droppable status if any, remove class if any*/
treeitem.getTreerow().setDroppable("false");
treeitem.getTreerow().setSclass(null);
}
});
/*ready: remove mask on tree*/
Clients.clearBusy(myTree);
}
@Listen("onEndDrag=#myTree")
public void doOnEndTreeitemDrag(ForwardEvent evt) throws InterruptedException {
/*either drop complete, or user let go before drop. remove all droppable, all drop class, and processing mask if any*/
myTree.getItems().forEach(treeitem -> {
treeitem.getTreerow().setDroppable("false");
treeitem.getTreerow().setSclass(null);
});
Clients.clearBusy(myTree);
}
@Listen("onItemDrop=#myTree")
public void doItemDrop(ForwardEvent event) {
Clients.log("dropped" + ((DropEvent)event.getOrigin()).getTarget());
}
}