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1guest70.52.248.1582th9rkeFeb 8, 2016 2:39:07 PMlinkresources
index.zulzul <!-- ======================= -->
<!-- @author benbai -->
<!-- Sample taken from: http://forum.zkoss.org/question/72902/how-to-auto-scroll-a-listbox-when-dragging-a-listtiem/?answer=88683#post-id-88683 -->
<!-- ======================= -->
<zk>
<script><![CDATA[
zk.afterLoad("zul.sel", function () {
var _tWgt = {},
_tiWgt = {};
zk.override(zul.sel.Treeitem.prototype, _tiWgt, {
getDragOptions_: function (map) {
var copy = map.constructor(),
wgt = this;
// clone map
for (var attr in map) {
if (map.hasOwnProperty(attr)) copy[attr] = map[attr];
}
// change functions as needed
var oldChange = copy.change,
oldEnd = copy.endeffect;
copy.change = function (drag, pt, evt) {
var tree = wgt.getTree();
oldChange(drag, pt, evt);
tree.triggerAutoScroll(evt.pageX, evt.pageY);
};
copy.endeffect = function (drag, evt) {
var tree = wgt.getTree();
oldEnd(drag, evt);
tree.stopAutoScroll();
}
return copy;
}
});
zk.override(zul.sel.Tree.prototype, _tWgt, {
scrollValue: 20,
scrollDelay: 20,
triggerAutoScroll: function (x, y) {
var $n = jq(this.$n()),
offset = $n.offset(),
top = offset.top + (this.$n('head')? 30 : 0),
bottom = $n.outerHeight(true);
if (y < top)
this.startScrollToTop();
else if (y > bottom)
this.startScrollToBottom();
else
this.stopAutoScroll();
},
stopAutoScroll: function () {
this.clearScrollToTopTimer();
this.clearScrollToBottomTimer();
},
startScrollToTop: function () {
var wgt = this;
this.clearScrollToBottomTimer();
if (!this._scrollToTopTimer) {
this._scrollToTopTimer = setInterval(function () {
wgt.$n('body').scrollTop -= wgt.scrollValue;
}, this.scrollDelay);
}
},
startScrollToBottom: function () {
var wgt = this;
this.clearScrollToTopTimer();
if (!this._scrollToBottomTimer) {
this._scrollToBottomTimer = setInterval(function () {
wgt.$n('body').scrollTop += wgt.scrollValue;
}, this.scrollDelay);
}
},
clearScrollToTopTimer: function () {
var timer = this._scrollToTopTimer;
if (timer)
clearInterval(timer);
this._scrollToTopTimer = null;
},
clearScrollToBottomTimer: function () {
var timer = this._scrollToBottomTimer;
if (timer)
clearInterval(timer);
this._scrollToBottomTimer = null;
}
});
});
]]></script>
<window apply="org.zkoss.bind.BindComposer" viewModel="@id('vm') @init('pkg$.TestVM')">
<label value='To test: Drag an item across the tree borders to scroll up and down...' />
<tree id="tree" model="@bind(vm.model)"
onAfterRender="self.getTreechildren().getFirstChild().setOpen(true)"
width="600px" height="300px">
<treecols>
<treecol label="data" />
</treecols>
<template name="model" var="node">
<treeitem draggable="true" droppable="true">
<treerow>
<treecell label="@bind(node.data)" />
</treerow>
</treeitem>
</template>
</tree>
</window>
</zk>TestVM.javajavaimport java.io.File;
import java.util.ArrayList;
import java.util.List;
import org.zkoss.zul.DefaultTreeModel;
import org.zkoss.zul.DefaultTreeNode;
import org.zkoss.zul.TreeModel;
/**
* tested with ZK 6.5.3
*
* @author benbai
*
*/
@SuppressWarnings({ "rawtypes", "unchecked" })
public class TestVM {
File file = new File("C:" + File.separator + "Program Files");
DefaultTreeModel _model;
DefaultTreeNode _selectedNode;
String _valueToAdd;
String _valueToUpdate;
public TreeModel<DefaultTreeNode<String>> getModel () {
List<DefaultTreeNode> l = new ArrayList<DefaultTreeNode>();
for (int i = 0; i < 300; i++) {
l.add(new DefaultTreeNode("chile " + i, (List)null));
}
DefaultTreeNode root = new DefaultTreeNode(null,
new DefaultTreeNode[] {new DefaultTreeNode("aaa", l)
});
if (_model == null) {
_model = new DefaultTreeModel<String>(root);
}
return _model;
}
}