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1guest172.70.206.932sjf6ooApr 26, 2022 10:48:35 AMlinkresources
index.zulzul<zk>
<script><![CDATA[
zk.afterLoad("zul.sel", function () {
var _xTree = {};
zk.override(zul.sel.Tree.prototype, _xTree, {
_getFirstItemIndex: function () {
var firstIndex = null, self=this;
this.treechildren.getItems().forEach(function(item, index){
if(item.$n() == self.treechildren.$n().firstChild){
firstIndex = index;
}
});
return firstIndex;
},
_getLastItemIndex: function () {
var lastIndex = null, self=this;
this.treechildren.getItems().forEach(function(item, index){
if(item.$n() == self.treechildren.$n().lastChild){
lastIndex = index;
}
});
return lastIndex;
},
_getItemIndex: function (searchedItem) {
var thisIndex = null, self=this;
this.treechildren.getItems().forEach(function(item, index){
if(item.$n() == searchedItem.$n()){
thisIndex = index;
}
});
return thisIndex;
},
_scrollToIndex: function (index, scrollRatio) {
var self=this,
firstItemIndex = this._getFirstItemIndex(),
lastItemIndex = this._getLastItemIndex(),
body = this.ebody;
this._targetIndex = index;
this._keepScroll = true;
if (index >= firstItemIndex && index <= lastItemIndex) {
//var itemIterator = this.getBodyWidgetIterator();
var renderedChildren = this.treechildren.$n().children,
shallReturn = false;
Array.from(renderedChildren).forEach(function(renderedItem, renderedIndex){
if (self.getItems()[index].$n() == renderedItem) {
renderedItem.scrollIntoView(true);
self._keepScroll = false;
self._topBoundary = self._bottomBoundary = undefined;
}
});
if(shallReturn){
return;
}
} else if (scrollRatio != undefined) {
body.scrollTop = body.scrollHeight * scrollRatio;
} else if (index < firstItemIndex) {
this._bottomBoundary = body.scrollTop;
this._topBoundary = this._topBoundary == undefined ? 0 : this._topBoundary;
body.scrollTop -= (body.scrollTop - this._topBoundary) / 2;
} else if (index > lastItemIndex) {
this._topBoundary = body.scrollTop;
this._bottomBoundary = this._bottomBoundary == undefined ? body.scrollHeight : this._bottomBoundary;
body.scrollTop += (this._bottomBoundary - body.scrollTop) / 2;
}
var self = this, selfArgs = arguments;
if(this._keepScroll){
setTimeout(function(){
self._scrollToIndex.apply(self, selfArgs);
},300);
}
}
});
var _xTreeitem = {};
zk.override(zul.sel.Treeitem.prototype, _xTreeitem, {
scrollIntoView: function() {
var self = this;
var result = _xTreeitem.scrollIntoView.apply(this, arguments);
this.getTree()._scrollToIndex(this.getTree().getItems().indexOf(this));
return result;
},
getMeshWidget: function(){
return this.getTree();
}
});
});
]]></script>
<window border="normal" apply="pkg$.TestComposer" height="300px" width="300px">
<div>This is an example of Clients.scrollIntoView not working on trees with many items when render on demand is activated</div>
<button id="btnNine" label="Scroll to nine" />
<button id="btnLast" label="Scroll to last" />
<tree id="tree" vflex="1">
<!-- <custom-attributes org.zkoss.zul.client.rod="false"/> -->
</tree>
</window>
</zk>
TestComposer.javajavaimport java.util.List;
import java.util.ArrayList;
import org.zkoss.zul.DefaultTreeNode;
import org.zkoss.zk.ui.*;
import org.zkoss.zk.ui.event.*;
import org.zkoss.zk.ui.util.*;
import org.zkoss.zk.ui.ext.*;
import org.zkoss.zk.au.*;
import org.zkoss.zk.au.out.*;
import org.zkoss.zul.*;
import org.zkoss.bind.annotation.Init;
import org.zkoss.zk.ui.select.annotation.Listen;
import org.zkoss.zk.ui.select.annotation.Wire;
import org.zkoss.bind.annotation.Command;
public class TestComposer extends GenericForwardComposer{
@Wire
private Tree tree;
public void doAfterCompose(Component comp) throws Exception {
super.doAfterCompose(comp);
List<DefaultTreeNode> list = new ArrayList<DefaultTreeNode>();
for(int i = 0; i < 100; i++) {
list.add(new DefaultTreeNode(i));
}
tree.setModel(new DefaultTreeModel(new DefaultTreeNode("ROOT", list)));
tree.invalidate();
}
public void onClick$btnNine() {
Treeitem[] items = tree.getItems().toArray(new Treeitem[0]);
Clients.scrollIntoView(items[9]);
}
public void onClick$btnLast() {
Treeitem[] items = tree.getItems().toArray(new Treeitem[0]);
Clients.scrollIntoView(items[items.length - 1]);
}
}