Suggested case list:
Using timer to refresh a grid
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28guest172.70.246.67vroi36Jan 10, 2025 3:37:54 PMlinkListbox auto scroll while dragging
2benbai61.224.43.1931c267mkJan 24, 2012 12:35:17 AMlinkresources
index.zulzul<zk>
<script type="text/javascript"><![CDATA[
var oldUpdateDrag = zk.Draggable.prototype._updateDrag;
zk.afterLoad("zk", function () {
zk.Draggable.prototype._updateDrag = function (pt, evt) {
// call original _updateDrag method
oldUpdateDrag.apply(this, arguments);
var node = this.node; // cloned listitem, the drag node
if (this.control.$instanceof(zul.sel.Listitem)) {
// get original listbox
var $node = jq(node),
listbox = getEffectListbox($node),
dir;
// start scroll if has a direction,
// or clear the scroll timer
if (dir = shouldScroll($node, jq(listbox)))
startScroll(dir, listbox);
else
clearScroll(listbox);
}
}
});
// return the scroll direction if have to scroll,
// return null otherwise.
function shouldScroll ($node, $listbox) {
var top = $listbox.offset().top,
itemTop = $node.offset().top;
if (itemTop < top)
return 'up';
else {
var bottom = top + $listbox.height(),
itemBottom = itemTop + $node.height();
return itemBottom > bottom? 'down' : null;
}
}
// create scroll timer with the specified direction
function startScroll (dir, listbox) {
if (!listbox._scrollStarted)
listbox._scrollStarted = setInterval(function () {
var body = listbox.$n('body'),
oldValue = body.scrollTop;
body.scrollTop += dir == 'down'? 20 : (-20);
// can not scroll any more
if (body.scrollTop == oldValue)
clearScroll(listbox);
}, 50);
}
// clear scroll timer
function clearScroll(listbox) {
if (listbox._scrollStarted) {
clearInterval(listbox._scrollStarted);
listbox._scrollStarted = null;
}
}
function getEffectListbox($node) {
var left = $node.offset().left,
$lbOne = jq('$lbOne'); // get root element of listbox by assigned ID
if (left < $lbOne.offset().left + $lbOne.width()) {
// get the zk widgeth by its root element
// clear the scroll of another listbox first
clearScroll(zk.Widget.$(jq('$lbTwo')[0]));
return zk.Widget.$($lbOne[0]);
}
clearScroll(zk.Widget.$(jq('$lbOne')[0]));
return zk.Widget.$(jq('$lbTwo')[0]);
}
]]></script>
<div height="15px" />
<hbox>
<listbox id="lbOne" height="120px" width="200px" droppable="true">
<listitem draggable="true" droppable="true">
<listcell label="Item 1" />
</listitem>
<listitem draggable="true" droppable="true">
<listcell label="Item 2" />
</listitem>
<listitem draggable="true" droppable="true">
<listcell label="Item 3" />
</listitem>
<listitem draggable="true" droppable="true">
<listcell label="Item 4" />
</listitem>
<listitem draggable="true" droppable="true">
<listcell label="Item 5" />
</listitem>
<listitem draggable="true" droppable="true">
<listcell label="Item 6" />
</listitem>
<listitem draggable="true" droppable="true">
<listcell label="Item 7" />
</listitem>
<listitem draggable="true" droppable="true">
<listcell label="Item 8" />
</listitem>
<listitem draggable="true" droppable="true">
<listcell label="Item 9" />
</listitem>
<listitem draggable="true" droppable="true">
<listcell label="Item 10" />
</listitem>
<listitem draggable="true" droppable="true">
<listcell label="Item 11" />
</listitem>
<listitem draggable="true" droppable="true">
<listcell label="Item 12" />
</listitem>
<listitem draggable="true" droppable="true">
<listcell label="Item 13" />
</listitem>
<listitem draggable="true" droppable="true">
<listcell label="Item 14" />
</listitem>
<listitem draggable="true" droppable="true">
<listcell label="Item 15" />
</listitem>
</listbox>
<listbox id="lbTwo" height="120px" width="200px" droppable="true">
<listitem draggable="true" droppable="true">
<listcell label="Item 1" />
</listitem>
<listitem draggable="true" droppable="true">
<listcell label="Item 2" />
</listitem>
<listitem draggable="true" droppable="true">
<listcell label="Item 3" />
</listitem>
<listitem draggable="true" droppable="true">
<listcell label="Item 4" />
</listitem>
<listitem draggable="true" droppable="true">
<listcell label="Item 5" />
</listitem>
<listitem draggable="true" droppable="true">
<listcell label="Item 6" />
</listitem>
<listitem draggable="true" droppable="true">
<listcell label="Item 7" />
</listitem>
<listitem draggable="true" droppable="true">
<listcell label="Item 8" />
</listitem>
<listitem draggable="true" droppable="true">
<listcell label="Item 9" />
</listitem>
<listitem draggable="true" droppable="true">
<listcell label="Item 10" />
</listitem>
<listitem draggable="true" droppable="true">
<listcell label="Item 11" />
</listitem>
<listitem draggable="true" droppable="true">
<listcell label="Item 12" />
</listitem>
<listitem draggable="true" droppable="true">
<listcell label="Item 13" />
</listitem>
<listitem draggable="true" droppable="true">
<listcell label="Item 14" />
</listitem>
<listitem draggable="true" droppable="true">
<listcell label="Item 15" />
</listitem>
</listbox>
</hbox>
</zk>