Zoom the Diagram on Ctrl Keypress Only
Environment
| Product | Progress® Kendo UI® Diagram for jQuery |
| Operating System | Windows 10 64bit |
| Visual Studio Version | Visual Studio 2017 |
| Preferred Language | JavaScript |
Description
How can I allow zooming in and out the Kendo UI for jQuery Diagram only through pressing the Ctrl key?
Solution
The following example demonstrates how to set up the Diagram to allow zooming in and out only when the Ctrl key is pressed.
<div style="overflow:auto; width: 1000px; height: 300px;">
<div id="diagram"></div>
</div>
<script>
$("#diagram").kendoDiagram({
dataSource: new kendo.data.HierarchicalDataSource({
data: diagramNodes()
}),
layout: {
type: "tree",
horizontalSeparation: 30,
verticalSeparation: 20
},
shapeDefaults: {
width: 40,
height: 40
},
zoomStart: function(ev) {
if (!ev.meta.ctrlKey) {
ev.preventDefault(true);
}
}
});
function diagramNodes() {
var root = { name: "0", items: [] };
addNodes(root, [3, 3, 3, 3]);
return [root];
}
function addNodes(root, levels) {
if (levels.length > 0) {
for (var i = 0; i < levels[0]; i++) {
var node = { name: "0", items: [] };
root.items.push(node);
addNodes(node, levels.slice(1));
}
}
}
</script>