6 May 2019

Properties shown in case of multiple selection

When selecting multiple objects in the UI then the behaviour of the Property Palette (i.e. which object's properties the palette is showing) can seem a bit random.

As mentioned here as well, you have access to the source code of the Viewer, so you can find out what it's doing exactly.

Once you find the code part that is run when the selection changes, then you can see it's always selecting the last element from the array of selected items:

Selection Changed event

ViewerPropertyPanel.prototype.requestProperties = function () {
    if (this.isVisible() && this.isDirty) {
        if (this.currentModel && this.currentNodeIds.length > 0) {
            this.setNodeProperties(this.currentNodeIds[this.currentNodeIds.length - 1]);
        } else {
        this.isDirty = false;

The keys in the array that stores info about each selected item are the dbId's of those items. This order is kept when the list of selected objects is requested by other parts of the code. So the dbId's in the array always go from smallest to largest.
In other words, it's always the item with the biggest dbId whose properties are shown in the Property palette - see top picture.


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Adam Nagy

Follow @AdamTheNagy Adam Nagy joined Autodesk back in 2005 and has been providing programming support, consulting, training and evangelism to external developers. He started his career in Budapest, then worked in Prague for 3 years and now lives in South England, UK. At the moment focusing on Inventor and Fusion 360, plus cloud and mobile related technologies. Adam has a degree in Software Engineering and has...