IconRules

is an option for CloudObject and related objects that specifies icons to use in different environments to represent an object.

Details

	image	a single image to be resized for all icons
	{image₁,image₂,…}	images where an appropriate size is used for all icons
	{"env₁"image,…}	separate settings for different environments

	"Android"	icon to display under Android
	"FileBrowser"	icon to display in the file browser
	"IOS"	icon to display under iOS
	"WebPage"	favicon for a webpage
	All	generic icon to use

The setting for each environment is of the form "env"->image or "env"->{image₁,image₂,…}.
When an icon of a particular size is required, the immediately larger image_i is selected and scaled down to the required size.
Each image can be an explicit Image object, Graphics, or any other expression, which if necessary will be rasterized.
A setting of Automatic for IconRules or for a particular element will generate an icon automatically from the contents of the cloud object.
If a particular element is needed that has not been specified explicitly, it will be interpolated from other elements given.
The setting for IconRules for a cloud object can be changed using SetOptions.

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Icons are generated automatically when creating cloud objects:

View the icons:

The icons appear in the tooltips of some cloud file manager views:

Create a cloud object that shows the current time, with a representative icon:

View the icon:

Change the existing icon:

Expressions without graphics also get automatic icons:

View the icons:

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