Is Slot
Introduction
By default, when one instance (such as a NineSlice) is attached to another instance (such as a Container), the child attaches to the root of the parent. However, complex components often have internal structures. For example, a Window may have an InnerPanel which acts as the "landing zone" for children.
Slots allow you to designate specific internal parts of a component as an "attachment point". Any instance in a component can be designated as a slot by checking the Is Slot variable.
Note that instances can be marked as Default Slots for automatic parenting. For more information see the Default Slot page.
Example - Using Is Slot
Setting an instance's Is Slot to true is a way to tell Gum that it should be available as a parent. Any number of instances can be slots.
For example, consider a Component with three children: Header, Body, and Footer. In this case all three instances should be considered slots.
To set the value, select each instance and check Is Slot.
If we have an instance of this HeaderBodyFooterComponent in a screen, then other instances can use any of the slots as their parent value. For example, the following screenshot shows a Text instance's available parents. Notice that all three slots are available.
We can select any of these as the Text's parent.
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