tornadofx-guide

5. Data Controls
This more closely resembles the traditional setCellValueFactory() for the JavaFX
TableColumn .
Row Expanders
Later we will learn about the TreeTableView which has a notion of "parent" and "child" rows,
but the constraint with this control is the parent and child must have the same columns.
Fortunately, TornadoFX comes with an awesome utility to not only reveal a "child table" for a
given row, but any kind of Node control.
Say we have two domain types: Region and Branch . A Region is a geographical zone,
and it contains one or more Branch items which are specific business operation locations
(warehouses, distribution centers, etc). Here is a declaration of these types and some given
instances.
class Region(val id: Int, val name: String, val country: String, val branches: Observa
bleList)
class Branch(val id: Int, val facilityCode: String, val city: String, val stateProvince
: String)
val regions = listOf(
Region(1,"Pacific Northwest", "USA",listOf(
Branch(1,"D","Seattle","WA"),
Branch(2,"W","Portland","OR")
).observable()),
Region(2,"Alberta", "Canada",listOf(
Branch(3,"W","Calgary","AB")
).observable()),
Region(3,"Midwest", "USA", listOf(
Branch(4,"D","Chicago","IL"),
Branch(5,"D","Frankfort","KY"),
Branch(6, "W","Indianapolis", "IN")
).observable())
).observable()
We can create a TableView where each row has a rowExpander() function defined, and
there we can arbitrarily create any Node control built off that particular row's item. In this
case, we can nest another TableView for a given Region to show all the Branch items
belonging to it. It will have a "+" button column to expand and show this expanded control
(Figure 5.5).
Figure 5.5
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