Add fixed positioned Combobox inside FlowPane

问题

I have a FlowPane which will hold many panels which are based on BorderPane.

I want to create ComboBox which will be used to filter the Panels by type. And the panels will be scrolled by ScrollPanewhen they exceed the visible area.

I want the combo box to scroll along with the FlowPane inside the ScrollPane. I want to get the result which is displayed into the picture. Can you tell me how I can get the desired result. I can very easy create BorderPanes and insert them into the FlowPane and the challenge is how to position the Combo Box and keep it always at this position.

回答1:

Why don't you simply use another border pane?

1. Add your combobox to the top ( or additional flow pane with combobox on it)
2. Add your Flowpane to the Center
3. Then scroll the whole border pane using the scrollpane?

What could be simpler?

回答2:

Here's how you'd do it:

StackPane with 2 layers:

• layer1: your ComboBox panel.
• layer2: your ScrollPane with your FlowPane inside*.

*The trick is: just make your combobox panel background opaque, and some initial top inset on the flowpane so that it starts at the right place.

来源：https://stackoverflow.com/questions/18229444/add-fixed-positioned-combobox-inside-flowpane