Java Reference
In-Depth Information
IllegalArgumentException
. Because there can't be a border, the
insets
property setting is always
(0, 0, 0, 0). Instead of displaying a border around the
JViewport
, you can display a border around
the component within the view. Simply place a border around the component, or place the
component inside a
JPanel
with a border before adding it to the
JViewport
. If you do place a
border around the component, the border would be seen only if that part of the component is
visible. If you don't want the border to scroll, you must place the
JViewport
within a component
such as a
JScrollPane
that has its own border.
■
Tip
To set the background color of what appears in the
JScrollPane
, you need to set the background
color of the viewport:
aScrollPane.getViewport().setBackground(newColor)
.
The size of the view (
viewSize
property) is based on the size of the component (
view
property)
within the
JViewport
. The view position (
viewPosition
property) is the upper-left corner of the
view rectangle (
viewRect
property), where the rectangle's size is the extent size (
extentSize
property) of the viewport. If that's confusing, Figure 11-18 should help you see where all these
properties lie within the
JViewport
.
Figure 11-18.
Visualizing JViewport properties
