uk.ac.starlink.util.gui

Class ConstrainedViewportLayout

java.lang.Object

javax.swing.ViewportLayout

uk.ac.starlink.util.gui.ConstrainedViewportLayout

All Implemented Interfaces:

LayoutManager, Serializable

public class ConstrainedViewportLayout
extends ViewportLayout

This is a tweaked ViewportLayout implementation to work round an issue with scrollbar positioning.

The problem arises when you have scrollbar policies VERTICAL_SCROLLBAR_AS_NEEDED and HORIZONTAL_SCROLLBAR_NEVER. When the vertical scrollbar appears, it is not accounted for in the preferred size of the scrollpane component. This can, depending on the parent layout, lead to the right hand side of the view component being obscured by the scrollbar.

You can apparently work round the problem with this class, by doing

    scrollPane.getViewport().setLayout(new ConstraintedViewportLayout());
 

I found this solution at stack overflow. I don't really understand why it works.

Since:

27 Nov 2017

Author:

Mark Taylor, https://stackoverflow.com/users/463018/meyertee

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
ConstrainedViewportLayout()

Method Summary

Modifier and Type	Method and Description
Dimension	preferredLayoutSize(Container parent)

Methods inherited from class javax.swing.ViewportLayout

addLayoutComponent, layoutContainer, minimumLayoutSize, removeLayoutComponent

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ConstrainedViewportLayout

public ConstrainedViewportLayout()

Method Detail

preferredLayoutSize

public Dimension preferredLayoutSize(Container parent)

Specified by:

preferredLayoutSize in interface LayoutManager

Overrides:

preferredLayoutSize in class ViewportLayout