java.lang.Object
javax.swing.plaf.ComponentUI
javax.swing.plaf.ScrollPaneUI
javax.swing.plaf.basic.BasicScrollPaneUI
- All Implemented Interfaces:
ScrollPaneConstants
- Direct Known Subclasses:
MetalScrollPaneUI
,SynthScrollPaneUI
A default L&F implementation of ScrollPaneUI.
-
Nested Class Summary
Modifier and TypeClassDescriptionclass
Deprecated, for removal: This API element is subject to removal in a future version.protected class
MouseWheelHandler is an inner class which implements the MouseWheelListener interface.class
Deprecated, for removal: This API element is subject to removal in a future version.class
Deprecated, for removal: This API element is subject to removal in a future version.class
Deprecated, for removal: This API element is subject to removal in a future version. -
Field Summary
Modifier and TypeFieldDescriptionprotected ChangeListener
ChangeListener
installed on the horizontal scrollbar.protected JScrollPane
The instance ofJScrollPane
.protected PropertyChangeListener
PropertyChangeListener
installed on the scroll pane.protected ChangeListener
ChangeListener
installed on the viewport.protected ChangeListener
ChangeListener
installed on the vertical scrollbar.Fields declared in interface javax.swing.ScrollPaneConstants
COLUMN_HEADER, HORIZONTAL_SCROLLBAR, HORIZONTAL_SCROLLBAR_ALWAYS, HORIZONTAL_SCROLLBAR_AS_NEEDED, HORIZONTAL_SCROLLBAR_NEVER, HORIZONTAL_SCROLLBAR_POLICY, LOWER_LEADING_CORNER, LOWER_LEFT_CORNER, LOWER_RIGHT_CORNER, LOWER_TRAILING_CORNER, ROW_HEADER, UPPER_LEADING_CORNER, UPPER_LEFT_CORNER, UPPER_RIGHT_CORNER, UPPER_TRAILING_CORNER, VERTICAL_SCROLLBAR, VERTICAL_SCROLLBAR_ALWAYS, VERTICAL_SCROLLBAR_AS_NEEDED, VERTICAL_SCROLLBAR_NEVER, VERTICAL_SCROLLBAR_POLICY, VIEWPORT
-
Constructor Summary
-
Method Summary
Modifier and TypeMethodDescriptionprotected ChangeListener
Returns an instance of horizontal scroll barChangeListener
.protected MouseWheelListener
Creates an instance of MouseWheelListener, which is added to the JScrollPane by installUI().protected PropertyChangeListener
Creates an instance ofPropertyChangeListener
that's added to theJScrollPane
byinstallUI()
.static ComponentUI
Returns a new instance ofBasicScrollPaneUI
.protected ChangeListener
Returns an instance of viewportChangeListener
.protected ChangeListener
Returns an instance of vertical scroll barChangeListener
.int
getBaseline
(JComponent c, int width, int height) Returns the baseline.Returns an enum indicating how the baseline of the component changes as the size changes.Returns the specified component's maximum size appropriate for the look and feel.protected void
installDefaults
(JScrollPane scrollpane) Installs default properties.protected void
Registers keyboard actions.protected void
Registers listeners.protected void
Synchronizes theJScrollPane
withViewport
.protected void
Uninstalls default properties.protected void
Unregisters keyboard actions.protected void
Unregisters listeners.protected void
Updates column header.protected void
Updates row header.protected void
Updates a scroll bar display policy.protected void
Updates viewport.Methods declared in class javax.swing.plaf.ComponentUI
contains, getAccessibleChild, getAccessibleChildrenCount, getMinimumSize, getPreferredSize, installUI, paint, uninstallUI, update
-
Field Details
-
scrollpane
The instance ofJScrollPane
. -
vsbChangeListener
ChangeListener
installed on the vertical scrollbar. -
hsbChangeListener
ChangeListener
installed on the horizontal scrollbar. -
viewportChangeListener
ChangeListener
installed on the viewport. -
spPropertyChangeListener
PropertyChangeListener
installed on the scroll pane.
-
-
Constructor Details
-
BasicScrollPaneUI
public BasicScrollPaneUI()Constructs aBasicScrollPaneUI
.
-
-
Method Details
-
createUI
Returns a new instance ofBasicScrollPaneUI
.- Parameters:
x
- a component.- Returns:
- a new instance of
BasicScrollPaneUI
-
getMaximumSize
Description copied from class:ComponentUI
Returns the specified component's maximum size appropriate for the look and feel. Ifnull
is returned, the maximum size will be calculated by the component's layout manager instead (this is the preferred approach for any component with a specific layout manager installed). The default implementation of this method invokesgetPreferredSize
and returns that value.- Overrides:
getMaximumSize
in classComponentUI
- Parameters:
c
- the component whose maximum size is being queried; this argument is often ignored, but might be used if the UI object is stateless and shared by multiple components- Returns:
- new Dimension(Short.MAX_VALUE, Short.MAX_VALUE)
- See Also:
-
installDefaults
Installs default properties.- Parameters:
scrollpane
- an instance ofJScrollPane
-
installListeners
Registers listeners.- Parameters:
c
- an instance ofJScrollPane
-
installKeyboardActions
Registers keyboard actions.- Parameters:
c
- an instance ofJScrollPane
-
uninstallDefaults
Uninstalls default properties.- Parameters:
c
- an instance ofJScrollPane
-
uninstallListeners
Unregisters listeners.- Parameters:
c
- a component
-
uninstallKeyboardActions
Unregisters keyboard actions.- Parameters:
c
- an instance ofJScrollPane
-
syncScrollPaneWithViewport
protected void syncScrollPaneWithViewport()Synchronizes theJScrollPane
withViewport
. -
getBaseline
Returns the baseline.- Overrides:
getBaseline
in classComponentUI
- Parameters:
c
-JComponent
baseline is being requested forwidth
- the width to get the baseline forheight
- the height to get the baseline for- Returns:
- baseline or a value < 0 indicating there is no reasonable baseline
- Throws:
NullPointerException
- ifc
isnull
IllegalArgumentException
- if width or height is < 0- Since:
- 1.6
- See Also:
-
getBaselineResizeBehavior
Returns an enum indicating how the baseline of the component changes as the size changes.- Overrides:
getBaselineResizeBehavior
in classComponentUI
- Parameters:
c
-JComponent
to return baseline resize behavior for- Returns:
- an enum indicating how the baseline changes as the component size changes
- Throws:
NullPointerException
- ifc
isnull
- Since:
- 1.6
- See Also:
-
createViewportChangeListener
Returns an instance of viewportChangeListener
.- Returns:
- an instance of viewport
ChangeListener
-
createHSBChangeListener
Returns an instance of horizontal scroll barChangeListener
.- Returns:
- an instance of horizontal scroll bar
ChangeListener
-
createVSBChangeListener
Returns an instance of vertical scroll barChangeListener
.- Returns:
- an instance of vertical scroll bar
ChangeListener
-
createMouseWheelListener
Creates an instance of MouseWheelListener, which is added to the JScrollPane by installUI(). The returned MouseWheelListener is used to handle mouse wheel-driven scrolling.- Returns:
- MouseWheelListener which implements wheel-driven scrolling
- Since:
- 1.4
- See Also:
-
updateScrollBarDisplayPolicy
Updates a scroll bar display policy.- Parameters:
e
- the property change event
-
updateViewport
Updates viewport.- Parameters:
e
- the property change event
-
updateRowHeader
Updates row header.- Parameters:
e
- the property change event
-
updateColumnHeader
Updates column header.- Parameters:
e
- the property change event
-
createPropertyChangeListener
Creates an instance ofPropertyChangeListener
that's added to theJScrollPane
byinstallUI()
. Subclasses can override this method to return a customPropertyChangeListener
, e.g.class MyScrollPaneUI extends BasicScrollPaneUI { protected PropertyChangeListener createPropertyChangeListener() { return new MyPropertyChangeListener(); } public class MyPropertyChangeListener extends PropertyChangeListener { public void propertyChange(PropertyChangeEvent e) { if (e.getPropertyName().equals("viewport")) { // do some extra work when the viewport changes } super.propertyChange(e); } } }
- Returns:
- an instance of
PropertyChangeListener
- See Also:
-