java.lang.Object
javax.swing.plaf.ComponentUI
javax.swing.plaf.LabelUI
javax.swing.plaf.basic.BasicLabelUI
- All Implemented Interfaces:
PropertyChangeListener
,EventListener
- Direct Known Subclasses:
MetalLabelUI
,SynthLabelUI
A Windows L&F implementation of LabelUI. This implementation
is completely static, i.e. there's only one UIView implementation
that's shared by all JLabel objects.
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Field Summary
Modifier and TypeFieldDescriptionprotected static BasicLabelUI
The defaultBasicLabelUI
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Constructor Summary
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Method Summary
Modifier and TypeMethodDescriptionstatic ComponentUI
Returns an instance ofBasicLabelUI
.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.Returns the specified component's minimum size appropriate for the look and feel.protected void
Registers components.protected void
Installs default properties.protected void
Registers keyboard actions.protected void
Registers listeners.protected String
layoutCL
(JLabel label, FontMetrics fontMetrics, String text, Icon icon, Rectangle viewR, Rectangle iconR, Rectangle textR) Forwards the call to SwingUtilities.layoutCompoundLabel().void
paint
(Graphics g, JComponent c) Paints the label text with the foreground color, if the label is opaque then paints the entire background with the background color.protected void
paintDisabledText
(JLabel l, Graphics g, String s, int textX, int textY) Paint clippedText at textX, textY with background.lighter() and then shifted down and to the right by one pixel with background.darker().protected void
paintEnabledText
(JLabel l, Graphics g, String s, int textX, int textY) Paint clippedText at textX, textY with the labels foreground color.void
This method gets called when a bound property is changed.protected void
Unregisters components.protected void
Uninstalls default properties.protected void
Unregisters keyboard actions.protected void
Unregisters listeners.Methods declared in class javax.swing.plaf.ComponentUI
contains, getAccessibleChild, getAccessibleChildrenCount, getPreferredSize, installUI, uninstallUI, update
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Field Details
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labelUI
The defaultBasicLabelUI
instance. This field might not be used. To change the default instance use a subclass which overrides thecreateUI
method, and place that class name in defaults table under the key "LabelUI".
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Constructor Details
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BasicLabelUI
public BasicLabelUI()Constructs aBasicLabelUI
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Method Details
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layoutCL
protected String layoutCL(JLabel label, FontMetrics fontMetrics, String text, Icon icon, Rectangle viewR, Rectangle iconR, Rectangle textR) Forwards the call to SwingUtilities.layoutCompoundLabel(). This method is here so that a subclass could do Label specific layout and to shorten the method name a little.- Parameters:
label
- an instance ofJLabel
fontMetrics
- a font metricstext
- a texticon
- an iconviewR
- a bounding rectangle to lay out labeliconR
- a bounding rectangle to lay out icontextR
- a bounding rectangle to lay out text- Returns:
- a possibly clipped version of the compound labels string
- See Also:
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paintEnabledText
Paint clippedText at textX, textY with the labels foreground color.- Parameters:
l
- an instance ofJLabel
g
- an instance ofGraphics
s
- a texttextX
- an X coordinatetextY
- an Y coordinate- See Also:
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paintDisabledText
Paint clippedText at textX, textY with background.lighter() and then shifted down and to the right by one pixel with background.darker().- Parameters:
l
- an instance ofJLabel
g
- an instance ofGraphics
s
- a texttextX
- an X coordinatetextY
- an Y coordinate- See Also:
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paint
Paints the label text with the foreground color, if the label is opaque then paints the entire background with the background color. The Label text is drawn bypaintEnabledText(javax.swing.JLabel, java.awt.Graphics, java.lang.String, int, int)
orpaintDisabledText(javax.swing.JLabel, java.awt.Graphics, java.lang.String, int, int)
. The locations of the label parts are computed bylayoutCL(javax.swing.JLabel, java.awt.FontMetrics, java.lang.String, javax.swing.Icon, java.awt.Rectangle, java.awt.Rectangle, java.awt.Rectangle)
.- Overrides:
paint
in classComponentUI
- Parameters:
g
- theGraphics
context in which to paintc
- the component being painted; this argument is often ignored, but might be used if the UI object is stateless and shared by multiple components- See Also:
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getMinimumSize
Description copied from class:ComponentUI
Returns the specified component's minimum size appropriate for the look and feel. Ifnull
is returned, the minimum 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:
getMinimumSize
in classComponentUI
- Parameters:
c
- the component whose minimum 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:
- getPreferredSize(c)
- See Also:
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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:
- getPreferredSize(c)
- See Also:
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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:
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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:
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installDefaults
Installs default properties.- Parameters:
c
- an instance ofJLabel
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installListeners
Registers listeners.- Parameters:
c
- an instance ofJLabel
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installComponents
Registers components.- Parameters:
c
- an instance ofJLabel
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installKeyboardActions
Registers keyboard actions.- Parameters:
l
- an instance ofJLabel
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uninstallDefaults
Uninstalls default properties.- Parameters:
c
- an instance ofJLabel
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uninstallListeners
Unregisters listeners.- Parameters:
c
- an instance ofJLabel
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uninstallComponents
Unregisters components.- Parameters:
c
- an instance ofJLabel
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uninstallKeyboardActions
Unregisters keyboard actions.- Parameters:
c
- an instance ofJLabel
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createUI
Returns an instance ofBasicLabelUI
.- Parameters:
c
- a component- Returns:
- an instance of
BasicLabelUI
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propertyChange
Description copied from interface:PropertyChangeListener
This method gets called when a bound property is changed.- Specified by:
propertyChange
in interfacePropertyChangeListener
- Parameters:
e
- A PropertyChangeEvent object describing the event source and the property that has changed.
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