Class BasicSliderUI

• java.lang.Object
• • javax.swing.plaf.ComponentUI
  • • javax.swing.plaf.SliderUI
    • • javax.swing.plaf.basic.BasicSliderUI

Direct Known Subclasses:

MetalSliderUI, SynthSliderUI

public class BasicSliderUI
extends SliderUI

A Basic L&F implementation of SliderUI.

Nested Classes

Nested Classes

Modifier and Type	Class and Description
class	BasicSliderUI.ActionScroller As of Java 2 platform v1.3 this undocumented class is no longer used.
class	BasicSliderUI.ChangeHandler Data model listener.
class	BasicSliderUI.ComponentHandler Listener for resizing events.
class	BasicSliderUI.FocusHandler Focus-change listener.
class	BasicSliderUI.PropertyChangeHandler
class	BasicSliderUI.ScrollListener Scroll-event listener.
class	BasicSliderUI.TrackListener Track mouse movements.

Fields

POSITIVE_SCROLL

public static final int POSITIVE_SCROLL

NEGATIVE_SCROLL

public static final int NEGATIVE_SCROLL

MIN_SCROLL

public static final int MIN_SCROLL

MAX_SCROLL

public static final int MAX_SCROLL

scrollTimer

protected Timer scrollTimer

slider

protected JSlider slider

focusInsets

protected Insets focusInsets

insetCache

protected Insets insetCache

leftToRightCache

protected boolean leftToRightCache

focusRect

protected Rectangle focusRect

contentRect

protected Rectangle contentRect

labelRect

protected Rectangle labelRect

tickRect

protected Rectangle tickRect

trackRect

protected Rectangle trackRect

thumbRect

protected Rectangle thumbRect

trackBuffer

protected int trackBuffer

trackListener

protected BasicSliderUI.TrackListener trackListener

changeListener

protected ChangeListener changeListener

componentListener

protected ComponentListener componentListener

focusListener

protected FocusListener focusListener

scrollListener

protected BasicSliderUI.ScrollListener scrollListener

propertyChangeListener

protected PropertyChangeListener propertyChangeListener

Constructors

BasicSliderUI

public BasicSliderUI(JSlider b)

Methods

getShadowColor

protected Color getShadowColor()

getHighlightColor

protected Color getHighlightColor()

getFocusColor

protected Color getFocusColor()

isDragging

protected boolean isDragging()

Returns true if the user is dragging the slider.

Returns:

true if the user is dragging the slider

Since:

1.5

createUI

public static ComponentUI createUI(JComponent b)

installUI

public void installUI(JComponent c)

Description copied from class: ComponentUI

Configures the specified component appropriately for the look and feel. This method is invoked when the ComponentUI instance is being installed as the UI delegate on the specified component. This method should completely configure the component for the look and feel, including the following:

1. Install default property values for color, fonts, borders, icons, opacity, etc. on the component. Whenever possible, property values initialized by the client program should not be overridden.
2. Install a LayoutManager on the component if necessary.
3. Create/add any required sub-components to the component.
4. Create/install event listeners on the component.
5. Create/install a PropertyChangeListener on the component in order to detect and respond to component property changes appropriately.
6. Install keyboard UI (mnemonics, traversal, etc.) on the component.
7. Initialize any appropriate instance data.

Overrides:

installUI in class ComponentUI

Parameters:

c - the component where this UI delegate is being installed

See Also:

ComponentUI.uninstallUI(javax.swing.JComponent), JComponent.setUI(javax.swing.plaf.ComponentUI), JComponent.updateUI()

uninstallUI

public void uninstallUI(JComponent c)

Description copied from class: ComponentUI

Reverses configuration which was done on the specified component during installUI. This method is invoked when this UIComponent instance is being removed as the UI delegate for the specified component. This method should undo the configuration performed in installUI, being careful to leave the JComponent instance in a clean state (no extraneous listeners, look-and-feel-specific property objects, etc.). This should include the following:

1. Remove any UI-set borders from the component.
2. Remove any UI-set layout managers on the component.
3. Remove any UI-added sub-components from the component.
4. Remove any UI-added event/property listeners from the component.
5. Remove any UI-installed keyboard UI from the component.
6. Nullify any allocated instance data objects to allow for GC.

Overrides:

uninstallUI in class ComponentUI

Parameters:

c - the component from which this UI delegate is being removed; this argument is often ignored, but might be used if the UI object is stateless and shared by multiple components

See Also:

ComponentUI.installUI(javax.swing.JComponent), JComponent.updateUI()

installDefaults

protected void installDefaults(JSlider slider)

uninstallDefaults

protected void uninstallDefaults(JSlider slider)

createTrackListener

protected BasicSliderUI.TrackListener createTrackListener(JSlider slider)

createChangeListener

protected ChangeListener createChangeListener(JSlider slider)

createComponentListener

protected ComponentListener createComponentListener(JSlider slider)

createFocusListener

protected FocusListener createFocusListener(JSlider slider)

createScrollListener

protected BasicSliderUI.ScrollListener createScrollListener(JSlider slider)

createPropertyChangeListener

protected PropertyChangeListener createPropertyChangeListener(JSlider slider)

installListeners

protected void installListeners(JSlider slider)

uninstallListeners

protected void uninstallListeners(JSlider slider)

installKeyboardActions

protected void installKeyboardActions(JSlider slider)

uninstallKeyboardActions

protected void uninstallKeyboardActions(JSlider slider)

getBaseline

public int getBaseline(JComponent c,
                       int width,
                       int height)

Returns the baseline.

Overrides:

getBaseline in class ComponentUI

Parameters:

c - JComponent baseline is being requested for

width - the width to get the baseline for

height - the height to get the baseline for

Returns:

baseline or a value < 0 indicating there is no reasonable baseline

Throws:

NullPointerException - if c is null

IllegalArgumentException - if width or height is < 0

Since:

1.6

See Also:

JComponent.getBaseline(int, int)

getBaselineResizeBehavior

public Component.BaselineResizeBehavior getBaselineResizeBehavior(JComponent c)

Returns an enum indicating how the baseline of the component changes as the size changes.

Overrides:

getBaselineResizeBehavior in class ComponentUI

Parameters:

c - JComponent to return baseline resize behavior for

Returns:

an enum indicating how the baseline changes as the component size changes

Throws:

NullPointerException - if c is null

Since:

1.6

See Also:

JComponent.getBaseline(int, int)

labelsHaveSameBaselines

protected boolean labelsHaveSameBaselines()

Returns true if all the labels from the label table have the same baseline.

Returns:

true if all the labels from the label table have the same baseline

Since:

1.6

getPreferredHorizontalSize

public Dimension getPreferredHorizontalSize()

getPreferredVerticalSize

public Dimension getPreferredVerticalSize()

getMinimumHorizontalSize

public Dimension getMinimumHorizontalSize()

getMinimumVerticalSize

public Dimension getMinimumVerticalSize()

getPreferredSize

public Dimension getPreferredSize(JComponent c)

Description copied from class: ComponentUI

Returns the specified component's preferred size appropriate for the look and feel. If null is returned, the preferred 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 returns null.

Overrides:

getPreferredSize in class ComponentUI

Parameters:

c - the component whose preferred size is being queried; this argument is often ignored, but might be used if the UI object is stateless and shared by multiple components

See Also:

JComponent.getPreferredSize(), LayoutManager.preferredLayoutSize(java.awt.Container)

getMinimumSize

public Dimension getMinimumSize(JComponent c)

Description copied from class: ComponentUI

Returns the specified component's minimum size appropriate for the look and feel. If null 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 invokes getPreferredSize and returns that value.

Overrides:

getMinimumSize in class ComponentUI

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:

a Dimension object or null

See Also:

JComponent.getMinimumSize(), LayoutManager.minimumLayoutSize(java.awt.Container), ComponentUI.getPreferredSize(javax.swing.JComponent)

getMaximumSize

public Dimension getMaximumSize(JComponent c)

Description copied from class: ComponentUI

Returns the specified component's maximum size appropriate for the look and feel. If null 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 invokes getPreferredSize and returns that value.

Overrides:

getMaximumSize in class ComponentUI

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:

a Dimension object or null

See Also:

JComponent.getMaximumSize(), LayoutManager2.maximumLayoutSize(java.awt.Container)

calculateGeometry

protected void calculateGeometry()

calculateFocusRect

protected void calculateFocusRect()

calculateThumbSize

protected void calculateThumbSize()

calculateContentRect

protected void calculateContentRect()

calculateThumbLocation

protected void calculateThumbLocation()

calculateTrackBuffer

protected void calculateTrackBuffer()

calculateTrackRect

protected void calculateTrackRect()

getTickLength

protected int getTickLength()

Gets the height of the tick area for horizontal sliders and the width of the tick area for vertical sliders. BasicSliderUI uses the returned value to determine the tick area rectangle. If you want to give your ticks some room, make this larger than you need and paint your ticks away from the sides in paintTicks().

calculateTickRect

protected void calculateTickRect()

calculateLabelRect

protected void calculateLabelRect()

getThumbSize

protected Dimension getThumbSize()

getWidthOfWidestLabel

protected int getWidthOfWidestLabel()

getHeightOfTallestLabel

protected int getHeightOfTallestLabel()

getWidthOfHighValueLabel

protected int getWidthOfHighValueLabel()

getWidthOfLowValueLabel

protected int getWidthOfLowValueLabel()

getHeightOfHighValueLabel

protected int getHeightOfHighValueLabel()

getHeightOfLowValueLabel

protected int getHeightOfLowValueLabel()

drawInverted

protected boolean drawInverted()

getHighestValue

protected Integer getHighestValue()

Returns the biggest value that has an entry in the label table.

Returns:

biggest value that has an entry in the label table, or null.

Since:

1.6

getLowestValue

protected Integer getLowestValue()

Returns the smallest value that has an entry in the label table.

Returns:

smallest value that has an entry in the label table, or null.

Since:

1.6

getLowestValueLabel

protected Component getLowestValueLabel()

Returns the label that corresponds to the highest slider value in the label table.

See Also:

JSlider.setLabelTable(java.util.Dictionary)

getHighestValueLabel

protected Component getHighestValueLabel()

Returns the label that corresponds to the lowest slider value in the label table.

See Also:

JSlider.setLabelTable(java.util.Dictionary)

paint

public void paint(Graphics g,
                  JComponent c)

Description copied from class: ComponentUI

Paints the specified component appropriately for the look and feel. This method is invoked from the ComponentUI.update method when the specified component is being painted. Subclasses should override this method and use the specified Graphics object to render the content of the component.

Overrides:

paint in class ComponentUI

Parameters:

g - the Graphics context in which to paint

c - 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:

ComponentUI.update(java.awt.Graphics, javax.swing.JComponent)

recalculateIfInsetsChanged

protected void recalculateIfInsetsChanged()

recalculateIfOrientationChanged

protected void recalculateIfOrientationChanged()

paintFocus

public void paintFocus(Graphics g)

paintTrack

public void paintTrack(Graphics g)

paintTicks

public void paintTicks(Graphics g)

paintMinorTickForHorizSlider

protected void paintMinorTickForHorizSlider(Graphics g,
                                            Rectangle tickBounds,
                                            int x)

paintMajorTickForHorizSlider

protected void paintMajorTickForHorizSlider(Graphics g,
                                            Rectangle tickBounds,
                                            int x)

paintMinorTickForVertSlider

protected void paintMinorTickForVertSlider(Graphics g,
                                           Rectangle tickBounds,
                                           int y)

paintMajorTickForVertSlider

protected void paintMajorTickForVertSlider(Graphics g,
                                           Rectangle tickBounds,
                                           int y)

paintLabels

public void paintLabels(Graphics g)

paintHorizontalLabel

protected void paintHorizontalLabel(Graphics g,
                                    int value,
                                    Component label)

Called for every label in the label table. Used to draw the labels for horizontal sliders. The graphics have been translated to labelRect.y already.

See Also:

JSlider.setLabelTable(java.util.Dictionary)

paintVerticalLabel

protected void paintVerticalLabel(Graphics g,
                                  int value,
                                  Component label)

Called for every label in the label table. Used to draw the labels for vertical sliders. The graphics have been translated to labelRect.x already.

See Also:

JSlider.setLabelTable(java.util.Dictionary)

paintThumb

public void paintThumb(Graphics g)

setThumbLocation

public void setThumbLocation(int x,
                             int y)

scrollByBlock

public void scrollByBlock(int direction)

scrollByUnit

public void scrollByUnit(int direction)

scrollDueToClickInTrack

protected void scrollDueToClickInTrack(int dir)

This function is called when a mousePressed was detected in the track, not in the thumb. The default behavior is to scroll by block. You can override this method to stop it from scrolling or to add additional behavior.

xPositionForValue

protected int xPositionForValue(int value)

yPositionForValue

protected int yPositionForValue(int value)

yPositionForValue

protected int yPositionForValue(int value,
                                int trackY,
                                int trackHeight)

Returns the y location for the specified value. No checking is done on the arguments. In particular if trackHeight is negative undefined results may occur.

Parameters:

value - the slider value to get the location for

trackY - y-origin of the track

trackHeight - the height of the track

Since:

1.6

valueForYPosition

public int valueForYPosition(int yPos)

Returns the value at the y position. If yPos is beyond the track at the the bottom or the top, this method sets the value to either the minimum or maximum value of the slider, depending on if the slider is inverted or not.

valueForXPosition

public int valueForXPosition(int xPos)

Returns the value at the x position. If xPos is beyond the track at the left or the right, this method sets the value to either the minimum or maximum value of the slider, depending on if the slider is inverted or not.