javax.swing.plaf.basic
Class BasicTreeUI

java.lang.Object
  |
  +--javax.swing.plaf.ComponentUI
        |
        +--javax.swing.plaf.TreeUI
              |
              +--javax.swing.plaf.basic.BasicTreeUI

Direct Known Subclasses:

MetalTreeUI

public class BasicTreeUI

extends TreeUI

The basic L&F for a hierarchical data structure.

Nested Class Summary

class	BasicTreeUI.CellEditorHandler Listener responsible for getting cell editing events and updating the tree accordingly.
class	BasicTreeUI.ComponentHandler Updates the preferred size when scrolling (if necessary).
class	BasicTreeUI.FocusHandler Repaints the lead selection row when focus is lost/gained.
class	BasicTreeUI.KeyHandler This is used to get mutliple key down events to appropriately generate events.
class	BasicTreeUI.MouseHandler TreeMouseListener is responsible for updating the selection based on mouse events.
class	BasicTreeUI.MouseInputHandler MouseInputHandler handles passing all mouse events, including mouse motion events, until the mouse is released to the destination it is constructed with.
class	BasicTreeUI.NodeDimensionsHandler Class responsible for getting size of node, method is forwarded to BasicTreeUI method.
class	BasicTreeUI.PropertyChangeHandler PropertyChangeListener for the tree.
class	BasicTreeUI.SelectionModelPropertyChangeHandler Listener on the TreeSelectionModel, resets the row selection if any of the properties of the model change.
class	BasicTreeUI.TreeCancelEditingAction ActionListener that invokes cancelEditing when action performed.
class	BasicTreeUI.TreeExpansionHandler Updates the TreeState in response to nodes expanding/collapsing.
class	BasicTreeUI.TreeHomeAction TreeHomeAction is used to handle end/home actions.
class	BasicTreeUI.TreeIncrementAction TreeIncrementAction is used to handle up/down actions.
class	BasicTreeUI.TreeModelHandler Forwards all TreeModel events to the TreeState.
class	BasicTreeUI.TreePageAction TreePageAction handles page up and page down events.
class	BasicTreeUI.TreeSelectionHandler Listens for changes in the selection model and updates the display accordingly.
class	BasicTreeUI.TreeToggleAction For the first selected row expandedness will be toggled.
class	BasicTreeUI.TreeTraverseAction TreeTraverseAction is the action used for left/right keys.

Field Summary

protected TreeCellEditor	cellEditor Editor for the tree.
protected Icon	collapsedIcon
protected boolean	createdCellEditor Set to true if editor that is currently in the tree was created by this instance.
protected boolean	createdRenderer Set to true if the renderer that is currently in the tree was created by this instance.
protected TreeCellRenderer	currentCellRenderer Renderer that is being used to do the actual cell drawing.
protected int	depthOffset How much the depth should be offset to properly calculate x locations.
protected Hashtable	drawingCache Used for minimizing the drawing of vertical lines.
protected Component	editingComponent When editing, this will be the Component that is doing the actual editing.
protected TreePath	editingPath Path that is being edited.
protected int	editingRow Row that is being edited.
protected boolean	editorHasDifferentSize Set to true if the editor has a different size than the renderer.
protected Icon	expandedIcon
protected boolean	largeModel True if doing optimizations for a largeModel.
protected int	lastSelectedRow Index of the row that was last selected.
protected int	leftChildIndent Distance between left margin and where vertical dashes will be drawn.
protected AbstractLayoutCache.NodeDimensions	nodeDimensions Reponsible for telling the TreeState the size needed for a node.
protected Dimension	preferredMinSize Minimum preferred size.
protected Dimension	preferredSize Size needed to completely display all the nodes.
protected CellRendererPane	rendererPane Used to paint the TreeCellRenderer.
protected int	rightChildIndent Distance to add to leftChildIndent to determine where cell contents will be drawn.
protected boolean	stopEditingInCompleteEditing Set to false when editing and shouldSelectCell() returns true meaning the node should be selected before editing, used in completeEditing.
protected int	totalChildIndent Total distance that will be indented.
protected JTree	tree Component that we're going to be drawing into.
protected TreeModel	treeModel Used to determine what to display.
protected TreeSelectionModel	treeSelectionModel Model maintaing the selection.
protected AbstractLayoutCache	treeState Object responsible for handling sizing and expanded issues.
protected boolean	validCachedPreferredSize Is the preferredSize valid?

Constructor Summary

BasicTreeUI()

Method Summary

void	cancelEditing(JTree tree) Cancels the current editing session.
protected void	checkForClickInExpandControl(TreePath path, int mouseX, int mouseY) If the mouseX and mouseY are in the expand/collapse region of the row, this will toggle the row.
protected void	completeEditing() Messages to stop the editing session.
protected void	completeEditing(boolean messageStop, boolean messageCancel, boolean messageTree) Stops the editing session.
protected void	completeUIInstall() Invoked from installUI after all the defaults/listeners have been installed.
protected void	completeUIUninstall()
protected void	configureLayoutCache() Resets the TreeState instance based on the tree we're providing the look and feel for.
protected CellEditorListener	createCellEditorListener() Creates a listener to handle events from the current editor.
protected CellRendererPane	createCellRendererPane() Returns the renderer pane that renderer components are placed in.
protected ComponentListener	createComponentListener() Creates and returns a new ComponentHandler.
protected TreeCellEditor	createDefaultCellEditor() Creates a default cell editor.
protected TreeCellRenderer	createDefaultCellRenderer() Returns the default cell renderer that is used to do the stamping of each node.
protected FocusListener	createFocusListener() Creates a listener that is responsible for updating the display when focus is lost/gained.
protected KeyListener	createKeyListener() Creates the listener reponsible for getting key events from the tree.
protected AbstractLayoutCache	createLayoutCache() Creates the object responsible for managing what is expanded, as well as the size of nodes.
protected MouseListener	createMouseListener() Creates the listener responsible for updating the selection based on mouse events.
protected AbstractLayoutCache.NodeDimensions	createNodeDimensions() Creates an instance of NodeDimensions that is able to determine the size of a given node in the tree.
protected PropertyChangeListener	createPropertyChangeListener() Creates a listener that is responsible that updates the UI based on how the tree changes.
protected PropertyChangeListener	createSelectionModelPropertyChangeListener() Creates the listener responsible for getting property change events from the selection model.
protected TreeExpansionListener	createTreeExpansionListener() Creates and returns the object responsible for updating the treestate when nodes expanded state changes.
protected TreeModelListener	createTreeModelListener() Returns a listener that can update the tree when the model changes.
protected TreeSelectionListener	createTreeSelectionListener() Creates the listener that updates the display based on selection change methods.
static ComponentUI	createUI(JComponent x) Returns an instance of the UI delegate for the specified component.
protected void	drawCentered(Component c, Graphics graphics, Icon icon, int x, int y)
protected void	drawDashedHorizontalLine(Graphics g, int y, int x1, int x2)
protected void	drawDashedVerticalLine(Graphics g, int x, int y1, int y2)
protected void	ensureRowsAreVisible(int beginRow, int endRow) Ensures that the rows identified by beginRow through endRow are visible.
protected TreeCellEditor	getCellEditor()
protected TreeCellRenderer	getCellRenderer() Return currentCellRenderer, which will either be the trees renderer, or defaultCellRenderer, which ever wasn't null.
TreePath	getClosestPathForLocation(JTree tree, int x, int y) Returns the path to the node that is closest to x,y.
Icon	getCollapsedIcon()
TreePath	getEditingPath(JTree tree) Returns the path to the element that is being edited.
Icon	getExpandedIcon()
protected Color	getHashColor()
protected int	getHorizontalLegBuffer() The horizontal element of legs between nodes starts at the right of the left-hand side of the child node by default.
protected TreePath	getLastChildPath(TreePath parent) Returns a path to the last child of parent.
int	getLeftChildIndent()
Dimension	getMaximumSize(JComponent c) Returns the maximum size for this component, which will be the preferred size if the instance is currently in a JTree, or 0, 0.
Dimension	getMinimumSize(JComponent c) Returns the minimum size for this component.
protected TreeModel	getModel()
Rectangle	getPathBounds(JTree tree, TreePath path) Returns the Rectangle enclosing the label portion that the last item in path will be drawn into.
TreePath	getPathForRow(JTree tree, int row) Returns the path for passed in row.
Dimension	getPreferredMinSize() Returns the minimum preferred size.
Dimension	getPreferredSize(JComponent c) Returns the preferred size to properly display the tree, this is a cover method for getPreferredSize(c, false).
Dimension	getPreferredSize(JComponent c, boolean checkConsistancy) Returns the preferred size to represent the tree in c.
int	getRightChildIndent()
int	getRowCount(JTree tree) Returns the number of rows that are being displayed.
int	getRowForPath(JTree tree, TreePath path) Returns the row that the last item identified in path is visible at.
protected int	getRowHeight()
protected TreeSelectionModel	getSelectionModel()
protected boolean	getShowsRootHandles()
protected int	getVerticalLegBuffer() The vertical element of legs between nodes starts at the bottom of the parent node by default.
protected void	handleExpandControlClick(TreePath path, int mouseX, int mouseY) Messaged when the user clicks the particular row, this invokes toggleExpandState.
protected void	installComponents() Intalls the subcomponents of the tree, which is the renderer pane.
protected void	installDefaults()
protected void	installKeyboardActions()
protected void	installListeners()
void	installUI(JComponent c) Configures the specified component appropriate for the look and feel.
protected boolean	isEditable()
boolean	isEditing(JTree tree) Returns true if the tree is being edited.
protected boolean	isLargeModel()
protected boolean	isLeaf(int row)
protected boolean	isLocationInExpandControl(TreePath path, int mouseX, int mouseY) Returns true if mouseX and mouseY fall in the area of row that is used to expand/collapse the node and the node at row does not represent a leaf.
protected boolean	isMultiSelectEvent(MouseEvent event) Returning true signifies a mouse event on the node should select from the anchor point.
protected boolean	isRootVisible()
protected boolean	isToggleEvent(MouseEvent event) Returning true indicates the row under the mouse should be toggled based on the event.
protected boolean	isToggleSelectionEvent(MouseEvent event) Returning true signifies a mouse event on the node should toggle the selection of only the row under mouse.
void	paint(Graphics g, JComponent c) Paints the specified component appropriate for the look and feel.
protected void	paintExpandControl(Graphics g, Rectangle clipBounds, Insets insets, Rectangle bounds, TreePath path, int row, boolean isExpanded, boolean hasBeenExpanded, boolean isLeaf) Paints the expand (toggle) part of a row.
protected void	paintHorizontalLine(Graphics g, JComponent c, int y, int left, int right) Paints a horizontal line.
protected void	paintHorizontalPartOfLeg(Graphics g, Rectangle clipBounds, Insets insets, Rectangle bounds, TreePath path, int row, boolean isExpanded, boolean hasBeenExpanded, boolean isLeaf) Paints the horizontal part of the leg.
protected void	paintRow(Graphics g, Rectangle clipBounds, Insets insets, Rectangle bounds, TreePath path, int row, boolean isExpanded, boolean hasBeenExpanded, boolean isLeaf) Paints the renderer part of a row.
protected void	paintVerticalLine(Graphics g, JComponent c, int x, int top, int bottom) Paints a vertical line.
protected void	paintVerticalPartOfLeg(Graphics g, Rectangle clipBounds, Insets insets, TreePath path) Paints the vertical part of the leg.
protected void	pathWasCollapsed(TreePath path) Messaged from the VisibleTreeNode after it has collapsed.
protected void	pathWasExpanded(TreePath path) Messaged from the VisibleTreeNode after it has been expanded.
protected void	prepareForUIInstall() Invoked after the tree instance variable has been set, but before any defaults/listeners have been installed.
protected void	prepareForUIUninstall()
protected void	selectPathForEvent(TreePath path, MouseEvent event) Messaged to update the selection based on a MouseEvent over a particular row.
protected void	setCellEditor(TreeCellEditor editor) Sets the cell editor.
protected void	setCellRenderer(TreeCellRenderer tcr) Sets the TreeCellRenderer to tcr.
void	setCollapsedIcon(Icon newG)
protected void	setEditable(boolean newValue) Configures the receiver to allow, or not allow, editing.
void	setExpandedIcon(Icon newG)
protected void	setHashColor(Color color)
protected void	setLargeModel(boolean largeModel) Updates the componentListener, if necessary.
void	setLeftChildIndent(int newAmount)
protected void	setModel(TreeModel model) Sets the TreeModel.
void	setPreferredMinSize(Dimension newSize) Sets the preferred minimum size.
void	setRightChildIndent(int newAmount)
protected void	setRootVisible(boolean newValue) Sets the root to being visible.
protected void	setRowHeight(int rowHeight) Sets the row height, this is forwarded to the treeState.
protected void	setSelectionModel(TreeSelectionModel newLSM) Resets the selection model.
protected void	setShowsRootHandles(boolean newValue) Determines whether the node handles are to be displayed.
protected boolean	shouldPaintExpandControl(TreePath path, int row, boolean isExpanded, boolean hasBeenExpanded, boolean isLeaf) Returns true if the expand (toggle) control should be drawn for the specified row.
protected boolean	startEditing(TreePath path, MouseEvent event) Will start editing for node if there is a cellEditor and shouldSelectCell returns true.
void	startEditingAtPath(JTree tree, TreePath path) Selects the last item in path and tries to edit it.
boolean	stopEditing(JTree tree) Stops the current editing session.
protected void	toggleExpandState(TreePath path) Expands path if it is not expanded, or collapses row if it is expanded.
protected void	uninstallComponents() Uninstalls the renderer pane.
protected void	uninstallDefaults()
protected void	uninstallKeyboardActions()
protected void	uninstallListeners()
void	uninstallUI(JComponent c) Reverses configuration which was done on the specified component during installUI.
protected void	updateCachedPreferredSize() Updates the preferredSize instance variable, which is returned from getPreferredSize().
protected void	updateCellEditor() Updates the cellEditor based on the editability of the JTree that we're contained in.
protected void	updateDepthOffset() Updates how much each depth should be offset by.
protected void	updateExpandedDescendants(TreePath path) Updates the expanded state of all the descendants of path by getting the expanded descendants from the tree and forwarding to the tree state.
protected void	updateLayoutCacheExpandedNodes() Makes all the nodes that are expanded in JTree expanded in LayoutCache.
protected void	updateRenderer() Messaged from the tree we're in when the renderer has changed.
protected void	updateSize() Marks the cached size as being invalid, and messages the tree with treeDidChange.

Methods inherited from class javax.swing.plaf.ComponentUI

contains, getAccessibleChild, getAccessibleChildrenCount, update

Methods inherited from class java.lang.Object

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

Field Detail

collapsedIcon

protected transient Icon collapsedIcon

expandedIcon

protected transient Icon expandedIcon

leftChildIndent

protected int leftChildIndent

Distance between left margin and where vertical dashes will be drawn.

rightChildIndent

protected int rightChildIndent

Distance to add to leftChildIndent to determine where cell contents will be drawn.

totalChildIndent

protected int totalChildIndent

Total distance that will be indented. The sum of leftChildIndent and rightChildIndent.

preferredMinSize

protected Dimension preferredMinSize

Minimum preferred size.

lastSelectedRow

protected int lastSelectedRow

Index of the row that was last selected.

tree

protected JTree tree

Component that we're going to be drawing into.

currentCellRenderer

protected transient TreeCellRenderer currentCellRenderer

Renderer that is being used to do the actual cell drawing.

createdRenderer

protected boolean createdRenderer

Set to true if the renderer that is currently in the tree was created by this instance.

cellEditor

protected transient TreeCellEditor cellEditor

Editor for the tree.

createdCellEditor

protected boolean createdCellEditor

Set to true if editor that is currently in the tree was created by this instance.

stopEditingInCompleteEditing

protected boolean stopEditingInCompleteEditing

Set to false when editing and shouldSelectCell() returns true meaning the node should be selected before editing, used in completeEditing.

rendererPane

protected CellRendererPane rendererPane

Used to paint the TreeCellRenderer.

preferredSize

protected Dimension preferredSize

Size needed to completely display all the nodes.

validCachedPreferredSize

protected boolean validCachedPreferredSize

Is the preferredSize valid?

treeState

protected AbstractLayoutCache treeState

Object responsible for handling sizing and expanded issues.

drawingCache

protected Hashtable drawingCache

Used for minimizing the drawing of vertical lines.

largeModel

protected boolean largeModel

True if doing optimizations for a largeModel. Subclasses that don't support this may wish to override createLayoutCache to not return a FixedHeightLayoutCache instance.

nodeDimensions

protected AbstractLayoutCache.NodeDimensions nodeDimensions

Reponsible for telling the TreeState the size needed for a node.

treeModel

protected TreeModel treeModel

Used to determine what to display.

treeSelectionModel

protected TreeSelectionModel treeSelectionModel

Model maintaing the selection.

depthOffset

protected int depthOffset

How much the depth should be offset to properly calculate x locations. This is based on whether or not the root is visible, and if the root handles are visible.

editingComponent

protected Component editingComponent

When editing, this will be the Component that is doing the actual editing.

editingPath

protected TreePath editingPath

Path that is being edited.

editingRow

protected int editingRow

Row that is being edited. Should only be referenced if editingComponent is not null.

editorHasDifferentSize

protected boolean editorHasDifferentSize

Set to true if the editor has a different size than the renderer.

Constructor Detail

BasicTreeUI

public BasicTreeUI()

Method Detail

createUI

public static ComponentUI createUI(JComponent x)

Description copied from class: ComponentUI

Returns an instance of the UI delegate for the specified component. Each subclass must provide its own static createUI method that returns an instance of that UI delegate subclass. If the UI delegate subclass is stateless, it may return an instance that is shared by multiple components. If the UI delegate is stateful, then it should return a new instance per component. The default implementation of this method throws an error, as it should never be invoked.

getHashColor

protected Color getHashColor()

setHashColor

protected void setHashColor(Color color)

setLeftChildIndent

public void setLeftChildIndent(int newAmount)

getLeftChildIndent

public int getLeftChildIndent()

setRightChildIndent

public void setRightChildIndent(int newAmount)

getRightChildIndent

public int getRightChildIndent()

setExpandedIcon

public void setExpandedIcon(Icon newG)

getExpandedIcon

public Icon getExpandedIcon()

setCollapsedIcon

public void setCollapsedIcon(Icon newG)

getCollapsedIcon

public Icon getCollapsedIcon()

setLargeModel

protected void setLargeModel(boolean largeModel)

Updates the componentListener, if necessary.

isLargeModel

protected boolean isLargeModel()

setRowHeight

protected void setRowHeight(int rowHeight)

Sets the row height, this is forwarded to the treeState.

getRowHeight

protected int getRowHeight()

setCellRenderer

protected void setCellRenderer(TreeCellRenderer tcr)

Sets the TreeCellRenderer to tcr. This invokes updateRenderer.

getCellRenderer

protected TreeCellRenderer getCellRenderer()

Return currentCellRenderer, which will either be the trees renderer, or defaultCellRenderer, which ever wasn't null.

setModel

protected void setModel(TreeModel model)

Sets the TreeModel.

getModel

protected TreeModel getModel()

setRootVisible

protected void setRootVisible(boolean newValue)

Sets the root to being visible.

isRootVisible

protected boolean isRootVisible()

setShowsRootHandles

protected void setShowsRootHandles(boolean newValue)

Determines whether the node handles are to be displayed.

getShowsRootHandles

protected boolean getShowsRootHandles()

setCellEditor

protected void setCellEditor(TreeCellEditor editor)

Sets the cell editor.

getCellEditor

protected TreeCellEditor getCellEditor()

setEditable

protected void setEditable(boolean newValue)

Configures the receiver to allow, or not allow, editing.

isEditable

protected boolean isEditable()

setSelectionModel

protected void setSelectionModel(TreeSelectionModel newLSM)

Resets the selection model. The appropriate listener are installed on the model.

getSelectionModel

protected TreeSelectionModel getSelectionModel()

getPathBounds

public Rectangle getPathBounds(JTree tree,
                               TreePath path)

Returns the Rectangle enclosing the label portion that the last item in path will be drawn into. Will return null if any component in path is currently valid.

Specified by:

getPathBounds in class TreeUI

getPathForRow

public TreePath getPathForRow(JTree tree,
                              int row)

Returns the path for passed in row. If row is not visible null is returned.

Specified by:

getPathForRow in class TreeUI

getRowForPath

public int getRowForPath(JTree tree,
                         TreePath path)

Returns the row that the last item identified in path is visible at. Will return -1 if any of the elements in path are not currently visible.

Specified by:

getRowForPath in class TreeUI

getRowCount

public int getRowCount(JTree tree)

Returns the number of rows that are being displayed.

Specified by:

getRowCount in class TreeUI

getClosestPathForLocation

public TreePath getClosestPathForLocation(JTree tree,
                                          int x,
                                          int y)

Returns the path to the node that is closest to x,y. If there is nothing currently visible this will return null, otherwise it'll always return a valid path. If you need to test if the returned object is exactly at x, y you should get the bounds for the returned path and test x, y against that.

Specified by:

getClosestPathForLocation in class TreeUI

isEditing

public boolean isEditing(JTree tree)

Returns true if the tree is being edited. The item that is being edited can be returned by getEditingPath().

Specified by:

isEditing in class TreeUI

stopEditing

public boolean stopEditing(JTree tree)

Stops the current editing session. This has no effect if the tree isn't being edited. Returns true if the editor allows the editing session to stop.

Specified by:

stopEditing in class TreeUI

cancelEditing

public void cancelEditing(JTree tree)

Cancels the current editing session.

Specified by:

cancelEditing in class TreeUI

startEditingAtPath

public void startEditingAtPath(JTree tree,
                               TreePath path)

Selects the last item in path and tries to edit it. Editing will fail if the CellEditor won't allow it for the selected item.

Specified by:

startEditingAtPath in class TreeUI

getEditingPath

public TreePath getEditingPath(JTree tree)

Returns the path to the element that is being edited.

Specified by:

getEditingPath in class TreeUI

installUI

public void installUI(JComponent c)

Description copied from class: ComponentUI

Configures the specified component appropriate 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 any 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()

prepareForUIInstall

protected void prepareForUIInstall()

Invoked after the tree instance variable has been set, but before any defaults/listeners have been installed.

completeUIInstall

protected void completeUIInstall()

Invoked from installUI after all the defaults/listeners have been installed.

installDefaults

protected void installDefaults()

installListeners

protected void installListeners()

installKeyboardActions

protected void installKeyboardActions()

installComponents

protected void installComponents()

Intalls the subcomponents of the tree, which is the renderer pane.

createNodeDimensions

protected AbstractLayoutCache.NodeDimensions createNodeDimensions()

Creates an instance of NodeDimensions that is able to determine the size of a given node in the tree.

createPropertyChangeListener

protected PropertyChangeListener createPropertyChangeListener()

Creates a listener that is responsible that updates the UI based on how the tree changes.

createMouseListener

protected MouseListener createMouseListener()

Creates the listener responsible for updating the selection based on mouse events.

createFocusListener

protected FocusListener createFocusListener()

Creates a listener that is responsible for updating the display when focus is lost/gained.

createKeyListener

protected KeyListener createKeyListener()

Creates the listener reponsible for getting key events from the tree.

createSelectionModelPropertyChangeListener

protected PropertyChangeListener createSelectionModelPropertyChangeListener()

Creates the listener responsible for getting property change events from the selection model.

createTreeSelectionListener

protected TreeSelectionListener createTreeSelectionListener()

Creates the listener that updates the display based on selection change methods.

createCellEditorListener

protected CellEditorListener createCellEditorListener()

Creates a listener to handle events from the current editor.

createComponentListener

protected ComponentListener createComponentListener()

Creates and returns a new ComponentHandler. This is used for the large model to mark the validCachedPreferredSize as invalid when the component moves.

createTreeExpansionListener

protected TreeExpansionListener createTreeExpansionListener()

Creates and returns the object responsible for updating the treestate when nodes expanded state changes.

createLayoutCache

protected AbstractLayoutCache createLayoutCache()

Creates the object responsible for managing what is expanded, as well as the size of nodes.

createCellRendererPane

protected CellRendererPane createCellRendererPane()

Returns the renderer pane that renderer components are placed in.

createDefaultCellEditor

protected TreeCellEditor createDefaultCellEditor()

Creates a default cell editor.

createDefaultCellRenderer

protected TreeCellRenderer createDefaultCellRenderer()

Returns the default cell renderer that is used to do the stamping of each node.

createTreeModelListener

protected TreeModelListener createTreeModelListener()

Returns a listener that can update the tree when the model changes.

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()

prepareForUIUninstall

protected void prepareForUIUninstall()

completeUIUninstall

protected void completeUIUninstall()

uninstallDefaults

protected void uninstallDefaults()

uninstallListeners

protected void uninstallListeners()

uninstallKeyboardActions

protected void uninstallKeyboardActions()

uninstallComponents

protected void uninstallComponents()

Uninstalls the renderer pane.

paint

public void paint(Graphics g,
                  JComponent c)

Description copied from class: ComponentUI

Paints the specified component appropriate 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)

paintHorizontalPartOfLeg

protected void paintHorizontalPartOfLeg(Graphics g,
                                        Rectangle clipBounds,
                                        Insets insets,
                                        Rectangle bounds,
                                        TreePath path,
                                        int row,
                                        boolean isExpanded,
                                        boolean hasBeenExpanded,
                                        boolean isLeaf)

Paints the horizontal part of the leg. The receiver should NOT modify clipBounds, or insets.

NOTE: parentRow can be -1 if the root is not visible.

paintVerticalPartOfLeg

protected void paintVerticalPartOfLeg(Graphics g,
                                      Rectangle clipBounds,
                                      Insets insets,
                                      TreePath path)

Paints the vertical part of the leg. The receiver should NOT modify clipBounds, insets.

paintExpandControl

protected void paintExpandControl(Graphics g,
                                  Rectangle clipBounds,
                                  Insets insets,
                                  Rectangle bounds,
                                  TreePath path,
                                  int row,
                                  boolean isExpanded,
                                  boolean hasBeenExpanded,
                                  boolean isLeaf)

Paints the expand (toggle) part of a row. The receiver should NOT modify clipBounds, or insets.

paintRow

protected void paintRow(Graphics g,
                        Rectangle clipBounds,
                        Insets insets,
                        Rectangle bounds,
                        TreePath path,
                        int row,
                        boolean isExpanded,
                        boolean hasBeenExpanded,
                        boolean isLeaf)

Paints the renderer part of a row. The receiver should NOT modify clipBounds, or insets.

shouldPaintExpandControl

protected boolean shouldPaintExpandControl(TreePath path,
                                           int row,
                                           boolean isExpanded,
                                           boolean hasBeenExpanded,
                                           boolean isLeaf)

Returns true if the expand (toggle) control should be drawn for the specified row.

paintVerticalLine

protected void paintVerticalLine(Graphics g,
                                 JComponent c,
                                 int x,
                                 int top,
                                 int bottom)

Paints a vertical line.

paintHorizontalLine

protected void paintHorizontalLine(Graphics g,
                                   JComponent c,
                                   int y,
                                   int left,
                                   int right)

Paints a horizontal line.

getVerticalLegBuffer

protected int getVerticalLegBuffer()

The vertical element of legs between nodes starts at the bottom of the parent node by default. This method makes the leg start below that.

getHorizontalLegBuffer

protected int getHorizontalLegBuffer()

The horizontal element of legs between nodes starts at the right of the left-hand side of the child node by default. This method makes the leg end before that.

drawCentered

protected void drawCentered(Component c,
                            Graphics graphics,
                            Icon icon,
                            int x,
                            int y)

drawDashedHorizontalLine

protected void drawDashedHorizontalLine(Graphics g,
                                        int y,
                                        int x1,
                                        int x2)

drawDashedVerticalLine

protected void drawDashedVerticalLine(Graphics g,
                                      int x,
                                      int y1,
                                      int y2)

updateLayoutCacheExpandedNodes

protected void updateLayoutCacheExpandedNodes()

Makes all the nodes that are expanded in JTree expanded in LayoutCache. This invokes updateExpandedDescendants with the root path.

updateExpandedDescendants

protected void updateExpandedDescendants(TreePath path)

Updates the expanded state of all the descendants of path by getting the expanded descendants from the tree and forwarding to the tree state.

getLastChildPath

protected TreePath getLastChildPath(TreePath parent)

Returns a path to the last child of parent.

updateDepthOffset

protected void updateDepthOffset()

Updates how much each depth should be offset by.

updateCellEditor

protected void updateCellEditor()

Updates the cellEditor based on the editability of the JTree that we're contained in. If the tree is editable but doesn't have a cellEditor, a basic one will be used.

updateRenderer

protected void updateRenderer()

Messaged from the tree we're in when the renderer has changed.

configureLayoutCache

protected void configureLayoutCache()

Resets the TreeState instance based on the tree we're providing the look and feel for.

updateSize

protected void updateSize()

Marks the cached size as being invalid, and messages the tree with treeDidChange.

updateCachedPreferredSize

protected void updateCachedPreferredSize()

Updates the preferredSize instance variable, which is returned from getPreferredSize().

For left to right orientations, the size is determined from the current AbstractLayoutCache. For RTL orientations, the preferred size becomes the width minus the minimum x position.

pathWasExpanded

protected void pathWasExpanded(TreePath path)

Messaged from the VisibleTreeNode after it has been expanded.

pathWasCollapsed

protected void pathWasCollapsed(TreePath path)

Messaged from the VisibleTreeNode after it has collapsed.

ensureRowsAreVisible

protected void ensureRowsAreVisible(int beginRow,
                                    int endRow)

Ensures that the rows identified by beginRow through endRow are visible.

setPreferredMinSize

public void setPreferredMinSize(Dimension newSize)

Sets the preferred minimum size.

getPreferredMinSize

public Dimension getPreferredMinSize()

Returns the minimum preferred size.

getPreferredSize

public Dimension getPreferredSize(JComponent c)

Returns the preferred size to properly display the tree, this is a cover method for getPreferredSize(c, false).

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)

getPreferredSize

public Dimension getPreferredSize(JComponent c,
                                  boolean checkConsistancy)

Returns the preferred size to represent the tree in c. If checkConsistancy is true checkConsistancy is messaged first.

getMinimumSize

public Dimension getMinimumSize(JComponent c)

Returns the minimum size for this component. Which will be the min preferred size or 0, 0.

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)

Returns the maximum size for this component, which will be the preferred size if the instance is currently in a JTree, or 0, 0.

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)

completeEditing

protected void completeEditing()

Messages to stop the editing session. If the UI the receiver is providing the look and feel for returns true from getInvokesStopCellEditing, stopCellEditing will invoked on the current editor. Then completeEditing will be messaged with false, true, false to cancel any lingering editing.

completeEditing

protected void completeEditing(boolean messageStop,
                               boolean messageCancel,
                               boolean messageTree)

Stops the editing session. If messageStop is true the editor is messaged with stopEditing, if messageCancel is true the editor is messaged with cancelEditing. If messageTree is true the treeModel is messaged with valueForPathChanged.

startEditing

protected boolean startEditing(TreePath path,
                               MouseEvent event)

Will start editing for node if there is a cellEditor and shouldSelectCell returns true.

This assumes that path is valid and visible.

checkForClickInExpandControl

protected void checkForClickInExpandControl(TreePath path,
                                            int mouseX,
                                            int mouseY)

If the mouseX and mouseY are in the expand/collapse region of the row, this will toggle the row.

isLocationInExpandControl

protected boolean isLocationInExpandControl(TreePath path,
                                            int mouseX,
                                            int mouseY)

Returns true if mouseX and mouseY fall in the area of row that is used to expand/collapse the node and the node at row does not represent a leaf.

handleExpandControlClick

protected void handleExpandControlClick(TreePath path,
                                        int mouseX,
                                        int mouseY)

Messaged when the user clicks the particular row, this invokes toggleExpandState.

toggleExpandState

protected void toggleExpandState(TreePath path)

Expands path if it is not expanded, or collapses row if it is expanded. If expanding a path and JTree scrolls on expand, ensureRowsAreVisible is invoked to scroll as many of the children to visible as possible (tries to scroll to last visible descendant of path).

isToggleSelectionEvent

protected boolean isToggleSelectionEvent(MouseEvent event)

Returning true signifies a mouse event on the node should toggle the selection of only the row under mouse.

isMultiSelectEvent

protected boolean isMultiSelectEvent(MouseEvent event)

Returning true signifies a mouse event on the node should select from the anchor point.

isToggleEvent

protected boolean isToggleEvent(MouseEvent event)

Returning true indicates the row under the mouse should be toggled based on the event. This is invoked after checkForClickInExpandControl, implying the location is not in the expand (toggle) control

selectPathForEvent

protected void selectPathForEvent(TreePath path,
                                  MouseEvent event)

Messaged to update the selection based on a MouseEvent over a particular row. If the event is a toggle selection event, the row is either selected, or deselected. If the event identifies a multi selection event, the selection is updated from the anchor point. Otherwise the row is selected, and if the event specified a toggle event the row is expanded/collapsed.

isLeaf

protected boolean isLeaf(int row)

Returns:

true if the node at row is a leaf.