Class MetalTreeUI

java.lang.Object

javax.swing.plaf.ComponentUI

javax.swing.plaf.TreeUI

javax.swing.plaf.basic.BasicTreeUI

javax.swing.plaf.metal.MetalTreeUI

public class MetalTreeUI
extends BasicTreeUI

The metal look and feel implementation of TreeUI.

MetalTreeUI allows for configuring how to visually render the spacing and delineation between nodes. The following hints are supported:

Descriptions of supported hints: Angled, Horizontal, and None

Hint	Description
Angled	A line is drawn connecting the child to the parent. For handling of the root node refer to JTree.setRootVisible(boolean) and JTree.setShowsRootHandles(boolean).
Horizontal	A horizontal line is drawn dividing the children of the root node.
None	Do not draw any visual indication between nodes.

As it is typically impractical to obtain the TreeUI from the JTree and cast to an instance of MetalTreeUI you enable this property via the client property JTree.lineStyle. For example, to switch to Horizontal style you would do: tree.putClientProperty("JTree.lineStyle", "Horizontal");

The default is Angled.

Nested Class Summary

Nested classes/interfaces inherited from class BasicTreeUI

BasicTreeUI.CellEditorHandler, BasicTreeUI.ComponentHandler, BasicTreeUI.FocusHandler, BasicTreeUI.KeyHandler, BasicTreeUI.MouseHandler, BasicTreeUI.MouseInputHandler, BasicTreeUI.NodeDimensionsHandler, BasicTreeUI.PropertyChangeHandler, BasicTreeUI.SelectionModelPropertyChangeHandler, BasicTreeUI.TreeCancelEditingAction, BasicTreeUI.TreeExpansionHandler, BasicTreeUI.TreeHomeAction, BasicTreeUI.TreeIncrementAction, BasicTreeUI.TreeModelHandler, BasicTreeUI.TreePageAction, BasicTreeUI.TreeSelectionHandler, BasicTreeUI.TreeToggleAction, BasicTreeUI.TreeTraverseAction

Field Summary

Fields inherited from class BasicTreeUI

cellEditor, collapsedIcon, createdCellEditor, createdRenderer, currentCellRenderer, depthOffset, drawingCache, editingComponent, editingPath, editingRow, editorHasDifferentSize, expandedIcon, largeModel, lastSelectedRow, leftChildIndent, nodeDimensions, preferredMinSize, preferredSize, rendererPane, rightChildIndent, stopEditingInCompleteEditing, totalChildIndent, tree, treeModel, treeSelectionModel, treeState, validCachedPreferredSize

Constructor Summary

Constructors

Constructor	Description
MetalTreeUI()	Constructs the MetalTreeUI.

Method Summary

Modifier and Type	Method	Description
static ComponentUI	createUI(JComponent x)	Constructs the MetalTreeUI.
protected void	decodeLineStyle(Object lineStyleFlag)	Converts between the string passed into the client property and the internal representation (currently and int)
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.
void	installUI(JComponent c)	Configures the specified component appropriately for the look and feel.
protected boolean	isLocationInExpandControl(int row, int rowLevel, int mouseX, int mouseY)	Returns true if a point with X coordinate mouseX and Y coordinate mouseY is in expanded control.
void	paint(Graphics g, JComponent c)	Paints the specified component appropriately for the look and feel.
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	paintHorizontalSeparators(Graphics g, JComponent c)	Paints the horizontal separators.
protected void	paintVerticalPartOfLeg(Graphics g, Rectangle clipBounds, Insets insets, TreePath path)	Paints the vertical part of the leg.
void	uninstallUI(JComponent c)	Reverses configuration which was done on the specified component during installUI.

Methods inherited from class BasicTreeUI

cancelEditing, checkForClickInExpandControl, completeEditing, completeEditing, completeUIInstall, completeUIUninstall, configureLayoutCache, createCellEditorListener, createCellRendererPane, createComponentListener, createDefaultCellEditor, createDefaultCellRenderer, createFocusListener, createKeyListener, createLayoutCache, createMouseListener, createNodeDimensions, createPropertyChangeListener, createSelectionModelPropertyChangeListener, createTreeExpansionListener, createTreeModelListener, createTreeSelectionListener, drawCentered, drawDashedHorizontalLine, drawDashedVerticalLine, ensureRowsAreVisible, getBaseline, getBaselineResizeBehavior, getCellEditor, getCellRenderer, getClosestPathForLocation, getCollapsedIcon, getDropLineRect, getEditingPath, getExpandedIcon, getHashColor, getLastChildPath, getLeadSelectionRow, getLeftChildIndent, getMaximumSize, getMinimumSize, getModel, getPathBounds, getPathForRow, getPreferredMinSize, getPreferredSize, getPreferredSize, getRightChildIndent, getRowCount, getRowForPath, getRowHeight, getRowX, getSelectionModel, getShowsRootHandles, getVerticalLegBuffer, handleExpandControlClick, installComponents, installDefaults, installKeyboardActions, installListeners, isDropLine, isEditable, isEditing, isLargeModel, isLeaf, isLocationInExpandControl, isMultiSelectEvent, isRootVisible, isToggleEvent, isToggleSelectionEvent, paintDropLine, paintExpandControl, paintHorizontalLine, paintRow, paintVerticalLine, pathWasCollapsed, pathWasExpanded, prepareForUIInstall, prepareForUIUninstall, selectPathForEvent, setCellEditor, setCellRenderer, setCollapsedIcon, setEditable, setExpandedIcon, setHashColor, setLargeModel, setLeftChildIndent, setModel, setPreferredMinSize, setRightChildIndent, setRootVisible, setRowHeight, setSelectionModel, setShowsRootHandles, shouldPaintExpandControl, startEditing, startEditingAtPath, stopEditing, toggleExpandState, uninstallComponents, uninstallDefaults, uninstallKeyboardActions, uninstallListeners, updateCachedPreferredSize, updateCellEditor, updateDepthOffset, updateExpandedDescendants, updateLayoutCacheExpandedNodes, updateLeadSelectionRow, updateRenderer, updateSize

Methods inherited from class ComponentUI

contains, getAccessibleChild, getAccessibleChildrenCount, update

Methods inherited from class Object

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

Constructor Details

MetalTreeUI

public MetalTreeUI()

Constructs the MetalTreeUI.

Method Details

createUI

public static ComponentUI createUI(JComponent x)

Constructs the MetalTreeUI.

Parameters:

x - a component

Returns:

the instance of the MetalTreeUI

getHorizontalLegBuffer

protected int getHorizontalLegBuffer()

Description copied from class: BasicTreeUI

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.

Overrides:

getHorizontalLegBuffer in class BasicTreeUI

Returns:

the horizontal leg buffer

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 BasicTreeUI

Parameters:

c - the component where this UI delegate is being installed

See Also:

• ComponentUI.uninstallUI(JComponent)
• JComponent.setUI(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 BasicTreeUI

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(JComponent)
• JComponent.updateUI()

decodeLineStyle

protected void decodeLineStyle(Object lineStyleFlag)

Converts between the string passed into the client property and the internal representation (currently and int)

Parameters:

lineStyleFlag - a flag

isLocationInExpandControl

protected boolean isLocationInExpandControl(int row,
 int rowLevel,
 int mouseX,
 int mouseY)

Returns true if a point with X coordinate mouseX and Y coordinate mouseY is in expanded control.

Parameters:

row - a row

rowLevel - a row level

mouseX - X coordinate

mouseY - Y coordinate

Returns:

true if a point with X coordinate mouseX and Y coordinate mouseY is in expanded control.

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 BasicTreeUI

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(Graphics, JComponent)

paintHorizontalSeparators

protected void paintHorizontalSeparators(Graphics g,
 JComponent c)

Paints the horizontal separators.

Parameters:

g - an instance of Graphics

c - a component

paintVerticalPartOfLeg

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

Description copied from class: BasicTreeUI

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

Overrides:

paintVerticalPartOfLeg in class BasicTreeUI

Parameters:

g - a graphics context

clipBounds - a clipped rectangle

insets - insets

path - a tree path

paintHorizontalPartOfLeg

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

Description copied from class: BasicTreeUI

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.

Overrides:

paintHorizontalPartOfLeg in class BasicTreeUI

Parameters:

g - a graphics context

clipBounds - a clipped rectangle

insets - insets

bounds - a bounding rectangle

path - a tree path

row - a row

isExpanded - true if the path is expanded

hasBeenExpanded - true if the path has been expanded

isLeaf - true if the path is leaf