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## javax.swing.plaf.metal
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:

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 impratical 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 inherited from class javax.swing.plaf.basic.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 javax.swing.plaf.basic.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
`MetalTreeUI()`

Method Summary
`static ComponentUI` | `createUI(JComponent x)` Returns an instance of the UI delegate for the specified component.
`protected void` | `decodeLineStyle(Object lineStyleFlag)` this function 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 appropriate for the look and feel.
`protected boolean` | `isLocationInExpandControl(int row, int rowLevel, int mouseX, int mouseY)`
`void` | `paint(Graphics g, JComponent c)` Paints the specified component appropriate 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)`
`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 javax.swing.plaf.basic.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, getCellEditor, getCellRenderer, getClosestPathForLocation, getCollapsedIcon, getEditingPath, getExpandedIcon, getHashColor, getLastChildPath, getLeftChildIndent, getMaximumSize, getMinimumSize, getModel, getPathBounds, getPathForRow, getPreferredMinSize, getPreferredSize, getPreferredSize, getRightChildIndent, getRowCount, getRowForPath, getRowHeight, getSelectionModel, getShowsRootHandles, getVerticalLegBuffer, handleExpandControlClick, installComponents, installDefaults, installKeyboardActions, installListeners, isEditable, isEditing, isLargeModel, isLeaf, isLocationInExpandControl, isMultiSelectEvent, isRootVisible, isToggleEvent, isToggleSelectionEvent, 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, updateRenderer, updateSize`

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`

Constructor Detail

### MetalTreeUI

    public MetalTreeUI()

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.

### 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`

### 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 `BasicTreeUI`
  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 `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(javax.swing.JComponent)`, `JComponent.updateUI()`

### decodeLineStyle

    protected void decodeLineStyle(Object lineStyleFlag)

  this function converts between the string passed into the client property and the internal representation (currently and int)

### isLocationInExpandControl

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

### 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 `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(java.awt.Graphics, javax.swing.JComponent)`

### paintHorizontalSeparators

    protected void paintHorizontalSeparators(Graphics g,
                                             JComponent c)

### 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`

### 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`

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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

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