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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/interfaces 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)`
`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, getBaseline, getBaselineResizeBehavior, getCellEditor, getCellRenderer, getClosestPathForLocation, getCollapsedIcon, getEditingPath, getExpandedIcon, getHashColor, getLastChildPath, getLeftChildIndent, getMaximumSize, getMinimumSize, getModel, getPathBounds, getPathForRow, getPreferredMinSize, getPreferredSize, getPreferredSize, getRightChildIndent, getRowCount, getRowForPath, getRowHeight, getRowX, 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)

### 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 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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