# Class TreeTableView.TreeTableViewSelectionModel<S>

java.lang.Object
javafx.scene.control.SelectionModel<TreeItem<S>>
javafx.scene.control.MultipleSelectionModel<TreeItem<S>>
javafx.scene.control.TableSelectionModel<TreeItem<S>>
javafx.scene.control.TreeTableView.TreeTableViewSelectionModel<S>

Type Parameters:
  `S` - the type of the TreeItem instances used in this TreeTableView

Enclosing class:
  `TreeTableView<S>`

public abstract static class TreeTableView.TreeTableViewSelectionModel<S> extends TableSelectionModel<TreeItem<S>>
A simple extension of the `SelectionModel` abstract class to allow for special support for TreeTableView controls.

Since:
  JavaFX 8.0

- ## Property Summary

  ### Properties declared in class TableSelectionModel

  `cellSelectionEnabled`

  ### Properties declared in class MultipleSelectionModel

  `selectionMode`

  ### Properties declared in class SelectionModel

  `selectedIndex, selectedItem`

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `TreeTableViewSelectionModel(TreeTableView<S> treeTableView)`
  Builds a default TreeTableViewSelectionModel instance with the provided TreeTableView.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `void`
  `clearAndSelect(int row)`
  A method that clears any selection prior to setting the selection to the given index.
  `void`
  `clearSelection()`
  Clears the selection model of all selected indices.
  `void`
  `clearSelection(int index)`
  This method will clear the selection of the item in the given index.
  `void`
  `focus(int row)`
  Focuses the item at the given index.
  `int`
  `getFocusedIndex()`
  Gets the index of the focused item.
  `protected int`
  `getItemCount()`
  Returns the number of items in the data model that underpins the control.
  `TreeItem<S>`
  `getModelItem(int index)`
  Returns the item at the given index.
  `abstract ObservableList<TreeTablePosition<S,?>>`
  `getSelectedCells()`
  A read-only ObservableList representing the currently selected cells in this TreeTableView.
  `ObservableList<Integer>`
  `getSelectedIndices()`
  Returns a read-only ObservableList of all selected indices.
  `ObservableList<TreeItem<S>>`
  `getSelectedItems()`
  Returns a read-only ObservableList of all selected items.
  `TreeTableView<S>`
  `getTreeTableView()`
  Returns the TreeTableView instance that this selection model is installed in.
  `boolean`
  `isEmpty()`
  This method is available to test whether there are any selected indices/items.
  `boolean`
  `isSelected(int index)`
  This method tests whether the given index is currently selected in this SelectionModel.
  `void`
  `select(int row)`
  This will select the given index in the selection model, assuming the index is within the valid range (i.e.
  `void`
  `select(TreeItem<S> obj)`
  This method will attempt to select the index that contains the given object.
  `void`
  `selectAll()`
  Convenience method to select all available indices.
  `void`
  `selectFirst()`
  This method will attempt to select the first index in the control.
  `void`
  `selectIndices(int row, int... rows)`
  This method allows for one or more selections to be set at the same time.
  `void`
  `selectLast()`
  This method will attempt to select the last index in the control.
  `void`
  `selectNext()`
  This method will attempt to select the index directly after the current focused index.
  `void`
  `selectPrevious()`
  This method will attempt to select the index directly before the current focused index.
  `void`
  `selectRange(int minRow, TableColumnBase<TreeItem<S>, ?> minColumn, int maxRow, TableColumnBase<TreeItem<S>, ?> maxColumn)`
  Selects the cells in the range (minRow, minColumn) to (maxRow, maxColumn), inclusive.

  ### Methods declared in class TableSelectionModel

  `cellSelectionEnabledProperty, clearAndSelect, clearSelection, isCellSelectionEnabled, isSelected, select, selectAboveCell, selectBelowCell, selectLeftCell, selectRightCell, setCellSelectionEnabled`

  ### Methods declared in class MultipleSelectionModel

  `getSelectionMode, selectionModeProperty, selectRange, setSelectionMode`

  ### Methods declared in class SelectionModel

  `getSelectedIndex, getSelectedItem, selectedIndexProperty, selectedItemProperty, setSelectedIndex, setSelectedItem`

  ### Methods declared in class Object

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

- ## Constructor Details

  - ### TreeTableViewSelectionModel

    public TreeTableViewSelectionModel(TreeTableView<S> treeTableView)
    Builds a default TreeTableViewSelectionModel instance with the provided TreeTableView.
    Parameters:
      `treeTableView` - The TreeTableView upon which this selection model should operate.
    Throws:
      `NullPointerException` - TreeTableView can not be null.

- ## Method Details

  - ### getSelectedCells

    public abstract ObservableList<TreeTablePosition<S,?>> getSelectedCells()
    A read-only ObservableList representing the currently selected cells in this TreeTableView. Rather than directly modify this list, please use the other methods provided in the TreeTableViewSelectionModel.
    Returns:
      a list of selected cells

  - ### getTreeTableView

    public TreeTableView<S> getTreeTableView()
    Returns the TreeTableView instance that this selection model is installed in.
    Returns:
      the TreeTableView instance that this selection model is installed in

  - ### getModelItem

    public TreeItem<S> getModelItem(int index)
    Returns the item at the given index. An example using ListView would be `listView.getItems().get(index)`.
    Parameters:
      `index` - The index of the item that is requested from the underlying data model.
    Returns:
      Returns null if the index is out of bounds, or an element of type T that is related to the given index.

  - ### getItemCount

    protected int getItemCount()
    Returns the number of items in the data model that underpins the control. An example would be that a ListView selection model would likely return `listView.getItems().size()`. The valid range of selectable indices is between 0 and whatever is returned by this method.
    Returns:
      the number of items in the data model that underpins the control

  - ### focus

    public void focus(int row)
    Focuses the item at the given index.
    Parameters:
      `row` - the index of the item to be focused

  - ### getFocusedIndex

    public int getFocusedIndex()
    Gets the index of the focused item.
    Returns:
      the index of the focused item

  - ### selectRange

    public void selectRange(int minRow, TableColumnBase<TreeItem<S>, ?> minColumn, int maxRow, TableColumnBase<TreeItem<S>, ?> maxColumn)
    Selects the cells in the range (minRow, minColumn) to (maxRow, maxColumn), inclusive.
    Specified by:
      `selectRange` in class `TableSelectionModel<TreeItem<S>>`
    Parameters:
      `minRow` - the minRow
      `minColumn` - the minColumn
      `maxRow` - the maxRow
      `maxColumn` - the maxColumn

  - ### getSelectedIndices

    public ObservableList<Integer> getSelectedIndices()
    Description copied from class: `MultipleSelectionModel`

    Returns a read-only ObservableList of all selected indices. The ObservableList will be updated by the selection model to always reflect changes in selection. This can be observed by adding a `ListChangeListener` to the returned ObservableList.

    Specified by:
      `getSelectedIndices` in class `MultipleSelectionModel<T>`
    Returns:
      the list of selected indices

  - ### getSelectedItems

    public ObservableList<TreeItem<S>> getSelectedItems()
    Description copied from class: `MultipleSelectionModel`

    Returns a read-only ObservableList of all selected items. The ObservableList will be updated further by the selection model to always reflect changes in selection. This can be observed by adding a `ListChangeListener` to the returned ObservableList.

    Specified by:
      `getSelectedItems` in class `MultipleSelectionModel<T>`
    Returns:
      the list of selected items

  - ### clearAndSelect

    public void clearAndSelect(int row)
    Description copied from class: `SelectionModel`
    A method that clears any selection prior to setting the selection to the given index. The purpose of this method is to avoid having to call `SelectionModel.clearSelection()` first, meaning that observers that are listening to the `selected index` property will not see the selected index being temporarily set to -1.
    Specified by:
      `clearAndSelect` in class `SelectionModel<T>`
    Parameters:
      `row` - The index that should be the only selected index in this selection model.

  - ### select

    public void select(int row)
    Description copied from class: `SelectionModel`

    This will select the given index in the selection model, assuming the index is within the valid range (i.e. greater than or equal to zero, and less than the total number of items in the underlying data model).

    If there is already one or more indices selected in this model, calling this method will not clear these selections - to do so it is necessary to first call `SelectionModel.clearSelection()`.

    If the index is already selected, it will not be selected again, or unselected. However, if multiple selection is implemented, then calling select on an already selected index will have the effect of making the index the new selected index (as returned by `SelectionModel.getSelectedIndex()`.

    Specified by:
      `select` in class `SelectionModel<T>`
    Parameters:
      `row` - The position of the item to select in the selection model.

  - ### select

    public void select(TreeItem<S> obj)
    Description copied from class: `SelectionModel`

    This method will attempt to select the index that contains the given object. It will iterate through the underlying data model until it finds an item whose value is equal to the given object. At this point it will stop iterating - this means that this method will not select multiple indices.

    Specified by:
      `select` in class `SelectionModel<T>`
    Parameters:
      `obj` - The object to attempt to select in the underlying data model.

  - ### selectIndices

    public void selectIndices(int row, int... rows)
    Description copied from class: `MultipleSelectionModel`

    This method allows for one or more selections to be set at the same time. It will ignore any value that is not within the valid range (i.e. greater than or equal to zero, and less than the total number of items in the underlying data model). Any duplication of indices will be ignored.

    If there is already one or more indices selected in this model, calling this method will not clear these selections - to do so it is necessary to first call clearSelection.

    The last valid value given will become the selected index / selected item.

    Specified by:
      `selectIndices` in class `MultipleSelectionModel<T>`
    Parameters:
      `row` - the first index to select
      `rows` - zero or more additional indices to select

  - ### selectAll

    public void selectAll()
    Description copied from class: `MultipleSelectionModel`

    Convenience method to select all available indices.

    Specified by:
      `selectAll` in class `MultipleSelectionModel<T>`

  - ### selectFirst

    public void selectFirst()
    Description copied from class: `MultipleSelectionModel`

    This method will attempt to select the first index in the control. If clearSelection is not called first, this method will have the result of selecting the first index, whilst retaining the selection of any other currently selected indices.

    If the first index is already selected, calling this method will have no result, and no selection event will take place.

    Specified by:
      `selectFirst` in class `MultipleSelectionModel<T>`

  - ### selectLast

    public void selectLast()
    Description copied from class: `MultipleSelectionModel`

    This method will attempt to select the last index in the control. If clearSelection is not called first, this method will have the result of selecting the last index, whilst retaining the selection of any other currently selected indices.

    If the last index is already selected, calling this method will have no result, and no selection event will take place.

    Specified by:
      `selectLast` in class `MultipleSelectionModel<T>`

  - ### clearSelection

    public void clearSelection(int index)
    Description copied from class: `SelectionModel`

    This method will clear the selection of the item in the given index. If the given index is not selected, nothing will happen.

    Specified by:
      `clearSelection` in class `SelectionModel<T>`
    Parameters:
      `index` - The selected item to deselect.

  - ### clearSelection

    public void clearSelection()
    Description copied from class: `SelectionModel`

    Clears the selection model of all selected indices.

    Specified by:
      `clearSelection` in class `SelectionModel<T>`

  - ### isSelected

    public boolean isSelected(int index)
    Description copied from class: `SelectionModel`
    This method tests whether the given index is currently selected in this SelectionModel.
    Specified by:
      `isSelected` in class `SelectionModel<T>`
    Parameters:
      `index` - The index to check as to whether it is currently selected or not.
    Returns:
      True if the given index is selected, false otherwise.

  - ### isEmpty

    public boolean isEmpty()
    Description copied from class: `SelectionModel`
    This method is available to test whether there are any selected indices/items. It will return true if there are no selected items, and false if there are.
    Specified by:
      `isEmpty` in class `SelectionModel<T>`
    Returns:
      Will return true if there are no selected items, and false if there are.

  - ### selectPrevious

    public void selectPrevious()
    Description copied from class: `SelectionModel`

    This method will attempt to select the index directly before the current focused index. If clearSelection is not called first, this method will have the result of selecting the previous index, whilst retaining the selection of any other currently selected indices.

    Calling this method will only succeed if:

    - There is currently a lead/focused index.
    - The lead/focus index is not the first index in the control.
    - The previous index is not already selected.

    If any of these conditions is false, no selection event will take place.

    Specified by:
      `selectPrevious` in class `SelectionModel<T>`

  - ### selectNext

    public void selectNext()
    Description copied from class: `SelectionModel`

    This method will attempt to select the index directly after the current focused index. If clearSelection is not called first, this method will have the result of selecting the next index, whilst retaining the selection of any other currently selected indices.

    Calling this method will only succeed if:

    - There is currently a lead/focused index.
    - The lead/focus index is not the last index in the control.
    - The next index is not already selected.

    If any of these conditions is false, no selection event will take place.

    Specified by:
      `selectNext` in class `SelectionModel<T>`