javafx.scene.control.TableColumn Maven / Gradle / Ivy
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package javafx.scene.control;
import com.sun.javafx.scene.control.Properties;
import javafx.scene.control.skin.NestedTableColumnHeader;
import javafx.scene.control.skin.TableColumnHeader;
import javafx.scene.control.skin.TableHeaderRow;
import javafx.scene.control.skin.TableViewSkin;
import javafx.beans.property.ObjectProperty;
import javafx.beans.property.SimpleObjectProperty;
import javafx.collections.FXCollections;
import javafx.collections.ListChangeListener;
import javafx.collections.ObservableList;
import javafx.css.CssMetaData;
import javafx.css.Styleable;
import javafx.event.Event;
import javafx.event.EventHandler;
import javafx.event.EventTarget;
import javafx.event.EventType;
import javafx.scene.Node;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.util.Callback;
import javafx.collections.WeakListChangeListener;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import javafx.beans.property.ReadOnlyObjectProperty;
import javafx.beans.property.ReadOnlyObjectWrapper;
import javafx.beans.value.ObservableValue;
import javafx.beans.value.WritableValue;
/**
* A {@link TableView} is made up of a number of TableColumn instances. Each
* TableColumn in a table is responsible for displaying (and editing) the contents
* of that column. As well as being responsible for displaying and editing data
* for a single column, a TableColumn also contains the necessary properties to:
*
* - Be resized (using {@link #minWidthProperty() minWidth}/{@link #prefWidthProperty() prefWidth}/{@link #maxWidthProperty() maxWidth}
* and {@link #widthProperty() width} properties)
*
- Have its {@link #visibleProperty() visibility} toggled
*
- Display {@link #textProperty() header text}
*
- Display any {@link #getColumns() nested columns} it may contain
*
- Have a {@link #contextMenuProperty() context menu} when the user
* right-clicks the column header area
*
- Have the contents of the table be sorted (using
* {@link #comparatorProperty() comparator}, {@link #sortableProperty() sortable} and
* {@link #sortTypeProperty() sortType})
*
*
* When creating a TableColumn instance, perhaps the two most important properties
* to set are the column {@link #textProperty() text} (what to show in the column
* header area), and the column {@link #cellValueFactoryProperty() cell value factory}
* (which is used to populate individual cells in the column). This can be
* achieved using some variation on the following code:
*
*
* {@code
* ObservableList data = ...
* TableView tableView = new TableView(data);
*
* TableColumn firstNameCol = new TableColumn("First Name");
* firstNameCol.setCellValueFactory(new Callback, ObservableValue>() {
* public ObservableValue call(CellDataFeatures p) {
* // p.getValue() returns the Person instance for a particular TableView row
* return p.getValue().firstNameProperty();
* }
* });
* }
* tableView.getColumns().add(firstNameCol);}
*
* This approach assumes that the object returned from p.getValue()
* has a JavaFX {@link ObservableValue} that can simply be returned. The benefit of this
* is that the TableView will internally create bindings to ensure that,
* should the returned {@link ObservableValue} change, the cell contents will be
* automatically refreshed.
*
* In situations where a TableColumn must interact with classes created before
* JavaFX, or that generally do not wish to use JavaFX apis for properties, it is
* possible to wrap the returned value in a {@link ReadOnlyObjectWrapper} instance. For
* example:
*
*
* {@code
* firstNameCol.setCellValueFactory(new Callback, ObservableValue>() {
* public ObservableValue call(CellDataFeatures p) {
* return new ReadOnlyObjectWrapper(p.getValue().getFirstName());
* }
* });}
*
* It is hoped that over time there will be convenience cell value factories
* developed and made available to developers. As of the JavaFX 2.0 release,
* there is one such convenience class: {@link PropertyValueFactory}. This class
* removes the need to write the code above, instead relying on reflection to
* look up a given property from a String. Refer to the
* PropertyValueFactory class documentation for more information
* on how to use this with a TableColumn.
*
* Finally, for more detail on how to use TableColumn, there is further documentation in
* the {@link TableView} class documentation.
*
* @param The type of the TableView generic type (i.e. S == TableView<S>)
* @param The type of the content in all cells in this TableColumn.
* @see TableView
* @see TableCell
* @see TablePosition
* @since JavaFX 2.0
*/
public class TableColumn extends TableColumnBase implements EventTarget {
/* *************************************************************************
* *
* Static properties and methods *
* *
**************************************************************************/
/**
* Parent event for any TableColumn edit event.
* @param The type of the TableView generic type
* @param The type of the content in all cells in this TableColumn
* @return The any TableColumn edit event
*/
@SuppressWarnings("unchecked")
public static EventType> editAnyEvent() {
return (EventType>) EDIT_ANY_EVENT;
}
private static final EventType EDIT_ANY_EVENT =
new EventType<>(Event.ANY, "TABLE_COLUMN_EDIT");
/**
* Indicates that the user has performed some interaction to start an edit
* event, or alternatively the {@link TableView#edit(int, javafx.scene.control.TableColumn)}
* method has been called.
* @param The type of the TableView generic type
* @param The type of the content in all cells in this TableColumn
* @return The start an edit event
*/
@SuppressWarnings("unchecked")
public static EventType> editStartEvent() {
return (EventType>) EDIT_START_EVENT;
}
private static final EventType EDIT_START_EVENT =
new EventType<>(editAnyEvent(), "EDIT_START");
/**
* Indicates that the editing has been canceled, meaning that no change should
* be made to the backing data source.
* @param The type of the TableView generic type
* @param The type of the content in all cells in this TableColumn
* @return The cancel an edit event
*/
@SuppressWarnings("unchecked")
public static EventType> editCancelEvent() {
return (EventType>) EDIT_CANCEL_EVENT;
}
private static final EventType EDIT_CANCEL_EVENT =
new EventType<>(editAnyEvent(), "EDIT_CANCEL");
/**
* Indicates that the editing has been committed by the user, meaning that
* a change should be made to the backing data source to reflect the new
* data.
* @param The type of the TableView generic type
* @param The type of the content in all cells in this TableColumn
* @return The commit an edit event
*/
@SuppressWarnings("unchecked")
public static EventType> editCommitEvent() {
return (EventType>) EDIT_COMMIT_EVENT;
}
private static final EventType EDIT_COMMIT_EVENT =
new EventType<>(editAnyEvent(), "EDIT_COMMIT");
/**
* If no cellFactory is specified on a TableColumn instance, then this one
* will be used by default. At present it simply renders the TableCell item
* property within the {@link TableCell#graphicProperty() graphic} property
* if the {@link Cell#item item} is a Node, or it simply calls
* toString() if it is not null, setting the resulting string
* inside the {@link Cell#textProperty() text} property.
*/
public static final Callback, TableCell> DEFAULT_CELL_FACTORY =
new Callback<>() {
@Override public TableCell call(TableColumn param) {
return new TableCell<>() {
@Override protected void updateItem(Object item, boolean empty) {
if (item == getItem()) return;
super.updateItem(item, empty);
if (item == null) {
super.setText(null);
super.setGraphic(null);
} else if (item instanceof Node) {
super.setText(null);
super.setGraphic((Node)item);
} else {
super.setText(item.toString());
super.setGraphic(null);
}
}
};
}
};
/* *************************************************************************
* *
* Constructors *
* *
**************************************************************************/
/**
* Creates a default TableColumn with default cell factory, comparator, and
* onEditCommit implementation.
*/
public TableColumn() {
getStyleClass().add(DEFAULT_STYLE_CLASS);
setOnEditCommit(DEFAULT_EDIT_COMMIT_HANDLER);
// we listen to the columns list here to ensure that widths are
// maintained properly, and to also set the column hierarchy such that
// all children columns know that this TableColumn is their parent.
getColumns().addListener(weakColumnsListener);
tableViewProperty().addListener(observable -> {
// set all children of this tableView to have the same TableView
// as this column
for (TableColumn tc : getColumns()) {
tc.setTableView(getTableView());
}
// This code was commented out due to RT-22391, with this enabled
// the parent column will be null, which is not desired
// // set the parent of this column to also have this tableView
// if (getParentColumn() != null) {
// getParentColumn().setTableView(getTableView());
// }
});
}
/**
* Creates a TableColumn with the text set to the provided string, with
* default cell factory, comparator, and onEditCommit implementation.
* @param text The string to show when the TableColumn is placed within the TableView.
*/
public TableColumn(String text) {
this();
setText(text);
}
/* *************************************************************************
* *
* Listeners *
* *
**************************************************************************/
private EventHandler> DEFAULT_EDIT_COMMIT_HANDLER = t -> {
int index = t.getTablePosition() != null ? t.getTablePosition().getRow() : -1;
List list = t.getTableView() != null ? t.getTableView().getItems() : null;
if (list == null || index < 0 || index >= list.size()) return;
S rowData = list.get(index);
ObservableValue ov = getCellObservableValue(rowData);
if (ov instanceof WritableValue) {
((WritableValue)ov).setValue(t.getNewValue());
}
};
private ListChangeListener> columnsListener = c -> {
while (c.next()) {
// update the TableColumn.tableView property
for (TableColumn tc : c.getRemoved()) {
// Fix for RT-16978. In TableColumnHeader we add before we
// remove when moving a TableColumn. This means that for
// a very brief moment the tc is duplicated, and we can prevent
// nulling out the tableview and parent column. Without this
// here, in a very special circumstance it is possible to null
// out the entire content of a column by reordering and then
// sorting another column.
if (getColumns().contains(tc)) continue;
tc.setTableView(null);
tc.setParentColumn(null);
}
for (TableColumn tc : c.getAddedSubList()) {
tc.setTableView(getTableView());
}
updateColumnWidths();
}
};
private WeakListChangeListener> weakColumnsListener =
new WeakListChangeListener<>(columnsListener);
/* *************************************************************************
* *
* Instance Variables *
* *
**************************************************************************/
// Contains any children columns that should be nested within this column
private final ObservableList> columns = FXCollections.>observableArrayList();
/* *************************************************************************
* *
* Properties *
* *
**************************************************************************/
// --- TableView
/**
* The TableView that this TableColumn belongs to.
*/
private ReadOnlyObjectWrapper> tableView = new ReadOnlyObjectWrapper<>(this, "tableView");
public final ReadOnlyObjectProperty> tableViewProperty() {
return tableView.getReadOnlyProperty();
}
final void setTableView(TableView value) { tableView.set(value); }
public final TableView getTableView() { return tableView.get(); }
// --- Cell value factory
/**
* The cell value factory needs to be set to specify how to populate all
* cells within a single TableColumn. A cell value factory is a {@link Callback}
* that provides a {@link CellDataFeatures} instance, and expects an
* {@link ObservableValue} to be returned. The returned ObservableValue instance
* will be observed internally to allow for immediate updates to the value
* to be reflected on screen.
*
* An example of how to set a cell value factory is:
*
*
* lastNameCol.setCellValueFactory(new Callback<CellDataFeatures<Person, String>, ObservableValue<String>>() {
* public ObservableValue<String> call(CellDataFeatures<Person, String> p) {
* // p.getValue() returns the Person instance for a particular TableView row
* return p.getValue().lastNameProperty();
* }
* });
* }
*
*
* A common approach is to want to populate cells in a TableColumn using
* a single value from a Java bean. To support this common scenario, there
* is the {@link PropertyValueFactory} class. Refer to this class for more
* information on how to use it, but briefly here is how the above use case
* could be simplified using the PropertyValueFactory class:
*
*
* lastNameCol.setCellValueFactory(new PropertyValueFactory<Person,String>("lastName"));
*
*
* @see PropertyValueFactory
*/
private ObjectProperty, ObservableValue>> cellValueFactory;
public final void setCellValueFactory(Callback, ObservableValue> value) {
cellValueFactoryProperty().set(value);
}
public final Callback, ObservableValue> getCellValueFactory() {
return cellValueFactory == null ? null : cellValueFactory.get();
}
public final ObjectProperty, ObservableValue>> cellValueFactoryProperty() {
if (cellValueFactory == null) {
cellValueFactory = new SimpleObjectProperty<>(this, "cellValueFactory");
}
return cellValueFactory;
}
// --- Cell Factory
/**
* The cell factory for all cells in this column. The cell factory
* is responsible for rendering the data contained within each {@code TableCell} for
* a single table column.
*
* By default, {@code TableColumn} uses the {@link #DEFAULT_CELL_FACTORY default cell
* factory}, but this can be replaced with a custom implementation, for
* example, to show data in a different way or to support editing. There is a
* lot of documentation on creating custom cell factories
* elsewhere (see {@link Cell} and {@link TableView} for example).
*
* Finally, there are a number of pre-built cell factories available in the
* {@link javafx.scene.control.cell} package.
*/
private final ObjectProperty, TableCell>> cellFactory =
new SimpleObjectProperty<>(
this, "cellFactory", ((Callback) DEFAULT_CELL_FACTORY)) {
@Override protected void invalidated() {
TableView table = getTableView();
if (table == null) return;
Map properties = table.getProperties();
if (properties.containsKey(Properties.RECREATE)) {
properties.remove(Properties.RECREATE);
}
properties.put(Properties.RECREATE, Boolean.TRUE);
}
};
public final void setCellFactory(Callback, TableCell> value) {
cellFactory.set(value);
}
public final Callback, TableCell> getCellFactory() {
return cellFactory.get();
}
public final ObjectProperty, TableCell>> cellFactoryProperty() {
return cellFactory;
}
// --- Sort Type
/**
* Used to state whether this column, if it is part of a sort order (see
* {@link TableView#getSortOrder()} for more details), should be sorted in
* ascending or descending order.
* Simply toggling this property will result in the sort order changing in
* the TableView, assuming of course that this column is in the
* sortOrder ObservableList to begin with.
*/
private ObjectProperty sortType;
public final ObjectProperty sortTypeProperty() {
if (sortType == null) {
sortType = new SimpleObjectProperty<>(this, "sortType", SortType.ASCENDING);
}
return sortType;
}
public final void setSortType(SortType value) {
sortTypeProperty().set(value);
}
public final SortType getSortType() {
return sortType == null ? SortType.ASCENDING : sortType.get();
}
// --- On Edit Start
private ObjectProperty>> onEditStart;
public final void setOnEditStart(EventHandler> value) {
onEditStartProperty().set(value);
}
public final EventHandler> getOnEditStart() {
return onEditStart == null ? null : onEditStart.get();
}
/**
* This event handler will be fired when the user successfully initiates
* editing.
* @return the on edit start property
*/
public final ObjectProperty>> onEditStartProperty() {
if (onEditStart == null) {
onEditStart = new SimpleObjectProperty<>(this, "onEditStart") {
@Override protected void invalidated() {
eventHandlerManager.setEventHandler(TableColumn.editStartEvent(), get());
}
};
}
return onEditStart;
}
// --- On Edit Commit
private ObjectProperty>> onEditCommit;
public final void setOnEditCommit(EventHandler> value) {
onEditCommitProperty().set(value);
}
public final EventHandler> getOnEditCommit() {
return onEditCommit == null ? null : onEditCommit.get();
}
/**
* This event handler will be fired when the user successfully commits their
* editing.
* @return the on edit commit property
*/
public final ObjectProperty>> onEditCommitProperty() {
if (onEditCommit == null) {
onEditCommit = new SimpleObjectProperty<>(this, "onEditCommit") {
@Override protected void invalidated() {
eventHandlerManager.setEventHandler(TableColumn.editCommitEvent(), get());
}
};
}
return onEditCommit;
}
// --- On Edit Cancel
private ObjectProperty>> onEditCancel;
public final void setOnEditCancel(EventHandler> value) {
onEditCancelProperty().set(value);
}
public final EventHandler> getOnEditCancel() {
return onEditCancel == null ? null : onEditCancel.get();
}
/**
* This event handler will be fired when the user cancels editing a cell.
* @return the on edit cancel property
*/
public final ObjectProperty>> onEditCancelProperty() {
if (onEditCancel == null) {
onEditCancel = new SimpleObjectProperty<>(this, "onEditCancel") {
@Override protected void invalidated() {
eventHandlerManager.setEventHandler(TableColumn.editCancelEvent(), get());
}
};
}
return onEditCancel;
}
/* *************************************************************************
* *
* Public API *
* *
**************************************************************************/
/** {@inheritDoc} */
@Override public final ObservableList> getColumns() {
return columns;
}
/** {@inheritDoc} */
@Override public final ObservableValue getCellObservableValue(int index) {
if (index < 0) return null;
// Get the table
final TableView table = getTableView();
if (table == null || table.getItems() == null) return null;
// Get the rowData
final List items = table.getItems();
if (index >= items.size()) return null; // Out of range
final S rowData = items.get(index);
return getCellObservableValue(rowData);
}
/** {@inheritDoc} */
@Override public final ObservableValue getCellObservableValue(S item) {
// Get the factory
final Callback, ObservableValue> factory = getCellValueFactory();
if (factory == null) return null;
// Get the table
final TableView table = getTableView();
if (table == null) return null;
// Call the factory
final CellDataFeatures cdf = new CellDataFeatures<>(table, this, item);
return factory.call(cdf);
}
/* *************************************************************************
* *
* Stylesheet Handling *
* *
**************************************************************************/
private static final String DEFAULT_STYLE_CLASS = "table-column";
/**
* {@inheritDoc}
* @return "TableColumn"
* @since JavaFX 8.0
*/
@Override
public String getTypeSelector() {
return "TableColumn";
}
/**
* {@inheritDoc}
* @return {@code getTableView()}
* @since JavaFX 8.0
*/
@Override
public Styleable getStyleableParent() {
return getTableView(); }
/**
* {@inheritDoc}
* @since JavaFX 8.0
*/
@Override
public List> getCssMetaData() {
return getClassCssMetaData();
}
/**
* Gets the {@code CssMetaData} associated with this class, which may include the
* {@code CssMetaData} of its superclasses.
* @return the {@code CssMetaData}
* @since JavaFX 8.0
*/
public static List> getClassCssMetaData() {
return Collections.emptyList();
}
/** {@inheritDoc} */
@Override public Node getStyleableNode() {
if (! (getTableView().getSkin() instanceof TableViewSkin)) return null;
TableViewSkin skin = (TableViewSkin) getTableView().getSkin();
TableHeaderRow tableHeader = null;
for (Node n : skin.getChildren()) {
if (n instanceof TableHeaderRow) {
tableHeader = (TableHeaderRow)n;
}
}
NestedTableColumnHeader rootHeader = null;
for (Node n : tableHeader.getChildren()) {
if (n instanceof NestedTableColumnHeader) {
rootHeader = (NestedTableColumnHeader) n;
}
}
// we now need to do a search for the header. We'll go depth-first.
return scan(rootHeader);
}
private TableColumnHeader scan(TableColumnHeader header) {
// firstly test that the parent isn't what we are looking for
if (TableColumn.this.equals(header.getTableColumn())) {
return header;
}
if (header instanceof NestedTableColumnHeader) {
NestedTableColumnHeader parent = (NestedTableColumnHeader) header;
for (int i = 0; i < parent.getColumnHeaders().size(); i++) {
TableColumnHeader result = scan(parent.getColumnHeaders().get(i));
if (result != null) {
return result;
}
}
}
return null;
}
/* *************************************************************************
* *
* Support Interfaces *
* *
**************************************************************************/
/**
* A support class used in TableColumn as a wrapper class
* to provide all necessary information for a particular {@link Cell}. Once
* instantiated, this class is immutable.
*
* @param The TableView type
* @param The TableColumn type
* @since JavaFX 2.0
*/
public static class CellDataFeatures {
private final TableView tableView;
private final TableColumn tableColumn;
private final S value;
/**
* Instantiates a CellDataFeatures instance with the given properties
* set as read-only values of this instance.
*
* @param tableView The TableView that this instance refers to.
* @param tableColumn The TableColumn that this instance refers to.
* @param value The value for a row in the TableView.
*/
public CellDataFeatures(TableView tableView,
TableColumn tableColumn, S value) {
this.tableView = tableView;
this.tableColumn = tableColumn;
this.value = value;
}
/**
* Returns the value passed in to the constructor.
* @return the value passed in to the constructor
*/
public S getValue() {
return value;
}
/**
* Returns the {@link TableColumn} passed in to the constructor.
* @return the TableColumn passed in to the constructor
*/
public TableColumn getTableColumn() {
return tableColumn;
}
/**
* Returns the {@link TableView} passed in to the constructor.
* @return the TableView passed in to the constructor
*/
public TableView getTableView() {
return tableView;
}
}
/**
* An event that is fired when a user performs an edit on a table cell.
* @param The type of the TableView generic type
* @param The type of the content in all cells in this TableColumn
* @since JavaFX 2.0
*/
public static class CellEditEvent extends Event {
private static final long serialVersionUID = -609964441682677579L;
/**
* Common supertype for all cell edit event types.
* @since JavaFX 8.0
*/
public static final EventType ANY = EDIT_ANY_EVENT;
// represents the new value input by the end user. This is NOT the value
// to go back into the TableView.items list - this new value represents
// just the input for a single cell, so it is likely that it needs to go
// back into a property within an item in the TableView.items list.
@SuppressWarnings("doclint:missing")
private final T newValue;
// The location of the edit event
private transient final TablePosition pos;
/**
* Creates a new event that can be subsequently fired to the relevant listeners.
*
* @param table The TableView on which this event occurred.
* @param pos The position upon which this event occurred.
* @param eventType The type of event that occurred.
* @param newValue The value input by the end user.
*/
public CellEditEvent(TableView table, TablePosition pos,
EventType> eventType, T newValue) {
super(table, Event.NULL_SOURCE_TARGET, eventType);
this.pos = pos;
this.newValue = newValue;
}
/**
* Returns the TableView upon which this event occurred.
* @return The TableView control upon which this event occurred.
*/
public TableView getTableView() {
return pos != null ? pos.getTableView() : null;
}
/**
* Returns the TableColumn upon which this event occurred.
*
* @return The TableColumn that the edit occurred in.
*/
public TableColumn getTableColumn() {
return pos != null ? pos.getTableColumn() : null;
}
/**
* Returns the position upon which this event occurred.
* @return The position upon which this event occurred.
*/
public TablePosition getTablePosition() {
return pos;
}
/**
* Returns the new value input by the end user. This is not the value
* to go back into the TableView.items list - this new value represents
* just the input for a single cell, so it is likely that it needs to go
* back into a property within an item in the TableView.items list.
*
* @return An Object representing the new value input by the user.
*/
public T getNewValue() {
return newValue;
}
/**
* Attempts to return the old value at the position referred to in the
* TablePosition returned by {@link #getTablePosition()}. This may return
* null for a number of reasons.
*
* @return Returns the value stored in the position being edited, or null
* if it can not be retrieved.
*/
public T getOldValue() {
S rowData = getRowValue();
if (rowData == null || pos.getTableColumn() == null) {
return null;
}
// if we are here, we now need to get the data for the specific column
return pos.getTableColumn().getCellData(rowData);
}
/**
* Convenience method that returns the value for the row (that is, from
* the TableView {@link TableView#itemsProperty() items} list), for the
* row contained within the {@link TablePosition} returned in
* {@link #getTablePosition()}.
* @return the value for the row
*/
public S getRowValue() {
List items = getTableView() != null ? getTableView().getItems() : null;
if (items == null) return null;
int row = pos != null ? pos.getRow() : -1;
if (row < 0 || row >= items.size()) return null;
return items.get(row);
}
}
/**
* Enumeration that specifies the type of sorting being applied to a specific
* column.
* @since JavaFX 2.0
*/
public static enum SortType {
/**
* Column will be sorted in an ascending order.
*/
ASCENDING,
/**
* Column will be sorted in a descending order.
*/
DESCENDING;
// UNSORTED
}
}