javafx.scene.control.ListView Maven / Gradle / Ivy
/*
* Copyright (c) 2010, 2023, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package javafx.scene.control;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import com.sun.javafx.scene.control.Properties;
import com.sun.javafx.scene.control.behavior.ListCellBehavior;
import javafx.beans.InvalidationListener;
import javafx.beans.Observable;
import javafx.beans.WeakInvalidationListener;
import javafx.beans.property.BooleanProperty;
import javafx.beans.property.DoubleProperty;
import javafx.beans.property.ObjectProperty;
import javafx.beans.property.ObjectPropertyBase;
import javafx.beans.property.ReadOnlyIntegerProperty;
import javafx.beans.property.ReadOnlyIntegerWrapper;
import javafx.beans.property.SimpleBooleanProperty;
import javafx.beans.property.SimpleObjectProperty;
import javafx.collections.FXCollections;
import javafx.collections.ListChangeListener;
import javafx.collections.ListChangeListener.Change;
import javafx.collections.MapChangeListener;
import javafx.collections.ObservableList;
import javafx.css.StyleableDoubleProperty;
import javafx.event.Event;
import javafx.event.EventHandler;
import javafx.event.EventType;
import javafx.geometry.Orientation;
import javafx.scene.layout.Region;
import javafx.util.Callback;
import javafx.css.StyleableObjectProperty;
import javafx.css.CssMetaData;
import javafx.css.converter.EnumConverter;
import javafx.collections.WeakListChangeListener;
import javafx.css.converter.SizeConverter;
import javafx.scene.control.skin.ListViewSkin;
import java.lang.ref.WeakReference;
import javafx.css.PseudoClass;
import javafx.beans.DefaultProperty;
import javafx.css.Styleable;
import javafx.css.StyleableProperty;
import javafx.scene.AccessibleAttribute;
import javafx.scene.AccessibleRole;
import javafx.scene.Node;
import javafx.util.Pair;
/**
* A ListView displays a horizontal or vertical list of items from which the
* user may select, or with which the user may interact. A ListView is able to
* have its generic type set to represent the type of data in the backing model.
* Doing this has the benefit of making various methods in the ListView, as well
* as the supporting classes (mentioned below), type-safe. In addition, making
* use of the generic type supports substantially simplified development of applications
* making use of ListView, as all modern IDEs are able to auto-complete far
* more successfully with the additional type information.
*
* Populating a ListView
* A simple example of how to create and populate a ListView of names (Strings)
* is shown here:
*
*
{@code ObservableList names = FXCollections.observableArrayList(
* "Julia", "Ian", "Sue", "Matthew", "Hannah", "Stephan", "Denise");
* ListView listView = new ListView(names);}
*
* The elements of the ListView are contained within the
* {@link #itemsProperty() items} {@link ObservableList}. This
* ObservableList is automatically observed by the ListView, such that any
* changes that occur inside the ObservableList will be automatically shown in
* the ListView itself. If passing the ObservableList in to the
* ListView constructor is not feasible, the recommended approach for setting
* the items is to simply call:
*
*
{@code ObservableList content = ...
* listView.setItems(content);}
*
* 
*
* The end result of this is, as noted above, that the ListView will automatically
* refresh the view to represent the items in the list.
*
*
Another approach, whilst accepted by the ListView, is not the
* recommended approach:
*
*
{@code List content = ...
* getItems().setAll(content);}
*
* The issue with the approach shown above is that the content list is being
* copied into the items list - meaning that subsequent changes to the content
* list are not observed, and will not be reflected visually within the ListView.
*
* ListView Selection / Focus APIs
* To track selection and focus, it is necessary to become familiar with the
* {@link SelectionModel} and {@link FocusModel} classes. A ListView has at most
* one instance of each of these classes, available from
* {@link #selectionModelProperty() selectionModel} and
* {@link #focusModelProperty() focusModel} properties respectively.
* Whilst it is possible to use this API to set a new selection model, in
* most circumstances this is not necessary - the default selection and focus
* models should work in most circumstances.
*
*
The default {@link SelectionModel} used when instantiating a ListView is
* an implementation of the {@link MultipleSelectionModel} abstract class.
* However, as noted in the API documentation for
* the {@link MultipleSelectionModel#selectionModeProperty() selectionMode}
* property, the default value is {@link SelectionMode#SINGLE}. To enable
* multiple selection in a default ListView instance, it is therefore necessary
* to do the following:
*
*
{@code listView.getSelectionModel().setSelectionMode(SelectionMode.MULTIPLE);}
*
* Customizing ListView Visuals
* The visuals of the ListView can be entirely customized by replacing the
* default {@link #cellFactoryProperty() cell factory}. A cell factory is used to
* generate {@link ListCell} instances, which are used to represent an item in the
* ListView. See the {@link Cell} class documentation for a more complete
* description of how to write custom Cells.
*
* Warning: Nodes should not be inserted directly into the items list
* {@code ListView} allows for the items list to contain elements of any type, including
* {@link Node} instances. Putting nodes into
* the items list is strongly discouraged, as it can
* lead to unexpected results.
* Important points to note:
*
* - Avoid inserting {@code Node} instances directly into the items list or its data model.
* - The recommended approach is to put the relevant information into the items list, and
* provide a custom {@link #cellFactoryProperty() cell factory} to create the nodes for a
* given cell and update them on demand using the data stored in the item for that cell.
* - Avoid creating new {@code Node}s in the {@code updateItem} method of a custom {@link #cellFactoryProperty() cell factory}.
*
* The following minimal example shows how to create a custom cell factory for {@code ListView} containing {@code Node}s:
*
*
{@code ListView lv = new ListView<>();
* lv.getItems().addAll(Color.RED, Color.GREEN, Color.BLUE);
*
* lv.setCellFactory(p -> {
* return new ListCell<>() {
* private final Rectangle rectangle;
* {
* setContentDisplay(ContentDisplay.GRAPHIC_ONLY);
* rectangle = new Rectangle(10, 10);
* }
*
* @Override
* protected void updateItem(Color item, boolean empty) {
* super.updateItem(item, empty);
*
* if (item == null || empty) {
* setGraphic(null);
* } else {
* rectangle.setFill(item);
* setGraphic(rectangle);
* }
* }
* };
* });}
* This example has an anonymous custom {@code ListCell} class in the custom cell factory.
* Note that the {@code Rectangle} ({@code Node}) object needs to be created in the instance initialization block
* or the constructor of the custom {@code ListCell} class and updated/used in its {@code updateItem} method.
*
*
Editing
* This control supports inline editing of values, and this section attempts to
* give an overview of the available APIs and how you should use them.
*
* Firstly, cell editing most commonly requires a different user interface
* than when a cell is not being edited. This is the responsibility of the
* {@link Cell} implementation being used. For ListView, this is the responsibility
* of the {@link #cellFactoryProperty() cell factory}. It is your choice whether the cell is
* permanently in an editing state (e.g. this is common for {@link CheckBox} cells),
* or to switch to a different UI when editing begins (e.g. when a double-click
* is received on a cell).
*
* To know when editing has been requested on a cell,
* simply override the {@link javafx.scene.control.Cell#startEdit()} method, and
* update the cell {@link javafx.scene.control.Cell#textProperty() text} and
* {@link javafx.scene.control.Cell#graphicProperty() graphic} properties as
* appropriate (e.g. set the text to null and set the graphic to be a
* {@link TextField}). Additionally, you should also override
* {@link Cell#cancelEdit()} to reset the UI back to its original visual state
* when the editing concludes. In both cases it is important that you also
* ensure that you call the super method to have the cell perform all duties it
* must do to enter or exit its editing mode.
*
* Once your cell is in an editing state, the next thing you are most probably
* interested in is how to commit or cancel the editing that is taking place. This is your
* responsibility as the cell factory provider. Your cell implementation will know
* when the editing is over, based on the user input (e.g. when the user presses
* the Enter or ESC keys on their keyboard). When this happens, it is your
* responsibility to call {@link Cell#commitEdit(Object)} or
* {@link Cell#cancelEdit()}, as appropriate.
*
* When you call {@link Cell#commitEdit(Object)} an event is fired to the
* ListView, which you can observe by adding an {@link EventHandler} via
* {@link ListView#setOnEditCommit(javafx.event.EventHandler)}. Similarly,
* you can also observe edit events for
* {@link ListView#setOnEditStart(javafx.event.EventHandler) edit start}
* and {@link ListView#setOnEditCancel(javafx.event.EventHandler) edit cancel}.
*
* By default the ListView edit commit handler is non-null, with a default
* handler that attempts to overwrite the property value for the
* item in the currently-being-edited row. It is able to do this as the
* {@link Cell#commitEdit(Object)} method is passed in the new value, and this
* is passed along to the edit commit handler via the
* {@link EditEvent} that is fired. It is simply a matter of calling
* {@link EditEvent#getNewValue()} to retrieve this value.
*
*
It is very important to note that if you call
* {@link ListView#setOnEditCommit(javafx.event.EventHandler)} with your own
* {@link EventHandler}, then you will be removing the default handler. Unless
* you then handle the writeback to the property (or the relevant data source),
* nothing will happen. You can work around this by using the
* {@link ListView#addEventHandler(javafx.event.EventType, javafx.event.EventHandler)}
* method to add a {@link ListView#editCommitEvent()} {@link EventType} with
* your desired {@link EventHandler} as the second argument. Using this method,
* you will not replace the default implementation, but you will be notified when
* an edit commit has occurred.
*
* Hopefully this summary answers some of the commonly asked questions.
* Fortunately, JavaFX ships with a number of pre-built cell factories that
* handle all the editing requirements on your behalf. You can find these
* pre-built cell factories in the javafx.scene.control.cell package.
*
* @see ListCell
* @see MultipleSelectionModel
* @see FocusModel
* @param This type is used to represent the type of the objects stored in
* the ListViews {@link #itemsProperty() items} ObservableList. It is
* also used in the {@link #selectionModelProperty() selection model}
* and {@link #focusModelProperty() focus model}.
* @since JavaFX 2.0
*/
// TODO add code examples
@DefaultProperty("items")
public class ListView extends Control {
/* *************************************************************************
* *
* Static properties and methods *
* *
**************************************************************************/
/**
* An EventType that indicates some edit event has occurred. It is the parent
* type of all other edit events: {@link #editStartEvent()},
* {@link #editCommitEvent()} and {@link #editCancelEvent()}.
* @param the type of the objects stored in this ListView
* @return the event type
*/
@SuppressWarnings("unchecked")
public static EventType> editAnyEvent() {
return (EventType>) EDIT_ANY_EVENT;
}
private static final EventType EDIT_ANY_EVENT =
new EventType<>(Event.ANY, "LIST_VIEW_EDIT");
/**
* An EventType used to indicate that an edit event has started within the
* ListView upon which the event was fired.
* @param the type of the objects stored in this ListView
* @return the event type
*/
@SuppressWarnings("unchecked")
public static EventType> editStartEvent() {
return (EventType>) EDIT_START_EVENT;
}
private static final EventType EDIT_START_EVENT =
new EventType<>(editAnyEvent(), "EDIT_START");
/**
* An EventType used to indicate that an edit event has just been canceled
* within the ListView upon which the event was fired.
* @param the type of the objects stored in this ListView
* @return the event type
*/
@SuppressWarnings("unchecked")
public static EventType> editCancelEvent() {
return (EventType>) EDIT_CANCEL_EVENT;
}
private static final EventType EDIT_CANCEL_EVENT =
new EventType<>(editAnyEvent(), "EDIT_CANCEL");
/**
* An EventType used to indicate that an edit event has been committed
* within the ListView upon which the event was fired.
* @param the type of the objects stored in this ListView
* @return the event type
*/
@SuppressWarnings("unchecked")
public static EventType> editCommitEvent() {
return (EventType>) EDIT_COMMIT_EVENT;
}
private static final EventType EDIT_COMMIT_EVENT =
new EventType<>(editAnyEvent(), "EDIT_COMMIT");
/* *************************************************************************
* *
* Fields *
* *
**************************************************************************/
// by default we always select the first row in the ListView, and when the
// items list changes, we also reselect the first row. In some cases, such as
// for the ComboBox, this is not desirable, so it can be disabled here.
private boolean selectFirstRowByDefault = true;
/* *************************************************************************
* *
* Constructors *
* *
**************************************************************************/
/**
* Creates a default ListView which will display contents stacked vertically.
* As no {@link ObservableList} is provided in this constructor, an empty
* ObservableList is created, meaning that it is legal to directly call
* {@link #getItems()} if so desired. However, as noted elsewhere, this
* is not the recommended approach
* (instead call {@link #setItems(javafx.collections.ObservableList)}).
*
* Refer to the {@link ListView} class documentation for details on the
* default state of other properties.
*/
public ListView() {
this(FXCollections.observableArrayList());
}
/**
* Creates a default ListView which will stack the contents retrieved from the
* provided {@link ObservableList} vertically.
*
* Attempts to add a listener to the {@link ObservableList}, such that all
* subsequent changes inside the list will be shown to the user.
*
*
Refer to the {@link ListView} class documentation for details on the
* default state of other properties.
* @param items the list of items
*/
public ListView(ObservableList items) {
getStyleClass().setAll(DEFAULT_STYLE_CLASS);
setAccessibleRole(AccessibleRole.LIST_VIEW);
setItems(items);
// Install default....
// ...selection model
setSelectionModel(new ListView.ListViewBitSetSelectionModel<>(this));
// ...focus model
setFocusModel(new ListView.ListViewFocusModel<>(this));
// ...edit commit handler
setOnEditCommit(DEFAULT_EDIT_COMMIT_HANDLER);
// Fix for RT-36651, which was introduced by RT-35679 (above) and resolved
// by having special-case code to remove the listener when requested.
// This is done by ComboBoxListViewSkin, so that selection is not done
// when a ComboBox is shown.
getProperties().addListener((MapChangeListener) change -> {
if (change.wasAdded() && "selectFirstRowByDefault".equals(change.getKey())) {
Boolean _selectFirstRowByDefault = (Boolean) change.getValueAdded();
if (_selectFirstRowByDefault == null) return;
selectFirstRowByDefault = _selectFirstRowByDefault;
}
});
pseudoClassStateChanged(PSEUDO_CLASS_VERTICAL, true);
}
/* *************************************************************************
* *
* Callbacks and Events *
* *
**************************************************************************/
private EventHandler> DEFAULT_EDIT_COMMIT_HANDLER = t -> {
int index = t.getIndex();
List list = getItems();
if (index < 0 || index >= list.size()) return;
list.set(index, t.getNewValue());
};
/* *************************************************************************
* *
* Properties *
* *
**************************************************************************/
// --- Items
private ObjectProperty> items;
/**
* Sets the underlying data model for the ListView. Note that it has a generic
* type that must match the type of the ListView itself.
* @param value the list of items for this ListView
*/
public final void setItems(ObservableList value) {
itemsProperty().set(value);
}
/**
* Returns an {@link ObservableList} that contains the items currently being
* shown to the user. This may be null if
* {@link #setItems(javafx.collections.ObservableList)} has previously been
* called, however, by default it is an empty ObservableList.
*
* @return An ObservableList containing the items to be shown to the user, or
* null if the items have previously been set to null.
*/
public final ObservableList getItems() {
return items == null ? null : items.get();
}
/**
* The underlying data model for the ListView. Note that it has a generic
* type that must match the type of the ListView itself.
* @return the items property for this ListView
*/
public final ObjectProperty> itemsProperty() {
if (items == null) {
items = new SimpleObjectProperty<>(this, "items");
}
return items;
}
/**
* The {@code Node} to show to the user when the {@code ListView} has no content to show.
* This happens when the list model has no data or when a filter has been applied to the list model, resulting in
* there being nothing to show the user.
*
* @since JavaFX 8.0
*/
private ObjectProperty placeholder;
public final ObjectProperty placeholderProperty() {
if (placeholder == null) {
placeholder = new SimpleObjectProperty<>(this, "placeholder");
}
return placeholder;
}
public final void setPlaceholder(Node value) {
placeholderProperty().set(value);
}
public final Node getPlaceholder() {
return placeholder == null ? null : placeholder.get();
}
// --- Selection Model
private ObjectProperty> selectionModel = new SimpleObjectProperty<>(this, "selectionModel");
/**
* Sets the {@link MultipleSelectionModel} to be used in the ListView.
* Despite a ListView requiring a MultipleSelectionModel, it is possible
* to configure it to only allow single selection (see
* {@link MultipleSelectionModel#setSelectionMode(javafx.scene.control.SelectionMode)}
* for more information).
* @param value the MultipleSelectionModel to be used in this ListView
*/
public final void setSelectionModel(MultipleSelectionModel value) {
selectionModelProperty().set(value);
}
/**
* Returns the currently installed selection model.
* @return the currently installed selection model
*/
public final MultipleSelectionModel getSelectionModel() {
return selectionModel == null ? null : selectionModel.get();
}
/**
* The SelectionModel provides the API through which it is possible
* to select single or multiple items within a ListView, as well as inspect
* which items have been selected by the user. Note that it has a generic
* type that must match the type of the ListView itself.
* @return the selectionModel property
*/
public final ObjectProperty> selectionModelProperty() {
return selectionModel;
}
// --- Focus Model
private ObjectProperty> focusModel;
/**
* Sets the {@link FocusModel} to be used in the ListView.
* @param value the FocusModel to be used in the ListView
*/
public final void setFocusModel(FocusModel value) {
focusModelProperty().set(value);
}
/**
* Returns the currently installed {@link FocusModel}.
* @return the currently installed FocusModel
*/
public final FocusModel getFocusModel() {
return focusModel == null ? null : focusModel.get();
}
/**
* The FocusModel provides the API through which it is possible
* to both get and set the focus on a single item within a ListView. Note
* that it has a generic type that must match the type of the ListView itself.
* @return the FocusModel property
*/
public final ObjectProperty> focusModelProperty() {
if (focusModel == null) {
focusModel = new SimpleObjectProperty<>(this, "focusModel");
}
return focusModel;
}
// --- Orientation
private ObjectProperty orientation;
/**
* Sets the orientation of the ListView, which dictates whether
* it scrolls vertically or horizontally.
* @param value the orientation of the ListView
*/
public final void setOrientation(Orientation value) {
orientationProperty().set(value);
}
/**
* Returns the current orientation of the ListView, which dictates whether
* it scrolls vertically or horizontally.
* @return the current orientation of the ListView
*/
public final Orientation getOrientation() {
return orientation == null ? Orientation.VERTICAL : orientation.get();
}
/**
* The orientation of the {@code ListView} - this can either be horizontal
* or vertical.
* @return the orientation property of this ListView
*/
public final ObjectProperty orientationProperty() {
if (orientation == null) {
orientation = new StyleableObjectProperty(Orientation.VERTICAL) {
@Override public void invalidated() {
final boolean active = (get() == Orientation.VERTICAL);
pseudoClassStateChanged(PSEUDO_CLASS_VERTICAL, active);
pseudoClassStateChanged(PSEUDO_CLASS_HORIZONTAL, !active);
}
@Override
public CssMetaData,Orientation> getCssMetaData() {
return ListView.StyleableProperties.ORIENTATION;
}
@Override
public Object getBean() {
return ListView.this;
}
@Override
public String getName() {
return "orientation";
}
};
}
return orientation;
}
// --- Cell Factory
private ObjectProperty, ListCell>> cellFactory;
/**
* Sets a new cell factory to use in the ListView. This forces all old
* {@link ListCell}'s to be thrown away, and new ListCell's created with
* the new cell factory.
* @param value cell factory to use in this ListView
*/
public final void setCellFactory(Callback, ListCell> value) {
cellFactoryProperty().set(value);
}
/**
* Returns the current cell factory.
* @return the current cell factory
*/
public final Callback, ListCell> getCellFactory() {
return cellFactory == null ? null : cellFactory.get();
}
/**
* Setting a custom cell factory has the effect of deferring all cell
* creation, allowing for total customization of the cell. Internally, the
* ListView is responsible for reusing ListCells - all that is necessary
* is for the custom cell factory to return from this function a ListCell
* which might be usable for representing any item in the ListView.
*
*
Refer to the {@link Cell} class documentation for more detail.
* @return the cell factory property
*/
public final ObjectProperty, ListCell>> cellFactoryProperty() {
if (cellFactory == null) {
cellFactory = new SimpleObjectProperty<>(this, "cellFactory");
}
return cellFactory;
}
// --- Fixed cell size
private DoubleProperty fixedCellSize;
/**
* Sets the new fixed cell size for this control. Any value greater than
* zero will enable fixed cell size mode, whereas a zero or negative value
* (or Region.USE_COMPUTED_SIZE) will be used to disabled fixed cell size
* mode.
*
* @param value The new fixed cell size value, or a value less than or equal
* to zero (or Region.USE_COMPUTED_SIZE) to disable.
* @since JavaFX 8.0
*/
public final void setFixedCellSize(double value) {
fixedCellSizeProperty().set(value);
}
/**
* Returns the fixed cell size value. A value less than or equal to zero is
* used to represent that fixed cell size mode is disabled, and a value
* greater than zero represents the size of all cells in this control.
*
* @return A double representing the fixed cell size of this control, or a
* value less than or equal to zero if fixed cell size mode is disabled.
* @since JavaFX 8.0
*/
public final double getFixedCellSize() {
return fixedCellSize == null ? Region.USE_COMPUTED_SIZE : fixedCellSize.get();
}
/**
* Specifies whether this control has cells that are a fixed height (of the
* specified value). If this value is less than or equal to zero,
* then all cells are individually sized and positioned. This is a slow
* operation. Therefore, when performance matters and developers are not
* dependent on variable cell sizes it is a good idea to set the fixed cell
* size value. Generally cells are around 24px, so setting a fixed cell size
* of 24 is likely to result in very little difference in visuals, but a
* improvement to performance.
*
* To set this property via CSS, use the -fx-fixed-cell-size property.
* This should not be confused with the -fx-cell-size property. The difference
* between these two CSS properties is that -fx-cell-size will size all
* cells to the specified size, but it will not enforce that this is the
* only size (thus allowing for variable cell sizes, and preventing the
* performance gains from being possible). Therefore, when performance matters
* use -fx-fixed-cell-size, instead of -fx-cell-size. If both properties are
* specified in CSS, -fx-fixed-cell-size takes precedence.
*
* @return the fixed cell size property
* @since JavaFX 8.0
*/
public final DoubleProperty fixedCellSizeProperty() {
if (fixedCellSize == null) {
fixedCellSize = new StyleableDoubleProperty(Region.USE_COMPUTED_SIZE) {
@Override public CssMetaData,Number> getCssMetaData() {
return StyleableProperties.FIXED_CELL_SIZE;
}
@Override public Object getBean() {
return ListView.this;
}
@Override public String getName() {
return "fixedCellSize";
}
};
}
return fixedCellSize;
}
// --- Editable
private BooleanProperty editable;
public final void setEditable(boolean value) {
editableProperty().set(value);
}
public final boolean isEditable() {
return editable == null ? false : editable.get();
}
/**
* Specifies whether this ListView is editable - only if the ListView and
* the ListCells within it are both editable will a ListCell be able to go
* into their editing state.
* @return the editable property
*/
public final BooleanProperty editableProperty() {
if (editable == null) {
editable = new SimpleBooleanProperty(this, "editable", false);
}
return editable;
}
// --- Editing Index
private ReadOnlyIntegerWrapper editingIndex;
private void setEditingIndex(int value) {
editingIndexPropertyImpl().set(value);
}
/**
* Returns the index of the item currently being edited in the ListView,
* or -1 if no item is being edited.
* @return the index of the item currently being edited
*/
public final int getEditingIndex() {
return editingIndex == null ? -1 : editingIndex.get();
}
/**
* A property used to represent the index of the item currently being edited
* in the ListView, if editing is taking place, or -1 if no item is being edited.
*
*
It is not possible to set the editing index, instead it is required that
* you call {@link #edit(int)}.
* @return the editing index property
*/
public final ReadOnlyIntegerProperty editingIndexProperty() {
return editingIndexPropertyImpl().getReadOnlyProperty();
}
private ReadOnlyIntegerWrapper editingIndexPropertyImpl() {
if (editingIndex == null) {
editingIndex = new ReadOnlyIntegerWrapper(this, "editingIndex", -1);
}
return editingIndex;
}
// --- On Edit Start
private ObjectProperty>> onEditStart;
/**
* Sets the {@link EventHandler} that will be called when the user begins
* an edit.
*
* This is a convenience method - the same result can be
* achieved by calling
* addEventHandler(ListView.EDIT_START_EVENT, eventHandler).
* @param value the EventHandler that will be called when the user begins
* an edit
*/
public final void setOnEditStart(EventHandler> value) {
onEditStartProperty().set(value);
}
/**
* Returns the {@link EventHandler} that will be called when the user begins
* an edit.
* @return the EventHandler that will be called when the user begins an edit
*/
public final EventHandler> getOnEditStart() {
return onEditStart == null ? null : onEditStart.get();
}
/**
* This event handler will be fired when the user successfully initiates
* editing.
* @return the onEditStart event handler property
*/
public final ObjectProperty>> onEditStartProperty() {
if (onEditStart == null) {
onEditStart = new ObjectPropertyBase<>() {
@Override protected void invalidated() {
setEventHandler(ListView.editStartEvent(), get());
}
@Override
public Object getBean() {
return ListView.this;
}
@Override
public String getName() {
return "onEditStart";
}
};
}
return onEditStart;
}
// --- On Edit Commit
private ObjectProperty>> onEditCommit;
/**
* Sets the {@link EventHandler} that will be called when the user has
* completed their editing. This is called as part of the
* {@link ListCell#commitEdit(java.lang.Object)} method.
*
* This is a convenience method - the same result can be
* achieved by calling
* addEventHandler(ListView.EDIT_START_EVENT, eventHandler).
* @param value the EventHandler that will be called when the user has
* completed their editing
*/
public final void setOnEditCommit(EventHandler> value) {
onEditCommitProperty().set(value);
}
/**
* Returns the {@link EventHandler} that will be called when the user commits
* an edit.
* @return the EventHandler that will be called when the user commits an edit
*/
public final EventHandler> getOnEditCommit() {
return onEditCommit == null ? null : onEditCommit.get();
}
/**
* This property is used when the user performs an action that should
* result in their editing input being persisted.
*
* The EventHandler in this property should not be called directly -
* instead call {@link ListCell#commitEdit(java.lang.Object)} from within
* your custom ListCell. This will handle firing this event, updating the
* view, and switching out of the editing state.
* @return the onEditCommit event handler property
*/
public final ObjectProperty>> onEditCommitProperty() {
if (onEditCommit == null) {
onEditCommit = new ObjectPropertyBase<>() {
@Override protected void invalidated() {
setEventHandler(ListView.editCommitEvent(), get());
}
@Override
public Object getBean() {
return ListView.this;
}
@Override
public String getName() {
return "onEditCommit";
}
};
}
return onEditCommit;
}
// --- On Edit Cancel
private ObjectProperty>> onEditCancel;
/**
* Sets the {@link EventHandler} that will be called when the user cancels
* an edit.
* @param value the EventHandler that will be called when the user cancels
* an edit
*/
public final void setOnEditCancel(EventHandler> value) {
onEditCancelProperty().set(value);
}
/**
* Returns the {@link EventHandler} that will be called when the user cancels
* an edit.
* @return the EventHandler that will be called when the user cancels an edit
*/
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 onEditCancel event handler property
*/
public final ObjectProperty>> onEditCancelProperty() {
if (onEditCancel == null) {
onEditCancel = new ObjectPropertyBase<>() {
@Override protected void invalidated() {
setEventHandler(ListView.editCancelEvent(), get());
}
@Override
public Object getBean() {
return ListView.this;
}
@Override
public String getName() {
return "onEditCancel";
}
};
}
return onEditCancel;
}
/* *************************************************************************
* *
* Public API *
* *
**************************************************************************/
/**
* Instructs the ListView to begin editing the item in the given index, if
* the ListView is {@link #editableProperty() editable}. Once
* this method is called, if the current {@link #cellFactoryProperty()} is
* set up to support editing, the Cell will switch its visual state to enable
* for user input to take place.
*
* @param itemIndex The index of the item in the ListView that should be
* edited.
*/
public void edit(int itemIndex) {
if (!isEditable()) return;
setEditingIndex(itemIndex);
}
/**
* Scrolls the ListView such that the item in the given index is visible to
* the end user.
*
* @param index The index that should be made visible to the user, assuming
* of course that it is greater than, or equal to 0, and less than the
* size of the items list contained within the given ListView.
*/
public void scrollTo(int index) {
ControlUtils.scrollToIndex(this, index);
}
/**
* Scrolls the ListView so that the given object is visible within the viewport.
* @param object The object that should be visible to the user.
* @since JavaFX 8.0
*/
public void scrollTo(T object) {
if( getItems() != null ) {
int idx = getItems().indexOf(object);
if( idx >= 0 ) {
ControlUtils.scrollToIndex(this, idx);
}
}
}
/**
* Called when there's a request to scroll an index into view using {@link #scrollTo(int)}
* or {@link #scrollTo(Object)}
* @since JavaFX 8.0
*/
private ObjectProperty>> onScrollTo;
public void setOnScrollTo(EventHandler> value) {
onScrollToProperty().set(value);
}
public EventHandler> getOnScrollTo() {
if( onScrollTo != null ) {
return onScrollTo.get();
}
return null;
}
public ObjectProperty>> onScrollToProperty() {
if( onScrollTo == null ) {
onScrollTo = new ObjectPropertyBase<>() {
@Override protected void invalidated() {
setEventHandler(ScrollToEvent.scrollToTopIndex(), get());
}
@Override public Object getBean() {
return ListView.this;
}
@Override public String getName() {
return "onScrollTo";
}
};
}
return onScrollTo;
}
/** {@inheritDoc} */
@Override protected Skin createDefaultSkin() {
return new ListViewSkin<>(this);
}
/**
* Calling {@code refresh()} forces the ListView control to recreate and
* repopulate the cells necessary to populate the visual bounds of the control.
* In other words, this forces the ListView to update what it is showing to
* the user. This is useful in cases where the underlying data source has
* changed in a way that is not observed by the ListView itself.
*
* @since JavaFX 8u60
*/
public void refresh() {
getProperties().put(Properties.RECREATE, Boolean.TRUE);
}
/* *************************************************************************
* *
* Private Implementation *
* *
**************************************************************************/
/* *************************************************************************
* *
* Stylesheet Handling *
* *
**************************************************************************/
private static final String DEFAULT_STYLE_CLASS = "list-view";
private static class StyleableProperties {
private static final CssMetaData,Orientation> ORIENTATION =
new CssMetaData<>("-fx-orientation",
new EnumConverter<>(Orientation.class),
Orientation.VERTICAL) {
@Override
public Orientation getInitialValue(ListView node) {
// A vertical ListView should remain vertical
return node.getOrientation();
}
@Override
public boolean isSettable(ListView n) {
return n.orientation == null || !n.orientation.isBound();
}
@SuppressWarnings("unchecked") // orientationProperty() is a StyleableProperty
@Override
public StyleableProperty getStyleableProperty(ListView n) {
return (StyleableProperty)n.orientationProperty();
}
};
private static final CssMetaData,Number> FIXED_CELL_SIZE =
new CssMetaData<>("-fx-fixed-cell-size",
SizeConverter.getInstance(),
Region.USE_COMPUTED_SIZE) {
@Override public Double getInitialValue(ListView node) {
return node.getFixedCellSize();
}
@Override public boolean isSettable(ListView n) {
return n.fixedCellSize == null || !n.fixedCellSize.isBound();
}
@Override public StyleableProperty getStyleableProperty(ListView n) {
return (StyleableProperty)n.fixedCellSizeProperty();
}
};
private static final List> STYLEABLES;
static {
final List> styleables =
new ArrayList<>(Control.getClassCssMetaData());
styleables.add(ORIENTATION);
styleables.add(FIXED_CELL_SIZE);
STYLEABLES = Collections.unmodifiableList(styleables);
}
}
/**
* 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 StyleableProperties.STYLEABLES;
}
/**
* {@inheritDoc}
* @since JavaFX 8.0
*/
@Override
public List> getControlCssMetaData() {
return getClassCssMetaData();
}
private static final PseudoClass PSEUDO_CLASS_VERTICAL =
PseudoClass.getPseudoClass("vertical");
private static final PseudoClass PSEUDO_CLASS_HORIZONTAL =
PseudoClass.getPseudoClass("horizontal");
/* *************************************************************************
* *
* Accessibility handling *
* *
**************************************************************************/
/** {@inheritDoc} */
@Override
public Object queryAccessibleAttribute(AccessibleAttribute attribute, Object... parameters) {
switch (attribute) {
case MULTIPLE_SELECTION: {
MultipleSelectionModel sm = getSelectionModel();
return sm != null && sm.getSelectionMode() == SelectionMode.MULTIPLE;
}
default: return super.queryAccessibleAttribute(attribute, parameters);
}
}
/* *************************************************************************
* *
* Support Interfaces *
* *
**************************************************************************/
/* *************************************************************************
* *
* Support Classes *
* *
**************************************************************************/
/**
* An {@link Event} subclass used specifically in ListView for representing
* edit-related events. It provides additional API to easily access the
* index that the edit event took place on, as well as the input provided
* by the end user.
*
* @param The type of the input, which is the same type as the ListView
* itself.
* @since JavaFX 2.0
*/
public static class EditEvent extends Event {
private final T newValue;
private final int editIndex;
private final ListView source;
private static final long serialVersionUID = 20130724L;
/**
* Common supertype for all edit event types.
* @since JavaFX 8.0
*/
public static final EventType ANY = EDIT_ANY_EVENT;
/**
* Creates a new EditEvent instance to represent an edit event. This
* event is used for {@link #editStartEvent()},
* {@link #editCommitEvent()} and {@link #editCancelEvent()} types.
* @param source the source
* @param eventType the event type
* @param newValue the new value
* @param editIndex the edit index
*/
public EditEvent(ListView source,
EventType> eventType,
T newValue,
int editIndex) {
super(source, Event.NULL_SOURCE_TARGET, eventType);
this.source = source;
this.editIndex = editIndex;
this.newValue = newValue;
}
/**
* Returns the ListView upon which the edit took place.
*/
@Override public ListView getSource() {
return source;
}
/**
* Returns the index in which the edit took place.
* @return the index in which the edit took place
*/
public int getIndex() {
return editIndex;
}
/**
* Returns the value of the new input provided by the end user.
* @return the value of the new input provided by the end user
*/
public T getNewValue() {
return newValue;
}
/**
* Returns a string representation of this {@code EditEvent} object.
* @return a string representation of this {@code EditEvent} object.
*/
@Override public String toString() {
return "ListViewEditEvent [ newValue: " + getNewValue() + ", ListView: " + getSource() + " ]";
}
}
// package for testing
static class ListViewBitSetSelectionModel extends MultipleSelectionModelBase {
/* *********************************************************************
* *
* Constructors *
* *
**********************************************************************/
public ListViewBitSetSelectionModel(final ListView listView) {
if (listView == null) {
throw new IllegalArgumentException("ListView can not be null");
}
this.listView = listView;
/*
* The following two listeners are used in conjunction with
* SelectionModel.select(T obj) to allow for a developer to select
* an item that is not actually in the data model. When this occurs,
* we actively try to find an index that matches this object, going
* so far as to actually watch for all changes to the items list,
* rechecking each time.
*/
itemsObserver = new InvalidationListener() {
private WeakReference> weakItemsRef = new WeakReference<>(listView.getItems());
@Override public void invalidated(Observable observable) {
ObservableList oldItems = weakItemsRef.get();
weakItemsRef = new WeakReference<>(listView.getItems());
updateItemsObserver(oldItems, listView.getItems());
}
};
this.listView.itemsProperty().addListener(new WeakInvalidationListener(itemsObserver));
if (listView.getItems() != null) {
this.listView.getItems().addListener(weakItemsContentObserver);
}
updateItemCount();
updateDefaultSelection();
}
// watching for changes to the items list content
private final ListChangeListener itemsContentObserver = new ListChangeListener<>() {
@Override public void onChanged(Change c) {
updateItemCount();
boolean doSelectionUpdate = true;
while (c.next()) {
final T selectedItem = getSelectedItem();
final int selectedIndex = getSelectedIndex();
if (listView.getItems() == null || listView.getItems().isEmpty()) {
selectedItemChange = c;
clearSelection();
selectedItemChange = null;
} else if (selectedIndex == -1 && selectedItem != null) {
int newIndex = listView.getItems().indexOf(selectedItem);
if (newIndex != -1) {
setSelectedIndex(newIndex);
doSelectionUpdate = false;
}
} else if (c.wasRemoved() &&
c.getRemovedSize() == 1 &&
! c.wasAdded() &&
selectedItem != null &&
selectedItem.equals(c.getRemoved().get(0))) {
// Bug fix for RT-28637
if (getSelectedIndex() < getItemCount()) {
final int previousRow = selectedIndex == 0 ? 0 : selectedIndex - 1;
T newSelectedItem = getModelItem(previousRow);
if (! selectedItem.equals(newSelectedItem)) {
startAtomic();
clearSelection(selectedIndex);
stopAtomic();
select(newSelectedItem);
}
}
}
}
if (doSelectionUpdate) {
updateSelection(c);
}
}
};
// watching for changes to the items list
private final InvalidationListener itemsObserver;
private WeakListChangeListener weakItemsContentObserver =
new WeakListChangeListener<>(itemsContentObserver);
/* *********************************************************************
* *
* Internal properties *
* *
**********************************************************************/
private final ListView listView;
private int itemCount = 0;
private int previousModelSize = 0;
// Listen to changes in the listview items list, such that when it
// changes we can update the selected indices bitset to refer to the
// new indices.
// At present this is basically a left/right shift operation, which
// seems to work ok.
private void updateSelection(Change c) {
// // debugging output
// System.out.println(listView.getId());
// if (c.wasAdded()) {
// System.out.println("\tAdded size: " + c.getAddedSize() + ", Added sublist: " + c.getAddedSubList());
// }
// if (c.wasRemoved()) {
// System.out.println("\tRemoved size: " + c.getRemovedSize() + ", Removed sublist: " + c.getRemoved());
// }
// if (c.wasReplaced()) {
// System.out.println("\tWas replaced");
// }
// if (c.wasPermutated()) {
// System.out.println("\tWas permutated");
// }
c.reset();
List> shifts = new ArrayList<>();
while (c.next()) {
if (c.wasReplaced()) {
if (c.getList().isEmpty()) {
// the entire items list was emptied - clear selection
clearSelection();
} else {
int index = getSelectedIndex();
if (previousModelSize == c.getRemovedSize()) {
// all items were removed from the model
clearSelection();
} else if (index < getItemCount() && index >= 0) {
// Fix for RT-18969: the list had setAll called on it
// Use of makeAtomic is a fix for RT-20945
startAtomic();
clearSelection(index);
stopAtomic();
select(index);
} else {
// Fix for RT-22079
clearSelection();
}
}
} else if (c.wasAdded() || c.wasRemoved()) {
int shift = c.wasAdded() ? c.getAddedSize() : -c.getRemovedSize();
shifts.add(new Pair<>(c.getFrom(), shift));
} else if (c.wasPermutated()) {
// General approach:
// -- detected a sort has happened
// -- Create a permutation lookup map (1)
// -- dump all the selected indices into a list (2)
// -- clear the selected items / indexes (3)
// -- create a list containing the new indices (4)
// -- for each previously-selected index (5)
// -- if index is in the permutation lookup map
// -- add the new index to the new indices list
// -- Perform batch selection (6)
// (1)
int length = c.getTo() - c.getFrom();
HashMap pMap = new HashMap<>(length);
for (int i = c.getFrom(); i < c.getTo(); i++) {
pMap.put(i, c.getPermutation(i));
}
// (2)
List selectedIndices = new ArrayList<>(getSelectedIndices());
// (3)
clearSelection();
// (4)
List newIndices = new ArrayList<>(getSelectedIndices().size());
// (5)
for (int i = 0; i < selectedIndices.size(); i++) {
int oldIndex = selectedIndices.get(i);
if (pMap.containsKey(oldIndex)) {
Integer newIndex = pMap.get(oldIndex);
newIndices.add(newIndex);
}
}
// (6)
if (!newIndices.isEmpty()) {
if (newIndices.size() == 1) {
select(newIndices.get(0));
} else {
int[] ints = new int[newIndices.size() - 1];
for (int i = 0; i < newIndices.size() - 1; i++) {
ints[i] = newIndices.get(i + 1);
}
selectIndices(newIndices.get(0), ints);
}
}
}
}
if (!shifts.isEmpty()) {
shiftSelection(shifts, null);
}
previousModelSize = getItemCount();
}
/* *********************************************************************
* *
* Public selection API *
* *
**********************************************************************/
/** {@inheritDoc} */
@Override public void selectAll() {
// when a selectAll happens, the anchor should not change, so we store it
// before, and restore it afterwards
final int anchor = ListCellBehavior.getAnchor(listView, -1);
super.selectAll();
ListCellBehavior.setAnchor(listView, anchor, false);
}
/** {@inheritDoc} */
@Override public void clearAndSelect(int row) {
ListCellBehavior.setAnchor(listView, row, false);
super.clearAndSelect(row);
}
/** {@inheritDoc} */
@Override protected void focus(int row) {
if (listView.getFocusModel() == null) return;
listView.getFocusModel().focus(row);
listView.notifyAccessibleAttributeChanged(AccessibleAttribute.FOCUS_ITEM);
}
/** {@inheritDoc} */
@Override protected int getFocusedIndex() {
if (listView.getFocusModel() == null) return -1;
return listView.getFocusModel().getFocusedIndex();
}
@Override protected int getItemCount() {
return itemCount;
}
@Override protected T getModelItem(int index) {
List items = listView.getItems();
if (items == null) return null;
if (index < 0 || index >= itemCount) return null;
return items.get(index);
}
/* *********************************************************************
* *
* Private implementation *
* *
**********************************************************************/
private void updateItemCount() {
if (listView == null) {
itemCount = -1;
} else {
List items = listView.getItems();
itemCount = items == null ? -1 : items.size();
}
}
private void updateItemsObserver(ObservableList oldList, ObservableList newList) {
// update listeners
if (oldList != null) {
oldList.removeListener(weakItemsContentObserver);
}
if (newList != null) {
newList.addListener(weakItemsContentObserver);
}
updateItemCount();
updateDefaultSelection();
}
private void updateDefaultSelection() {
// when the items list totally changes, we should clear out
// the selection and focus
int newSelectionIndex = -1;
int newFocusIndex = -1;
if (listView.getItems() != null) {
T selectedItem = getSelectedItem();
if (selectedItem != null) {
newSelectionIndex = listView.getItems().indexOf(selectedItem);
newFocusIndex = newSelectionIndex;
}
// we put focus onto the first item, if there is at least
// one item in the list
if (listView.selectFirstRowByDefault && newFocusIndex == -1) {
newFocusIndex = listView.getItems().size() > 0 ? 0 : -1;
}
}
clearSelection();
select(newSelectionIndex);
// focus(newFocusIndex);
}
}
// package for testing
static class ListViewFocusModel extends FocusModel {
private final ListView listView;
private int itemCount = 0;
public ListViewFocusModel(final ListView listView) {
if (listView == null) {
throw new IllegalArgumentException("ListView can not be null");
}
this.listView = listView;
itemsObserver = new InvalidationListener() {
private WeakReference> weakItemsRef = new WeakReference<>(listView.getItems());
@Override public void invalidated(Observable observable) {
ObservableList oldItems = weakItemsRef.get();
weakItemsRef = new WeakReference<>(listView.getItems());
updateItemsObserver(oldItems, listView.getItems());
}
};
this.listView.itemsProperty().addListener(new WeakInvalidationListener(itemsObserver));
if (listView.getItems() != null) {
this.listView.getItems().addListener(weakItemsContentListener);
}
updateItemCount();
updateDefaultFocus();
focusedIndexProperty().addListener(o -> {
listView.notifyAccessibleAttributeChanged(AccessibleAttribute.FOCUS_ITEM);
});
}
private void updateItemsObserver(ObservableList oldList, ObservableList newList) {
// the listview items list has changed, we need to observe
// the new list, and remove any observer we had from the old list
if (oldList != null) oldList.removeListener(weakItemsContentListener);
if (newList != null) newList.addListener(weakItemsContentListener);
updateItemCount();
updateDefaultFocus();
}
private final InvalidationListener itemsObserver;
// Listen to changes in the listview items list, such that when it
// changes we can update the focused index to refer to the new indices.
private final ListChangeListener itemsContentListener = c -> {
updateItemCount();
while (c.next()) {
// looking at the first change
int from = c.getFrom();
if (c.wasReplaced() || c.getAddedSize() == getItemCount()) {
updateDefaultFocus();
return;
}
if (getFocusedIndex() == -1 || from > getFocusedIndex()) {
return;
}
c.reset();
boolean added = false;
boolean removed = false;
int addedSize = 0;
int removedSize = 0;
while (c.next()) {
added |= c.wasAdded();
removed |= c.wasRemoved();
addedSize += c.getAddedSize();
removedSize += c.getRemovedSize();
}
if (added && !removed) {
focus(Math.min(getItemCount() - 1, getFocusedIndex() + addedSize));
} else if (!added && removed) {
focus(Math.max(0, getFocusedIndex() - removedSize));
}
}
};
private WeakListChangeListener weakItemsContentListener
= new WeakListChangeListener<>(itemsContentListener);
@Override protected int getItemCount() {
return itemCount;
}
@Override protected T getModelItem(int index) {
if (isEmpty()) return null;
if (index < 0 || index >= itemCount) return null;
return listView.getItems().get(index);
}
private boolean isEmpty() {
return itemCount == -1;
}
private void updateItemCount() {
if (listView == null) {
itemCount = -1;
} else {
List items = listView.getItems();
itemCount = items == null ? -1 : items.size();
}
}
private void updateDefaultFocus() {
// when the items list totally changes, we should clear out
// the focus
int newValueIndex = -1;
if (listView.getItems() != null) {
T focusedItem = getFocusedItem();
if (focusedItem != null) {
newValueIndex = listView.getItems().indexOf(focusedItem);
}
// we put focus onto the first item, if there is at least
// one item in the list
if (newValueIndex == -1) {
newValueIndex = listView.getItems().size() > 0 ? 0 : -1;
}
}
focus(newValueIndex);
}
}
}