javafx.scene.control.TreeTableCell Maven / Gradle / Ivy
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*
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package javafx.scene.control;
import javafx.css.PseudoClass;
import javafx.scene.control.skin.TreeTableCellSkin;
import javafx.beans.InvalidationListener;
import javafx.beans.WeakInvalidationListener;
import javafx.beans.value.ObservableValue;
import javafx.collections.ListChangeListener;
import javafx.event.Event;
import javafx.collections.WeakListChangeListener;
import java.lang.ref.WeakReference;
import javafx.beans.property.ReadOnlyObjectProperty;
import javafx.beans.property.ReadOnlyObjectWrapper;
import javafx.scene.AccessibleAction;
import javafx.scene.AccessibleAttribute;
import javafx.scene.AccessibleRole;
import javafx.scene.control.TreeTableColumn.CellEditEvent;
import javafx.scene.control.TreeTableView.TreeTableViewFocusModel;
/**
* Represents a single row/column intersection in a {@link TreeTableView}. To
* represent this intersection, a TreeTableCell contains an
* {@link #indexProperty() index} property, as well as a
* {@link #tableColumnProperty() tableColumn} property. In addition, a TreeTableCell
* instance knows what {@link TreeTableRow} it exists in.
*
* A note about selection: A TreeTableCell visually shows it is
* selected when two conditions are met:
*
* - The {@link TableSelectionModel#isSelected(int, TableColumnBase)} method
* returns true for the row / column that this cell represents, and
* - The {@link javafx.scene.control.TableSelectionModel#cellSelectionEnabledProperty() cell selection mode}
* property is set to true (to represent that it is allowable to select
* individual cells (and not just rows of cells)).
*
*
* @param The type of the TreeTableView generic type
* @see TreeTableView
* @see TreeTableColumn
* @see Cell
* @see IndexedCell
* @see TreeTableRow
* @param The type of the item contained within the Cell.
* @since JavaFX 8.0
*/
public class TreeTableCell extends IndexedCell {
/* *************************************************************************
* *
* Constructors *
* *
**************************************************************************/
/**
* Constructs a default TreeTableCell instance with a style class of
* 'tree-table-cell'.
*/
public TreeTableCell() {
getStyleClass().addAll(DEFAULT_STYLE_CLASS);
setAccessibleRole(AccessibleRole.TREE_TABLE_CELL);
updateColumnIndex();
}
/* *************************************************************************
* *
* Private fields *
* *
**************************************************************************/
// package for testing
boolean lockItemOnEdit = false;
/* *************************************************************************
* *
* Callbacks and Events *
* *
**************************************************************************/
private boolean itemDirty = false;
/*
* This is the list observer we use to keep an eye on the SelectedCells
* ObservableList in the tree table view. Because it is possible that the table can
* be mutated, we create this observer here, and add/remove it from the
* storeTableView method.
*/
private ListChangeListener> selectedListener = c -> {
while (c.next()) {
if (c.wasAdded() || c.wasRemoved()) {
updateSelection();
}
}
};
// same as above, but for focus
private final InvalidationListener focusedListener = value -> {
updateFocus();
};
// same as above, but for for changes to the properties on TableRow
private final InvalidationListener tableRowUpdateObserver = value -> {
itemDirty = true;
requestLayout();
};
private final InvalidationListener editingListener = value -> {
updateEditing();
};
private ListChangeListener> visibleLeafColumnsListener = c -> {
updateColumnIndex();
};
private ListChangeListener columnStyleClassListener = c -> {
while (c.next()) {
if (c.wasRemoved()) {
getStyleClass().removeAll(c.getRemoved());
}
if (c.wasAdded()) {
getStyleClass().addAll(c.getAddedSubList());
}
}
};
private final InvalidationListener rootPropertyListener = observable -> {
updateItem(-1);
};
private final InvalidationListener columnStyleListener = value -> {
if (getTableColumn() != null) {
possiblySetStyle(getTableColumn().getStyle());
}
};
private final InvalidationListener columnIdListener = value -> {
if (getTableColumn() != null) {
possiblySetId(getTableColumn().getId());
}
};
private final WeakListChangeListener> weakSelectedListener =
new WeakListChangeListener>(selectedListener);
private final WeakInvalidationListener weakFocusedListener =
new WeakInvalidationListener(focusedListener);
private final WeakInvalidationListener weaktableRowUpdateObserver =
new WeakInvalidationListener(tableRowUpdateObserver);
private final WeakInvalidationListener weakEditingListener =
new WeakInvalidationListener(editingListener);
private final WeakListChangeListener> weakVisibleLeafColumnsListener =
new WeakListChangeListener>(visibleLeafColumnsListener);
private final WeakListChangeListener weakColumnStyleClassListener =
new WeakListChangeListener(columnStyleClassListener);
private final WeakInvalidationListener weakColumnStyleListener =
new WeakInvalidationListener(columnStyleListener);
private final WeakInvalidationListener weakColumnIdListener =
new WeakInvalidationListener(columnIdListener);
private final WeakInvalidationListener weakRootPropertyListener =
new WeakInvalidationListener(rootPropertyListener);
/* *************************************************************************
* *
* Properties *
* *
**************************************************************************/
// --- TableColumn
/**
* The {@code TreeTableColumn} instance that backs this {@code TreeTableCell}.
*/
private ReadOnlyObjectWrapper> tableColumn =
new ReadOnlyObjectWrapper>(this, "tableColumn") {
@Override protected void invalidated() {
updateColumnIndex();
}
};
public final ReadOnlyObjectProperty> tableColumnProperty() { return tableColumn.getReadOnlyProperty(); }
private void setTableColumn(TreeTableColumn value) { tableColumn.set(value); }
public final TreeTableColumn getTableColumn() { return tableColumn.get(); }
// --- TableView
/**
* The {@code TreeTableView} associated with this {@code TreeTableCell}.
*/
private ReadOnlyObjectWrapper> treeTableView;
private void setTreeTableView(TreeTableView value) {
treeTableViewPropertyImpl().set(value);
}
public final TreeTableView getTreeTableView() {
return treeTableView == null ? null : treeTableView.get();
}
public final ReadOnlyObjectProperty> treeTableViewProperty() {
return treeTableViewPropertyImpl().getReadOnlyProperty();
}
private ReadOnlyObjectWrapper> treeTableViewPropertyImpl() {
if (treeTableView == null) {
treeTableView = new ReadOnlyObjectWrapper>(this, "treeTableView") {
private WeakReference> weakTableViewRef;
@Override protected void invalidated() {
TreeTableView.TreeTableViewSelectionModel sm;
TreeTableView.TreeTableViewFocusModel fm;
if (weakTableViewRef != null) {
TreeTableView oldTableView = weakTableViewRef.get();
if (oldTableView != null) {
sm = oldTableView.getSelectionModel();
if (sm != null) {
sm.getSelectedCells().removeListener(weakSelectedListener);
}
fm = oldTableView.getFocusModel();
if (fm != null) {
fm.focusedCellProperty().removeListener(weakFocusedListener);
}
oldTableView.editingCellProperty().removeListener(weakEditingListener);
oldTableView.getVisibleLeafColumns().removeListener(weakVisibleLeafColumnsListener);
oldTableView.rootProperty().removeListener(weakRootPropertyListener);
}
}
TreeTableView newTreeTableView = get();
if (newTreeTableView != null) {
sm = newTreeTableView.getSelectionModel();
if (sm != null) {
sm.getSelectedCells().addListener(weakSelectedListener);
}
fm = newTreeTableView.getFocusModel();
if (fm != null) {
fm.focusedCellProperty().addListener(weakFocusedListener);
}
newTreeTableView.editingCellProperty().addListener(weakEditingListener);
newTreeTableView.getVisibleLeafColumns().addListener(weakVisibleLeafColumnsListener);
newTreeTableView.rootProperty().addListener(weakRootPropertyListener);
weakTableViewRef = new WeakReference>(newTreeTableView);
}
updateColumnIndex();
}
};
}
return treeTableView;
}
// --- TableRow
/**
* The {@code TreeTableRow} that this {@code TreeTableCell} currently finds itself placed within.
*/
private ReadOnlyObjectWrapper> tableRow =
new ReadOnlyObjectWrapper>(this, "tableRow");
private void setTableRow(TreeTableRow value) { tableRow.set(value); }
/**
* Gets the value of the property {@code tableRow}.
* @return the value of the property {@code tableRow}
* @since 17
*/
public final TreeTableRow getTableRow() { return tableRow.get(); }
public final ReadOnlyObjectProperty> tableRowProperty() {
return tableRow.getReadOnlyProperty();
}
// The following method was misnamed and is deprecated in favor of the
// correctly named method.
/**
* @deprecated Use {@link getTableRow} instead.
* @return the {@code TreeTableRow}
*/
@Deprecated(since = "17")
public final TreeTableRow getTreeTableRow() { return getTableRow(); }
/* *************************************************************************
* *
* Editing API *
* *
**************************************************************************/
// editing location at start of edit - fix for JDK-8187229
private TreeTablePosition editingCellAtStartEdit = null;
/** {@inheritDoc} */
@Override public void startEdit() {
if (isEditing()) return;
final TreeTableView table = getTreeTableView();
final TreeTableColumn column = getTableColumn();
final TreeTableRow row = getTableRow();
if (!isEditable() ||
(table != null && !table.isEditable()) ||
(column != null && !column.isEditable()) ||
(row != null && !row.isEditable())) {
return;
}
// We check the boolean lockItemOnEdit field here, as whilst we want to
// updateItem normally, when it comes to unit tests we can't have the
// item change in all circumstances.
if (! lockItemOnEdit) {
updateItem(-1);
}
// it makes sense to get the cell into its editing state before firing
// the event to listeners below, so that's what we're doing here
// by calling super.startEdit().
super.startEdit();
if (column != null) {
CellEditEvent editEvent = new CellEditEvent(
table,
table.getEditingCell(),
TreeTableColumn.editStartEvent(),
null
);
Event.fireEvent(column, editEvent);
}
editingCellAtStartEdit = new TreeTablePosition<>(table, getIndex(), column);
}
/** {@inheritDoc} */
@Override public void commitEdit(T newValue) {
if (! isEditing()) return;
final TreeTableView table = getTreeTableView();
if (table != null) {
@SuppressWarnings("unchecked")
TreeTablePosition editingCell = (TreeTablePosition) table.getEditingCell();
// Inform the TableView of the edit being ready to be committed.
CellEditEvent editEvent = new CellEditEvent(
table,
editingCell,
TreeTableColumn.editCommitEvent(),
newValue
);
Event.fireEvent(getTableColumn(), editEvent);
}
// inform parent classes of the commit, so that they can switch us
// out of the editing state.
// This MUST come before the updateItem call below, otherwise it will
// call cancelEdit(), resulting in both commit and cancel events being
// fired (as identified in RT-29650)
super.commitEdit(newValue);
// update the item within this cell, so that it represents the new value
updateItem(newValue, false);
if (table != null) {
// reset the editing cell on the TableView
table.edit(-1, null);
// request focus back onto the table, only if the current focus
// owner has the table as a parent (otherwise the user might have
// clicked out of the table entirely and given focus to something else.
// It would be rude of us to request it back again.
ControlUtils.requestFocusOnControlOnlyIfCurrentFocusOwnerIsChild(table);
}
}
/** {@inheritDoc} */
@Override public void cancelEdit() {
if (! isEditing()) return;
final TreeTableView table = getTreeTableView();
super.cancelEdit();
// reset the editing index on the TableView
if (table != null) {
if (updateEditingIndex) table.edit(-1, null);
// request focus back onto the table, only if the current focus
// owner has the table as a parent (otherwise the user might have
// clicked out of the table entirely and given focus to something else.
// It would be rude of us to request it back again.
ControlUtils.requestFocusOnControlOnlyIfCurrentFocusOwnerIsChild(table);
CellEditEvent editEvent = new CellEditEvent(
table,
editingCellAtStartEdit,
TreeTableColumn.editCancelEvent(),
null
);
Event.fireEvent(getTableColumn(), editEvent);
}
}
/* *************************************************************************
* *
* Overriding methods *
* *
**************************************************************************/
/** {@inheritDoc} */
@Override public void updateSelected(boolean selected) {
// copied from Cell, with the first conditional clause below commented
// out, as it is valid for an empty TableCell to be selected, as long
// as the parent TableRow is not empty (see RT-15529).
/*if (selected && isEmpty()) return;*/
if (getTableRow() == null || getTableRow().isEmpty()) return;
setSelected(selected);
}
/* *************************************************************************
* *
* Private Implementation *
* *
**************************************************************************/
/** {@inheritDoc} */
@Override void indexChanged(int oldIndex, int newIndex) {
super.indexChanged(oldIndex, newIndex);
if (isEditing() && newIndex == oldIndex) {
// no-op
// Fix for RT-31165 - if we (needlessly) update the index whilst the
// cell is being edited it will no longer be in an editing state.
// This means that in certain (common) circumstances that it will
// appear that a cell is uneditable as, despite being clicked, it
// will not change to the editing state as a layout of VirtualFlow
// is immediately invoked, which forces all cells to be updated.
} else {
// Ideally we would just use the following two lines of code, rather
// than the updateItem() call beneath, but if we do this we end up with
// RT-22428 where all the columns are collapsed.
// itemDirty = true;
// requestLayout();
updateItem(oldIndex);
updateSelection();
updateFocus();
updateEditing();
}
}
private boolean isLastVisibleColumn = false;
private int columnIndex = -1;
private void updateColumnIndex() {
final TreeTableView tv = getTreeTableView();
TreeTableColumn tc = getTableColumn();
columnIndex = tv == null || tc == null ? -1 : tv.getVisibleLeafIndex(tc);
// update the pseudo class state regarding whether this is the last
// visible cell (i.e. the right-most).
isLastVisibleColumn = getTableColumn() != null &&
columnIndex != -1 &&
columnIndex == tv.getVisibleLeafColumns().size() - 1;
pseudoClassStateChanged(PSEUDO_CLASS_LAST_VISIBLE, isLastVisibleColumn);
}
private void updateSelection() {
/*
* This cell should be selected if the selection mode of the table
* is cell-based, and if the row and column that this cell represents
* is selected.
*
* If the selection mode is not cell-based, then the listener in the
* TableRow class might pick up the need to set an entire row to be
* selected.
*/
if (isEmpty()) return;
final boolean isSelected = isSelected();
if (! isInCellSelectionMode()) {
if (isSelected) {
updateSelected(false);
}
return;
}
final TreeTableView tv = getTreeTableView();
if (getIndex() == -1 || tv == null) return;
TreeTableView.TreeTableViewSelectionModel sm = tv.getSelectionModel();
if (sm == null) {
updateSelected(false);
return;
}
boolean isSelectedNow = sm.isSelected(getIndex(), getTableColumn());
if (isSelected == isSelectedNow) return;
updateSelected(isSelectedNow);
}
private void updateFocus() {
final boolean isFocused = isFocused();
if (! isInCellSelectionMode()) {
if (isFocused) {
setFocused(false);
}
return;
}
final TreeTableView tv = getTreeTableView();
if (getIndex() == -1 || tv == null) return;
TreeTableView.TreeTableViewFocusModel fm = tv.getFocusModel();
if (fm == null) {
setFocused(false);
return;
}
setFocused(fm.isFocused(getIndex(), getTableColumn()));
}
private void updateEditing() {
final TreeTableView tv = getTreeTableView();
if (getIndex() == -1 || tv == null) {
// JDK-8265206: must cancel edit if index changed to -1 by re-use
if (isEditing()) {
doCancelEdit();
}
return;
}
TreeTablePosition editCell = tv.getEditingCell();
boolean match = match(editCell);
if (match && ! isEditing()) {
startEdit();
} else if (! match && isEditing()) {
doCancelEdit();
}
}
/**
* Switches an editing cell into not editing without changing control's
* editing state.
*/
private void doCancelEdit() {
// If my index is not the one being edited then I need to cancel
// the edit. The tricky thing here is that as part of this call
// I cannot end up calling list.edit(-1) the way that the standard
// cancelEdit method would do. Yet, I need to call cancelEdit
// so that subclasses which override cancelEdit can execute. So,
// I have to use a kind of hacky flag workaround.
try {
// try-finally to make certain that the flag is reliably reset to true
updateEditingIndex = false;
cancelEdit();
} finally {
updateEditingIndex = true;
}
}
private boolean updateEditingIndex = true;
private boolean match(TreeTablePosition pos) {
return pos != null && pos.getRow() == getIndex() && pos.getTableColumn() == getTableColumn();
}
private boolean isInCellSelectionMode() {
TreeTableView tv = getTreeTableView();
if (tv == null) return false;
TreeTableView.TreeTableViewSelectionModel sm = tv.getSelectionModel();
return sm != null && sm.isCellSelectionEnabled();
}
/*
* This was brought in to fix the issue in RT-22077, namely that the
* ObservableValue was being GC'd, meaning that changes to the value were
* no longer being delivered. By extracting this value out of the method,
* it is now referred to from TableCell and will therefore no longer be
* GC'd.
*/
private ObservableValue currentObservableValue = null;
private boolean isFirstRun = true;
private WeakReference oldRowItemRef;
/*
* This is called when we think that the data within this TreeTableCell may have
* changed. You'll note that this is a private function - it is only called
* when one of the triggers above call it.
*/
private void updateItem(int oldIndex) {
if (currentObservableValue != null) {
currentObservableValue.removeListener(weaktableRowUpdateObserver);
}
// get the total number of items in the data model
final TreeTableView tableView = getTreeTableView();
final TreeTableColumn tableColumn = getTableColumn();
final int itemCount = tableView == null ? -1 : getTreeTableView().getExpandedItemCount();
final int index = getIndex();
final boolean isEmpty = isEmpty();
final T oldValue = getItem();
final TreeTableRow tableRow = getTableRow();
final S rowItem = tableRow == null ? null : tableRow.getItem();
final boolean indexExceedsItemCount = index >= itemCount;
// there is a whole heap of reasons why we should just punt...
outer: if (indexExceedsItemCount ||
index < 0 ||
columnIndex < 0 ||
!isVisible() ||
tableColumn == null ||
!tableColumn.isVisible() ||
tableView.getRoot() == null) {
// RT-30484 We need to allow a first run to be special-cased to allow
// for the updateItem method to be called at least once to allow for
// the correct visual state to be set up. In particular, in RT-30484
// refer to Ensemble8PopUpTree.png - in this case the arrows are being
// shown as the new cells are instantiated with the arrows in the
// children list, and are only hidden in updateItem.
// RT-32621: There are circumstances where we need to updateItem,
// even when the index is greater than the itemCount. For example,
// RT-32621 identifies issues where a TreeTableView collapses a
// TreeItem but the custom cells remain visible. This is now
// resolved with the check for indexExceedsItemCount.
if ((!isEmpty && oldValue != null) || isFirstRun || indexExceedsItemCount) {
updateItem(null, true);
isFirstRun = false;
}
return;
} else {
currentObservableValue = tableColumn.getCellObservableValue(index);
final T newValue = currentObservableValue == null ? null : currentObservableValue.getValue();
// RT-35864 - if the index didn't change, then avoid calling updateItem
// unless the item has changed.
if (oldIndex == index) {
if (!isItemChanged(oldValue, newValue)) {
// RT-36670: we need to check the row item here to prevent
// the issue where the cell value and index doesn't change,
// but the backing row object does.
S oldRowItem = oldRowItemRef != null ? oldRowItemRef.get() : null;
if (oldRowItem != null && oldRowItem.equals(rowItem)) {
// RT-37054: we break out of the if/else code here and
// proceed with the code following this, so that we may
// still update references, listeners, etc as required.
break outer;
}
}
}
updateItem(newValue, false);
}
oldRowItemRef = new WeakReference<>(rowItem);
if (currentObservableValue == null) {
return;
}
// add property change listeners to this item
currentObservableValue.addListener(weaktableRowUpdateObserver);
}
@Override protected void layoutChildren() {
if (itemDirty) {
updateItem(-1);
itemDirty = false;
}
super.layoutChildren();
}
/* *************************************************************************
* *
* Expert API *
* *
**************************************************************************/
/**
* Updates the {@code TreeTableView} associated with this {@code TreeTableCell}.
* This is typically only done once when the {@code TreeTableCell} is first
* added to the {@code TreeTableView}.
*
* Note: This function is intended to be used by experts, primarily
* by those implementing new Skins. It is not common
* for developers or designers to access this function directly.
* @param tv the {@code TreeTableView} associated with this {@code TreeTableCell}
*/
public final void updateTreeTableView(TreeTableView tv) {
setTreeTableView(tv);
}
/**
* Updates the {@code TreeTableRow} associated with this {@code TreeTableCell}.
*
* Note: This function is intended to be used by experts, primarily
* by those implementing new Skins. It is not common
* for developers or designers to access this function directly.
* @param row the {@code TreeTableRow} associated with this {@code TreeTableCell}
* @since 17
*/
public final void updateTableRow(TreeTableRow row) {
this.setTableRow(row);
}
/**
* Updates the {@code TreeTableColumn} associated with this {@code TreeTableCell}.
*
* Note: This function is intended to be used by experts, primarily
* by those implementing new Skins. It is not common
* for developers or designers to access this function directly.
* @param column the {@code TreeTableColumn} associated with this {@code TreeTableCell}
* @since 17
*/
public final void updateTableColumn(TreeTableColumn column) {
// remove style class of existing tree table column, if it is non-null
TreeTableColumn oldCol = getTableColumn();
if (oldCol != null) {
oldCol.getStyleClass().removeListener(weakColumnStyleClassListener);
getStyleClass().removeAll(oldCol.getStyleClass());
oldCol.idProperty().removeListener(weakColumnIdListener);
oldCol.styleProperty().removeListener(weakColumnStyleListener);
String id = getId();
String style = getStyle();
if (id != null && id.equals(oldCol.getId())) {
setId(null);
}
if (style != null && style.equals(oldCol.getStyle())) {
setStyle("");
}
}
setTableColumn(column);
if (column != null) {
getStyleClass().addAll(column.getStyleClass());
column.getStyleClass().addListener(weakColumnStyleClassListener);
column.idProperty().addListener(weakColumnIdListener);
column.styleProperty().addListener(weakColumnStyleListener);
possiblySetId(column.getId());
possiblySetStyle(column.getStyle());
}
}
// The following methods were misnamed and are deprecated in favor of the
// correctly named methods.
/**
* @deprecated Use {@link updateTableRow} instead.
* @param row the {@code TreeTableRow}
*/
@Deprecated(since = "17")
public final void updateTreeTableRow(TreeTableRow row) {
updateTableRow(row);
}
/**
* @deprecated Use {@link updateTableColumn} instead.
* @param column the {@code TreeTableColumn}
*/
@Deprecated(since = "17")
public final void updateTreeTableColumn(TreeTableColumn column) {
updateTableColumn(column);
}
/* *************************************************************************
* *
* Stylesheet Handling *
* *
**************************************************************************/
private static final String DEFAULT_STYLE_CLASS = "tree-table-cell";
private static final PseudoClass PSEUDO_CLASS_LAST_VISIBLE =
PseudoClass.getPseudoClass("last-visible");
/** {@inheritDoc} */
@Override protected Skin createDefaultSkin() {
return new TreeTableCellSkin(this);
}
private void possiblySetId(String idCandidate) {
if (getId() == null || getId().isEmpty()) {
setId(idCandidate);
}
}
private void possiblySetStyle(String styleCandidate) {
if (getStyle() == null || getStyle().isEmpty()) {
setStyle(styleCandidate);
}
}
/* *************************************************************************
* *
* Accessibility handling *
* *
**************************************************************************/
/** {@inheritDoc} */
@Override
public Object queryAccessibleAttribute(AccessibleAttribute attribute, Object... parameters) {
switch (attribute) {
case ROW_INDEX:
return getIndex();
case COLUMN_INDEX:
return columnIndex;
case SELECTED:
if (isInCellSelectionMode()) {
return isSelected();
} else {
if (getTableRow() == null) {
return null;
} else {
return getTableRow().isSelected();
}
}
default:
return super.queryAccessibleAttribute(attribute, parameters);
}
}
/** {@inheritDoc} */
@Override
public void executeAccessibleAction(AccessibleAction action, Object... parameters) {
switch (action) {
case REQUEST_FOCUS: {
TreeTableView treeTableView = getTreeTableView();
if (treeTableView != null) {
TreeTableViewFocusModel fm = treeTableView.getFocusModel();
if (fm != null) {
fm.focus(getIndex(), getTableColumn());
}
}
break;
}
default: super.executeAccessibleAction(action, parameters);
}
}
}