javafx.scene.control.skin.TableRowSkinBase Maven / Gradle / Ivy
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package javafx.scene.control.skin;
import java.lang.ref.Reference;
import java.lang.ref.WeakReference;
import java.util.*;
import com.sun.javafx.PlatformUtil;
import javafx.animation.FadeTransition;
import javafx.beans.property.DoubleProperty;
import javafx.beans.property.ObjectProperty;
import javafx.collections.ListChangeListener;
import javafx.collections.ObservableList;
import javafx.collections.WeakListChangeListener;
import javafx.css.StyleOrigin;
import javafx.css.StyleableObjectProperty;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Node;
import javafx.scene.Parent;
import javafx.scene.control.*;
import javafx.util.Duration;
import com.sun.javafx.tk.Toolkit;
/**
* TableRowSkinBase is the base skin class used by controls such as
* {@link javafx.scene.control.TableRow} and {@link javafx.scene.control.TreeTableRow}
* (the concrete classes are {@link TableRowSkin} and {@link TreeTableRowSkin},
* respectively).
*
* @param The type of the cell (i.e. the generic type of the {@link IndexedCell} subclass).
* @param The cell type (e.g. TableRow or TreeTableRow)
* @param The type of cell that is contained within each row (e.g.
* {@link javafx.scene.control.TableCell} or {@link javafx.scene.control.TreeTableCell}).
*
* @since 9
* @see javafx.scene.control.TableRow
* @see javafx.scene.control.TreeTableRow
* @see TableRowSkin
* @see TreeTableRowSkin
*/
public abstract class TableRowSkinBase*/,
R extends IndexedCell> extends CellSkinBase {
/* *************************************************************************
* *
* Static Fields *
* *
**************************************************************************/
// There appears to be a memory leak when using the stub toolkit. Therefore,
// to prevent tests from failing we disable the animations below when the
// stub toolkit is being used.
// Filed as RT-29163.
private static boolean IS_STUB_TOOLKIT = Toolkit.getToolkit().toString().contains("StubToolkit");
// lets save the CPU and not do animations when on embedded platforms
private static boolean DO_ANIMATIONS = ! IS_STUB_TOOLKIT && ! PlatformUtil.isEmbedded();
private static final Duration FADE_DURATION = Duration.millis(200);
/*
* This is rather hacky - but it is a quick workaround to resolve the
* issue that we don't know maximum width of a disclosure node for a given
* control. If we don't know the maximum width, we have no way to ensure
* consistent indentation.
*
* To work around this, we create a single WeakHashMap to store a max
* disclosureNode width per TableColumnBase. We use WeakHashMap to help prevent
* any memory leaks.
*/
static final Map, Double> maxDisclosureWidthMap = new WeakHashMap<>();
// Specifies the number of times we will call 'recreateCells()' before we blow
// out the cellsMap structure and rebuild all cells. This helps to prevent
// against memory leaks in certain extreme circumstances.
private static final int DEFAULT_FULL_REFRESH_COUNTER = 100;
/* *************************************************************************
* *
* Private Fields *
* *
**************************************************************************/
/*
* A map that maps from TableColumn to TableCell (i.e. model to view).
* This is recreated whenever the leaf columns change, however to increase
* efficiency we create cells for all columns, even if they aren't visible,
* and we only create new cells if we don't already have it cached in this
* map.
*
* Note that this means that it is possible for this map to therefore be
* a memory leak if an application uses TableView and is creating and removing
* a large number of tableColumns. This is mitigated in the recreateCells()
* function below - refer to that to learn more.
*/
WeakHashMap> cellsMap;
// This observableArrayList contains the currently visible table cells for this row.
final List cells = new ArrayList<>();
private int fullRefreshCounter = DEFAULT_FULL_REFRESH_COUNTER;
boolean isDirty = false;
boolean updateCells = false;
double fixedCellSize;
boolean fixedCellSizeEnabled;
/* *************************************************************************
* *
* Constructors *
* *
**************************************************************************/
/**
* Creates a new instance of TableRowSkinBase, although note that this
* instance does not handle any behavior / input mappings - this needs to be
* handled appropriately by subclasses.
*
* @param control The control that this skin should be installed onto.
*/
public TableRowSkinBase(C control) {
super(control);
getSkinnable().setPickOnBounds(false);
recreateCells();
updateCells(true);
// init bindings
// watches for any change in the leaf columns observableArrayList - this will indicate
// that the column order has changed and that we should update the row
// such that the cells are in the new order
getVisibleLeafColumns().addListener(weakVisibleLeafColumnsListener);
// --- end init bindings
// use invalidation listener here to update even when item equality is true
// (e.g. see RT-22463)
control.itemProperty().addListener(o -> requestCellUpdate());
registerChangeListener(control.indexProperty(), e -> {
// Fix for RT-36661, where empty table cells were showing content, as they
// had incorrect table cell indices (but the table row index was correct).
// Note that we only do the update on empty cells to avoid the issue
// noted below in requestCellUpdate().
if (getSkinnable().isEmpty()) {
requestCellUpdate();
}
});
}
/* *************************************************************************
* *
* Listeners *
* *
**************************************************************************/
private ListChangeListener visibleLeafColumnsListener = c -> {
isDirty = true;
getSkinnable().requestLayout();
};
private WeakListChangeListener weakVisibleLeafColumnsListener =
new WeakListChangeListener<>(visibleLeafColumnsListener);
/* *************************************************************************
* *
* Abstract Methods *
* *
**************************************************************************/
/**
* Creates a new cell instance that is suitable for representing the given table column instance.
* @param tc the table column
* @return the created cell
*/
protected abstract R createCell(TableColumnBase tc);
/**
* A method to allow the given cell to be told that it is a member of the given row.
* How this is implemented is dependent on the actual cell implementation.
* @param cell The cell for which we want to inform it of its owner row.
* @param row The row which will be set on the given cell.
*/
protected abstract void updateCell(R cell, C row);
/**
* Returns the {@link TableColumnBase} instance for the given cell instance.
* @param cell The cell for which a TableColumn is desired.
* @return the table column
*/
protected abstract TableColumnBase getTableColumn(R cell);
/**
* Returns an unmodifiable list containing the currently visible leaf columns.
* @return the list of visible leaf columns
*/
protected abstract ObservableList*/> getVisibleLeafColumns();
/* *************************************************************************
* *
* Public Methods *
* *
**************************************************************************/
/**
* Returns the graphic to draw on the inside of the disclosure node. Null
* is acceptable when no graphic should be shown. Commonly this is the
* graphic associated with a TreeItem (i.e. treeItem.getGraphic()), rather
* than a graphic associated with a cell.
* @return the graphic to draw on the inside of the disclosure node
*/
protected ObjectProperty graphicProperty() {
return null;
}
/** {@inheritDoc} */
@Override protected void layoutChildren(double x, final double y, final double w, final double h) {
checkState();
if (cellsMap.isEmpty()) return;
ObservableList visibleLeafColumns = getVisibleLeafColumns();
if (visibleLeafColumns.isEmpty()) {
super.layoutChildren(x,y,w,h);
return;
}
C control = getSkinnable();
///////////////////////////////////////////
// indentation code starts here
///////////////////////////////////////////
double leftMargin = 0;
double disclosureWidth = 0;
double graphicWidth = 0;
boolean indentationRequired = isIndentationRequired();
boolean disclosureVisible = isDisclosureNodeVisible();
int indentationColumnIndex = 0;
Node disclosureNode = null;
if (indentationRequired) {
// Determine the column in which we want to put the disclosure node.
// By default it is null, which means the 0th column should be
// where the indentation occurs.
TableColumnBase treeColumn = getTreeColumn();
indentationColumnIndex = treeColumn == null ? 0 : visibleLeafColumns.indexOf(treeColumn);
indentationColumnIndex = indentationColumnIndex < 0 ? 0 : indentationColumnIndex;
int indentationLevel = getIndentationLevel(control);
if (! isShowRoot()) indentationLevel--;
final double indentationPerLevel = getIndentationPerLevel();
leftMargin = indentationLevel * indentationPerLevel;
// position the disclosure node so that it is at the proper indent
final double defaultDisclosureWidth = maxDisclosureWidthMap.containsKey(treeColumn) ?
maxDisclosureWidthMap.get(treeColumn) : 0;
disclosureWidth = defaultDisclosureWidth;
disclosureNode = getDisclosureNode();
if (disclosureNode != null) {
disclosureNode.setVisible(disclosureVisible);
if (disclosureVisible) {
disclosureWidth = disclosureNode.prefWidth(h);
if (disclosureWidth > defaultDisclosureWidth) {
maxDisclosureWidthMap.put(treeColumn, disclosureWidth);
// RT-36359: The recorded max width of the disclosure node
// has increased. We need to go back and request all
// earlier rows to update themselves to take into account
// this increased indentation.
final VirtualFlow flow = getVirtualFlow();
final int thisIndex = getSkinnable().getIndex();
for (int i = 0; i < flow.cells.size(); i++) {
C cell = flow.cells.get(i);
if (cell == null || cell.isEmpty()) continue;
cell.requestLayout();
cell.layout();
}
}
}
}
}
///////////////////////////////////////////
// indentation code ends here
///////////////////////////////////////////
// layout the individual column cells
double width;
double height;
final double verticalPadding = snappedTopInset() + snappedBottomInset();
final double horizontalPadding = snappedLeftInset() + snappedRightInset();
final double controlHeight = control.getHeight();
/**
* RT-26743:TreeTableView: Vertical Line looks unfinished.
* We used to not do layout on cells whose row exceeded the number
* of items, but now we do so as to ensure we get vertical lines
* where expected in cases where the vertical height exceeds the
* number of items.
*/
int index = control.getIndex();
if (index < 0/* || row >= itemsProperty().get().size()*/) return;
for (int column = 0, max = cells.size(); column < max; column++) {
R tableCell = cells.get(column);
TableColumnBase tableColumn = getTableColumn(tableCell);
boolean isVisible = true;
if (fixedCellSizeEnabled) {
// we determine if the cell is visible, and if not we have the
// ability to take it out of the scenegraph to help improve
// performance. However, we only do this when there is a
// fixed cell length specified in the TableView. This is because
// when we have a fixed cell length it is possible to know with
// certainty the height of each TableCell - it is the fixed value
// provided by the developer, and this means that we do not have
// to concern ourselves with the possibility that the height
// may be variable and / or dynamic.
isVisible = isColumnPartiallyOrFullyVisible(tableColumn);
height = fixedCellSize;
} else {
height = Math.max(controlHeight, tableCell.prefHeight(-1));
height = snapSizeY(height) - snapSizeY(verticalPadding);
}
if (isVisible) {
if (fixedCellSizeEnabled && tableCell.getParent() == null) {
getChildren().add(tableCell);
}
width = tableCell.prefWidth(height) - snapSizeX(horizontalPadding);
// Added for RT-32700, and then updated for RT-34074.
// We change the alignment from CENTER_LEFT to TOP_LEFT if the
// height of the row is greater than the default size, and if
// the alignment is the default alignment.
// What I would rather do is only change the alignment if the
// alignment has not been manually changed, but for now this will
// do.
final boolean centreContent = h <= 24.0;
// if the style origin is null then the property has not been
// set (or it has been reset to its default), which means that
// we can set it without overwriting someone elses settings.
final StyleOrigin origin = ((StyleableObjectProperty) tableCell.alignmentProperty()).getStyleOrigin();
if (! centreContent && origin == null) {
tableCell.setAlignment(Pos.TOP_LEFT);
}
// --- end of RT-32700 fix
///////////////////////////////////////////
// further indentation code starts here
///////////////////////////////////////////
if (indentationRequired && column == indentationColumnIndex) {
if (disclosureVisible) {
double ph = disclosureNode.prefHeight(disclosureWidth);
if (width > 0 && width < (disclosureWidth + leftMargin)) {
fadeOut(disclosureNode);
} else {
fadeIn(disclosureNode);
disclosureNode.resize(disclosureWidth, ph);
disclosureNode.relocate(x + leftMargin,
centreContent ? (h / 2.0 - ph / 2.0) :
(y + tableCell.getPadding().getTop()));
disclosureNode.toFront();
}
}
// determine starting point of the graphic or cell node, and the
// remaining width available to them
ObjectProperty graphicProperty = graphicProperty();
Node graphic = graphicProperty == null ? null : graphicProperty.get();
if (graphic != null) {
graphicWidth = graphic.prefWidth(-1) + 3;
double ph = graphic.prefHeight(graphicWidth);
if (width > 0 && width < disclosureWidth + leftMargin + graphicWidth) {
fadeOut(graphic);
} else {
fadeIn(graphic);
graphic.relocate(x + leftMargin + disclosureWidth,
centreContent ? (h / 2.0 - ph / 2.0) :
(y + tableCell.getPadding().getTop()));
graphic.toFront();
}
}
}
///////////////////////////////////////////
// further indentation code ends here
///////////////////////////////////////////
tableCell.resize(width, height);
tableCell.relocate(x, snappedTopInset());
// Request layout is here as (partial) fix for RT-28684.
// This does not appear to impact performance...
tableCell.requestLayout();
} else {
width = snapSizeX(tableCell.prefWidth(-1)) - snapSizeX(horizontalPadding);
if (fixedCellSizeEnabled) {
// we only add/remove to the scenegraph if the fixed cell
// length support is enabled - otherwise we keep all
// TableCells in the scenegraph
getChildren().remove(tableCell);
}
}
x += width;
}
}
int getIndentationLevel(C control) {
return 0;
}
double getIndentationPerLevel() {
return 0;
}
/**
* Used to represent whether the current virtual flow owner is wanting
* indentation to be used in this table row.
*/
boolean isIndentationRequired() {
return false;
}
/**
* Returns the table column that should show the disclosure nodes and / or
* a graphic. By default this is the left-most column.
*/
TableColumnBase getTreeColumn() {
return null;
}
Node getDisclosureNode() {
return null;
}
/**
* Used to represent whether a disclosure node is visible for _this_
* table row. Not to be confused with isIndentationRequired(), which is the
* more general API.
*/
boolean isDisclosureNodeVisible() {
return false;
}
boolean isShowRoot() {
return true;
}
void updateCells(boolean resetChildren) {
// To avoid a potential memory leak (when the TableColumns in the
// TableView are created/inserted/removed/deleted, we have a 'refresh
// counter' that when we reach 0 will delete all cells in this row
// and recreate all of them.
if (resetChildren) {
if (fullRefreshCounter == 0) {
recreateCells();
}
fullRefreshCounter--;
}
// if clear isn't called first, we can run into situations where the
// cells aren't updated properly.
final boolean cellsEmpty = cells.isEmpty();
cells.clear();
final C skinnable = getSkinnable();
final int skinnableIndex = skinnable.getIndex();
final List*/> visibleLeafColumns = getVisibleLeafColumns();
for (int i = 0, max = visibleLeafColumns.size(); i < max; i++) {
TableColumnBase col = visibleLeafColumns.get(i);
R cell = null;
if (cellsMap.containsKey(col)) {
cell = cellsMap.get(col).get();
// the reference has been gc'd, remove key entry from map
if (cell == null) {
cellsMap.remove(col);
}
}
if (cell == null) {
// if the cell is null it means we don't have it in cache and
// need to create it
cell = createCellAndCache(col);
}
updateCell(cell, skinnable);
cell.updateIndex(skinnableIndex);
cells.add(cell);
}
// update children of each row
if (fixedCellSizeEnabled) {
// we leave the adding / removing up to the layoutChildren method mostly, but here we remove any children
// cells that refer to columns that are removed or not visible.
List toRemove = new ArrayList<>();
for (Node cell : getChildren()) {
if (!(cell instanceof IndexedCell)) continue;
TableColumnBase tableColumn = getTableColumn((R) cell);
if (!getVisibleLeafColumns().contains(tableColumn)) {
toRemove.add(cell);
}
}
getChildren().removeAll(toRemove);
} else if (resetChildren || cellsEmpty) {
getChildren().setAll(cells);
}
}
VirtualFlow getVirtualFlow() {
Parent p = getSkinnable();
while (p != null) {
if (p instanceof VirtualFlow) {
return (VirtualFlow) p;
}
p = p.getParent();
}
return null;
}
/** {@inheritDoc} */
@Override protected double computePrefWidth(double height, double topInset, double rightInset, double bottomInset, double leftInset) {
double prefWidth = 0.0;
for (R cell : cells) {
prefWidth += cell.prefWidth(height);
}
return prefWidth;
}
/** {@inheritDoc} */
@Override protected double computePrefHeight(double width, double topInset, double rightInset, double bottomInset, double leftInset) {
if (fixedCellSizeEnabled) {
return fixedCellSize;
}
// fix for RT-29080
checkState();
// Support for RT-18467: making it easier to specify a height for
// cells via CSS, where the desired height is less than the height
// of the TableCells. Essentially, -fx-cell-size is given higher
// precedence now
if (getCellSize() < DEFAULT_CELL_SIZE) {
return getCellSize();
}
// FIXME according to profiling, this method is slow and should
// be optimised
double prefHeight = 0.0f;
final int count = cells.size();
for (int i=0; i virtualFlow = getVirtualFlow();
double scrollX = virtualFlow == null ? 0.0 : virtualFlow.getHbar().getValue();
// work out where this column header is, and it's width (start -> end)
double start = 0;
final ObservableList visibleLeafColumns = getVisibleLeafColumns();
for (int i = 0, max = visibleLeafColumns.size(); i < max; i++) {
TableColumnBase c = visibleLeafColumns.get(i);
if (c.equals(col)) break;
start += c.getWidth();
}
double end = start + col.getWidth();
// determine the width of the table
final Insets padding = getSkinnable().getPadding();
double headerWidth = getSkinnable().getWidth() - padding.getLeft() + padding.getRight();
return (start >= scrollX || end > scrollX) && (start < (headerWidth + scrollX) || end <= (headerWidth + scrollX));
}
private void requestCellUpdate() {
updateCells = true;
getSkinnable().requestLayout();
// update the index of all children cells (RT-29849).
// Note that we do this after the TableRow item has been updated,
// rather than when the TableRow index has changed (as this will be
// before the row has updated its item). This will result in the
// issue highlighted in RT-33602, where the table cell had the correct
// item whilst the row had the old item.
final int newIndex = getSkinnable().getIndex();
for (int i = 0, max = cells.size(); i < max; i++) {
cells.get(i).updateIndex(newIndex);
}
}
private void recreateCells() {
if (cellsMap != null) {
Collection> cells = cellsMap.values();
Iterator> cellsIter = cells.iterator();
while (cellsIter.hasNext()) {
Reference cellRef = cellsIter.next();
R cell = cellRef.get();
if (cell != null) {
cell.updateIndex(-1);
cell.getSkin().dispose();
cell.setSkin(null);
}
}
cellsMap.clear();
}
ObservableList*/> columns = getVisibleLeafColumns();
cellsMap = new WeakHashMap<>(columns.size());
fullRefreshCounter = DEFAULT_FULL_REFRESH_COUNTER;
getChildren().clear();
for (TableColumnBase col : columns) {
if (cellsMap.containsKey(col)) {
continue;
}
// create a TableCell for this column and store it in the cellsMap
// for future use
createCellAndCache(col);
}
}
private R createCellAndCache(TableColumnBase col) {
// we must create a TableCell for this table column
R cell = createCell(col);
// and store this in our HashMap until needed
cellsMap.put(col, new WeakReference<>(cell));
return cell;
}
private void fadeOut(final Node node) {
if (node.getOpacity() < 1.0) return;
if (! DO_ANIMATIONS) {
node.setOpacity(0);
return;
}
final FadeTransition fader = new FadeTransition(FADE_DURATION, node);
fader.setToValue(0.0);
fader.play();
}
private void fadeIn(final Node node) {
if (node.getOpacity() > 0.0) return;
if (! DO_ANIMATIONS) {
node.setOpacity(1);
return;
}
final FadeTransition fader = new FadeTransition(FADE_DURATION, node);
fader.setToValue(1.0);
fader.play();
}
}
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