com.vaadin.client.ui.VGridLayout Maven / Gradle / Ivy
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/*
* Copyright 2000-2016 Vaadin Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.vaadin.client.ui;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;
import com.google.gwt.dom.client.DivElement;
import com.google.gwt.dom.client.Document;
import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.Style;
import com.google.gwt.dom.client.Style.Position;
import com.google.gwt.dom.client.Style.Unit;
import com.google.gwt.user.client.DOM;
import com.google.gwt.user.client.ui.ComplexPanel;
import com.google.gwt.user.client.ui.Widget;
import com.vaadin.client.ApplicationConnection;
import com.vaadin.client.ComponentConnector;
import com.vaadin.client.ConnectorMap;
import com.vaadin.client.LayoutManager;
import com.vaadin.client.StyleConstants;
import com.vaadin.client.Util;
import com.vaadin.client.VCaption;
import com.vaadin.client.ui.gridlayout.GridLayoutConnector;
import com.vaadin.client.ui.layout.ComponentConnectorLayoutSlot;
import com.vaadin.client.ui.layout.VLayoutSlot;
import com.vaadin.shared.ui.AlignmentInfo;
import com.vaadin.shared.ui.MarginInfo;
import com.vaadin.shared.ui.gridlayout.GridLayoutState.ChildComponentData;
public class VGridLayout extends ComplexPanel {
public static final String CLASSNAME = "v-gridlayout";
/** For internal use only. May be removed or replaced in the future. */
public ApplicationConnection client;
/** For internal use only. May be removed or replaced in the future. */
public HashMap widgetToCell = new HashMap<>();
/** For internal use only. May be removed or replaced in the future. */
public int[] columnWidths;
/** For internal use only. May be removed or replaced in the future. */
public int[] rowHeights;
/** For internal use only. May be removed or replaced in the future. */
public float[] colExpandRatioArray;
/** For internal use only. May be removed or replaced in the future. */
public float[] rowExpandRatioArray;
int[] minColumnWidths;
private int[] minRowHeights;
/** For internal use only. May be removed or replaced in the future. */
public DivElement spacingMeasureElement;
public Set explicitRowRatios;
public Set explicitColRatios;
public boolean hideEmptyRowsAndColumns = false;
public VGridLayout() {
super();
setElement(Document.get().createDivElement());
spacingMeasureElement = Document.get().createDivElement();
Style spacingStyle = spacingMeasureElement.getStyle();
spacingStyle.setPosition(Position.ABSOLUTE);
getElement().appendChild(spacingMeasureElement);
setStyleName(CLASSNAME);
addStyleName(StyleConstants.UI_LAYOUT);
}
private GridLayoutConnector getConnector() {
return (GridLayoutConnector) ConnectorMap.get(client)
.getConnector(this);
}
/**
* Returns the column widths measured in pixels
*
* @return
*/
protected int[] getColumnWidths() {
return columnWidths;
}
/**
* Returns the row heights measured in pixels
*
* @return
*/
protected int[] getRowHeights() {
return rowHeights;
}
/**
* Returns the spacing between the cells horizontally in pixels
*
* @return
*/
protected int getHorizontalSpacing() {
return LayoutManager.get(client).getOuterWidth(spacingMeasureElement);
}
/**
* Returns the spacing between the cells vertically in pixels
*
* @return
*/
protected int getVerticalSpacing() {
return LayoutManager.get(client).getOuterHeight(spacingMeasureElement);
}
static int[] cloneArray(int[] toBeCloned) {
int[] clone = new int[toBeCloned.length];
for (int i = 0; i < clone.length; i++) {
clone[i] = toBeCloned[i] * 1;
}
return clone;
}
void expandRows() {
if (!isUndefinedHeight()) {
int usedSpace = calcRowUsedSpace();
float[] actualExpandRatio = calcRowExpandRatio();
// Round down to avoid problems with fractions (100.1px available ->
// can use 100, not 101)
int availableSpace = (int) LayoutManager.get(client)
.getInnerHeightDouble(getElement());
int excessSpace = availableSpace - usedSpace;
int distributed = 0;
if (excessSpace > 0) {
float expandRatioSum = 0;
for (int i = 0; i < rowHeights.length; i++) {
expandRatioSum += actualExpandRatio[i];
}
for (int i = 0; i < rowHeights.length; i++) {
int ew = (int) (excessSpace * actualExpandRatio[i]
/ expandRatioSum);
rowHeights[i] = minRowHeights[i] + ew;
distributed += ew;
}
excessSpace -= distributed;
int c = 0;
while (excessSpace > 0) {
rowHeights[c % rowHeights.length]++;
excessSpace--;
c++;
}
}
}
}
private float[] calcRowExpandRatio() {
float[] actualExpandRatio = new float[minRowHeights.length];
for (int i = 0; i < minRowHeights.length; i++) {
if (hiddenEmptyRow(i)) {
actualExpandRatio[i] = 0;
} else {
actualExpandRatio[i] = rowExpandRatioArray[i];
}
}
return actualExpandRatio;
}
/**
* Checks if it is ok to hide (or ignore) the given row.
*
* @param rowIndex
* the row to check
* @return true, if the row should be interpreted as non-existant (hides
* extra spacing)
*/
private boolean hiddenEmptyRow(int rowIndex) {
return hideEmptyRowsAndColumns && !rowHasComponentsOrRowSpan(rowIndex)
&& !explicitRowRatios.contains(rowIndex);
}
/**
* Checks if it is ok to hide (or ignore) the given column.
*
* @param columnIndex
* the column to check
* @return true, if the column should be interpreted as non-existant (hides
* extra spacing)
*/
private boolean hiddenEmptyColumn(int columnIndex) {
return hideEmptyRowsAndColumns
&& !colHasComponentsOrColSpan(columnIndex)
&& !explicitColRatios.contains(columnIndex);
}
private int calcRowUsedSpace() {
int usedSpace = minRowHeights[0];
int verticalSpacing = getVerticalSpacing();
for (int i = 1; i < minRowHeights.length; i++) {
if (minRowHeights[i] > 0 || !hiddenEmptyRow(i)) {
usedSpace += verticalSpacing + minRowHeights[i];
}
}
return usedSpace;
}
void expandColumns() {
if (!isUndefinedWidth()) {
int usedSpace = calcColumnUsedSpace();
float[] actualExpandRatio = calcColumnExpandRatio();
// Round down to avoid problems with fractions (100.1px available ->
// can use 100, not 101)
int availableSpace = (int) LayoutManager.get(client)
.getInnerWidthDouble(getElement());
int excessSpace = availableSpace - usedSpace;
int distributed = 0;
if (excessSpace > 0) {
float expandRatioSum = 0;
for (int i = 0; i < columnWidths.length; i++) {
expandRatioSum += actualExpandRatio[i];
}
for (int i = 0; i < columnWidths.length; i++) {
int ew = (int) (excessSpace * actualExpandRatio[i]
/ expandRatioSum);
columnWidths[i] = minColumnWidths[i] + ew;
distributed += ew;
}
excessSpace -= distributed;
int c = 0;
while (excessSpace > 0) {
columnWidths[c % columnWidths.length]++;
excessSpace--;
c++;
}
}
}
}
/**
* Calculates column expand ratio.
*/
private float[] calcColumnExpandRatio() {
float[] actualExpandRatio = new float[minColumnWidths.length];
for (int i = 0; i < minColumnWidths.length; i++) {
if (!hiddenEmptyColumn(i)) {
actualExpandRatio[i] = colExpandRatioArray[i];
} else {
actualExpandRatio[i] = 0;
}
}
return actualExpandRatio;
}
/**
* Calculates column used space
*/
private int calcColumnUsedSpace() {
int usedSpace = minColumnWidths[0];
int horizontalSpacing = getHorizontalSpacing();
for (int i = 1; i < minColumnWidths.length; i++) {
if (minColumnWidths[i] > 0 || !hiddenEmptyColumn(i)) {
usedSpace += horizontalSpacing + minColumnWidths[i];
}
}
return usedSpace;
}
private boolean rowHasComponentsOrRowSpan(int i) {
for (Cell cell : widgetToCell.values()) {
if (cell.row == i) {
return true;
}
}
for (SpanList l : rowSpans) {
for (Cell cell : l.cells) {
if (cell.row <= i && i < cell.row + cell.rowspan) {
return true;
}
}
}
return false;
}
private boolean colHasComponentsOrColSpan(int i) {
for (Cell cell : widgetToCell.values()) {
if (cell.col == i) {
return true;
}
}
for (SpanList l : colSpans) {
for (Cell cell : l.cells) {
if (cell.col <= i && i < cell.col + cell.colspan) {
return true;
}
}
}
return false;
}
/** For internal use only. May be removed or replaced in the future. */
public void updateHeight() {
// Detect minimum heights & calculate spans
detectRowHeights();
// Expand
expandRows();
// Position
layoutCellsVertically();
}
/** For internal use only. May be removed or replaced in the future. */
public void updateWidth() {
// Detect widths & calculate spans
detectColWidths();
// Expand
expandColumns();
// Position
layoutCellsHorizontally();
}
void layoutCellsVertically() {
int verticalSpacing = getVerticalSpacing();
LayoutManager layoutManager = LayoutManager.get(client);
Element element = getElement();
int paddingTop = layoutManager.getPaddingTop(element);
int paddingBottom = layoutManager.getPaddingBottom(element);
int y = paddingTop;
for (int column = 0; column < cells.length; column++) {
y = paddingTop + 1 - 1; // Ensure IE10 does not optimize this out by
// adding something to evaluate on the RHS
// #11303
for (int row = 0; row < cells[column].length; row++) {
Cell cell = cells[column][row];
if (cell != null) {
int reservedMargin;
if (cell.rowspan + row >= cells[column].length) {
// Make room for layout padding for cells reaching the
// bottom of the layout
reservedMargin = paddingBottom;
} else {
reservedMargin = 0;
}
cell.layoutVertically(y, reservedMargin);
}
if (!hideEmptyRowsAndColumns || rowHasComponentsOrRowSpan(row)
|| rowHeights[row] > 0) {
y += rowHeights[row] + verticalSpacing;
}
}
}
if (isUndefinedHeight()) {
int outerHeight = y - verticalSpacing
+ layoutManager.getPaddingBottom(element)
+ layoutManager.getBorderHeight(element);
element.getStyle().setHeight(outerHeight, Unit.PX);
getConnector().getLayoutManager().reportOuterHeight(getConnector(),
outerHeight);
}
}
void layoutCellsHorizontally() {
LayoutManager layoutManager = LayoutManager.get(client);
Element element = getElement();
int x = layoutManager.getPaddingLeft(element);
int paddingRight = layoutManager.getPaddingRight(element);
int horizontalSpacing = getHorizontalSpacing();
for (int i = 0; i < cells.length; i++) {
for (int j = 0; j < cells[i].length; j++) {
Cell cell = cells[i][j];
if (cell != null) {
int reservedMargin;
// Make room for layout padding for cells reaching the
// right edge of the layout
if (i + cell.colspan >= cells.length) {
reservedMargin = paddingRight;
} else {
reservedMargin = 0;
}
cell.layoutHorizontally(x, reservedMargin);
}
}
if (!hideEmptyRowsAndColumns || colHasComponentsOrColSpan(i)
|| columnWidths[i] > 0) {
x += columnWidths[i] + horizontalSpacing;
}
}
if (isUndefinedWidth()) {
int outerWidth = x - horizontalSpacing
+ layoutManager.getPaddingRight(element)
+ layoutManager.getBorderWidth(element);
element.getStyle().setWidth(outerWidth, Unit.PX);
getConnector().getLayoutManager().reportOuterWidth(getConnector(),
outerWidth);
}
}
private boolean isUndefinedHeight() {
return getConnector().isUndefinedHeight();
}
private boolean isUndefinedWidth() {
return getConnector().isUndefinedWidth();
}
private void detectRowHeights() {
for (int i = 0; i < rowHeights.length; i++) {
rowHeights[i] = 0;
}
// collect min rowheight from non-rowspanned cells
for (int i = 0; i < cells.length; i++) {
for (int j = 0; j < cells[i].length; j++) {
Cell cell = cells[i][j];
if (cell != null) {
if (cell.rowspan == 1) {
if (!cell.hasRelativeHeight()
&& rowHeights[j] < cell.getHeight()) {
rowHeights[j] = cell.getHeight();
}
} else {
storeRowSpannedCell(cell);
}
}
}
}
distributeRowSpanHeights();
minRowHeights = cloneArray(rowHeights);
}
private void detectColWidths() {
// collect min colwidths from non-colspanned cells
for (int i = 0; i < columnWidths.length; i++) {
columnWidths[i] = 0;
}
for (int i = 0; i < cells.length; i++) {
for (int j = 0; j < cells[i].length; j++) {
Cell cell = cells[i][j];
if (cell != null) {
if (cell.colspan == 1) {
if (!cell.hasRelativeWidth()
&& columnWidths[i] < cell.getWidth()) {
columnWidths[i] = cell.getWidth();
}
} else {
storeColSpannedCell(cell);
}
}
}
}
distributeColSpanWidths();
minColumnWidths = cloneArray(columnWidths);
}
private void storeRowSpannedCell(Cell cell) {
SpanList l = null;
for (SpanList list : rowSpans) {
if (list.span < cell.rowspan) {
continue;
} else {
// insert before this
l = list;
break;
}
}
if (l == null) {
l = new SpanList(cell.rowspan);
rowSpans.add(l);
} else if (l.span != cell.rowspan) {
SpanList newL = new SpanList(cell.rowspan);
rowSpans.add(rowSpans.indexOf(l), newL);
l = newL;
}
l.cells.add(cell);
}
/**
* Iterates colspanned cells, ensures cols have enough space to accommodate
* them
*/
void distributeColSpanWidths() {
for (SpanList list : colSpans) {
for (Cell cell : list.cells) {
// cells with relative content may return non 0 here if on
// subsequent renders
int width = cell.hasRelativeWidth() ? 0 : cell.getWidth();
distributeSpanSize(columnWidths, cell.col, cell.colspan,
getHorizontalSpacing(), width, colExpandRatioArray);
}
}
}
/**
* Iterates rowspanned cells, ensures rows have enough space to accommodate
* them
*/
private void distributeRowSpanHeights() {
for (SpanList list : rowSpans) {
for (Cell cell : list.cells) {
// cells with relative content may return non 0 here if on
// subsequent renders
int height = cell.hasRelativeHeight() ? 0 : cell.getHeight();
distributeSpanSize(rowHeights, cell.row, cell.rowspan,
getVerticalSpacing(), height, rowExpandRatioArray);
}
}
}
private static void distributeSpanSize(int[] dimensions, int spanStartIndex,
int spanSize, int spacingSize, int size, float[] expansionRatios) {
int allocated = dimensions[spanStartIndex];
for (int i = 1; i < spanSize; i++) {
allocated += spacingSize + dimensions[spanStartIndex + i];
}
if (allocated < size) {
// dimensions needs to be expanded due spanned cell
int neededExtraSpace = size - allocated;
int allocatedExtraSpace = 0;
// Divide space according to expansion ratios if any span has a
// ratio
int totalExpansion = 0;
for (int i = 0; i < spanSize; i++) {
int itemIndex = spanStartIndex + i;
totalExpansion += expansionRatios[itemIndex];
}
for (int i = 0; i < spanSize; i++) {
int itemIndex = spanStartIndex + i;
int expansion;
if (totalExpansion == 0) {
// Divide equally among all cells if there are no
// expansion ratios
expansion = neededExtraSpace / spanSize;
} else {
expansion = (int) (neededExtraSpace
* expansionRatios[itemIndex] / totalExpansion);
}
dimensions[itemIndex] += expansion;
allocatedExtraSpace += expansion;
}
// We might still miss a couple of pixels because of
// rounding errors...
if (neededExtraSpace > allocatedExtraSpace) {
for (int i = 0; i < spanSize; i++) {
// Add one pixel to every cell until we have
// compensated for any rounding error
int itemIndex = spanStartIndex + i;
dimensions[itemIndex] += 1;
allocatedExtraSpace += 1;
if (neededExtraSpace == allocatedExtraSpace) {
break;
}
}
}
}
}
private LinkedList colSpans = new LinkedList<>();
private LinkedList rowSpans = new LinkedList<>();
private class SpanList {
final int span;
List cells = new LinkedList<>();
public SpanList(int span) {
this.span = span;
}
}
void storeColSpannedCell(Cell cell) {
SpanList l = null;
for (SpanList list : colSpans) {
if (list.span < cell.colspan) {
continue;
} else {
// insert before this
l = list;
break;
}
}
if (l == null) {
l = new SpanList(cell.colspan);
colSpans.add(l);
} else if (l.span != cell.colspan) {
SpanList newL = new SpanList(cell.colspan);
colSpans.add(colSpans.indexOf(l), newL);
l = newL;
}
l.cells.add(cell);
}
Cell[][] cells;
/**
* Private helper class.
*/
/** For internal use only. May be removed or replaced in the future. */
public class Cell {
public Cell(int row, int col) {
this.row = row;
this.col = col;
}
public boolean hasRelativeHeight() {
if (slot != null) {
return slot.getChild().isRelativeHeight();
} else {
return true;
}
}
/**
* @return total of spanned cols
*/
private int getAvailableWidth() {
int width = columnWidths[col];
for (int i = 1; i < colspan; i++) {
width += getHorizontalSpacing() + columnWidths[col + i];
}
return width;
}
/**
* @return total of spanned rows
*/
private int getAvailableHeight() {
int height = rowHeights[row];
for (int i = 1; i < rowspan; i++) {
height += getVerticalSpacing() + rowHeights[row + i];
}
return height;
}
public void layoutHorizontally(int x, int marginRight) {
if (slot != null) {
slot.positionHorizontally(x, getAvailableWidth(), marginRight);
}
}
public void layoutVertically(int y, int marginBottom) {
if (slot != null) {
slot.positionVertically(y, getAvailableHeight(), marginBottom);
}
}
public int getWidth() {
if (slot != null) {
return slot.getUsedWidth();
} else {
return 0;
}
}
public int getHeight() {
if (slot != null) {
return slot.getUsedHeight();
} else {
return 0;
}
}
protected boolean hasRelativeWidth() {
if (slot != null) {
return slot.getChild().isRelativeWidth();
} else {
return true;
}
}
private int row;
private int col;
int colspan = 1;
int rowspan = 1;
private AlignmentInfo alignment;
/** For internal use only. May be removed or replaced in the future. */
public ComponentConnectorLayoutSlot slot;
public void updateCell(ChildComponentData childComponentData) {
if (row != childComponentData.row1
|| col != childComponentData.column1) {
// cell has been moved, update matrix
if (col < cells.length && cells.length != 0
&& row < cells[0].length && cells[col][row] == this) {
// Remove old reference if still relevant
cells[col][row] = null;
}
row = childComponentData.row1;
col = childComponentData.column1;
cells[col][row] = this;
}
// Set cell width
colspan = 1 + childComponentData.column2
- childComponentData.column1;
// Set cell height
rowspan = 1 + childComponentData.row2 - childComponentData.row1;
setAlignment(new AlignmentInfo(childComponentData.alignment));
}
public void setComponent(ComponentConnector component,
List ordering) {
if (slot == null || slot.getChild() != component) {
slot = new ComponentConnectorLayoutSlot(CLASSNAME, component,
getConnector());
slot.setAlignment(alignment);
if (component.isRelativeWidth()) {
slot.getWrapperElement().getStyle().setWidth(100, Unit.PCT);
}
Element slotWrapper = slot.getWrapperElement();
int childIndex = ordering.indexOf(component);
// insert new slot by proper index
// do not break default focus order
com.google.gwt.user.client.Element element = getElement();
if (childIndex == ordering.size()) {
element.appendChild(slotWrapper);
} else if (childIndex == 0) {
element.insertAfter(slotWrapper, spacingMeasureElement);
} else {
// here we use childIndex - 1 + 1(spacingMeasureElement)
Element previousSlot = (Element) element
.getChild(childIndex);
element.insertAfter(slotWrapper, previousSlot);
}
Widget widget = component.getWidget();
insert(widget, slotWrapper, getWidgetCount(), false);
Cell oldCell = widgetToCell.put(widget, this);
if (oldCell != null) {
oldCell.slot.getWrapperElement().removeFromParent();
oldCell.slot = null;
}
}
}
public void setAlignment(AlignmentInfo alignmentInfo) {
alignment = alignmentInfo;
if (slot != null) {
slot.setAlignment(alignmentInfo);
}
}
}
/** For internal use only. May be removed or replaced in the future. */
public Cell getCell(int row, int col) {
return cells[col][row];
}
/**
* Creates a new Cell with the given coordinates.
*
* For internal use only. May be removed or replaced in the future.
*
* @param row
* @param col
* @return
*/
public Cell createNewCell(int row, int col) {
Cell cell = new Cell(row, col);
cells[col][row] = cell;
return cell;
}
/**
* Returns the deepest nested child component which contains "element". The
* child component is also returned if "element" is part of its caption.
*
* For internal use only. May be removed or replaced in the future.
*
* @param element
* An element that is a nested sub element of the root element in
* this layout
* @return The Paintable which the element is a part of. Null if the element
* belongs to the layout and not to a child.
* @deprecated As of 7.2, call or override {@link #getComponent(Element)}
* instead
*/
@Deprecated
public ComponentConnector getComponent(
com.google.gwt.user.client.Element element) {
return Util.getConnectorForElement(client, this, element);
}
/**
* Returns the deepest nested child component which contains "element". The
* child component is also returned if "element" is part of its caption.
*
* For internal use only. May be removed or replaced in the future.
*
* @param element
* An element that is a nested sub element of the root element in
* this layout
* @return The Paintable which the element is a part of. Null if the element
* belongs to the layout and not to a child.
*
* @since 7.2
*/
public ComponentConnector getComponent(Element element) {
return getComponent(DOM.asOld(element));
}
/** For internal use only. May be removed or replaced in the future. */
public void setCaption(Widget widget, VCaption caption) {
VLayoutSlot slot = widgetToCell.get(widget).slot;
if (caption != null) {
// Logical attach.
getChildren().add(caption);
}
// Physical attach if not null, also removes old caption
slot.setCaption(caption);
if (caption != null) {
// Adopt.
adopt(caption);
}
}
private void togglePrefixedStyleName(String name, boolean enabled) {
if (enabled) {
addStyleDependentName(name);
} else {
removeStyleDependentName(name);
}
}
/** For internal use only. May be removed or replaced in the future. */
public void updateMarginStyleNames(MarginInfo marginInfo) {
togglePrefixedStyleName("margin-top", marginInfo.hasTop());
togglePrefixedStyleName("margin-right", marginInfo.hasRight());
togglePrefixedStyleName("margin-bottom", marginInfo.hasBottom());
togglePrefixedStyleName("margin-left", marginInfo.hasLeft());
}
/** For internal use only. May be removed or replaced in the future. */
public void updateSpacingStyleName(boolean spacingEnabled) {
String styleName = getStylePrimaryName();
if (spacingEnabled) {
spacingMeasureElement.addClassName(styleName + "-spacing-on");
spacingMeasureElement.removeClassName(styleName + "-spacing-off");
} else {
spacingMeasureElement.removeClassName(styleName + "-spacing-on");
spacingMeasureElement.addClassName(styleName + "-spacing-off");
}
}
public void setSize(int rows, int cols) {
if (cells == null) {
cells = new Cell[cols][rows];
} else if (cells.length != cols || cells[0].length != rows) {
Cell[][] newCells = new Cell[cols][rows];
for (int i = 0; i < cells.length; i++) {
for (int j = 0; j < cells[i].length; j++) {
if (i < cols && j < rows) {
newCells[i][j] = cells[i][j];
}
}
}
cells = newCells;
}
}
@Override
public boolean remove(Widget w) {
boolean removed = super.remove(w);
if (removed) {
Cell cell = widgetToCell.remove(w);
if (cell != null) {
cell.slot.setCaption(null);
cell.slot.getWrapperElement().removeFromParent();
cell.slot = null;
Style style = w.getElement().getStyle();
style.clearTop();
style.clearLeft();
style.clearPosition();
if (cells.length < cell.col && cells.length != 0
&& cells[0].length < cell.row
&& cells[cell.col][cell.row] == cell) {
cells[cell.col][cell.row] = null;
}
}
}
return removed;
}
}
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