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Open HTML to PDF is a CSS 2.1 renderer written in Java. This artifact contains the core rendering and layout code.
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/*
* {{{ header & license
* Copyright (c) 2007 Wisconsin Court System
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1
* of the License, or (at your option) any later version.
*
* This program 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
* }}}
*/
package com.openhtmltopdf.newtable;
import java.awt.Rectangle;
import java.io.IOException;
import java.io.Writer;
import java.util.List;
import com.openhtmltopdf.css.constants.CSSName;
import com.openhtmltopdf.css.constants.IdentValue;
import com.openhtmltopdf.css.style.CssContext;
import com.openhtmltopdf.css.style.derived.BorderPropertySet;
import com.openhtmltopdf.css.style.derived.RectPropertySet;
import com.openhtmltopdf.layout.LayoutContext;
import com.openhtmltopdf.render.BlockBox;
import com.openhtmltopdf.render.Box;
import com.openhtmltopdf.render.ContentLimitContainer;
import com.openhtmltopdf.render.PageBox;
import com.openhtmltopdf.render.RenderingContext;
public class TableRowBox extends BlockBox {
private int _baseline;
private boolean _haveBaseline = false;
private int _heightOverride;
private ContentLimitContainer _contentLimitContainer;
private int _extraSpaceTop;
private int _extraSpaceBottom;
public TableRowBox() {
}
@Override
public BlockBox copyOf() {
TableRowBox result = new TableRowBox();
result.setStyle(getStyle());
result.setElement(getElement());
return result;
}
private Iterable getTableCells() {
return () -> getChildIteratorOfType(TableCellBox.class);
}
@Override
public boolean isAutoHeight() {
return getStyle().isAutoHeight() || ! getStyle().hasAbsoluteUnit(CSSName.HEIGHT);
}
private TableBox getTable() {
// row -> section -> table
return (TableBox)getParent().getParent();
}
private TableSectionBox getSection() {
return (TableSectionBox)getParent();
}
@Override
public void layout(LayoutContext c, int contentStart) {
boolean running = c.isPrint() && getTable().getStyle().isPaginateTable();
int prevExtraTop = 0;
int prevExtraBottom = 0;
if (running) {
prevExtraTop = c.getExtraSpaceTop();
prevExtraBottom = c.getExtraSpaceBottom();
calcExtraSpaceTop(c);
calcExtraSpaceBottom(c);
c.setExtraSpaceTop(c.getExtraSpaceTop() + getExtraSpaceTop());
c.setExtraSpaceBottom(c.getExtraSpaceBottom() + getExtraSpaceBottom());
}
super.layout(c, contentStart);
if (running) {
if (isShouldMoveToNextPage(c)) {
if (getTable().getFirstBodyRow() == this) {
// XXX Performance problem here. This forces the table
// to move to the next page (which we want), but the initial
// table layout run still completes (which we don't)
getTable().setNeedPageClear(true);
} else {
setNeedPageClear(true);
}
}
c.setExtraSpaceTop(prevExtraTop);
c.setExtraSpaceBottom(prevExtraBottom);
}
}
private boolean isShouldMoveToNextPage(LayoutContext c) {
PageBox page = c.getRootLayer().getFirstPage(c, this);
int pageBottomUsable = page.getBottom(c);
if (getAbsY() + getHeight() < pageBottomUsable) {
return false;
}
for (TableCellBox cell : getTableCells()) {
int baseline = cell.calcBlockBaseline(c);
if (baseline != BlockBox.NO_BASELINE && baseline < pageBottomUsable) {
return false;
}
}
return true;
}
@Override
public void analyzePageBreaks(LayoutContext c, ContentLimitContainer container) {
if (getTable().getStyle().isPaginateTable()) {
_contentLimitContainer = new ContentLimitContainer(c, getAbsY());
_contentLimitContainer.setParent(container);
if (container != null) {
container.updateTop(c, getAbsY());
container.updateBottom(c, getAbsY() + getHeight());
}
for (Box b : getChildren()) {
b.analyzePageBreaks(c, _contentLimitContainer);
}
if (container != null && _contentLimitContainer.isContainsMultiplePages()) {
propagateExtraSpace(c, container, _contentLimitContainer, getExtraSpaceTop(), getExtraSpaceBottom());
}
} else {
super.analyzePageBreaks(c, container);
}
}
private void calcExtraSpaceTop(LayoutContext c) {
int maxBorderAndPadding = 0;
for (TableCellBox cell : getTableCells()) {
int borderAndPadding = (int)cell.getPadding(c).top() + (int)cell.getBorder(c).top();
if (borderAndPadding > maxBorderAndPadding) {
maxBorderAndPadding = borderAndPadding;
}
}
_extraSpaceTop = maxBorderAndPadding;
}
private void calcExtraSpaceBottom(LayoutContext c) {
int maxBorderAndPadding = 0;
int cRow = getIndex();
int totalRows = getSection().numRows();
List grid = getSection().getGrid();
if ((grid.size() > 0) && (cRow < grid.size())) {
List row = grid.get(cRow).getRow();
for (int cCol = 0; cCol < row.size(); cCol++) {
TableCellBox cell = row.get(cCol);
if (cell == null || cell == TableCellBox.SPANNING_CELL) {
continue;
}
if (cRow < totalRows - 1 && getSection().cellAt(cRow+1, cCol) == cell) {
continue;
}
int borderAndPadding = (int)cell.getPadding(c).bottom() + (int)cell.getBorder(c).bottom();
if (borderAndPadding > maxBorderAndPadding) {
maxBorderAndPadding = borderAndPadding;
}
}
}
_extraSpaceBottom = maxBorderAndPadding;
}
@Override
protected void layoutChildren(LayoutContext c, int contentStart) {
setState(Box.CHILDREN_FLUX);
ensureChildren(c);
TableSectionBox section = getSection();
if (section.isNeedCellWidthCalc()) {
section.setCellWidths(c);
section.setNeedCellWidthCalc(false);
}
if (getChildrenContentType() != ContentType.EMPTY) {
for (TableCellBox cell : getTableCells()) {
layoutCell(c, cell, 0);
}
}
setState(Box.DONE);
}
private void alignBaselineAlignedCells(LayoutContext c) {
int[] baselines = new int[getChildCount()];
int lowest = Integer.MIN_VALUE;
boolean found = false;
for (int i = 0; i < getChildCount(); i++) {
TableCellBox cell = (TableCellBox)getChild(i);
if (cell.getVerticalAlign() == IdentValue.BASELINE) {
int baseline = cell.calcBaseline(c);
baselines[i] = baseline;
if (baseline > lowest) {
lowest = baseline;
}
found = true;
}
}
if (found) {
for (int i = 0; i < getChildCount(); i++) {
TableCellBox cell = (TableCellBox)getChild(i);
if (cell.getVerticalAlign() == IdentValue.BASELINE) {
int deltaY = lowest - baselines[i];
if (deltaY != 0) {
if (c.isPrint() && cell.isPageBreaksChange(c, deltaY)) {
relayoutCell(c, cell, deltaY);
} else {
cell.moveContent(c, deltaY);
cell.setHeight(cell.getHeight() + deltaY);
}
}
}
}
setBaseline(lowest - getAbsY());
setHaveBaseline(true);
}
}
private boolean alignMiddleAndBottomAlignedCells(LayoutContext c) {
boolean needRowHeightRecalc = false;
int cRow = getIndex();
int totalRows = getSection().numRows();
List grid = getSection().getGrid();
if ((grid.size() > 0) && (cRow < grid.size())) {
List row = grid.get(cRow).getRow();
for (int cCol = 0; cCol < row.size(); cCol++) {
TableCellBox cell = row.get(cCol);
if (cell == null || cell == TableCellBox.SPANNING_CELL) {
continue;
}
if (cRow < totalRows - 1 && getSection().cellAt(cRow+1, cCol) == cell) {
continue;
}
IdentValue val = cell.getVerticalAlign();
if (val == IdentValue.MIDDLE || val == IdentValue.BOTTOM) {
int deltaY = calcMiddleBottomDeltaY(cell, val);
if (deltaY > 0) {
if (c.isPrint() && cell.isPageBreaksChange(c, deltaY)) {
int oldCellHeight = cell.getHeight();
relayoutCell(c, cell, deltaY);
if (oldCellHeight + deltaY != cell.getHeight()) {
needRowHeightRecalc = true;
}
} else {
cell.moveContent(c, deltaY);
// Set a provisional height in case we need to calculate
// a default baseline
cell.setHeight(cell.getHeight() + deltaY);
}
}
}
}
}
return needRowHeightRecalc;
}
private int calcMiddleBottomDeltaY(TableCellBox cell, IdentValue verticalAlign) {
int result;
if (cell.getStyle().getRowSpan() == 1) {
result = getHeight() - cell.getChildrenHeight();
} else {
result = getAbsY() + getHeight() - (cell.getAbsY() + cell.getChildrenHeight());
}
if (verticalAlign == IdentValue.MIDDLE) {
return result / 2;
} else { /* verticalAlign == IdentValue.BOTTOM */
return result;
}
}
@Override
protected void calcLayoutHeight(
LayoutContext c, BorderPropertySet border,
RectPropertySet margin, RectPropertySet padding) {
if (getHeightOverride() > 0) {
setHeight(getHeightOverride());
}
alignBaselineAlignedCells(c);
calcRowHeight(c);
boolean recalcRowHeight = alignMiddleAndBottomAlignedCells(c);
if (recalcRowHeight) {
calcRowHeight(c);
}
if (! isHaveBaseline()) {
calcDefaultBaseline(c);
}
setCellHeights(c);
}
private void calcRowHeight(CssContext c) {
int y1 = getAbsY();
int y2;
if (getHeight() != 0) {
y2 = y1 + getHeight();
} else {
y2 = y1;
}
if (isLastRow()) {
int bottom = getTable().calcFixedHeightRowBottom(c);
if (bottom > 0 && bottom > y2) {
y2 = bottom;
}
}
int cRow = getIndex();
int totalRows = getSection().numRows();
List grid = getSection().getGrid();
if ((grid.size() > 0) && (cRow < grid.size())) {
List row = grid.get(cRow).getRow();
for (int cCol = 0; cCol < row.size(); cCol++) {
TableCellBox cell = row.get(cCol);
if (cell == null || cell == TableCellBox.SPANNING_CELL) {
continue;
}
if (cRow < totalRows - 1 && getSection().cellAt(cRow+1, cCol) == cell) {
continue;
}
int bottomCellEdge = cell.getAbsY() + cell.getHeight();
if (bottomCellEdge > y2) {
y2 = bottomCellEdge;
}
}
}
setHeight(y2 - y1);
}
private boolean isLastRow() {
TableBox table = getTable();
TableSectionBox section = getSection();
if (table.sectionBelow(section, true) == null) {
return section.getChild(section.getChildCount()-1) == this;
} else {
return false;
}
}
private void calcDefaultBaseline(LayoutContext c) {
int lowestCellEdge = 0;
int cRow = getIndex();
int totalRows = getSection().numRows();
List grid = getSection().getGrid();
if ((grid.size() > 0) && (cRow < grid.size())) {
List row = grid.get(cRow).getRow();
for (int cCol = 0; cCol < row.size(); cCol++) {
TableCellBox cell = row.get(cCol);
if (cell == null || cell == TableCellBox.SPANNING_CELL) {
continue;
}
if (cRow < totalRows - 1 && getSection().cellAt(cRow+1, cCol) == cell) {
continue;
}
Rectangle contentArea = cell.getContentAreaEdge(cell.getAbsX(), cell.getAbsY(), c);
int bottomCellEdge = contentArea.y + contentArea.height;
if (bottomCellEdge > lowestCellEdge) {
lowestCellEdge = bottomCellEdge;
}
}
}
if (lowestCellEdge > 0) {
setBaseline(lowestCellEdge - getAbsY());
}
setHaveBaseline(true);
}
private void setCellHeights(LayoutContext c) {
int cRow = getIndex();
int totalRows = getSection().numRows();
List grid = getSection().getGrid();
if ((grid.size() > 0) && (cRow < grid.size())) {
List row = grid.get(cRow).getRow();
for (int cCol = 0; cCol < row.size(); cCol++) {
TableCellBox cell = row.get(cCol);
if (cell == null || cell == TableCellBox.SPANNING_CELL) {
continue;
}
if (cRow < totalRows - 1 && getSection().cellAt(cRow+1, cCol) == cell) {
continue;
}
if (cell.getStyle().getRowSpan() == 1) {
cell.setHeight(getHeight());
} else {
cell.setHeight(getAbsY() + getHeight() - cell.getAbsY());
}
}
}
}
private void relayoutCell(LayoutContext c, TableCellBox cell, int contentStart) {
int width = cell.getWidth();
cell.reset(c);
cell.setLayoutWidth(c, width);
layoutCell(c, cell, contentStart);
}
private void layoutCell(LayoutContext c, TableCellBox cell, int contentStart) {
cell.initContainingLayer(c);
cell.calcCanvasLocation();
cell.layout(c, contentStart);
}
@Override
public void initStaticPos(LayoutContext c, BlockBox parent, int childOffset) {
setX(0);
TableBox table = getTable();
setY(parent.getHeight() + table.getStyle().getBorderVSpacing(c));
c.translate(0, getY()-childOffset);
}
public int getBaseline() {
return _baseline;
}
public void setBaseline(int baseline) {
_baseline = baseline;
}
@Override
protected boolean isSkipWhenCollapsingMargins() {
return true;
}
@Override
public void paintBorder(RenderingContext c) {
// rows never have borders
}
@Override
public void paintBackground(RenderingContext c) {
// painted at the cell level
}
@Override
public void reset(LayoutContext c) {
super.reset(c);
setHaveBaseline(false);
getSection().setNeedCellWidthCalc(true);
setContentLimitContainer(null);
}
public boolean isHaveBaseline() {
return _haveBaseline;
}
public void setHaveBaseline(boolean haveBaseline) {
_haveBaseline = haveBaseline;
}
@Override
protected String getExtraBoxDescription() {
if (isHaveBaseline()) {
return "(baseline=" + getBaseline() + ") ";
} else {
return "";
}
}
public int getHeightOverride() {
return _heightOverride;
}
public void setHeightOverride(int heightOverride) {
_heightOverride = heightOverride;
}
@Override
public void exportText(RenderingContext c, Writer writer) throws IOException {
if (getTable().isMarginAreaRoot()) {
super.exportText(c, writer);
} else {
int yPos = getAbsY();
if (yPos >= c.getPage().getBottom() && isInDocumentFlow()) {
exportPageBoxText(c, writer, yPos);
}
for (TableCellBox cell : getTableCells()) {
StringBuilder buffer = new StringBuilder();
cell.collectText(c, buffer);
writer.write(buffer.toString().trim());
int cSpan = cell.getStyle().getColSpan();
for (int j = 0; j < cSpan; j++) {
writer.write('\t');
}
}
writer.write(LINE_SEPARATOR);
}
}
public ContentLimitContainer getContentLimitContainer() {
return _contentLimitContainer;
}
public void setContentLimitContainer(ContentLimitContainer contentLimitContainer) {
_contentLimitContainer = contentLimitContainer;
}
public int getExtraSpaceTop() {
return _extraSpaceTop;
}
public void setExtraSpaceTop(int extraSpaceTop) {
_extraSpaceTop = extraSpaceTop;
}
public int getExtraSpaceBottom() {
return _extraSpaceBottom;
}
public void setExtraSpaceBottom(int extraSpaceBottom) {
_extraSpaceBottom = extraSpaceBottom;
}
@Override
public int forcePageBreakBefore(LayoutContext c, IdentValue pageBreakValue,
boolean pendingPageName) {
int currentDelta = super.forcePageBreakBefore(c, pageBreakValue, pendingPageName);
// additional calculations for collapsed borders.
if (c.isPrint() && getStyle().isCollapseBorders()) {
// get destination page for this row
PageBox page = c.getRootLayer().getPage(c, getAbsY() + currentDelta);
if (page!=null) {
// calculate max spill from the collapsed top borders of each child
int spill = 0;
for (TableCellBox cell : getTableCells()) {
BorderPropertySet collapsed = cell.getCollapsedPaintingBorder();
if (collapsed != null) {
spill = Math.max(spill, (int)collapsed.top() / 2);
}
}
// be sure that the current start of the row is >= the start of the page
int borderTop = getAbsY() + currentDelta + (int)getMargin(c).top() - spill;
int rowDelta = page.getTop() - borderTop;
if (rowDelta > 0) {
setY(getY() + rowDelta);
currentDelta += rowDelta;
}
}
}
return currentDelta;
}
@Override
protected BlockBox getNextCollapsableSibling(MarginCollapseResult collapsedMargin) {
return null;
}
}