/*
* This file is part of the Scriba source distribution. This is free, open-source
* software. For full licensing information, please see the LicensingInformation file
* at the root level of the distribution.
*
* Copyright (c) 2006-2007 Kobrix Software, Inc.
*/
package seco.notebook.html.view;
/*
* Copyright 1997-2000 Sun Microsystems, Inc. All Rights Reserved.
*
* This software is the proprietary information of Sun Microsystems, Inc.
* Use is subject to license terms.
*
*/
import java.awt.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.text.*;
import javax.swing.text.html.*;
import seco.notebook.html.Util;
import java.util.*;
/**
* HTML table view copied from javax.swing.text.html.TableView.java.
*
* The original intention was to implement a box painter other
* than StyleSheet.BoxPainter which obviously is not complete.
*
* This could have been a simple task just overriding TableView.create
* with our own ViewFactory implementing an alternate BoxPainter.
*
* Unfortunately while create is public, TableView itself is
* not (why???). We have to copy the whole thing and just
* adapt one line to make inner class CellView a subclass of
* our own HTMLBlockView instead of javax.swing.text.html.BlockView.
*
* To make things worse, TableView uses some methods from class CSS which
* are not public as well (again not clear why) so these had to be
* copied into this class too.
*
* All in all a totally ugly solution which hopefully can be corrected
* once Sun decided to tidy up the CSS part of Swing.
*
* @version stage 11, April 27, 2003
*/
public class HTMLTableView extends BoxView implements ViewFactory {
/**
* Constructs a TableView for the given element.
*
* @param elem the element that this view is responsible for
*/
public HTMLTableView(Element elem) {
super(elem, View.Y_AXIS);
rows = new Vector();
gridValid = false;
captionIndex = -1;
totalColumnRequirements = new SizeRequirements();
}
/**
* Creates a new table row.
*
* @param elem an element
* @return the row
*/
protected RowView createTableRow(Element elem) {
// PENDING(prinz) need to add support for some of the other
// elements, but for now just ignore anything that is not
// a TR.
Object o = elem.getAttributes().getAttribute(StyleConstants.NameAttribute);
if (o == HTML.Tag.TR) {
return new RowView(elem);
}
return null;
}
/**
* The number of columns in the table.
*/
public int getColumnCount() {
return columnSpans.length;
}
/**
* Fetches the span (width) of the given column.
* This is used by the nested cells to query the
* sizes of grid locations outside of themselves.
*/
public int getColumnSpan(int col) {
if (col < columnSpans.length) {
return columnSpans[col];
}
return 0;
}
/**
* The number of rows in the table.
*/
public int getRowCount() {
return rows.size();
}
/**
* Fetch the span of multiple rows. This includes
* the border area.
*/
public int getMultiRowSpan(int row0, int row1) {
RowView rv0 = getRow(row0);
RowView rv1 = getRow(row1);
if ((rv0 != null) && (rv1 != null)) {
int index0 = rv0.viewIndex;
int index1 = rv1.viewIndex;
int span = getOffset(Y_AXIS, index1) - getOffset(Y_AXIS, index0) +
getSpan(Y_AXIS, index1);
return span;
}
return 0;
}
/**
* Fetches the span (height) of the given row.
*/
public int getRowSpan(int row) {
RowView rv = getRow(row);
if (rv != null) {
return getSpan(Y_AXIS, rv.viewIndex);
}
return 0;
}
RowView getRow(int row) {
if (row < rows.size()) {
return (RowView) rows.elementAt(row);
}
return null;
}
/**
* Determines the number of columns occupied by
* the table cell represented by given element.
*/
protected int getColumnsOccupied(View v) {
AttributeSet a = v.getElement().getAttributes();
if (a.isDefined(HTML.Attribute.COLSPAN)) {
String s = (String) a.getAttribute(HTML.Attribute.COLSPAN);
if (s != null) {
try {
return Integer.parseInt(s);
} catch (NumberFormatException nfe) {
// fall through to one column
}
}
}
return 1;
}
/**
* Determines the number of rows occupied by
* the table cell represented by given element.
*/
protected int getRowsOccupied(View v) {
AttributeSet a = v.getElement().getAttributes();
if (a.isDefined(HTML.Attribute.ROWSPAN)) {
String s = (String) a.getAttribute(HTML.Attribute.ROWSPAN);
if (s != null) {
try {
return Integer.parseInt(s);
} catch (NumberFormatException nfe) {
// fall through to one row
}
}
}
return 1;
}
protected void invalidateGrid() {
gridValid = false;
}
protected StyleSheet getStyleSheet() {
HTMLDocument doc = (HTMLDocument) getDocument();
return doc.getStyleSheet();
}
/**
* Update the insets, which contain the caption if there
* is a caption.
*/
void updateInsets() {
short top = (short) painter.getInset(TOP, this);
short bottom = (short) painter.getInset(BOTTOM, this);
if (captionIndex != -1) {
View caption = getView(captionIndex);
short h = (short) caption.getPreferredSpan(Y_AXIS);
// AttributeSet a = caption.getAttributes();
/* change in retrieval of CSS.Attribute.CAPTION_SIDE
as this Attribute is not public */
//de.calcom.cclib.html.HTMLDiag hd = new de.calcom.cclib.html.HTMLDiag();
//hd.listAttributes(a, 2);
Object align = null;
//Object align = a.getAttribute(CSS.Attribute.CAPTION_SIDE);
/* change end */
if ((align != null) && (align.equals("bottom"))) {
bottom += h;
} else {
top += h;
}
}
setInsets(top, (short) painter.getInset(LEFT, this),
bottom, (short) painter.getInset(RIGHT, this));
}
/**
* Update any cached values that come from attributes.
*/
protected void setPropertiesFromAttributes() {
StyleSheet sheet = getStyleSheet();
attr = sheet.getViewAttributes(this);
painter = sheet.getBoxPainter(attr);
if (attr != null) {
setInsets((short) painter.getInset(TOP, this),
(short) painter.getInset(LEFT, this),
(short) painter.getInset(BOTTOM, this),
(short) painter.getInset(RIGHT, this));
/*
CSS.LengthValue lv = (CSS.LengthValue)
attr.getAttribute(CSS.Attribute.BORDER_SPACING);
if (lv != null) {
cellSpacing = (int) lv.getValue();
} else {
cellSpacing = 0;
}
*/
}
}
/**
* Fill in the grid locations that are placeholders
* for multi-column, multi-row, and missing grid
* locations.
*/
void updateGrid() {
if (! gridValid) {
relativeCells = false;
multiRowCells = false;
// determine which views are table rows and clear out
// grid points marked filled.
captionIndex = -1;
rows.removeAllElements();
int n = getViewCount();
for (int i = 0; i < n; i++) {
View v = getView(i);
if (v instanceof RowView) {
rows.addElement(v);
RowView rv = (RowView) v;
rv.clearFilledColumns();
rv.rowIndex = rows.size() - 1;
rv.viewIndex = i;
} else {
Object o = v.getElement().getAttributes().getAttribute(StyleConstants.NameAttribute);
if (o instanceof HTML.Tag) {
HTML.Tag kind = (HTML.Tag) o;
if (kind == HTML.Tag.CAPTION) {
captionIndex = i;
}
}
}
}
int maxColumns = 0;
int nrows = rows.size();
for (int row = 0; row < nrows; row++) {
RowView rv = getRow(row);
int col = 0;
for (int cell = 0; cell < rv.getViewCount(); cell++, col++) {
View cv = rv.getView(cell);
if (! relativeCells) {
AttributeSet a = cv.getAttributes();
/*LengthVal lv = (LengthVal)
a.getAttribute(CSS.Attribute.WIDTH);*/
Object lv = a.getAttribute(CSS.Attribute.WIDTH);
if ((lv != null) /*&& (lv.isPercentage())*/) {
if(lv.toString().trim().endsWith("%")) {
relativeCells = true;
}
}
}
// advance to a free column
for (; rv.isFilled(col); col++);
int rowSpan = getRowsOccupied(cv);
if (rowSpan > 1) {
multiRowCells = true;
}
int colSpan = getColumnsOccupied(cv);
if ((colSpan > 1) || (rowSpan > 1)) {
// fill in the overflow entries for this cell
int rowLimit = row + rowSpan;
int colLimit = col + colSpan;
for (int i = row; i < rowLimit; i++) {
for (int j = col; j < colLimit; j++) {
if (i != row || j != col) {
addFill(i, j);
}
}
}
if (colSpan > 1) {
col += colSpan - 1;
}
}
}
maxColumns = Math.max(maxColumns, col);
}
// setup the column layout/requirements
columnSpans = new int[maxColumns];
columnOffsets = new int[maxColumns];
columnRequirements = new SizeRequirements[maxColumns];
for (int i = 0; i < maxColumns; i++) {
columnRequirements[i] = new SizeRequirements();
columnRequirements[i].maximum = Integer.MAX_VALUE;
}
gridValid = true;
}
}
/**
* Mark a grid location as filled in for a cells overflow.
*/
void addFill(int row, int col) {
RowView rv = getRow(row);
if (rv != null) {
rv.fillColumn(col);
}
}
/**
* Layout the columns to fit within the given target span.
*
* @param targetSpan the given span for total of all the table
* columns
* @param reqs the requirements desired for each column. This
* is the column maximum of the cells minimum, preferred, and
* maximum requested span
* @param spans the return value of how much to allocated to
* each column
* @param offsets the return value of the offset from the
* origin for each column
* @return the offset from the origin and the span for each column
* in the offsets and spans parameters
*/
protected void layoutColumns(int targetSpan, int[] offsets, int[] spans,
SizeRequirements[] reqs) {
//System.out.println("layoutColumns offsets=");
colIterator.setLayoutArrays(offsets, spans, targetSpan);
//System.out.println("call to calculateTiledLayout from SHTMLTableView.layoutColumns");
calculateTiledLayout(colIterator, targetSpan);
}
/**
* Calculate the requirements for each column. The calculation
* is done as two passes over the table. The table cells that
* occupy a single column are scanned first to determine the
* maximum of minimum, preferred, and maximum spans along the
* give axis. Table cells that span multiple columns are excluded
* from the first pass. A second pass is made to determine if
* the cells that span multiple columns are satisfied. If the
* column requirements are not satisified, the needs of the
* multi-column cell is mixed into the existing column requirements.
* The calculation of the multi-column distribution is based upon
* the proportions of the existing column requirements and taking
* into consideration any constraining maximums.
*/
void calculateColumnRequirements(int axis) {
// pass 1 - single column cells
boolean hasMultiColumn = false;
int nrows = getRowCount();
for (int i = 0; i < nrows; i++) {
RowView row = getRow(i);
int col = 0;
int ncells = row.getViewCount();
for (int cell = 0; cell < ncells; cell++, col++) {
View cv = row.getView(cell);
for (; row.isFilled(col); col++); // advance to a free column
//int rowSpan = getRowsOccupied(cv);
int colSpan = getColumnsOccupied(cv);
if (colSpan == 1) {
checkSingleColumnCell(axis, col, cv);
} else {
hasMultiColumn = true;
col += colSpan - 1;
}
}
}
// pass 2 - multi-column cells
if (hasMultiColumn) {
for (int i = 0; i < nrows; i++) {
RowView row = getRow(i);
int col = 0;
int ncells = row.getViewCount();
for (int cell = 0; cell < ncells; cell++, col++) {
View cv = row.getView(cell);
for (; row.isFilled(col); col++); // advance to a free column
int colSpan = getColumnsOccupied(cv);
if (colSpan > 1) {
checkMultiColumnCell(axis, col, colSpan, cv);
col += colSpan - 1;
}
}
}
}
}
/**
* check the requirements of a table cell that spans a single column.
*/
void checkSingleColumnCell(int axis, int col, View v) {
SizeRequirements req = columnRequirements[col];
req.minimum = Math.max((int) v.getMinimumSpan(axis), req.minimum);
req.preferred = Math.max((int) v.getPreferredSpan(axis), req.preferred);
}
/**
* check the requirements of a table cell that spans multiple
* columns.
*/
void checkMultiColumnCell(int axis, int col, int ncols, View v) {
// calculate the totals
long min = 0;
long pref = 0;
long max = 0;
for (int i = 0; i < ncols; i++) {
SizeRequirements req = columnRequirements[col + i];
min += req.minimum;
pref += req.preferred;
max += req.maximum;
}
// check if the minimum size needs adjustment.
int cmin = (int) v.getMinimumSpan(axis);
if (cmin > min) {
/*
* the columns that this cell spans need adjustment to fit
* this table cell.... calculate the adjustments.
*/
SizeRequirements[] reqs = new SizeRequirements[ncols];
for (int i = 0; i < ncols; i++) {
reqs[i] = columnRequirements[col + i];
}
int[] spans = new int[ncols];
int[] offsets = new int[ncols];
SizeRequirements.calculateTiledPositions(cmin, null, reqs,
offsets, spans);
// apply the adjustments
for (int i = 0; i < ncols; i++) {
SizeRequirements req = reqs[i];
req.minimum = Math.max(spans[i], req.minimum);
req.preferred = Math.max(req.minimum, req.preferred);
req.maximum = Math.max(req.preferred, req.maximum);
}
}
// check if the preferred size needs adjustment.
int cpref = (int) v.getPreferredSpan(axis);
if (cpref > pref) {
/*
* the columns that this cell spans need adjustment to fit
* this table cell.... calculate the adjustments.
*/
SizeRequirements[] reqs = new SizeRequirements[ncols];
for (int i = 0; i < ncols; i++) {
reqs[i] = columnRequirements[col + i];
}
int[] spans = new int[ncols];
int[] offsets = new int[ncols];
SizeRequirements.calculateTiledPositions(cpref, null, reqs,
offsets, spans);
// apply the adjustments
for (int i = 0; i < ncols; i++) {
SizeRequirements req = reqs[i];
req.preferred = Math.max(spans[i], req.preferred);
req.maximum = Math.max(req.preferred, req.maximum);
}
}
}
// --- BoxView methods -----------------------------------------
/**
* Calculate the requirements for the minor axis. This is called by
* the superclass whenever the requirements need to be updated (i.e.
* a preferenceChanged was messaged through this view).
* <p>
* This is implemented to calculate the requirements as the sum of the
* requirements of the columns and then adjust it if the
* CSS width or height attribute is specified and applicable to
* the axis.
*/
protected SizeRequirements calculateMinorAxisRequirements(int axis, SizeRequirements r) {
updateGrid();
// calculate column requirements for each column
calculateColumnRequirements(axis);
// the requirements are the sum of the columns.
if (r == null) {
r = new SizeRequirements();
}
long min = 0;
long pref = 0;
int n = columnRequirements.length;
for (int i = 0; i < n; i++) {
SizeRequirements req = columnRequirements[i];
min += req.minimum;
pref += req.preferred;
}
int adjust = (n - 1) * cellSpacing;
min += adjust;
pref += adjust;
r.minimum = (int) min;
r.preferred = (int) pref;
r.maximum = (int) pref;
AttributeSet attr = getAttributes();
/*LengthVal cssWidth = (LengthVal)attr.getAttribute(
CSS.Attribute.WIDTH);*/
Object cssWidth = attr.getAttribute(CSS.Attribute.WIDTH);
if (HTMLBlockView.spanSetFromAttributes(axis, r, cssWidth, null)) {
if (r.minimum < (int)min) {
// The user has requested a smaller size than is needed to
// show the table, override it.
r.maximum = r.minimum = r.preferred = (int) min;
}
}
totalColumnRequirements.minimum = r.minimum;
totalColumnRequirements.preferred = r.preferred;
totalColumnRequirements.maximum = r.maximum;
// set the alignment
Object o = attr.getAttribute(CSS.Attribute.TEXT_ALIGN);
if (o != null) {
// set horizontal alignment
String ta = o.toString();
if (ta.equals("left")) {
r.alignment = 0;
} else if (ta.equals("center")) {
r.alignment = 0.5f;
} else if (ta.equals("right")) {
r.alignment = 1;
} else {
r.alignment = 0;
}
} else {
r.alignment = 0;
}
return r;
}
/**
* Calculate the requirements for the major axis. This is called by
* the superclass whenever the requirements need to be updated (i.e.
* a preferenceChanged was messaged through this view).
* <p>
* This is implemented to provide the superclass behavior adjusted for
* multi-row table cells.
*/
protected SizeRequirements calculateMajorAxisRequirements(int axis, SizeRequirements r) {
updateInsets();
rowIterator.updateAdjustments();
//System.out.println("call to calculateTiledRequirements from SHTMLTableView.calculateMajorAxisRequirements");
r = calculateTiledRequirements(rowIterator, r);
r.maximum = r.preferred;
return r;
}
/**
* Perform layout for the minor axis of the box (i.e. the
* axis orthoginal to the axis that it represents). The results
* of the layout should be placed in the given arrays which represent
* the allocations to the children along the minor axis. This
* is called by the superclass whenever the layout needs to be
* updated along the minor axis.
* <p>
* This is implemented to call the
* <a href="#layoutColumns">layoutColumns</a> method, and then
* forward to the superclass to actually carry out the layout
* of the tables rows.
*
* @param targetSpan the total span given to the view, which
* whould be used to layout the children
* @param axis the axis being layed out
* @param offsets the offsets from the origin of the view for
* each of the child views. This is a return value and is
* filled in by the implementation of this method
* @param spans the span of each child view; this is a return
* value and is filled in by the implementation of this method
* @return the offset and span for each child view in the
* offsets and spans parameters
*/
protected void layoutMinorAxis(int targetSpan, int axis, int[] offsets, int[] spans) {
// make grid is properly represented
updateGrid();
// all of the row layouts are invalid, so mark them that way
int n = getRowCount();
for (int i = 0; i < n; i++) {
RowView row = getRow(i);
row.layoutChanged(axis);
}
// calculate column spans
layoutColumns(targetSpan, columnOffsets, columnSpans, columnRequirements);
// continue normal layout
super.layoutMinorAxis(targetSpan, axis, offsets, spans);
}
/**
* Perform layout for the major axis of the box (i.e. the
* axis that it represents). The results
* of the layout should be placed in the given arrays which represent
* the allocations to the children along the minor axis. This
* is called by the superclass whenever the layout needs to be
* updated along the minor axis.
* <p>
* This method is where the layout of the table rows within the
* table takes place. This method is implemented to call the use
* the RowIterator and the CSS collapsing tile to layout
* with border spacing and border collapsing capabilities.
*
* @param targetSpan the total span given to the view, which
* whould be used to layout the children
* @param axis the axis being layed out
* @param offsets the offsets from the origin of the view for
* each of the child views; this is a return value and is
* filled in by the implementation of this method
* @param spans the span of each child view; this is a return
* value and is filled in by the implementation of this method
* @return the offset and span for each child view in the
* offsets and spans parameters
*/
protected void layoutMajorAxis(int targetSpan, int axis, int[] offsets, int[] spans) {
rowIterator.setLayoutArrays(offsets, spans);
//System.out.println("call to calculateTiledLayout from SHTMLTableView.layoutMajorAxis");
calculateTiledLayout(rowIterator, targetSpan);
if (captionIndex != -1) {
// place the caption
View caption = getView(captionIndex);
int h = (int) caption.getPreferredSpan(Y_AXIS);
spans[captionIndex] = h;
short boxBottom = (short) painter.getInset(BOTTOM, this);
if (boxBottom != getBottomInset()) {
offsets[captionIndex] = targetSpan + boxBottom;
} else {
offsets[captionIndex] = - getTopInset();
}
}
}
/**
* Fetches the child view that represents the given position in
* the model. This is implemented to walk through the children
* looking for a range that contains the given position. In this
* view the children do not necessarily have a one to one mapping
* with the child elements.
*
* @param pos the search position >= 0
* @param a the allocation to the table on entry, and the
* allocation of the view containing the position on exit
* @return the view representing the given position, or
* null if there isn't one
*/
protected View getViewAtPosition(int pos, Rectangle a) {
int n = getViewCount();
for (int i = 0; i < n; i++) {
View v = getView(i);
int p0 = v.getStartOffset();
int p1 = v.getEndOffset();
if ((pos >= p0) && (pos < p1)) {
// it's in this view.
if (a != null) {
childAllocation(i, a);
}
return v;
}
}
if (pos == getEndOffset()) {
View v = getView(n - 1);
if (a != null) {
this.childAllocation(n - 1, a);
}
return v;
}
return null;
}
// --- View methods ---------------------------------------------
/**
* Fetches the attributes to use when rendering. This is
* implemented to multiplex the attributes specified in the
* model with a StyleSheet.
*/
public AttributeSet getAttributes() {
if (attr == null) {
StyleSheet sheet = getStyleSheet();
attr = sheet.getViewAttributes(this);
}
return attr;
}
/**
* Renders using the given rendering surface and area on that
* surface. This is implemented to delegate to the css box
* painter to paint the border and background prior to the
* interior. The superclass culls rendering the children
* that don't directly intersect the clip and the row may
* have cells hanging from a row above in it. The table
* does not use the superclass rendering behavior and instead
* paints all of the rows and lets the rows cull those
* cells not intersecting the clip region.
*
* @param g the rendering surface to use
* @param allocation the allocated region to render into
* @see View#paint
*/
public void paint(Graphics g, Shape allocation) {
// paint the border
Rectangle a = allocation.getBounds();
setSize(a.width, a.height);
if (captionIndex != -1) {
// adjust the border for the caption
short top = (short) painter.getInset(TOP, this);
short bottom = (short) painter.getInset(BOTTOM, this);
if (top != getTopInset()) {
int h = getTopInset() - top;
a.y += h;
a.height -= h;
} else {
a.height -= getBottomInset() - bottom;
}
}
//System.out.println("SHTMLTableView paint a.x=" + a.x + " a.y=" + a.y + "a.width=" + a.width + " a.height=" + a.height);
painter.paint(g, a.x, a.y, a.width, a.height, this);
// paint interior
int n = getViewCount();
for (int i = 0; i < n; i++) {
View v = getView(i);
v.paint(g, getChildAllocation(i, allocation));
}
//super.paint(g, a);
}
/**
* Establishes the parent view for this view. This is
* guaranteed to be called before any other methods if the
* parent view is functioning properly.
* <p>
* This is implemented
* to forward to the superclass as well as call the
* <a href="#setPropertiesFromAttributes">setPropertiesFromAttributes</a>
* method to set the paragraph properties from the css
* attributes. The call is made at this time to ensure
* the ability to resolve upward through the parents
* view attributes.
*
* @param parent the new parent, or null if the view is
* being removed from a parent it was previously added
* to
*/
public void setParent(View parent) {
super.setParent(parent);
if (parent != null) {
setPropertiesFromAttributes();
}
}
/**
* Fetches the ViewFactory implementation that is feeding
* the view hierarchy.
* This replaces the ViewFactory with an implementation that
* calls through to the createTableRow and createTableCell
* methods. If the element given to the factory isn't a
* table row or cell, the request is delegated to the factory
* produced by the superclass behavior.
*
* @return the factory, null if none
*/
public ViewFactory getViewFactory() {
return this;
}
/**
* Gives notification that something was inserted into
* the document in a location that this view is responsible for.
* This replaces the ViewFactory with an implementation that
* calls through to the createTableRow and createTableCell
* methods. If the element given to the factory isn't a
* table row or cell, the request is delegated to the factory
* passed as an argument.
*
* @param e the change information from the associated document
* @param a the current allocation of the view
* @param f the factory to use to rebuild if the view has children
* @see View#insertUpdate
*/
public void insertUpdate(DocumentEvent e, Shape a, ViewFactory f) {
super.insertUpdate(e, a, this);
}
/**
* Gives notification that something was removed from the document
* in a location that this view is responsible for.
* This replaces the ViewFactory with an implementation that
* calls through to the createTableRow and createTableCell
* methods. If the element given to the factory isn't a
* table row or cell, the request is delegated to the factory
* passed as an argument.
*
* @param e the change information from the associated document
* @param a the current allocation of the view
* @param f the factory to use to rebuild if the view has children
* @see View#removeUpdate
*/
public void removeUpdate(DocumentEvent e, Shape a, ViewFactory f) {
super.removeUpdate(e, a, this);
}
/**
* Gives notification from the document that attributes were changed
* in a location that this view is responsible for.
* This replaces the ViewFactory with an implementation that
* calls through to the createTableRow and createTableCell
* methods. If the element given to the factory isn't a
* table row or cell, the request is delegated to the factory
* passed as an argument.
*
* @param e the change information from the associated document
* @param a the current allocation of the view
* @param f the factory to use to rebuild if the view has children
* @see View#changedUpdate
*/
public void changedUpdate(DocumentEvent e, Shape a, ViewFactory f) {
attr = getStyleSheet().getViewAttributes(this);
//System.out.println("HTMLTableView changedUpdate" +
// attr.getAttribute(CSS.Attribute.WIDTH));
super.changedUpdate(e, a, this);
}
protected void forwardUpdate(DocumentEvent.ElementChange ec,
DocumentEvent e, Shape a, ViewFactory f) {
super.forwardUpdate(ec, e, a, f);
// A change in any of the table cells usually effects the whole table,
// so redraw it all!
if (a != null) {
Component c = getContainer();
if (c != null) {
Rectangle alloc = (a instanceof Rectangle) ? (Rectangle)a :
a.getBounds();
c.repaint(alloc.x, alloc.y, alloc.width, alloc.height);
}
}
}
/**
* Change the child views. This is implemented to
* provide the superclass behavior and invalidate the
* grid so that rows and columns will be recalculated.
*/
public void replace(int offset, int length, View[] views) {
super.replace(offset, length, views);
invalidateGrid();
}
// --- ViewFactory methods ------------------------------------------
/**
* The table itself acts as a factory for the various
* views that actually represent pieces of the table.
* All other factory activity is delegated to the factory
* returned by the parent of the table.
*/
public View create(Element elem) {
Object o = elem.getAttributes().getAttribute(StyleConstants.NameAttribute);
if (o instanceof HTML.Tag) {
HTML.Tag kind = (HTML.Tag) o;
if (kind == HTML.Tag.TR) {
return createTableRow(elem);
} else if ((kind == HTML.Tag.TD) || (kind == HTML.Tag.TH)) {
return new CellView(elem);
} else if (kind == HTML.Tag.CAPTION) {
return new javax.swing.text.html.ParagraphView(elem);
}
}
// default is to delegate to the normal factory
View p = getParent();
if (p != null) {
ViewFactory f = p.getViewFactory();
if (f != null) {
return f.create(elem);
}
}
return null;
}
// ---- variables ----------------------------------------------------
private AttributeSet attr;
private StyleSheet.BoxPainter painter;
private int cellSpacing;
/**
* The index of the caption view if there is a caption.
* This has a value of -1 if there is no caption. The
* caption lives in the inset area of the table, and is
* updated with each time the grid is recalculated.
*/
private int captionIndex;
/**
* Do any of the table cells contain a relative size
* specification? This is updated with each call to
* updateGrid(). If this is true, the ColumnIterator
* will do extra work to calculate relative cell
* specifications.
*/
private boolean relativeCells;
/**
* Do any of the table cells span multiple rows? If
* true, the RowRequirementIterator will do additional
* work to adjust the requirements of rows spanned by
* a single table cell. This is updated with each call to
* updateGrid().
*/
private boolean multiRowCells;
int[] columnSpans;
int[] columnOffsets;
/**
* SizeRequirements for all the columns.
*/
SizeRequirements totalColumnRequirements;
SizeRequirements[] columnRequirements;
RowIterator rowIterator = new RowIterator();
ColumnIterator colIterator = new ColumnIterator();
Vector rows;
boolean gridValid;
static final private BitSet EMPTY = new BitSet();
class ColumnIterator implements LayoutIterator {
/**
* Disable percentage adjustments which should only apply
* when calculating layout, not requirements.
*/
void disablePercentages() {
percentages = null;
}
/**
* Set the layout arrays to use for holding layout results
*/
public void setLayoutArrays(int offsets[], int spans[], int targetSpan) {
this.offsets = offsets;
this.spans = spans;
updatePercentagesAndAdjustmentWeights(targetSpan);
//updatePercentages(targetSpan);
}
private void updatePercentagesAndAdjustmentWeights(int span) {
adjustmentWeights = new int[columnRequirements.length];
for (int i = 0; i < columnRequirements.length; i++) {
adjustmentWeights[i] = 0;
}
if (relativeCells) {
percentages = new int[columnRequirements.length];
} else {
percentages = null;
}
int nrows = getRowCount();
for (int rowIndex = 0; rowIndex < nrows; rowIndex++) {
RowView row = getRow(rowIndex);
int col = 0;
int ncells = row.getViewCount();
for (int cell = 0; cell < ncells; cell++, col++) {
View cv = row.getView(cell);
for (; row.isFilled(col); col++); // advance to a free column
//int rowSpan = getRowsOccupied(cv);
int colSpan = getColumnsOccupied(cv);
AttributeSet a = cv.getAttributes();
Object lv = a.getAttribute(CSS.Attribute.WIDTH);
if ( lv != null ) {
int len = (int) ((Util.getPtValue(lv.toString()) *
new Integer(span).floatValue())
/ new Integer(colSpan).floatValue() + 0.5f);
if(lv.toString().trim().endsWith("%")) {
for (int i = 0; i < colSpan; i++) {
// add a percentage requirement
percentages[col+i] = Math.max(percentages[col+i], len);
adjustmentWeights[col+i] = WorstAdjustmentWeight;
} //else {
//adjustmentWeights[col+i] = WorstAdjustmentWeight - 1;
// }
}
}
col += colSpan - 1;
}
}
}
// --- RequirementIterator methods -------------------
public int getCount() {
return columnRequirements.length;
}
public void setIndex(int i) {
col = i;
}
public void setOffset(int offs) {
offsets[col] = offs;
}
public int getOffset() {
return offsets[col];
}
public void setSpan(int span) {
spans[col] = span;
}
public int getSpan() {
return spans[col];
}
public float getMinimumSpan(float parentSpan) {
if ((percentages != null) && (percentages[col] != 0)) {
return Math.max(percentages[col], columnRequirements[col].minimum);
}
return columnRequirements[col].minimum;
}
public float getPreferredSpan(float parentSpan) {
if ((percentages != null) && (percentages[col] != 0)) {
return Math.max(percentages[col], columnRequirements[col].preferred);
}
return columnRequirements[col].preferred;
}
public float getMaximumSpan(float parentSpan) {
if ((percentages != null) && (percentages[col] != 0)) {
return Math.max(percentages[col], columnRequirements[col].preferred);
}
return columnRequirements[col].maximum;
}
public float getLeadingCollapseSpan() {
return cellSpacing;
}
public float getTrailingCollapseSpan() {
return cellSpacing;
}
public int getAdjustmentWeight() {
return adjustmentWeights[col];
}
private int borderWidth = 0;
public float getBorderWidth() {
return borderWidth;
}
private int[] adjustmentWeights;
/**
* Current column index
*/
private int col;
/**
* percentage values (may be null since there
* might not be any).
*/
private int[] percentages;
private int[] offsets;
private int[] spans;
}
class RowIterator implements LayoutIterator {
RowIterator() {
}
void updateAdjustments() {
int axis = Y_AXIS;
if (multiRowCells) {
// adjust requirements of multi-row cells
int n = getRowCount();
adjustments = new int[n];
for (int i = 0; i < n; i++) {
RowView rv = getRow(i);
if (rv.multiRowCells == true) {
int ncells = rv.getViewCount();
for (int j = 0; j < ncells; j++) {
View v = rv.getView(j);
int nrows = getRowsOccupied(v);
if (nrows > 1) {
int spanNeeded = (int) v.getPreferredSpan(axis);
adjustMultiRowSpan(spanNeeded, nrows, i);
}
}
}
}
} else {
adjustments = null;
}
}
private int borderWidth = 0;
public float getBorderWidth() {
return borderWidth;
}
public int getAdjustmentWeight() {
return 0;
}
/**
* Fixup preferences to accomodate a multi-row table cell
* if not already covered by existing preferences. This is
* a no-op if not all of the rows needed (to do this check/fixup)
* have arrived yet.
*/
void adjustMultiRowSpan(int spanNeeded, int nrows, int rowIndex) {
if ((rowIndex + nrows) > getCount()) {
// rows are missing (could be a bad rowspan specification)
// or not all the rows have arrived. Do the best we can with
// the current set of rows.
nrows = getCount() - rowIndex;
if (nrows < 1) {
return;
}
}
int span = 0;
for (int i = 0; i < nrows; i++) {
RowView rv = getRow(rowIndex + i);
span += rv.getPreferredSpan(Y_AXIS);
}
if (spanNeeded > span) {
int adjust = (spanNeeded - span);
int rowAdjust = adjust / nrows;
int firstAdjust = rowAdjust + (adjust - (rowAdjust * nrows));
//RowView rv = getRow(rowIndex);
adjustments[rowIndex] = Math.max(adjustments[rowIndex],
firstAdjust);
for (int i = 1; i < nrows; i++) {
adjustments[rowIndex + i] = Math.max(
adjustments[rowIndex + i], rowAdjust);
}
}
}
void setLayoutArrays(int[] offsets, int[] spans) {
this.offsets = offsets;
this.spans = spans;
}
// --- RequirementIterator methods -------------------
public void setOffset(int offs) {
RowView rv = getRow(row);
if (rv != null) {
offsets[rv.viewIndex] = offs;
}
}
public int getOffset() {
RowView rv = getRow(row);
if (rv != null) {
return offsets[rv.viewIndex];
}
return 0;
}
public void setSpan(int span) {
RowView rv = getRow(row);
if (rv != null) {
spans[rv.viewIndex] = span;
}
}
public int getSpan() {
RowView rv = getRow(row);
if (rv != null) {
return spans[rv.viewIndex];
}
return 0;
}
public int getCount() {
return rows.size();
}
public void setIndex(int i) {
row = i;
}
public float getMinimumSpan(float parentSpan) {
return getPreferredSpan(parentSpan);
}
public float getPreferredSpan(float parentSpan) {
RowView rv = getRow(row);
if (rv != null) {
int adjust = (adjustments != null) ? adjustments[row] : 0;
adjust += 2 * cellSpacing;
return rv.getPreferredSpan(HTMLTableView.this.getAxis()) + adjust;
}
return 0;
}
public float getMaximumSpan(float parentSpan) {
return getPreferredSpan(parentSpan);
}
public float getLeadingCollapseSpan() {
return cellSpacing;
}
public float getTrailingCollapseSpan() {
return cellSpacing;
}
/**
* Current row index
*/
private int row;
/**
* Adjustments to the row requirements to handle multi-row
* table cells.
*/
private int[] adjustments;
private int[] offsets;
private int[] spans;
}
/**
* View of a row in a row-centric table.
*/
public class RowView extends BoxView {
/**
* Constructs a TableView for the given element.
*
* @param elem the element that this view is responsible for
*/
public RowView(Element elem) {
super(elem, View.X_AXIS);
fillColumns = new BitSet();
RowView.this.setPropertiesFromAttributes();
}
void clearFilledColumns() {
fillColumns.and(EMPTY);
}
void fillColumn(int col) {
fillColumns.set(col);
}
boolean isFilled(int col) {
return fillColumns.get(col);
}
/**
* The number of columns present in this row.
*/
int getColumnCount() {
int nfill = 0;
int n = fillColumns.size();
for (int i = 0; i < n; i++) {
if (fillColumns.get(i)) {
nfill ++;
}
}
return getViewCount() + nfill;
}
/**
* Fetches the attributes to use when rendering. This is
* implemented to multiplex the attributes specified in the
* model with a StyleSheet.
*/
public AttributeSet getAttributes() {
return attr;
}
protected StyleSheet getStyleSheet() {
HTMLDocument doc = (HTMLDocument) getDocument();
return doc.getStyleSheet();
}
/**
* This is called by a child to indicate its
* preferred span has changed. This is implemented to
* execute the superclass behavior and well as try to
* determine if a row with a multi-row cell hangs across
* this row. If a multi-row cell covers this row it also
* needs to propagate a preferenceChanged so that it will
* recalculate the multi-row cell.
*
* @param child the child view
* @param width true if the width preference should change
* @param height true if the height preference should change
*/
public void preferenceChanged(View child, boolean width, boolean height) {
super.preferenceChanged(child, width, height);
if (HTMLTableView.this.multiRowCells && height) {
for (int i = rowIndex - 1; i >= 0; i--) {
RowView rv = HTMLTableView.this.getRow(i);
if (rv.multiRowCells) {
rv.preferenceChanged(null, false, true);
break;
}
}
}
}
// The major axis requirements for a row are dictated by the column
// requirements. These methods use the value calculated by
// TableView.
protected SizeRequirements calculateMajorAxisRequirements(int axis, SizeRequirements r) {
SizeRequirements req = new SizeRequirements();
req.minimum = totalColumnRequirements.minimum;
req.maximum = totalColumnRequirements.maximum;
req.preferred = totalColumnRequirements.preferred;
req.alignment = 0f;
return req;
}
public float getMinimumSpan(int axis) {
float value;
if (axis == View.X_AXIS) {
value = totalColumnRequirements.minimum + getLeftInset() +
getRightInset();
}
else {
value = super.getMinimumSpan(axis);
}
return value;
}
public float getMaximumSpan(int axis) {
float value;
if (axis == View.X_AXIS) {
// We're flexible.
value = (float)Integer.MAX_VALUE;
}
else {
value = super.getMaximumSpan(axis);
}
return value;
}
public float getPreferredSpan(int axis) {
float value;
if (axis == View.X_AXIS) {
value = totalColumnRequirements.preferred + getLeftInset() +
getRightInset();
}
else {
value = super.getPreferredSpan(axis);
}
return value;
}
public void changedUpdate(DocumentEvent e, Shape a, ViewFactory f) {
super.changedUpdate(e, a, f);
int pos = e.getOffset();
if (pos <= getStartOffset() && (pos + e.getLength()) >=
getEndOffset()) {
RowView.this.setPropertiesFromAttributes();
}
}
/**
* Renders using the given rendering surface and area on that
* surface. This is implemented to delegate to the css box
* painter to paint the border and background prior to the
* interior.
*
* @param g the rendering surface to use
* @param allocation the allocated region to render into
* @see View#paint
*/
public void paint(Graphics g, Shape allocation) {
Rectangle a = (Rectangle) allocation;
painter.paint(g, a.x, a.y, a.width, a.height, this);
super.paint(g, a);
}
/**
* Change the child views. This is implemented to
* provide the superclass behavior and invalidate the
* grid so that rows and columns will be recalculated.
*/
public void replace(int offset, int length, View[] views) {
super.replace(offset, length, views);
invalidateGrid();
}
/**
* Calculate the height requirements of the table row. The
* requirements of multi-row cells are not considered for this
* calculation. The table itself will check and adjust the row
* requirements for all the rows that have multi-row cells spanning
* them. This method updates the multi-row flag that indicates that
* this row and rows below need additional consideration.
*/
protected SizeRequirements calculateMinorAxisRequirements(int axis, SizeRequirements r) {
// return super.calculateMinorAxisRequirements(axis, r);
long min = 0;
long pref = 0;
long max = 0;
multiRowCells = false;
int n = getViewCount();
for (int i = 0; i < n; i++) {
View v = getView(i);
if (getRowsOccupied(v) > 1) {
multiRowCells = true;
max = Math.max((int) v.getMaximumSpan(axis), max);
} else {
min = Math.max((int) v.getMinimumSpan(axis), min);
pref = Math.max((int) v.getPreferredSpan(axis), pref);
max = Math.max((int) v.getMaximumSpan(axis), max);
}
}
if (r == null) {
r = new SizeRequirements();
r.alignment = 0.5f;
}
r.preferred = (int) pref;
r.minimum = (int) min;
r.maximum = (int) max;
return r;
}
/**
* Perform layout for the major axis of the box (i.e. the
* axis that it represents). The results of the layout should
* be placed in the given arrays which represent the allocations
* to the children along the major axis.
* <p>
* This is re-implemented to give each child the span of the column
* width for the table, and to give cells that span multiple columns
* the multi-column span.
*
* @param targetSpan the total span given to the view, which
* whould be used to layout the children
* @param axis the axis being layed out
* @param offsets the offsets from the origin of the view for
* each of the child views; this is a return value and is
* filled in by the implementation of this method
* @param spans the span of each child view; this is a return
* value and is filled in by the implementation of this method
* @return the offset and span for each child view in the
* offsets and spans parameters
*/
protected void layoutMajorAxis(int targetSpan, int axis, int[] offsets, int[] spans) {
int col = 0;
int ncells = getViewCount();
for (int cell = 0; cell < ncells; cell++, col++) {
View cv = getView(cell);
for (; isFilled(col); col++); // advance to a free column
int colSpan = getColumnsOccupied(cv);
spans[cell] = columnSpans[col];
offsets[cell] = columnOffsets[col];
if (colSpan > 1) {
int n = columnSpans.length;
for (int j = 1; j < colSpan; j++) {
// Because the table may be only partially formed, some
// of the columns may not yet exist. Therefore we check
// the bounds.
if ((col+j) < n) {
spans[cell] += columnSpans[col+j];
}
}
col += colSpan - 1;
}
}
}
/**
* Perform layout for the minor axis of the box (i.e. the
* axis orthoginal to the axis that it represents). The results
* of the layout should be placed in the given arrays which represent
* the allocations to the children along the minor axis. This
* is called by the superclass whenever the layout needs to be
* updated along the minor axis.
* <p>
* This is implemented to delegate to the superclass, then adjust
* the span for any cell that spans multiple rows.
*
* @param targetSpan the total span given to the view, which
* whould be used to layout the children
* @param axis the axis being layed out
* @param offsets the offsets from the origin of the view for
* each of the child views; this is a return value and is
* filled in by the implementation of this method
* @param spans the span of each child view; this is a return
* value and is filled in by the implementation of this method
* @return the offset and span for each child view in the
* offsets and spans parameters
*/
protected void layoutMinorAxis(int targetSpan, int axis, int[] offsets, int[] spans) {
super.layoutMinorAxis(targetSpan, axis, offsets, spans);
int col = 0;
int ncells = getViewCount();
for (int cell = 0; cell < ncells; cell++, col++) {
View cv = getView(cell);
for (; isFilled(col); col++); // advance to a free column
int colSpan = getColumnsOccupied(cv);
int rowSpan = getRowsOccupied(cv);
if (rowSpan > 1) {
int row0 = rowIndex;
int row1 = Math.min(rowIndex + rowSpan - 1, getRowCount()-1);
spans[cell] = getMultiRowSpan(row0, row1);
}
if (colSpan > 1) {
col += colSpan - 1;
}
}
}
/**
* Determines the resizability of the view along the
* given axis. A value of 0 or less is not resizable.
*
* @param axis may be either View.X_AXIS or View.Y_AXIS
* @return the resize weight
* @exception IllegalArgumentException for an invalid axis
*/
public int getResizeWeight(int axis) {
return 1;
}
/**
* Fetches the child view that represents the given position in
* the model. This is implemented to walk through the children
* looking for a range that contains the given position. In this
* view the children do not necessarily have a one to one mapping
* with the child elements.
*
* @param pos the search position >= 0
* @param a the allocation to the table on entry, and the
* allocation of the view containing the position on exit
* @return the view representing the given position, or
* null if there isn't one
*/
protected View getViewAtPosition(int pos, Rectangle a) {
int n = getViewCount();
for (int i = 0; i < n; i++) {
View v = getView(i);
int p0 = v.getStartOffset();
int p1 = v.getEndOffset();
if ((pos >= p0) && (pos < p1)) {
// it's in this view.
if (a != null) {
childAllocation(i, a);
}
return v;
}
}
if (pos == getEndOffset()) {
View v = getView(n - 1);
if (a != null) {
this.childAllocation(n - 1, a);
}
return v;
}
return null;
}
/**
* Update any cached values that come from attributes.
*/
void setPropertiesFromAttributes() {
StyleSheet sheet = getStyleSheet();
attr = sheet.getViewAttributes(this);
painter = sheet.getBoxPainter(attr);
}
private StyleSheet.BoxPainter painter;
private AttributeSet attr;
/** columns filled by multi-column or multi-row cells */
BitSet fillColumns;
/**
* The row index within the overall grid
*/
int rowIndex;
/**
* The view index (for row index to view index conversion).
* This is set by the updateGrid method.
*/
int viewIndex;
/**
* Does this table row have cells that span multiple rows?
*/
boolean multiRowCells;
}
/**
* Default view of an html table cell. This needs to be moved
* somewhere else.
*/
class CellView extends HTMLBlockView {
/**
* Constructs a TableCell for the given element.
*
* @param elem the element that this view is responsible for
*/
public CellView(Element elem) {
super(elem, Y_AXIS);
}
/*
public void paint(Graphics g, Shape allocation) {
Rectangle a = allocation.getBounds();
//System.out.println("SHTMLTableView.CellView paint a.x=" + a.x + " a.y=" + a.y + "a.width=" + a.width + " a.height=" + a.height);
super.paint(g, allocation);
}
*/
/**
* Perform layout for the major axis of the box (i.e. the
* axis that it represents). The results of the layout should
* be placed in the given arrays which represent the allocations
* to the children along the major axis. This is called by the
* superclass to recalculate the positions of the child views
* when the layout might have changed.
* <p>
* This is implemented to delegate to the superclass to
* tile the children. If the target span is greater than
* was needed, the offsets are adjusted to align the children
* (i.e. position according to the html valign attribute).
*
* @param targetSpan the total span given to the view, which
* whould be used to layout the children
* @param axis the axis being layed out
* @param offsets the offsets from the origin of the view for
* each of the child views; this is a return value and is
* filled in by the implementation of this method
* @param spans the span of each child view; this is a return
* value and is filled in by the implementation of this method
* @return the offset and span for each child view in the
* offsets and spans parameters
*/
protected void layoutMajorAxis(int targetSpan, int axis, int[] offsets, int[] spans) {
super.layoutMajorAxis(targetSpan, axis, offsets, spans);
// calculate usage
int used = 0;
int n = spans.length;
for (int i = 0; i < n; i++) {
used += spans[i];
}
// calculate adjustments
int adjust = 0;
if (used < targetSpan) {
// PENDING(prinz) change to use the css alignment.
String valign = (String) getElement().getAttributes().getAttribute(
HTML.Attribute.VALIGN);
if (valign == null) {
AttributeSet rowAttr = getElement().getParentElement().getAttributes();
valign = (String) rowAttr.getAttribute(HTML.Attribute.VALIGN);
}
if ((valign == null) || valign.equals("middle")) {
adjust = (targetSpan - used) / 2;
} else if (valign.equals("bottom")) {
adjust = targetSpan - used;
}
}
// make adjustments.
if (adjust != 0) {
for (int i = 0; i < n; i++) {
offsets[i] += adjust;
}
}
}
/**
* Calculate the requirements needed along the major axis.
* This is called by the superclass whenever the requirements
* need to be updated (i.e. a preferenceChanged was messaged
* through this view).
* <p>
* This is implemented to delegate to the superclass, but
* indicate the maximum size is very large (i.e. the cell
* is willing to expend to occupy the full height of the row).
*
* @param axis the axis being layed out.
* @param r the requirements to fill in. If null, a new one
* should be allocated.
*/
protected SizeRequirements calculateMajorAxisRequirements(int axis,
SizeRequirements r) {
SizeRequirements req = super.calculateMajorAxisRequirements(axis, r);
req.maximum = Integer.MAX_VALUE;
return req;
}
}
/* ------------------------------------------------------
start additional items from javax.swing.text.html.CSS
------------------------------------------------------ */
/**
* An iterator to express the requirements to use when computing
* layout.
*
* (copied from javax.swing.text.html.CSS)
*/
interface LayoutIterator {
public static final int WorstAdjustmentWeight = 2;
void setOffset(int offs);
int getOffset();
void setSpan(int span);
int getSpan();
int getCount();
void setIndex(int i);
float getMinimumSpan(float parentSpan);
float getPreferredSpan(float parentSpan);
float getMaximumSpan(float parentSpan);
//float getAlignment();
float getLeadingCollapseSpan();
float getTrailingCollapseSpan();
int getAdjustmentWeight();
float getBorderWidth();
}
/**
* Calculate a tiled layout for the given iterator.
* This should be done collapsing the neighboring
* margins to be a total of the maximum of the two
* neighboring margin areas as described in the CSS spec.
*
* (copied from javax.swing.text.html.CSS)
*/
static void calculateTiledLayout0(LayoutIterator iter, int targetSpan) {
/*
* first pass, calculate the preferred sizes, adjustments needed because
* of margin collapsing, and the flexibility to adjust the sizes.
*/
long minimum = 0;
long maximum = 0;
long preferred = 0;
int lastMargin = 0;
int collapsed = 0;
int n = iter.getCount();
for (int i = 0; i < n; i++) {
iter.setIndex(i);
int margin0 = lastMargin;
//int margin1 = (int) iter.getLeadingCollapseSpan();
//iter.setOffset(Math.max(margin0, margin1));
iter.setOffset((int) preferred); // don't know, why, but it works
if (iter.getOffset() != 0) {
// There is a collapse area
iter.setOffset(iter.getOffset() - margin0);
collapsed += iter.getOffset();
}
iter.setSpan( (int) iter.getPreferredSpan(targetSpan));
preferred += iter.getSpan();
minimum += iter.getMinimumSpan(targetSpan);
maximum += iter.getMaximumSpan(targetSpan);
lastMargin = (int) iter.getTrailingCollapseSpan();
}
}
static void calculateTiledLayout(LayoutIterator iter, int targetSpan) {
/*
* first pass, calculate the preferred sizes, adjustments needed because
* of margin collapsing, and the flexibility to adjust the sizes.
*/
long preferred = 0;
long currentPreferred = 0;
int lastMargin = 0;
int totalSpacing = 0;
int n = iter.getCount();
int adjustmentWeightsCount = LayoutIterator.WorstAdjustmentWeight + 1;
//max gain we can get adjusting elements with adjustmentWeight <= i
long gain[] = new long[adjustmentWeightsCount];
//max loss we can get adjusting elements with adjustmentWeight <= i
long loss[] = new long[adjustmentWeightsCount];
for (int i = 0; i < adjustmentWeightsCount; i++) {
gain[i] = loss[i] = 0;
}
for (int i = 0; i < n; i++) {
iter.setIndex(i);
int margin0 = lastMargin;
int margin1 = (int) iter.getLeadingCollapseSpan();
iter.setOffset(Math.max(margin0, margin1));
totalSpacing += iter.getOffset();
currentPreferred = (long)iter.getPreferredSpan(targetSpan);
iter.setSpan((int) currentPreferred);
preferred += currentPreferred;
gain[iter.getAdjustmentWeight()] +=
(long)iter.getMaximumSpan(targetSpan) - currentPreferred;
loss[iter.getAdjustmentWeight()] +=
currentPreferred - (long)iter.getMinimumSpan(targetSpan);
lastMargin = (int) iter.getTrailingCollapseSpan();
}
totalSpacing += lastMargin;
totalSpacing += 2 * iter.getBorderWidth();
for (int i = 1; i < adjustmentWeightsCount; i++) {
gain[i] += gain[i - 1];
loss[i] += loss[i - 1];
}
/*
* Second pass, expand or contract by as much as possible to reach
* the target span. This takes the margin collapsing into account
* prior to adjusting the span.
*/
// determine the adjustment to be made
int allocated = targetSpan - totalSpacing;
long desiredAdjustment = allocated - preferred;
long adjustmentsArray[] = (desiredAdjustment > 0) ? gain : loss;
desiredAdjustment = Math.abs(desiredAdjustment);
int adjustmentLevel = 0;
for (;adjustmentLevel <= LayoutIterator.WorstAdjustmentWeight;
adjustmentLevel++) {
// adjustmentsArray[] is sorted. I do not bother about
// binary search though
if (adjustmentsArray[adjustmentLevel] >= desiredAdjustment) {
break;
}
}
float adjustmentFactor = 0.0f;
if (adjustmentLevel <= LayoutIterator.WorstAdjustmentWeight) {
desiredAdjustment -= (adjustmentLevel > 0) ?
adjustmentsArray[adjustmentLevel - 1] : 0;
if (desiredAdjustment != 0) {
float maximumAdjustment =
adjustmentsArray[adjustmentLevel] -
((adjustmentLevel > 0) ?
adjustmentsArray[adjustmentLevel - 1] : 0
);
adjustmentFactor = desiredAdjustment / maximumAdjustment;
}
}
// make the adjustments
int totalOffset = (int)iter.getBorderWidth();;
for (int i = 0; i < n; i++) {
iter.setIndex(i);
iter.setOffset( iter.getOffset() + totalOffset);
if (iter.getAdjustmentWeight() < adjustmentLevel) {
iter.setSpan((int)
((allocated > preferred) ?
Math.floor(iter.getMaximumSpan(targetSpan)) :
Math.ceil(iter.getMinimumSpan(targetSpan))
)
);
} else if (iter.getAdjustmentWeight() == adjustmentLevel) {
int availableSpan = (allocated > preferred) ?
(int) iter.getMaximumSpan(targetSpan) - iter.getSpan() :
iter.getSpan() - (int) iter.getMinimumSpan(targetSpan);
int adj = (int)Math.floor(adjustmentFactor * availableSpan);
iter.setSpan(iter.getSpan() +
((allocated > preferred) ? adj : -adj));
}
totalOffset = (int) Math.min((long) iter.getOffset() +
(long) iter.getSpan(),
Integer.MAX_VALUE);
}
// while rounding we could lose several pixels.
int roundError = targetSpan - totalOffset -
(int)iter.getTrailingCollapseSpan() -
(int)iter.getBorderWidth();
int adj = (roundError > 0) ? 1 : -1;
roundError *= adj;
boolean canAdjust = true;
while (roundError > 0 && canAdjust) {
// check for infinite loop
canAdjust = false;
int offsetAdjust = 0;
// try to distribute roundError. one pixel per cell
for (int i = 0; i < n; i++) {
iter.setIndex(i);
iter.setOffset(iter.getOffset() + offsetAdjust);
int curSpan = iter.getSpan();
if (roundError > 0) {
int boundGap = (adj > 0) ?
(int)Math.floor(iter.getMaximumSpan(targetSpan)) - curSpan :
curSpan - (int)Math.ceil(iter.getMinimumSpan(targetSpan));
if (boundGap >= 1) {
canAdjust = true;
iter.setSpan(curSpan + adj);
offsetAdjust += adj;
roundError--;
}
}
}
}
}
/**
* Calculate the requirements needed to tile the requirements
* given by the iterator that would be tiled. The calculation
* takes into consideration margin collapsing.
*
* (copied from javax.swing.text.html.CSS)
*/
static SizeRequirements calculateTiledRequirements(LayoutIterator iter, SizeRequirements r) {
//System.out.println("claculateTiledRequirements");
long minimum = 0;
long maximum = 0;
long preferred = 0;
int lastMargin = 0;
int collapsed = 0;
int n = iter.getCount();
for (int i = 0; i < n; i++) {
iter.setIndex(i);
int margin0 = lastMargin;
int margin1 = (int) iter.getLeadingCollapseSpan();
int offset = Math.max(margin0, margin1);
if (offset != 0) {
// There is a collapse area
collapsed += offset - margin0;
}
preferred += (int) iter.getPreferredSpan(0);
minimum += iter.getMinimumSpan(0);
maximum += iter.getMaximumSpan(0);
lastMargin = (int) iter.getTrailingCollapseSpan();
}
// adjust for the collapsed area
minimum -= collapsed;
preferred -= collapsed;
maximum -= collapsed;
// set return value
if (r == null) {
r = new SizeRequirements();
}
r.minimum = (minimum > Integer.MAX_VALUE) ? Integer.MAX_VALUE : (int)minimum;
r.preferred = (preferred > Integer.MAX_VALUE) ? Integer.MAX_VALUE :(int) preferred;
r.maximum = (maximum > Integer.MAX_VALUE) ? Integer.MAX_VALUE :(int) maximum;
return r;
}
/* ------------------------------------------------------
end additional items from javax.swing.text.html.CSS
------------------------------------------------------ */
}
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