/*******************************************************************************
* Copyright (c) 2006 Sybase, Inc. and others.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Sybase, Inc. - initial API and implementation
*******************************************************************************/
package org.eclipse.jst.pagedesigner.css2.layout;
import org.eclipse.jst.pagedesigner.css2.property.VerticalAlignMeta;
import org.eclipse.jst.pagedesigner.css2.value.Length;
import org.eclipse.swt.graphics.FontMetrics;
/**
* A composite box representing a single line. LineBox calculates its ascent and
* descent from the child boxes it contains. Clients can call
* {@link #getAscent()}or {@link#getHeight()}at any time and expect valid
* values. The child boxes that are added to a line have unspecied locations
* until {@link #commit()}is called, at which time the child boxes are layed
* out in left-to-right order, and their baselines are all aligned vertically.
*
*/
public class LineBox extends CompositeBox {
private final static int BASELINE = 0;
private final static int MIDDLE = 1;
private final static int SUB = 2;
private final static int SUPER = 3;
private final static int TEXT_TOP = 4;
private final static int TEXT_BOTTOM = 5;
private final static int TOP = 6;
private final static int BOTTOM = 7;
private final static int LENGTH = 8;
private int _ascent = 0;
private int _descent = 0;
private int _fontAscent = 0;
private int _fontDescent = 0;
private int _fontLeading = 0;
private Object _horizonalData = null;
private Object _htmlInitData = null;
private int _accumlatedWidth = 0;
/**
* Removes all owned fragments and invalidates this CompositeBox.
*/
public void clear() {
super.clear();
_horizonalData = null;
_htmlInitData = null;
}
/**
* Committing a LineBox will position its children correctly. All children
* boxes are made to have the same baseline, and are layed out from
* left-to-right.
*/
public void commit() {
int baseline = getBaseline();
int xLocation = _x;
for (int i = 0; i < _fragments.size(); i++) {
FlowBox block = (FlowBox) _fragments.get(i);
block._x = xLocation + block._marginInsets.left;
xLocation = block._x + block._width + block._marginInsets.right;
if (_fragments.size() > 1 && block instanceof TextFragmentBox) {
TextFragmentBox textBox = (TextFragmentBox) block;
if (textBox.getTextData().length() == 0) {
textBox._height = _fontAscent + _fontDescent + _fontLeading;
textBox.setAscent(_fontAscent + _fontLeading);
block._y = this._y;
continue;
}
}
switch (getVerticalAlignType(block)) {
case TOP:
block._y = this._y;
break;
case BOTTOM:
block._y = this.getBaseline() - (block.getHeight() - _descent);
break;
case MIDDLE:
int halfXHeight = getHalfXHeight();
block._y = this.getBaseline() - halfXHeight
- (block.getHeight() + 1) / 2;
break;
case TEXT_TOP:
block._y = this.getBaseline() - _fontAscent - _fontLeading;
break;
case TEXT_BOTTOM:
block._y = this.getBaseline() - (block._height - _fontDescent);
break;
case LENGTH:
block._y = this.getBaseline() + getIncrement(block);
break;
case SUPER:
block._y = this.getBaseline() - getHalfXHeight() * 2
- block._height;
break;
case SUB:
block._y = this.getBaseline() - block._height * _fontLeading
/ getFontHeight();
break;
case BASELINE:
default:
block.makeBaseline(baseline);
break;
}
if (block instanceof LineBox) {
((LineBox) block).commit();
}
}
}
protected int getVerticalAlignType(FlowBox box) {
Object data = box.getVerticalAlignData();
if (data != null) {
if (data instanceof Length) {
return LENGTH;
} else if (VerticalAlignMeta.BASELINE.equals(data)) {
return BASELINE;
} else if (VerticalAlignMeta.MIDDLE.equals(data)) {
return MIDDLE;
} else if (VerticalAlignMeta.SUB.equals(data)) {
return SUB;
} else if (VerticalAlignMeta.SUPER.equals(data)) {
return SUPER;
} else if (VerticalAlignMeta.TEXT_TOP.equals(data)) {
return TEXT_TOP;
} else if (VerticalAlignMeta.TEXT_BOTTOM.equals(data)) {
return TEXT_BOTTOM;
} else if (VerticalAlignMeta.TOP.equals(data)) {
return TOP;
} else if (VerticalAlignMeta.BOTTOM.equals(data)) {
return BOTTOM;
}
return BASELINE;
}
return BASELINE;
}
/**
* @see org.eclipse.jst.pagedesigner.css2.layout.FlowBox#getAscent()
*/
public int getAscent() {
// because at initial, ascent is 0. And the linebox
// could have some size setting without children. In
// that case, we need handle differently.
if (_ascent == 0 && _fragments.isEmpty()) {
return getHeight();
}
return _ascent;
}
/**
* Returns the width available to child fragments.
*
* @return the width in pixels
*/
public int getAvailableWidth() {
if (_recommendedWidth < 0) {
return Integer.MAX_VALUE;
}
int availableWidth = _recommendedWidth - _accumlatedWidth;
if (availableWidth < 0) {
availableWidth = 0;
}
return availableWidth;
}
/**
* Returns the baseline of this LineBox, which is the y value plus the
* ascent.
*
* @return the baseline value.
*/
public int getBaseline() {
return _y + getAscent();
}
/**
* @see CompositeBox#resetInfo()
*/
protected void resetInfo() {
super.resetInfo();
_accumlatedWidth = 0;
_ascent = 0;
}
/**
* @see CompositeBox#unionInfo(FlowBox)
*/
protected void unionInfo(FlowBox blockInfo) {
if (blockInfo instanceof TextFragmentBox) {
if (((TextFragmentBox) blockInfo).getTextData().length() == 0) {
return;
}
}
if (_fragments == null || _fragments.isEmpty()) {
this._ascent = 0;
this._descent = 0;
this._height = 0;
}
int valign = getVerticalAlignType(blockInfo);
if (valign == BASELINE) {
_ascent = Math.max(_ascent, blockInfo.getAscent());
if (blockInfo instanceof WidgetBox) {
_descent = 0;
} else {
_descent = Math.max(_descent, blockInfo.getDescent());
}
_height = Math.max(_height, _ascent + _descent);
} else if (valign == MIDDLE) {
int halfXHeight = getHalfXHeight();
_ascent = Math.max(_ascent, (blockInfo.getHeight() + 1) / 2
+ halfXHeight);
_descent = Math.max(_descent, blockInfo.getHeight() / 2
- halfXHeight);
_height = Math.max(_height, _ascent + _descent);
} else if (valign == TEXT_TOP) {
_ascent = Math.max(_ascent, _fontAscent + _fontLeading);
_descent = Math.max(_descent, blockInfo.getHeight() - _fontAscent
- _fontLeading);
_height = Math.max(_height, _ascent + _descent);
} else if (valign == TEXT_BOTTOM) {
_ascent = Math.max(_ascent, blockInfo.getHeight() - _fontDescent);
_descent = Math.max(_descent, _fontDescent);
_height = Math.max(_height, _ascent + _descent);
} else if (valign == SUB) {
int blockTop = blockInfo._height * _fontLeading / getFontHeight();
_ascent = Math.max(_ascent, blockTop);
_descent = Math.max(_descent, blockInfo.getHeight() - blockTop);
_height = Math.max(_height, _ascent + _descent);
} else if (valign == SUPER) {
int blockTop = blockInfo._height;
_ascent = Math.max(_ascent, getHalfXHeight() * 2 + blockTop);
_height = Math.max(_height, _ascent + _descent);
} else if (valign == LENGTH) {
int increment = getIncrement(blockInfo);
_ascent = Math.max(_ascent, blockInfo.getAscent() + increment);
_descent = Math.max(_descent, blockInfo.getDescent() - increment);
_height = Math.max(_height, _ascent + _descent);
} else if (valign == TOP) {
_descent = Math.max(_descent, blockInfo.getHeight() - _ascent);
_height = Math.max(_height, _ascent + _descent);
} else if (valign == BOTTOM) {
// XXX:the render of IE is not consistent with spec, mozilla is. so
// we follow mozilla's implementation.
_ascent = Math.max(_ascent, blockInfo.getHeight() - _descent);
_height = Math.max(_height, _ascent + _descent);
} else {
_ascent = Math.max(_ascent, blockInfo.getAscent());
_descent = Math.max(_descent, blockInfo.getDescent());
_height = Math.max(_height, blockInfo.getHeight());
}
_accumlatedWidth += blockInfo._width
+ blockInfo._marginInsets.getWidth();
if (_accumlatedWidth > _width) {
_width = _accumlatedWidth;
}
}
private int getIncrement(FlowBox blockInfo) {
int valign = getVerticalAlignType(blockInfo);
if (valign == LENGTH) {
int increment = 0;
Length length = (Length) blockInfo.getVerticalAlignData();
if (length.isPercentage()) {
increment = length.getValue() * getFontHeight() / 100;
} else {
increment = length.getValue();
}
return increment;
}
return 0;
}
/**
* @see org.eclipse.draw2d.geometry.Rectangle#isEmpty()
*/
public boolean isOccupied() {
if (_width > 0) {
return true;
}
if (_fragments.isEmpty()) {
return false;
}
// int size = _fragments.size();
// if (size > 1)
// {
// return true;
// }
// ok, we have one segment
// FlowBox box = (FlowBox) _fragments.get(0);
// if (box instanceof TextFragmentBox)
// {
// if (((TextFragmentBox) box).getTextData().length() == 0)
// {
// // this is an empty string text box.
// return false;
// }
// }
return true;
}
public boolean isEmptyStringLine() {
// if(this.getWidth() == 0)
// {
// return true;
// }
// else
// {
// return false;
// }
if (_fragments.size() == 1) {
FlowBox box = (FlowBox) _fragments.get(0);
if (box instanceof TextFragmentBox) {
if (box instanceof TextFragmentBox) {
if (((TextFragmentBox) box).getTextData().length() == 0) {
return true;
}
}
}
}
return false;
}
/**
* @param fontMetrics
*/
public void setFontMetrics(FontMetrics fontMetrics) {
if (fontMetrics != null) {
_fontAscent = fontMetrics.getAscent();
_fontDescent = fontMetrics.getDescent();
_fontLeading = fontMetrics.getLeading();
// if (_fragments == null || _fragments.isEmpty())
// {
// this._ascent = _fontAscent + _fontLeading;
// this._descent = _fontDescent;
// if (this._height < this._ascent + this._descent)
// {
// this._height = this._ascent + this._descent;
// }
// }
} else {
_fontAscent = 0;
_fontDescent = 0;
_fontLeading = 0;
}
}
private int getHalfXHeight() {
return (_fontAscent + _fontDescent + _fontLeading) / 5;
}
private int getFontHeight() {
return _fontAscent + _fontDescent + _fontLeading;
}
/**
* @return Returns the horizonalData.
*/
public Object getHorizonalData() {
return _horizonalData;
}
/**
* @param horizonalData
* The horizonalData to set.
*/
public void setHorizonalData(Object horizonalData) {
this._horizonalData = horizonalData;
}
/**
* @return Returns the htmlInitData.
*/
public Object getHtmlInitData() {
return _htmlInitData;
}
/**
* @param htmlInitData
* The htmlInitData to set.
*/
public void setHtmlInitData(Object htmlInitData) {
this._htmlInitData = htmlInitData;
}
}
