/*******************************************************************************
* 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.viewer;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import org.eclipse.core.runtime.Assert;
import org.eclipse.draw2d.geometry.Point;
import org.eclipse.draw2d.geometry.Rectangle;
import org.eclipse.gef.EditPart;
import org.eclipse.jst.pagedesigner.validation.caret.ActionData;
import org.eclipse.jst.pagedesigner.validation.caret.IPositionMediator;
/**
* FlowBoxLine collects EditParts in a line that cover the x or y coordinate of
* design view caret. An EditPart may be a widget that can't contains children,
* a TextEditPart which contains a set of flowbox, or a widgets container which
* contains some other editparts. For container, there are two types: white box
* to visitor, that is the container * visitor should consider its content, like
* <A>, <B>. etc, or black box to visitor, like <TABLE>. Black box means the
* container will be considered as a whole from outside. For non-container
* widget we only see TextEditPart can be broken at line end. For black box,
* only start box or latest box are used for final reference, for white box, we
* will process its content for reference <@see
* EditPartPositionHelper.findEditPartPosition>. For Text, the char that is
* closest to caret will be referenced. In this line class, tree types of
* EditPart are collected: TextEditPart, Widget, BlackBox container.
*
* @author mengbo
*/
public class FlowBoxLine {
private int _x;
private int _y;
private int _height;
private int _width;
private HashMap _parts = new HashMap();
private IPositionMediator _validator;
private Point _point;
/**
* @param rect
* @param validator
* @param point
*/
public FlowBoxLine(Rectangle rect, IPositionMediator validator, Point point) {
_x = rect.x;
_y = rect.y;
_width = rect.width;
_height = rect.height;
_validator = validator;
_point = point;
}
/**
* @return Returns the _height.
*/
public int getHeight() {
return _height;
}
/**
* @return Returns the _width.
*/
public int getWidth() {
return _width;
}
/**
* @return Returns the _x.
*/
public int getX() {
return _x;
}
/**
* @return Returns the _y.
*/
public int getY() {
return _y;
}
/**
* @return the part list
*/
public Map getPartsList() {
return _parts;
}
/**
* @return the right bottom coordiate
*/
public Point getRightBottom() {
return new Point(_x + _width, _y + _height);
}
/**
* @param part
* @param point
* @return layout part added
*/
public boolean addLayoutPart(EditPart part, Point point) {
Assert.isTrue(part != null && point != null);
Rectangle rect = null;
LayoutPart lPart = new LayoutPart(part, point);
if (_parts.size() == 0) {
resetBounds(lPart);
return true;
}
if (!interact(lPart)) {
if (closer(lPart)) {
resetBounds(lPart);
return true;
}
return false;
}
rect = lPart.getAbsoluteBounds();
int xx = Math.min(rect.x, _x);
int width = Math.max(rect.getRight().x, getRightBottom().x) - xx;
int yy = Math.min(rect.y, _y);
int height = Math.max(rect.getBottom().y, getRightBottom().y) - yy;
_x = xx;
_y = yy;
_width = width;
_height = height;
_parts.put(part, lPart);
return true;
}
/**
* @param lPart
* @return true if layout part is within the right bottom corner of the line
*/
public boolean interact(LayoutPart lPart) {
Rectangle rect = lPart.getAbsoluteBounds();
return !(rect.getBottom().y <= _y || getRightBottom().y <= rect.y);
}
/**
* @param part
* @return true if the line contains part
*/
public boolean contains(EditPart part) {
return _parts.containsKey(part);
}
/**
* @param part
* @return true if the line contains part
*/
public boolean contains(LayoutPart part) {
return _parts.containsValue(part);
}
/**
* @param part
* @return the layout part for part
*/
public LayoutPart getLayoutPart(EditPart part) {
return (LayoutPart) _parts.get(part);
}
//
/**
* For vertical movement, we need to see if there is part cover p.x.
*
* @return the closest edit part
*/
public EditPart getClosestPart() {
if (_parts.isEmpty()) {
return null;
}
Collection parts = _parts.values();
Iterator iterator = parts.iterator();
LayoutPart closestPart = (LayoutPart) iterator.next();
if (iterator.hasNext()) {
while (iterator.hasNext()) {
LayoutPart nextPart = (LayoutPart) iterator.next();
closestPart = CaretPositionResolver.getCloserPart(closestPart,
nextPart, _point);
}
}
// for children.
LayoutPart result = null;
if (_validator.getActionData().getActionType() == ActionData.KEYBOARD_NAVAGATION
|| //
closestPart.isInline()) {
result = CaretPositionResolver.getInstance(_validator, _point)
.resolveClosestPartFrom(closestPart);
} else {
result = closestPart;
}
if (result != null) {
return result.getPart();
}
return null;
}
/**
* See how close the part,box is closer to point, if it is closer than
* current FlowBoxLine. return true;
*/
private boolean closer(LayoutPart lPart) {
int lineYOffset = Math.abs(CaretPositionResolver.getYDistance(
getBounds(), _point));
int partYOffset = Math.abs(CaretPositionResolver.getYDistance(lPart
.getAbsoluteBounds(), _point));
return lineYOffset > partYOffset;
}
/**
* @return the bounding rectangle of the line
*/
public Rectangle getBounds() {
return new Rectangle(_x, _y, _width, _height);
}
private void resetBounds(Rectangle rect) {
_x = rect.x;
_y = rect.y;
_width = rect.width;
_height = rect.height;
}
private void resetBounds(LayoutPart lPart) {
EditPart part = lPart.getPart();
Rectangle rect = lPart.getAbsoluteBounds();
resetBounds(rect);
_parts.clear();
_parts.put(part, lPart);
}
}