/*******************************************************************************
 * Copyright (c) 2000, 2008 IBM Corporation 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:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.draw2d.text;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.eclipse.swt.SWT;

import org.eclipse.draw2d.Border;
import org.eclipse.draw2d.ColorConstants;
import org.eclipse.draw2d.Graphics;
import org.eclipse.draw2d.geometry.Rectangle;

/**
 * A <code>FlowFigure</code> represented by multiple <code>LineBox</code> fragments. An
 * <code>InlineFlow</code>'s parent must be either a {@link BlockFlow} or another
 * InlineFlow.
 * 
 * <P>An InlineFlow may contain other InlineFlow figures.
 * 
 * <P>WARNING: This class is not intended to be subclassed by clients.
 * @author Randy Hudson
 * @since 2.0
 */
public class InlineFlow extends FlowFigure {

List fragments = new ArrayList(1);

/**
 * Iterates over the children to find the width before a line-break is encountered.
 * @see org.eclipse.draw2d.text.FlowFigure#addLeadingWordRequirements(int[])
 */
public boolean addLeadingWordRequirements(int[] width) {
	Iterator iter = getChildren().iterator();
	while (iter.hasNext()) {
		if (((FlowFigure)iter.next()).addLeadingWordRequirements(width))
			return true;
	}
	return false;
}

/**
 * Extended to return false if the point is not also contained by at least one fragment.
 * @return <code>true</code> if a fragment contains the given point
 * @param x the relative x coordinate
 * @param y the relative y coordinate
 */
public boolean containsPoint(int x, int y) {
	if (super.containsPoint(x, y)) {
		List frags = getFragments();
		for (int i = 0; i < frags.size(); i++)
			if (((FlowBox)frags.get(i)).containsPoint(x, y))
				return true;
	}
	
	return false;
}

/**
 * @see FlowFigure#createDefaultFlowLayout()
 */
protected FlowFigureLayout createDefaultFlowLayout() {
	return new InlineFlowLayout(this);
}

/**
 * Returns the <code>FlowBox</code> fragments contained in this InlineFlow.  The returned
 * list should not be modified.
 * @return The fragments
 */
public List getFragments() {
	return fragments;
}

/**
 * Overridden to paint a {@link FlowBorder} if present, and draw selection. The border is
 * painted first, followed by selection which is generally done in XOR, which still allows
 * the border to be seen.
 * @param graphics the graphics
 */
protected void paintBorder(Graphics graphics) {
	if (getBorder() != null) {
		FlowBorder fb = (FlowBorder)getBorder();
		List frags = getFragments();
		Rectangle where = new Rectangle();
		int sides;
		for (int i = 0; i < frags.size(); i++) {
			FlowBox box = (FlowBox)frags.get(i);
			
			where.x = box.getX();
			where.width = box.getWidth();
			where.y = -box.getAscentWithBorder();
			where.height = box.getDescentWithBorder() - where.y;
			where.y += box.getBaseline();
			sides = 0;
			if (i == 0)
				sides = SWT.LEAD;
			if (i == frags.size() - 1)
				sides |= SWT.TRAIL;
			fb.paint(this, graphics, where, sides);
		}
		graphics.restoreState();
	}
	if (selectionStart != -1)
		paintSelection(graphics);
}

/**
 * Renders the XOR selection rectangles to the graphics.
 * @param graphics the graphics to paint on
 * @since 3.1
 */
protected void paintSelection(Graphics graphics) {
	graphics.restoreState();
	graphics.setXORMode(true);
	graphics.setBackgroundColor(ColorConstants.white);
	List list = getFragments();
	FlowBox box;
	for (int i = 0; i < list.size(); i++) {
		box = (FlowBox)list.get(i);
		int top = box.getLineRoot().getVisibleTop();
		int bottom = box.getLineRoot().getVisibleBottom();
		graphics.fillRectangle(box.getX(), top, box.getWidth(), bottom - top);
	}
}

/**
 * @see FlowFigure#postValidate()
 */
public void postValidate() {
	List list = getFragments();
	FlowBox box;
	int left = Integer.MAX_VALUE, top = left;
	int right = Integer.MIN_VALUE, bottom = right;
	
	for (int i = 0; i < list.size(); i++) {
		box = (FlowBox)list.get(i);
		left = Math.min(left, box.getX());
		right = Math.max(right, box.getX() + box.getWidth());
		top = Math.min(top, box.getLineRoot().getVisibleTop());
		bottom = Math.max(bottom, box.getLineRoot().getVisibleBottom());
	}
	
	setBounds(new Rectangle(left, top, right - left, bottom - top));
	repaint();
	list = getChildren();
	for (int i = 0; i < list.size(); i++)
		((FlowFigure)list.get(i)).postValidate();
}

/**
 * Overridden to assert that only {@link FlowBorder} is used. <code>null</code> is still a
 * valid value as well.
 * @param  border <code>null</code> or a FlowBorder
 */
public void setBorder(Border border) {
	if (border == null || border instanceof FlowBorder)
		super.setBorder(border);
	else
		throw new RuntimeException("Border must be an instance of FlowBorder"); //$NON-NLS-1$
}

}
