/* * @(#)ParagraphView.java	1.29 04/09/14 * * Copyright 2004 Sun Microsystems, Inc. All rights reserved. * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. */package javax.swing.text.html;import java.awt.*;import javax.swing.SizeRequirements;import javax.swing.event.DocumentEvent;import javax.swing.text.Document;import javax.swing.text.Element;import javax.swing.text.AttributeSet;import javax.swing.text.StyleConstants;import javax.swing.text.View;import javax.swing.text.ViewFactory;import javax.swing.text.BadLocationException;import javax.swing.text.JTextComponent;/** * Displays the a paragraph, and uses css attributes for its * configuration. * * @author  Timothy Prinzing * @version 1.29 09/14/04 */public class ParagraphView extends javax.swing.text.ParagraphView {    /**     * Constructs a ParagraphView for the given element.     *     * @param elem the element that this view is responsible for     */    public ParagraphView(Element elem) {	super(elem);    }    /**     * 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 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;    }    /**     * Sets up the paragraph from css attributes instead of     * the values found in StyleConstants (i.e. which are used     * by the superclass).  Since     */    protected void setPropertiesFromAttributes() {	StyleSheet sheet = getStyleSheet();	attr = sheet.getViewAttributes(this);	painter = sheet.getBoxPainter(attr);	if (attr != null) {	    super.setPropertiesFromAttributes();	    setInsets((short) painter.getInset(TOP, this),		      (short) painter.getInset(LEFT, this),		      (short) painter.getInset(BOTTOM, this),		      (short) painter.getInset(RIGHT, this));	    Object o = attr.getAttribute(CSS.Attribute.TEXT_ALIGN);	    if (o != null) {		// set horizontal alignment		String ta = o.toString();		if (ta.equals("left")) {		    setJustification(StyleConstants.ALIGN_LEFT);		} else if (ta.equals("center")) {		    setJustification(StyleConstants.ALIGN_CENTER);		} else if (ta.equals("right")) {		    setJustification(StyleConstants.ALIGN_RIGHT);		} else if (ta.equals("justify")) {		    setJustification(StyleConstants.ALIGN_JUSTIFIED);		}	    }            // Get the width/height            cssWidth = (CSS.LengthValue)attr.getAttribute(                                        CSS.Attribute.WIDTH);            cssHeight = (CSS.LengthValue)attr.getAttribute(                                         CSS.Attribute.HEIGHT);	}    }    protected StyleSheet getStyleSheet() {	HTMLDocument doc = (HTMLDocument) getDocument();	return doc.getStyleSheet();    }    /**     * Calculate the needs for the paragraph along the minor axis.     * This implemented to use the requirements of the superclass,     * modified slightly to set a minimum span allowed.  Typical     * html rendering doesn't let the view size shrink smaller than     * the length of the longest word.       */    protected SizeRequirements calculateMinorAxisRequirements(int axis, SizeRequirements r) {	r = super.calculateMinorAxisRequirements(axis, r);        if (!BlockView.spanSetFromAttributes(axis, r, cssWidth, cssHeight)) {            // PENDING(prinz) Need to make this better so it doesn't require            // InlineView and works with font changes within the word.            // find the longest minimum span.            float min = 0;            int n = getLayoutViewCount();            for (int i = 0; i < n; i++) {                View v = getLayoutView(i);                if (v instanceof InlineView) {                    float wordSpan = ((InlineView) v).getLongestWordSpan();                    min = Math.max(wordSpan, min);                } else {                    min = Math.max(v.getMinimumSpan(axis), min);                }            }            r.minimum = Math.max(r.minimum, (int) min);            r.preferred = Math.max(r.minimum,  r.preferred);            r.maximum = Math.max(r.preferred, r.maximum);        }        else {            // Offset by the margins so that pref/min/max return the            // right value.            int margin = (axis == X_AXIS) ? getLeftInset() + getRightInset() :                                            getTopInset() + getBottomInset();            r.minimum -= margin;            r.preferred -= margin;            r.maximum -= margin;        }	return r;    }    /**     * Indicates whether or not this view should be      * displayed.  If none of the children wish to be     * displayed and the only visible child is the      * break that ends the paragraph, the paragraph     * will not be considered visible.  Otherwise,     * it will be considered visible and return true.     *      * @return true if the paragraph should be displayed     */    public boolean isVisible() {		int n = getLayoutViewCount() - 1;	for (int i = 0; i < n; i++) {	    View v = getLayoutView(i);	    if (v.isVisible()) {		return true;	    }	}	if (n > 0) {	    View v = getLayoutView(n);	    if ((v.getEndOffset() - v.getStartOffset()) == 1) {		return false;	    }	}	// If it's the last paragraph and not editable, it shouldn't	// be visible.	if (getStartOffset() == getDocument().getLength()) {	    boolean editable = false;	    Component c = getContainer();	    if (c instanceof JTextComponent) {		editable = ((JTextComponent)c).isEditable();	    }	    if (!editable) {		return false;	    }	}	return true;    }    /**     * Renders using the given rendering surface and area on that     * surface.  This is implemented to delgate to the superclass     * after stashing the base coordinate for tab calculations.     *     * @param g the rendering surface to use     * @param a the allocated region to render into     * @see View#paint     */    public void paint(Graphics g, Shape a) {        if (a == null) {            return;        }	Rectangle r;	if (a instanceof Rectangle) {	    r = (Rectangle) a;	} else {	    r = a.getBounds();	}	painter.paint(g, r.x, r.y, r.width, r.height, this);        super.paint(g, a);    }    /**     * Determines the preferred span for this view.  Returns     * 0 if the view is not visible, otherwise it calls the     * superclass method to get the preferred span.     * axis.     *     * @param axis may be either View.X_AXIS or View.Y_AXIS     * @return   the span the view would like to be rendered into;     *           typically the view is told to render into the span     *           that is returned, although there is no guarantee;     *           the parent may choose to resize or break the view     * @see javax.swing.text.ParagraphView#getPreferredSpan     */    public float getPreferredSpan(int axis) {	if (!isVisible()) {	    return 0;	}	return super.getPreferredSpan(axis);    }    /**     * Determines the minimum span for this view along an     * axis.  Returns 0 if the view is not visible, otherwise      * it calls the superclass method to get the minimum span.     *     * @param axis may be either <code>View.X_AXIS</code> or      *	<code>View.Y_AXIS</code>     * @return  the minimum span the view can be rendered into     * @see javax.swing.text.ParagraphView#getMinimumSpan     */    public float getMinimumSpan(int axis) {	if (!isVisible()) {	    return 0;	}	return super.getMinimumSpan(axis);    }    /**     * Determines the maximum span for this view along an     * axis.  Returns 0 if the view is not visible, otherwise     * it calls the superclass method ot get the maximum span.     *     * @param axis may be either <code>View.X_AXIS</code> or      *	<code>View.Y_AXIS</code>     * @return  the maximum span the view can be rendered into     * @see javax.swing.text.ParagraphView#getMaximumSpan     */    public float getMaximumSpan(int axis) {	if (!isVisible()) {	    return 0;	}	return super.getMaximumSpan(axis);    }    private AttributeSet attr;    private StyleSheet.BoxPainter painter;    private CSS.LengthValue cssWidth;    private CSS.LengthValue cssHeight;}