/* * @(#)LineView.java	1.18 03/12/19 * * Copyright 2004 Sun Microsystems, Inc. All rights reserved. * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. */package javax.swing.text.html;import java.util.Enumeration;import java.awt.*;import javax.swing.*;import javax.swing.border.*;import javax.swing.event.*;import javax.swing.text.*;/** * A view implementation to display an unwrapped  * preformatted line.<p> * This subclasses ParagraphView, but this really only contains one * Row of text. * * @author  Timothy Prinzing * @version 1.18 12/19/03 */class LineView extends ParagraphView {    /** Last place painted at. */    int tabBase;    /**     * Creates a LineView object.     *     * @param elem the element to wrap in a view     */    public LineView(Element elem) {	super(elem);    }    /**     * Preformatted lines are not suppressed if they      * have only whitespace, so they are always visible.     */    public boolean isVisible() {	return true;    }    /**     * Determines the minimum span for this view along an     * axis.  The preformatted line should refuse to be      * sized less than the preferred size.     *     * @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 View#getPreferredSpan     */    public float getMinimumSpan(int axis) {	return getPreferredSpan(axis);    }    /**     * Gets the resize weight for the specified axis.     *     * @param axis may be either X_AXIS or Y_AXIS     * @return the weight     */    public int getResizeWeight(int axis) {	switch (axis) {	case View.X_AXIS:	    return 1;	case View.Y_AXIS:	    return 0;	default:	    throw new IllegalArgumentException("Invalid axis: " + axis);	}    }    /**     * Gets the alignment for an axis.     *     * @param axis may be either X_AXIS or Y_AXIS     * @return the alignment     */    public float getAlignment(int axis) {	if (axis == View.X_AXIS) {	    return 0;	}	return super.getAlignment(axis);    }    /**     * Lays out the children.  If the layout span has changed,     * the rows are rebuilt.  The superclass functionality     * is called after checking and possibly rebuilding the     * rows.  If the height has changed, the      * <code>preferenceChanged</code> method is called     * on the parent since the vertical preference is      * rigid.     *     * @param width  the width to lay out against >= 0.  This is     *   the width inside of the inset area.     * @param height the height to lay out against >= 0 (not used     *   by paragraph, but used by the superclass).  This     *   is the height inside of the inset area.     */    protected void layout(int width, int height) {	super.layout(Integer.MAX_VALUE - 1, height);    }    /**     * Returns the next tab stop position given a reference position.     * This view implements the tab coordinate system, and calls     * <code>getTabbedSpan</code> on the logical children in the process      * of layout to determine the desired span of the children.  The     * logical children can delegate their tab expansion upward to     * the paragraph which knows how to expand tabs.      * <code>LabelView</code> is an example of a view that delegates     * its tab expansion needs upward to the paragraph.     * <p>     * This is implemented to try and locate a <code>TabSet</code>     * in the paragraph element's attribute set.  If one can be     * found, its settings will be used, otherwise a default expansion     * will be provided.  The base location for for tab expansion     * is the left inset from the paragraphs most recent allocation     * (which is what the layout of the children is based upon).     *     * @param x the X reference position     * @param tabOffset the position within the text stream     *   that the tab occurred at >= 0.     * @return the trailing end of the tab expansion >= 0     * @see TabSet     * @see TabStop     * @see LabelView     */    public float nextTabStop(float x, int tabOffset) {	// If the text isn't left justified, offset by 10 pixels!	if (getTabSet() == null &&	    StyleConstants.getAlignment(getAttributes()) ==	    StyleConstants.ALIGN_LEFT) {	    return getPreTab(x, tabOffset);	}	return super.nextTabStop(x, tabOffset);    }    /**     * Returns the location for the tab.     */    protected float getPreTab(float x, int tabOffset) {	Document d = getDocument();	View v = getViewAtPosition(tabOffset, null);	if ((d instanceof StyledDocument) && v != null) {	    // Assume f is fixed point.	    Font f = ((StyledDocument)d).getFont(v.getAttributes());            Container c = getContainer();	    FontMetrics fm = (c != null) ? c.getFontMetrics(f) :                Toolkit.getDefaultToolkit().getFontMetrics(f);	    int width = getCharactersPerTab() * fm.charWidth('W');	    int tb = (int)getTabBase();	    return (float)((((int)x - tb) / width + 1) * width + tb);	}	return 10.0f + x;    }    /**     * @return number of characters per tab, 8.     */    protected int getCharactersPerTab() {	return 8;    }}