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/*
* Copyright 1997-2003 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Sun designates this
* particular file as subject to the "Classpath" exception as provided
* by Sun in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*/
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
*/
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;
}
}
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