| /* |
| * Copyright (c) 1997, 2003, Oracle and/or its affiliates. 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.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; |
| } |
| } |