author | serb |
Mon, 06 Mar 2017 22:52:45 +0300 | |
changeset 44155 | 1bf93336ea45 |
parent 41807 | f9eb6cb54fed |
child 44655 | 06871a50a4b5 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1999, 2014, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package javax.swing.text; |
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import java.awt.*; |
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/** |
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* A class to perform rendering of the glyphs. |
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* This can be implemented to be stateless, or |
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* to hold some information as a cache to |
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* facilitate faster rendering and model/view |
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* translation. At a minimum, the GlyphPainter |
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* allows a View implementation to perform its |
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* duties independent of a particular version |
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* of JVM and selection of capabilities (i.e. |
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* shaping for i18n, etc). |
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* <p> |
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* This implementation is intended for operation |
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* under the JDK1.1 API of the Java Platform. |
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* Since the JDK is backward compatible with |
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* JDK1.1 API, this class will also function on |
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* Java 2. The JDK introduces improved |
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* API for rendering text however, so the GlyphPainter2 |
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* is recommended for the DK. |
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* |
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* @author Timothy Prinzing |
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* @see GlyphView |
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*/ |
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class GlyphPainter1 extends GlyphView.GlyphPainter { |
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/** |
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* Determine the span the glyphs given a start location |
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* (for tab expansion). |
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*/ |
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public float getSpan(GlyphView v, int p0, int p1, |
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TabExpander e, float x) { |
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sync(v); |
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Segment text = v.getText(p0, p1); |
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int[] justificationData = getJustificationData(v); |
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int width = Utilities.getTabbedTextWidth(v, text, metrics, (int) x, e, p0, |
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justificationData); |
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SegmentCache.releaseSharedSegment(text); |
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return width; |
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} |
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public float getHeight(GlyphView v) { |
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sync(v); |
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return metrics.getHeight(); |
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} |
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/** |
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* Fetches the ascent above the baseline for the glyphs |
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* corresponding to the given range in the model. |
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*/ |
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public float getAscent(GlyphView v) { |
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sync(v); |
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return metrics.getAscent(); |
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} |
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/** |
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* Fetches the descent below the baseline for the glyphs |
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* corresponding to the given range in the model. |
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*/ |
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public float getDescent(GlyphView v) { |
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sync(v); |
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return metrics.getDescent(); |
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} |
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/** |
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* Paints the glyphs representing the given range. |
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*/ |
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public void paint(GlyphView v, Graphics g, Shape a, int p0, int p1) { |
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sync(v); |
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Segment text; |
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TabExpander expander = v.getTabExpander(); |
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Rectangle alloc = (a instanceof Rectangle) ? (Rectangle)a : a.getBounds(); |
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// determine the x coordinate to render the glyphs |
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float x = alloc.x; |
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int p = v.getStartOffset(); |
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int[] justificationData = getJustificationData(v); |
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if (p != p0) { |
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text = v.getText(p, p0); |
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float width = Utilities.getTabbedTextWidth(v, text, metrics, x, |
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expander, p, |
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justificationData); |
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x += width; |
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SegmentCache.releaseSharedSegment(text); |
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} |
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// determine the y coordinate to render the glyphs |
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float y = alloc.y + metrics.getHeight() - metrics.getDescent(); |
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// render the glyphs |
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text = v.getText(p0, p1); |
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g.setFont(metrics.getFont()); |
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Utilities.drawTabbedText(v, text, x, y, g, expander,p0, |
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justificationData, true); |
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SegmentCache.releaseSharedSegment(text); |
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} |
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public Shape modelToView(GlyphView v, int pos, Position.Bias bias, |
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Shape a) throws BadLocationException { |
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sync(v); |
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Rectangle alloc = (a instanceof Rectangle) ? (Rectangle)a : a.getBounds(); |
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int p0 = v.getStartOffset(); |
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int p1 = v.getEndOffset(); |
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TabExpander expander = v.getTabExpander(); |
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Segment text; |
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if(pos == p1) { |
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// The caller of this is left to right and borders a right to |
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// left view, return our end location. |
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return new Rectangle(alloc.x + alloc.width, alloc.y, 0, |
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metrics.getHeight()); |
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} |
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if ((pos >= p0) && (pos <= p1)) { |
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// determine range to the left of the position |
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text = v.getText(p0, pos); |
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int[] justificationData = getJustificationData(v); |
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int width = Utilities.getTabbedTextWidth(v, text, metrics, alloc.x, expander, p0, |
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justificationData); |
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SegmentCache.releaseSharedSegment(text); |
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return new Rectangle(alloc.x + width, alloc.y, 0, metrics.getHeight()); |
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} |
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throw new BadLocationException("modelToView - can't convert", p1); |
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} |
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/** |
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* Provides a mapping from the view coordinate space to the logical |
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* coordinate space of the model. |
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* |
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* @param v the view containing the view coordinates |
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* @param x the X coordinate |
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* @param y the Y coordinate |
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* @param a the allocated region to render into |
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* @param biasReturn always returns <code>Position.Bias.Forward</code> |
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* as the zero-th element of this array |
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* @return the location within the model that best represents the |
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* given point in the view |
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* @see View#viewToModel |
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*/ |
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public int viewToModel(GlyphView v, float x, float y, Shape a, |
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Position.Bias[] biasReturn) { |
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sync(v); |
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Rectangle alloc = (a instanceof Rectangle) ? (Rectangle)a : a.getBounds(); |
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int p0 = v.getStartOffset(); |
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int p1 = v.getEndOffset(); |
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TabExpander expander = v.getTabExpander(); |
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Segment text = v.getText(p0, p1); |
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int[] justificationData = getJustificationData(v); |
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int offs = Utilities.getTabbedTextOffset(v, text, metrics, |
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alloc.x, (int) x, expander, p0, |
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justificationData); |
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SegmentCache.releaseSharedSegment(text); |
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int retValue = p0 + offs; |
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if(retValue == p1) { |
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// No need to return backward bias as GlyphPainter1 is used for |
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// ltr text only. |
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retValue--; |
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} |
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biasReturn[0] = Position.Bias.Forward; |
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return retValue; |
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} |
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/** |
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* Determines the best location (in the model) to break |
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* the given view. |
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* This method attempts to break on a whitespace |
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* location. If a whitespace location can't be found, the |
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* nearest character location is returned. |
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* |
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* @param v the view |
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* @param p0 the location in the model where the |
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* fragment should start its representation >= 0 |
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* @param pos the graphic location along the axis that the |
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* broken view would occupy >= 0; this may be useful for |
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* things like tab calculations |
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* @param len specifies the distance into the view |
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* where a potential break is desired >= 0 |
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* @return the model location desired for a break |
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* @see View#breakView |
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*/ |
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public int getBoundedPosition(GlyphView v, int p0, float x, float len) { |
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sync(v); |
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TabExpander expander = v.getTabExpander(); |
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Segment s = v.getText(p0, v.getEndOffset()); |
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int[] justificationData = getJustificationData(v); |
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int index = Utilities.getTabbedTextOffset(v, s, metrics, x, (x+len), |
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expander, p0, false, |
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justificationData, true); |
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SegmentCache.releaseSharedSegment(s); |
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int p1 = p0 + index; |
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return p1; |
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} |
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@SuppressWarnings("deprecation") |
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void sync(GlyphView v) { |
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Font f = v.getFont(); |
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if ((metrics == null) || (! f.equals(metrics.getFont()))) { |
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// fetch a new FontMetrics |
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Container c = v.getContainer(); |
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metrics = (c != null) ? c.getFontMetrics(f) : |
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Toolkit.getDefaultToolkit().getFontMetrics(f); |
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} |
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} |
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/** |
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* @return justificationData from the ParagraphRow this GlyphView |
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* is in or {@code null} if no justification is needed |
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*/ |
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private int[] getJustificationData(GlyphView v) { |
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View parent = v.getParent(); |
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int [] ret = null; |
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if (parent instanceof ParagraphView.Row) { |
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ParagraphView.Row row = ((ParagraphView.Row) parent); |
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ret = row.justificationData; |
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} |
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return ret; |
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} |
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// --- variables --------------------------------------------- |
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FontMetrics metrics; |
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} |