author | malenkov |
Wed, 30 Apr 2014 19:28:05 +0400 | |
changeset 24544 | c0133e7c7162 |
parent 23010 | 6dadb192ad81 |
permissions | -rw-r--r-- |
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/* |
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6dadb192ad81
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changeset
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* Copyright (c) 1999, 2013, 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.text.*; |
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import java.awt.*; |
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import java.awt.font.*; |
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import java.awt.geom.Rectangle2D; |
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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 JDK. It uses the |
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* java.awt.font.TextLayout class to do i18n capable |
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* rendering. |
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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 GlyphPainter2 extends GlyphView.GlyphPainter { |
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public GlyphPainter2(TextLayout layout) { |
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this.layout = layout; |
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} |
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/** |
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* Create a painter to use for the given GlyphView. |
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*/ |
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public GlyphView.GlyphPainter getPainter(GlyphView v, int p0, int p1) { |
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return null; |
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} |
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/** |
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* Determine the span the glyphs given a start location |
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* (for tab expansion). This implementation assumes it |
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* has no tabs (i.e. TextLayout doesn't deal with tab |
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* 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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if ((p0 == v.getStartOffset()) && (p1 == v.getEndOffset())) { |
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return layout.getAdvance(); |
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} |
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int p = v.getStartOffset(); |
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int index0 = p0 - p; |
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int index1 = p1 - p; |
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TextHitInfo hit0 = TextHitInfo.afterOffset(index0); |
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TextHitInfo hit1 = TextHitInfo.beforeOffset(index1); |
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float[] locs = layout.getCaretInfo(hit0); |
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float x0 = locs[0]; |
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locs = layout.getCaretInfo(hit1); |
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float x1 = locs[0]; |
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return (x1 > x0) ? x1 - x0 : x0 - x1; |
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} |
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public float getHeight(GlyphView v) { |
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return layout.getAscent() + layout.getDescent() + layout.getLeading(); |
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} |
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/** |
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* Fetch 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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return layout.getAscent(); |
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} |
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/** |
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* Fetch 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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return layout.getDescent(); |
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} |
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/** |
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* Paint the glyphs for the given view. This is implemented |
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* to only render if the Graphics is of type Graphics2D which |
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* is required by TextLayout (and this should be the case if |
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* running on the JDK). |
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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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if (g instanceof Graphics2D) { |
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Rectangle2D alloc = a.getBounds2D(); |
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Graphics2D g2d = (Graphics2D)g; |
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float y = (float) alloc.getY() + layout.getAscent() + layout.getLeading(); |
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float x = (float) alloc.getX(); |
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if( p0 > v.getStartOffset() || p1 < v.getEndOffset() ) { |
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try { |
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//TextLayout can't render only part of it's range, so if a |
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//partial range is required, add a clip region. |
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Shape s = v.modelToView(p0, Position.Bias.Forward, |
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p1, Position.Bias.Backward, a); |
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Shape savedClip = g.getClip(); |
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g2d.clip(s); |
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layout.draw(g2d, x, y); |
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g.setClip(savedClip); |
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} catch (BadLocationException e) {} |
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} else { |
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layout.draw(g2d, x, y); |
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} |
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} |
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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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int offs = pos - v.getStartOffset(); |
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Rectangle2D alloc = a.getBounds2D(); |
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TextHitInfo hit = (bias == Position.Bias.Forward) ? |
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TextHitInfo.afterOffset(offs) : TextHitInfo.beforeOffset(offs); |
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float[] locs = layout.getCaretInfo(hit); |
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// vertical at the baseline, should use slope and check if glyphs |
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// are being rendered vertically. |
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alloc.setRect(alloc.getX() + locs[0], alloc.getY(), 1, alloc.getHeight()); |
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return alloc; |
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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 either <code>Position.Bias.Forward</code> |
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* or <code>Position.Bias.Backward</code> is returned as the |
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* 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 of 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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Rectangle2D alloc = (a instanceof Rectangle2D) ? (Rectangle2D)a : a.getBounds2D(); |
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//Move the y co-ord of the hit onto the baseline. This is because TextLayout supports |
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//italic carets and we do not. |
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TextHitInfo hit = layout.hitTestChar(x - (float)alloc.getX(), 0); |
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int pos = hit.getInsertionIndex(); |
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if (pos == v.getEndOffset()) { |
d102bd3f513c
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pos--; |
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} |
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biasReturn[0] = hit.isLeadingEdge() ? Position.Bias.Forward : Position.Bias.Backward; |
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return pos + v.getStartOffset(); |
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} |
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/** |
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* Determines the model location that represents the |
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* maximum advance that fits within the given span. |
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* This could be used to break the given view. The result |
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* should be a location just shy of the given advance. This |
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* differs from viewToModel which returns the closest |
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* position which might be proud of the maximum advance. |
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* |
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* @param v the view to find the model location to break at. |
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* @param p0 the location in the model where the |
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* fragment should start it's 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 maximum model location possible 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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if( len < 0 ) |
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throw new IllegalArgumentException("Length must be >= 0."); |
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// note: this only works because swing uses TextLayouts that are |
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// only pure rtl or pure ltr |
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TextHitInfo hit; |
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if (layout.isLeftToRight()) { |
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hit = layout.hitTestChar(len, 0); |
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} else { |
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hit = layout.hitTestChar(layout.getAdvance() - len, 0); |
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} |
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return v.getStartOffset() + hit.getCharIndex(); |
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} |
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/** |
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* Provides a way to determine the next visually represented model |
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* location that one might place a caret. Some views may not be |
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* visible, they might not be in the same order found in the model, or |
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* they just might not allow access to some of the locations in the |
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* model. |
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* |
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* @param v the view to use |
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* @param pos the position to convert >= 0 |
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* @param a the allocated region to render into |
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* @param direction the direction from the current position that can |
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* be thought of as the arrow keys typically found on a keyboard. |
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* This may be SwingConstants.WEST, SwingConstants.EAST, |
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* SwingConstants.NORTH, or SwingConstants.SOUTH. |
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* @return the location within the model that best represents the next |
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* location visual position. |
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* @exception BadLocationException |
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* @exception IllegalArgumentException for an invalid direction |
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*/ |
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public int getNextVisualPositionFrom(GlyphView v, int pos, |
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Position.Bias b, Shape a, |
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int direction, |
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Position.Bias[] biasRet) |
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throws BadLocationException { |
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Document doc = v.getDocument(); |
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int startOffset = v.getStartOffset(); |
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int endOffset = v.getEndOffset(); |
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Segment text; |
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boolean viewIsLeftToRight; |
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TextHitInfo currentHit, nextHit; |
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switch (direction) { |
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case View.NORTH: |
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break; |
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case View.SOUTH: |
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break; |
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case View.EAST: |
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viewIsLeftToRight = AbstractDocument.isLeftToRight(doc, startOffset, endOffset); |
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if(startOffset == doc.getLength()) { |
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if(pos == -1) { |
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biasRet[0] = Position.Bias.Forward; |
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return startOffset; |
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} |
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// End case for bidi text where newline is at beginning |
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// of line. |
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return -1; |
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} |
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if(pos == -1) { |
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// Entering view from the left. |
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if( viewIsLeftToRight ) { |
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biasRet[0] = Position.Bias.Forward; |
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return startOffset; |
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} else { |
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text = v.getText(endOffset - 1, endOffset); |
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char c = text.array[text.offset]; |
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SegmentCache.releaseSharedSegment(text); |
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if(c == '\n') { |
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biasRet[0] = Position.Bias.Forward; |
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return endOffset-1; |
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} |
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biasRet[0] = Position.Bias.Backward; |
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return endOffset; |
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} |
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} |
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if( b==Position.Bias.Forward ) |
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currentHit = TextHitInfo.afterOffset(pos-startOffset); |
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else |
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currentHit = TextHitInfo.beforeOffset(pos-startOffset); |
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nextHit = layout.getNextRightHit(currentHit); |
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if( nextHit == null ) { |
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return -1; |
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} |
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if( viewIsLeftToRight != layout.isLeftToRight() ) { |
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// If the layout's base direction is different from |
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// this view's run direction, we need to use the weak |
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// carrat. |
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nextHit = layout.getVisualOtherHit(nextHit); |
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} |
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pos = nextHit.getInsertionIndex() + startOffset; |
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299 |
if(pos == endOffset) { |
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// A move to the right from an internal position will |
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// only take us to the endOffset in a left to right run. |
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text = v.getText(endOffset - 1, endOffset); |
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char c = text.array[text.offset]; |
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SegmentCache.releaseSharedSegment(text); |
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305 |
if(c == '\n') { |
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return -1; |
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} |
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biasRet[0] = Position.Bias.Backward; |
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} |
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else { |
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biasRet[0] = Position.Bias.Forward; |
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} |
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return pos; |
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case View.WEST: |
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changeset
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viewIsLeftToRight = AbstractDocument.isLeftToRight(doc, startOffset, endOffset); |
2 | 316 |
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317 |
if(startOffset == doc.getLength()) { |
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318 |
if(pos == -1) { |
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biasRet[0] = Position.Bias.Forward; |
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return startOffset; |
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321 |
} |
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// End case for bidi text where newline is at beginning |
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// of line. |
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return -1; |
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} |
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if(pos == -1) { |
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// Entering view from the right |
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if( viewIsLeftToRight ) { |
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text = v.getText(endOffset - 1, endOffset); |
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char c = text.array[text.offset]; |
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SegmentCache.releaseSharedSegment(text); |
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if ((c == '\n') || Character.isSpaceChar(c)) { |
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biasRet[0] = Position.Bias.Forward; |
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return endOffset - 1; |
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} |
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biasRet[0] = Position.Bias.Backward; |
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return endOffset; |
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} else { |
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biasRet[0] = Position.Bias.Forward; |
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return startOffset; |
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} |
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} |
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343 |
if( b==Position.Bias.Forward ) |
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currentHit = TextHitInfo.afterOffset(pos-startOffset); |
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else |
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currentHit = TextHitInfo.beforeOffset(pos-startOffset); |
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nextHit = layout.getNextLeftHit(currentHit); |
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348 |
if( nextHit == null ) { |
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return -1; |
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350 |
} |
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351 |
if( viewIsLeftToRight != layout.isLeftToRight() ) { |
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// If the layout's base direction is different from |
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// this view's run direction, we need to use the weak |
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// carrat. |
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nextHit = layout.getVisualOtherHit(nextHit); |
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356 |
} |
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pos = nextHit.getInsertionIndex() + startOffset; |
|
358 |
||
359 |
if(pos == endOffset) { |
|
360 |
// A move to the left from an internal position will |
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361 |
// only take us to the endOffset in a right to left run. |
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362 |
text = v.getText(endOffset - 1, endOffset); |
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char c = text.array[text.offset]; |
|
364 |
SegmentCache.releaseSharedSegment(text); |
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365 |
if(c == '\n') { |
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366 |
return -1; |
|
367 |
} |
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biasRet[0] = Position.Bias.Backward; |
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} |
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else { |
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371 |
biasRet[0] = Position.Bias.Forward; |
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372 |
} |
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return pos; |
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374 |
default: |
|
375 |
throw new IllegalArgumentException("Bad direction: " + direction); |
|
376 |
} |
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377 |
return pos; |
|
378 |
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379 |
} |
|
380 |
// --- variables --------------------------------------------- |
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381 |
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382 |
TextLayout layout; |
|
383 |
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384 |
} |