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385 lines
14 KiB
385 lines
14 KiB
/*
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* Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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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()) {
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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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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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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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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 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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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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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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if(pos == endOffset) {
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// A move to the left from an internal position will
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// only take us to the endOffset in a right to left 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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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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default:
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throw new IllegalArgumentException("Bad direction: " + direction);
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}
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return pos;
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}
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// --- variables ---------------------------------------------
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TextLayout layout;
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}
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