- /*
- * @(#)GlyphPainter1.java 1.13 03/01/23
- *
- * Copyright 2003 Sun Microsystems, Inc. All rights reserved.
- * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
- */
- package javax.swing.text;
-
- import java.awt.*;
-
- /**
- * A class to perform rendering of the glyphs.
- * This can be implemented to be stateless, or
- * to hold some information as a cache to
- * facilitate faster rendering and model/view
- * translation. At a minimum, the GlyphPainter
- * allows a View implementation to perform its
- * duties independent of a particular version
- * of JVM and selection of capabilities (i.e.
- * shaping for i18n, etc).
- * <p>
- * This implementation is intended for operation
- * under the JDK1.1 API of the Java Platform.
- * Since the Java 2 SDK is backward compatible with
- * JDK1.1 API, this class will also function on
- * Java 2. The Java 2 SDK introduces improved
- * API for rendering text however, so the GlyphPainter2
- * is recommended for the Java 2 SDK.
- *
- * @author Timothy Prinzing
- * @version 1.13 01/23/03
- * @see GlyphView
- */
- class GlyphPainter1 extends GlyphView.GlyphPainter {
-
- /**
- * Determine the span the glyphs given a start location
- * (for tab expansion).
- */
- public float getSpan(GlyphView v, int p0, int p1,
- TabExpander e, float x) {
- sync(v);
- Segment text = v.getText(p0, p1);
- int width = Utilities.getTabbedTextWidth(text, metrics, (int) x, e, p0);
- SegmentCache.releaseSharedSegment(text);
- return width;
- }
-
- public float getHeight(GlyphView v) {
- sync(v);
- return metrics.getHeight();
- }
-
- /**
- * Fetches the ascent above the baseline for the glyphs
- * corresponding to the given range in the model.
- */
- public float getAscent(GlyphView v) {
- sync(v);
- return metrics.getAscent();
- }
-
- /**
- * Fetches the descent below the baseline for the glyphs
- * corresponding to the given range in the model.
- */
- public float getDescent(GlyphView v) {
- sync(v);
- return metrics.getDescent();
- }
-
- /**
- * Paints the glyphs representing the given range.
- */
- public void paint(GlyphView v, Graphics g, Shape a, int p0, int p1) {
- sync(v);
- Segment text;
- TabExpander expander = v.getTabExpander();
- Rectangle alloc = (a instanceof Rectangle) ? (Rectangle)a : a.getBounds();
-
- // determine the x coordinate to render the glyphs
- int x = alloc.x;
- int p = v.getStartOffset();
- if (p != p0) {
- text = v.getText(p, p0);
- int width = Utilities.getTabbedTextWidth(text, metrics, x, expander, p);
- x += width;
- SegmentCache.releaseSharedSegment(text);
- }
-
- // determine the y coordinate to render the glyphs
- int y = alloc.y + metrics.getHeight() - metrics.getDescent();
-
- // render the glyphs
- text = v.getText(p0, p1);
- g.setFont(metrics.getFont());
- Utilities.drawTabbedText(text, x, y, g, expander, p0);
- SegmentCache.releaseSharedSegment(text);
- }
-
- public Shape modelToView(GlyphView v, int pos, Position.Bias bias,
- Shape a) throws BadLocationException {
-
- sync(v);
- Rectangle alloc = (a instanceof Rectangle) ? (Rectangle)a : a.getBounds();
- int p0 = v.getStartOffset();
- int p1 = v.getEndOffset();
- TabExpander expander = v.getTabExpander();
- Segment text;
-
- if(pos == p1) {
- // The caller of this is left to right and borders a right to
- // left view, return our end location.
- return new Rectangle(alloc.x + alloc.width, alloc.y, 0,
- metrics.getHeight());
- }
- if ((pos >= p0) && (pos <= p1)) {
- // determine range to the left of the position
- text = v.getText(p0, pos);
- int width = Utilities.getTabbedTextWidth(text, metrics, alloc.x, expander, p0);
- SegmentCache.releaseSharedSegment(text);
- return new Rectangle(alloc.x + width, alloc.y, 0, metrics.getHeight());
- }
- throw new BadLocationException("modelToView - can't convert", p1);
- }
-
- /**
- * Provides a mapping from the view coordinate space to the logical
- * coordinate space of the model.
- *
- * @param v the view containing the view coordinates
- * @param x the X coordinate
- * @param y the Y coordinate
- * @param a the allocated region to render into
- * @param biasReturn always returns <code>Position.Bias.Forward</code>
- * as the zero-th element of this array
- * @return the location within the model that best represents the
- * given point in the view
- * @see View#viewToModel
- */
- public int viewToModel(GlyphView v, float x, float y, Shape a,
- Position.Bias[] biasReturn) {
-
- sync(v);
- Rectangle alloc = (a instanceof Rectangle) ? (Rectangle)a : a.getBounds();
- int p0 = v.getStartOffset();
- int p1 = v.getEndOffset();
- TabExpander expander = v.getTabExpander();
- Segment text = v.getText(p0, p1);
-
- int offs = Utilities.getTabbedTextOffset(text, metrics,
- alloc.x, (int) x, expander, p0);
- SegmentCache.releaseSharedSegment(text);
- int retValue = p0 + offs;
- if(retValue == p1) {
- // No need to return backward bias as GlyphPainter1 is used for
- // ltr text only.
- retValue--;
- }
- biasReturn[0] = Position.Bias.Forward;
- return retValue;
- }
-
- /**
- * Determines the best location (in the model) to break
- * the given view.
- * This method attempts to break on a whitespace
- * location. If a whitespace location can't be found, the
- * nearest character location is returned.
- *
- * @param v the view
- * @param p0 the location in the model where the
- * fragment should start its representation >= 0
- * @param pos the graphic location along the axis that the
- * broken view would occupy >= 0; this may be useful for
- * things like tab calculations
- * @param len specifies the distance into the view
- * where a potential break is desired >= 0
- * @return the model location desired for a break
- * @see View#breakView
- */
- public int getBoundedPosition(GlyphView v, int p0, float x, float len) {
- sync(v);
- TabExpander expander = v.getTabExpander();
- Segment s = v.getText(p0, v.getEndOffset());
- int index = Utilities.getTabbedTextOffset(s, metrics, (int)x, (int)(x+len),
- expander, p0, false);
- SegmentCache.releaseSharedSegment(s);
- int p1 = p0 + index;
- return p1;
- }
-
- void sync(GlyphView v) {
- Font f = v.getFont();
- if ((metrics == null) || (! f.equals(metrics.getFont()))) {
- // fetch a new FontMetrics
- Toolkit kit;
- Component c = v.getContainer();
- if (c != null) {
- kit = c.getToolkit();
- } else {
- kit = Toolkit.getDefaultToolkit();
- }
- metrics = kit.getFontMetrics(f);
- }
- }
-
- // --- variables ---------------------------------------------
-
- FontMetrics metrics;
- }