| /* |
| * Copyright (c) 1998, 2011, 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; |
| |
| import java.awt.*; |
| import java.lang.ref.SoftReference; |
| import javax.swing.event.*; |
| |
| /** |
| * View of plain text (text with only one font and color) |
| * that does line-wrapping. This view expects that its |
| * associated element has child elements that represent |
| * the lines it should be wrapping. It is implemented |
| * as a vertical box that contains logical line views. |
| * The logical line views are nested classes that render |
| * the logical line as multiple physical line if the logical |
| * line is too wide to fit within the allocation. The |
| * line views draw upon the outer class for its state |
| * to reduce their memory requirements. |
| * <p> |
| * The line views do all of their rendering through the |
| * <code>drawLine</code> method which in turn does all of |
| * its rendering through the <code>drawSelectedText</code> |
| * and <code>drawUnselectedText</code> methods. This |
| * enables subclasses to easily specialize the rendering |
| * without concern for the layout aspects. |
| * |
| * @author Timothy Prinzing |
| * @see View |
| */ |
| public class WrappedPlainView extends BoxView implements TabExpander { |
| |
| /** |
| * Creates a new WrappedPlainView. Lines will be wrapped |
| * on character boundaries. |
| * |
| * @param elem the element underlying the view |
| */ |
| public WrappedPlainView(Element elem) { |
| this(elem, false); |
| } |
| |
| /** |
| * Creates a new WrappedPlainView. Lines can be wrapped on |
| * either character or word boundaries depending upon the |
| * setting of the wordWrap parameter. |
| * |
| * @param elem the element underlying the view |
| * @param wordWrap should lines be wrapped on word boundaries? |
| */ |
| public WrappedPlainView(Element elem, boolean wordWrap) { |
| super(elem, Y_AXIS); |
| this.wordWrap = wordWrap; |
| } |
| |
| /** |
| * Returns the tab size set for the document, defaulting to 8. |
| * |
| * @return the tab size |
| */ |
| protected int getTabSize() { |
| Integer i = (Integer) getDocument().getProperty(PlainDocument.tabSizeAttribute); |
| int size = (i != null) ? i.intValue() : 8; |
| return size; |
| } |
| |
| /** |
| * Renders a line of text, suppressing whitespace at the end |
| * and expanding any tabs. This is implemented to make calls |
| * to the methods <code>drawUnselectedText</code> and |
| * <code>drawSelectedText</code> so that the way selected and |
| * unselected text are rendered can be customized. |
| * |
| * @param p0 the starting document location to use >= 0 |
| * @param p1 the ending document location to use >= p1 |
| * @param g the graphics context |
| * @param x the starting X position >= 0 |
| * @param y the starting Y position >= 0 |
| * @see #drawUnselectedText |
| * @see #drawSelectedText |
| */ |
| protected void drawLine(int p0, int p1, Graphics g, int x, int y) { |
| Element lineMap = getElement(); |
| Element line = lineMap.getElement(lineMap.getElementIndex(p0)); |
| Element elem; |
| |
| try { |
| if (line.isLeaf()) { |
| drawText(line, p0, p1, g, x, y); |
| } else { |
| // this line contains the composed text. |
| int idx = line.getElementIndex(p0); |
| int lastIdx = line.getElementIndex(p1); |
| for(; idx <= lastIdx; idx++) { |
| elem = line.getElement(idx); |
| int start = Math.max(elem.getStartOffset(), p0); |
| int end = Math.min(elem.getEndOffset(), p1); |
| x = drawText(elem, start, end, g, x, y); |
| } |
| } |
| } catch (BadLocationException e) { |
| throw new StateInvariantError("Can't render: " + p0 + "," + p1); |
| } |
| } |
| |
| private int drawText(Element elem, int p0, int p1, Graphics g, int x, int y) throws BadLocationException { |
| p1 = Math.min(getDocument().getLength(), p1); |
| AttributeSet attr = elem.getAttributes(); |
| |
| if (Utilities.isComposedTextAttributeDefined(attr)) { |
| g.setColor(unselected); |
| x = Utilities.drawComposedText(this, attr, g, x, y, |
| p0-elem.getStartOffset(), |
| p1-elem.getStartOffset()); |
| } else { |
| if (sel0 == sel1 || selected == unselected) { |
| // no selection, or it is invisible |
| x = drawUnselectedText(g, x, y, p0, p1); |
| } else if ((p0 >= sel0 && p0 <= sel1) && (p1 >= sel0 && p1 <= sel1)) { |
| x = drawSelectedText(g, x, y, p0, p1); |
| } else if (sel0 >= p0 && sel0 <= p1) { |
| if (sel1 >= p0 && sel1 <= p1) { |
| x = drawUnselectedText(g, x, y, p0, sel0); |
| x = drawSelectedText(g, x, y, sel0, sel1); |
| x = drawUnselectedText(g, x, y, sel1, p1); |
| } else { |
| x = drawUnselectedText(g, x, y, p0, sel0); |
| x = drawSelectedText(g, x, y, sel0, p1); |
| } |
| } else if (sel1 >= p0 && sel1 <= p1) { |
| x = drawSelectedText(g, x, y, p0, sel1); |
| x = drawUnselectedText(g, x, y, sel1, p1); |
| } else { |
| x = drawUnselectedText(g, x, y, p0, p1); |
| } |
| } |
| |
| return x; |
| } |
| |
| /** |
| * Renders the given range in the model as normal unselected |
| * text. |
| * |
| * @param g the graphics context |
| * @param x the starting X coordinate >= 0 |
| * @param y the starting Y coordinate >= 0 |
| * @param p0 the beginning position in the model >= 0 |
| * @param p1 the ending position in the model >= p0 |
| * @return the X location of the end of the range >= 0 |
| * @exception BadLocationException if the range is invalid |
| */ |
| protected int drawUnselectedText(Graphics g, int x, int y, |
| int p0, int p1) throws BadLocationException { |
| g.setColor(unselected); |
| Document doc = getDocument(); |
| Segment segment = SegmentCache.getSharedSegment(); |
| doc.getText(p0, p1 - p0, segment); |
| int ret = Utilities.drawTabbedText(this, segment, x, y, g, this, p0); |
| SegmentCache.releaseSharedSegment(segment); |
| return ret; |
| } |
| |
| /** |
| * Renders the given range in the model as selected text. This |
| * is implemented to render the text in the color specified in |
| * the hosting component. It assumes the highlighter will render |
| * the selected background. |
| * |
| * @param g the graphics context |
| * @param x the starting X coordinate >= 0 |
| * @param y the starting Y coordinate >= 0 |
| * @param p0 the beginning position in the model >= 0 |
| * @param p1 the ending position in the model >= p0 |
| * @return the location of the end of the range. |
| * @exception BadLocationException if the range is invalid |
| */ |
| protected int drawSelectedText(Graphics g, int x, |
| int y, int p0, int p1) throws BadLocationException { |
| g.setColor(selected); |
| Document doc = getDocument(); |
| Segment segment = SegmentCache.getSharedSegment(); |
| doc.getText(p0, p1 - p0, segment); |
| int ret = Utilities.drawTabbedText(this, segment, x, y, g, this, p0); |
| SegmentCache.releaseSharedSegment(segment); |
| return ret; |
| } |
| |
| /** |
| * Gives access to a buffer that can be used to fetch |
| * text from the associated document. |
| * |
| * @return the buffer |
| */ |
| protected final Segment getLineBuffer() { |
| if (lineBuffer == null) { |
| lineBuffer = new Segment(); |
| } |
| return lineBuffer; |
| } |
| |
| /** |
| * This is called by the nested wrapped line |
| * views to determine the break location. This can |
| * be reimplemented to alter the breaking behavior. |
| * It will either break at word or character boundaries |
| * depending upon the break argument given at |
| * construction. |
| */ |
| protected int calculateBreakPosition(int p0, int p1) { |
| int p; |
| Segment segment = SegmentCache.getSharedSegment(); |
| loadText(segment, p0, p1); |
| int currentWidth = getWidth(); |
| if (wordWrap) { |
| p = p0 + Utilities.getBreakLocation(segment, metrics, |
| tabBase, tabBase + currentWidth, |
| this, p0); |
| } else { |
| p = p0 + Utilities.getTabbedTextOffset(segment, metrics, |
| tabBase, tabBase + currentWidth, |
| this, p0, false); |
| } |
| SegmentCache.releaseSharedSegment(segment); |
| return p; |
| } |
| |
| /** |
| * Loads all of the children to initialize the view. |
| * This is called by the <code>setParent</code> method. |
| * Subclasses can reimplement this to initialize their |
| * child views in a different manner. The default |
| * implementation creates a child view for each |
| * child element. |
| * |
| * @param f the view factory |
| */ |
| protected void loadChildren(ViewFactory f) { |
| Element e = getElement(); |
| int n = e.getElementCount(); |
| if (n > 0) { |
| View[] added = new View[n]; |
| for (int i = 0; i < n; i++) { |
| added[i] = new WrappedLine(e.getElement(i)); |
| } |
| replace(0, 0, added); |
| } |
| } |
| |
| /** |
| * Update the child views in response to a |
| * document event. |
| */ |
| void updateChildren(DocumentEvent e, Shape a) { |
| Element elem = getElement(); |
| DocumentEvent.ElementChange ec = e.getChange(elem); |
| if (ec != null) { |
| // the structure of this element changed. |
| Element[] removedElems = ec.getChildrenRemoved(); |
| Element[] addedElems = ec.getChildrenAdded(); |
| View[] added = new View[addedElems.length]; |
| for (int i = 0; i < addedElems.length; i++) { |
| added[i] = new WrappedLine(addedElems[i]); |
| } |
| replace(ec.getIndex(), removedElems.length, added); |
| |
| // should damge a little more intelligently. |
| if (a != null) { |
| preferenceChanged(null, true, true); |
| getContainer().repaint(); |
| } |
| } |
| |
| // update font metrics which may be used by the child views |
| updateMetrics(); |
| } |
| |
| /** |
| * Load the text buffer with the given range |
| * of text. This is used by the fragments |
| * broken off of this view as well as this |
| * view itself. |
| */ |
| final void loadText(Segment segment, int p0, int p1) { |
| try { |
| Document doc = getDocument(); |
| doc.getText(p0, p1 - p0, segment); |
| } catch (BadLocationException bl) { |
| throw new StateInvariantError("Can't get line text"); |
| } |
| } |
| |
| final void updateMetrics() { |
| Component host = getContainer(); |
| Font f = host.getFont(); |
| metrics = host.getFontMetrics(f); |
| tabSize = getTabSize() * metrics.charWidth('m'); |
| } |
| |
| // --- TabExpander methods ------------------------------------------ |
| |
| /** |
| * Returns the next tab stop position after a given reference position. |
| * This implementation does not support things like centering so it |
| * ignores the tabOffset argument. |
| * |
| * @param x the current position >= 0 |
| * @param tabOffset the position within the text stream |
| * that the tab occurred at >= 0. |
| * @return the tab stop, measured in points >= 0 |
| */ |
| public float nextTabStop(float x, int tabOffset) { |
| if (tabSize == 0) |
| return x; |
| int ntabs = ((int) x - tabBase) / tabSize; |
| return tabBase + ((ntabs + 1) * tabSize); |
| } |
| |
| |
| // --- View methods ------------------------------------- |
| |
| /** |
| * Renders using the given rendering surface and area |
| * on that surface. This is implemented to stash the |
| * selection positions, selection colors, and font |
| * metrics for the nested lines to use. |
| * |
| * @param g the rendering surface to use |
| * @param a the allocated region to render into |
| * |
| * @see View#paint |
| */ |
| public void paint(Graphics g, Shape a) { |
| Rectangle alloc = (Rectangle) a; |
| tabBase = alloc.x; |
| JTextComponent host = (JTextComponent) getContainer(); |
| sel0 = host.getSelectionStart(); |
| sel1 = host.getSelectionEnd(); |
| unselected = (host.isEnabled()) ? |
| host.getForeground() : host.getDisabledTextColor(); |
| Caret c = host.getCaret(); |
| selected = c.isSelectionVisible() && host.getHighlighter() != null ? |
| host.getSelectedTextColor() : unselected; |
| g.setFont(host.getFont()); |
| |
| // superclass paints the children |
| super.paint(g, a); |
| } |
| |
| /** |
| * Sets the size of the view. This should cause |
| * layout of the view along the given axis, if it |
| * has any layout duties. |
| * |
| * @param width the width >= 0 |
| * @param height the height >= 0 |
| */ |
| public void setSize(float width, float height) { |
| updateMetrics(); |
| if ((int) width != getWidth()) { |
| // invalidate the view itself since the childrens |
| // desired widths will be based upon this views width. |
| preferenceChanged(null, true, true); |
| widthChanging = true; |
| } |
| super.setSize(width, height); |
| widthChanging = false; |
| } |
| |
| /** |
| * Determines the preferred span for this view along an |
| * axis. This is implemented to provide the superclass |
| * behavior after first making sure that the current font |
| * metrics are cached (for the nested lines which use |
| * the metrics to determine the height of the potentially |
| * wrapped lines). |
| * |
| * @param axis may be either View.X_AXIS or View.Y_AXIS |
| * @return the span the view would like to be rendered into. |
| * Typically the view is told to render into the span |
| * that is returned, although there is no guarantee. |
| * The parent may choose to resize or break the view. |
| * @see View#getPreferredSpan |
| */ |
| public float getPreferredSpan(int axis) { |
| updateMetrics(); |
| return super.getPreferredSpan(axis); |
| } |
| |
| /** |
| * Determines the minimum span for this view along an |
| * axis. This is implemented to provide the superclass |
| * behavior after first making sure that the current font |
| * metrics are cached (for the nested lines which use |
| * the metrics to determine the height of the potentially |
| * wrapped lines). |
| * |
| * @param axis may be either View.X_AXIS or View.Y_AXIS |
| * @return the span the view would like to be rendered into. |
| * Typically the view is told to render into the span |
| * that is returned, although there is no guarantee. |
| * The parent may choose to resize or break the view. |
| * @see View#getMinimumSpan |
| */ |
| public float getMinimumSpan(int axis) { |
| updateMetrics(); |
| return super.getMinimumSpan(axis); |
| } |
| |
| /** |
| * Determines the maximum span for this view along an |
| * axis. This is implemented to provide the superclass |
| * behavior after first making sure that the current font |
| * metrics are cached (for the nested lines which use |
| * the metrics to determine the height of the potentially |
| * wrapped lines). |
| * |
| * @param axis may be either View.X_AXIS or View.Y_AXIS |
| * @return the span the view would like to be rendered into. |
| * Typically the view is told to render into the span |
| * that is returned, although there is no guarantee. |
| * The parent may choose to resize or break the view. |
| * @see View#getMaximumSpan |
| */ |
| public float getMaximumSpan(int axis) { |
| updateMetrics(); |
| return super.getMaximumSpan(axis); |
| } |
| |
| /** |
| * Gives notification that something was inserted into the |
| * document in a location that this view is responsible for. |
| * This is implemented to simply update the children. |
| * |
| * @param e the change information from the associated document |
| * @param a the current allocation of the view |
| * @param f the factory to use to rebuild if the view has children |
| * @see View#insertUpdate |
| */ |
| public void insertUpdate(DocumentEvent e, Shape a, ViewFactory f) { |
| updateChildren(e, a); |
| |
| Rectangle alloc = ((a != null) && isAllocationValid()) ? |
| getInsideAllocation(a) : null; |
| int pos = e.getOffset(); |
| View v = getViewAtPosition(pos, alloc); |
| if (v != null) { |
| v.insertUpdate(e, alloc, f); |
| } |
| } |
| |
| /** |
| * Gives notification that something was removed from the |
| * document in a location that this view is responsible for. |
| * This is implemented to simply update the children. |
| * |
| * @param e the change information from the associated document |
| * @param a the current allocation of the view |
| * @param f the factory to use to rebuild if the view has children |
| * @see View#removeUpdate |
| */ |
| public void removeUpdate(DocumentEvent e, Shape a, ViewFactory f) { |
| updateChildren(e, a); |
| |
| Rectangle alloc = ((a != null) && isAllocationValid()) ? |
| getInsideAllocation(a) : null; |
| int pos = e.getOffset(); |
| View v = getViewAtPosition(pos, alloc); |
| if (v != null) { |
| v.removeUpdate(e, alloc, f); |
| } |
| } |
| |
| /** |
| * Gives notification from the document that attributes were changed |
| * in a location that this view is responsible for. |
| * |
| * @param e the change information from the associated document |
| * @param a the current allocation of the view |
| * @param f the factory to use to rebuild if the view has children |
| * @see View#changedUpdate |
| */ |
| public void changedUpdate(DocumentEvent e, Shape a, ViewFactory f) { |
| updateChildren(e, a); |
| } |
| |
| // --- variables ------------------------------------------- |
| |
| FontMetrics metrics; |
| Segment lineBuffer; |
| boolean widthChanging; |
| int tabBase; |
| int tabSize; |
| boolean wordWrap; |
| |
| int sel0; |
| int sel1; |
| Color unselected; |
| Color selected; |
| |
| |
| /** |
| * Simple view of a line that wraps if it doesn't |
| * fit withing the horizontal space allocated. |
| * This class tries to be lightweight by carrying little |
| * state of it's own and sharing the state of the outer class |
| * with it's sibblings. |
| */ |
| class WrappedLine extends View { |
| |
| WrappedLine(Element elem) { |
| super(elem); |
| lineCount = -1; |
| } |
| |
| /** |
| * Determines the preferred span for this view along an |
| * axis. |
| * |
| * @param axis may be either X_AXIS or Y_AXIS |
| * @return the span the view would like to be rendered into. |
| * Typically the view is told to render into the span |
| * that is returned, although there is no guarantee. |
| * The parent may choose to resize or break the view. |
| * @see View#getPreferredSpan |
| */ |
| public float getPreferredSpan(int axis) { |
| switch (axis) { |
| case View.X_AXIS: |
| float width = getWidth(); |
| if (width == Integer.MAX_VALUE) { |
| // We have been initially set to MAX_VALUE, but we don't |
| // want this as our preferred. |
| return 100f; |
| } |
| return width; |
| case View.Y_AXIS: |
| if (lineCount < 0 || widthChanging) { |
| breakLines(getStartOffset()); |
| } |
| return lineCount * metrics.getHeight(); |
| default: |
| throw new IllegalArgumentException("Invalid axis: " + axis); |
| } |
| } |
| |
| /** |
| * Renders using the given rendering surface and area on that |
| * surface. The view may need to do layout and create child |
| * views to enable itself to render into the given allocation. |
| * |
| * @param g the rendering surface to use |
| * @param a the allocated region to render into |
| * @see View#paint |
| */ |
| public void paint(Graphics g, Shape a) { |
| Rectangle alloc = (Rectangle) a; |
| int y = alloc.y + metrics.getAscent(); |
| int x = alloc.x; |
| |
| JTextComponent host = (JTextComponent)getContainer(); |
| Highlighter h = host.getHighlighter(); |
| LayeredHighlighter dh = (h instanceof LayeredHighlighter) ? |
| (LayeredHighlighter)h : null; |
| |
| int start = getStartOffset(); |
| int end = getEndOffset(); |
| int p0 = start; |
| int[] lineEnds = getLineEnds(); |
| for (int i = 0; i < lineCount; i++) { |
| int p1 = (lineEnds == null) ? end : |
| start + lineEnds[i]; |
| if (dh != null) { |
| int hOffset = (p1 == end) |
| ? (p1 - 1) |
| : p1; |
| dh.paintLayeredHighlights(g, p0, hOffset, a, host, this); |
| } |
| drawLine(p0, p1, g, x, y); |
| |
| p0 = p1; |
| y += metrics.getHeight(); |
| } |
| } |
| |
| /** |
| * Provides a mapping from the document model coordinate space |
| * to the coordinate space of the view mapped to it. |
| * |
| * @param pos the position to convert |
| * @param a the allocated region to render into |
| * @return the bounding box of the given position is returned |
| * @exception BadLocationException if the given position does not represent a |
| * valid location in the associated document |
| * @see View#modelToView |
| */ |
| public Shape modelToView(int pos, Shape a, Position.Bias b) |
| throws BadLocationException { |
| Rectangle alloc = a.getBounds(); |
| alloc.height = metrics.getHeight(); |
| alloc.width = 1; |
| |
| int p0 = getStartOffset(); |
| if (pos < p0 || pos > getEndOffset()) { |
| throw new BadLocationException("Position out of range", pos); |
| } |
| |
| int testP = (b == Position.Bias.Forward) ? pos : |
| Math.max(p0, pos - 1); |
| int line = 0; |
| int[] lineEnds = getLineEnds(); |
| if (lineEnds != null) { |
| line = findLine(testP - p0); |
| if (line > 0) { |
| p0 += lineEnds[line - 1]; |
| } |
| alloc.y += alloc.height * line; |
| } |
| |
| if (pos > p0) { |
| Segment segment = SegmentCache.getSharedSegment(); |
| loadText(segment, p0, pos); |
| alloc.x += Utilities.getTabbedTextWidth(segment, metrics, |
| alloc.x, WrappedPlainView.this, p0); |
| SegmentCache.releaseSharedSegment(segment); |
| } |
| return alloc; |
| } |
| |
| /** |
| * Provides a mapping from the view coordinate space to the logical |
| * coordinate space of the model. |
| * |
| * @param fx the X coordinate |
| * @param fy the Y coordinate |
| * @param a the allocated region to render into |
| * @return the location within the model that best represents the |
| * given point in the view |
| * @see View#viewToModel |
| */ |
| public int viewToModel(float fx, float fy, Shape a, Position.Bias[] bias) { |
| // PENDING(prinz) implement bias properly |
| bias[0] = Position.Bias.Forward; |
| |
| Rectangle alloc = (Rectangle) a; |
| int x = (int) fx; |
| int y = (int) fy; |
| if (y < alloc.y) { |
| // above the area covered by this icon, so the the position |
| // is assumed to be the start of the coverage for this view. |
| return getStartOffset(); |
| } else if (y > alloc.y + alloc.height) { |
| // below the area covered by this icon, so the the position |
| // is assumed to be the end of the coverage for this view. |
| return getEndOffset() - 1; |
| } else { |
| // positioned within the coverage of this view vertically, |
| // so we figure out which line the point corresponds to. |
| // if the line is greater than the number of lines contained, then |
| // simply use the last line as it represents the last possible place |
| // we can position to. |
| alloc.height = metrics.getHeight(); |
| int line = (alloc.height > 0 ? |
| (y - alloc.y) / alloc.height : lineCount - 1); |
| if (line >= lineCount) { |
| return getEndOffset() - 1; |
| } else { |
| int p0 = getStartOffset(); |
| int p1; |
| if (lineCount == 1) { |
| p1 = getEndOffset(); |
| } else { |
| int[] lineEnds = getLineEnds(); |
| p1 = p0 + lineEnds[line]; |
| if (line > 0) { |
| p0 += lineEnds[line - 1]; |
| } |
| } |
| |
| if (x < alloc.x) { |
| // point is to the left of the line |
| return p0; |
| } else if (x > alloc.x + alloc.width) { |
| // point is to the right of the line |
| return p1 - 1; |
| } else { |
| // Determine the offset into the text |
| Segment segment = SegmentCache.getSharedSegment(); |
| loadText(segment, p0, p1); |
| int n = Utilities.getTabbedTextOffset(segment, metrics, |
| alloc.x, x, |
| WrappedPlainView.this, p0); |
| SegmentCache.releaseSharedSegment(segment); |
| return Math.min(p0 + n, p1 - 1); |
| } |
| } |
| } |
| } |
| |
| public void insertUpdate(DocumentEvent e, Shape a, ViewFactory f) { |
| update(e, a); |
| } |
| |
| public void removeUpdate(DocumentEvent e, Shape a, ViewFactory f) { |
| update(e, a); |
| } |
| |
| private void update(DocumentEvent ev, Shape a) { |
| int oldCount = lineCount; |
| breakLines(ev.getOffset()); |
| if (oldCount != lineCount) { |
| WrappedPlainView.this.preferenceChanged(this, false, true); |
| // have to repaint any views after the receiver. |
| getContainer().repaint(); |
| } else if (a != null) { |
| Component c = getContainer(); |
| Rectangle alloc = (Rectangle) a; |
| c.repaint(alloc.x, alloc.y, alloc.width, alloc.height); |
| } |
| } |
| |
| /** |
| * Returns line cache. If the cache was GC'ed, recreates it. |
| * If there's no cache, returns null |
| */ |
| final int[] getLineEnds() { |
| if (lineCache == null) { |
| return null; |
| } else { |
| int[] lineEnds = lineCache.get(); |
| if (lineEnds == null) { |
| // Cache was GC'ed, so rebuild it |
| return breakLines(getStartOffset()); |
| } else { |
| return lineEnds; |
| } |
| } |
| } |
| |
| /** |
| * Creates line cache if text breaks into more than one physical line. |
| * @param startPos position to start breaking from |
| * @return the cache created, ot null if text breaks into one line |
| */ |
| final int[] breakLines(int startPos) { |
| int[] lineEnds = (lineCache == null) ? null : lineCache.get(); |
| int[] oldLineEnds = lineEnds; |
| int start = getStartOffset(); |
| int lineIndex = 0; |
| if (lineEnds != null) { |
| lineIndex = findLine(startPos - start); |
| if (lineIndex > 0) { |
| lineIndex--; |
| } |
| } |
| |
| int p0 = (lineIndex == 0) ? start : start + lineEnds[lineIndex - 1]; |
| int p1 = getEndOffset(); |
| while (p0 < p1) { |
| int p = calculateBreakPosition(p0, p1); |
| p0 = (p == p0) ? ++p : p; // 4410243 |
| |
| if (lineIndex == 0 && p0 >= p1) { |
| // do not use cache if there's only one line |
| lineCache = null; |
| lineEnds = null; |
| lineIndex = 1; |
| break; |
| } else if (lineEnds == null || lineIndex >= lineEnds.length) { |
| // we have 2+ lines, and the cache is not big enough |
| // we try to estimate total number of lines |
| double growFactor = ((double)(p1 - start) / (p0 - start)); |
| int newSize = (int)Math.ceil((lineIndex + 1) * growFactor); |
| newSize = Math.max(newSize, lineIndex + 2); |
| int[] tmp = new int[newSize]; |
| if (lineEnds != null) { |
| System.arraycopy(lineEnds, 0, tmp, 0, lineIndex); |
| } |
| lineEnds = tmp; |
| } |
| lineEnds[lineIndex++] = p0 - start; |
| } |
| |
| lineCount = lineIndex; |
| if (lineCount > 1) { |
| // check if the cache is too big |
| int maxCapacity = lineCount + lineCount / 3; |
| if (lineEnds.length > maxCapacity) { |
| int[] tmp = new int[maxCapacity]; |
| System.arraycopy(lineEnds, 0, tmp, 0, lineCount); |
| lineEnds = tmp; |
| } |
| } |
| |
| if (lineEnds != null && lineEnds != oldLineEnds) { |
| lineCache = new SoftReference<int[]>(lineEnds); |
| } |
| return lineEnds; |
| } |
| |
| /** |
| * Binary search in the cache for line containing specified offset |
| * (which is relative to the beginning of the view). This method |
| * assumes that cache exists. |
| */ |
| private int findLine(int offset) { |
| int[] lineEnds = lineCache.get(); |
| if (offset < lineEnds[0]) { |
| return 0; |
| } else if (offset > lineEnds[lineCount - 1]) { |
| return lineCount; |
| } else { |
| return findLine(lineEnds, offset, 0, lineCount - 1); |
| } |
| } |
| |
| private int findLine(int[] array, int offset, int min, int max) { |
| if (max - min <= 1) { |
| return max; |
| } else { |
| int mid = (max + min) / 2; |
| return (offset < array[mid]) ? |
| findLine(array, offset, min, mid) : |
| findLine(array, offset, mid, max); |
| } |
| } |
| |
| int lineCount; |
| SoftReference<int[]> lineCache = null; |
| } |
| } |
