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