Java 类org.eclipse.swt.graphics.TextLayout 实例源码

/**
 * <p>
 * Creates and initializes the text layout used to compute the size hint.
 * </p>
 * 
 * @since 3.2
 */
private void createTextLayout() {
    fTextLayout= new TextLayout(fBrowser.getDisplay());

    // Initialize fonts
    String symbolicFontName= fSymbolicFontName == null ? JFaceResources.DIALOG_FONT : fSymbolicFontName;
    Font font = JFaceResources.getFont(symbolicFontName);
    fTextLayout.setFont(font);
    fTextLayout.setWidth(-1);
    font = JFaceResources.getFontRegistry().getBold(symbolicFontName);
    fBoldStyle = new TextStyle(font, null, null);

    // Compute and set tab width
    fTextLayout.setText("    ");
    int tabWidth = fTextLayout.getBounds().width;
    fTextLayout.setTabs(new int[] {tabWidth});

    fTextLayout.setText("");
}

/**
 * <p>
 * Creates and initializes the text layout used to compute the size hint.
 * </p>
 * 
 * @since 3.2
 */
private void createTextLayout() {
    fTextLayout= new TextLayout(fBrowser.getDisplay());

    // Initialize fonts
    String symbolicFontName= fSymbolicFontName == null ? JFaceResources.DIALOG_FONT : fSymbolicFontName;
    Font font = JFaceResources.getFont(symbolicFontName);
    fTextLayout.setFont(font);
    fTextLayout.setWidth(-1);
    font = JFaceResources.getFontRegistry().getBold(symbolicFontName);
    fBoldStyle = new TextStyle(font, null, null);

    // Compute and set tab width
    fTextLayout.setText("    ");
    int tabWidth = fTextLayout.getBounds().width;
    fTextLayout.setTabs(new int[] {tabWidth});

    fTextLayout.setText("");
}

/**
 * <p>
 * Creates and initializes the text layout used to compute the size hint.
 * </p>
 * 
 * @since 3.2
 */
private void createTextLayout() {
    fTextLayout= new TextLayout(fBrowser.getDisplay());

    // Initialize fonts
    String symbolicFontName= fSymbolicFontName == null ? JFaceResources.DIALOG_FONT : fSymbolicFontName;
    Font font = JFaceResources.getFont(symbolicFontName);
    fTextLayout.setFont(font);
    fTextLayout.setWidth(-1);
    font = JFaceResources.getFontRegistry().getBold(symbolicFontName);
    fBoldStyle = new TextStyle(font, null, null);

    // Compute and set tab width
    fTextLayout.setText("    ");
    int tabWidth = fTextLayout.getBounds().width;
    fTextLayout.setTabs(new int[] {tabWidth});

    fTextLayout.setText("");
}

/**
 * <p>
 * Creates and initializes the text layout used to compute the size hint.
 * </p>
 * 
 * @since 3.2
 */
private void createTextLayout() {
    fTextLayout= new TextLayout(fBrowser.getDisplay());

    // Initialize fonts
    String symbolicFontName= fSymbolicFontName == null ? JFaceResources.DIALOG_FONT : fSymbolicFontName;
    Font font = JFaceResources.getFont(symbolicFontName);
    fTextLayout.setFont(font);
    fTextLayout.setWidth(-1);
    font = JFaceResources.getFontRegistry().getBold(symbolicFontName);
    fBoldStyle = new TextStyle(font, null, null);

    // Compute and set tab width
    fTextLayout.setText("    ");
    int tabWidth = fTextLayout.getBounds().width;
    fTextLayout.setTabs(new int[] {tabWidth});

    fTextLayout.setText("");
}

/**
 * <p>
 * Creates and initializes the text layout used to compute the size hint.
 * </p>
 * 
 * @since 3.2
 */
private void createTextLayout() {
    fTextLayout= new TextLayout(fBrowser.getDisplay());

    // Initialize fonts
    String symbolicFontName= fSymbolicFontName == null ? JFaceResources.DIALOG_FONT : fSymbolicFontName;
    Font font = JFaceResources.getFont(symbolicFontName);
    fTextLayout.setFont(font);
    fTextLayout.setWidth(-1);
    font = JFaceResources.getFontRegistry().getBold(symbolicFontName);
    fBoldStyle = new TextStyle(font, null, null);

    // Compute and set tab width
    fTextLayout.setText("    ");
    int tabWidth = fTextLayout.getBounds().width;
    fTextLayout.setTabs(new int[] {tabWidth});

    fTextLayout.setText("");
}

/**
 * <p>
 * Creates and initializes the text layout used to compute the size hint.
 * </p>
 * 
 * @since 3.2
 */
private void createTextLayout() {
    fTextLayout= new TextLayout(fBrowser.getDisplay());

    // Initialize fonts
    String symbolicFontName= fSymbolicFontName == null ? JFaceResources.DIALOG_FONT : fSymbolicFontName;
    Font font = JFaceResources.getFont(symbolicFontName);
    fTextLayout.setFont(font);
    fTextLayout.setWidth(-1);
    font = JFaceResources.getFontRegistry().getBold(symbolicFontName);
    fBoldStyle = new TextStyle(font, null, null);

    // Compute and set tab width
    fTextLayout.setText("    ");
    int tabWidth = fTextLayout.getBounds().width;
    fTextLayout.setTabs(new int[] {tabWidth});

    fTextLayout.setText("");
}

/**
 * <p>
 * Creates and initializes the text layout used to compute the size hint.
 * </p>
 * 
 * @since 3.2
 */
private void createTextLayout() {
    fTextLayout= new TextLayout(fBrowser.getDisplay());

    // Initialize fonts
    String symbolicFontName= fSymbolicFontName == null ? JFaceResources.DIALOG_FONT : fSymbolicFontName;
    Font font = JFaceResources.getFont(symbolicFontName);
    fTextLayout.setFont(font);
    fTextLayout.setWidth(-1);
    font = JFaceResources.getFontRegistry().getBold(symbolicFontName);
    fBoldStyle = new TextStyle(font, null, null);

    // Compute and set tab width
    fTextLayout.setText("    ");
    int tabWidth = fTextLayout.getBounds().width;
    fTextLayout.setTabs(new int[] {tabWidth});

    fTextLayout.setText("");
}

/**
 * Creates and initializes the text layout used to compute the size hint.
 * 
 * @since 3.2
 */
private void createTextLayout()
{
    fTextLayout = new TextLayout(fBrowser.getDisplay());

    // Initialize fonts
    String symbolicFontName = fSymbolicFontName == null ? JFaceResources.DIALOG_FONT : fSymbolicFontName;
    Font font = JFaceResources.getFont(symbolicFontName);
    fTextLayout.setFont(font);
    fTextLayout.setWidth(-1);
    font = JFaceResources.getFontRegistry().getBold(symbolicFontName);
    fBoldStyle = new TextStyle(font, null, null);

    // Compute and set tab width
    fTextLayout.setText("    "); //$NON-NLS-1$
    int tabWidth = fTextLayout.getBounds().width;
    fTextLayout.setTabs(new int[] { tabWidth });
    fTextLayout.setText(""); //$NON-NLS-1$
}

public static String shortenText(final GC gc, String text, final int width, final String ellipses) {

        if (gc.textExtent(text, 0).x <= width) {
            return text;
        }

        final int ellipseWidth = gc.textExtent(ellipses, 0).x;
        final int length = text.length();
        final TextLayout layout = new TextLayout(gc.getDevice());
        layout.setText(text);

        int end = layout.getPreviousOffset(length, SWT.MOVEMENT_CLUSTER);
        while (end > 0) {
            text = text.substring(0, end);
            final int l = gc.textExtent(text, 0).x;
            if (l + ellipseWidth <= width) {
                break;
            }
            end = layout.getPreviousOffset(end, SWT.MOVEMENT_CLUSTER);
        }
        layout.dispose();
        return end == 0 ? text.substring(0, 1) : text + ellipses;
    }

public int getPreferredHeight(LayerCell cell, GC gc, IConfigRegistry configRegistry) {
    if (innerTagFactory == null) {
        innerTagFactory = new XliffInnerTagFactory(placeHolderBuilder);
    }
    innerTagFactory.reset();
    TextLayout layout = getCellTextLayout(cell);

    int counts = layout.getLineCount();
    int contentHeight = 0;
    for (int i = 0; i < counts; i++) {
        contentHeight += layout.getLineBounds(i).height;
    }
    layout.dispose();
    contentHeight += Math.max(counts - 1, 0) * SEGMENT_LINE_SPACING;
    contentHeight += 4;// 加上编辑模式下，StyledTextCellEditor的边框
    contentHeight += topPadding;
    contentHeight += bottomPadding;
    return contentHeight;
}

public TextLayout getTextLayout(GC gc, GridItem item, int columnIndex, boolean innerTagStyled, boolean drawInnerTag) {
    TextLayout layout = new TextLayout(gc.getDevice());
    layout.setFont(font);
    layout.setTabs(new int[]{tabWidth});
    innerTagFactory.reset();

    String displayStr = "";
    try{
        displayStr = InnerTagUtil.resolveTag(innerTagFactory.parseInnerTag(item.getText(columnIndex)));
    }catch (NullPointerException e) {
        return null;
    }
    layout.setText(displayStr);
    int width = getBounds().width - leftMargin - rightMargin;
    layout.setWidth(width < 1 ? 1 : width);
    layout.setSpacing(Constants.SEGMENT_LINE_SPACING);
    layout.setAlignment(SWT.LEFT);
    layout.setOrientation(item.getParent().getOrientation());
    if (displayStr.length() != 0 && innerTagStyled) {
        attachInnertTagStyle(gc, layout, drawInnerTag);
    }
    return layout;
}

protected void drawInnerTag(GC gc, TextLayout layout) {
    String displayStr = layout.getText();
    List<InnerTagBean> innerTagBeans = innerTagFactory.getInnerTagBeans();
    Rectangle bounds = getBounds();
    for (InnerTagBean innerTagBean : innerTagBeans) {
        String placeHolder = placeHolderBuilder.getPlaceHolder(innerTagBeans, innerTagBeans.indexOf(innerTagBean));
        int start = displayStr.indexOf(placeHolder);
        if (start == -1) {
            continue;
        }           
        if (gc != null) {
            Point p = layout.getLocation(start, false);
            int x = bounds.x + p.x + leftMargin;
            x += SEGMENT_LINE_SPACING;

            Point tagSize = tagRender.calculateTagSize(innerTagBean);
            int lineIdx = layout.getLineIndex(start);
            Rectangle r = layout.getLineBounds(lineIdx);
            int y = bounds.y + p.y + topMargin + r.height / 2 - tagSize.y /2;               
            tagRender.draw(gc, innerTagBean, x, y - layout.getAscent());
        }
    }
}

public static void configure(TextLayout textLayout) {
    String text = textLayout.getText();
    Document doc = new Document(text);
    ITokenScanner scanner = getRecipeScanner(doc);
    scanner.setRange(doc, 0, doc.getLength());
    IToken token;
    while ((token = scanner.nextToken()) != Token.EOF) {
        int offset = scanner.getTokenOffset();
        int length = scanner.getTokenLength();
        Object data = token.getData();
        if (data != null && data instanceof TextStyle) {
            TextStyle textStyle = (TextStyle) data;
            textLayout.setStyle(textStyle, offset, offset + length - 1);
        }
    }
}

public static void configure(TextLayout textLayout) {
    String text = textLayout.getText();
    Document doc = new Document(text);
    ITokenScanner scanner = getRecipeScanner(doc);
    scanner.setRange(doc, 0, doc.getLength());
    IToken token;
    while ((token = scanner.nextToken()) != Token.EOF) {
        int offset = scanner.getTokenOffset();
        int length = scanner.getTokenLength();
        Object data = token.getData();
        if (data != null && data instanceof TextStyle) {
            TextStyle textStyle = (TextStyle) data;
            textLayout.setStyle(textStyle, offset, offset + length - 1);
        }
    }
    scanner = null;
    doc = null;
}

/**
 * @see Graphics#drawTextLayout(TextLayout, int, int, int, int, Color,
 *      Color)
 */
public void drawTextLayout(TextLayout layout, int x, int y,
        int selectionStart, int selectionEnd, Color selectionForeground,
        Color selectionBackground) {
    TextLayout scaled = zoomTextLayout(layout);
    if (scaled == null) {
        return;
    }
    try {
        graphics.drawTextLayout(scaled,
                (int) Math.floor(x * zoom + fractionalX),
                (int) Math.floor(y * zoom + fractionalY), selectionStart,
                selectionEnd, selectionBackground, selectionForeground);
    } finally {
        scaled.dispose();
    }
}

Point getPointInBox(TextFragmentBox box, int offset, int index,
        boolean trailing) {
    offset -= box.offset;
    offset = Math.min(box.length, offset);
    Point result = new Point(0, box.getTextTop());
    if (bidiInfo == null) {
        if (trailing && offset < box.length)
            offset++;
        String substring = getText().substring(box.offset,
                box.offset + offset);
        result.x = getTextUtilities().getTextExtents(substring, getFont()).width;
    } else {
        TextLayout layout = FlowUtilities.getTextLayout();
        layout.setFont(getFont());
        String fragString = getBidiSubstring(box, index);
        layout.setText(fragString);
        offset += getBidiPrefixLength(box, index);
        result.x = layout.getLocation(offset, trailing).x;
        if (isMirrored())
            result.x = box.width - result.x;
    }
    result.x += box.getX();
    return result;
}

public static void configure(TextLayout textLayout) {
    String text = textLayout.getText();
    Document doc = new Document(text);
    ITokenScanner scanner = getRecipeScanner(doc);
    scanner.setRange(doc, 0, doc.getLength());
    IToken token;
    while ((token = scanner.nextToken()) != Token.EOF) {
        int offset = scanner.getTokenOffset();
        int length = scanner.getTokenLength();
        Object data = token.getData();
        if (data != null && data instanceof TextStyle) {
            TextStyle textStyle = (TextStyle) data;
            textLayout.setStyle(textStyle, offset, offset + length - 1);
        }
    }
}

public int getPreferredHeight(LayerCell cell, GC gc, IConfigRegistry configRegistry) {
    if (innerTagFactory == null) {
        innerTagFactory = new XliffInnerTagFactory(placeHolderBuilder);
    }
    innerTagFactory.reset();
    TextLayout layout = getCellTextLayout(cell);

    int counts = layout.getLineCount();
    int contentHeight = 0;
    for (int i = 0; i < counts; i++) {
        contentHeight += layout.getLineBounds(i).height;
    }
    layout.dispose();
    contentHeight += Math.max(counts - 1, 0) * SEGMENT_LINE_SPACING;
    contentHeight += 4;// 加上编辑模式下，StyledTextCellEditor的边框
    contentHeight += topPadding;
    contentHeight += bottomPadding;
    return contentHeight;
}

public TextLayout getTextLayout(GC gc, GridItem item, int columnIndex, boolean innerTagStyled, boolean drawInnerTag) {
    TextLayout layout = new TextLayout(gc.getDevice());
    layout.setFont(JFaceResources.getFont(net.heartsome.cat.ts.ui.Constants.MATCH_VIEWER_TEXT_FONT));
    innerTagFactory.reset();

    String displayStr = "";
    try{
        displayStr = InnerTagUtil.resolveTag(innerTagFactory.parseInnerTag(item.getText(columnIndex)));
    }catch (NullPointerException e) {
        return null;
    }
    layout.setText(displayStr);
    int width = getBounds().width - leftMargin - rightMargin;
    layout.setWidth(width < 1 ? 1 : width);
    layout.setSpacing(Constants.SEGMENT_LINE_SPACING);
    layout.setAlignment(SWT.LEFT);

    if (displayStr.length() != 0 && innerTagStyled) {
        attachInnertTagStyle(gc, layout, drawInnerTag);
    }
    return layout;
}

public static void configure(TextLayout textLayout) {
    String text = textLayout.getText();
    Document doc = new Document(text);
    ITokenScanner scanner = getRecipeScanner(doc);
    scanner.setRange(doc, 0, doc.getLength());
    IToken token;
    while ((token = scanner.nextToken()) != Token.EOF) {
        int offset = scanner.getTokenOffset();
        int length = scanner.getTokenLength();
        Object data = token.getData();
        if (data != null && data instanceof TextStyle) {
            TextStyle textStyle = (TextStyle) data;
            textLayout.setStyle(textStyle, offset, offset + length - 1);
        }
    }
}

public static void configure(TextLayout textLayout) {
    String text = textLayout.getText();
    Document doc = new Document(text);
    ITokenScanner scanner = getRecipeScanner(doc);
    scanner.setRange(doc, 0, doc.getLength());
    IToken token;
    while ((token = scanner.nextToken()) != Token.EOF) {
        int offset = scanner.getTokenOffset();
        int length = scanner.getTokenLength();
        Object data = token.getData();
        if (data != null && data instanceof TextStyle) {
            TextStyle textStyle = (TextStyle) data;
            textLayout.setStyle(textStyle, offset, offset + length - 1);
        }
    }
    scanner = null;
    doc = null;
}

protected void drawBlankString( Graphics g, String s )
{
    TextLayout tl = new TextLayout( Display.getCurrent( ) );

    // bidi_hcg: Apply text direction
    tl.setOrientation( this.rtl ? SWT.RIGHT_TO_LEFT : SWT.LEFT_TO_RIGHT );

    tl.setText( s );
    Rectangle rc = tl.getBounds( );

    int left = ( getClientArea( ).width - rc.width ) / 2;
    int top = ( getClientArea( ).height - rc.height ) / 2;

    g.drawText( s, getClientArea( ).x + left, getClientArea( ).y + top );
    tl.dispose();
}

/**
 * Convenience method
 * 
 * @param inWidget
 *            {@link StyledText}
 * @return {@link PaintObjectListener}
 */
public static PaintObjectListener getPaintObjectListener(
        final StyledText inWidget) {
    return new PaintObjectListener() {
        @Override
        public void paintObject(final PaintObjectEvent inEvent) {
            final Display lDisplay = inEvent.display;
            final StyleRange lStyle = inEvent.style;
            final int lPosition = inEvent.x + lStyle.metrics.width
                    - BULLET_WIDTH + 2;
            Font lFont = lStyle.font;
            if (lFont == null)
                lFont = inWidget.getFont();
            final TextLayout lLayout = new TextLayout(lDisplay);
            lLayout.setAscent(inEvent.ascent);
            lLayout.setDescent(inEvent.descent);
            lLayout.setFont(lFont);
            lLayout.setText(String.format("%s.", inEvent.bulletIndex + 1)); //$NON-NLS-1$
            lLayout.draw(inEvent.gc, lPosition, inEvent.y);
            lLayout.dispose();
        }
    };
}

private TextLayout getTextLayout(Plugin plugin, boolean selected) {
    final TextLayout textLayout = new TextLayout(display);
    int length1 = plugin.getName().length();
    String text = plugin.getName() + "\n \n" + plugin.getDescription();
    textLayout.setText(text);
    textLayout.setStyle(selected ? styleTitleSelected : styleTitle, 0, length1);
    textLayout.setStyle(styleGap, length1 + 1, length1 + 2);
    textLayout.setStyle(selected ? styleRowSelected : styleRow, length1 + 3, text.length());
    return textLayout;
}

protected TextLayout getTextLayout(int lineIndex, int orientation, int width, int lineSpacing, Object obj,
        Method proceed, Object[] args) throws Exception {
    args[0] = lineIndex;
    args[1] = orientation;
    args[2] = width;
    args[3] = lineSpacing;
    return (TextLayout) proceed.invoke(obj, args);
}

boolean isSameLineSpacing(int lineIndex, int newLineSpacing) {
    if (layouts == null) {
        return false;
    }
    int layoutIndex = lineIndex - topIndex;
    if (0 <= layoutIndex && layoutIndex < layouts.length) {
        TextLayout layout = layouts[layoutIndex];
        return layout != null && !layout.isDisposed() && layout.getSpacing() == newLineSpacing;
    }
    return false;
}

protected void updateImage() {
    Rectangle bounds = getBounds();
    if (bounds.width <= 0 || bounds.height <= 0)
        return;
    TextLayout layout = new TextLayout(Display.getDefault());
    //layout.setFont(getFont());
    layout.setText(getText());
    for (StyleRange styleRange : ranges) {
        //styleRange.background = ColorConstants.white;
        layout.setStyle(styleRange, styleRange.start, styleRange.start
                + styleRange.length);
    }
    if (image != null && !image.isDisposed()) {
        image.dispose();
    }
    image = new Image(Display.getDefault(), bounds.width, bounds.height);

    GC gc = new GC(image);
    gc.setBackground(ColorConstants.red);
    layout.draw(gc, 0, 0);
    image.getImageData().transparentPixel = image.getImageData().palette
            .getPixel(ColorConstants.white.getRGB());


    layout.dispose();
    gc.dispose();
}

public CellRenderer(final Grid<T> grid) {
    super(grid);
    errorImage = getImage("cell_error.gif");            
    contentLocation = new Point(0, 0);
    imageExtent = new Point(0, 0);
    innerBounds = new Rectangle(0, 0, 0, 0);
    textLayout = new TextLayout(grid.getDisplay());
    anchorCollector = new StyleCollector();
    grid.addDisposeListener(new DisposeListener() {
        @Override
        public void widgetDisposed(DisposeEvent e) {
            textLayout.dispose();
        }
    });
}

int calculateOffset(final TextLayout layout, final int offset) {
    final int nextOffset = layout.getNextOffset(offset, SWT.MOVEMENT_CLUSTER);
    if (nextOffset != offset) {
        return layout.getPreviousOffset(nextOffset, SWT.MOVEMENT_CLUSTER);
    }
    return offset;
}

/**
 * Shorten the given text <code>t</code> so that its length doesn't exceed
 * the given width. The default implementation replaces characters in the
 * center of the original string with an ellipsis ("...").
 * Override if you need a different strategy.
 * 
 * @param gc the gc to use for text measurement
 * @param t the text to shorten
 * @param width the width to shorten the text to, in pixels
 * @return the shortened text
 * Note, this code was copied from 
 *   org.eclipse.swt.custom.CLabel.shortenText()
 */
protected String shortenText(GC gc, String t, int width) {
    if (t == null) return null;
    int w = gc.textExtent(ELLIPSIS, DRAW_FLAGS).x;
    if (width<=w) return t;
    int l = t.length();
    int max = l/2;
    int min = 0;
    int mid = (max+min)/2 - 1;
    if (mid <= 0) return t;
    TextLayout layout = new TextLayout (getDisplay());
    layout.setText(t);
    mid = validateOffset(layout, mid);
    while (min < mid && mid < max) {
        String s1 = t.substring(0, mid);
        String s2 = t.substring(validateOffset(layout, l-mid), l);
        int l1 = gc.textExtent(s1, DRAW_FLAGS).x;
        int l2 = gc.textExtent(s2, DRAW_FLAGS).x;
        if (l1+w+l2 > width) {
            max = mid;          
            mid = validateOffset(layout, (max+min)/2);
        } else if (l1+w+l2 < width) {
            min = mid;
            mid = validateOffset(layout, (max+min)/2);
        } else {
            min = max;
        }
    }
    String result = mid == 0 ? t : t.substring(0, mid) + ELLIPSIS + t.substring(validateOffset(layout, l-mid), l);
    layout.dispose();
    return result;
}

private TextLayout getCellTextLayout(LayerCell cell) {
    int orientation = editor.getTable().getStyle() & (SWT.LEFT_TO_RIGHT | SWT.RIGHT_TO_LEFT);
    TextLayout layout = new TextLayout(editor.getTable().getDisplay());
    layout.setOrientation(orientation);
    layout.setSpacing(Constants.SEGMENT_LINE_SPACING);
    layout.setFont(font);
    layout.setAscent(ascent);
    layout.setDescent(descent); // 和 StyledTextEditor 同步
    layout.setTabs(new int[] { tabWidth });

    Rectangle rectangle = cell.getBounds();
    int width = rectangle.width - leftPadding - rightPadding;
    width -= 1;
    if (wrapText && width > 0) {
        layout.setWidth(width);
    }

    String displayText = InnerTagUtil.resolveTag(innerTagFactory.parseInnerTag((String) cell.getDataValue()));
    if (XliffEditorParameter.getInstance().isShowNonpirnttingCharacter()) {
        displayText = displayText.replaceAll("\\n", Constants.LINE_SEPARATOR_CHARACTER + "\n");
        displayText = displayText.replaceAll("\\t", Constants.TAB_CHARACTER + "\u200B");
        displayText = displayText.replaceAll(" ", Constants.SPACE_CHARACTER + "\u200B");
    }
    layout.setText(displayText);
    List<InnerTagBean> innerTagBeans = innerTagFactory.getInnerTagBeans();
    for (InnerTagBean innerTagBean : innerTagBeans) {
        String placeHolder = placeHolderBuilder.getPlaceHolder(innerTagBeans, innerTagBeans.indexOf(innerTagBean));
        int start = displayText.indexOf(placeHolder);
        if (start == -1) {
            continue;
        }
        TextStyle style = new TextStyle();
        Point rect = tagRender.calculateTagSize(innerTagBean);
        style.metrics = new GlyphMetrics(rect.y, 0, rect.x + SEGMENT_LINE_SPACING * 2);
        layout.setStyle(style, start, start + placeHolder.length() - 1);
    }

    return layout;
}

private void appendNonprintingStyle(TextLayout layout) {
    TextStyle style = new TextStyle(font, GUIHelper.getColor(new RGB(100, 100, 100)), null);
    String s = layout.getText();
    Matcher matcher = Constants.NONPRINTING_PATTERN.matcher(s);
    while (matcher.find()) {
        int start = matcher.start();
        int end = matcher.end();
        // style.metrics = new GlyphMetrics(10, 0, 1);
        layout.setStyle(style, start, end - 1);
    }
}

/**
 * 设置字体
 * @param font
 *            ;
 */
public void setFont(Font font) {
    TextLayout layout = new TextLayout(Display.getDefault());
    layout.setFont(font);
    StringBuffer tabBuffer = new StringBuffer(tabSize);
    for (int i = 0; i < tabSize; i++) {
        tabBuffer.append(' ');
    }
    layout.setText(tabBuffer.toString());
    tabWidth = layout.getBounds().width;
    layout.dispose();
    this.font = font;
}

/**
 * @see Graphics#drawTextLayout(TextLayout, int, int, int, int, Color,
 *      Color)
 */
public void drawTextLayout(TextLayout layout, int x, int y,
        int selectionStart, int selectionEnd, Color selectionForeground,
        Color selectionBackground) {
    // $TODO probably just call checkPaint since Font and BG color don't
    // apply
    checkText();
    layout.draw(gc, x + translateX, y + translateY, selectionStart,
            selectionEnd, selectionForeground, selectionBackground);
}

/**
 * @param frag
 * @param string
 * @param font
 * @since 3.1
 */
private static void initBidi(TextFragmentBox frag, String string, Font font) {
    if (frag.requiresBidi()) {
        TextLayout textLayout = getTextLayout();
        textLayout.setFont(font);
        // $TODO need to insert overrides in front of string.
        textLayout.setText(string);
    }
}

/**
 * @see TextLayout#getBounds()
 */
protected Rectangle getTextLayoutBounds(String s, Font f, int start, int end) {
    TextLayout textLayout = getTextLayout();
    textLayout.setFont(f);
    textLayout.setText(s);
    return textLayout.getBounds(start, end);
}

/**
 * Calculates the width taken up by the given text before a line-break is
 * encountered.
 * 
 * @param text
 *            the text in which the break is to be found
 * @param width
 *            the width before the next line-break (if one's found; the
 *            width of all the given text, otherwise) will be added on to
 *            the first int in the given array
 * @return <code>true</code> if a line-break was found
 * @since 3.1
 */
boolean addLeadingWordWidth(String text, int[] width) {
    if (text.length() == 0)
        return false;
    // if (Character.isWhitespace(text.charAt(0)))
    // return true;

    text = 'a' + text + 'a';
    // TODO: GEFGWT commented out
    // FlowUtilities.LINE_BREAK.setText(text);
    // int index = FlowUtilities.LINE_BREAK.next() - 1;
    int index = 0;
    // GEFGWT commented out

    if (index == 0)
        return true;
    // while (Character.isWhitespace(text.charAt(index)))
    // index--;
    // boolean result = index < text.length() - 1;
    // index should point to the end of the actual text (not including the
    // 'a' that was
    // appended), if there were no breaks
    if (index == text.length() - 1)
        index--;
    text = text.substring(1, index + 1);

    if (bidiInfo == null)
        width[0] += getTextUtilities().getTextExtents(text, getFont()).width;
    else {
        TextLayout textLayout = FlowUtilities.getTextLayout();
        textLayout.setFont(getFont());
        textLayout.setText(text);
        width[0] += textLayout.getBounds().width;
    }
    return true;
}

private int findOffset(Point p, int[] trailing, TextFragmentBox box,
        int boxIndex) {
    if (box == null)
        return -1;
    TextLayout layout = FlowUtilities.getTextLayout();
    layout.setFont(getFont());
    layout.setText(getBidiSubstring(box, boxIndex));
    int x = p.x - box.getX();
    if (isMirrored())
        x = box.getWidth() - x;
    int layoutOffset = layout
            .getOffset(x, p.y - box.getTextTop(), trailing);
    return box.offset + layoutOffset - getBidiPrefixLength(box, boxIndex);
}

protected void paintText(Graphics g, String draw, int x, int y,
        int bidiLevel) {
    if (bidiLevel == -1) {
        g.drawText(draw, x, y);
    } else {
        TextLayout tl = FlowUtilities.getTextLayout();
        if (isMirrored())
            tl.setOrientation(SWT.RIGHT_TO_LEFT);
        tl.setFont(g.getFont());
        tl.setText(draw);
        g.drawTextLayout(tl, x, y);
    }
}

/**
 * @param layout
 * @param cell
 * @param applyColors
 * @return the text width delta (0 if the text layout contains no other font)
 */
private int updateTextLayout(TextLayout layout, ViewerCell cell,
        boolean applyColors) {
    layout.setStyle(null, 0, Integer.MAX_VALUE); // clear old styles

    layout.setText(cell.getText());
    layout.setFont(cell.getFont()); // set also if null to clear previous usages

    int originalTextWidth = layout.getBounds().width; // text width without any styles
    boolean containsOtherFont= false;

    StyleRange[] styleRanges = cell.getStyleRanges();
    if (styleRanges != null) { // user didn't fill styled ranges
        for (int i = 0; i < styleRanges.length; i++) {
            StyleRange curr = prepareStyleRange(styleRanges[i], applyColors);
            layout.setStyle(curr, curr.start, curr.start + curr.length - 1);
            if (curr.font != null) {
                containsOtherFont= true;
            }
        }
    }
    int textWidthDelta = 0;
    if (containsOtherFont) {
        textWidthDelta = layout.getBounds().width - originalTextWidth;
    }
    return textWidthDelta;
}