Eclipse Tutorial

StyledText Tutorial

StyledText不同于Text，它是一个富文本编辑器，可以给选中的文本设置颜色，字体等特殊的样式。

StyleRange

StyleRange继承了org.eclipse.swt.graphics.TextStyle，是StyledText中用来绘制不同样式的关键，start和length属性分别代表了当前样式的起始位置和长度。

1. 设置颜色和字体

    StyleRange style = new StyleRange();
    style.background = backgroundColor;
    style.foreground = foregroundColor;
    style.borderColor = borderColor;
    style.font = font;
    style.strikeout = true;
    style.underline = false;
    style.underlineColor = underlineColor;
   

2. 设置图片

    void addImage(Image image) {
        int offset = styledText.getCaretOffset();
        styledText.replaceTextRange(offset, 0, "\uFFFC"); //$NON-NLS-1$
        StyleRange style = new StyleRange();
        Rectangle rect = image.getBounds();
        style.metrics = new GlyphMetrics(rect.height, 0, rect.width);
        style.data = image;
        int[] ranges = {offset, 1};
        StyleRange[] styles = {style};
        styledText.setStyleRanges(0,0, ranges, styles);
    }
   

3. 添加控件

    void addControl(Control control) {
        int offset = styledText.getCaretOffset();
        styledText.replaceTextRange(offset, 0, "\uFFFC"); //$NON-NLS-1$
        StyleRange style = new StyleRange();
        Point size = control.computeSize(SWT.DEFAULT, SWT.DEFAULT);
        int ascent = 2 * size.y / 3;
        int descent = size.y - ascent;
        style.metrics = new GlyphMetrics(ascent + MARGIN, descent + MARGIN, size.x + 2  * MARGIN);
        style.data = control;
        int[] ranges = {offset, 1};
        StyleRange[] styles = {style};
        styledText.setStyleRanges(0,0, ranges, styles);
        control.setSize(size);
    }
   

参考资料

1. StyledText snippets
2. SWT Example: CustomControlExample

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