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将RTF/HTML字符串绘制到自定义swing组件中

rtf swing html java

0

Sam Barnum · 技术社区 · 15 年前

在我的Swing应用程序中,用户在 JTextPane 它使用RTFEditorKit(也可以使用HTML)。

我有以下方法:

public View createView() throws IOException, BadLocationException {
 RTFEditorKit kit = new RTFEditorKit();
 final Document document = kit.createDefaultDocument();
 kit.read(new ByteArrayInputStream(text.getBytes("UTF-8")), document, 0);
 return kit.getViewFactory().create(document.getDefaultRootElement());
}

这将返回具有以下属性的javax.swing.text.BoxView:

majorAxis = 1
majorSpan = 0
minorSpan = 0
majorReqValid = false
minorReqValid = false
majorRequest = null
minorRequest = null
majorAllocValid = false
majorOffsets = {int[0]@2321}
majorSpans = {int[0]@2322}
minorAllocValid = false
minorOffsets = {int[0]@2323}
minorSpans = {int[0]@2324}
tempRect = {java.awt.Rectangle@2325}"java.awt.Rectangle[x=0,y=0,width=0,height=0]"
children = {javax.swing.text.View[1]@2326}
nchildren = 0
left = 0
right = 0
top = 0
bottom = 0
childAlloc = {java.awt.Rectangle@2327}"java.awt.Rectangle[x=0,y=0,width=0,height=0]"
parent = null
elem = {javax.swing.text.DefaultStyledDocument$SectionElement@2328}"BranchElement(section) 0,35\n"

请注意,parent=null,nchildren=0。这意味着这里没有什么真正有用的东西。我打个电话就能搞定一些事情 JTextPane.getUI().paint ,但是文本窗格需要是可见的,这样做感觉是错误的。

2 回复 | 直到 15 年前

1

0

camickr 15 年前

查看 ScreenImage 类,该类允许您创建任何Swing组件的BuffereImage。它也适用于不可见的Swing组件,但是您确实必须首先进行渲染。

2

1

Sam Barnum 15 年前

这段代码可以正常工作,但似乎不太理想。有更好的方法吗?另外,有什么好方法可以将文本渲染到图形上0,0以外的其他位置?

private static void testRtfRender() {
    String s = "{\\rtf1\\ansi\n" +
            "{\\fonttbl\\f0\\fnil Monospaced;\\f1\\fnil Lucida Grande;}\n" +
            "\n" +
            "\\f1\\fs26\\i0\\b0\\cf0 this is a \\b test\\b0\\par\n" +
            "}";

    JTextPane pane = new JTextPane();
    pane.setContentType("text/rtf");
    pane.setText(s);

    final Dimension preferredSize = pane.getUI().getPreferredSize(pane);
    int w = preferredSize.width;
    int h = preferredSize.height;

    pane.setSize(w, h);
    pane.addNotify();
    pane.validate();

    // would be nice to use this box view instead of instantiating a UI
    // however, unless you call setParent() on the view it's useless
    // What should the parent of a root element be?
    //BoxView view = (BoxView) pane.getEditorKit().getViewFactory().create(pane.getStyledDocument().getDefaultRootElement());
    //view.paint(d, new Rectangle(w, h));

    BufferedImage img = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);
    final Graphics2D d = img.createGraphics();
    d.setClip(0, 0, w, h); // throws a NullPointerException if I leave this out
    pane.getUI().paint(d, pane);
    d.dispose();
    JOptionPane.showMessageDialog(null, new JLabel(new ImageIcon(img)));
}