JTextPane is not increasing its height and cutting HTML content-CodePudding

I'm building a Swing GUi application and need to display simple HTML in text fragments (text messages with formatting and lists, maybe tables, and images). So I chose to use JTextPane which can render HTML.

I have the following element structure in my GUI:

jSplitPane -> jScrollPane -> jPanel -> jPanel with GroupLayout (Message element) -> jPanel wrapper for message content (HTML content jTextPane plus audio player custom jPanels)-> jTextPane with HTML message content

The problem is that jTextPane is cutting its content, even though none of its parents is limiting its maximum height.

I don't know, why it is happening.

Here is the MessageView structure:

General GUI structure:

Here is the result when the program is running:

Here is the HTML of the text message:

<div style="padding: 0px 3px; font-size: 14px; font-family: Tahoma">
    Some <i>text</i><br>And more,<br>And more...<br>And more...<br>And more...<br>
    And more...<br>And more...<br>
    <img src="http://popov654.pp.ru/copybox/photo.jpg" width="390" height=\"260\">";
</div>

Also after setting jTextPane HTML content I use this code (found it on the net):

try {
    Dimension d = msgContent.getPreferredSize();
    Rectangle r = msgContent.modelToView(msgContent.getDocument().getLength());
    d.height = r.y   r.height;
    msgContent.setPreferredSize(d);
    JFrame topFrame = (JFrame) SwingUtilities.getWindowAncestor(this);
    topFrame.getContentPane().validate();
} catch (Exception ex) {}

Without this code the jTextPane was just 30-40 pixels in height. But what is the most interesting, when I change the line 4 where d.height is set, and add 100 or 200 more to it, nothing is changed at all on the display.

UPDATE: commented out this block of code, and it did not change anything too at this moment.

What am I missing? Any ideas?

CodePudding user response：

It seems I found a working solution (though I'm not sure it is the best one).

I added the following code after setting HTML content:

msgContent.setMinimumSize(new Dimension(msgContent.getWidth(), msgContent.getPreferredSize().height   20));

setPreferredSize(new Dimension(getWidth(), msgContent.getPreferredSize().height   160));
SwingUtilities.invokeLater(new Runnable() {
    @Override
    public void run() {
        System.out.println(msgContent.getHeight()   ", "   getHeight());
    }
});

It is looking good now, I have the proper message height and working vertical scrolling in msgsList container.