如何在JTable中动态设置RowHeight [英] How to set the RowHeight dynamically in a JTable

问题描述

我想在 JTable 中放置一个比给定单元格宽度更长的String。
如何动态设置 rowHeight 以便我可以读取整个字符串？
这是一个例子：

I want to put a String in a JTable that is longer than the given cell-width. How can I set the rowHeight dynamically so that I can read the whole String? Here is an example:

import javax.swing.*;

public class ExampleTable {

public JPanel createTable() {               
    JPanel totalGUI = new JPanel();

    //define titles for table
    String[] title = {"TITLE1", "TITLE2", "TITLE3"};

    //table data
    Object[][] playerdata = {       
    {new Integer(34), "Steve", "test test test"},
    {new Integer(32), "Patrick", "dumdi dumdi dummdi dumm di di didumm"},
    {new Integer(10), "Sarah", "blabla bla bla blabla bla bla blabla"},};

    //create object 'textTable'
    JTable textTable = new JTable(playerdata,title);

    //set column width
    textTable.setAutoResizeMode(JTable.AUTO_RESIZE_OFF); 
    textTable.getColumnModel().getColumn(0).setPreferredWidth(60);
    textTable.getColumnModel().getColumn(1).setPreferredWidth(60);
    textTable.setDefaultRenderer(String.class, new RowHeightCellRenderer());

    //scrollbar
    JScrollPane scrollPane = new JScrollPane(textTable);

    totalGUI.add(scrollPane);               
    return totalGUI;
}

private static void createAndShowGUI() {

    //create main frame
    JFrame mainFrame = new JFrame("");
    ExampleTable test = new ExampleTable();

    JPanel totalGUI = new JPanel();
    totalGUI = test.createTable();

    //visible mode
    mainFrame.add(totalGUI); //integrate main panel to main frame
    mainFrame.pack();
    mainFrame.setVisible(true);     
}


public static void main (String[] args) {               

    createAndShowGUI();     

}//main
}

在这里你' ll查看代码，该代码对给定单元格的每个文本进行换行

And here you'll see the code which line-breaks each text that is to long for the given cell

    import java.awt.*;
    import javax.swing.*;
    import javax.swing.table.*;


    public class RowHeightCellRenderer extends JTextArea implements TableCellRenderer
    {
      /**
         * 
         */
        private static final long serialVersionUID = 1L;

    public Component getTableCellRendererComponent (JTable table, 
                                                    Object value, 
                                                    boolean isSelected, 
                                                    boolean hasFocus, 
                                                    int row, 
                                                    int column )  {
        setText( value.toString() );    
        return this;
      }
    }

谢谢，但我想动态实现RowHeight，取决于字符串长度...
我想读取单元格中的整个字符串/文本。有什么建议吗？

thank you but I want to implement the RowHeight dynamically, depending on String length... I want to read the whole String/text in the cell. any suggestions?

我是java初学者，这是我的第一个问题。我很高兴得到答案。

I'm java beginner and this is my first question. I would be delighted I get an answer.

推荐答案

使用JTextArea作为渲染组件时有几个问题（如果不是所有这些都已在本网站的几个QA中解释过了。试图总结一下：

There are several issues when using a JTextArea as rendering component (and most if not all of them already explained in several QA's on this site). Trying to sum them up:

根据渲染组件的大小要求调整单个行高

基本上，要走的方法是根据需要循环遍历单元格，然后

Basically, the way to go is to loop through the cells as needed, then

• 使用数据<配置其渲染器


• 询问渲染组件的首选大小


• 将表格行高设置为pref height

OP编辑过的问题中的updateRowHeight方法很好。

The updateRowHeight method in the OP's edited question is just fine.

JTextArea计算其preferredSize

为了获得一个合理的尺寸提示，它需要在另一个维度上以合适的尺寸进行播种。也就是说，如果我们想要一个需要宽度的高度，那么必须在每个调用中完成。在表的上下文中，合理的宽度是当前列宽：

to get a reasonable sizing hint for one dimension, it needs to be "seeded" with some reasonable size in the other dimension. That is if we want the height it needs a width, and that must be done in each call. In the context of a table, a reasonable width is the current column width:

public Component getTableCellRendererComponent(JTable table,
        Object value, boolean isSelected, boolean hasFocus, int row,
        int column) {
    ... // configure visuals
    setText((String) value);
    setSize(table.getColumnModel().getColumn(column).getWidth(),
            Short.MAX_VALUE);
    return this;
}// getTableCellRendererComponent

动态调整高度

在表/列/模型的某些稳定状态下完全确定的行高。因此，在初始化完成后以及任何其所依赖的状态发生更改时，您都要设置它（调用updateRowHeight）一次。

The row height it fully determined in some steady state of the table/column/model. So you set it (call updateRowHeight) once after the initialization is completed and whenever any of the state it depends on is changed.

// TableModelListener
@Override
public void tableChanged(TableModelEvent e) {
    updateRowHeights();
}

// TableColumnModelListener
@Override
public void columnMarginChanged(ChangeEvent e) {
    updateRowHeights();
}

注意

作为一般规则，getXXRendererComponent中的所有参数都是严格只读的，实现不得更改调用者的任何状态。从渲染器中更新rowHeight 错误。

As a general rule, all parameters in the getXXRendererComponent are strictly read-only, implementations must not change any state of the caller. Updating the rowHeight from within the renderer is wrong.

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