更改 JTable 单元格颜色

发布于 2024-07-18 09:34:48 字数 864 浏览 1 评论 0原文

这让我简直要疯了。

我知道,要使用 JTable 更改表格单元格的格式,我必须使用自己的渲染器。 但我似乎无法正确实施这一点。

这是我当前的设置:

public class MyClass
{
    public static void main(String args[])
    {
        JTable myTable = new JTable(10, 10);
        myTable.setDefaultRenderer ([I dont know what to put here], new CustomRenderer());
    }
}

class CustomRenderer extends DefaultTableCellRenderer 
{
    public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column)
    {
        Component c = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);

        // Formatting
        return c;
    }
}

setDefaultRenderer 的第一个参数需要使用什么? API 只是说“类”。 我不知道该放什么。

有人可以用最简单的术语解释一下我如何实施这个吗? 请提供一个示例,说明如何在 main() 方法中更改格式。

This is driving me absolutely insane.

I know that, to change the formatting of table cells with JTable, I have to use my own renderer. But I cannot seem to implement this properly.

This is my current setup:

public class MyClass
{
    public static void main(String args[])
    {
        JTable myTable = new JTable(10, 10);
        myTable.setDefaultRenderer ([I dont know what to put here], new CustomRenderer());
    }
}

class CustomRenderer extends DefaultTableCellRenderer 
{
    public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column)
    {
        Component c = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);

        // Formatting
        return c;
    }
}

What do I need to use for the first parameter of setDefaultRenderer? The API just says 'class'. I have no idea what to put there.

Could someone just explain, in the simplest of terms, how I go about implementing this? Please provide an example of how I can change the formatting from within the main() method as well.

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七颜 2024-07-25 09:34:48

setDefaultRenderer 的第一个参数中,输入要覆盖渲染的类的类文字。 即,如果您的数据全部由字符串组成,则可以将“

myTable.setDefaultRenderer(String.class, new CustomRenderer());

如果您的数据还由 BigDecimal” 或 Integer 作为类的值组成,则必须多次调用该方法每个类类型(每种情况下的 BigDecimal.classInteger.class)。

最后,要更改背景颜色,请在渲染器中执行以下操作:

class CustomRenderer extends DefaultTableCellRenderer 
{
    public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column)
    {
        Component c = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
        c.setBackground(new java.awt.Color(255, 72, 72));
        return c;
    }
}

如果您编写的渲染器应适用于接口的所有类,您还需要修改getColumnClass 表模型的 code> 函数,并让它返回实现此接口的所有对象的接口类:

public Class<? extends Object> getColumnClass(int c) {
    Object object = getValueAt(0, c);
    if(object == null) {
        return Object.class;
    if(getValueAt(0, c) instanceof IColorable) {
        return ICarPart.class;
    } else {
        return getValueAt(0, c).getClass();
    }
}

这样就可以为 IColorable.class 注册渲染器,而无需为 IColorable.class 注册单独的渲染器每次实施。

In the first parameter for setDefaultRenderer, put the class literal for the Class that you want to override rendering. I.e., if your data consist all of strings, you can put

myTable.setDefaultRenderer(String.class, new CustomRenderer());

If your data also consists of values with BigDecimal or Integer as classes, you have to invoke that method several times for each class type (BigDecimal.class or Integer.class in each case).

And finally, to change the background color you do this in your renderer:

class CustomRenderer extends DefaultTableCellRenderer 
{
    public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column)
    {
        Component c = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
        c.setBackground(new java.awt.Color(255, 72, 72));
        return c;
    }
}

If you write a renderer that should work for all classes of an interface, you will also need to modify the getColumnClass function of your table model and let it return the interface class for all objects that implement this interface:

public Class<? extends Object> getColumnClass(int c) {
    Object object = getValueAt(0, c);
    if(object == null) {
        return Object.class;
    if(getValueAt(0, c) instanceof IColorable) {
        return ICarPart.class;
    } else {
        return getValueAt(0, c).getClass();
    }
}

With that one can register a renderer for IColorable.class and does not need to register a separate renderer for each implementation.

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