更改Swing JTable单元格颜色 [英] Changing Swing JTable Cell Colors
问题描述
我正在尝试使用JTables,TableModels,JTableHeaders,渲染器等。我正在尝试制作一个简单的虚拟表(用于练习目的),如下所示:
I'm trying to get comfortable with JTables, TableModels, JTableHeaders, renderers, etc. I am trying to make a simple dummy table (for practice purposes) that looks like this:
- 1 2 3
A A1 A2 A3
B B1 B2 B3
C C1 C2 C3
我还希望B2单元格 - 只有那个单元格 - 具有蓝色(Color.BLUE)背景 - 所有其他单元格都可以具有Swing默认颜色是自动分配的。
I also want the B2 cell - and only that cell - to have a blue (Color.BLUE) background - all other cells can have the Swing default color they are assigned automagically.
我的代码如下,基于我在本网站和互联网上找到的无数例子。但我没有得到我想要的结果。相反,我得到的表格如下:
My code is below and is based off countless examples I have found on this website and the internet at large. But I am not getting the results I want. Instead I'm getting a table that looks like this:
A A1 A2 A3
B B1 B2 B3
C C1 C2 C3
请注意第一行(标题)根本不存在。另外,通过下面列出的代码,这将执行并设置所有颜色的单元格的颜色,而不仅仅是我想要的B2单元格。
Notice that the first row (the header) isn't there at all. Additionally, with the code I list below, this executes and sets the color of all the cells that color, not just the B2 cell that I want.
代码:
public class MyTable
{
public static void main(String[] args)
{
String[][] data = getTableData();
String[] cols = getTableCols();
JFrame frame = magicallyCreateJFrame(); // I promise this works!
MyRenderer myRenderer = new MyRenderer(); // See below
DefaultTableModel defModel = new DefaultTableModel(data, cols);
JTable myTable = new JTable(defModel);
myTable.setDefaultRenderer(Object.class, myRenderer);
frame.add(myTable);
frame.pack();
frame.setVisible(true);
}
}
public static String[] getTableCols()
{
String cols =
{
"-",
"1",
"2",
"3",
};
}
public static String[][] getTableData()
{
String[][] data =
{
{
"A",
"A1",
"A2",
"A3",
},
{
"B",
"B1",
"B2",
"B3",
},
{
"C",
"C1",
"C2",
"C3",
},
};
return data;
}
快速肮脏的 MyRenderer
class:
And the quick-n-dirty MyRenderer
class:
public class MyRenderer 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);
if(row == 2 && column == 2)
c.setBackground(new java.awt.Color(0, 0, 255));
return c;
}
}
除了这是可怕的代码并打破了许多最佳实践类型的模式和技术(记住这只是我正在玩的东西),我在这里做的任何东西都是明显的-obvious 强>?为什么我没有得到表头(第一行 - 1 2 3)?为什么我的默认单元格渲染器不能在我指定的特定B2单元格上工作?
Besides the fact that this is horrible code and breaks a lot of "best practices"-type patterns and techniques (remember this is just something I'm playing around with), is there anything I'm doing here that is glaringly-obvious? Why am I not getting a table header (first row "- 1 2 3")? Why is my default cell renderer not working on the specific B2 cell I am specifying?
JTable似乎是奇怪,美丽和强大的野兽。我正在慢慢地把我的思绪包裹在他们周围,但是我对实施感到窒息。感谢任何有用的东西!
JTables seem to be strange, beautiful and powerful beasts. I'm slowly wrapping my mind around them but am choking on the implementation. Thanks to any that can help!
推荐答案
您需要确保将渲染器重置为其默认背景颜色(并处理行)选择):
You need to make sure you reset the renderer to its default background color (and handle row selection):
if (! table.isRowSelected(row))
{
if(row == 2 && column == 2)
c.setBackground(new java.awt.Color(0, 0, 255));
else
c.setBackground(table.getBackground());
}
将来发布正确的 SSCCE 。
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