Question

java点击按钮添加表格

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Answer 1

public class TableRenderDemo extends JPanel {
private boolean DEBUG = false;

public TableRenderDemo() {
super(new GridLayout(1,0));

JTable table = new JTable(new MyTableModel());
table.setPreferredScrollableViewportSize(new Dimension(500, 70));
table.setFillsViewportHeight(true);

//Create the scroll pane and add the table to it.
JScrollPane scrollPane = new JScrollPane(table);

//竖桐告Set up column sizes.
initColumnSizes(table);

//余明Fiddle with the Sport column's cell editors/renderers.
setUpSportColumn(table, table.getColumnModel().getColumn(2));

//轮唯Add the scroll pane to this panel.
add(scrollPane);
}

/*
* This method picks good column sizes.
* If all column heads are wider than the column's cells'
* contents, then you can just use column.sizeWidthToFit().
*/
private void initColumnSizes(JTable table) {
MyTableModel model = (MyTableModel)table.getModel();
TableColumn column = null;
Component comp = null;
int headerWidth = 0;
int cellWidth = 0;
Object[] longValues = model.longValues;
TableCellRenderer headerRenderer =
table.getTableHeader().getDefaultRenderer();

for (int i = 0; i < 5; i++) {
column = table.getColumnModel().getColumn(i);

comp = headerRenderer.getTableCellRendererComponent(
null, column.getHeaderValue(),
false, false, 0, 0);
headerWidth = comp.getPreferredSize().width;

comp = table.getDefaultRenderer(model.getColumnClass(i)).
getTableCellRendererComponent(
table, longValues[i],
false, false, 0, i);
cellWidth = comp.getPreferredSize().width;

if (DEBUG) {
System.out.println("Initializing width of column "
+ i + ". "
+ "headerWidth = " + headerWidth
+ "; cellWidth = " + cellWidth);
}

column.setPreferredWidth(Math.max(headerWidth, cellWidth));
}
}

public void setUpSportColumn(JTable table,
TableColumn sportColumn) {
//Set up the editor for the sport cells.
JComboBox comboBox = new JComboBox();
comboBox.addItem("Snowboarding");
comboBox.addItem("Rowing");
comboBox.addItem("Knitting");
comboBox.addItem("Speed reading");
comboBox.addItem("Pool");
comboBox.addItem("None of the above");

// sportColumn.setCellEditor(new DefaultCellEditor(comboBox));

//Set up tool tips for the sport cells.
// DefaultTableCellRenderer renderer = new DefaultTableCellRenderer();

// renderer.setToolTipText("Click for combo box");
sportColumn.setCellRenderer(new MyButtonRender());
sportColumn.setCellEditor(new MyButtonEditor());
}

/**
* 自定义一个往列里边添加按钮的单元格编辑器。最好继承DefaultCellEditor，不然要实现的方法就太多了。
*
*/
public class MyButtonEditor extends DefaultCellEditor
{

/**
* serialVersionUID
*/
private static final long serialVersionUID = -6546334664166791132L;

private JPanel panel;

private JButton button;

public MyButtonEditor()
{
// DefautlCellEditor有此构造器，需要传入一个，但这个不会使用到，直接new一个即可。
super(new JTextField());

// 设置点击几次激活编辑。
this.setClickCountToStart(1);

this.initButton();

this.initPanel();

// 添加按钮。
this.panel.add(this.button);
}

private void initButton()
{
this.button = new JButton("编辑");

// 设置按钮的大小及位置。
this.button.setBounds(0, 0, 50, 15);

// 为按钮添加事件。这里只能添加ActionListner事件，Mouse事件无效。
this.button.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
// 触发取消编辑的事件，不会调用tableModel的setValue方法。
MyButtonEditor.this.fireEditingCanceled();
JOptionPane.showMessageDialog(null,"Eggs are not supposed to be green.");

// 这里可以做其它操作。
// 可以将table传入，通过getSelectedRow,getSelectColumn方法获取到当前选择的行和列及其它操作等。
}
});

}

private void initPanel()
{
this.panel = new JPanel();

// panel使用绝对定位，这样button就不会充满整个单元格。
this.panel.setLayout(null);
}

/**
* 这里重写父类的编辑方法，返回一个JPanel对象即可（也可以直接返回一个Button对象，但是那样会填充满整个单元格）
*/
@Override
public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column)
{
// 只为按钮赋值即可。也可以作其它操作。
this.button.setText(value == null ? "" : String.valueOf(value));

return this.panel;
}

/**
* 重写编辑单元格时获取的值。如果不重写，这里可能会为按钮设置错误的值。
*/
@Override
public Object getCellEditorValue()
{
return this.button.getText();
}

}

Answer 2

public class TableRenderDemo extends JPanel {
private boolean DEBUG = false;

public TableRenderDemo() {
super(new GridLayout(1,0));

JTable table = new JTable(new MyTableModel());
table.setPreferredScrollableViewportSize(new Dimension(500, 70));
table.setFillsViewportHeight(true);

//Create the scroll pane and add the table to it.
JScrollPane scrollPane = new JScrollPane(table);

//竖桐告Set up column sizes.
initColumnSizes(table);

//余明Fiddle with the Sport column's cell editors/renderers.
setUpSportColumn(table, table.getColumnModel().getColumn(2));

//轮唯Add the scroll pane to this panel.
add(scrollPane);
}

/*
* This method picks good column sizes.
* If all column heads are wider than the column's cells'
* contents, then you can just use column.sizeWidthToFit().
*/
private void initColumnSizes(JTable table) {
MyTableModel model = (MyTableModel)table.getModel();
TableColumn column = null;
Component comp = null;
int headerWidth = 0;
int cellWidth = 0;
Object[] longValues = model.longValues;
TableCellRenderer headerRenderer =
table.getTableHeader().getDefaultRenderer();

for (int i = 0; i < 5; i++) {
column = table.getColumnModel().getColumn(i);

comp = headerRenderer.getTableCellRendererComponent(
null, column.getHeaderValue(),
false, false, 0, 0);
headerWidth = comp.getPreferredSize().width;

comp = table.getDefaultRenderer(model.getColumnClass(i)).
getTableCellRendererComponent(
table, longValues[i],
false, false, 0, i);
cellWidth = comp.getPreferredSize().width;

if (DEBUG) {
System.out.println("Initializing width of column "
+ i + ". "
+ "headerWidth = " + headerWidth
+ "; cellWidth = " + cellWidth);
}

column.setPreferredWidth(Math.max(headerWidth, cellWidth));
}
}

public void setUpSportColumn(JTable table,
TableColumn sportColumn) {
//Set up the editor for the sport cells.
JComboBox comboBox = new JComboBox();
comboBox.addItem("Snowboarding");
comboBox.addItem("Rowing");
comboBox.addItem("Knitting");
comboBox.addItem("Speed reading");
comboBox.addItem("Pool");
comboBox.addItem("None of the above");

// sportColumn.setCellEditor(new DefaultCellEditor(comboBox));

//Set up tool tips for the sport cells.
// DefaultTableCellRenderer renderer = new DefaultTableCellRenderer();

// renderer.setToolTipText("Click for combo box");
sportColumn.setCellRenderer(new MyButtonRender());
sportColumn.setCellEditor(new MyButtonEditor());
}

/**
* 自定义一个往列里边添加按钮的单元格编辑器。最好继承DefaultCellEditor，不然要实现的方法就太多了。
*
*/
public class MyButtonEditor extends DefaultCellEditor
{

/**
* serialVersionUID
*/
private static final long serialVersionUID = -6546334664166791132L;

private JPanel panel;

private JButton button;

public MyButtonEditor()
{
// DefautlCellEditor有此构造器，需要传入一个，但这个不会使用到，直接new一个即可。
super(new JTextField());

// 设置点击几次激活编辑。
this.setClickCountToStart(1);

this.initButton();

this.initPanel();

// 添加按钮。
this.panel.add(this.button);
}

private void initButton()
{
this.button = new JButton("编辑");

// 设置按钮的大小及位置。
this.button.setBounds(0, 0, 50, 15);

// 为按钮添加事件。这里只能添加ActionListner事件，Mouse事件无效。
this.button.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
// 触发取消编辑的事件，不会调用tableModel的setValue方法。
MyButtonEditor.this.fireEditingCanceled();
JOptionPane.showMessageDialog(null,"Eggs are not supposed to be green.");

// 这里可以做其它操作。
// 可以将table传入，通过getSelectedRow,getSelectColumn方法获取到当前选择的行和列及其它操作等。
}
});

}

private void initPanel()
{
this.panel = new JPanel();

// panel使用绝对定位，这样button就不会充满整个单元格。
this.panel.setLayout(null);
}

/**
* 这里重写父类的编辑方法，返回一个JPanel对象即可（也可以直接返回一个Button对象，但是那样会填充满整个单元格）
*/
@Override
public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column)
{
// 只为按钮赋值即可。也可以作其它操作。
this.button.setText(value == null ? "" : String.valueOf(value));

return this.panel;
}

/**
* 重写编辑单元格时获取的值。如果不重写，这里可能会为按钮设置错误的值。
*/
@Override
public Object getCellEditorValue()
{
return this.button.getText();
}

}

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