Mapping of JTable rows and columns onto frame object
Hi,
I am using Java Graphics api. Like to map my JTable rows and columns onto t=
he canvas with exact dimensions. I tried using jTable.getCellRect() api to =
get the width, height of a cell and map it on the panel using graphics obje=
ct. But it gives me the incorrect dimensions. Following is the sample code.
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.*;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.table.*;
import java.util.*;
import java.awt.*;
public class SimpleTableDemo extends JPanel {
private boolean DEBUG = false;
private int spacing = 6;
private Map columnSizes = new HashMap();
String[] columnNames = {"First Name",
"Last Name",
"Sport",
"# of Years",
"Vegetarian"};
Object[][] data = {
{"Kathy", "Smith",
"SnowboardingXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX", new Inte=
ger(5), new Boolean(false)},
{"John", "Doe",
"Rowing", new Integer(3), new Boolean(true)},
{"Sue", "Black",
"Knitting", new Integer(2), new Boolean(false)},
{"Jane", "White",
"Speed reading", new Integer(20), new Boolean(true)},
{"Joe", "Brown",
"Pool", new Integer(10), new Boolean(false)}
};
final JTable table = new JTable(data, columnNames);
Panel1 panel;
public SimpleTableDemo() {
super(new GridLayout(3,0));
table.setPreferredScrollableViewportSize(new Dimension(500, 70));
//table.setFillsViewportHeight(true);
if (DEBUG) {
table.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
printDebugData(table);
}
});
}
//Create the scroll pane and add the table to it.
JScrollPane scrollPane = new JScrollPane(table);
//Add the scroll pane to this panel.
add(scrollPane);
panel = new Panel1();
Rectangle rect = table.getCellRect(0,0,true);
panel.setX(table.getWidth());
panel.setY(0);
panel.setWidth(rect.width);
panel.setHeight(rect.height);
panel.setStr(table.getModel().getValueAt(0,0).toString());
panel.setModel(table);
add(panel);
final JComboBox jNumberComboBoxSize = new JComboBox();
jNumberComboBoxSize.setModel(new javax.swing.DefaultComboBoxModel(new Str=
ing[] { "11", "12", "14", "16", "18", "20", "24", "30", "36", "48", "72" })=
);
jNumberComboBoxSize.addActionListener(new java.awt.event.ActionList=
ener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jNumberComboBoxSizeActionPerformed(jNumberComboBoxSize);
}
});
JPanel panel2 = new JPanel();
panel2.add(jNumberComboBoxSize);
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add(panel2);
adjustColumns();
}
private void jNumberComboBoxSizeActionPerformed(JComboBox jNumberComboBoxS=
ize)
{
int fontSize = Integer.parseInt(jNumberComboBoxSize.getSelectedIt=
em().toString());
table.setRowHeight(fontSize);
table.setFont(new Font("Serif", Font.BOLD, fontSize));
Rectangle rect = table.getCellRect(0,0,true);
panel.setX(0);
panel.setY(0);
// panel.setWidth(rect.width);
panel.setHeight(rect.height);
panel.setStr(table.getModel().getValueAt(0,0).toString());
panel.setModel(table);
panel.repaint();
table.revalidate();
}
private void printDebugData(JTable table) {
int numRows = table.getRowCount();
int numCols = table.getColumnCount();
javax.swing.table.TableModel model = table.getModel();
System.out.println("Value of data: ");
for (int i=0; i < numRows; i++) {
System.out.print(" row " + i + ":");
for (int j=0; j < numCols; j++) {
System.out.print(" " + model.getValueAt(i, j));
}
System.out.println();
}
System.out.println("--------------------------");
}
/*
* Adjust the widths of all the columns in the table
*/
public void adjustColumns()
{
TableColumnModel tcm = table.getColumnModel();
for (int i = 0; i < tcm.getColumnCount(); i++)
{
adjustColumn(i);
}
}
/*
* Adjust the width of the specified column in the table
*/
public void adjustColumn(final int column)
{
TableColumn tableColumn = table.getColumnModel().getColumn(column);
if (! tableColumn.getResizable()) return;
int columnHeaderWidth = getColumnHeaderWidth( column );
int columnDataWidth = getColumnDataWidth( column );
int preferredWidth = Math.max(columnHeaderWidth, columnDataWidth);
panel.setWidth(preferredWidth);
updateTableColumn(column, preferredWidth);
}
/*
* Calculated the width based on the column name
*/
private int getColumnHeaderWidth(int column)
{
TableColumn tableColumn = table.getColumnModel().getColumn(column);
Object value = tableColumn.getHeaderValue();
TableCellRenderer renderer = tableColumn.getHeaderRenderer();
if (renderer == null)
{
renderer = table.getTableHeader().getDefaultRenderer();
}
Component c = renderer.getTableCellRendererComponent(table, value, fals=
e, false, -1, column);
return c.getPreferredSize().width;
}
/*
* Calculate the width based on the widest cell renderer for the
* given column.
*/
private int getColumnDataWidth(int column)
{
int preferredWidth = 0;
int maxWidth = table.getColumnModel().getColumn(column).getMaxWidth();
for (int row = 0; row < table.getRowCount(); row++)
{
preferredWidth = Math.max(preferredWidth, getCellDataWidth(row, col=
umn));
// We've exceeded the maximum width, no need to check other rows
if (preferredWidth >= maxWidth)
break;
}
return preferredWidth;
}
/*
* Get the preferred width for the specified cell
*/
private int getCellDataWidth(int row, int column)
{
// Inovke the renderer for the cell to calculate the preferred width
TableCellRenderer cellRenderer = table.getCellRenderer(row, column);
Component c = table.prepareRenderer(cellRenderer, row, column);
int width = c.getPreferredSize().width + table.getIntercellSpacing().wi=
dth;
return width;
}
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/*
* Update the TableColumn with the newly calculated width
*/
private void updateTableColumn(int column, int width)
{
final TableColumn tableColumn = table.getColumnModel().getColumn(column=
);
if (! tableColumn.getResizable()) return;
width += spacing;
// Don't shrink the column width
width = Math.max(width, tableColumn.getPreferredWidth());
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columnSizes.put(tableColumn, new Integer(tableColumn.getWidth()));
table.getTableHeader().setResizingColumn(tableColumn);
tableColumn.setWidth(width);
}
/**
* Create the GUI and show it. For thread safety,
* this method should be invoked from the
* event-dispatching thread.
*/
private static void createAndShowGUI() {
//Create and set up the window.
JFrame frame = new JFrame("SimpleTableDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Create and set up the content pane.
SimpleTableDemo newContentPane = new SimpleTableDemo();
newContentPane.setOpaque(true); //content panes must be opaque
frame.setContentPane(newContentPane);
//Display the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
class Panel1 extends JPanel
{
int x;
int y;
int width;
int height;
String str;
JTable model;
public void setModel(JTable model)
{
this.model = model;
}
public void setX(int x)
{
this.x = x;
}
public void setY(int y)
{
this.y = y;
}
public void setWidth(int w)
{
this.width = w;
}
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public void setHeight(int h)
{
this.height = h;
}
public void setStr(String s)
{
this.str = s;
}
public void paint(Graphics g)
{
super.paint(g);
int initX= 0;
for(int row=0;row < 5; ++row)
{
initX = x;
for (int col=0;col < 5;++col)
{
g.drawRect(x,y,width,height);
g.drawString(model.getModel().getValueAt(row,col).toString(),x + 10,y +=
10);
x = x + width;
}
x = initX;
y = y + height;
}
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}
};
Please help to redraw a JTable cell row and height on JPanel.
Thanks,
Keto