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我正在編寫一個應用程序，我必須在畫布上繪製JTable組件。但是，我的幾次嘗試仍然無法繪製JTable的完美圖片。我試圖使用getCellRect api繪製使用JTable的特定單元格的大小，但是當數據很大時，無法在畫布上繪製特定的單元格。下面是示例代碼： -在Panel上繪製JTable行和列
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 Integer(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 String[] { "11", "12", "14", "16", "18", "20", "24", "30", "36", "48", "72" }));
jNumberComboBoxSize.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jNumberComboBoxSizeActionPerformed(jNumberComboBoxSize);
}
});
JPanel panel2 = new JPanel();
panel2.add(jNumberComboBoxSize);
add(panel2);
adjustColumns();
}
private void jNumberComboBoxSizeActionPerformed(JComboBox jNumberComboBoxSize)
{
int fontSize = Integer.parseInt(jNumberComboBoxSize.getSelectedItem().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, false, 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, column));
// 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().width;
return width;
}
/*
* 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());
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;
}
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;
}
}
};
我修改這個代碼重繪柱細胞與字體大小和邊界。我想繪製所有這些表格自定義，請看看並提出一些建議。
感謝
SimpleTableDemo.java
package com.swing.data;
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.Rectangle;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.HashMap;
import java.util.Map;
import javax.swing.BorderFactory;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;
import javax.swing.table.TableColumnModel;
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 Integer(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)}
};
JTable table = new JTable(data, columnNames);
Panel1 panel;
public SimpleTableDemo()
{
super(new GridLayout(3,0));
table.setPreferredScrollableViewportSize(new Dimension(500, 70));
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 String[] { "11", "12", "14", "16", "18", "20", "24", "30", "36", "48", "72" }));
jNumberComboBoxSize.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jNumberComboBoxSizeActionPerformed(jNumberComboBoxSize);
}
});
JPanel panel2 = new JPanel();
panel2.add(jNumberComboBoxSize);
add(panel2);
adjustColumns();
}
private void jNumberComboBoxSizeActionPerformed(JComboBox jNumberComboBoxSize)
{
int fontSize = Integer.parseInt(jNumberComboBoxSize.getSelectedItem().toString());
table.setRowHeight(fontSize);
setBorder(new Font("Serif", Font.BOLD, fontSize));
table.setFont(new Font("Serif", Font.BOLD, fontSize));
panel.setFont(new Font("Serif", Font.BOLD, fontSize));
Rectangle rect = table.getCellRect(0,0,true);
panel.setX(0);
panel.setY(0);
panel.setHeight(rect.height);
panel.setStr(table.getModel().getValueAt(0,0).toString());
panel.setModel(table);
panel.repaint();
table.revalidate();
}
public void setBorder(Font f)
{
BorderCellRenderer cellRenderer = new BorderCellRenderer();
cellRenderer.setColumnBorder(BorderFactory.createLineBorder(Color.BLACK, 2));
cellRenderer.setFont(f);
table.getColumnModel().getColumn(0).setCellRenderer(cellRenderer);
table.getColumnModel().getColumn(1).setCellRenderer(cellRenderer);
}
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(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, false, 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, column));
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().width;
return width;
}
/*
* 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());
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();
}
});
}
}
**Panel1.java**
package com.swing.data;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Rectangle;
import javax.swing.JPanel;
import javax.swing.JTable;
class Panel1 extends JPanel
{
int x;
int y;
int width;
int height;
String str;
JTable model;
Font font;
public Font getFont() {
return font;
}
public void setFont(Font font) {
this.font = font;
}
public void setModel(JTable model)
{
this.model = model;
}
public JTable getModel()
{
return 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;
}
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);
// String str = model.getModel().getValueAt(row, col).toString();
// int xloc = (x+10);
// int yloc = y +10;
//// System.out.println("xloc : "+xloc);
//// System.out.println("yloc : "+yloc);
//// System.out.println("width : "+width);
//// System.out.println("height : "+height);
//// System.out.println("str : "+str);
//
// g.drawString(model.getModel().getValueAt(row,col).toString(),x + 10,y + 10);
// x = x + width;
// }
// x = initX;
// y = y + height;
//
// }
System.out.println("Inside paint() >>>>>>>>>>>>>>>>>>>>>");
JTable table = getModel();
int columnCount = table.getModel().getColumnCount();
int rowCount = table.getModel().getRowCount();
int yLoc = 10;
int rowHeight = 0 ;
int columnWidth = 0 ;
g.setFont(font);
for(int r = 0 ; r < rowCount; r++)
{
int xLoc = 0 ;
for(int c= 0 ; c< columnCount; c++)
{
Rectangle rect = table.getCellRect(r, c, true);
columnWidth = rect.width;
rowHeight = rect.height;
g.drawRect(xLoc, yLoc, columnWidth, rowHeight);
String displayString = table.getValueAt(r, c).toString();
System.out.println("displayString ::"+displayString);
g.drawString(displayString, xLoc+5, yLoc+15);
xLoc+= columnWidth;
}
yLoc+= rowHeight;
}
}
}
**BorderCellRenderer.java**
package com.swing.data;
import java.awt.*;
import javax.swing.*;
import javax.swing.table.*;
import javax.swing.border.*;
/**
* @version 1.0 03/06/99
*/
public class BorderCellRenderer extends JLabel
implements TableCellRenderer {
protected Border noFocusBorder;
protected Border columnBorder;
protected Font font;
public Font getFont() {
return font;
}
public void setFont(Font font) {
this.font = font;
}
public BorderCellRenderer() {
noFocusBorder = new EmptyBorder(1, 2, 1, 2);
setOpaque(true);
}
public Component getTableCellRendererComponent(JTable table, Object value,
boolean isSelected, boolean hasFocus, int row, int column) {
setText((value == null) ? "" : value.toString());
setBorder(columnBorder);
setFont(font);
return this;
}
public void setColumnBorder(Border border) {
columnBorder = border;
}
public Border getColumnBorder() {
return columnBorder;
}
}
請建議一些重繪適當JTable的字體和邊框。
跨貼在[此處]（https://groups.google.com/d/topic/comp.lang.java.programmer/S_tbTGoYeV8/discussion）。 – trashgod
:)我沒有看到畫布在哪裏？你的意思是繪製'java.awt.Canvas'？ –