package org.xulescode.swing;
import java.awt.Dimension;
import java.awt.Toolkit;
/**
* Easy to focus a JFrame on screen or place where we want about the center example.
* Ejemplo sencillo para centrar un JFrame en pantalla o colocar donde queramos respecto al centro.
* @author xules
* You can follow me on my website http://www.codigoxules.org/en
* Puedes seguirme en mi web http://www.codigoxules.org
*/
public class JFrameCenterSimple extends javax.swing.JFrame {
/**
* Create a new form JFrameCenterSimple centered with respect to the screen
* Crea un nuevo form JFrameCenterSimple centrado con respecto a la pantalla.
*/
public JFrameCenterSimple() { initComponents();
setLocationCenter();
setVisible(true);
}
/**
* Create a new form JFrameCenterSimple centered with respect to the screen
* Crea un nuevo form JFrameCenterSimple centrado con respecto a la pantalla.
* @param moveWidth int positive or negative offset width (desplazamiente de width positivo o negativo).
* @param moveHeight int Positive or negative offset height (desplazamiento de height positivo o negativo).
*/
public JFrameCenterSimple(int moveWidth, int moveHeight) { initComponents();
setLocationMove(moveWidth, moveHeight);
setVisible(true);
}
/**
* Set the JFrame in the center of the screen.
* Colocamos nuestro JFrame en el centro de la pantalla.
*/
public void setLocationCenter(){ setLocationMove(0, 0);
}
/**
* Place the JFrame with the parameters by moving the component relative to the center of the screen.
* Colocamos el JFrame con los parámetros desplazando el componente respecto al centro de la pantalla.
* @param moveWidth int positive or negative offset width (desplazamiente de width positivo o negativo).
* @param moveHeight int Positive or negative offset height (desplazamiento de height positivo o negativo).
*/
public void setLocationMove(int moveWidth, int moveHeight) { // Obtenemos el tamaño de la pantalla.
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
// Obtenemos el tamaño de nuestro frame.
Dimension frameSize = this.getSize();
frameSize.width = frameSize.width > screenSize.width?screenSize.width:frameSize.width;
frameSize.height = frameSize.height > screenSize.height?screenSize.height:frameSize.height;
// We define the location. Definimos la localización.
setLocation((screenSize.width - frameSize.width) / 2 + moveWidth, (screenSize.height - frameSize.height) / 2 + moveHeight);
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked") // <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jTextField1 = new javax.swing.JTextField();
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
jTextField1.setText("jTextField1");
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setTitle("JFrame screen location (posicionamiento en pantalla)");
jLabel1.setFont(new java.awt.Font("Ubuntu", 1, 18)); // NOI18N
jLabel1.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
jLabel1.setText("Centramos el JFrame en la pantalla"); jLabel1.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER);
jLabel2.setFont(new java.awt.Font("Ubuntu", 1, 18)); // NOI18N
jLabel2.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
jLabel2.setText("Center the JFrame on the screen"); jLabel2.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap(107, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(jLabel2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jLabel1, javax.swing.GroupLayout.DEFAULT_SIZE, 312, Short.MAX_VALUE))
.addContainerGap(120, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addContainerGap(79, Short.MAX_VALUE)
.addComponent(jLabel2, javax.swing.GroupLayout.PREFERRED_SIZE, 70, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(59, 59, 59)
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 70, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(84, 84, 84))
);
pack();
}// </editor-fold>
/**
* @param args the command line arguments
*/
public static void main(String args[]) { /* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try { for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) { if ("Nimbus".equals(info.getName())) { javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) { java.util.logging.Logger.getLogger(JFrameCenterSimple.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) { java.util.logging.Logger.getLogger(JFrameCenterSimple.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) { java.util.logging.Logger.getLogger(JFrameCenterSimple.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) { java.util.logging.Logger.getLogger(JFrameCenterSimple.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() { public void run() { new JFrameCenterSimple(100, 200).setVisible(true);
new JFrameCenterSimple(-100, -200).setVisible(true);
new JFrameCenterSimple().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JTextField jTextField1;
// End of variables declaration
}
Comentarios sobre la versión: 1.0 (2)
En este ejemplo... Mi jFrame se llama jFRM_Menu, en la parte del public simplemente se pone "setLocationRelativeTo(null);" sin las comillas y debajo de initComponents(); como en el ejemplo de abajo:
public jFRM_Menu() {
initComponents();
setLocationRelativeTo(null);
}
Espero que le sea de utilidad a alguien más ya que me ha servido bastante ésta pequeña sección de código.
Saludos.