Use Component listener to ensure frame visibilities : JFrame Window « Swing « Java Tutorial






  1. Java Tutorial
  2. Swing
  3. JFrame Window
import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;

import javax.swing.JFrame;

public class Main extends ComponentAdapter {
  public void componentMoved(ComponentEvent evt) {
    Dimension size = Toolkit.getDefaultToolkit().getScreenSize();
    int x = evt.getComponent().getX();
    int y = evt.getComponent().getY();
    if (y < 0 ) {
      y = 0;
    }
    if (x < 0 ) {
      x = 0;
    }
    if (x > size.getWidth() - evt.getComponent().getWidth() ) {
      x = (int) size.getWidth() - evt.getComponent().getWidth();
    }
    if (y > size.getHeight() - evt.getComponent().getHeight() ) {
      y = (int) size.getHeight() - evt.getComponent().getHeight();
    }
    evt.getComponent().setLocation(x, y);
  }

  public static void main(String[] args) {
    JFrame frame = new JFrame("Window cannot be moved to hide part of it");
    frame.setSize(300,300);

    frame.addComponentListener(new Main());
    frame.setVisible(true);
  }
}








14.80.JFrame Window
14.80.1.Creating a WindowCreating a Window
14.80.2.Display a JFrame instanceDisplay a JFrame instance
14.80.3.Resizing and positioning a JFrameResizing and positioning a JFrame
14.80.4.Constants for JFrame window close actionConstants for JFrame window close action
14.80.5.Sizing Windows with ToolkitSizing Windows with Toolkit
14.80.6.Centering a WindowCentering a Window
14.80.7.Extending JFrame: Closing Frames by DefaultExtending JFrame: Closing Frames by Default
14.80.8.Exiting an Application When a JFrame Is Closed
14.80.9.JFrame with Label and Window Listener to Handle Closing the FrameJFrame with Label and Window Listener to Handle Closing the Frame
14.80.10.Handling JFrame Events
14.80.11.Specifying Window DecorationsSpecifying Window Decorations
14.80.12.Set Default window close operation
14.80.13.SetIconImages for JFrame
14.80.14.Creating a Titleless and Borderless JFrame
14.80.15.Close a JFrame under condition
14.80.16.Creating a Borderless Window
14.80.17.Creating Frames with a background image
14.80.18.Setting the Icon for a Frame
14.80.19.Getting All Created Frames in an Application
14.80.20.Removing the Title Bar of a Frame
14.80.21.Making a Frame Non-Resizable: use setResizable(false) to freeze a frame's size.
14.80.22.Use Component listener to ensure frame visibilities
14.80.23.Drag and move a frame from its content area
14.80.24.Disabling the Close Button on a JFrame
14.80.25.Maximize a JFrame
14.80.26.Make a JFrame always visible
14.80.27.Preventing a Window from Gaining the Focus
14.80.28.Getting the Child Components of a Container
14.80.29.Get Top Frame
14.80.30.Make a JInternalFrame a tool window
14.80.31.Move JInternalFrame To Front