Window Resize Event

Window Resize Event

How can I detect that a window has been resized?I can detect events such as WindowIconified,WindowDeiconified, WindowOpening, WindowClosing, etc., but not the resize event.

Figuring out how to detect a window resizing isn’t immediately obviousbecause you might expect the event to be represented by a WindowEvent.In fact, window resizing is just a specific instance of componentresizing, which is signalled by a ComponentEvent. TheComponentEvent.COMPONENT_RESIZED identifier indicates that a ComponentEventis signalling a resize. To receive the event, you must add aComponentListener to the window. Rather than implementing all themethods required by a ComponentListener, it will suffice to subclassComponenetAdapter, and override its componentResized()method. The following program shows how to do this, displaying thenew dimensions of a window as it is resized.

import java.awt.*;import java.awt.event.*;public class ResizeWindow extends Frame {  Label label;  public void showSize() {    label.setText(getWidth() + ", " + getHeight());  }  public ResizeWindow() {    label = new Label();    label.setAlignment(Label.CENTER);    add(label, BorderLayout.CENTER);    addComponentListener(new ComponentAdapter() {      public void componentResized(ComponentEvent e) {        ResizeWindow.this.showSize();      }    });  }  public static final void main(String[] args) {    Frame frame = new ResizeWindow();    WindowListener exitListener;    exitListener = new WindowAdapter() {      public void windowClosing(WindowEvent e) {        Window window = e.getWindow();        window.setVisible(false);        window.dispose();        System.exit(0);      }    };           frame.addWindowListener(exitListener);    frame.setSize(200, 200);    frame.setVisible(true);  }}

See also  Does It Make Sense to Splurge on a Laptop?

About Our Editorial Process

At DevX, we’re dedicated to tech entrepreneurship. Our team closely follows industry shifts, new products, AI breakthroughs, technology trends, and funding announcements. Articles undergo thorough editing to ensure accuracy and clarity, reflecting DevX’s style and supporting entrepreneurs in the tech sphere.

See our full editorial policy.

About Our Journalist