IT. Expert System.

Java Standard Edition (SE)

WindowEvent


java.awt.event

Class WindowEvent

  • All Implemented Interfaces:
    Serializable


    public class WindowEvent
    extends ComponentEvent
    A low-level event that indicates that a window has changed its status. This low-level event is generated by a Window object when it is opened, closed, activated, deactivated, iconified, or deiconified, or when focus is transfered into or out of the Window.

    The event is passed to every WindowListener or WindowAdapter object which registered to receive such events using the window's addWindowListener method. (WindowAdapter objects implement the WindowListener interface.) Each such listener object gets this WindowEvent when the event occurs.

    An unspecified behavior will be caused if the id parameter of any particular WindowEvent instance is not in the range from WINDOW_FIRST to WINDOW_LAST.

    Since:
    JDK1.1
    See Also:
    WindowAdapter, WindowListener, Tutorial: Writing a Window Listener, Serialized Form
    • Field Detail

      • WINDOW_FIRST

        public static final int WINDOW_FIRST
        The first number in the range of ids used for window events.
        See Also:
        Constant Field Values
      • WINDOW_OPENED

        @Native
        public static final int WINDOW_OPENED
        The window opened event. This event is delivered only the first time a window is made visible.
        See Also:
        Constant Field Values
      • WINDOW_CLOSING

        @Native
        public static final int WINDOW_CLOSING
        The "window is closing" event. This event is delivered when the user attempts to close the window from the window's system menu. If the program does not explicitly hide or dispose the window while processing this event, the window close operation will be cancelled.
        See Also:
        Constant Field Values
      • WINDOW_ICONIFIED

        @Native
        public static final int WINDOW_ICONIFIED
        The window iconified event. This event is delivered when the window has been changed from a normal to a minimized state. For many platforms, a minimized window is displayed as the icon specified in the window's iconImage property.
        See Also:
        Frame.setIconImage(java.awt.Image), Constant Field Values
      • WINDOW_DEICONIFIED

        @Native
        public static final int WINDOW_DEICONIFIED
        The window deiconified event type. This event is delivered when the window has been changed from a minimized to a normal state.
        See Also:
        Constant Field Values
      • WINDOW_ACTIVATED

        @Native
        public static final int WINDOW_ACTIVATED
        The window-activated event type. This event is delivered when the Window becomes the active Window. Only a Frame or a Dialog can be the active Window. The native windowing system may denote the active Window or its children with special decorations, such as a highlighted title bar. The active Window is always either the focused Window, or the first Frame or Dialog that is an owner of the focused Window.
        See Also:
        Constant Field Values
      • WINDOW_DEACTIVATED

        @Native
        public static final int WINDOW_DEACTIVATED
        The window-deactivated event type. This event is delivered when the Window is no longer the active Window. Only a Frame or a Dialog can be the active Window. The native windowing system may denote the active Window or its children with special decorations, such as a highlighted title bar. The active Window is always either the focused Window, or the first Frame or Dialog that is an owner of the focused Window.
        See Also:
        Constant Field Values
      • WINDOW_GAINED_FOCUS

        @Native
        public static final int WINDOW_GAINED_FOCUS
        The window-gained-focus event type. This event is delivered when the Window becomes the focused Window, which means that the Window, or one of its subcomponents, will receive keyboard events.
        See Also:
        Constant Field Values
      • WINDOW_LOST_FOCUS

        @Native
        public static final int WINDOW_LOST_FOCUS
        The window-lost-focus event type. This event is delivered when a Window is no longer the focused Window, which means keyboard events will no longer be delivered to the Window or any of its subcomponents.
        See Also:
        Constant Field Values
      • WINDOW_STATE_CHANGED

        @Native
        public static final int WINDOW_STATE_CHANGED
        The window-state-changed event type. This event is delivered when a Window's state is changed by virtue of it being iconified, maximized etc.
        Since:
        1.4
        See Also:
        Constant Field Values
      • WINDOW_LAST

        public static final int WINDOW_LAST
        The last number in the range of ids used for window events.
        See Also:
        Constant Field Values
    • Constructor Detail

      • WindowEvent

        public WindowEvent(Window source,
                           int id,
                           Window opposite,
                           int oldState,
                           int newState)
        Constructs a WindowEvent object.

        This method throws an IllegalArgumentException if source is null.

        Parameters:
        source - The Window object that originated the event
        id - An integer indicating the type of event. For information on allowable values, see the class description for WindowEvent
        opposite - The other window involved in the focus or activation change, or null
        oldState - Previous state of the window for window state change event. See #getOldState() for allowable values
        newState - New state of the window for window state change event. See #getNewState() for allowable values
        Throws:
        IllegalArgumentException - if source is null
        Since:
        1.4
        See Also:
        getWindow(), AWTEvent.getID(), getOppositeWindow(), getOldState(), getNewState()
      • WindowEvent

        public WindowEvent(Window source,
                           int id,
                           Window opposite)
        Constructs a WindowEvent object with the specified opposite Window. The opposite Window is the other Window involved in this focus or activation change. For a WINDOW_ACTIVATED or WINDOW_GAINED_FOCUS event, this is the Window that lost activation or focus. For a WINDOW_DEACTIVATED or WINDOW_LOST_FOCUS event, this is the Window that gained activation or focus. If this focus change occurs with a native application, with a Java application in a different VM, or with no other Window, then the opposite Window is null.

        This method throws an IllegalArgumentException if source is null.

        Parameters:
        source - The Window object that originated the event
        id - An integer indicating the type of event. For information on allowable values, see the class description for WindowEvent. It is expected that this constructor will not be used for other then WINDOW_ACTIVATED,WINDOW_DEACTIVATED, WINDOW_GAINED_FOCUS, or WINDOW_LOST_FOCUS. WindowEvent types, because the opposite Window of other event types will always be null.
        opposite - The other Window involved in the focus or activation change, or null
        Throws:
        IllegalArgumentException - if source is null
        Since:
        1.4
        See Also:
        getWindow(), AWTEvent.getID(), getOppositeWindow()
      • WindowEvent

        public WindowEvent(Window source,
                           int id,
                           int oldState,
                           int newState)
        Constructs a WindowEvent object with the specified previous and new window states.

        This method throws an IllegalArgumentException if source is null.

        Parameters:
        source - The Window object that originated the event
        id - An integer indicating the type of event. For information on allowable values, see the class description for WindowEvent. It is expected that this constructor will not be used for other then WINDOW_STATE_CHANGED WindowEvent types, because the previous and new window states are meaningless for other event types.
        oldState - An integer representing the previous window state. See #getOldState() for allowable values
        newState - An integer representing the new window state. See #getNewState() for allowable values
        Throws:
        IllegalArgumentException - if source is null
        Since:
        1.4
        See Also:
        getWindow(), AWTEvent.getID(), getOldState(), getNewState()
      • WindowEvent

        public WindowEvent(Window source,
                           int id)
        Constructs a WindowEvent object.

        This method throws an IllegalArgumentException if source is null.

        Parameters:
        source - The Window object that originated the event
        id - An integer indicating the type of event. For information on allowable values, see the class description for WindowEvent.
        Throws:
        IllegalArgumentException - if source is null
        See Also:
        getWindow(), AWTEvent.getID()
    • Method Detail

      • getWindow

        public Window getWindow()
        Returns the originator of the event.
        Returns:
        the Window object that originated the event
      • getOppositeWindow

        public Window getOppositeWindow()
        Returns the other Window involved in this focus or activation change. For a WINDOW_ACTIVATED or WINDOW_GAINED_FOCUS event, this is the Window that lost activation or focus. For a WINDOW_DEACTIVATED or WINDOW_LOST_FOCUS event, this is the Window that gained activation or focus. For any other type of WindowEvent, or if the focus or activation change occurs with a native application, with a Java application in a different VM or context, or with no other Window, null is returned.
        Returns:
        the other Window involved in the focus or activation change, or null
        Since:
        1.4
      • getOldState

        public int getOldState()
        For WINDOW_STATE_CHANGED events returns the previous state of the window. The state is represented as a bitwise mask.
        • NORMAL
          Indicates that no state bits are set.
        • ICONIFIED
        • MAXIMIZED_HORIZ
        • MAXIMIZED_VERT
        • MAXIMIZED_BOTH
          Concatenates MAXIMIZED_HORIZ and MAXIMIZED_VERT.
        Returns:
        a bitwise mask of the previous window state
        Since:
        1.4
        See Also:
        Frame.getExtendedState()
      • getNewState

        public int getNewState()
        For WINDOW_STATE_CHANGED events returns the new state of the window. The state is represented as a bitwise mask.
        • NORMAL
          Indicates that no state bits are set.
        • ICONIFIED
        • MAXIMIZED_HORIZ
        • MAXIMIZED_VERT
        • MAXIMIZED_BOTH
          Concatenates MAXIMIZED_HORIZ and MAXIMIZED_VERT.
        Returns:
        a bitwise mask of the new window state
        Since:
        1.4
        See Also:
        Frame.getExtendedState()
      • paramString

        public String paramString()
        Returns a parameter string identifying this event. This method is useful for event-logging and for debugging.
        Overrides:
        paramString in class ComponentEvent
        Returns:
        a string identifying the event and its attributes


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