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Class DefaultDesktopManager

java.lang.Object

javax.swing.DefaultDesktopManager

All Implemented Interfaces:: Serializable, DesktopManager

public class DefaultDesktopManager extends Object implements DesktopManager, Serializable

This is an implementation of the DesktopManager. It currently implements the basic behaviors for managing JInternalFrames in an arbitrary parent. JInternalFrames that are not children of a JDesktop will use this component to handle their desktop-like actions.

This class provides a policy for the various JInternalFrame methods, it is not meant to be called directly rather the various JInternalFrame methods will call into the DesktopManager.

Since:

1.2

See Also:

Constructor Summary

Constructor	Description
`DefaultDesktopManager()`	Constructs a `DefaultDesktopManager`.

Method Summary

Modifier and Type	Method	Description
`void`	`activateFrame(JInternalFrame f)`	This will activate f moving it to the front.
`void`	`beginDraggingFrame(JComponent f)`	This method is normally called when the user has indicated that they will begin dragging a component around.
`void`	`beginResizingFrame(JComponent f, int direction)`	This method is normally called when the user has indicated that they will begin resizing the frame.
`void`	`closeFrame(JInternalFrame f)`	Removes the frame, and, if necessary, the `desktopIcon`, from its parent.
`void`	`deactivateFrame(JInternalFrame f)`	Generally, indicate that this frame has lost focus.
`void`	`deiconifyFrame(JInternalFrame f)`	Removes the desktopIcon from its parent and adds its frame to the parent.
`void`	`dragFrame(JComponent f, int newX, int newY)`	Moves the visible location of the frame being dragged to the location specified.
`void`	`endDraggingFrame(JComponent f)`	This method signals the end of the dragging session.
`void`	`endResizingFrame(JComponent f)`	This method signals the end of the resize session.
`protected Rectangle`	`getBoundsForIconOf(JInternalFrame f)`	The `iconifyFrame()` code calls this to determine the proper bounds for the desktopIcon.
`protected Rectangle`	`getPreviousBounds(JInternalFrame f)`	Gets the normal bounds of the component prior to the component being maximized.
`void`	`iconifyFrame(JInternalFrame f)`	Removes the frame from its parent and adds its `desktopIcon` to the parent.
`void`	`maximizeFrame(JInternalFrame f)`	Resizes the frame to fill its parents bounds.
`void`	`minimizeFrame(JInternalFrame f)`	Restores the frame back to its size and position prior to a `maximizeFrame` call.
`void`	`openFrame(JInternalFrame f)`	Normally this method will not be called.
`protected void`	`removeIconFor(JInternalFrame f)`	Convenience method to remove the desktopIcon of f is necessary.
`void`	`resizeFrame(JComponent f, int newX, int newY, int newWidth, int newHeight)`	Calls `setBoundsForFrame` with the new values.
`void`	`setBoundsForFrame(JComponent f, int newX, int newY, int newWidth, int newHeight)`	This moves the `JComponent` and repaints the damaged areas.
`protected void`	`setPreviousBounds(JInternalFrame f, Rectangle r)`	Stores the bounds of the component just before a maximize call.
`protected void`	`setWasIcon(JInternalFrame f, Boolean value)`	Sets that the component has been iconized and the bounds of the `desktopIcon` are valid.
`protected boolean`	`wasIcon(JInternalFrame f)`	Returns `true` if the component has been iconized and the bounds of the `desktopIcon` are valid, otherwise returns `false`.

Methods declared in class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

DefaultDesktopManager

public DefaultDesktopManager()

Constructs a DefaultDesktopManager.

Method Details

openFrame

public void openFrame(JInternalFrame f)

Normally this method will not be called. If it is, it tries to determine the appropriate parent from the desktopIcon of the frame. Will remove the desktopIcon from its parent if it successfully adds the frame.

Specified by:: openFrame in interface DesktopManager
Parameters:: f - the JInternalFrame to be displayed

closeFrame

public void closeFrame(JInternalFrame f)

Removes the frame, and, if necessary, the desktopIcon, from its parent.

Specified by:: closeFrame in interface DesktopManager
Parameters:: f - the JInternalFrame to be removed

maximizeFrame

public void maximizeFrame(JInternalFrame f)

Resizes the frame to fill its parents bounds.

Specified by:: maximizeFrame in interface DesktopManager
Parameters:: f - the frame to be resized

minimizeFrame

public void minimizeFrame(JInternalFrame f)

Restores the frame back to its size and position prior to a maximizeFrame call.

Specified by:: minimizeFrame in interface DesktopManager
Parameters:: f - the JInternalFrame to be restored

iconifyFrame

public void iconifyFrame(JInternalFrame f)

Removes the frame from its parent and adds its desktopIcon to the parent.

Specified by:: iconifyFrame in interface DesktopManager
Parameters:: f - the JInternalFrame to be iconified

deiconifyFrame

public void deiconifyFrame(JInternalFrame f)

Removes the desktopIcon from its parent and adds its frame to the parent.

Specified by:: deiconifyFrame in interface DesktopManager
Parameters:: f - the JInternalFrame to be de-iconified

activateFrame

public void activateFrame(JInternalFrame f)

This will activate f moving it to the front. It will set the current active frame's (if any) IS_SELECTED_PROPERTY to false. There can be only one active frame across all Layers.

Specified by:: activateFrame in interface DesktopManager
Parameters:: f - the JInternalFrame to be activated

deactivateFrame

public void deactivateFrame(JInternalFrame f)

Description copied from interface: DesktopManager

Generally, indicate that this frame has lost focus. This is usually called after the JInternalFrame's IS_SELECTED_PROPERTY has been set to false.

Specified by:: deactivateFrame in interface DesktopManager
Parameters:: f - the JInternalFrame to be deactivated

beginDraggingFrame

public void beginDraggingFrame(JComponent f)

Description copied from interface: DesktopManager

This method is normally called when the user has indicated that they will begin dragging a component around. This method should be called prior to any dragFrame() calls to allow the DesktopManager to prepare any necessary state. Normally f will be a JInternalFrame.

Specified by:: beginDraggingFrame in interface DesktopManager
Parameters:: f - the JComponent being dragged

dragFrame

public void dragFrame(JComponent f, int newX, int newY)

Moves the visible location of the frame being dragged to the location specified. The means by which this occurs can vary depending on the dragging algorithm being used. The actual logical location of the frame might not change until endDraggingFrame is called.

Specified by:: dragFrame in interface DesktopManager
Parameters:: f - the JComponent being dragged; newX - the new x-coordinate; newY - the new y-coordinate

endDraggingFrame

public void endDraggingFrame(JComponent f)

Description copied from interface: DesktopManager

This method signals the end of the dragging session. Any state maintained by the DesktopManager can be removed here. Normally f will be a JInternalFrame.

Specified by:: endDraggingFrame in interface DesktopManager
Parameters:: f - the JComponent being dragged

beginResizingFrame

public void beginResizingFrame(JComponent f, int direction)

Description copied from interface: DesktopManager

This method is normally called when the user has indicated that they will begin resizing the frame. This method should be called prior to any resizeFrame() calls to allow the DesktopManager to prepare any necessary state. Normally f will be a JInternalFrame.

Specified by:: beginResizingFrame in interface DesktopManager
Parameters:: f - the JComponent being resized; direction - the direction

resizeFrame

public void resizeFrame(JComponent f, int newX, int newY, int newWidth, int newHeight)

Calls setBoundsForFrame with the new values.

Specified by:: resizeFrame in interface DesktopManager
Parameters:: f - the component to be resized; newX - the new x-coordinate; newY - the new y-coordinate; newWidth - the new width; newHeight - the new height

endResizingFrame

public void endResizingFrame(JComponent f)

Description copied from interface: DesktopManager

This method signals the end of the resize session. Any state maintained by the DesktopManager can be removed here. Normally f will be a JInternalFrame.

Specified by:: endResizingFrame in interface DesktopManager
Parameters:: f - the JComponent being resized

setBoundsForFrame

public void setBoundsForFrame(JComponent f, int newX, int newY, int newWidth, int newHeight)

This moves the JComponent and repaints the damaged areas.

Specified by:: setBoundsForFrame in interface DesktopManager
Parameters:: f - the JComponent being moved or resized; newX - the new x-coordinate; newY - the new y-coordinate; newWidth - the new width; newHeight - the new height

removeIconFor

protected void removeIconFor(JInternalFrame f)

Convenience method to remove the desktopIcon of f is necessary.

Parameters:: f - the JInternalFrame for which to remove the desktopIcon

getBoundsForIconOf

protected Rectangle getBoundsForIconOf(JInternalFrame f)

The iconifyFrame() code calls this to determine the proper bounds for the desktopIcon.

Parameters:: f - the JInternalFrame of interest
Returns:: a Rectangle containing bounds for the desktopIcon

setPreviousBounds

protected void setPreviousBounds(JInternalFrame f, Rectangle r)

Stores the bounds of the component just before a maximize call.

Parameters:: f - the component about to be resized; r - the normal bounds to be saved away

getPreviousBounds

protected Rectangle getPreviousBounds(JInternalFrame f)

Gets the normal bounds of the component prior to the component being maximized.

Parameters:: f - the JInternalFrame of interest
Returns:: the normal bounds of the component

setWasIcon

protected void setWasIcon(JInternalFrame f, Boolean value)

Sets that the component has been iconized and the bounds of the desktopIcon are valid.

Parameters:: f - the JInternalFrame of interest; value - a Boolean signifying if component has been iconized

wasIcon

protected boolean wasIcon(JInternalFrame f)

Returns true if the component has been iconized and the bounds of the desktopIcon are valid, otherwise returns false.

Parameters:: f - the JInternalFrame of interest
Returns:: true if the component has been iconized; otherwise returns false

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https://docs.oracle.com/en/java/javase/21/docs/api/java.desktop/javax/swing/DefaultDesktopManager.html