Check the closed property of a window to test whether a window has been closed. To simply hide a window from view, set the NativeWindow. If the Nativeapplication. Any windows that have an owner are closed when the owner is closed. The owned windows do not dispatch a closing event and hence cannot prevent closure. A close event is dispatched. When a window uses system chrome, user interaction with the window can be canceled by listening for, and canceling the default behavior of the appropriate events.
For example, when a user clicks the system chrome close button, the closing event is dispatched. If any registered listener calls the preventDefault method of the event, then the window does not close. When a window does not use system chrome, notification events for intended changes are not automatically dispatched before the change is made. Hence, if you call the methods for closing a window, changing the window state, or set any of the window bounds properties, the change cannot be canceled.
To notify components in your application before a window change is made, your application logic can dispatch the relevant notification event using the dispatchEvent method of the window. For example, the following logic implements a cancelable event handler for a window close button:. The dispatchEvent method returns false if the event preventDefault method is called by a listener. However, it can also return false for other reasons, so it is better to explicitly use the isDefaultPrevented method to test whether the change should be canceled.
To maximize the window, use the NativeWindow maximize method. To minimize the window, use the NativeWindow minimize method. To restore the window that is, return it to the size that it was before it was either minimized or maximized , use the NativeWindow restore method.
A window that has an owner is minimized and restored when the owning window is minimized or restored. No events are dispatched by the owned window when it is minimized because its owner is minimized.
On the Linux operating system, different window managers enforce different rules regarding setting the window display state:. If a maximum size is set for the window, then some windows do not allow a window to be maximized.
Some other window managers set the display state to maximized, but do not resize the window. In either of these cases, no display state change event is dispatched. Some window managers do not honor the window maximizable or minimizable settings. When a window uses system chrome, the chrome provides drag controls for resizing the window and moving around the desktop. If a window does not use system chrome you must add your own controls to allow the user to resize and move the window.
To allow a user to resize a window interactively, use the NativeWindow startResize method. When this method is called from a mouseDown event, the resizing operation is driven by the mouse and completes when the operating system receives a mouseUp event. When calling startResize , you pass in an argument that specifies the edge or corner from which to resize the window.
To set the window size programmatically, set the width , height , or bounds properties of the window to the desired dimensions. When you set the bounds, the window size and position can all be changed at the same time.
However, the order that the changes occur is not guaranteed. Some Linux window managers do not allow windows to extend outside the bounds of the desktop screen. In these cases, the final window size may be limited because of the order in which the properties are set, even though the net affect of the changes would otherwise have resulted in a legal window.
For example, if you change both the height and y position of a window near the bottom of the screen, then the full height change might not occur when the height change is applied before the y position change.
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Viewed 3k times. Is there a way to block the user from resizing the app window container? Thanks for the tips. Add a comment. Active Oldest Votes.
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