Node.getSize ()?

Hi all

My Q is very simple...

How do I get the size (width / height) to a node?

I expect that there are: MyNode.getWidth () and MyNode.getHeight ()...
But they does NOT exist... or equivalent methods.

It's really ubnormal?

Thanks for any help...

The things that extend from region (for example, page layouts and controls) have width and height properties, so you can just do:

label.getWidth();

The nodes have different types of limits =>
http://docs.Oracle.com/JavaFX/2/API/JavaFX/scene/node.html#layoutBoundsProperty%28%29
http://docs.Oracle.com/JavaFX/2/API/JavaFX/scene/node.html#boundsInLocalProperty%28%29
http://docs.Oracle.com/JavaFX/2/API/JavaFX/scene/node.html#boundsInParentProperty%28%29

A simple program to illustrate that do this:
https://gist.github.com/1441960

In my words:
-Layout limits: the boundary of the shape.
-Delimits local: the boundary of the shape and the effect.
-Limits of Parent: the boundary of the shape, the effects and transformations.

Once you have the appropriate limits, you can query its width, height and depth.

For example:

node.getBoundsInParent().getWidth()

Note that if the node contains something resizable or css stylesheet, you really won't get a proper report to the limits until it was posted on a scene active and a pulse was performed on this subject. Thus, for example, the declared value for boundaries immediately after creating the node may differ from the value declared after that (scene) stage.show has been called. To always be informed of what is the height or width of a node, add a listener to the property of the appropriate limits, for example:

final DoubleProperty nodeWidth = new SimpleDoubleProperty(node.getWidth());
node.boundsInParentProperty().addListener(new ChangeListener() {
  @Override public void changed(ObservableValue ov, Bounds oldBounds, Bounds newBounds) {
    nodeWidth.set(newBounds.getWidth());
  }
});

Aspects of layout and controls have a property of convenience for this already, so you can do things like:

label.widthProperty().bind(scene.widthProperty());

Then there are things that calculates the preferred, minimum and maximum amounts for the nodes based on a given width or height. For nodes in constant sizes, these will always return the same value for resizable nodes, they can return different values. These should be used when in the subclassed layoutChildren call you create your own composite nodes (i.e. not so often and never if you are a beginner to write JavaFX programs).

node.minWidth(height)  // minimum width for a given height.
node.prefWidth(height)
node.maxWidth(height)

Finally resizable nodes that extend the region as part of layout and controls have the following properties, which you will likely finish by using a little:

region.minWidthProperty()
region.prefWidthProperty()
region.maxWidthProperty()

For example region.getMaxWidth will return either
-Region.USE_PREF_SIZE-online maximum width will be the same as the default width.
-Region.USE_COMPUTED_SIZE-online maximum width will be of what is implemented in the default region.
-Some absolute value-online the maximum width will be all that a caller has chosen via region.setMaxWidth (value) call.
-Double.MAX_VALUE-online unlimited maximum width.

A good layout strategy is not to worry about sizes much at all, instead use resizable controls inside layout managers and set a default size of resizable controls only when you need to.

Tags: Java

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