Calculates the baseline offset based on the first managed child. If there
is no such child, returns Node.getBaselineOffset().
Finds this Node, or the first sub-node, based on the given CSS selector.
If this node is a Parent, then this function will traverse down
into the branch until it finds a match. If more than one sub-node matches the
specified selector, this function returns the first of them.
For example, if a Node is given the id of "myId", then the lookup method can
be used to find this node as follows: scene.lookup("#myId");.
selector | The css selector of the node to find |
Node, which matches
the CSS selector, null if none is found.
Returns the node's minimum height for use in layout calculations. If the node is resizable, its parent should not resize its height any smaller than this value. If the node is not resizable, returns its layoutBounds height.
Layout code which calls this method should first check the content-bias of the node. If the node has a horizontal content-bias, then callers should pass in a width value that the minimum height should be based on. If the node has either a vertical or null content-bias, then the caller should pass in -1.
Node subclasses with a horizontal content-bias should honor the width parameter whether -1 or a positive value. All other subclasses may ignore the width parameter (which will likely be -1).
If Node's maxHeight(double) is lower than this number,
minHeight takes precedence. This means the Node should never be resized below minHeight.
width | the width that should be used if minimum height depends on it |
Returns the node's minimum width for use in layout calculations. If the node is resizable, its parent should not resize its width any smaller than this value. If the node is not resizable, returns its layoutBounds width.
Layout code which calls this method should first check the content-bias of the node. If the node has a vertical content-bias, then callers should pass in a height value that the minimum width should be based on. If the node has either a horizontal or null content-bias, then the caller should pass in -1.
Node subclasses with a vertical content-bias should honor the height parameter whether -1 or a positive value. All other subclasses may ignore the height parameter (which will likely be -1).
If Node's maxWidth(double) is lower than this number,
minWidth takes precedence. This means the Node should never be resized below minWidth.
height | the height that should be used if minimum width depends on it |
Returns the node's preferred height for use in layout calculations. If the node is resizable, its parent should treat this value as the node's ideal height within its range. If the node is not resizable, just returns its layoutBounds height, which should be treated as the rigid height of the node.
Layout code which calls this method should first check the content-bias of the node. If the node has a horizontal content-bias, then callers should pass in a width value that the preferred height should be based on. If the node has either a vertical or null content-bias, then the caller should pass in -1.
Node subclasses with a horizontal content-bias should honor the height parameter whether -1 or a positive value. All other subclasses may ignore the height parameter (which will likely be -1).
width | the width that should be used if preferred height depends on it |
Returns the node's preferred width for use in layout calculations. If the node is resizable, its parent should treat this value as the node's ideal width within its range. If the node is not resizable, just returns its layoutBounds width, which should be treated as the rigid width of the node.
Layout code which calls this method should first check the content-bias of the node. If the node has a vertical content-bias, then callers should pass in a height value that the preferred width should be based on. If the node has either a horizontal or null content-bias, then the caller should pass in -1.
Node subclasses with a vertical content-bias should honor the height parameter whether -1 or a positive value. All other subclasses may ignore the height parameter (which will likely be -1).
height | the height that should be used if preferred width depends on it |
This method is called by the assistive technology to request the value for an attribute.
This method is commonly overridden by subclasses to implement
attributes that are required for a specific role.
If a particular attribute is not handled, the super class implementation
must be called.
attribute | the requested attribute | |
parameters | optional list of parameters |
Diagram: Parent