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lier in this chapter, which was the result of the mouse moving over overlapping nodes that have the same parent The node variable of the event is always set to the node to which the event is actually delivered in the case of events delivered to the rectangle, this variable refers to the rectangle, whereas for the propagated events delivered to the group, it refers to the Group However, the source variable always refers to the rectangleThis variable always refers to the leaf node that is directly under the mouse and which is the original source of the event Propagation of mouse events to the group node makes it possible for you to handle all such events by just registering handlers with the group rather than with each individual leaf nodeThe setting of the source variable ensures that the handlers at the group level can always determine which leaf node originated the event It is important to note, however, that events are delivered to the group only while the mouse is over a leaf node in that group and not while it is between nodesTherefore, if you move the mouse outside of the yellow rectangle and into the space between it and the other nodes, events are not delivered to the group until the mouse reenters one of the other nodes The rectangle in the middle of Figure 15-24 is a little different from the one in Figure 15-22 its fill is explicitly set to null on line 47 of Listing 15-13 Here is a typical stream of events resulting from moving the mouse from left to right over the left side of this rectangle:

No-fill rectangle enter (1000, 560) Group enter node: Group, source: Rectangle No-fill rectangle move (1000, 560) Group move node: Group, source: Rectangle No-fill rectangle exit (1010, 560) Group exit node: Group, source: Rectangle

Listing 2-6 Using the debugger to dump out value and reference types (continued)

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As you can see, the mouse enters and apparently exits the rectangle immediately after crossing the boundaryThat s because when a node has a null fill, the area that appears to be its interior is considered to be outside of its boundary, and no mouse events will be delivered to it while the mouse is over that area Note that this only happens if the fill is null if the rectangle (or any other shape) were to be filled with a transparent color, or even if the rectangle were made transparent by setting its opacity value to 0 or using the color ColorTRANSPARENT, the interior would still be considered to be filled and mouse events will be delivered However, if the rectangle is hidden by setting its visible variable to false, no mouse events at all will be delivered to it Mouse Events and the pickOnBounds Variable By default, the boundary used to determine when the mouse is inside a node is its visual boundary In the case of a circle, for example, the mouse is considered to be inside the shape when it is over its edge or inside the drawn area of the circleYou can change this behavior by setting the pickOnBounds variable of the node to trueThe effect of this is to make the rectangular area enclosing the shape, the boundary for reporting mouse entry and exit events In the case of a circle, this would mean that the mouse would be considered to be over the shape whenever it is inside the rectangular area defined by the circle s

left, right, top, and bottom edgesThis is usually not what you want, but it is useful for Text nodes In the case of a Text node, unlike other shapes, the pickOnBounds variable is true by default, with the result that mouse events are delivered to it whenever the mouse is over the rectangular area occupied by the textYou can see why this is useful if you set the pickOnBounds variable for a Text node to false, as has been done on line 74 of Listing 15-13 Here s a stream of events generated by moving the mouse over part of the Text node (For clarity, the events delivered to the group have been omitted)

Expands on SSI by allowing conditions to be attached to directives, definition of variables by the user, and extension of external programs and CGIs

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