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In Figure 17-32, the scene has more vertical space than is required to place both of the controls, and both LayoutInfo objects permit space to be allocated to their respective nodes Because the vgrow variable for the second TextBox has value PriorityALWAYS, the VBox allocates all the extra space to the second layout area If there were more than one node with this setting, the additional space would have been shared by all of those nodes
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17 Coordinates, Transforms, and Layout
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Because the second layout area is larger than the space required for the second
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TextBox, the VBox has to decide where to place it within that areaThis is determined the values of the nodeHPos and nodeVPos variables of the VBox class, which are set on lines 13 and 14As you can see, nodeHPos is set to HPosTRAILING, which causes the TextBox to placed at the trailing edge of the container, while nodeVPos has the value VPosCENTER, which
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is consistent with the result shown in Figure 17-328 This is not quite the end of the story, howeverThe vgrow variable for the first layout area has value PrioritySOMETIMES, which means that it will be allocated extra space only if all the additional vertical space cannot be assigned to areas with value PriorityALWAYS In the case of this example, the second layout area will receive all the extra space until its height reaches 100 pixels, because of the value of the maxHeight variable on line 27 If the scene is resized vertically, you will eventually find that the second layout area will reach this height, at which point any extra vertical space is assigned to the first area, as shown in Figure 17-33
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Layout area 1
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Layout area 2 - height 100 pixels
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Figure 17-33
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Resizing of layout areas
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Before we start our discussion of the individual container types, it is worth noting again the difference between the fill and grow/shrink variables:
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The grow/shrink variables determine whether the layout area for a node will be expanded (or contracted) if there is more (or less) space in the container than is needed to place all of its child nodes The fill variables determine whether the node will be expanded or contracted to fit the space allocated to its layout areaThese variables have no effect if the node is not Resizable If the node is resized, it is always kept within the bounds specified by its minimum and maximum sizesWhen the node does not fill its layout area, its
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As you ll see when we discuss the individual container types in the sections that follow, the nodeHPos and nodeVPos values are defaults that apply to all the child nodes in the container, but they can be overridden for individual nodes by the hpos and vpos varaiables of a LayoutInfo object
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position within that area is controlled by the nodeHPos and nodeVPos variables of the container, which may be overridden by the hpos and vpos variables of a LayoutInfo object
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The Flow Container
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The Flow container arranges its child nodes either in rows or columns If there is insufficient space to place all the nodes into a row or column, those that remain are flowed over into another row or column (hence the name of the container) If you are a Swing developer, you will recognize Flow as the JavaFX equivalent of the FlowLayout layout manager The variables that control the behavior of Flow are listed in Table 17-8 and are explained in the sections that follow
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Table 17-8 Variable
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Variables of the Flow Class Type
Boolean
Access
Default
false
Description
Determines whether a vertical (true) or horizontal (false) layout of child Nodes is required Empty space to be left around the outside of the container Use this variable to create an empty border area in which nodes will not be placed The preferred width for a horizontal Flow or preferred height for a vertical Flow The horizontal gap between Nodes The vertical gap between Nodes The overall horizontal alignment of each flow within the width of the container