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Description
The overall vertical alignment of each flow within the height of the container The horizontal alignment of each node within its assigned space Applies only when vertical is true The vertical alignment of each node within its assigned space Applies only when vertical is false
nodeHPos
HPos
HPosCENTER
nodeVPos
VPos
VPosCENTER
Horizontal and Vertical Flows A Flow container provides either a horizontal or vertical layout depending on the value of the vertical variable By default, it lays out its children in rows, in the order in which they appear in its content sequence, giving each node its preferred width and height9 The code in Listing 17-1 demonstrates the use of a horizontal Flow container to position six Image nodes, giving the result shown in Figure 17-34
Figure 17-34
A Flow container providing a horizontal layout
As you ll see later in this section, Flow does not grow or shrink layout areas, but it can be instructed to expand Resizables horizontally/vertically so that they fill their layout areas
Node Layout
Listing 17-1
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39
Creating a Horizontal Layout with a Flow Container
var scene:Scene; Stage { title: Flow #1 width: 400 height: 300 scene: scene = Scene { fill: ColorGRAY content: [ Flow { width: bind scenewidth height: bind sceneheight padding: Insets { top: 4 left: 4 bottom: 4 right: 4} hgap: 8 vgap: 8 content: [ ImageView { image: Image {url: {__DIR__}images/img1jpg } }, ImageView { image: Image {url: {__DIR__}images/img2jpg } }, ImageView { image: Image {url: {__DIR__}images/img3jpg } }, ImageView { image: Image {url: {__DIR__}images/img4jpg } }, ImageView { image: Image {url: {__DIR__}images/img5jpg } }, ImageView { image: Image {url: {__DIR__}images/img6jpg } }, ] } ] } }
On lines 10 and 11 of this example, the width and height variables of the Flow are bound to those of its containing scene, which means that it will resize automatically if the stage is resized by the userAs you can see, the nodes are arranged in rows Because there is not enough room to fit everything into a single row, the last two images are placed on a
17 Coordinates, Transforms, and Layout
separate row below the first one If the width or height of the Flow is changed (for example, by resizing the stage), the layout will be recalculated, which may result in nodes being moved between rows or rows being added or removed The distance between the nodes in a row is controlled by the hgap variable, which, in this case, is set to provide an 8-pixel gapWhen more than one row is needed, the distance between rows is determined by the value of the vgap variable, which, in this example, is also 8 pixels The behavior of the Flow container when the vertical variable has the value true is similar, except that the nodes are arranged in columns rather than rowsThe result of making this change to the code in Listing 17-1 is shown in Figure 17-35
Figure 17-35
A Flow container providing a vertical layout
As you can see, there is insufficient space to accommodate all the nodes in one column, so a second one has been created In the case of a vertical layout, the vgap variable controls the vertical distance between nodes in a column, and the hgap variable specifies the horizontal distance between successive columns Flow Alignment The hpos and vpos variables can be used to control how the flows of nodes are aligned relative to the bounds of the Flow container If you look back to Figure 17-34, you ll see that the nodes in the second row, which is not full, are aligned to the left of the container This is also true of the nodes on the first row, although it is not as obvious because that row is almost full In a horizontal layout, you can change this alignment by setting the hpos variable to one of the values defined by the javafxgeometryHPos classThe default is HPosLEFT, which accounts for the left alignment seen in Figure 17-34 Making