Node Layout in Java

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Node Layout
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Listing 17-6
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Filling the Background of a Container
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var scene:Scene; Stage { title : Tile #9 scene: scene = Scene { width: 400 height: 200 fill: ColorBLACK var t:Tile; content: [ t = Tile { hgap: 5 vgap: 5 width: bind scenewidth height: bind sceneheight content: [ Rectangle { fill: LinearGradient { startX: 00 endX: 10 startY: 00 endY: 00 stops: [ Stop { offset: 00 color: ColorLIGHTGRAY } Stop { offset: 10 color: ColorGREY } ] } managed: false width: bind twidth height: bind theight } ImageView { image: Image { url: {__DIR__}images/img1jpg } } ImageView { image: Image { url: {__DIR__}images/img2jpg } } ImageView { image: Image { url: {__DIR__}images/img4jpg } } ImageView {
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17 Coordinates, Transforms, and Layout
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image: Image { url: {__DIR__}images/img5jpg } } ImageView { image: Image { url: {__DIR__}images/img6jpg } } ] } ] } }
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In this example, the container whose background we want to fill is a Tile containing five imagesThe size of the Tile is bound to that of its enclosing scene so that it grows and shrinks as the stage is resizedThe rectangle containing the background fill is added to the Tile s content sequence on lines 16 to 32As you can see, it is the first element in the sequence, and its size is bound to that of the TileThe most important part of this code is line 27, which sets the managed variable of this object to false, which excludes it from the layout policy of the container, with the result that the Tile will not attempt to changes its size or positionYou can see the result in Figure 17-53
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Figure 17-53
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Using an unmanaged rectangle to provide a background for a Tile container
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The ClipView Node
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manages a single child, displaying all or part of it, depending on the relative sizes of the child and the ClipView If the child is larger than the ClipView, only a portion of it will be visible at any given time By varying the values of the clipX and clipY variables of the ClipView, it is possible to make it behave as a moving window through which a part of its child node can be seen If the ClipView is pannable (which it is, by default), the user can use the mouse to move the ClipView window and therefore bring a different reClipView
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Node Layout
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gion of the child node into view Unlike the other classes in this section, ClipView is a custom node, not a container The variables of the ClipView class are listed in Table 17-13
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Table 17-13 Variable
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node
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Variables of the ClipView Class Type
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Default
Description
The node to be displayed by the
ClipView
clipX
Number
The x coordinate of the location in the child node that will be placed at the top left of the ClipView The y coordinate of the location in the child node that will be placed at the top left of the ClipView Whether the user can move the ClipView window over the child node The largest possible value of
clipX
clipY
Number
pannable
Boolean
true
maxClipX
Number
maxClipY
Number
The largest possible value of
clipY
Listing 17-7 shows a typical example of the use of the ClipView class
Listing 17-7
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Using the ClipView Class
var scene:Scene; def margin = 10; Stage { title : ClipView #1 scene: scene = Scene { width: 200 height: 200 fill: ColorBLACK content: [ ClipView { layoutX: margin layoutY: margin width: bind scenewidth - 2 * margin height: bind sceneheight - 2 * margin node: ImageView {
17 Coordinates, Transforms, and Layout
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image: Image { url: {__DIR__}images/PortsmouthJPG } } } ] } }
This code creates a ClipView width of a child ImageView containing an image that is much larger than the ClipView itselfThe ClipView is placed in the scene with its top corner at coordinates (10, 10) and sized so that there is a 10-pixel margin around it Notice that the ClipView is placed by using the layoutX and layoutY variables instead of translateX and translateYAs noted earlier in this chapter, this is the conventional way to apply layout positioning to a nodeYou can see the result of this code on the left of Figure 17-54
Figure 17-54