The doLayout() Function of the FXBorder Class in Java

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The doLayout() Function of the FXBorder Class
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protected override function doLayout():Void { buildPositionMap(); // Place the north node var topSpace = 00; var node = getNodeAt(FXPositionNORTH); if (node != null) {
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If you call the requestLayout() function of a container or a group, not only will it arrange for its own layout to be recalculated, but it will also call the requestLayout() function of its parent This will propagate all the way up to the owning scene 3 This code can be found in the file javafxnodes/RadialGradient2fx
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topSpace = Mathmin(height, getNodePrefHeight(node)); layoutNode(node, 0, 0, width, topSpace, nodeHPos, nodeVPos); topSpace += vgap; } // Place the south node var bottomSpace = 00; node = getNodeAt(FXPositionSOUTH); if (node != null) { bottomSpace = Mathmin(height, getNodePrefHeight(node)); layoutNode(node, 0, Mathmax(0, height - bottomSpace), width, bottomSpace, nodeHPos, nodeVPos); bottomSpace += vgap; } // Place the west and east nodes var centerHeight = height - topSpace - bottomSpace; var westSpace = 00; node = getNodeAt(FXPositionWEST); if (node != null) { westSpace = Mathmin(width, getNodePrefWidth(node)); layoutNode(node, 0, topSpace, westSpace, centerHeight, nodeHPos, nodeVPos); westSpace += hgap; } var eastSpace = 00; node = getNodeAt(FXPositionEAST); if (node != null) { eastSpace = Mathmin(width, getNodePrefWidth(node)); layoutNode(node, Mathmax(0, width - eastSpace), topSpace, eastSpace, centerHeight, nodeHPos, nodeVPos); eastSpace += hgap; } // Place the center node node = getNodeAt(FXPositionCENTER); if (node != null) { layoutNode(node, westSpace, topSpace, Mathmax(0, width - eastSpace - westSpace), Mathmax(0, height - topSpace - bottomSpace), nodeHPos, nodeVPos); } }
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This code consists of five similar blocks, one for each layout position Because the code in each block is similar, we ll look only at how the node in the north position is managed The diagram in Figure 25-5 shows how the nodes will be placed, assuming that all the layout positions are used
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Width
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Top space
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North
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Height vgap West Center East
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South Bottom space
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Figure 25-5
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Laying out the child nodes of the FXBorder container
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The code that handles the node in the north position is shown on lines 5 to 11 of Listing 25-4The variable topSpace is used to hold the assigned height of this node, which is the smaller of the node s preferred height and the height of the container itself Its width is always the full width of the containerThe actual positioning and sizing of the node is performed by the code on lines 8 to 10, which uses the layoutNode() function This is one of several script functions provided by the Container class that you can use to set the location/size of a node, some of which are listed here:
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public function positionNode(node:Node, x:Number, y:Number); public function positionNode(node:Node, x:Number, y:Number, width:Number, height:Number); public function setNodeHeight(node:Node, height:Number):Boolean; public function setNodeWidth(node:Node, width:Number):Boolean;
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public function resizeNode(node:Node, width:Number, height:Number):Boolean; public function layoutNode(node:Node, x:Number, y:Number, width:Number, height:Number):Boolean; public function layoutNode(node:Node, areaX:Number, areaY:Number, areaW:Number, area:Number, hpos:HPos, vpos:VPos):Boolean;
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The positionNode() functions move a node to a given location without changing its size, the setNodeHeight() and setNodeWidth() functions changes the size of a node without moving it, while the layoutNode() functions both move and resize the node Here, we discuss only the last of these functions, both because it is the most general and because it is the one that is used in the implementation of the FXBorder class Here s how we use this function to place the node in the north position of the container:
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layoutNode(node, 0, 0, width, topSpace, nodeHPos, nodeVPos);
The first five arguments specify the node and the bounds of the area in which it is to placed, relative to its parent container Here, the area is anchored at the origin of the FXBorder container, it has the same width as the container, and its height is given by the value of the topSpace variable, as computed earlierThe remaining two arguments control the positioning of the node within this areaWe need to tell the layoutNode() function how to position the node because it may not be possible to resize it so that it fills all the available space, or the node might not want to be resizedAny node that is not Resizable, such as the text nodes used in Listing 25-2, will always have a fixed size, which may be smaller than the space available, whereas it may be possible to set the width and height of a Resizable object, such as a Button, so that it occupies all the allocated area However, if a Resizable has a maximum height/width that is smaller than the height and width of the area in which it has been placed, it will not be resized beyond its maximum sizes4 Whether a node is expanded to fill the layout area depends on the following factors:
The value returned by its getVFill() for vertical fill and getHFill() functions The values of the vfill and hfill variables of the node s layoutInfo object, if it has one, which take precedence over the values returned by the node functions
The layoutNode() function takes these values into account, so you don t need to code this logic into your container implementation
Recall from 17 that the maximum width of a resizable node can be set either by overriding its getMaxWidth() function or by setting the maxWidth variable of a LayoutInfo object and installing in the node s layoutInfo variable