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The preferred height of the north node, or 0 if there is no north node The preferred height of the south node, or 0 if there is no south node The largest preferred height of the west, center, and east nodes, or 0 if none of these positions is occupied The gaps between the north node and the center area and between the center area and the south node
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To calculate the preferred height, we need to easily access the node for each layout position All the nodes are in the content sequence, so to locate the node at a given position, we would have to traverse this sequence, checking the layoutInfo variable of each nodeThis would be an expensive process, but we can speed it up by building a map from layout position (in the form of an FXPosition value) to the node at that position Once we have this map, we can easily get the node at any given location by using the corresponding FXPosition value as the key to the mapThe code that creates this map is shown in Listing 25-3
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Listing 25-3
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Creating a Map of Layout Position to Node for the FXBorder Class
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// Map from FXBorderPosition to node at that position var mapValid = false; var positionMap = HashMap {}; var hgaps = 0; var vgaps = 0;
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If you take on the challenge of implementing a padding variable for this container, ensure that the left and right insets are taken into account when computing the preferred width and the top and bottom insets in the case of the preferred height
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// Builds the map from FXBorderPosition to node Only one node is // allowed at each position function buildPositionMap():Void { if (not mapValid) { var verticalCount = 0; var horizontalCount = 0; positionMapclear(); for (node in getManaged(content)) { var position = null; var l = nodelayoutInfo; if (l instanceof FXBorderLayoutInfo) { position = (l as FXBorderLayoutInfo)position; } if (position == null) { position = FXPositionCENTER; } if (positionMapcontainsKey(position)) { throw new IllegalStateException( More than one node with position {position} ); } positionMapput(position, node); if (isHorizontal(position)) { horizontalCount++; } if (isVertical(position)) { verticalCount++; } } vgaps = Mathmax(0, horizontalCount - 1); hgaps = Mathmax(0, verticalCount - 1); mapValid = true; } } // Returns whether a border position is horizontal function isHorizontal(position:FXPosition):Boolean { position == FXPositionNORTH or position == FXPositionCENTER or position == FXPositionSOUTH } // Returns whether a border position is vertical function isVertical(position:FXPosition):Boolean { position == FXPositionEAST or position == FXPositionCENTER or position == FXPositionWEST }
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The map itself, together with a variable that indicates whether it is valid, is declared on lines 2 and 3As you ll see later, we will call the buildPositionMap() function frequently, but on most occasions its content will still be validWe use the mapValid variable to keep track of thisWhen we need to rebuild the map, we just set mapValid to false, and it will be rebuilt next time this function is calledThis happens when something is added to, removed from, or changed in the content sequence, which we detect by adding a trigger:
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override var content on replace { mapValid = false; }
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The variables on lines 4 and 5 keep track of how many horizontal and vertical gaps appear in the layout If the layout contains a north, center, and south node, we need to account for two vertical gaps, whereas if it contains only a center and south node, there is just one If there were only a south node, there would be no gaps at all It is convenient to set the values of these variables as we create the position map The position map is created in the buildPositionMap() functionThe majority of this function, on lines 14 to 35, is a loop that inspects all the managed nodes in the content sequence As you saw in 17, by convention containers only size and position nodes that are managed, leaving application code to handle those that are notThe Container class provides a script function that returns only the managed nodes from a given sequence:
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public function getManaged(content:Node[]):Node[];
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We use this function on line 14 to get the set of nodes that will appear in the position map Once we have a node, we need to get its FXPosition value and make an entry for it in the mapTo get the FXPosition value, we need to get the value of the node s layoutInfo variable and, if this is of type FXBorderLayoutInfo, we can get the FXPosition value from its position variableThe code that does this is shown on lines 16 to 22 If the node does not have a layoutInfo value or it is not of type FXBorderLayoutInfo, we default its position to FXPositionCENTERAs a result, the following is valid and places the Text object in the center position:
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FXBorder { content: [ Text { content: No layoutInfo - CENTER } ] }
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We allow just one node to appear at each position, so before adding the node to the position map, we check that there is not already an entry with the same position as the key (lines 23 to 26) If there is not, we create the map entry (line 27) The code on lines 29 to 34 counts how many nodes that are in horizontal locations and in vertical locationsThe horizontal locations are north, center, and south; and the vertical locations are west, center, and east (Note that center appears in both categories) We maintain these counts so that we can set the number of horizontal and vertical gaps that will appear in the layoutAfter we have processed all the managed nodes, we set the number of horizontal and vertical gaps on lines 36 and 37 Refer to our discussion of gaps earlier in this section if you have any difficulty understanding how these values are set Finally, on line 38, we record that the position map is now valid
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