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23 Style Sheets
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is PaintAs you ll see later, there are various different ways to define a Paint, which allow you to specify a solid color or a gradient Note
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Style sheet filenames conventionally use the suffix css If you use the javafxpackager command to package your application, any files with this suffix are parsed as style sheets and converted to binary form in a file of the same name but with the suffix bss The binary style sheets can be loaded faster, so whenever your JavaFX application references a style sheet, the runtime will first look for a binary version by replacing the css suffix with bss and will read the original file only if the binary file is not present This process happens automatically if you use NetBeans or Eclipse because the plug-ins for both of these integrated development environments (IDEs) use javafxpackager behind the scenes
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The control classes that we discussed in the preceding chapter automatically register themselves so that they can be styled by using a class name based on the control class name For example, you can style all TextBox controls by using the style name textbox, without setting the styleClass variable of the control
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Selection by ID
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You use selection by class when you want to apply the same styles to a number of different nodesAn alternative to this, which is typically used to target individual nodes, is selection by IDTo apply a style sheet rule to a node with a given ID (or to multiple nodes if they all have the same ID, which would be unusual), use the ID as the rule selector, preceded by a #The following style sheet contains the style class rule from the previous section plus a rule that selects any node whose ID is third:
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my-style { -fx-fill: red; -fx-font-size: 32; } #third { -fx-font-size: 48; -fx-font-style: italic; }
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To see the effect of this style sheet, we add a third text node to the code shown in Listing 23-1:
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Text { content: Third Text id: third }
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If you run this example, which is in the file javafxstyle/Styles2fx, you ll get the result shown in Figure 23-2
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Figure 23-2
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Using selection by ID to style a node
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As you can see, the new style, which specifies a 48-point italic font, has been applied to the new text node, because the value of its id variable matches the ID selector in the style sheet Selection by Class and ID If you include both a style class and an ID in your selector, the rule applies only to nodes that have both the specified style class and ID Here s a style sheet that has such a rule:
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my-style { -fx-fill: red; -fx-font-size: 32; } #third { -fx-font-size: 48; -fx-font-style: italic; } #thirdanother-style { -fx-fill: lightGray; }
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The code in the file javafxstyle/Styles3fx adds a fourth node to the previous example:
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Text { content: Fourth Text id: third styleClass: another-style }
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Figure 23-3 shows the result of applying the new style sheet to this node
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Figure 23-3
Selection by class and ID
Because the new node has both the correct style class (another-style) and the correct ID (third), the rule applies to it and, therefore, its text is drawn in light gray It is important to note that the rule for ID third has been applied, as well, because this node also has the ID value needed to trigger that rule, with the result that the text is also in a 48-point italic font State-Dependent Styling It often proves useful to change the appearance of a node based on some aspect of its state Nodes in JavaFX can be styled differently based on any or all of the following states:
n n n n
hover:When
the mouse is over the node the mouse is over the node and a button is pressed focused:When the node has the keyboard focus disabled:When the node is disabled