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The Label Control
The Label class itself adds only one variable of its own, which is described in Table 22-3
Table 22-3 Variable
textFill
Variable of the Label Class Type
Paint
Access
Default
Theme dependent
Description
The Paint to be used to draw the text in the label
You ll see examples that illustrate the effect of each of these variables in the sections that followThe default skin for the Label class does not add any new variables that would allow you to customize it, so the variables in these two tables are the only ones that you need be concerned with when styling a label
Basic Labels
In the simplest case, a label contains a single line of text or some text and a graphicAs you ll see later, you can also use a label to display more than one line text, and you can control where the text appears relative to the graphic, if there is one Some examples of labels are shown in Figure 22-2 Note that the line separators are Line nodes that have been added to show where the boundaries of the labels are they are not provided by the labels themselvesYou can find the code for this example in the file javafxcontrols/Labels1fx in the JavaFX Book More GUI project
Figure 22-2
Labels with text and graphics
The Label at the top is the result of the following code:
Label { text: Address: }
Here, we set only the text variableThe text is drawn using the platform default font (that is, the one given by the script variable FontDEFAULT) and uses the default text fill for the active theme
22 Cross-Platform Controls
textFill
The second example changes the text font and the fill color by setting the font and variables, respectively:
Label { text: Address: textFill: ColorGREEN font: Font { size: 24 } }
A label is not absolutely required to display text you can use it to display just an image, if required, as shown by the third example, which was created by the following code:
Label { graphic: ImageView { image: Image { url: {__DIR__}housesjpg } } }
Here, the graphic variable refers to an ImageView object that loads a small image from the same location as the class file itselfWe could, if required, apply transformations to the image before it is displayed or use an arbitrary node instead of an image The final example has both text and an image:
Label { text: Address: textFill: ColorGREEN font: Font { size: 24 } graphic: ImageView { image: Image { url: {__DIR__}housesjpg } } }
By default, the graphic appears to the left of the text, but this can be changed, as you ll see in the next section
Positioning of Text and Graphics
The Labeled class has four variables that let you control the positioning of the graphic relative to the text, and the overall alignment of the text and graphic relative to the boundaries of the controlThe examples in the following sections show how these variables are used Horizontal Positioning The horizontal position of the graphic is controlled by the graphicHPos variable, which is of type HPosThe effect of assigning various different values to this variable is shown in
The Label Control
Figure 22-3, which is the result of running the code in the file javafxcontrols/Labels2fx
Figure 22-3
Horizontal positioning of the graphic relative to text in a label
In the topmost example, no explicit assignment graphic position has been specified:
Label { text: The Eagle has landed graphic: ImageView { image: smallEagle } }
By default, this variable has the value HPosLEFT, so the graphic appears to the left of the textThe second example sets this variable to HPosRIGHT and, as you can see, the graphic is now to the right of the text:
Label { text: The Eagle has landed graphic: ImageView { image: smallEagle } graphicHPos: HPosRIGHT }
The values HPosLEADING and HPosTRAILING produce results that depend on the reading direction of the user s locale In a locale with left-to-right reading direction (such as the United States and the United Kingdom), the HPosLEADING is the same as HPosLEFT and HPosTRAILING is the same as HPosRIGHTThe third example in Figure 22-3 shows the result of using the value HPosLEADING in a left-to-right locale The value HPosCENTER places the graphic and the text in the same horizontal location that is, the center of the text and the center of the graphic have the same x coordi-