Labels in Java

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Label #1 shows text rendered with the default font and foreground color In the case of Label #2, the foreground color has been changed to red by setting the foreground variable, while Label #3 has a larger font installed in the font variable The documentation for the text property says that SwingLabel will display only a single line of textThis is not quite correct It is certainly true that newlines in the value of the text variable will be ignored, so this does not work the text, without the newline character, will appear on a single line:
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SwingLabel { text: "Line1\nLine 2" // Does not work }
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If you need a multiline label, all you have to do is to wrap the text in HTML and use the <br> tag to force a line break, like this:
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SwingLabel { text: "<html><I>Label<br>Number 4</I></html>" font: Font { size: 16 } }
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This is how Label #4 in Figure 24-3 was createdAs you can see, this code forces the use of an italic font by using the HTML <I> element SwingLabel inherits its support of HTML from the Swing JLabel component, which understands a reasonable subset of the HTML 40 standard The bottom label in Figure 24-3 has both the icon and text variables set:
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SwingLabel { text: "Label with icon" icon: icon }
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The value used to initialize the icon variable is of type SwingIcon, which is a JavaFX implementation of the javaxswingIcon interface In Swing, you can create a class that implements this interface by drawing arbitrary content, which can then be made to appear in labels and buttons, among other places More commonly, you would use the standard implementation in the javaxswingImageIcon class, which loads and draws an image onto the hosting componentThe SwingIcon class is not a general implementation of the Icon interface it is limited to drawing an image, supplied in the form of a javafxsceneimageImage object Here is how the icon object used by this label is created:
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def img = Image { url: "{__DIR__}FXLogogif" } def icon = SwingIcon { image: img };
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The first line creates an Image object that loads the content of the specified file, which happens to contain a small JavaFX logoThe second line creates a SwingIcon that wraps that image so that wherever this object is used, the JavaFX logo will be drawn
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24 Using Swing Controls
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Positioning the Content of SwingLabel
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When a label is made wider or taller than it needs to be to accommodate the text/icon that it contains, you can specify where the extra space appears relative to the contentThe horizontal positioning of the text and icon is controlled by the horizontalAlignment variable and the vertical positioning by the verticalAlignment variable Horizontal Alignment The horizontalAlignment variable is of type SwingHorizontalAlignmentThis class defines constants that correspond to five possible ways to position the label s content, not all of which are differentThe constant values are as follows:
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SwingHorizontalAlignmentLEFT SwingHorizontalAlignmentRIGHT SwingHorizontalAlignmentCENTER SwingHorizontalAlignmentLEADING SwingHorizontalAlignmentTRAILING
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Figure 24-4 illustrates four of the five possible horizontal alignment values
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Figure 24-4
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SwingLabels with different horizontal alignment values
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The four labels in this example have been made deliberately wider than they need to be so that you can see the effects of the different horizontalAlignment values In addition, lines have been drawn between the labels so that you can see the space occupied by each of them The topmost label has its horizontalAlignment variable set to its default value, which is SwingHorizontalAlignmentLEADING1:
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SwingLabel { text: "Default" icon: icon }
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The code extracts in this section show only the parts of the code that are relevant to the discussion The full source code, which you ll find in the file javafxswing/SwingLabels2fx, also sets the variables that determine the size and positioning of the labels