Cross-Platform Controls in Java

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22 Cross-Platform Controls
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Figure 22-11
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An armed Hyperlink control
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You can see both of these effects in Figure 22-11 The source code for the custom node that contains the image thumbnail and the hyperlink, which you can find in the file javafxcontrols/Thumbnailfx, is shown in Listing 22-1
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Listing 22-1
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A Custom Control That Displays a Thumbnail Image and a Hyperlink
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public class Thumbnail extends CustomNode { public var thumbURL:String; public var thumbWidth:Number; public var thumbHeight:Number; public var action: function():Void; public var smooth:Boolean; public var placeholder:Image; protected override var children = { 10 var link:Hyperlink; content: [ ImageView { fitWidth: bind thumbWidth fitHeight: bind thumbHeight preserveRatio: true smooth: bind smooth image: bind Image { url: thumbURL backgroundLoading: true placeholder: placeholder } } [
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Button Controls
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link = Hyperlink { layoutX: bind (thumbWidth - linklayoutBoundswidth) / 2 layoutY: bind thumbHeight + 2 text: View at full size hpos: HPosCENTER disable: bind thumbURL == action: bind action } ] } } }
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The variables that the custom node provides to allow the thumbnail to be configured are declared on lines 2 to 7 of Listing 22-1, and the hyperlink itself is created on lines 24 to 31As you can see, its text variable is initialized (on line 28) with a fixed string, while its action variable is set from the value of the action variable of the custom node itself Here s how this custom control is used in the example shown in Figure 22-11
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 thumbnail = Thumbnail { thumbURL: bind images[selectedImage] thumbWidth: 300 thumbHeight: 300 smooth: bind smooth placeholder: placeholder action: function():Void { Stage { title: {thumbnailthumbURL} resizable: false scene: Scene { content: ImageView { image: Image { url: thumbnailthumbURL } } } } } }
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The action function that is declared on lines 7 to 19 is the one that is actually called from the hyperlink s action function when it is clicked It opens a new stage to display the full-sized image corresponding to the thumbnail in the custom node
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22 Cross-Platform Controls
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The ToggleButton, RadioButton, and CheckBox Classes
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The ToggleButton, RadioButton, and CheckBox classes provide different ways to allow the user to make an on/off or true/false selectionToggle buttons are often used in toolbars because they can be made to be very compact if used with an icon but no text, whereas radio buttons and check boxes are usually preferred when building formsAll three of these classes incorporate the Labeled mixin, so you can use the variables of that class to change the text font, add an icon (although that would probably not be very useful in the case of a radio button or check box), and so on Toggle Buttons and Radio Buttons ToggleButton and RadioButton (which derives from ToggleButton) have the same API Both derive from ButtonBase and also include the Toggle mixin, which provides the variables listed in Table 22-7
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Table 22-7 Variable
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selected
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Variables of the ToggleButton and RadioButton Classes Type
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Boolean
Access
Default
false
Description
true if the button is in
the selected state
toggleGroup ToggleGroup
null
The ToggleGroup of which the button is a member, or null if it is not in a ToggleGroup An arbitrary value that can be used to distinguish this control from others in the same ToggleGroup
value
Object
null
The code in Listing 22-2, from the file javafxcontrols/ToggleButtons1fx, creates two toggle buttons and reports when their states changeThe result of running this code is shown in Figure 22-12
Figure 22-12
Two toggle buttons in a ToggleGroup
Button Controls
Listing 22-2
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