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The armed variable is not the same as the pressed variable that is inherited from the Node class The armed variable is set to false if the user moves the mouse outside of the button even if the primary mouse button is still pressed, but the pressed variable is reset to false only when the mouse button is released In addition, the armed variable can be manipulated programmatically and be set and cleared as a result of key presses, unlike pressed, which is controlled entirely by the state of the mouse
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A button s action function is called when the button is fired, which occurs under any of the following circumstances, assuming that the button is enabled:
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The fire() function inherited from ButtonBase is called The button is armed and the primary mouse button is released The button is armed and the Spacebar is released
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The color of the button is changed to reflect the following states:
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Whether the mouse has the input focus (which is actually represented by a colored border around the outside of the control) Whether the button is disabled Whether the mouse is over the button Whether the button is armed
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Color changes are animated so that they appear to take place gradually over a short space of timeThe Button class does not have any variables that let you change the colors that it uses to represent its various states or the color of its textTo do this, you need to use a style sheetYou ll see how to do this in the next chapter
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The Hyperlink Class
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The Hyperlink control is simply a button that is styled to look like a hyperlink in a web page Like a button, its function is to allow the user to initiate an action, which is triggered by clicking the control with the mouse or pressing and releasing the Spacebar while it has the focusThe name of this control suggests that activating it should cause a web page to be opened, but the control itself does not provide this functionality it simply invokes its action function, which could choose to open a web page or do something completely different Like button, the Hyperlink class is derived from both ButtonBase and Labeled, although at the time of this writing, most of the variables inherited from the Labeled mixin are not actually used by the default skin, so have no effect on the appearance of the hyperlinkTable 22-6 lists the variables that the Hyperlink class itself defines, in addition to those inherited from ButtonBase
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Table 22-6 Variable
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armed visited
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Variables of the Hyperlink Class Type
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Boolean Boolean
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Access
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false false
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Description
Whether the button is armed Indicates whether this link has already been activated Function to be called when the hyperlink is clicked while armed
action
function( ):Void
null
Button Controls
The action variable is the same as those of that of the Button classThe visited variable is set to true once the hyperlink has been clicked, which causes the text to be drawn in a different color Using the Hyperlink Control The source file javafxcontrols/Buttons2fx contains a simple application that allows you to select and view one of a small number of thumbnail imagesWe ll use this example to illustrate the Hyperlink control, along with some of the other button types that you ll see later in this chapterThe thumbnails are displayed by a custom node that incorporates a Hyperlink which, when clicked, opens a full-size version of the thumbnail in a separate window Figure 22-10 shows the location of this hyperlink
Hyperlink control
Figure 22-10
An application containing a Hyperlink control
If you select one of the thumbnails and then move the cursor over the hyperlink, it is armed and, as a result, two things happen:
The cursor changes to a hand2 The hyperlink text is underlined, as shown in Figure 22-11
The cursor actually changes to the one installed in the cursor variable of the Hyperlink node or to the hand cursor if you don t set a more specific one