Three toggle buttons in two groups in Java

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Three toggle buttons in two groups
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24 Using Swing Controls
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The first two buttons represent mutually exclusive choices display prices in pounds or dollars so they shouldn t both be selected at the same timeTo enforce this restriction, these buttons are placed in a toggle group, as shown on lines 18 and 27 of Listing 24-3 Initially, the Price in USD button is pressed, because its selected variable is initialized to true on line 17 If you click the Price in GBP button, the Price in USD button will be deselected automaticallyThe action function of a SwingToggleButton is called when it is pressed that is, when its selected variable changes valueThe code in this function will need to test the state of the button s selected variable to decide whether to take any actionTypically, it would take action only when the button is pressed in that is, when the selected variable has the value true The Send Email button is not in a toggle group Pressing it just changes the value of its selected variable and invokes its action function
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Radio Buttons and Check Boxes
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Radio buttons and check boxes are simply different visual representations of toggle buttonsYou typically use a set of radio buttons rather than a set of toggle buttons in a toggle group and a check box instead of a toggle button that is not in a toggle group Radio buttons therefore represent a set of mutually exclusive choices, whereas check boxes are used to select or deselect features that are independent of each other Radio buttons are represented by the SwingRadioButton class and check boxes by the SwingCheckBox class Both of these classes derive from SwingToggleButton, and neither of them adds any new variables or functions only the visual representation differsThe following code extract shows how you would replace the first two toggle buttons in Listing 24-3 with radio buttons:
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SwingRadioButton { text: "Price in USD" selected: true toggleGroup: toggleGroup action: function():Void { println("Price in USD changed state"); } translateX: 70 translateY: 15 } SwingRadioButton { text: "Price in GBP" selected: false toggleGroup: toggleGroup action: function():Void { println("Price in GBP changed state"); } translateX: 70 translateY: 60 }
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The only difference in the code is the change of classname in the object initializers The result is a change in the visual appearance, as shown in Figure 24-11
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Figure 24-11
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Comparing radio buttons and check boxes
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Similarly, replacing the third toggle button in Listing 24-3 with a check box requires only a change of classname, with the result shown at the bottom of Figure 24-11:
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SwingCheckBox { text: "Send Email" selected: false action: function():Void { println("Send Email changed state"); } translateX: 70 translateY: 105 }
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The default representation of a radio button is a circle, and a check box is represented by a squareWhen selected, the radio button has a dot in the center of the circle, and the check box has a tick If you want, you can change this representation by setting the icon variable of the SwingRadioButton or SwingCheckBox object If you do this, you should also create an icon that provides a different representation when the button is selected and install it in the pressedIcon variable
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The SwingList Class
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The SwingList component displays a list of items and allows the user to select one or more of themThe items in the list are wrapped in instances of the SwingListItem class The variables of the SwingList class are shown in Table 24-6 and those of the SwingListItem class in Table 24-7
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24 Using Swing Controls
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Table 24-6 Variable
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items selectedIndex selectedItem
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Variables of the SwingList Class Type
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SwingListItem[] Integer SwingListItem Boolean
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Access
RW RW RW RW
Default
empty
-1 null true
Description
The items to be displayed in the list The index of the first selected item in the list The first selected item in the list Whether scrollbars should be shown if the list of items is too large to be seen all at once