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The JButton has several constructors to specify text, an icon, or both:
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JButton(String text); JButton(Icon icon); JButton(String text, Icon icon);
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You can also set two other images to go with the button:
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set SelectedIcon(Icon icon); setRolloverIcon(Icon icon);
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//shown when clicked //shown when mouse over
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Finally, like all other JComponents, you can use setToolTipText to set the text of a tooltip which will be displayed when the mouse hovers over the button Here is the code to implement these improvements:
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OK = new JButton("OK", new ImageIcon("colorgif")); OKsetRolloverIcon(new ImageIcon("overColorgif")); OKsetToolTipText("Change background color"); Quit = new JButton("Quit", new ImageIcon("exitgif")); QuitsetToolTipText("Exit from program");
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The resulting application window is shown in Figure 282 with the tooltip up Figure 282 Two picture buttons with the hover tooltip showing
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Program \Swing\Simple\SimpleJFCjava \Swing\Simple\SimpleJFC2java Description Basic two-button program using JxFrame Two-button program with button images and tooltips
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29 Radio Buttons and Toolbars
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Swing provides separate implementations of both the JRadioButton and the JCheckBox A check box has two states, and within a group of check boxes, any number can be selected or deselected Radio buttons should be grouped into aButtonGroup object so that only one radio button of a group can be selected at a time
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Both radio buttons and check boxes can be instantiated with an image as well as a title, and both can have rollover icons The JCheckBox component is derived from the simpler JToggleButton object JToggleButton is a button that can be switched between two states by clicking but which stays in that new state (up or down) like a two-state check box does Further, the JToggle Button can take on the exclusive aspects of a radio button by adding it to a ButtonGroup
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//create radio buttons in the right panel JRadioButton Rep, Dem, Flat; rightadd(Rep = new JRadioButton("Republicrat")); rightadd(Dem = new JRadioButton("Demmican")); rightadd(Flat = new JRadioButton("Flat Earth")); ButtonGroup bgroup = new ButtonGroup(); bgroupadd(Rep); //add to a button group bgroupadd(Dem); bgroupadd(Flat);
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If you neglect to add the radio buttons to a ButtonGroup, you can have several of them turned on at once It is the ButtonGroup that assures that only one button at a time can be turned on The ButtonGroup object enforces this only-one-on protocol by keeping track of the state of all of the radio buttons in the group This is an example of the Mediator pattern discussed in 20
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The JToolBar
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The JToolBar is a container bar for tool buttons of the type you see in many programs Normally, the JDK documentation recommends that you add the JToolBar as the only component on one side of a BorderLayout (typically the North side) and that you not add components to the other three sides The buttons you add to the toolbar are small JButtons with picture icons and without text The JToolBar class has two important methods: add and addSeparator
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JToolBar toolbar = new JToolBar(); JButton Open = new JButton("opengif"); toolbaradd(Open); toolbaraddSeparator();
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By default the JButton has a rectangular shape To make the usual square-looking buttons, you need to use square icons and set the insets of the button to zero On most toolbars, the icons are 25 x 25 pixels Following is a ToolButton class that handles both the insets and the size:
public class ToolButton extends JButton { public ToolButton(Icon img) {
super(img); setMargin(new Insets(0,0,0,0)); setSize(25,25); } }
You also can detach the JToolBar from its anchored position along the top side of the program and attach it to another side, or you can leave it floating This allows some user customization of the running program but otherwise is not terribly useful It also is not particularly well implemented and can be confusing to the user Thus we recommend that you use the setFloatable(false) method to turn this feature off