barcode vb.net After this statement executes, the button can be pressed by typing ALT-T in Java

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After this statement executes, the button can be pressed by typing ALT-T
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NOTE There is another version of setMnemonic( ) that takes a char argument, but it is considered
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obsolete You can use a string containing HTML as the text to be displayed inside a button To do so, begin the string with <html> When this is done, the text is automatically formatted as specified by the markup This lets you create buttons that have titles that span two or
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more lines But be careful this can lead to overly large buttons, which sometimes have a disagreeable effect One other point: when using HTML, the mnemonic associated with a button will not be displayed
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The following example expands the example from the previous recipe by adding icons and mnemonics, and by setting jbtnA as the default button When you try the program, you will notice that the rollover icon is displayed when the mouse passes over a button The pressed icon will be displayed when the button is pressed Each time you press jbtnA, jbtnB toggles between enabled and disabled When the button is disabled, the disabled icon is displayed When either button is pressed, the pressed icon is displayed Notice that the mnemonics for jbtnA and jbtnB are A and B, respectively Also notice that jbtnA is set as the default button This means that it is pressed when you press ENTER
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// Demonstrate button icons, a default button, HTML in a button, // and button mnemonics import javaawt*; import javaawtevent*; import javaxswing*; class CustomizeButtons { JLabel jlab; JButton jbtnA; JButton jbtnB; CustomizeButtons() { // Create a new JFrame container JFrame jfrm = new JFrame("Customize Buttons"); // Set the layout manager to FlowLayout jfrmsetLayout(new FlowLayout()); // Give the frame an initial size jfrmsetSize(220, 90); // Terminate the program when the user closes the application jfrmsetDefaultCloseOperation(JFrameEXIT_ON_CLOSE); // Create a label jlab = new JLabel("Press a button"); // Load the icons ImageIcon iconA = new ImageIcon("IconAgif"); ImageIcon iconADis = new ImageIcon("IconADisgif"); ImageIcon iconARO = new ImageIcon("IconAROgif"); ImageIcon iconAP = new ImageIcon("IconAPressedgif");
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ImageIcon ImageIcon ImageIcon ImageIcon
iconB = new ImageIcon("IconBgif"); iconBDis = new ImageIcon("IconBDisgif"); iconBRO = new ImageIcon("IconBROgif"); iconBP = new ImageIcon("IconBPressedgif");
// Specify the default icon when constructing the buttons jbtnA = new JButton("Alpha", iconA); jbtnB = new JButton("Beta", iconB); // Set rollover icons jbtnAsetRolloverIcon(iconARO); jbtnBsetRolloverIcon(iconBRO); // Set pressed icons jbtnAsetPressedIcon(iconAP); jbtnBsetPressedIcon(iconBP); // Set disabled icons jbtnAsetDisabledIcon(iconADis); jbtnBsetDisabledIcon(iconBDis); // Set jbtnA as the default button jfrmgetRootPane()setDefaultButton(jbtnA); // Set mnemonics for the buttons jbtnAsetMnemonic(KeyEventVK_A); jbtnBsetMnemonic(KeyEventVK_B); // Handle button events jbtnAaddActionListener(new ActionListener() { public void actionPerformed(ActionEvent ae) { if(jbtnBisEnabled()) { jlabsetText("Alpha pressed Beta is disabled"); jbtnBsetEnabled(false); } else { jlabsetText("Alpha pressed Beta is enabled"); jbtnBsetEnabled(true); } } }); jbtnBaddActionListener(new ActionListener() { public void actionPerformed(ActionEvent ae) { jlabsetText("Beta pressed"); } }); // Add the buttons and label to the content pane jfrmadd(jbtnA); jfrmadd(jbtnB); jfrmadd(jlab);
8:
Swing
// Display the frame jfrmsetVisible(true); } public static void main(String args[]) { // Create the frame on the event dispatching thread SwingUtilitiesinvokeLater(new Runnable() { public void run() { new CustomizeButtons(); } }); } }
Sample output is shown here, but to truly appreciate the effect of the icons, mnemonics, and the default button, you will need to run the program yourself
Options and Alternatives
To see the effect of using HTML inside a button, change the declarations for jbtnA and jbtnB, as shown here:
jbtnA = new JButton("<html>Alpha<br>Press Me", iconA); jbtnB = new JButton("<html>Beta<br>Press Me, Too!", iconB);
The buttons will now look as shown here:
Notice that the mnemonics are no longer displayed They will, however, still work You can determine if a button is the default button by calling isDefaultButton( ), shown here: boolean isDefaultButton( ) You can indicate that a button should not be used as the default button by calling setDefaultCapable( ), shown here: void setDefaultCapable(boolean on)
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If on is true, the button can be used as a default button If on is false, it should not be used as a default button You determine if a button is default-capable by calling isDefaultCapable( ), shown next: boolean isDefaultCapable( ) It returns true if the button should be used as a default button and false otherwise As a general rule, buttons are default-capable by default, but this property can be set to false if the look and feel does not support default buttons You should be careful when specifying a default button because it is easy for the user to press it unintentionally The rule that I follow is simple: a default button should do no harm If the default button will change a file, for example, then you need to have a safety check that prevents the user from accidentally overwriting the preexisting file The addition of the default, rollover, disabled, and pressed icons adds visual appeal to your interface However, adding these icons will also increase download time Therefore, you must balance their benefits against their cost
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