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LAYOUT_DEFAULT LAYOUT_LEFT LAYOUT_RIGHT LAYOUT_CENTER LAYOUT_NEWLINE_BEFORE LAYOUT_NEWLINE_AFTER Table 6-5
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ImageItem Layout Directives
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You can modify the image layout after the image is displayed on the screen by calling the getLayout() method and setLayout() method The getLayout() method returns the current layout directive of an instance of an ImageItem The setLayout() method replaces the current layout with a new layout whose directive is passed as a parameter to the setLayout() method Likewise, you can modify the label and alternate text associated with an image by calling the getLabel() method, setLabel method, getAltText() method, and setAltText() method The getLabel() and getAltText() methods retrieve the current label and alternate text, and the setLabel() and setAltText() methods are called to replace them Both the setLabel() and setAltText() methods require one parameter, which is the replacement text The image itself is replaceable by calling the getImage() method and the setImage() method The getImage() method fetches the current image associated with the instance of the ImageItem, and the setImage() method associates a new image with the instance The setImage() method requires you to pass it an instance of an Image class Therefore, you ll need to create a new instance of the Image class for the new image before calling the setImage() method
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Listing 6-21 contains the JAD file for Listing 6-22, which illustrates how to create instances of an Image class and an ImageItem class and then display an immutable image on the screen The necessary variables are declared at the beginning of the program and are assigned relative objects within the ImmutableImage constructor The ImmutableImage constructor is slightly different from constructors of other examples in this chapter because it includes a try { } block The try { } block contains statements that create an instance of the Image class and an instance of the ImageItem class and then associates the image item with the form These statements are placed within the try { } block to detect an exception that is thrown if the file name passed to the createImage() method isn t found
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Creating an Instance of an ImageItem Class
Listed here are the steps required to create an instance of an ImageItem class: 1 Declare references
2 Obtain a reference to the instance of the Display class 3 Create an instance of a Command class to exit the MIDlet 4 Create an instance of the Form class 5 Associate the instance of the Command class to the instance of the Form class 6 Associate a CommandListener with the instance of the Form class 7 Create an instance of the Image class 8 Create an instance of the ImageItem class 9 Place the image on its own line to the left of the screen and display My Image whenever the image cannot be displayed 10 Associate the instance of the ImageItem class to the form 11 Display an alert dialog box if the image cannot be found 12 Display the instance of the Form class on the screen 13 Evaluate the command selected by the user 14 If the Exit command is selected, terminate the MIDlet
The first statement within the try { } block calls the createImage() method and passes the name of the file that contains the image we want displayed on the screen Obviously, you should replace the image myimagepng with the file name of your own image The next statement creates an instance of an ImageItem class Notice that a null is passed as the first parameter to the constructor of the ImageItem class because there is no label for the image The next parameter is reference to the image created by calling the createImage() method in the previous statement The third parameter contains three layout directives The first directive states that the image must appear below the previous image or text on the screen The second layout directive requests that the image appear left on the screen And the last layout directive states that no other images or text should appear on the same line on the screen as the image The image item is then appended to the form An exception is thrown if for some reason myimagepng cannot be loaded into the instance of the Image class The catch { } block traps the exception and displays an alert message that a problem exists with the myimagepng file Barring an exception being thrown, the form and image are displayed on the screen when the startApp() method is called to invoke the setCurrent() method The rest of Listing 6-22 is nearly identical to previous listings shown in this chapter
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