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112 Wizards
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1122 IWizardPage
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Wizards use the orgeclipsejfacewizardIWizardPage interface to communicate with the pages they contain Typically, you will subclass the orgeclipsejfacewizardWizardPage class, accessing and overriding the following methods, rather than implementing the IWizardPage interface The wizard page s task is to present a page of information to the user, validate any information entered by the user on that page, and provide accessors for the wizard to gather the information entered createControl(Composite) Creates the controls comprising this wizard page
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dispose() Cleans up any native resources, such as images, clipboard, and so on, that were created by this class This follows the if you create it, you destroy it theme that runs throughout Eclipse getContainer() Returns the wizard container for this wizard page getDialogSettings() Returns the dialog settings for this wizard
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getWizard() Returns the wizard that hosts this wizard page setDescription(String) Sets the descriptive text appearing in the
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setErrorMessage(String) Sets or clears the error message for this
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setImageDescriptor(ImageDescriptor) Sets the image that
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appears in the wizard s title area
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setMessage(String) Sets or clears the message for this page setPageComplete(boolean) Sets whether this page is complete This forms the basis for determining whether the Next and Finish buttons are enabled setTitle(String) Sets the title that appears in the title area of the
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setVisible(boolean) Sets the visibility of this dialog page Subclasses can extend this method (being sure to call the superclass method) to detect when a page becomes the active page
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One approach for validating information entered by a user on a wizard page is for each field to have a listener that calls an updatePageComplete() method in the wizard page (snipped from Section 1128, Page content based on selection, on page 475)
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Dialogs and Wizards
sourceFileField = new Text(container, SWTBORDER); sourceFileFieldaddModifyListener(new ModifyListener() public void modifyText(ModifyEvent e) { updatePageComplete(); } });
This updatePageComplete() method would be responsible for checking the content in each field, displaying an error message as appropriate, and calling the setPageComplete() method (see Section 1128, Page content based on selection, on page 475 for an example) The pageComplete attribute is used by the wizard container to determine whether the Next and Finish buttons should be enabled
New since Eclipse 32 The
orgeclipsejfacefieldassist
package adds images, hover text, content proposals, and auto type-ahead to fields in forms, dialogs, and wizards This functionality can help a user understand and enter information into a form-based user interface
1123 IWizardContainer
The wizard uses the orgeclipsejfacewizardIWizardContainer interface to communicate with the context in which it is being displayed
getCurrentPage() Returns the current page being displayed getShell() Returns the shell for this wizard container run(boolean, boolean, IRunnableWithProgress) Runs the given runnable in the context of the wizard dialog The first argument fork indicates whether the runnable should be executed in a separate thread The second argument cancelable indicates whether the user should be allowed to cancel the operation while it is in progress (see Section 4251, Display, on page 148 for more on the UI thread) showPage(IWizardPage) Shows the specified wizard page This should not be used for normal next/back page flow, but exists for custom page flow such as double-clicking in a list updateButtons() Adjusts the enable state of the Back, Next, and Fin-
ish buttons to reflect the state of the active page in this container
updateMessage() Updates the message shown in the message line to reflect the state of the currently active page in this container updateTitleBar() Updates the title bar (title, description, and image)
to reflect the state of the active page in this container
updateWindowTitle() Updates the window title to reflect the state of
the wizard
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112 Wizards
In addition to IWizardContainer, WizardDialog implements both IWizardContainer2 and IPageChangeProvider In your wizard, you can obtain the container using getContainer() and then test to see whether it implements either of these interfaces to access additional functionality
addPageChangedListener(IPageChangedListener) Adds a lis-
tener for page changes in this page change provider
getSelectedPage() Returns the currently selected page in the dialog removePageChangedListener(IPageChangedListener) Removes the given page change listener from this page change provider updateSize() Updates the window size to reflect the state of the cur-
rent wizard
1124 Nested wizards
One wizard can contain one or more nested wizards such as the Import and Export wizards The orgeclipsejfacewizardWizardSelectionPage class provides behavior for managing one or more nested wizards When a nested wizard can be determined, a WizardSelectionPage subclass calls the setSelectedNode() method When a user clicks the Next button, the WizardSelectionPage class uses that information via the orgeclipse jfacewizardIWizardNode interface to create and manage the nested wizard