Dialogs in Java

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Dialogs
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- (windowLocy - screenAreay); getShell()setSize(newWindowSize); ((Composite) getContents())layout(); } protected abstract Control createDetailsArea( Composite parent); }
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Opening a dialog finding a parent shell
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When constructing a new dialog, you need to know the parent shell You can specify null for the parent shell, but this will prevent proper association of the dialog with its parent; if the dialog is modal as many dialogs are, then specifying the correct parent shell will prevent the user from being able to activate the parent window before closing the dialog So the question becomes how to obtain the parent shell IWorkbenchWindowActionDelegate (see example code in Section 626) If you have an action delegate, then Eclipse provides the workbench window from which a shell can be obtained Immediately after the action delegate is instantiated, Eclipse calls the init( ) method with the work-
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TT 11 Dialogs and Wizards
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bench window as the argument Cache this window and pass the window s shell as an argument when constructing your dialog:
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private IWorkbenchWindow window; public void init(IWorkbenchWindow window) { thiswindow = window; } public void run(IAction action) { Shell parentShell = windowgetShell(); MyDialog dialog = new MyDialog(parentShell, ); etc }
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IObjectActionDelegate (see Section 633) If you have a action in a context menu, the Eclipse provides the target part from which a shell can be obtained Before the run( ) method is called, Eclipse calls setActivePart( ) with the target part Cache this part and pass the shell containing the part as an argument when constructing your dialog:
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private IWorkbenchPart targetPart; public void setActivePart(IAction action, IWorkbenchPart targetPart) { thistargetPart = targetPart; } public void run(IAction action) { Shell parentShell = targetPartgetSite()getShell(); MyDialog dialog = new MyDialog(parentShell, ); etc }
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Dialogs
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IViewPart or IEditorPart (see Section 72 or 82) If you have a view or editor, then you can obtain the workbench window containing that part, and from that obtain the shell:
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Shell parentShell = viewOrEditorgetSite()getShell();
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PlatformUI The platform user interface provides the workbench window from which a shell can be obtained:
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Shell parentShell = PlatformUIgetWorkbench() getActiveWorkbenchWindow()getShell();
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Display (see Section 4251) If all else fails, you can obtain the shell of the active window from the Display:
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Shell parentShell = DisplaygetDefault()getActiveShell();
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TT 11 Dialogs and Wizards
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112 WIZARDS
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Figure 11-6 Wizard class hierarchy
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orgeclipsejfacewizardWizardDialog
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is a specialized subclass of Dialog
(see Figure 11-6) used when a modal operation requires a particular sequence for its information collection or when there are too many fields for a single screen Wizards have a title area along the top, a content area in the
Wizards
middle showing the wizard pages, a progress bar as needed, and Help, Next, Back, Finish, and Cancel buttons (or some subset) along the bottom (see Figure 11-7) The title area contains the wizard's title, description, an optional image, and an error, warning, or informational message as required
Figure 11-7 Default wizard dialog structure
TT 11 Dialogs and Wizards
1121 IWizard Rather than subclass WizardDialog, you should subclass
orgeclipsejfacewizardWizard orgeclipsejfacewizardIWizard
which implements the interface for use with the WizardDialog
The WizardDialog uses the IWizard interface to obtain the pages to be displayed and notify the wizard of user interaction The concrete wizard class provides much of the IWizard behavior for you, allowing you to focus on a subset of the IWizard interface The wizard s task is to create and initialize the pages it contains, handle any special customized flow and information between pages, and execute the operation when the Finish button is pressed
addPages()
- Subclasses should override this method to add the
appropriate pages by calling addPage( )
dispose()
- Cleanup any native resources, such as images,
clipboard, etc, that were created by this class This follows the if you create it you destroy it theme that runs throughout Eclipse
Wizards
getContainer()
- Returns the wizard container in which this
wizard is being displayed
getDialogSettings()
- Returns the dialog settings for this wiz-
ard page
getNextPage(IWizardPage)
- Returns the wizard page to be
shown after the specified wizard page or null if none The default implementation shows pages in the order in which the pages were added to the wizard, so subclasses need only override this method to implement a custom page flow
getPreviousPage(IWizardPage)