Editor lifecycle in Java

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Modifications made in an editor must follow an open-save-close lifecycle model When an editor first opens, the editor s contents should be unmodified (clean) If the contents are modified, the editor should communicate this change to the platform In response, an asterisk should appear in the editor s tab The modifications should be buffered within the edit model until such time as the user explicitly saves them At that point, the modifications should be committed to the model storage
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To pass this test, open your editor on a file and show that the editor is initially unmodified Then make a change using the editor and show that an asterisk appears in the editor s tab Finally, save the editor and show that the changes have been committed to the file and that the editor has gone back to its unmodified state See Section 84, Editor Lifecycle, on page 378 for more information about editor lifecycles
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If an editor has support for cut, copy, paste, or any of the global actions, the same actions must be executable from the same actions in the window menu and toolbar The window menu contains a number of global actions, such as cut, copy, and paste in the Edit menu These actions target the active part, as indicated by a shaded title area If these actions are supported within an editor, the editor should hook into these window actions so that selection in the window menu or toolbar produces the same result as selection of the same action in the editor The editor should not ignore these actions and contribute duplicate actions to the window menu or toolbar The following are the supported global actions: a Undo b Redo c Cut d Copy e Paste f Print g Delete h Find i Select all j Bookmark Show that your editor supports any relevant global actions such as cut, copy, and paste Trigger those actions from within your editor and then show that they may also be triggered from the workbench s menu bar with the same effect For the Properties editor, you would show that global actions, such as delete, can be accessed within both the Properties and Source pages of the editor See Section 8521, Global actions, on page 385 for more about hooking up global actions
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If the input to an editor is deleted and the editor contains no changes, the editor should be closed When a resource is deleted from one of the navigators (eg, Navigator view, J2EE view, Data view, or DBA Explorer view in SDP), the handling of any editor that is currently open on that resource depends on whether the editor has any unsaved changes If the editor does not contain any changes since the resource was last saved then the editor should be immediately closed Show that your editor is closed automatically any time an input object to your editor (eg, a specific resource) is deleted For the Properties editor, you would create a new properties file, open it with the Properties editor, and then delete the file in the Navigator view If you implement your editor using the editor framework described in this chapter, the framework should automatically enforce this guideline
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If modifications to a resource are made outside the workbench, users should be prompted to either override the changes made outside the workbench or back out of the Save operation when the save action is invoked in the editor Open your editor on a file and make a change Next, modify the file outside Eclipse Finally, switch back to Eclipse and attempt to save the file Show that you are prompted to override the external changes or to cancel the save operation If you implement your editor using the editor framework described in this chapter, the framework should automatically enforce this guideline