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74 Linking the View
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744 Opening an editor
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When a user double-clicks on a file in the Favorites view, a file editor should open To accomplish this, add a new FavoritesView method that is called from the createPartControl() method
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private void hookMouse() { viewergetTable()addMouseListener(new MouseAdapter() { public void mouseDoubleClick(MouseEvent e) { EditorUtilopenEditor(getSite()getPage(), viewergetSelection()); } }); }
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This method references a new static method in a new EditorUtil class The new static method examines the first element in the current selection, and if that element is an instance of IFile, opens an editor on that file
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public static void openEditor( IWorkbenchPage page, ISelection selection) { // Get the first element if (!(selection instanceof IStructuredSelection)) return; Iterator< > iter = ((IStructuredSelection) selection)iterator(); if (!iterhasNext()) return; Object elem = iternext(); // Adapt the first element to a file if (!(elem instanceof IAdaptable)) return; IFile file = (IFile) ((IAdaptable) elem)getAdapter(IFileclass); if (file == null) return; // Open an editor on that file try { IDEopenEditor(page, file); } catch (PartInitException e) { FavoritesLoglogError( "Open editor failed: " + filetoString(), e); } }
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CHAPTER 7
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Saving View State
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Up to this point, the Favorites view contains only the current list of projects when the Eclipse session starts up Items can be added to the Favorites view during the course of the session, but as soon as Eclipse is shut down, the changes are lost In addition, the view s sort and filter information should be saved so that the view will be returned to the same state when the session is restarted To accomplish all this, two different mechanisms are used
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751 Saving local view information
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Eclipse provides a memento-based mechanism for saving view and editor state information In this case, this mechanism is good for saving the sorting and filter state of a view because that information is specific to each individual view It is not good for saving global information shared by multiple views, so that is tackled in the next section To save the sorting state, two methods should be added to the FavoritesViewSorter The first method saves the current sort state as an instance of IMemento by converting the sort order and ascending/descending state into an XML-like structure The second method takes a very guarded approach to reading and resetting the sort order and ascending/descending state from IMemento so that the sort state will be valid even if IMemento is not what was expected
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private private private private static static static static final final final final String String String String TAG_DESCENDING = "descending"; TAG_COLUMN_INDEX = "columnIndex"; TAG_TYPE = "SortInfo"; TAG_TRUE = "true";
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public void saveState(IMemento memento) { for (int i = 0; i < infoslength; i++) { SortInfo info = infos[i]; IMemento mem = mementocreateChild(TAG_TYPE); memputInteger(TAG_COLUMN_INDEX, infocolumnIndex); if (infodescending) memputString(TAG_DESCENDING, TAG_TRUE); } } public void init(IMemento memento) { List<SortInfo> newInfos = new ArrayList<SortInfo>(infoslength); IMemento[] mems = mementogetChildren(TAG_TYPE); for (int i = 0; i < memslength; i++) { IMemento mem = mems[i]; Integer value = memgetInteger(TAG_COLUMN_INDEX);
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75 Saving View State
if (value == null) continue; int index = valueintValue(); if (index < 0 || index >= infoslength) continue; SortInfo info = infos[index]; if (newInfoscontains(info)) continue; infodescending = TAG_TRUEequals(memgetString(TAG_DESCENDING)); newInfosadd(info); } for (int i = 0; i < infoslength; i++) if (!newInfoscontains(infos[i])) newInfosadd(infos[i]); infos = newInfostoArray(new SortInfo[newInfossize()]); }
In addition to saving the sort state, the filter state needs to be saved This is accomplished by adding the following two methods to the FavoritesViewFilterAction type
public void saveState(IMemento memento) { nameFiltersaveState(memento); } public void init(IMemento memento) { nameFilterinit(memento); }
Then add two new methods to FavoritesViewNameFilter:
private static final String TAG_PATTERN = "pattern"; private static final String TAG_TYPE = "NameFilterInfo"; public void saveState(IMemento memento) { if (patternlength() == 0) return; IMemento mem = mementocreateChild(TAG_TYPE); memputString(TAG_PATTERN, pattern); } public void init(IMemento memento) { IMemento mem = mementogetChild(TAG_TYPE); if (mem == null) return; setPattern(memgetString(TAG_PATTERN)); }
These new methods are hooked to the view by adding the following field and methods to the FavoritesView