in Section 822) to notify others when the editor s content has in Java

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in Section 822) to notify others when the editor s content has
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changed We can override this method to set the isPageModified field as appropriate
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public void tableTreeModified() { isPageModified = true; if (!superisDirty()) firePropertyChange(IEditorPartPROP_DIRTY); }
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protected void handlePropertyChange (int propertyId) { if (propertyId == IEditorPartPROP_DIRTY) isPageModified = isDirty(); superhandlePropertyChange(propertyId); }
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Finally, we need to let other registered listeners know when the editor s content is dirty The MultiPageEditorPart s isDirty() method appropriately returns true for the nested text editor on the source page, but knows nothing about modifications to the table tree Overriding this method to add this knowledge causes the Save menu item to be enabled and the editor s title to be updated at the appropriate time
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public boolean isDirty() { return isPageModified || superisDirty(); }
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841 Switching Pages When switching between the Properties and Source pages, any edits made in the Properties page must automatically carry over to the Source page and vice versa To accomplish this, we override the pageChange(int) method to update the page content
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protected void pageChange(int newPageIndex) {
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TT 8 Editors
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switch (newPageIndex) { case 0 : if (isDirty()) updateTableTreeFromTextEditor(); break; case 1 : if (isPageModified) updateTextEditorFromTableTree(); break; } isPageModified = false; superpageChange(newPageIndex); }
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The updateTableTreeFromTextEditor() method has already been defined (see Section 823), but the updateTextEditorFromTableTree() method has not so we ll add it now
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void updateTextEditorFromTableTree() { textEditor getDocumentProvider() getDocument(textEditorgetEditorInput()) set( ((PropertyFile) tableTreeViewergetInput()) asText()); }
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The updateTextEditorFromTableTree() method calls a new asText() method in PropertyFile The new asText() method reverses the parsing process in the PropertyFile s constructor (see Section 823) by reassembling the model into a textual representation
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public String asText() { StringWriter stringWriter = new StringWriter(2000); PrintWriter writer = new PrintWriter(stringWriter);
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unnamedCategoryappendText(writer); Iterator iter = categoriesiterator(); while (iterhasNext()) { writerprintln(); ((PropertyCategory) iternext()) appendText(writer); } return stringWritertoString(); }
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The asText() method calls a new appendText(PrintWriter) method in
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PropertyCategory,
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public void appendText(PrintWriter writer) { if (namelength() > 0) { writerprint("# "); writerprintln(name); } Iterator iter = entriesiterator(); while (iterhasNext()) ((PropertyEntry) iternext())appendText(writer); }
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which then calls a new appendText(PrintWriter) method in PropertyEntry
public void appendText(PrintWriter writer) { writerprint(key); writerprint(" = "); writerprintln(value); }
TT 8 Editors
842 Saving Content Since our current implementation uses the nested text editor to save content into the file being edited, changes on the Properties page will not be noticed unless the user switches to the Source page We must modify the following methods to update the nested text editor before saving Since save operations are typically long running operations, the progress monitor is used to communicate progress to the user (see Section 94):
public void doSave(IProgressMonitor monitor) { if (getActivePage() == 0 && isPageModified) updateTextEditorFromTableTree(); isPageModified = false; textEditordoSave(monitor); } public void doSaveAs() { if (getActivePage() == 0 && isPageModified) updateTextEditorFromTableTree(); isPageModified = false; textEditordoSaveAs(); setInput(textEditorgetEditorInput()); updateTitle(); }
Editor Actions
85 EDITOR ACTIONS
Editor Actions can appear as menu items in the view s context menu, as toolbar buttons in the workbench's toolbar, and as menu items in the workbench's menu (see Figure 6-10) This section covers adding actions to an editor programmatically whereas Section 65 discussed adding actions by using declarations in the plug-in manifest (see Section 1424 for an example of manipulating the content in an existing text editor)
851 Context Menu Typically editors have context menus populated by actions targeted at the editor or the selected objects within the editor There are several steps to creating an editor s context menu and several more steps to register the editor so that others can contribute actions (see Sections 63, 651, and 652 for information concerning how actions are contributed to an editor s context menus via the plug-in manifest)
TT 8 Editors
Creating actions
The first step is to create the menu item actions that appear in the context menu For the Properties editor, we need an action that will remove the selected table tree elements from the editor In addition, this action adds a selection listener to facilitate keeping its enablement state in sync with the current table tree selection
package comqualityeclipsefavoriteseditors; import javautilIterator; import import import import orgeclipsejfaceaction*; orgeclipsejfaceresource*; orgeclipsejfaceviewers*; orgeclipseswtcustom*;
public class RemovePropertiesAction extends Action { private final PropertiesEditor editor; private final TableTreeViewer viewer; private ISelectionChangedListener listener = new ISelectionChangedListener() { public void selectionChanged(SelectionChangedEvent e) { setEnabled(!egetSelection()isEmpty()); } }; public RemovePropertiesAction( PropertiesEditor editor, TableTreeViewer viewer, String text, ImageDescriptor imageDescriptor) {