Content provider in Java

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824 Content provider
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All these model objects are useless unless they can be properly displayed in the tree To accomplish this, you need to create a content provider and label provider The content provider provides the rows appearing in the tree along with parent/child relationships, but not the actual cell content
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package comqualityeclipsefavoriteseditors; import public class PropertiesEditorContentProvider implements ITreeContentProvider { public void inputChanged( Viewer viewer, Object oldInput, Object newInput ) { } public Object[] getElements(Object element) { return getChildren(element); } public Object[] getChildren(Object element) { if (element instanceof PropertyElement) return ((PropertyElement) element)getChildren(); return null; } public Object getParent(Object element) { if (element instanceof PropertyElement) return ((PropertyElement) element)getParent(); return null; }
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public boolean hasChildren(Object element) { if (element instanceof PropertyElement) return ((PropertyElement) element)getChildren()length > 0; return false; } public void dispose() { } }
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825 Label provider
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The label provider converts the row element object as returned by the content provider into images and text that can be displayed in the table cells
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package comqualityeclipsefavoriteseditors; import public class PropertiesEditorLabelProvider extends LabelProvider implements ITableLabelProvider { public Image getColumnImage(Object element, int columnIndex) { return null; } public String getColumnText(Object element, int columnIndex) { if (element instanceof PropertyCategory) { PropertyCategory category = (PropertyCategory) element; switch (columnIndex) { case 0 : return categorygetName(); case 1 : return ""; } } if (element instanceof PropertyEntry) { PropertyEntry entry = (PropertyEntry) element; switch (columnIndex) { case 0 : return entrygetKey(); case 1 : return entrygetValue(); } } if (element == null) return "<null>"; return elementtoString(); } }
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Finally, you need to add a new initTreeContent() method, called from the createPages() method, to associate the new content and label providers with the tree This method is followed by another new method to synchronize the text editor s content with the tree s content The call to asyncExec() ensures that the updateTreeFromTextEditor method is executed in the UI thread (see Section 4251, Display, on page 148 for more on the UI thread) The updateTreeFromTextEditor() method indirectly references code in the orgeclipsejfacetext plug-in, so it must be added to the Favorites plugin s manifest (see Figure 2 10 on page 79)
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private PropertiesEditorContentProvider treeContentProvider; private PropertiesEditorLabelProvider treeLabelProvider; void initTreeContent() { treeContentProvider = new PropertiesEditorContentProvider(); treeViewersetContentProvider(treeContentProvider); treeLabelProvider = new PropertiesEditorLabelProvider(); treeViewersetLabelProvider(treeLabelProvider); // Reset the input from the text editor s content // after the editor initialization has completed treeViewersetInput(new PropertyFile("")); treeViewergetTree()getDisplay()asyncExec(new Runnable() { public void run() { updateTreeFromTextEditor(); } }); treeViewersetAutoExpandLevel(TreeViewerALL_LEVELS); } void updateTreeFromTextEditor() { PropertyFile propertyFile = new PropertyFile( textEditor getDocumentProvider() getDocument(textEditorgetEditorInput()) get()); treeViewersetInput(propertyFile); }
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When all this has been accomplished, the Properties editor s Properties page will have some content (see Figure 8 5)
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Editors
Figure 8 5
Properties editor with new content
Editing
When the Properties page displays the content in a tree, it is important to edit the content without having to switch to the Source page (see Section 1424, Marker resolution quick fix, on page 556 for an example of manipulating the content in an existing text editor)
831 Cell editors
Similar to the createInlineEditor method (Section 739, Inline editing, on page 333), create a new initTreeEditors() method, which is called from createPages() This method initializes two TreeViewerColumn instances responsible for managing the cell editor in the key and value columns respectively:
TreeViewerColumn column1 = new TreeViewerColumn(treeViewer, keyColumn); TreeViewerColumn column2 = new TreeViewerColumn(treeViewer, valueColumn);
Each TreeViewerColumn has a ColumnLabelProvider associated with it:
column1setLabelProvider(new ColumnLabelProvider() { public String getText(Object element) { return treeLabelProvidergetColumnText(element, 0); } }); column2setLabelProvider(new ColumnLabelProvider() { public String getText(Object element) { return treeLabelProvidergetColumnText(element, 1); } });
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83 Editing
In the first column, the user can edit either the category name or the key of a key/value pair EditingSupport is responsible for instantiating an appropriate cell editor, obtaining the appropriate text for cell editor, and saving the modified text back into the model
column1setEditingSupport(new EditingSupport(treeViewer) { TextCellEditor editor = null; protected boolean canEdit(Object element) { return true; } protected CellEditor getCellEditor(Object element) { if (editor == null) { Composite tree = (Composite) treeViewergetControl(); editor = new TextCellEditor(tree); } return editor; } protected Object getValue(Object element) { return treeLabelProvidergetColumnText(element, 0); } protected void setValue(Object element, Object value) { String text = ((String) value)trim(); if (element instanceof PropertyCategory) ((PropertyCategory) element)setName(text); if (element instanceof PropertyEntry) ((PropertyEntry) element)setKey(text); } });
We create a similar EditingSupport object for the second column, but modify it to allow editing of the value in a key/value pair:
column2setEditingSupport(new EditingSupport(treeViewer) { TextCellEditor editor = null; protected boolean canEdit(Object element) { return element instanceof PropertyEntry; } protected CellEditor getCellEditor(Object element) { if (editor == null) { Composite tree = (Composite) treeViewergetControl(); editor = new TextCellEditor(tree); } return editor; } protected Object getValue(Object element) { return treeLabelProvidergetColumnText(element, 1); }