--- /dev/null
+package org.argeo.cms.ui.viewers;
+
+import java.security.AccessControlContext;
+import java.security.AccessController;
+import java.security.PrivilegedAction;
+import java.util.Observable;
+import java.util.Observer;
+
+import javax.jcr.Node;
+import javax.jcr.RepositoryException;
+import javax.jcr.Session;
+import javax.security.auth.Subject;
+
+import org.argeo.api.cms.CmsLog;
+import org.argeo.api.cms.ux.CmsEditable;
+import org.argeo.cms.swt.SwtEditablePart;
+import org.argeo.cms.swt.widgets.ScrolledPage;
+import org.argeo.jcr.JcrException;
+import org.eclipse.jface.viewers.ContentViewer;
+import org.eclipse.jface.viewers.ISelection;
+import org.eclipse.jface.viewers.StructuredSelection;
+import org.eclipse.swt.SWT;
+import org.eclipse.swt.events.FocusEvent;
+import org.eclipse.swt.events.FocusListener;
+import org.eclipse.swt.events.MouseAdapter;
+import org.eclipse.swt.events.MouseListener;
+import org.eclipse.swt.widgets.Composite;
+import org.eclipse.swt.widgets.Control;
+import org.eclipse.swt.widgets.Widget;
+import org.xml.sax.SAXParseException;
+
+/** Base class for viewers related to a page */
+public abstract class AbstractPageViewer extends ContentViewer implements Observer {
+ private static final long serialVersionUID = 5438688173410341485L;
+
+ private final static CmsLog log = CmsLog.getLog(AbstractPageViewer.class);
+
+ private final boolean readOnly;
+ /** The basis for the layouts, typically a ScrolledPage. */
+ private final Composite page;
+ private final CmsEditable cmsEditable;
+
+ private MouseListener mouseListener;
+ private FocusListener focusListener;
+
+ private SwtEditablePart edited;
+ private ISelection selection = StructuredSelection.EMPTY;
+
+ private AccessControlContext accessControlContext;
+
+ protected AbstractPageViewer(Section parent, int style, CmsEditable cmsEditable) {
+ // read only at UI level
+ readOnly = SWT.READ_ONLY == (style & SWT.READ_ONLY);
+
+ this.cmsEditable = cmsEditable == null ? CmsEditable.NON_EDITABLE : cmsEditable;
+ if (this.cmsEditable instanceof Observable)
+ ((Observable) this.cmsEditable).addObserver(this);
+
+ if (cmsEditable.canEdit()) {
+ mouseListener = createMouseListener();
+ focusListener = createFocusListener();
+ }
+ page = findPage(parent);
+ accessControlContext = AccessController.getContext();
+ }
+
+ /**
+ * Can be called to simplify the called to isModelInitialized() and initModel()
+ */
+ protected void initModelIfNeeded(Node node) {
+ try {
+ if (!isModelInitialized(node))
+ if (getCmsEditable().canEdit()) {
+ initModel(node);
+ node.getSession().save();
+ }
+ } catch (RepositoryException e) {
+ throw new JcrException("Cannot initialize model", e);
+ }
+ }
+
+ /** Called if user can edit and model is not initialized */
+ protected Boolean isModelInitialized(Node node) throws RepositoryException {
+ return true;
+ }
+
+ /** Called if user can edit and model is not initialized */
+ protected void initModel(Node node) throws RepositoryException {
+ }
+
+ /** Create (retrieve) the MouseListener to use. */
+ protected MouseListener createMouseListener() {
+ return new MouseAdapter() {
+ private static final long serialVersionUID = 1L;
+ };
+ }
+
+ /** Create (retrieve) the FocusListener to use. */
+ protected FocusListener createFocusListener() {
+ return new FocusListener() {
+ private static final long serialVersionUID = 1L;
+
+ @Override
+ public void focusLost(FocusEvent event) {
+ }
+
+ @Override
+ public void focusGained(FocusEvent event) {
+ }
+ };
+ }
+
+ protected Composite findPage(Composite composite) {
+ if (composite instanceof ScrolledPage) {
+ return (ScrolledPage) composite;
+ } else {
+ if (composite.getParent() == null)
+ return composite;
+ return findPage(composite.getParent());
+ }
+ }
+
+ public void layoutPage() {
+ if (page != null)
+ page.layout(true, true);
+ }
+
+ protected void showControl(Control control) {
+ if (page != null && (page instanceof ScrolledPage))
+ ((ScrolledPage) page).showControl(control);
+ }
+
+ @Override
+ public void update(Observable o, Object arg) {
+ if (o == cmsEditable)
+ editingStateChanged(cmsEditable);
+ }
+
+ /** To be overridden in order to provide the actual refresh */
+ protected void refresh(Control control) throws RepositoryException {
+ }
+
+ /** To be overridden.Save the edited part. */
+ protected void save(SwtEditablePart part) throws RepositoryException {
+ }
+
+ /** Prepare the edited part */
+ protected void prepare(SwtEditablePart part, Object caretPosition) {
+ }
+
+ /** Notified when the editing state changed. Does nothing, to be overridden */
+ protected void editingStateChanged(CmsEditable cmsEditable) {
+ }
+
+ @Override
+ public void refresh() {
+ // TODO check actual context in order to notice a discrepancy
+ Subject viewerSubject = getViewerSubject();
+ Subject.doAs(viewerSubject, (PrivilegedAction<Void>) () -> {
+ try {
+ if (cmsEditable.canEdit() && !readOnly)
+ mouseListener = createMouseListener();
+ else
+ mouseListener = null;
+ refresh(getControl());
+ // layout(getControl());
+ if (!getControl().isDisposed())
+ layoutPage();
+ } catch (RepositoryException e) {
+ throw new JcrException("Cannot refresh", e);
+ }
+ return null;
+ });
+ }
+
+ @Override
+ public void setSelection(ISelection selection, boolean reveal) {
+ this.selection = selection;
+ }
+
+ protected void updateContent(SwtEditablePart part) throws RepositoryException {
+ }
+
+ // LOW LEVEL EDITION
+ protected void edit(SwtEditablePart part, Object caretPosition) {
+ try {
+ if (edited == part)
+ return;
+
+ if (edited != null && edited != part) {
+ SwtEditablePart previouslyEdited = edited;
+ try {
+ stopEditing(true);
+ } catch (Exception e) {
+ notifyEditionException(e);
+ edit(previouslyEdited, caretPosition);
+ return;
+ }
+ }
+
+ part.startEditing();
+ edited = part;
+ updateContent(part);
+ prepare(part, caretPosition);
+ edited.getControl().addFocusListener(new FocusListener() {
+ private static final long serialVersionUID = 6883521812717097017L;
+
+ @Override
+ public void focusLost(FocusEvent event) {
+ stopEditing(true);
+ }
+
+ @Override
+ public void focusGained(FocusEvent event) {
+ }
+ });
+
+ layout(part.getControl());
+ showControl(part.getControl());
+ } catch (RepositoryException e) {
+ throw new JcrException("Cannot edit " + part, e);
+ }
+ }
+
+ protected void stopEditing(Boolean save) {
+ if (edited instanceof Widget && ((Widget) edited).isDisposed()) {
+ edited = null;
+ return;
+ }
+
+ assert edited != null;
+ if (edited == null) {
+ if (log.isTraceEnabled())
+ log.warn("Told to stop editing while not editing anything");
+ return;
+ }
+
+ try {
+ if (save)
+ save(edited);
+
+ edited.stopEditing();
+ SwtEditablePart editablePart = edited;
+ Control control = ((SwtEditablePart) edited).getControl();
+ edited = null;
+ // TODO make edited state management more robust
+ updateContent(editablePart);
+ layout(control);
+ } catch (RepositoryException e) {
+ throw new JcrException("Cannot stop editing", e);
+ } finally {
+ edited = null;
+ }
+ }
+
+ // METHODS AVAILABLE TO EXTENDING CLASSES
+ protected void saveEdit() {
+ if (edited != null)
+ stopEditing(true);
+ }
+
+ protected void cancelEdit() {
+ if (edited != null)
+ stopEditing(false);
+ }
+
+ /** Layout this controls from the related base page. */
+ public void layout(Control... controls) {
+ page.layout(controls);
+ }
+
+ /**
+ * Find the first {@link SwtEditablePart} in the parents hierarchy of this control
+ */
+ protected SwtEditablePart findDataParent(Control parent) {
+ if (parent instanceof SwtEditablePart) {
+ return (SwtEditablePart) parent;
+ }
+ if (parent.getParent() != null)
+ return findDataParent(parent.getParent());
+ else
+ throw new IllegalStateException("No data parent found");
+ }
+
+ // UTILITIES
+ /** Check whether the edited part is in a proper state */
+ protected void checkEdited() {
+ if (edited == null || (edited instanceof Widget) && ((Widget) edited).isDisposed())
+ throw new IllegalStateException("Edited should not be null or disposed at this stage");
+ }
+
+ /** Persist all changes. */
+ protected void persistChanges(Session session) throws RepositoryException {
+ session.save();
+ session.refresh(false);
+ // TODO notify that changes have been persisted
+ }
+
+ /** Convenience method using a Node in order to save the underlying session. */
+ protected void persistChanges(Node anyNode) throws RepositoryException {
+ persistChanges(anyNode.getSession());
+ }
+
+ /** Notify edition exception */
+ protected void notifyEditionException(Throwable e) {
+ Throwable eToLog = e;
+ if (e instanceof IllegalArgumentException)
+ if (e.getCause() instanceof SAXParseException)
+ eToLog = e.getCause();
+ log.error(eToLog.getMessage(), eToLog);
+// if (log.isTraceEnabled())
+// log.trace("Full stack of " + eToLog.getMessage(), e);
+ // TODO Light error notification popup
+ }
+
+ protected Subject getViewerSubject() {
+ Subject res = null;
+ if (accessControlContext != null) {
+ res = Subject.getSubject(accessControlContext);
+ }
+ if (res == null)
+ throw new IllegalStateException("No subject associated with this viewer");
+ return res;
+ }
+
+ // GETTERS / SETTERS
+ public boolean isReadOnly() {
+ return readOnly;
+ }
+
+ protected SwtEditablePart getEdited() {
+ return edited;
+ }
+
+ public MouseListener getMouseListener() {
+ return mouseListener;
+ }
+
+ public FocusListener getFocusListener() {
+ return focusListener;
+ }
+
+ public CmsEditable getCmsEditable() {
+ return cmsEditable;
+ }
+
+ @Override
+ public ISelection getSelection() {
+ return selection;
+ }
+}
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projects / lgpl / argeo-commons.git / blobdiff