--- /dev/null
+package net.sourceforge.phpdt.internal.ui.viewsupport;
+
+import java.util.ArrayList;
+
+import org.eclipse.jface.viewers.CheckStateChangedEvent;
+import org.eclipse.jface.viewers.CheckboxTreeViewer;
+import org.eclipse.jface.viewers.ICheckStateListener;
+import org.eclipse.jface.viewers.ITreeViewerListener;
+import org.eclipse.jface.viewers.TreeExpansionEvent;
+import org.eclipse.swt.widgets.Composite;
+import org.eclipse.swt.widgets.Item;
+import org.eclipse.swt.widgets.Tree;
+import org.eclipse.swt.widgets.TreeItem;
+import org.eclipse.swt.widgets.Widget;
+
+/**
+ * CheckboxTreeViewer with special behaviour of the checked / gray state on
+ * container (non-leaf) nodes: The grayed state is used to visualize the checked
+ * state of its children. Containers are checked and non-gary if all contained
+ * leafs are checked. The container is grayed if some but not all leafs are
+ * checked.
+ */
+public class ContainerCheckedTreeViewer extends CheckboxTreeViewer {
+
+ /**
+ * Constructor for ContainerCheckedTreeViewer.
+ *
+ * @see CheckboxTreeViewer#CheckboxTreeViewer(Composite)
+ */
+// public ContainerCheckedTreeViewer(Composite parent) {
+// super(parent);
+// initViewer();
+// }
+
+ /**
+ * Constructor for ContainerCheckedTreeViewer.
+ *
+ * @see CheckboxTreeViewer#CheckboxTreeViewer(Composite,int)
+ */
+ public ContainerCheckedTreeViewer(Composite parent, int style) {
+ super(parent, style);
+ initViewer();
+ }
+
+ /**
+ * Constructor for ContainerCheckedTreeViewer.
+ *
+ * @see CheckboxTreeViewer#CheckboxTreeViewer(Tree)
+ */
+// public ContainerCheckedTreeViewer(Tree tree) {
+// super(tree);
+// initViewer();
+// }
+
+ private void initViewer() {
+ setUseHashlookup(true);
+ addCheckStateListener(new ICheckStateListener() {
+ public void checkStateChanged(CheckStateChangedEvent event) {
+ doCheckStateChanged(event.getElement());
+ }
+ });
+ addTreeListener(new ITreeViewerListener() {
+ public void treeCollapsed(TreeExpansionEvent event) {
+ }
+
+ public void treeExpanded(TreeExpansionEvent event) {
+ Widget item = findItem(event.getElement());
+ if (item instanceof TreeItem) {
+ initializeItem((TreeItem) item);
+ }
+ }
+ });
+ }
+
+ protected void doCheckStateChanged(Object element) {
+ Widget item = findItem(element);
+ if (item instanceof TreeItem) {
+ TreeItem treeItem = (TreeItem) item;
+ treeItem.setGrayed(false);
+ updateChildrenItems(treeItem);
+ updateParentItems(treeItem.getParentItem());
+ }
+ }
+
+ /**
+ * The item has expanded. Updates the checked state of its children.
+ */
+ private void initializeItem(TreeItem item) {
+ if (item.getChecked() && !item.getGrayed()) {
+ updateChildrenItems((TreeItem) item);
+ }
+ }
+
+ /**
+ * Updates the check state of all created children
+ */
+ private void updateChildrenItems(TreeItem parent) {
+ Item[] children = getChildren(parent);
+ boolean state = parent.getChecked();
+ for (int i = 0; i < children.length; i++) {
+ TreeItem curr = (TreeItem) children[i];
+ if (curr.getData() != null
+ && ((curr.getChecked() != state) || curr.getGrayed())) {
+ curr.setChecked(state);
+ curr.setGrayed(false);
+ updateChildrenItems(curr);
+ }
+ }
+ }
+
+ /**
+ * Updates the check / gray state of all parent items
+ */
+ private void updateParentItems(TreeItem item) {
+ if (item != null) {
+ Item[] children = getChildren(item);
+ boolean containsChecked = false;
+ boolean containsUnchecked = false;
+ for (int i = 0; i < children.length; i++) {
+ TreeItem curr = (TreeItem) children[i];
+ containsChecked |= curr.getChecked();
+ containsUnchecked |= (!curr.getChecked() || curr.getGrayed());
+ }
+ item.setChecked(containsChecked);
+ item.setGrayed(containsChecked && containsUnchecked);
+ updateParentItems(item.getParentItem());
+ }
+ }
+
+ public boolean setChecked(Object element, boolean state) {
+ if (super.setChecked(element, state)) {
+ doCheckStateChanged(element);
+ return true;
+ }
+ return false;
+ }
+
+ public void setCheckedElements(Object[] elements) {
+ super.setCheckedElements(elements);
+ for (int i = 0; i < elements.length; i++) {
+ doCheckStateChanged(elements[i]);
+ }
+ }
+
+ protected void setExpanded(Item item, boolean expand) {
+ super.setExpanded(item, expand);
+ if (expand && item instanceof TreeItem) {
+ initializeItem((TreeItem) item);
+ }
+ }
+
+ public Object[] getCheckedElements() {
+ Object[] checked = super.getCheckedElements();
+ // add all items that are children of a checked node but not created yet
+ ArrayList result = new ArrayList();
+ for (int i = 0; i < checked.length; i++) {
+ Object curr = checked[i];
+ result.add(curr);
+ Widget item = findItem(curr);
+ if (item != null) {
+ Item[] children = getChildren(item);
+ // check if contains the dummy node
+ if (children.length == 1 && children[0].getData() == null) {
+ // not yet created
+ collectChildren(curr, result);
+ }
+ }
+ }
+ return result.toArray();
+ }
+
+ private void collectChildren(Object element, ArrayList result) {
+ Object[] filteredChildren = getFilteredChildren(element);
+ for (int i = 0; i < filteredChildren.length; i++) {
+ Object curr = filteredChildren[i];
+ result.add(curr);
+ collectChildren(curr, result);
+ }
+ }
+
+}
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