From 57cceb716df9d6373387c573607f84607e760047 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=93scar=20Gonz=C3=A1lez=20Fern=C3=A1ndez?=
 <ogonzalez@igalia.com>
Date: Fri, 24 Jul 2009 17:48:46 +0200
Subject: [PATCH] ItEr19S08CUCreacionProxectoPlanificacionItEr18S08: Fixing
 problem in left tree. When adding a task that contained other children, only
 top node was added.

---
 .../java/org/zkoss/ganttz/LeftTasksTree.java  | 92 ++++++++++++++++---
 1 file changed, 77 insertions(+), 15 deletions(-)

diff --git a/navalplanner-gantt-zk/src/main/java/org/zkoss/ganttz/LeftTasksTree.java b/navalplanner-gantt-zk/src/main/java/org/zkoss/ganttz/LeftTasksTree.java
index 5f72344d4..b88fdfc59 100644
--- a/navalplanner-gantt-zk/src/main/java/org/zkoss/ganttz/LeftTasksTree.java
+++ b/navalplanner-gantt-zk/src/main/java/org/zkoss/ganttz/LeftTasksTree.java
@@ -1,6 +1,8 @@
 package org.zkoss.ganttz;
 
+import java.lang.reflect.Method;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Calendar;
 import java.util.Date;
 import java.util.HashMap;
@@ -52,6 +54,7 @@ public class LeftTasksTree extends HtmlMacroComponent {
                 cell.setSclass(cssClass);
             }
             detailsForBeans.put(task, leftTasksTreeRow);
+            deferredFiller.isBeingRendered(task, item);
         }
 
         private void expandWhenOpened(final TaskContainer taskBean,
@@ -142,8 +145,7 @@ public class LeftTasksTree extends HtmlMacroComponent {
             return null;
         }
 
-        public List<ChildAndParent> group(Task origin,
-                List<Task> parents) {
+        public List<ChildAndParent> group(Task origin, List<Task> parents) {
             ArrayList<ChildAndParent> result = new ArrayList<ChildAndParent>();
             Task child = origin;
             Task parent;
@@ -207,8 +209,62 @@ public class LeftTasksTree extends HtmlMacroComponent {
 
     }
 
+    /**
+     * This class is a workaround for an issue with zk {@link Tree}. Once the
+     * tree is created, a node with more children can't be added. Only the top
+     * element is added to the tree, although the element has children. The Tree
+     * discards the adding event for the children because the parent says it's
+     * not loaded. This is the condition that is not satisfied:<br />
+     * <code>if(parent != null &&
+        (!(parent instanceof Treeitem) || ((Treeitem)parent).isLoaded())){</code><br />
+     * This problem is present in zk 3.6.1 at least.
+     * @author Óscar González Fernández <ogonzalez@igalia.com>
+     * @see Tree#onTreeDataChange
+     */
+    private class DeferredFiller {
+
+        private Set<Task> pendingToAddChildren = new HashSet<Task>();
+
+        public void addParentOfPendingToAdd(Task parent) {
+            pendingToAddChildren.add(parent);
+        }
+
+        public void isBeingRendered(final Task parent, final Treeitem item) {
+            if (!pendingToAddChildren.contains(parent))
+                return;
+            markLoaded(item);
+            fillModel(parent, parent.getTasks(), false);
+            pendingToAddChildren.remove(parent);
+        }
+
+        private void markLoaded(Treeitem item) {
+            try {
+                Method method = getSetLoadedMethod();
+                method.invoke(item, true);
+            } catch (Exception e) {
+                throw new RuntimeException(e);
+            }
+        }
+        private Method setLoadedMethod = null;
+
+        private Method getSetLoadedMethod() {
+            if (setLoadedMethod != null)
+                return setLoadedMethod;
+            try {
+                Method method = Treeitem.class.getDeclaredMethod("setLoaded",
+                        Boolean.TYPE);
+                method.setAccessible(true);
+                return setLoadedMethod = method;
+            } catch (Exception e) {
+                throw new RuntimeException(e);
+            }
+        }
+    }
+
     private static Log LOG = LogFactory.getLog(LeftTasksTree.class);
 
+    private final DeferredFiller deferredFiller = new DeferredFiller();
+
     private final List<Task> tasks;
 
     private MutableTreeModel<Task> tasksTreeModel;
@@ -221,19 +277,25 @@ public class LeftTasksTree extends HtmlMacroComponent {
         this.tasks = tasks;
     }
 
-    private static void fillModel(MutableTreeModel<Task> treeModel,
-            List<Task> tasks) {
-        for (Task task : tasks) {
-            fillModel(treeModel, treeModel.getRoot(), task);
-        }
+    private void fillModel(List<Task> tasks, boolean firstTime) {
+        fillModel(this.tasksTreeModel.getRoot(), tasks, firstTime);
     }
 
-    private static void fillModel(MutableTreeModel<Task> treeModel,
-            Task parent, Task node) {
-        treeModel.add(parent, node);
-        if (node.isContainer()) {
-            for (Task child : node.getTasks()) {
-                fillModel(treeModel, node, child);
+    private void fillModel(Task parent, List<Task> children,
+            final boolean firstTime) {
+        for (Task node : children) {
+            if (firstTime) {
+                this.tasksTreeModel.add(parent, node);
+                if (node.isContainer()) {
+                    fillModel(node, node.getTasks(), firstTime);
+                }
+            } else {
+                if (node.isContainer()) {
+                    this.deferredFiller.addParentOfPendingToAdd(node);
+                }
+                // the node must be added after, so the multistepTreeFiller is
+                // ready
+                this.tasksTreeModel.add(parent, node);
             }
         }
     }
@@ -259,14 +321,14 @@ public class LeftTasksTree extends HtmlMacroComponent {
         super.afterCompose();
         tasksTree = (Tree) getFellow("tasksTree");
         tasksTreeModel = MutableTreeModel.create(Task.class);
-        fillModel(tasksTreeModel, tasks);
+        fillModel(tasks, true);
         tasksTree.setModel(tasksTreeModel);
         tasksTree.setTreeitemRenderer(new TaskBeanRenderer());
     }
 
     void addTask(Task task) {
+        fillModel(Arrays.asList(task), false);
         detailsForBeans.requestFocusFor(task);
-        tasksTreeModel.add(tasksTreeModel.getRoot(), task);
     }
 
     public CommandContextualized<?> getGoingDownInLastArrowCommand() {