コード例 #1
0
        /// <summary>
        /// Extracts the value of the hidden field, which is the expansion state of all the nodes written
        /// as a sequence of characters that are one of the following three:
        /// 'e' - expanded, 'c' - collapsed, 'l' - leaf
        /// At this point the controls collection has been rebuilt so we go through the expansion state
        /// string, one character at a time and assign the container controls IsExpanded property based on
        /// the character.
        /// </summary>
        /// <param name="postDataKey">Unique ID of this tree</param>
        /// <param name="postCollection">Collection that contains the posted fields, including the hidden field we need.</param>
        /// <returns></returns>
        public bool LoadPostData(string postDataKey, NameValueCollection postCollection)
        {
            //this is the value of the hidden field that is written by javascript
            //and returned in the postCollection
            string postedExpansionState = postCollection[postDataKey + this.IdSeparator + this._hiddenFieldId];

            int count = 0;

            foreach (char c in postedExpansionState)
            {
                if (this.Controls[count] is TemplatedTreeViewNodeContainer)
                {
                    TemplatedTreeViewNodeContainer container = (TemplatedTreeViewNodeContainer)this.Controls[count];
                    switch (c)
                    {
                    case 'e':
                    {
                        container.IsExpanded = true;
                        break;
                    }

                    case 'c':
                    {
                        container.IsExpanded = false;
                        break;
                    }
                    }
                }
                count++;
            }
            return(false);
        }
コード例 #2
0
        private void ExpandNodesToParent(TemplatedTreeViewNodeContainer node)
        {
            int currentDepth = node.Depth;

            int indexOfNode = this.Controls.IndexOf(node);

            if (indexOfNode >= 0)
            {
                for (int i = indexOfNode; i >= 0; i--)
                {
                    if (currentDepth == 0)
                    {
                        break;
                    }

                    TemplatedTreeViewNodeContainer checkNode = (TemplatedTreeViewNodeContainer)this.Controls[i];
                    if (checkNode.Depth == currentDepth)
                    {
                        if (checkNode.HasChildren)
                        {
                            checkNode.IsExpanded = true;
                        }
                        currentDepth--;
                    }
                }
            }
        }
コード例 #3
0
        /// <summary>
        /// Renders the tree view control, the hidden field to store the expansion state,
        /// and the associated javascript
        /// </summary>
        /// <param name="writer"></param>
        protected override void RenderContents(HtmlTextWriter writer)
        {
            int pos         = 0;
            int endingDepth = 1;

            writer.AddAttribute(HtmlTextWriterAttribute.Class, "rootlist");
            writer.AddAttribute(HtmlTextWriterAttribute.Id, this.ClientID + this.ClientIDSeparator + "rootlist");
            writer.RenderBeginTag(HtmlTextWriterTag.Ul);

            while (pos < this.Controls.Count)
            {
                TemplatedTreeViewNodeContainer ctrl = (TemplatedTreeViewNodeContainer)this.Controls[pos];

                //If the current depth is less than the previous depth then close all of the
                //ul li elements until we are at the correct depth.
                if (pos != 0)
                {
                    int prevDepth = ((TemplatedTreeViewNodeContainer)this.Controls[pos - 1]).Depth;
                    if (ctrl.Depth < prevDepth)
                    {
                        ChangeDepth(writer, prevDepth, ctrl.Depth);
                    }
                }

                //Draw the opening li
                writer.Indent++;
                writer.AddAttribute(HtmlTextWriterAttribute.Id, this.ClientID + this.ClientIDSeparator + "ttvnode" + this.ClientIDSeparator + pos.ToString());
                writer.AddAttribute(HtmlTextWriterAttribute.Class, GetClassesForNode(ctrl));
                writer.RenderBeginTag(HtmlTextWriterTag.Li);

                //Render the actual contents of the Node
                ctrl.RenderControl(writer);

                if (!ctrl.HasChildren)
                {
                    //Close out the li of this node since there are no children.
                    writer.RenderEndTag();
                    writer.Indent--;
                    writer.WriteLine();
                }
                else
                {
                    //This has children so we need to draw an opening ul
                    writer.Indent++;
                    writer.RenderBeginTag(HtmlTextWriterTag.Ul);
                }

                endingDepth = ctrl.Depth;
                pos++;
            }

            if (endingDepth != 1)
            {
                ChangeDepth(writer, endingDepth, 1);
            }

            writer.RenderEndTag();
        }
コード例 #4
0
        /// <summary>
        /// If this is not a postback, then the control properties have been loaded from viewstate
        /// and the CreateChildControls uses this method to create each child control of
        /// type TemplatedTreeViewNodeContainer. There is no node here to copy the properties from, but at this
        /// point, the properties are repopulated from the viewstate of each control. The template is
        /// recreated here for each control and instantiated in the container control.
        /// The TemplateType list has been restored from the ViewState of the tree view and we can access
        /// the template types by index (passed in controlNumber). We have to also save off this list so it
        /// can later be stored in ViewState again.
        /// </summary>
        /// <param name="controlNumber"></param>
        private void CreateControl(int controlNumber)
        {
            TemplatedTreeViewNodeContainer container = new TemplatedTreeViewNodeContainer(TemplateTypes[controlNumber]);

            this.Controls.Add(container);
            ITemplate nodeTemplate = Templates[TemplateTypes[controlNumber]];

            nodeTemplate.InstantiateIn(container);
        }
コード例 #5
0
        private string GetClassesForNode(TemplatedTreeViewNodeContainer ctrl)
        {
            string classes = "ttvnode";

            if (!string.IsNullOrEmpty(ctrl.TemplateType))
            {
                classes += " " + ctrl.TemplateType;
            }

            if (!ctrl.HasChildren)
            {
                classes += " ttvleaf";
            }

            if (ctrl.IsSelected)
            {
                classes += " selected";
            }

            return(classes);
        }
コード例 #6
0
        /// <summary>
        /// Called from CreateChildControls if this is not a postback. Creates an instance of
        /// TemplatedTreeViewNodeContainer and sets some of its properties based on the node passed in.
        /// This is where the template is created and instantiated in the container control.
        /// When we post back, we will need to recreate these controls, but will not have the nodes
        /// available and therefore, will not have the NodeType (or TemplateType) available either.
        /// So for each of these controls, we store the string of the NodeType into a list
        /// (_templateTypeList) that will be restored when the ViewState of the tree view gets restored.
        /// </summary>
        /// <param name="node"></param>
        private void CreateControlFromNode(ITemplatedTreeNode node)
        {
            TemplatedTreeViewNodeContainer container = new TemplatedTreeViewNodeContainer(node.ItemType, node.Data);

            this.Controls.Add(container);
            container.TreeNodeId = node.TemplatedTreeNodeID;
            container.Path       = node.Path;

            container.IsExpanded  = node.IsExpanded;
            container.IsSelected  = node.IsSelected;
            container.HasChildren = node.HasChildren;


            ITemplate nodeTemplate = Templates[node.ItemType];

            if (nodeTemplate != null)
            {
                nodeTemplate.InstantiateIn(container);
                container.DataBind();
            }
        }