GeckoFx (4)使用 treeview 展示 dom 数树

- 日理万妓 2024-02-17 17:57 12阅读 0赞

GeckoFx (4)使用 treeview 展示 dom 数树  
使用 DocumentCompleted 事件，在页面加载完成后构建一个 dom 树使用 treeview 控件。  
treeHtml： treeview 控件；  
browser：Gecko.GeckoWebBrowser 控件；  
  
  
注册事件：

browser.DocumentCompleted += browser\_DocumentCompleted;

/// <summary>
    /// 文档加载完成事件
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    void browser_DocumentCompleted(object sender, Gecko.Events.GeckoDocumentCompletedEventArgs e)
    {
    	ShowHtmlTree();
    }
    
    /// <summary>
    /// 构建dom树
    /// </summary>
    private void ShowHtmlTree()
    {
    	this.treeHtml.Nodes.Clear();
    	var domRoot = browser.DomDocument;
    	StringBuilder attrStr = new StringBuilder();
    	Func<GeckoNode, string> getTag = (node) =>
    	{
    		attrStr.Clear();
    		if (node.NodeName.Equals("STYLE") ||
    			node.NodeName.Equals("SCRIPT"))
    		{
    			return string.Format("<{0}>...</{0}>",node.NodeName.ToLower());
    		}
    		//var element = node as GeckoHtmlElement;
    		string innerText = string.Empty;
    		GeckoElement element = node.GetEventTarget().CastToGeckoElement();
    		//
    		if (element != null && 
    			element.ChildNodes.Count()==1 &&
    			element.ChildNodes[0].NodeType == NodeType.Text)
    		{
    			innerText = element.TextContent;
    		}
    		attrStr.AppendFormat("<{0}", node.NodeName.ToLower());
    		//构建属性
    		if (node.HasAttributes && element != null)
    		{
    			foreach (var attr in element.Attributes)
    			{
    				attrStr.Append(
    					string.Format(" {0}=\"{1}\"", attr.NodeName, attr.NodeValue));
    			}
    		}
    		//内容
    		attrStr.AppendFormat(">{0}</{1}>", innerText, node.NodeName.ToLower());
    		return attrStr.ToString();
    	};
    	//递归构建树
    	Func<GeckoNode, TreeNode> buildTree = null;
    	buildTree = (rNode) =>
    	{
    		if (rNode == null)
    			return null;
    		TreeNode tnode = new TreeNode()
    		{
    			Text = getTag(rNode),
    			Tag = rNode
    		};
    		if (rNode.ChildNodes == null || !rNode.ChildNodes.Any())
    			return null;
    		foreach (var cNode in rNode.ChildNodes)
    		{
    			var ctnode = buildTree(cNode);
    			if (ctnode != null)
    				tnode.Nodes.Add(ctnode);
    		}
    		return tnode;
    	};
    	var treeRoot = buildTree(domRoot);
    	if (treeRoot!=null)
    		this.treeHtml.Nodes.Add(treeRoot);
    	this.treeHtml.ExpandAll();
    }