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Create PDF 417 in Font ADVANCED WEB PART TECHNIQUES

CHAPTER 3 ADVANCED WEB PART TECHNIQUES
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protected override void RenderWebPart(HtmlTextWriter output) { //get this web SPSite site = SPControl.GetContextSite(Context); SPWeb web = site.OpenWeb(); //add tree root TreeNode root = new TreeNode(); root.Text = web.Title; root.ImageUrl = "/_layouts/images/globe.gif"; root.Expanded = true; tree.Nodes.Add(root); //add children addChildNodes(root,web); //display tree tree.RenderControl(output); } private void addChildNodes(TreeNode parentNode, SPWeb parentWeb) { //get child webs SPWebCollection webs = parentWeb.GetSubwebsForCurrentUser(); foreach(SPWeb sub in webs) { //add to tree TreeNode node = new TreeNode(); node.Text = sub.Title; node.ImageUrl = "/_layouts/images/asp16.gif"; node.NavigateUrl = sub.Url; node.Target = ""; parentNode.Nodes.Add(node); //recurse addChildNodes(node,sub); } } } } If you examine the code in Listing 3-1, you ll see that each node added to the tree is assigned a value for the Text, NavigateUrl, Target, and ImageUrl properties. The Text property is used to provide the caption for the node. The NavigateUrl property is used to specify a location to open when the node is clicked. The Target property is set to an empty string to force the navigation to occur within the same browser, but you could set it to open a new window as well.
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The ImageUrl is used to specify an image for the node. In the example, the node uses an image already available from the WSS installation. This is a great technique because WSS provides many images that are already sized appropriately for use with the TreeView control. The URL /_layouts/images corresponds to the directory \Program Files\Common Files\ Microsoft Shared\web server extensions\60\Templates\images. You can use any of the images located in this directory or even place your own images in this directory. Additionally, you can make use of the images not just for the standard image property, but also for images that appear when the node is expanded or selected using the ExpandedImageUrl and SelectedImageUrl properties, respectively.
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Using the Toolbar Control
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The Toolbar control allows you to create a toolbar for your web parts similar to those found in standard Microsoft Office products. It provides several styles of buttons, including simple push buttons, state buttons, and list buttons. I find this control useful for easily changing options or settings for a web part when a round-trip to the server is required. As an example, Figure 3-3 shows a text editor web part that uses the Toolbar control to alter the font style.
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Figure 3-3. The Toolbar control
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Using the Toolbar control begins by creating an instance in the CreateChildControls method. Just as the TreeView object was a container for node objects, the Toolbar object is a container for button objects. Therefore, you must create an instance of a particular button object and add it to the Items collection of the Toolbar object. The toolbar supports several button styles that allow you to implement different types of functionality. Table 3-1 lists the available button types along with a description.
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Table 3-1. Supported Button Types
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Button Type
ToolbarButton ToolbarCheckButton ToolbarDropDownList ToolbarLabel ToolbarSeparator ToolbarTextBox
Description
A simple push button control that fires a server-side event A stateful button that remains depressed when clicked A list control that displays the currently selected item on the toolbar A simple text control displayed on the toolbar A separator used to visually group sets of buttons on the toolbar An editable text control displayed on the toolbar
Each of the button types has an appropriate set of properties that allow you to change the appearance or manipulate their contents. Most of these properties are similar to those found in similar stand-alone controls. For example, the SelectedItem property of the ToolbarDropDownList object returns the currently selected list item just as it does in a standard ASP .NET ListBox object. For this reason, you will find that learning how to use each button type is fairly straightforward. When you interact with any toolbar button, server-side events are generated that are trapped at the toolbar level. For example, clicking any button will cause the ButtonClick event to fire for the Toolbar object. You can then determine which button was clicked by examining the sender object, which contains the ID of the clicked button. It is, therefore, a good idea to assign a unique String value to each button s ID property so that you can detect it in the toolbar events. The following code shows an example of using a Select-Case statement in Visual Basic .NET to determine which button in a toolbar was clicked: Private Sub objToolbar_ButtonClick _ (ByVal sender As Object, ByVal e As System.EventArgs) _ Handles objToolbar.ButtonClick Select Case sender.ToString Case "Button1" . . . Case "Button2" . . . Case "Button3" . . . End Select End Sub Once you understand the basics of creating the toolbar, adding buttons, and trapping the events, you can easily add the control to your web parts. Because the control is a server-side control with ViewState support, the toolbar can even be used to maintain state without the
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