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It also provides the editing-canceled and editing-started signals, which allow you to implement editing in custom cell renderers In Listing 8-1, you were introduced to GtkCellRendererText, which is capable of rendering strings, numbers, and gboolean values as text Textual cell renderers are initialized with gtk_cell_renderer_text_new() GtkCellRendererText provides a number of additional properties that dictate how each cell will be rendered You should always set the text property, which is the string that will be displayed in the cell The rest of the properties are similar to those used with text tags GtkCellRendererText contains a large number of properties that dictate how every row will be rendered g_object_set() was used in the following example to set the foreground color of every piece of text in the renderer to orange.

Listing 11.12 uses the jQuery JavaScript library to craft a special POST request for our JSON data B. When the results are returned, the function C populates the select list with them.

Some properties have a corresponding set property as well, which must be set to TRUE if you want the value to be used For example, you should set foreground-set to TRUE for the changes will take effect g_object_set (G_OBJECT (renderer), "foreground", "Orange", "foreground-set", TRUE, NULL); After you create a cell renderer, it needs to be added to a GtkTreeViewColumn Tree view columns can be created with gtk_tree_view_column_new_with_attributes() if you only want the column to display one cell renderer In the following code, a tree view column is created with the title Buy and a renderer with one attribute This attribute will be referred to as BUY_IT when the GtkListStore is populated column = gtk_tree_view_column_new_with_attributes ("Buy", renderer, "text", BUY_IT, NULL); The preceding function accepts a string to display in the column header, a cell renderer, and a NULL-terminated list of attributes.

2. For clarity, we have not shown other parameters that may need to be specified, such as the name of the person who ordered the pizza or the address to which it should be delivered.

Cross-site request forgery (XSRF)

Each attribute contains a string that refers to the renderer property and the tree view column number The important thing to realize is that the column number provided to gtk_tree_view_column_new_with_attributes() refers to the tree model column, which may not be the same as the number of tree model columns or cell renderers used by the tree view..

The problem with this approach isn t technical this works and it prevents JSON hijacking. But it s a workaround that s sometimes unnecessary and can interfere with systems developed using the REST architectural style. If this approach causes problems, we have additional options. First, we can explicitly enable JSON requests from GETs with the code shown in listing 11.13.

Wget can also submit POST parameters as follows: wget --post-data 'price=0.01&pay=yes' https://www.deliver-me-pizza.com/submit_order Note that the attacker does not have to traverse through the order or confirmation web pages to issue the HTTP request to purchase the pizzas. The big problem here is that there is no reason that the web server should trust any of its clients. By sending the transaction state back to the client in response to the order and confirmation forms, it gives the client the ability to tamper with that state. There are a variety of possible solutions to this problem we will discuss two of them. The first solution involves keeping an authoritative copy of the session state in a database at the server. The second solution involves sending the authoritative state back to the client, but with a signature that will alert the server to any potential tampering with the state.

A target list for the buffer that is used to store information about copying from clipboards and other drag-anddrop sources. The current position of the cursor within the buffer. You can monitor this property with the notify signal to know when the cursor is moved. If set to TRUE, the text buffer currently has selected text. A target list for the buffer that is used to store information about pasting to clipboards and drag-and-drop destinations. A text tag table that holds all text tags that are used by the text buffer. The text currently contained by the text buffer excluding embedded images and child widgets.

[HttpGet] public JsonResult GetInsecureJson() { object data = GetData(); return Json(data, JsonRequestBehavior.AllowGet); }