Tree and List Widget Overview — Overview of GtkTreeModel, GtkTreeView, and friends of a list store. Creating a tree store operates almost exactly the same. A ew and its associated widgets are an extremely powerful way of displaying data. They are used in conjunction with a ore or Gtk. TreeStore. In this part of the GTK+ tutorial, we cover the GtkTreeView widget. Three examples demonstrate the functionality of the widget.
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GTK+ By Example/Tree View
For example, a model mapping the file system could be created for a file manager. Adding data to the model is done using Gtk. The string form is a list of numbers separated by a colon. The steps to create a tree view are very similar to creating a list view.
We append a new row and set a value to the row, which is referenced by an GtkTreeIter object. The model is created, data is stored in it, a tree view is created and columns are added to it. It needs a GtkTreeModel to know where to retrieve its data from.
TreeView is not a difficult matter. This means that the data is separated from the view.
Columns and cell renderers Once the GtkTreeView widget has a model, it will need to know how to display the model. ListStore contains simple rows of data, and each row has no children, whereas Gtk. It is used to add a row to a GtkTreeStore as a child of an existing row. Typically the 2 is never passed directly like that; usually an enum is created wherein the different columns are enumerated, followed by a token that represents the total number of columns. This is always done because this is a variable-argument function and it needs to know when to stop processing arguments.
In the example, we have three buttons and one text entry. Hosted by Red Hat. First we need a simple Gtk. Thanks to Lars Wirzenius for the original version of this gtkhreeview written for PyGtk.
This function gets two rows and has to return a negative integer if the first one should come before the second one, zero if they are equal and a positive integer if the second one should come before the gtktrweview one. You can create a new instance of a Gtk.
It needs a Gtk. TreeModel with the list-like method mentioned above, it is also possible to either use Gtk.
Each number refers to the offset at that level. It is relatively easy gtktreevview write a custom renderer. TreeView constructor, or by calling Gtk.
In the example above the sorted list looked like: The example application in this article lets the user manage a folder tree. First of all a comparison function is needed. In our code example, we show five items in the GtkTreeView. This code checks if there is some item left in the list.
This means that the new row will only be visible when its parent is visible and in its expanded state. Most applications will need to not only deal with displaying data, but also receiving input events from users. Read the Docs v: You can retrieve a Gtk.
TreeStore contains rows of data, and each row may have child rows. In the example, we divide programming languages into two groups: Then the sort function has to be set by Gtk. This creates a list store with two columns: Creating the model is quite simple:. Although you can theoretically implement your own Model, you will normally use either the Gtk. A column of a Gtk.
Notice that the last argument is In addition, it is relatively easy to write a custom renderer yourself.