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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The View is composed of the first three objects, while the last is the Model.
One of the prime benefits of the MVC design is that multiple views can be created of a single model. For example, a model mapping the file system could be created for a file manager. Many views could be created to display various parts of the file system, but only one copy need be kept in memory. The gtktreevew of the cell renderers is to provide extensibility to the widget and to allow multiple ways of rendering the same type of data. For example, consider how to render a boolean variable.
Should it render it as a string of “True” or “False”, “On” or “Off”, or should it be rendered as a checkbox?
GTK+ By Example/Tree View
It is possible to develop a new type of model, but the existing models should be satisfactory for all but the most specialized of situations. Creating the model is quite simple:. This creates a list store with two columns: 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.
The next example will illustrate this, only using a tree store instead of a list store.
Creating a tree store operates almost exactly the same. To do this, a GtkTreeIter must be acquired. The iterator points to the location where data will be added.
Consider the following example:. Notice that the last argument is This is always done vtktreeview this is a variable-argument function and it needs to know when to stop processing arguments.
It can be used to set the data in any or all columns in a given row. It is used to add a row to a GtkTreeStore as a child of an existing row. This means that the new row will only be visible when its parent is visible and in its expanded state.
While there are several different models to choose from, there is tutoiral one view widget to deal with. It works with either the list or the tree store.
Setting up a GtkTreeView is not a difficult matter. It needs a Tutotial to know where to retrieve its data from. Once the GtkTreeView widget has a model, it will need to know how to display the model. It does this with columns and cell renderers. Cell renderers are used to draw the data in the tree model in a gtktreevoew.
It is relatively easy to write a custom renderer. It needs to know the name of the column to label for the user, what type of cell renderer to use, and which piece of data to retrieve from the model for a given row. At this point, all the steps in creating a displayable tree have been covered. The model is created, data is stored gktreeview it, a tree view is created and columns are added to it.
Most applications will need to not only deal with displaying data, but also receiving input events from users. Here is a simple example of using a GtkTreeView widget in context of the other widgets. It simply creates yutorial simple model and view, and puts them together.
Note that the model is never populated with data — that is left as an exercise for the reader. More information can be found on this in the GtkTreeModel thtorial.
Tree and List Widgets — Python GTK+ 3 Tutorial documentation
Go to page content Go to main menu Go to the search field. About Users Administrators Developers. Creating the model is quite simple: Sorting and Searching”- 1.
Creating the view component While there are several different models to choose from, there is only one view widget to deal with. Columns and cell renderers Once the GtkTreeView widget has a model, it will need to know how to display the model. Selection handling Most applications will need to not only deal with displaying data, but also receiving input events from users.
Simple Example Here is a simple example of tuyorial a GtkTreeView widget in context of the other widgets. This website is available in many languages Switch Language. Hosted by Red Hat.