THE TREE VIEW WIDGET in Font

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CHAPTER 8 THE TREE VIEW WIDGET
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The accel-mods value allows you to detect keys that usually do not cause any immediate action from an application by themselves. These values are defined by the GdkModifierType enumeration, although not all values can occur when dealing with keyboard accelerators. A list of important values follows: GDK_SHIFT_MASK: The Shift key. GDK_CONTROL_MASK: The Ctrl key. GDK_MOD_MASK, GDK_MOD2_MASK, GDK_MOD3_MASK, GDK_MOD4_MASK, GDK_MOD5_MASK: The first modifier usually represents the Alt key, but these are interpreted based on your X server mapping of the keys. They can also correspond to the Meta, Super, or Hyper key. GDK_SUPER_MASK: Introduced in 2.10, this allows you to explicitly state the Super modifier. This modifier may not be available on all systems! GDK_HYPER_MASK: Introduced in 2.10, this allows you to explicitly state the Hyper modifier. This modifier may not be available on all systems! GDK_META_MODIFIER: Introduced in 2.10, this allows you to explicitly state the Meta modifier. This modifier may not be available on all systems! In most cases, you will want to set the modifier mask (acel-mods) and the accelerator key value (accel-key) as two attributes of the tree view column using GtkCellRendererAccel. In this case, the modifier mask will be of they type G_TYPE_INT, and the accelerator key value G_TYPE_UINT. Because of this, you will want to make sure to case the GdkModifierType value to a gint when setting the content of the modifier mask column. store = gtk_list_store_new (COLUMNS, G_TYPE_STRING, G_TYPE_INT, G_TYPE_UINT); GtkCellRendererAccel provides two signals. The first, accel-cleared, allows you to reset the accelerator when the user removes the current value. In most cases, you will not need to do this unless you have a default value that you want the accelerator to revert to. Of greater importance, accel-edited allows you to apply changes that the user makes to the keyboard accelerator, as long as you set the editable property to TRUE. The callback function receives a path string to the row in question along with the accelerator key code, mask and hardware key code. In the callback function, you can apply the changes with gtk_list_store_set(), as you would with any other editable type of cell.
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In Exercise 8-1, you will have the opportunity to practice using the GtkTreeView widget, along with multiple types of cell renderers. This is an extremely important exercise for you to try, because you will need to use the GtkTreeView widget in many applications. As always, when you are finished, you can find one possible solution in Appendix F.
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CHAPTER 8 THE TREE VIEW WIDGET
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Exercise 8-1. File Browser
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By now, you have probably had enough of Grocery List applications, so let us try something different. In this exercise, create a file browser using the GtkTreeView widget. You should use GtkListStore for the file browser and allow the user to browse throughout the file system. The file browser should show images to differentiate among directories and files. Images can be found in the downloadable source code at www.gtkbook.com. You can also use the GLib directory utility functions to retrieve directory content. Double-clicking a directory should move to that location.
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In this chapter, you learned how to use the GtkTreeView widget. This widget allows you to display lists and tree structures of data with GtkListStore and GtkTreeStore respectively. You also learned the relationship among the tree view, tree model, columns, and cell renderers and how to use each of the objects. Next, you learned about the types of objects that can be used to refer to a row within the tree view. These include tree iterators, paths, and row references. Each of these objects has its own advantages and disadvantages. Tree iterators can be used directly with models, but they become invalid when the tree model changes. Tree paths are easily understandable, because they have associated human-readable strings, but may not point to the same row if the tree model is changed. Lastly, tree row references are useful, because they remain valid for as long as the row exists, even when the model is changed. You next learned how to handle selections of one row or multiple rows. With multiple row selections, you can use a for-each function, or you can get a GList list of the selected rows. A useful signal when dealing with selections is GtkTreeView s row-activated signal, which allows you to handle double-clicks. After that, you learned how to create editable cells with GtkCellRendererText s edited signal, which displays a GtkEntry to allow the user to edit the content in the cell. Cell data functions can also be connected to columns. These cell data functions allow you to customize each cell before it is rendered to the screen. Lastly, you learned about a number of cell renderers that allow you to display toggle buttons, pixbufs, spin buttons, combo boxes, progress bars, and keyboard accelerator strings. You were also introduced to the GtkComboBox widget. Congratulations! You are now familiar with one of the hardest and most versatile widgets provided by GTK+. In the next chapter, you will learn how to create menus, toolbars, and pop-up menus. You will also learn how to automate menu creation with user interface (UI) files.
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