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The following exercise instructs you to create a text editing application with basic functionality. It will give you practice on interacting with a GtkTextView widget.
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Exercise 7-1. Text Editor
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Use the GtkTextView widget to create a simple text editor. You should provide the ability to perform multiple text editing functions, including creating a new document, opening a file, saving a file, searching the document, cutting text, copying text, and pasting text. When creating a new document, you should make sure the user actually wants to continue, because all changes will be lost. When the Save button is pressed, it should always ask where to save the file. Once you have finished this exercise, one possible solution is shown in Appendix F. Hint: This is a much larger GTK+ application than any that has previously been created in this book, so you may want to take a few minutes to plan out your solution on paper before diving right into the code. Then, implement one function at a time, making sure it works before continuing on to the next feature. We will expand on this exercise in later chapters as well, so keep your solution handy!
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This is the first instance of the Text Editor application that you will be creating throughout this book. In the last few chapters of this book, you will learn new elements that will help you create a fully featured text editor. The application will first be expanded in 9; you will add a menu and toolbar. In 12, you will add printing support and the ability to remember past open files and searches. You can view one possible solution to Exercise 7-1 in Appendix F. Much of the functionality of the text editor solution has been implemented by other examples in this chapter. Therefore, most of the solution should look familiar to you. The solution is also a bare minimum solution, and I encourage you to expand on the basic requirements of the exercise for more practice.
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CHAPTER 7 THE TEXT VIEW WIDGET
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In this chapter, you learned all about the GtkTextView widget, which allows you to display multiple lines of text. Text views are usually contained by a special type of GtkBin container called GtkScrolledWindow that gives scrollbars to the child widget to implement scrolling abilities. A GtkTextBuffer handles text within a view. Text buffers allow you to change many different properties of the whole or portions of the text using text tags. They also provide cut, copy, and paste functions. You can move throughout a text buffer by using GtkTextIter objects, but text iterators become invalid once the text buffer is changed. Text iterators can be used to search forward or backward throughout a document. To keep a location over changes of a buffer, you need to use text marks. Text views are capable of displaying not only text but also images and child widgets. Child widgets are added at anchor points throughout a text buffer. The last section of the chapter briefly introduced the GtkSourceView widget, which extends the functionality of the GtkTextView widget. It can be used when you need features such as syntax highlighting and line numbering. In 8, you will be introduced to two new widgets: combo boxes and tree views. Combo boxes allow you to select one option from a drop-down list. Tree views allow you to select one or more options from a list usually contained by a scrolled window. GtkTreeView is the most difficult widget that will be covered in this book, so take your time with the next chapter.
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The Tree View Widget
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his chapter will show you how to use the GtkScrolledWindow widget in combination with another powerful widget known as GtkTreeView. The tree view widget can be used to display data in lists or trees that span one or many columns. For example, a GtkTreeView can be used to implement a file browser or display the build the output of an integrated development environment. GtkTreeView is an involved widget, because it provides a wide variety of features, so be sure to carefully read through each section of this chapter. However, once you learn this powerful widget, you will be able to apply it in many applications. This chapter will introduce you to a large number of features provided by GtkTreeView. The information presented in this chapter will enable you to mold the tree view widget to meet your needs. Specifically, in this chapter, you will learn the following: What objects are used to create a GtkTreeView and how its model-view-controller design makes it unique How to create lists and tree structures with the GtkTreeView widget When to use GtkTreePath, GtkTreeIter, or GtkTreeRowReference to reference rows within a GtkTreeView How to handle double-clicks, single row selections, and multiple row selections How to create editable tree view cells or customize individual cells with cell renderer functions The widgets you can embed within a cell, including toggle buttons, pixbufs, spin buttons, combo boxes, progress bars, and keyboard accelerator strings
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