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In Figure 8-3, there are two tree model columns with the types G_TYPE_STRING and GDK_TYPE_COLOR. These are applied to GtkCellRendererText s text and foreground properties and used to render the tree view column accordingly. An additional way to change cell renderer properties is by defining a cell data function. This function will be called for every row in the tree view before it is rendered. This allows you to customize how every cell is rendered without the need for the data to be stored in a tree model. For example, a cell data function can be used to define how many decimal places of a floating point number to display. Cell data functions will be covered in detail in the Cell Data Functions section of this chapter. Later on, this chapter also covers cell renderers that are used to display text (strings, numbers, and Boolean values), toggle buttons, spin buttons, progress bars, pixbufs, combo boxes, and keyboard accelerators. In addition, you can create custom cell renderer types, but this is usually not needed, since GTK+ now provides such a wide variety of types. This section has taught you what objects are needed to use the GtkTreeView widget, what they do, and how they interrelate. Now that you have a basic understanding of the GtkTreeView widget, the next section will give a simple example using the GtkListStore tree model.

Using interfaces, the code in Listing 2-8 shows an implementation of RadioactiveAtom that implements the IRadioactive interface. Note the absence of the public keyword in the base class and interface list. Inheritance is always public in C++/CLI, so there is no need for the public keyword. Listing 2-8. Defining and Implementing an Interface // atom_interfaces.cpp interface class IRadioactive { void AlphaDecay(); void BetaDecay(); double GetHalfLife(); }; ref class RadioactiveAtom : Atom, IRadioactive { double half_life; void UpdateHalfLife() { // ... }

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Recall from the previous section that GtkTreeModel is simply an interface implemented by data stores such as GtkListStore. GtkListStore is used to create lists of data that have no hierarchical relationship among rows. In this section, a simple Grocery List application will be implemented that contains three columns, all of which use GtkCellRendererText. A screenshot of this application can be viewed in Figure 8-4. The first column is a gboolean value displaying TRUE or FALSE that defines whether or not the product should be purchased.

When implementing the abstraction, another abstraction is created, and when creating that abstraction, yet another abstraction is created To make all these abstractions work together, the developer has to assign the correct classes with one another The problem is that what seems obvious to one person isn t obvious to another person Hence, the advantage of the abstraction is lost In contrast, when writing a class that implements an interface and references another class, you know what the intention is For example, what happens when a generic type uses a generic type, which in turn uses a generic type Unless the developer has an intimate understanding of Generics, conceptual problems will arise My point is neither to scare nor to be a naysayer of Generics.

Tip You usually do not want to display Boolean values as text, because if you have many Boolean columns, it will become unmanageable for the user. Instead, you will want to use toggle buttons. You will learn how to do this with GtkCellRendererToggle in a later section. Boolean values are often also used as column attributes in order to define cell renderer properties.

public: // The atom releases an alpha particle // so it loses two protons and two neutrons. virtual void AlphaDecay() { SetAtomicNumber(GetAtomicNumber() - 2); SetIsotopeNumber(GetIsotopeNumber() - 4); UpdateHalfLife(); } // The atom releases an electron. // A neutron changes into a proton. virtual void BetaDecay() { SetAtomicNumber(GetAtomicNumber() + 1); UpdateHalfLife(); } virtual double GetHalfLife() { return half_life; } };

The second column displays the quantity of the product to buy as an integer and the third a text string describing the product. All of the columns use GtkCellRendererText for rendering; GtkCellRendererText is a cell renderer capable of displaying Boolean values and various number formats (int, double, and float) as text strings.

Rather, I say to use Generics, as they solve many problems elegantly, but realize that Generics are a powerful mechanism that should be treated with respect and used in proper doses..

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