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and other technologies play tricks to try to make things look the same when changing DPI. But it doesn t work all that well. It s not uncommon for applications to wrap text strangely or have oddly sized text when running at an alternative DPI (figure 1.4). These approaches don t take advantage of the better equipment; instead of having a sharper UI, the UI just gets smaller. If Microsoft s own applications don t handle DPI changes well, what chance do we have To date, the most common solution has been to request that users not use the fancy new modes of their equipment not a popular workaround. WPF is built on top of Direct3D, which can take advantage of the features of current and new graphics cards as they come out. As you ll see, it also has a clean approach for the DPI problem. WPF uses device independent pixels (DIPs). There are always 96 pixels to an inch. If the DPI setting of the target device changes, everything is automatically scaled up or down. The main reason that 96 was used is that most current hardware uses 96 DPI. Also, it s easy to scale from 96ths of an inch to 72nds of an inch, which is what most fonts use.

29:

Figure 29-2

Using modern software design It s a little odd to describe object-oriented programming (OOP) as modern, given that it s been around since the 70s. It wasn t until much later that the concepts and technology caught up with the promise of the early days. Windows Forms is OO, and MFC is um MFC has things called classes. Both MFC and Windows Forms are wrappers on low-level technology, and the underlying mechanisms have a lot of influence on the higher-level design. Also, the non-OO stuff underneath peeks its head out rather more than is desirable. WPF was built OO from the ground up. The WPF API is also completely managed, and almost all of WPF itself is written with managed code. This is a major change for Windows. For the first time, there s no underlying C interface that you can call directly the managed code is the code. Some advantages to going managed are, as follows:

Service Frame Delivery An EVC allows Ethernet service frames to be exchanged between UNIs that are connected via the same EVC These may be data frames or control frames A service provider can indicate what types of frames are supported and those that are not, and also the type of support provided, using four service frame delivery attributes These are listed next

Figure 29-3

The Forms tab contains three forms that can be included in a project Table 29-2 lists these available forms

The road to Avalon (WPF)

Unicast Service Frame Delivery The unicast service frame is defined by the destination MAC address, which may be known (learnt by the network) or unknown For each UNI pair, this EVC service attribute specifies whether unicast service frames are to be discarded, delivered conditionally (and the specific conditions), or unconditionally Multicast Service Frame Delivery In this EVC service attribute, a range of destination MAC addresses are specified, and for each UNI pair, whether multicast service frames are to be discarded, delivered conditionally (and the specific conditions), or unconditionally Broadcast Frame Delivery The IEEE 8023 defines the broadcast address as a destination MAC address of all 1s For each UNI pair, this EVC service attribute specifies whether broadcast frames are to be discarded, delivered conditionally (and the specific conditions), or unconditionally, In general, all Ethernet services support unicast, multicast, and broadcast service frames Layer 2 Control Protocol Processing This service attribute can be applied at the UNI or per EVC There are many Layer 2 control protocols that can be employed (such as IEEE 8023x MAC control frames, IEEE 8021x Port Authentication, Spanning Tree

The Dialogs tab contains five items, which are summarized in Table 29-3

The Projects tab contains four types of projects These projects are summarized in Table 29-4