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Creating a control template One of the properties of a control is its template, which defines how it looks and behaves in general. We say in general because the template still takes some directing. For example, the template might say that the control has a rectangle as its background, but the color or fill of that rectangle might be overridden by any particular control. Because the template is a property, it can be set as part of a style. In fact, this is the most common way of defining a new control template. For example, we can modify the Button style to change all the buttons into ellipses (listing 6.9).

CAC is usually provided by Service Provider Provisioning systems, and so the Network Management systems should coordinate with Provisioning systems to ensure the delivery of stringent QoS

double fabs(double num) long double fabsl(long double num)

The prototype for fabs( ) is in <mathh> The fabs( ) function returns the absolute value of num fabsl( ) is the long double version of this function

<Style x:Key="CalcButton" TargetType="Button"> <Setter Property="Template"> Sets template <Setter.Value> property <ControlTemplate TargetType="Button"> <Ellipse Fill="LightGreen" /> Sets content </ControlTemplate> to ellipse </Setter.Value> </Setter> <Setter Property="Control.Margin" Value="10"/> </Style>

This program prints 10 10 on the screen:

A distributed control plane is required to support large Carrier Ethernet networks CoS awareness in Layer 1 transport devices in access networks is required to preclude any speed mismatches

#include <stdioh> #include <mathh> int main(void) {

All we re doing here is setting the Template property b via the style. In this case, we set the content to be a light green ellipse c. When the code is run, any controls that use this style replaces their control templates with the template here (figure 6.8). Depending on how late you were up last night, you may or may not notice a slight problem with the calculator. In fact, there are several problems. Aside from the obvious there s no longer text on the buttons the buttons no longer act like buttons. There are no visual clues when you move over the button or click the button. The buttons do still work, though you can click them and do calculations provided you have a good memory for where the various digits and operators are located.

printf("%11f %11f", fabs(10), fabs(-10)); return 0; }

abs( )

2

Figure 6.8 We ve replaced the Button style to use an ellipse. Unfortunately, we ve now lost the text from the buttons.

double floor(double num) long double floorl(long double num)

The prototype for floor( ) is in <mathh> The floor( ) function returns the largest integer (represented as a double) that is not greater than num For example, given 102, floor( ) returns 10 Given 102, floor( ) returns 20 floor( ) is the long double version of this function

Standards available but need to be implemented in commercial solutions (most of them support pre-standard versions) Require enhanced version of Link Aggregation that distributes Ethernet frames based on VLAN ID (not just on MAC/IP addresses; this forces service-related and associated OAM frames are pinned to same links through out the network)

ContentPresenters To make the text show up again, we need to tell the system where to put that content. Fortunately, this is pretty easy. There s a special framework element called a ContentPresenter. When you put a ContentPresenter into a control template, WPF shoves the control s content wherever the content presenter says. As always, there s a wrinkle. A template can only hold a single framework element. You can put an ellipse there, or

This fragment prints 10 on the screen:

printf("%f", floor(109));

fmod( )

a rectangle, or any one thing, but you can t put an ellipse and a rectangle or, most importantly for our purposes, an ellipse and a content presenter. This is the same issue you have when you re adding controls anywhere. Most places only support a single control, but that single control can be anything including a layout panel. And a layout panel can hold any number of children. For simplicity, let s use a Grid layout panel (because this is the default) without adding any rows or columns so that it behaves like a Canvas, but with more support for positioning. Here s the XAML for the ControlTemplate (the rest of the style definition is unchanged):