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Printing completed, and you can now view the result. You should use gtk_print_ operation_get_error() to check the error message if the result was GTK_PRINT_ OPERATION_RESULT_ERROR. Each page must be converted into a Cairo context. You can use this callback to render a page manually. All of the pages were rendered. This signal is emitted after begin-print but before page rendering begins. It will continue to be emitted until FALSE is returned or until it is not handled. This allows you to split the document into pages in steps so that the user interface is not noticeably blocked. The user requested a preview of the document from the main printing dialog. This signal allows you to create your own preview dialog. If this signal is not handled, the default handler will be used. The callback function returns TRUE if you are handling the print preview. This signal is emitted for every page, which gives you one last chance to edit the setup of a page before it is printed. Any changes will be applied to only the current page! The status of the print operation changed. Possible values are defined by the GtkPrintStatus enumeration, and the current value can be retrieved with gtk_print_operation_get_ status().

if (_exit) _exit->Invoke(sender, args); } } // function calls to raise the events from outside the class void RaiseStartEvent() { Start(this, gcnew EventArgs()); } void RaiseExitEvent() { Exit(this, gcnew EventArgs()); } // event handler for Start event void OnStart(Object^ sender, EventArgs^ args) { Console::WriteLine("Starting"); } // event handler for Exit event void OnExit(Object^ sender, EventArgs^ args) { Console::WriteLine("Exiting"); } };

The states of two radio buttons in a group were changed. This signal is emitted on every member of a radio group when the selection is changed.

void f(Events^ e) { // Raise event for starting this function. e->RaiseStartEvent(); Console::WriteLine("Doing something."); // Raise event for exiting this function. e->RaiseExitEvent(); } int main() {

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not properly implemented, will make an implementation difficult. If the intent of the pattern is followed properly, then the micro-kernel is efficient, easy to maintain, and easy to extend. In the upcoming sections, we ll take a closer look at the architecture for this pattern, followed by hiding and designing the micro-kernel, and implementing this pattern. Finally, I ll demonstrate how it all works in a simple banking application.

The bounds of a GtkRange were altered by some type of user action. The current value of the range was changed. You can prevent the range from being updated by returning TRUE, but you will have to manually round the displayed value to the desired number of decimal places. The user pressed a keyboard key such as Page Up, Page Down, Home, End, or an arrow key that caused the slider to move. The range value was changed. This can be caused by user action or a call within your code.

A scale is about to be displayed, but GTK+ first gives you an opportunity to customize how it is displayed. The callback function returns a customized string displaying the value created by you.

Events^ events = gcnew Events();

The rules of the micro-kernel are fairly simple and can best be expressed using Figure 4-10.

The user moved focus from the scrolled window by pressing Ctrl+Tab or Ctrl+Shift+Tab. The given direction is always either GTK_DIR_TAB_FORWARD or GTK_DIR_TAB_BACKWARD. The child widget was scrolled in one direction. This could be caused by the mouse or one of the following default key bindings: Ctrl+Left, Ctrl+Right, Ctrl+Up, Ctrl+Down, Ctrl+Page Up, Ctrl+Page Down, Page Up, Page Down, Ctrl +Home, Ctrl+End, Home, or End.

// Add the event handlers for Start and Exit. events->Start += gcnew EventHandler(events, &Events::OnStart); events->Exit += gcnew EventHandler(events, &Events::OnExit); f(events); // Remove the event handlers. events->Start -= gcnew EventHandler(events, &Events::OnStart); events->Exit -= gcnew EventHandler(events, &Events::OnExit); } The output of Listing 7-17 is as follows: Adding Start event handler. Adding Exit event handler. Firing Start event. Starting Doing something. Firing Exit event. Exiting Removing Start event handler. Removing Exit event handler. The lock object will release its lock when it goes out of scope at the end of the method in which it is used. We have used the EventHandler and EventArgs classes provided by the framework, although in fact any delegate may be used as the event type instead with this pattern. Listing 7-18 is an example of using a delegate unrelated to the System::EventHandler class. You can see that much of the earlier example applies, but the parameters to the event are determined by parameters of the delegate type, EventProcessor. Differences are indicated in boldface. Listing 7-18. Using a Delegate Unrelated to System::EventHandler // events_custom2.cpp #include <msclr\lock.h> using namespace System; using namespace msclr; delegate void EventProcessor(String^ eventString); ref class Events { public:

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