Programming the Be Operating System-Chapter 9: Messages and Threads
Programming the Be Operating System-Chapter 9: Messages and Threads
... looper and a handler). Throughout this chapter you’ll see sev-eral examples of the creating of messages and the dispatching of these messages both by the object that created them and by other ... message and the target of the message don’thave to be one and the same, they can be as shown in this snippet (read the Application-Defined Messages 357identical to the version used in the Chapter ... routine has a case label that matches the message’s what data member, the handler acts on the message. Since the above code names a window as both the looper and the target handler, the window must...
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Tài liệu Programming the Be Operating System-Chapter 4: Windows, Views, and Messages doc
... altered—as they arehere with the writing of the string “Quitting ” the view needs to be updatedbefore the changes become visible onscreen. If the changes are made while the view’s window is hidden, then ... chapter. The beep() global function plays the system beep. Sound (and thus the beep() function) is a topic covered in the Media Kit chapter of the Be Book.View HierarchyA window can hold any number ... is used instead, the result is the same the win-dow’s corner ends up 100 pixels from the left and 50 pixels from the top of the screen. The above scenario begs the question: if the coordinates...
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Tài liệu Programming the Be Operating System-Chapter 6: Controls and Messages ppt
... *buttonBeep1Name = "Beep1";const char *buttonBeep2Name = "Beep2";const char *buttonBeep1Label = "Beep One";const char *buttonBeep2Label = "Beep Two";In the ... immediately change the setting. Instead,when the user dismisses the window the checkbox resides in, the value of the checkbox can be queried and the setting of the program feature could be per-formed ... from the BHandler class, so a win-dow is also a handler—an object that can handle messages that are dispatchedfrom a message loop. A window can both receive messages and handle them.For the...
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Programming the Be Operating System-Chapter 10: Files
... the upcoming file saving and opening changes. While looking over the old code, I’ll insert a few changeshere and there to ready the program for the file-handling code. The changes beginin the ... MyDrawViewunder the menubar, there’s no need to resize the frame such that itfills the window, less the menubar area. The MyHelloWindow constructor next establishes the size of the text view and the text ... whether the file is to have read and/ or write permission and whether a new file is to be created if one doesn’t already exist in the speci-fied directory. After creating the new file, invoke the...
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Tài liệu Programming the Be Operating System-Chapter 1: BeOS Programming Overview ppt
... dis-patches messages, and a BHandler object receives and handles these dispatched messages. Because the BLooper class is derived from the BHandler class, aBLooper object can dispatch and receive and handle ... dispatches messages and can receivethese messages itself for handling. Because the BApplication class and the BWindow class are derived from the BLooper class, such is the case for the appli-cation ... version would be executed and the window would close—but the 1Chapter 1In this chapter:• Features of the BeOS• Structure of the BeOS• Software Kits and Their Classes• BeOS Programming Fundamentals•...
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Tài liệu Programming the Be Operating System-Chapter 2: BeIDE Projects docx
... will be beneficial as you look at existing BeIDE example projects and as you then start towrite your own BeOS program. The BeIDE FoldersWhen the BeIDE is installed on your hard drive, the folders ... name, enter the name to change in the Find box, enter the new name in the Replace box, and click the Replace All button. The BeIDE willsearch all the project files for the name to find and replace ... of the projectyou’re working on.4. Open the newly renamed project and drag the renamed source code files and resource file from the folder and drop them into the project window.5. Remove the...
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Tài liệu Programming the Be Operating System-Chapter 3: BeOS API Overview doc
... value comesfrom a Be- defined constant. In such cases the Be- defined constants will be listed and described in the Constructor and Destructor section. For example, the third of the BWindow constructor’s ... explicitly call the object’s destructor when being destroyed. That’s because the BeOS does the work. The Constructor and Destructor section lets you knowwhen this is the case for a class. The BWindow ... important member functions. The focus of this book is on the first three kits described below: the ApplicationKit, the Interface Kit, and the Storage Kit. Don’t feel as if you’re being short-changed,...
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Tài liệu Programming the Be Operating System-Chapter 5: Drawing ppt
... 10.0); The call to MovePenTo() moves the pen to the location 30 pixels from the left of the view and 40 pixels from the top of the view. That places the pen at the point(30.0, 40.0). The call ... of the pixels in the rectangle are purple. Instead, each iseither red or blue. Because the pixels alternate between these two colors, and because pixel density is high on a typical monitor, the ... different is the content of the Draw() function. The code that demonstrates the concepts of each drawing topic can usually be added to the Draw() routine.In Be programming, the colors and patterns...
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Tài liệu Programming the Be Operating System-Chapter 7: Menus docx
... todetermine the item’s current label before changing it to a new string. The type oflabel-changing shown in the above snippet is a good candidate for the use of bothLabel() and SetLabel(). If the user ... the menubar and add it to the win-dow, create the menu and add it to the menubar, and create the menu item and add it to the menu. The menu-related code is identical to that used in the previ-ous ... BUTTON_BEEP_MSG: beep(); break; case MENU_BEEP_1_MSG: beep(); break; default: BWindow::MessageReceived(message); }}Because a click on the Beep One button and a selection of the Beep Once...
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Tài liệu Programming the Be Operating System-Chapter 8: Text ppt
... recognizes and reacts to is the standard message. A standard mes-sage is known to the system, and may be issued by the system, but it doesn’t havea hook function. Among the many standard messages the ... typed into the text view object will have 20 pixels of white spacebetween the object’s left edge and the character and 20 pixels of white spacebetween the object’s top edge and the top of the character. ... simply to make the relationshipbetween the two rectangles clear.Another point to be aware of is that the top and bottom coordinates of the textarea rectangle become unimportant as the user enters...
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