Tài liệu Programming the Be Operating System-Chapter 5: Drawing ppt

... be 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 ... the pen size The best process to use when altering the pen size is to obtain and save the cur- rent pen size, change it, perform the desired drawing using the new p...

Ngày tải lên: 26/01/2014, 07:20

... will be rectified in the balance of this book. Starting, in fact, with the next chapter. BeOS Programming Environment The programming tool you’ll be using to create your Be applications is the BeIDE. This ... during the execution of a program. An object can be added or deleted from the heap without regard for its placement in the heap, or for the other contents of...

Ngày tải lên: 26/01/2014, 07:20

... determined by the status of the Argv Only checkbox. While these two items appear grouped together in the Application Flags area, they aren’t related. Neither, either, or both can be checked at the same ... HelloApplication(); }; The source code file with the name of the project should hold the code for the implementation of the member functions of the application class...

Ngày tải lên: 26/01/2014, 07:20

... data members in Be classes. If a Be class does define data members, they are usually defined to be private rather than public. These private data members will be used within class member functions, ... version of the MyHelloWorld project the version just described. The Alert folder also holds a version of the MyHelloWorld project. The only difference between the two project...

Ngày tải lên: 26/01/2014, 07:20

... altered—as they are here with the writing of the string “Quitting ” the view needs to be updated before the changes become visible onscreen. If the changes are made while the view’s window is hidden, then ... AddChild(fMyView); BFont theFont = be_ plain_font; int32 theSize = 12; SetHelloViewFont(theFont, theSize); Show(); } The call to SetHelloViewFont() results in the a...

Ngày tải lên: 26/01/2014, 07:20

... *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 progra...

Ngày tải lên: 26/01/2014, 07:20

... to determine the item’s current label before changing it to a new string. The type of label-changing shown in the above snippet is a good candidate for the use of both Label() and SetLabel(). If the user ... 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 selec...

Ngày tải lên: 26/01/2014, 07:20

... that the first parameter to the BMenuItem constructor, label, specifies the new menu item’s label the text the user sees in the menu. The second parameter, message, associates a message with the ... by which the view can be identified at any time. The resizingMode parameter specifies the behavior of the view in response to a change in the size of the string view’s...

Ngày tải lên: 26/01/2014, 07:20

... message and the target of the message don’t have to be one and the same, they can be as shown in this snippet (read the Application-Defined Messages 357 identical to the version used in the Chapter ... calls the BLooper function DispatchMessage() for the next message in the queue. When your posted message becomes the next in the queue, the looper invokes DispatchMes...

Ngày tải lên: 17/10/2013, 19:15

... node (data). The entry can be represented by an entry_ref or a BEntry object. Currently the entry is in the form of an entry_ref. Here the entry is stored in a BEntry object. The BEntry function ... /boot/myDir/). The BEntry func- tion GetPath() is used to store the BEntry information as a BPath object. Here the BPath object path is first set to the directory, then the f...

Ngày tải lên: 20/10/2013, 10:15