By Wilf R. Lalonde, John R. Pugh
A quantity advisor to object-oriented programming that offers the smalltalk approach as a robust and effective prototyping and improvement surroundings. quantity describes the Smalltalk periods that offer the ordinary overlapping home windows, pop-up menus, and mouse interplay facility that characterizes the Smalltalk person interface. It additionally covers the model-view controller framework for the development of consumer interfaces. It gains the version view-controller paradigm for window-based purposes, and information person sessions, together with relationships among comparable periods and layout rationales. The e-book is written for use in parallel with the Smalltalk procedure.
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Extra resources for Inside Smalltalk Vol 2
Each light is made a dependent of the other nine. The user types a character between 0 and 9, which causes the associated light to turn on. The dependency mechanism takes care of turning off all other lights. 12 A snapshot of coordinated lights. More specifically, the example method sends a turnOn message. The update: method sends a turnOff message. In each case, the corresponding action reverses the icon bits and redisplays the icon at its old position. Both the turnOn and turnOff methods send changed messages that result in update: messages to dependents.
The protocol "changeRequest (sponsor) => updateRequest (dependent)" is used, for example, by the browser. Whenever an entry is selected in a subwindow or an operation such as closing the window is initiated, a changeRequest message is sent to the browser view. When the code view (a dependent subview) gets an updateRequest message, it immediately grants the request if no modifications have been made to the code; otherwise, it explicitly prompts the user and asks whether the modifications should be discarded.
5 PROCESS MANAGEMENT The process manager, an instance of class ProcessScheduler kept in global variable Processor, is responsible for coordinating the activation and deactivation of processes. There are processes for monitoring keyboard and mouse events (they simply queue information for later use by controllers), for determining if space is low, for monitoring the system clock, and for controlling a window. , between a window and the processes concerned with monitoring the keyboard and the mouse.
Inside Smalltalk Vol 2 by Wilf R. Lalonde, John R. Pugh