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Stylizer switch block mode5/1/2023 Since each view is directly contained in just one other, this containment relationship defines a tree. Typical containers are windows, panels, and toolbars. Views are arranged into a hierarchy of containment, in which some views contain other views. In Java Swing, they’re JComponents in HTML, they’re elements or nodes in other toolkits, they may be called widgets, controls, or interactors. The view concept goes by a variety of names in various UI toolkits. A view is an object that covers a certain area of the screen, generally a rectangular area called its bounding box. The first important pattern we’ll talk about today is the view tree. So we won’t be talking about things like SQL, PHP, Ruby on Rails, or evenĪ view is an object that displays itself on a region of the screen Also note that the backend development of web applications falls outside the scope of the course material in this class. We won’t get into the details of HTML,ĬSS, Javascript, and JQuery here: they are well-covered in the labs we hosted earlier this semester (see course web site for materials). We’ll also look at the three main approaches to implementing GUIs. ![]() Three of the most important patterns are the model-view abstraction, which has evolved somewhat since its original formulation in the early 80’s the view tree, which is a central feature in the architecture of every important GUI toolkit and the listener pattern, which is essential to decoupling the model from the view. Today we’ll take a high-level look at the software architecture of GUI software, focusing on the design patterns that have proven most useful. Today’s reading is the first in a series of readings about how graphical user interfaces are implemented.
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