![]() the menu that pops up is appropriate to the mouse pointer position when the Menu button was pressed. Further, they can be context-sensitive, i.e. In a multi-tasking environment, pop-up menus are much more useable. ![]() This is an alternative to the menu bar approach, where an area of the screen is dedicated to providing a fixed set of menu headers. That is, they can be made to appear when the user clicks on the appropriate mouse button - the middle Menu button. Menus also form an important part of WIMP-based programs. In the first three cases, the Wimp can maintain the icon automatically, even to the point of performing text input without the application's intervention. An icon is a rectangular area in a window whose contents can be text, a sprite, both, or user-drawn graphics. This is especially true if a program takes advantage of icons. Very often, much of the work of keeping a window's contents up to date can be delegated to the Wimp. It merely has to respond appropriately to the messages it receives from the Wimp, in addition to performing its own processing (using the routines supplied to perform window operations). Thus, the task needs to make as few intelligent decisions as possible. ![]() The Wimp co-operates with the task in keeping the screen display correct by telling the task when something needs to be redrawn. The responsibility of drawing and maintaining these windows is shared between the application(s) and the Window Manager. These are used to implement a 'desktop' metaphor, where the windows represent documents on a desk. In this section, the words task, program and application should be treated as synonyms.Īn immediately recognisable feature of Wimp programs is their use of overlapping rectangular windows on the screen. Programs that run under the Wimp are often called tasks, because they are operating under a multi-tasking environment. The manager itself is usually referred to as the Wimp. The Window Manager is designed to simplify the task of producing programs to run under a WIMP (Windows, Icons, Menus and Pointer) environment. You will find it benefits both you and other programmers if you make all your applications run under the Window Manager (and in a consistent manner), since this will lead to a much richer RISC OS environment. This should make it easier for users to learn how to use your software, as they will already be familiar with the necessary techniques. This chapter also gives guidelines on how your applications should behave so that they are consistent with other RISC OS applications. it also provides the means for you to make your applications run in a multi-tasking environment, so they can interact with each other, and with other software.it provides a simple to use graphical interface, that makes your applications more accessible to a wider range of users.The Window Manager is an important part of RISC OS because: It provides the facilities you need to write applications that work in the Desktop windowing environment that RISC OS provides. This chapter describes the Window Manager. RISC OS PRMs: Volume 3: Chapter 53: The Window Manager
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