DEC Text Processing Utility Data Types

3.12 Unspecified Data Type

To give a variable the data type unspecified, assign the predefined constant TPU$K_UNSPECIFIED to the variable:

prog := TPU$K_UNSPECIFIED;

3.13 Widget Data Type

The DECwindows version of DECTPU provides the widget data type to support DECwindows widgets. The non-DECwindows version of DECTPU does not support this data type.

A widget is an interaction mechanism by which users give input to an application or receive messages from an application.

You can use the equal operator (=) or the not-equal operator (<>) on widgets to determine whether they are equal (that is, whether they are the same widget instance), but you cannot use any other relational or arithmetic operators on them.

Once you have created a widget instance, DECTPU does not delete the widget instance, even if there are no variables referencing it. To delete a widget, use the DELETE built-in procedure.

DECwindows DECTPU provides the same support for DECwindows gadgets that it provides for widgets. A gadget is a structure similar to a widget, but it is not associated with its own unique DECwindows window. Gadgets do not require as much memory to implement as widgets do. In most cases, you can use the same DECwindows DECTPU built-ins on gadgets that you use on widgets.

For more information on widgets or gadgets, see the OpenVMS overview documentation.

3.14 Window Data Type

A window is a portion of the screen that displays as much of the text in a buffer as will fit in the screen area. In EVE, the screen contains three windows by default: a large window for viewing the text in your editing buffer and two one-line windows for displaying commands and messages. In EVE or in a user-written interface, you can subdivide the screen to create more windows.

A variable of the window data type ‘‘contains’’ a window. The CREATE_WINDOW, CURRENT_WINDOW, and GET_INFO built-in procedures return a value of the window data type. CREATE_WINDOW is the only built-in procedure that creates a new window. The following example assigns a value of the window data type to the variable x:

x := CREATE_WINDOW (1, 12, OFF);

The first parameter specifies that the window starts at screen line number 1. The second parameter specifies that the window is 12 lines in length. The OFF keyword specifies that a status line is not to be displayed when the window is mapped to the screen.

3–22DEC Text Processing Utility Data Types

Page 61 Page 63
Page 62
Image 62
Compaq AA-PWCBD-TE manual Widget Data Type, Window Data Type, DEC Text Processing Utility Data Types Unspecified Data Type
Page 61 Page 63

AA-PWCBD-TE specifications

The Compaq AA-PWCBD-TE is a highly regarded laptop battery designed to provide reliable power to a range of Compaq laptop models. As technology continues to evolve, the necessity for efficient and long-lasting batteries becomes increasingly important, especially for students, professionals, and anyone reliant on portable computing.

One of the standout features of the AA-PWCBD-TE is its impressive capacity, designed to enhance the performance of your device. With a power capacity of around 5200 mAh, this battery is engineered to provide extended usage times, allowing users to work on the go without frequent interruptions for recharging. The battery supports efficient energy management, contributing to the overall longevity of the device.

Additionally, the AA-PWCBD-TE integrates advanced lithium-ion technology, which is favored for its reliability and minimal memory effect. Lithium-ion batteries typically offer a higher energy density compared to older technologies, meaning they can store more energy in a smaller size. This technology also supports faster charging times, making it a convenient solution for busy users.

Safety is another vital characteristic of the AA-PWCBD-TE. It features built-in protection against overcharging, overheating, and short-circuit conditions, which helps ensure the safety of both the battery and the device itself. This level of protection is crucial, especially in professional environments where equipment failure can lead to productivity losses.

Compatibility is also a key aspect of the AA-PWCBD-TE, as it is designed to fit a variety of Compaq laptop models. Users can easily determine whether this battery is suitable for their specific model, simplifying the buying process and ensuring optimal performance.

In terms of weight and dimensions, the AA-PWCBD-TE is designed to be lightweight and compact, adding minimal bulk to the laptop while still delivering powerful performance. Users can enjoy the balance of efficiency and portability, making it an ideal choice for those who travel frequently or require a battery that doesn't compromise on power.

Overall, the Compaq AA-PWCBD-TE stands out as a dependable and efficient laptop battery that enhances the user experience. With its impressive capacity, cutting-edge technology, and safety features, it is a valuable accessory for anyone looking to improve their mobile computing capabilities.
Top Page Image Contents