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Setting or clearing ("unclicking") a checkbox changes the checkbox's state with no other side-effects.Violating this guideline by associating additional actions with the change of state frequently confuses users, because they are used to configuring data in entry controls such as text boxes, radio buttons, and checkboxes and then invoking an action control such as a push button to initiate the ...
Radio buttons always appear in pairs or larger groups, and only one option in the group can be selected at a time; selecting a new item from the group's buttons also de-selects the previously selected button. Check box – control which can be clicked upon to enable or disable an option. Also called a tick box.
The first version of Flutter was known as "Sky" and ran on the Android operating system. [30] It was unveiled at the 2015 Dart developer summit with the stated intent of being able to render consistently at 120 frames per second. [30] On December 4, 2018, Flutter 1.0 was released at the Flutter conference in London. [31]
In EAV systems representing classes with substructure, the validation metadata will also record what class, if any, a given attribute belongs to. Presentation metadata: how the attribute is to be displayed to the user (e.g., as a text box or image of specified dimensions, a pull-down list or a set of radio buttons). When a compound object is ...
Swing is a highly modular-based architecture, which allows for the "plugging" of various custom implementations of specified framework interfaces: Users can provide their own custom implementation(s) of these components to override the default implementations using Java's inheritance mechanism via LookAndFeel.
Class diagrams can also be used for data modeling. [2] The classes in a class diagram represent both the main elements, interactions in the application, and the classes to be programmed. In the diagram, classes are represented with boxes that contain three compartments: The top compartment contains the name of the class.
Ext JS version 2.0 was released on 4 December 2007. This version was promoted as providing an interface and features more similar to those traditionally associated with desktop applications. Also promoted were the new user documentation, API documentation, and samples.
In computer programming, specifically when using the imperative programming paradigm, an assertion is a predicate (a Boolean-valued function over the state space, usually expressed as a logical proposition using the variables of a program) connected to a point in the program, that always should evaluate to true at that point in code execution.