Which properties are set in the default descriptor file to create a new Flex application? Each correct answer represents a complete solution. Choose all that apply.
Answer(s): B,C,D
The properties required to be set in the default descriptor file when a user creates a new Flex application in a desktop project are as follows:Answer option A is incorrect. Window is not a valid property. It should be initialWindow.
Which properties are provided by the Flex sizing and layout mechanism to control the size of visual components? Each correct answer represents a complete solution. Choose all that apply.
Answer(s): A,C,D
The various ways to control the size of visual components provided by the Flex sizing and layout mechanisms are as follows:· Default sizing: It automatically determines the sizes of controls and containers. · Explicit sizing: It is used to set the height and width properties to pixel values. By using this, a user can set the component dimension to absolute sizes, and Flex does not override these values.· Percentage-based sizing: It is used to specify the component size as a percentage of its container size. By using this, a user can specify the percentHeight and percentWidth properties in MXML tags.· Constraint-based layout: It is used to control the size and position by anchoring components sides, centers, or baselines to locations in their container. A user can do it by specifying the top, bottom, left, right, baseline, horizontalCenter, and verticalCenter styles. Answer option B is incorrect. The Flex sizing and layout mechanism provides only four ways to control the size of visual components. Therefore, currentState sizing is not valid way to control the size of visual components.Canvas is a container in flex that defines a rectangular placeholder where its child components can be placed. It does not have the ability to lay its child components automatically. A user has to lay the child components by own. Canvas has the following default sizing characteristics:· Default size: It is the size large enough to hold all its children at the default sizes of the children.· Default padding: It is 0 pixels for the top, bottom, left, and right values. Answer option B is incorrect. The TabNavigator container is a child class of the ViewStack container having a collection of child containers, in which only one child can be visible at a time. It automatically creates a TabBar container at the top of the TabNavigator container along with a tab related to each child container. The TabNavigator container has the following characteristics:Answer option C is incorrect. ViewStack is a container that contains other child containers stacked on top of each other like a deck of cards. It consists of a collection of child containers stacked on top of each other, where only one child at a time is visible. When the user selects different child containers, the ViewStack container gives the impression of replacing the old one because a new child container appears in the same location. The sizing characteristics of the ViewStack container are follows:Answer option A is incorrect. VBox is a layout container that is used to arrange its children in a single vertical stack, or column. This container behaves like the application component when its layout is set to vertical. It has the following default sizing characteristics:· Default size: The height of a VBox layout container is large enough to hold all its children at the default. The width of a VBox layout container is the default or width of the widest child along with left and right padding of the container. · Default padding: It has 0 pixels for the top, bottom, left, and right values. Answer option A is incorrect. VBox is a layout container that is used to arrange its children in a single vertical stack, or column. This container behaves like the application component when its layout is set to vertical. It has the following default sizing characteristics:· Default size: The height of a VBox layout container is large enough to hold all its children at the default. The width of a VBox layout container is the default or width of the widest child along with left and right padding of the container. · Default padding: It has 0 pixels for the top, bottom, left, and right values.
Which of the following components is used to encapsulate data and behaviors related to the data processed by the application?
Answer(s): D
The model is the domain-specific representation of the data upon which the application operates. Domain logic adds meaning to raw data (for example, calculating whether today is the users birthday, or the totals, taxes, and shipping charges for shopping cart items). When a model changes its state, it notifies its associated views so they can refresh. Many applications use a persistent storage mechanism such as a database to store data. MVC does not specifically mention the data access layer because it is understood to be underneath or encapsulated by the model. Models are not data access objects; however, in very simple apps that have little domain logic there is no real distinction to be made. Also, the ActiveRecord is an accepted design pattern which merges domain logic and data access code - a model which knows how to persist itself.FactWhat is the Model-View-Controller (MVC) architecture? Model-View-Controller (MVC) is an architectural pattern that isolates business logic from input and presentation, permitting independent development, testing and maintenance of each. It increases the reusability of the components and improves the maintainability of the overall system. There are three components in MVC, which are as follows:· Model components: It encapsulates data and behaviors related to the data processed by the application.· View components: It defines the applications user interface, and the users view of application data.· Controller components: It handles data interconnectivity in the application and provides application management and the business logic of the application. Answer option C is incorrect. The pattern is not a valid component.
Which style sheet is created as a .swf file and can be loaded at application runtime?
The compiled style sheet is created as a .swf file and can be loaded at application runtime. Answer options A, C, and B are incorrect. The external style sheet is created as a text file with a .css file extension. The embedded style sheet is declared within an MXML file in an <mx:Style> tag set; whereas the inline style is declared as an attribute in an object's MXML declaration.
Which of the following statements are true about the constraint-based layout? Each correct answer represents a complete solution. Choose all that apply.
Answer(s): C,D,E
The constraint-based layout allows users to place objects on the screen with the help of anchors instead of the top-left corner of the container. It can be easily implemented by the Flex Builders Design and Property views or with a code-based approach. A user can fix the objects to the regions, instead of the borders of the container, if he is using the new ConstraintRow and ConstraintColumn classes.Answer options B and A are incorrect. In the constraint-based layout, ConstraintRow and ConstraintColumn are the new classes that are used to fix objects to regions other than the borders of the container.The constraint-based layout does not work in VBox, HBox, ControlBar, or other containers that do not support absolute layout.
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