View and Panel Designer in QPR UI

In the View Properties, you can define the Name, Description, and Context of the view. In addition, you can define how much the aspect ratio of the view is allowed to change from the initial aspect ratio in different sized screens.

Presentation tab

The View's Presentation tab contains following settings:

• Aspect ratio flex: Decimal number determining how much the view content's aspect ratio (width divided by height) is allowed to vary. Note that this setting doesn't affect the aspect ratio of the view itself, but only its contents, i.e. panels.
  • The view has a design aspect ratio which is determined by how panels are arranged in the view designer. Note that the whole available design area doesn't matter - only the actual panels determine the shown area and the design aspect ratio.
  • Aspect ratio calculation rule: If design aspect ratio is A and aspect ratio flex is B, the view's aspect ratio is allowed to change between A/B and A*B. Example: If design aspect ratio is 2 and aspect ratio flex is 4, the view's aspect ratio is allowed to vary between 0.5 and 8 (2/4=0.5 and 2*4=8).
  • View contents always take all available space horizontally. If the aspect ratio's lower limit is reached (i.e. view contents are not allowed use all available space vertically), there may be empty space in the bottom of the view. If the aspect ratio's higher limit is reached (i.e. view contents don't fit vertically), the view has a vertical scrollbar.
  • The aspect ratio flex is useful e.g. for views which don't work properly if the aspect ratio stretches to too extreme.
• Inner margin: Horizontal and vertical space between the panels in the view. Defined in pixels.
• Outer margin: Space between the panels and the view outer border. Defined in pixels.
• Background color: Background color of the view. Panels inside the view may have other background colors than the view.

Defining View Properties and Variables

To define context variables, type in the name of the variable to the text field and click the check mark. After that, you can click the value field and type in the value for your context variable. Context variables starting with "sys:" are system variables which have special purpose in QPR UI - use them only for their intended purpose. The Behavior selection affects the context variable used explained in Context Variable Behaviors. To see what context variable values are used in the view, panel, or presentation object, select the Show effective context check box in the Context tab of the view, panel, or presentation object properties pages.

Variables Usage Example

There is a view with one panel, in which there is one presentation object. The Session variable values are defined as follows:

Variable name	Value
AccountManager	John Smith
Country	Sweden

In the View Properties, the following variable values are defined:

Variable name	Value	Behavior
AccountManager	William Taylor	Stored variable
CustomerGroup	Kids	Local variable

In the Panel Properties, the following variable values are defined:

Variable name	Value	Behavior
AccountManager	Susan Chapman	Local variable
Country	Finland	Local variable

In the Presentation Object Properties, the following variable values are defined:

Variable name	Value	Behavior
ProductGroup	Umbrellas	Stored variable

In the Effective View Context, these result into the values shown below. Note the Source column displaying the information where the effective context comes from:

Variable name	Value	Source	Scope
AccountManager	William Taylor	Scope of the view	View
Country	Sweden	Inherited from session context	Session
CustomerGroup	Kids	Scope of the view	View

In the Effective Panel Context, these result into the values shown below. Note the Source column displaying the information where the effective context comes from:

Variable name	Value	Source	Scope
AccountManager	Susan Chapman	Initialized from the panel's context	Panel
Country	Finland	Initialized from the panel's context	Panel
CustomerGroup	Kids	Inherited from the effective context of the view	View

In the Effective Presentation Object Context, these result into the values shown below. Note the Source column displaying the information where the effective context comes from:

Variable name	Value	Source	Scope
AccountManager	Susan Chapman	Inherited from the effective context of the panel	Panel
Country	Finland	Inherited from the effective context of the panel	Panel
ProductGroup	Umbrellas	Scope of the presentation object	Presentation object
CustomerGroup	Kids	Inherited from the effective context of the view	View

To put it more concisely, the context variable values (and their behaviors) are as follows:

Context Variable	Session	View	Panel	Presentation Object
AccountManager	John Smith	William Taylor (Stored variable)	Susan Chapman (Local variable)
Country	Sweden		Finland (Local variable)
ProductGroup				Umbrellas (Stored variable)
CustomerGroup		Kids (Local variable)

The effective context values are:

Context Variable	Session	View	Panel	Presentation Object
AccountManager	John Smith	William Taylor	Susan Chapman	Susan Chapman
Country	Sweden	Sweden	Finland	Finland
ProductGroup				Umbrellas
CustomerGroup		Kids	Kids	Kids