Blackberry Smartphones Specifications download pdf (Page 68)

Tree views

Use a tree view to display objects, such as folders, in a hierarchical manner.

Objects in the tree view are nodes. The highest node is the root node. A node in the tree can have child nodes under it. A node

that has a child is a parent node.

Users can perform the following action in a tree view:

Action BlackBerry devices with a trackpad only

BlackBerry devices with a touch screen

and a trackpad

Expand or collapse an object

with a plus sign (+) or minus sign

(-) in a hierarchy.

Press the Space key or click the trackpad.

• Tap the object.

• Press the Space key.

• Click the trackpad.

Best practice: Implementing tree views

• Use the TreeField class to create tree views. For more information about creating tree views, see the API reference for

the BlackBerry® Java® SDK and the BlackBerry Java Application UI Quick Reference Guide.

• Provide a pop-up menu if users can perform multiple actions when they click a parent node.

• Include a root node only if users need the ability to perform actions on the entire tree. Otherwise, exclude the root node.

Buttons

Use buttons to allow users to perform an action from a dialog box. Menus typically include actions that are associated with a screen.

UI Guidelines

Buttons

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Blackberry Smartphones Specifications Page 68