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RadPanelBar for WinForms
Nikolay Diyanov, Telerik
November 14, 2007
Last modified by
HOW-TO Understand the RadPanelBar control structure.
DESCRIPTION In order to let you achieve a great-looking design of RadPanelBar, it allows you to modify a number of aspects of its visual appearance through a rich set of properties. The purpose of this article is to enable you to understand the structure of the control and allow you to quickly achieve the appearance you desire. General RadControls structure
Let’s start by describing the different types of nodes, marked with different icons in the Control Structure tree. There are four types of nodes in the tree:
The Control Structure of RadPanelBar
We will inspect a RadPanelBar instance that contains three panel groups (of type RadPanelBarGroupElement). The screenshot below shows the RadPanelBar Control Structure tree. RadPanelBarElement (1), which actually represents the RadPanelBar, is on top of the element hierarchy. RadPanelBar has its own BorderPrimitive and FillPrimitive, corresponding to the main border and fill of the RadPanelBar.
RadPanelBarLayout handles the layout of the groups within the RadPanelBar. It contains RadPanelBarGroupElements (2). RadPanelBarGroupElement (2) also has its own BorderPrimitive and FillPrimitive. It also contains ElementWIthCaptionLayoutPanel that dictates the size and position of both parts of the group – caption area and content area. Caption Area
The caption area consists of a FillPrimitive that contains the RadCaptionLayout, which layouts TextPrimitive (5), ImagePrimitive (4) and RadPanelBarCaptionButton. Content Area The content in a RadPanelBarGroupElement is hold by RadPanelBarGroupLayout. In our case, we have different types of RadButtons in the second RadPanelBarGroupElement.
If you go up a little in the hierarchy, you would notice that there are RadScrollBarElements - one for the vertical and one for the horizontal scroll. Each of them has a RadScrollBarThumb and two RadScrollBarButtons.
If you would like to modify the visual appearance of RadPanelBar, but there is no public API that allows that, you can use a ClassSelector or a TypeSelector.
Here is a code snippet:
In the example above, a reference to the fill primitive of the second group is obtained by getting the first occurrence of an element with a class of “BodyFill”. Then you set properties for the fill primitive and get this result:
If you want to change the arrow direction of the RadPanelbarCaptionButton from down to right, you can use a TypeSelector to search for elements of type GroupStatePrimitive:
Please, note that if no elements are found down in the hierarchy, an exception will be thrown.
For additional information on the structure of other RadControls you can refer to the Architecture section of the documentation.
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