Rec editors. It is used in RadComboboxElement, DropDownButton, etc.
Definition
Namespace:Telerik.WinControls.UI
Assembly:Telerik.WinControls.UI.dll
Syntax:
public class DropDownEditorLayoutPanel : DockLayoutPanel, IDisposable, INotifyPropertyChanged, ICustomTypeDescriptor, ISupportSystemSkin, IStylableNodeInheritance: objectDisposableObjectRadObjectRadElementLayoutPanelDockLayoutPanelDropDownEditorLayoutPanel...
Implements:
Inherited Members
Constructors
public DropDownEditorLayoutPanel()Fields
public static RadProperty ArrowPositionPropertypublic static RadProperty ExpandArrowPropertypublic static RadProperty IsArrowButtonPropertypublic static RadProperty IsButtonSeparatorPropertypublic static RadProperty IsContentPropertyProperties
Note: this property is supposed to be used only when this.Parent.AutoSizeMode==WrapAroundChildren
public DropDownButtonArrowPosition ArrowPosition { get; set; }public bool ExpandArrow { get; set; }Methods
Positions and sizes all child elements within the final layout area according to their dock positions.
protected override SizeF ArrangeOverride(SizeF finalSize)The actual size used by the panel, which is the same as arrangeSize.
Overrides:
This method performs the final layout arrangement by:
- Processing child elements in collection order, giving earlier elements priority
- Positioning each element according to its dock setting (Left, Right, Top, Bottom)
- Reducing available space as each element is positioned
- Handling the last child element according to the LastChildFill setting
Docked elements are positioned at their respective edges and consume space in the corresponding direction, while the final element (when LastChildFill is enabled) occupies the remaining central area.
Initializes member fields to their default values. This method is called prior the CreateChildItems one and allows for initialization of members on which child elements depend.
protected override void InitializeFields()Overrides:
Measures the size required to accommodate all child elements with their docking constraints.
protected override SizeF MeasureOverride(SizeF availableSize)A SizeF representing the minimum size needed to display all child elements with their requested dock positions.
Overrides:
This method implements the measurement logic for dock-based layout:
- Measures each child element with the remaining available space
- Accounts for space consumption based on dock positions (Left/Right consume width, Top/Bottom consume height)
- Calculates total space requirements for optimal layout
- Ensures that docked elements don't exceed available constraints
The measurement order follows the child collection sequence, where earlier elements take priority in space allocation, affecting the available space for subsequent elements.