LayoutGroup Class
A container for items and groups.
Namespace: DevExpress.Xpf.Docking
Assembly: DevExpress.Xpf.Docking.v24.2.dll
NuGet Package: DevExpress.Wpf.Docking
Declaration
public class LayoutGroup :
BaseLayoutItem,
IGeneratorHost,
ILogicalOwner,
IInputElement,
ISupportOriginalSerializableName,
IItemContainerRelated API Members
The following members return LayoutGroup objects:
Remarks
The DockLayoutManager control allows you to use LayoutGroups both in dock and layout UIs.
When a LayoutGroup includes a LayoutPanel, the group creates the dock UI. If it includes a LayoutControlItem, the group creates a layout UI.
This document describes how to use LayoutGroups in the dock UI only.
Tip
Refer to the following topic for more information on how to use LayoutGroups in layout UI: Layout UI Items.
Create LayoutGroups
The DockLayoutManager should always have a root group. Refer to the following topic for more information: Layout Groups.
In XAML
The following code sample creates a root LayoutGroup (LayoutRoot) that contains two LayoutPanels:
<Window ...
xmlns:dxdo="http://schemas.devexpress.com/winfx/2008/xaml/docking">
<Grid>
<dxdo:DockLayoutManager>
<dxdo:LayoutGroup x:Name="LayoutRoot" Orientation="Vertical" >
<dxdo:LayoutPanel Caption="Panel1"/>
<dxdo:LayoutPanel Caption="Panel2"/>
</dxdo:LayoutGroup>
</dxdo:DockLayoutManager>
</Grid>
</Window>
In Code
The following code sample adds a LayoutGroup with a nested LayoutPanel (Tools):
LayoutGroup layoutgroup = new LayoutGroup();
LayoutPanel layoutpanel = new LayoutPanel() { Caption = "Tools" };
layoutgroup.Add(layoutpanel);
DockLayoutManager1.DockController.Dock(layoutgroup);
Child Items
LayoutGroups can contain the following child objects:
- Layout (Dock) Panel - A regular dock panel.
- Tabbed Group - A tabbed container.
- Document Group - An MDI or tabbed item container.
- another Layout Group.
Customize LayoutGroups
| Property | Description |
|---|---|
| Orientation | Specifies the LayoutGroup‘s child items orientation. |
| The BaseLayoutItem’s VerticalAlignment and HorizontalAlignment | Specify the LayoutGroup‘s alignments. |
| AllowSplitters | Specifies whether a user can resize the LayoutGroup‘s child items. |
| BaseLayoutItem.ItemHeight and BaseLayoutItem.ItemWidth | Specify the LayoutGroup‘s height and width. |
| LayoutItemInterval | Gets or sets the distance between immediate child dock items. This is a dependency property. |
| LayoutGroupInterval | Gets or sets the distance between immediate child LayoutGroup objects. This is a dependency property. |
| DockItemInterval | Gets or sets the distance between immediate child LayoutControlItem objects. This is a dependency property. |
Runtime Operations
Use the following DockLayoutManager.DockController object’s methods to control a LayoutGroup:
| Method | Description |
|---|---|
| AddPanel | Creates a LayoutPanel and docks it at the specified side of the DockLayoutManager container (root group). |
| Close(BaseLayoutItem) | Closes the specified item. |
| CloseAllButThis(BaseLayoutItem) | Closes all items except the specified one within this item’s container. |
| Dock | Docks the specified item. This method is in effect for newly created, floating, auto-hidden, or closed (hidden) items. |
| Float(BaseLayoutItem) | Makes the specified item floating. |
| Hide | Enables the auto-hide mode for the item/panel and hides it at a corresponding edge of the DockLayoutManager container. |
| Insert(LayoutGroup, BaseLayoutItem, Int32) | Inserts the specified item into the specified group at a specific position. |
| Rename(BaseLayoutItem) | Starts dock item renaming. |
| Restore(BaseLayoutItem) | Restores a closed (hidden) panel at its previous dock position. |
Events
Use the following DockLayoutManager events to control a dock element at runtime:
| Event | Description |
|---|---|
| DockItemActivated | Fires after a dock item has been activated. |
| DockItemActivating | Fires before a dock item is activated, and allows you to prevent this action. |
| DockItemClosed | Fires after a dock item has been closed (hidden). |
| DockItemClosing | Fires before a dock item is closed (hidden), and allows you to prevent this action. |
| DockItemCollapsed | Fires after a visible auto-hidden dock panel has slid away. |
| DockItemDocking | Fires before a dock item is dragged over dock hints, and allows you to prevent dock zones from being displayed. |
| DockItemDragging | Fires repeatedly while a dock panel is being dragged. |
| DockItemEndDocking | Fires after a dock item has been dropped, and allows you to prevent this action. |
| DockItemExpanded | Fires after a hidden auto-hidden dock panel has slid out. |
| DockItemHidden | Fires after a dock item has been made auto-hidden. |
| DockItemHiding | Fires before a dock item is auto-hidden, and allows you to prevent this action. |
| DockItemRestored | Fires after a dock item has been restored from the closed (hidden) state. |
| DockItemRestoring | Fires before a dock item is restored from the closed (hidden) state, and allows you to prevent this action. |
| DockItemStartDocking | Fires when a docking operation starts, and allows you to prevent this operation. |
Related GitHub Examples
The following code snippets (auto-collected from DevExpress Examples) contain references to the LayoutGroup class.
Note
The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.