Fluent Design Form

• Mar 14, 2021
• 7 minutes to read

The FluentDesignForm is a Windows 10-inspired form that features:

• An embedded Hamburger Menu (AccordionControl)
• Adaptive Layout mode for the Hamburger Menu
• Acrylic Material effect (a partially transparent texture)
• Reveal Highlight visual effect

This topic consists of the following:

• Add Fluent Design Forms to the Project
• Convert Standard Forms to Fluent Design Forms
• Form Elements
• Acrylic and Reveal Highlight Effects
• Adaptive Layout
• Hamburger Menu Overlaps Title Bar
• Create a Fluent Design Form and Add Header Buttons in Code

Important

Fluent Design Forms cannot be used as MDI containers.

Add Fluent Design Forms

To create a new project with a FluentDesignForm, use the DevExpress Template Gallery‘s Fluent Design Application project template.

Convert Standard Forms to Fluent Design Forms

To convert an existing form to a FluentDesignForm, use the Convert to Fluent Design Form command, which is available from:

• the form’s smart-tag menu
• the FormAssistant component (see Form Assistant)

Change your form’s base class to FluentDesignForm to convert the form manually in code. You also need to add the DevExpress.XtraBars library to your project. See the complete code sample at the end of this help topic.

C#

namespace DXApplication1 {
    public partial class Form1 : DevExpress.XtraBars.FluentDesignSystem.FluentDesignForm {
        public Form1() {
            InitializeComponent();
        }
    }
}

VB.NET

Partial Public Class Form1
        Inherits DevExpress.XtraBars.FluentDesignSystem.FluentDesignForm

        Public Sub New()
            InitializeComponent()
        End Sub
    End Class

Form Elements

A Fluent Design Form creates three controls when it is added to a project using the Template Gallery and Convert to Fluent Design Form commands:

• AccordionControl with the HamburgerMenu view type enabled - Allows you to implement a menu (a navigation control) with custom commands arranged in a simple or hierarchical list.

  HamburgerMenu is one of two view types the AccordionControl provides (the AccordionControl.ViewType property is set to HamburgerMenu). This view type features:

  • the Hamburger button (expands/collapses the menu).

  • three display modes (Inline, Overlay and Minimal). The Fluent Design Form automatically switches between these modes when you resize the form. See the Adaptive Layout section below.

• FluentDesignFormControl - The form’s header, which displays the form’s caption and allows you to show custom commands (bar item links) on its surface.
• FluentDesignFormContainer - Add custom controls to this container to display them in the form’s client region.

Acrylic and Reveal Highlight Effects

The FluentDesignForm.EnableAcrylicAccent setting enables the Acrylic Material (a semi-transparent texture) and Reveal Highlight effects for an embedded Accordion Control (Hamburger Menu). Note that the Accordion Control supports this visual effect in Inline mode only (see the “Adaptive Layout” section below).

Note

Both effects are enabled only if the application runs under Windows 10 Version 1803 (OS build 17134) or newer. Due to the recent changes in Windows API, these effects are temporarily disabled in Windows 10 Build 1903.

Adaptive Layout

When the Adaptive Layout functionality is enabled (the default setting), the Fluent Design Form automatically switches the Hamburger Menu’s display mode between Inline, Overlay and Minimal when you expand or shrink the form.

The table below describes the Hamburger Menu’s display modes (AccordionOptionsHamburgerMenu.DisplayMode) and form widths that trigger display mode switching.

Hamburger Menu’s Display Mode	Form Width
Inline The Hamburger Menu is displayed as a side bar when collapsed, and in-line with the form content when expanded. When the menu is collapsed, the form’s content area is enlarged. Conversely, when the menu is expanded, this area is reduced.	Wide Width is greater than OptionsAdaptiveLayout.InlineModeThreshold. The default property value is 650 pixels.
Overlay The Hamburger Menu is displayed as a side bar when collapsed, and as an overlay above the content area when expanded.	Normal Width is between OptionsAdaptiveLayout.OverlayModeThreshold (default value is 450 pixels) and OptionsAdaptiveLayout.InlineModeThreshold (default value is 650 pixels).
Minimal The Hamburger Menu is rendered as a top-aligned bar with a single item (Hamburger button) when collapsed, and as an overlay above the content area when expanded. Note The Fluent Design Form automatically sets the Hamburger Menu’s DockStyle to Top in Minimal mode, rendering the menu as a bar. In other dock styles, the Hamburger Menu is rendered as a square Hamburger button.	Compact Width is less than OptionsAdaptiveLayout.OverlayModeThreshold. The default property value is 450 pixels.

The OptionsAdaptiveLayout.AdaptiveLayout option is hidden at design time. You can modify it in code as follows.

C#

public partial class Form1 : DevExpress.XtraBars.FluentDesignSystem.FluentDesignForm {
    public Form1() {
        InitializeComponent();
        this.OptionsAdaptiveLayout.AdaptiveLayout = false;
    }
...
}

VB.NET

Public Sub New()
        InitializeComponent()
        Me.OptionsAdaptiveLayout.AdaptiveLayout = False
    End Sub

The Adaptive Layout functionality is not supported when the AccordionControl.ViewType property is set to Standard.

Hamburger Menu Overlaps Title Bar

The Accordion Control (Hamburger Menu) occupies the entire form height in certain skins, so that it overlaps the title bar.

When required, you can disable this behavior by overriding the ExtendNavigationControlToFormTitle virtual property.

C#

public partial class Form1 : FluentDesignForm {
    //...
    protected override bool ExtendNavigationControlToFormTitle {
        get { return false; }
    }
}

VB.NET

Protected Overrides ReadOnly Property ExtendNavigationControlToFormTitle As Boolean
        Get
            Return False
        End Get
    End Property

Note

The title overlap feature is supported when:

• Your form uses one of the following skins:

  • The Bezier

  • Office 2019 Colorful

  • Office 2016 Black

  • Office 2016 Dark

  • Office 2016 Colorful

• The application runs on Windows 10 Version 1803 (OS build 17134) or newer.

Create a Fluent Design Form and Add Header Buttons in Code

The sample below shows how to add and set up the main Fluent Design Form elements in code, and populate the header control with buttons.

C#

using DevExpress.XtraBars;
using DevExpress.XtraBars.FluentDesignSystem;
using System.Windows.Forms;

namespace DXApplication16 {
    public partial class Form1 : FluentDesignForm {
        public Form1() {
            InitializeComponent();
            //Create header control that contains buttons
            FluentDesignFormControl fdfControl = new FluentDesignFormControl();
            //Create buttons
            BarSubItem bsiMain = new BarSubItem() { Caption = "Main" };
            BarButtonItem biNew = new BarButtonItem() { Caption = "New" };
            BarButtonItem biOpen = new BarButtonItem() { Caption = "Open" };
            BarButtonItem biClose = new BarButtonItem() { Caption = "Close" };
            SkinDropDownButtonItem skinItem = new SkinDropDownButtonItem();
            SkinPaletteDropDownButtonItem paletteItem =
                new SkinPaletteDropDownButtonItem();
            //Call BeginInit-EndInit methods to make sure
            //the header control is set up correctly
            fdfControl.BeginInit();
            this.FluentDesignFormControl = fdfControl; //bind header control with form
            this.Controls.Add(fdfControl); //add header control to form
            bsiMain.AddItems(new BarItem[] { biNew, biOpen, biClose }); //fill sub-item
            //BarItems require a BarManager to operate
            //Every FluentDesignFormControl has an internal BarManager
            //Add bar items to the Items collection to assign them to this manager
            fdfControl.Items.AddRange(new BarItem[] {
                skinItem, paletteItem, bsiMain, biNew, biOpen, biClose 
            });
            //Items that the header control should display
            fdfControl.TitleItemLinks.AddRange(new BarItem[] {
                bsiMain, skinItem, paletteItem
            });
            fdfControl.EndInit();

            //FluentDesignFormContainer fills the entire client
            //area of a form and hosts all form controls
            FluentDesignFormContainer fdfContainer = new FluentDesignFormContainer();
            this.ControlContainer = fdfContainer;
            this.Controls.Add(fdfContainer);
            fdfContainer.Dock = DockStyle.Fill;
            fdfContainer.Controls.AddRange(new Control[] {
                //client area controls
            });
        }
    }
}

VB.NET

Imports DevExpress.XtraBars
Imports DevExpress.XtraBars.FluentDesignSystem
Imports System.Windows.Forms

Namespace DXApplication16
    Partial Public Class Form1
        Inherits FluentDesignForm

        Public Sub New()
            InitializeComponent()
            'Create header control that contains buttons
            Dim fdfControl As New FluentDesignFormControl()
            'Create buttons
            Dim bsiMain As New BarSubItem() With {.Caption = "Main"}
            Dim biNew As New BarButtonItem() With {.Caption = "New"}
            Dim biOpen As New BarButtonItem() With {.Caption = "Open"}
            Dim biClose As New BarButtonItem() With {.Caption = "Close"}
            Dim skinItem As New SkinDropDownButtonItem()
            Dim paletteItem As New SkinPaletteDropDownButtonItem()
            'Call BeginInit-EndInit methods to make sure
            'the header control is set up correctly
            fdfControl.BeginInit()
            Me.FluentDesignFormControl = fdfControl 'bind header control with form
            Me.Controls.Add(fdfControl) 'add header control to form
            bsiMain.AddItems(New BarItem() { biNew, biOpen, biClose }) 'fill sub-item
            'BarItems require a BarManager to operate
            'Every FluentDesignFormControl has an internal BarManager
            'Add bar items to the Items collection to assign them to this manager
            fdfControl.Items.AddRange(New BarItem() { skinItem, paletteItem, bsiMain, biNew, biOpen, biClose })
            'Items that the header control should display
            fdfControl.TitleItemLinks.AddRange(New BarItem() { bsiMain, skinItem, paletteItem })
            fdfControl.EndInit()

            'FluentDesignFormContainer fills the entire client
            'area of a form and hosts all form controls
            Dim fdfContainer As New FluentDesignFormContainer()
            Me.ControlContainer = fdfContainer
            Me.Controls.Add(fdfContainer)
            fdfContainer.Dock = DockStyle.Fill
            fdfContainer.Controls.AddRange(New Control() { })
                'client area controls
        End Sub
    End Class
End Namespace