DxRichEdit.CustomizeRibbon Event

Allows you to customize the Rich Text Editor’s ribbon.

Namespace: DevExpress.Blazor.RichEdit

Assembly: DevExpress.Blazor.RichEdit.v25.1.dll

NuGet Package: DevExpress.Blazor.RichEdit

Declaration

[Parameter]
public EventCallback<IRibbon> CustomizeRibbon { get; set; }

Parameters

Type	Description
IRibbon	The ribbon model. Requires the DevExpress.Blazor.Office namespace.

Remarks

The Rich Text Editor displays the built-in ribbon that consists of multiple tabs. A tab includes groups, and a group can contain various items. Handle the CustomizeRibbon event to access and customize the built-in ribbon’s settings before the control is initialized.

Run Demo: Ribbon Customization

Refer to the following section for more information on how to customize the Rich Text Editor’s ribbon dynamically: Runtime Ribbon Customization.

Modify the Tab Collection

Access Tabs

The CustomizeRibbon event’s parameter allows you to access the built-in ribbon. Use the ribbon’s Tabs property to access the tab collection. You can get a tab by its name or index:

<DxRichEdit CustomizeRibbon=OnCustomizeRibbon />

@code {
    void OnCustomizeRibbon(IRibbon ribbon) {
        // Accesses the first tab
        IRibbonTab firstTab = ribbon.Tabs[0];
        // Accesses the Layout tab
        IRibbonTab tableTab = ribbon.Tabs[RichEditRibbonTabNames.TableLayout];
    }
}

Add Default Tabs

Call an Add method overload to add a predefined tab with the specified name to the tab collection. The RichEditRibbonTabNames class allows you to obtain names of all built-in tabs. Refer to the following article for more information about built-in elements: Built-in Toolbar Elements in Blazor Rich Text Editor.

The following code snippet customizes the ribbon as follows:

• Clears the tab collection.
• Adds the default File and Home tabs to the collection.

<DxRichEdit CustomizeRibbon=OnCustomizeRibbon />

@code {
    void OnCustomizeRibbon(IRibbon ribbon) {
        ribbon.Tabs.Clear();
        // Inserts the Home tab at the end of the tab collection
        ribbon.Tabs.Add(RichEditRibbonTabNames.Home);
        // Inserts the File tab at the first position in the tab collection
        ribbon.Tabs.Add(0, RichEditRibbonTabNames.File);
    }
}

Add Custom Tabs

Call an AddCustomTab method overload to create a custom tab and add it to the tab collection. You should add a group that contains items to the new tab to make it visible because the Rich Text Editor hides tabs that contain no visible and enabled items.

The following code snippet inserts custom tabs and populates them with default groups.

<DxRichEdit CustomizeRibbon=OnCustomizeRibbon />

@code {
    void OnCustomizeRibbon(IRibbon ribbon) {
        // Clears the tab collection
        ribbon.Tabs.Clear();
        // Inserts a custom tab at the end of the tab collection
        IRibbonTab tableTab = ribbon.Tabs.AddCustomTab("Table");
        tableTab.Groups.Add(RichEditRibbonGroupNames.LayoutRowsAndColumns);
        tableTab.Groups.Add(RichEditRibbonGroupNames.DesignBordersAndShadings);
        // Inserts a custom tab at the first position in the tab collection
        IRibbonTab fileTab = ribbon.Tabs.AddCustomTab(0, "File");
        IBarGroup fileGroup = fileTab.Groups.Add(RichEditRibbonGroupNames.FileCommon);
    }
}

Customize Tabs

Use a tab’s properties to change its visibility and appearance. The following code snippet customizes the Layout tab:

<DxRichEdit CustomizeRibbon=OnCustomizeRibbon />

@code {
    void OnCustomizeRibbon(IRibbon ribbon) {
        IRibbonTab tableTab = ribbon.Tabs[RichEditRibbonTabNames.TableLayout];
        tableTab.Text = "Table";
        tableTab.GetVisible = () => true;
        tableTab.Groups.AddCustomGroup(0).Items.Add(RichEditBarItemNames.ShowInsertTableDialog);
    }
}

Remove Tabs

The Remove method overloads allow you to remove a tab with the specified name or index from the tab collection. To remove all tabs from the collection, call the Clear() method.

<DxRichEdit CustomizeRibbon=OnCustomizeRibbon />

@code {
    void OnCustomizeRibbon(IRibbon ribbon) {
        // Removes the first tab
        ribbon.Tabs.Remove(0);
        // Removes the File tab
        ribbon.Tabs.Remove(RichEditRibbonTabNames.File);
        // Removes all tabs
        ribbon.Tabs.Clear();
    }
}

Modify the Group Collection

Access Groups

A tab’s Groups property allows you to access this tab’s group collection. You can get a group by its name or index:

<DxRichEdit CustomizeRibbon=OnCustomizeRibbon @bind-Selection=@selection />

@code {
    Selection selection;

    void OnCustomizeRibbon(IRibbon ribbon) {
        BarGroupCollection groups = ribbon.Tabs[RichEditRibbonTabNames.Insert].Groups;
        // Accesses the first group
        IBarGroup firstGroup = groups[0];
        // Accesses the Header and Footer group
        IBarGroup secondGroup = groups[RichEditRibbonGroupNames.InsertHeaderAndFooter];
    }
}

Add Default Groups

The Add method overloads allow you to add a predefined group with the specified name to the group collection. The RichEditRibbonGroupNames class allows you to obtain names of all built-in ribbon groups. Refer to the following article for more information about built-in elements: Built-in Toolbar Elements in Blazor Rich Text Editor.

The following code snippet accesses the first tab’s group collection and adds the default Full Screen and Undo/Clipboard groups to this collection:

<DxRichEdit CustomizeRibbon=OnCustomizeRibbon />

@code {
    void OnCustomizeRibbon(IRibbon ribbon) {
        BarGroupCollection groups = ribbon.Tabs[0].Groups;
        // Inserts the Undo/Clipboard group at the end of the group collection
        groups.Add(RichEditRibbonGroupNames.HomeUndoClipboard);
        // Inserts the Full Screen group at the first position in the group collection
        groups.Add(0, RichEditRibbonGroupNames.ViewFullScreen);
    }
}

Add Custom Groups

The AddCustomGroup method overloads allow you to add a custom group to a ribbon tab or toolbar. Use the Items property to populate the group with items. The Rich Text Editor hides empty groups and groups that contain no visible and enabled items.

The following code snippet customizes the ribbon as follows:

• Creates a new contextual Table Tools tab. This tab appears when a user creates or edits a table.
• Adds custom groups to the tab.
• Populates the groups with default items.

<DxRichEdit CustomizeRibbon=OnCustomizeRibbon />

@code {
    void OnCustomizeRibbon(IRibbon ribbon) {
        IRibbonTab tableToolsTab = ribbon.Tabs.AddCustomTab("Table Tools", RichEditRibbonContextTabType.Table);
        // Inserts a new group at the end of the group collection
        IBarGroup secondGroup = tableToolsTab.Groups.AddCustomGroup();
        secondGroup.Items.Add(RichEditBarItemNames.MergeTableCells);
        secondGroup.Items.Add(RichEditBarItemNames.ShowSplitCellsDialog);
        // Inserts a new group at the first position in the group collection
        IBarGroup firstGroup = tableToolsTab.Groups.AddCustomGroup(0);
        firstGroup.Items.Add(RichEditBarItemNames.InsertTableElementsMenu);
        firstGroup.Items.Add(RichEditBarItemNames.DeleteTableElementsMenu);
    }
}

Customize Groups

Use a group’s properties to customize its visibility and appearance. The following code snippet customizes the first group of the Insert tab:

<DxRichEdit CustomizeRibbon=OnCustomizeRibbon @bind-Selection=@selection />

@code {
    Selection selection;

    void OnCustomizeRibbon(IRibbon ribbon) {
        IBarGroup firstGroup = ribbon.Tabs[RichEditRibbonTabNames.Insert].Groups[0];
        firstGroup.Text = "Insert Fields";
        firstGroup.IconUrl = "your-icon-url";
        firstGroup.GetVisible = () => selection.ActiveSubDocument.Type != SubDocumentType.TextBox;
        firstGroup.Items.Clear();
        firstGroup.Items.Add(RichEditBarItemNames.InsertFieldMenu);
    }
}

Remove Groups

The Remove method overloads allow you to remove a group with the specified name or index from the group collection. To remove all groups from the collection, call the Clear() method.

<DxRichEdit CustomizeRibbon=OnCustomizeRibbon />

@code {
    void OnCustomizeRibbon(IRibbon ribbon) {
        IRibbonTab homeTab = ribbon.Tabs[RichEditRibbonTabNames.Home];
        // Removes the first group
        homeTab.Groups.Remove(0);
        // Removes the Font group
        homeTab.Groups.Remove(RichEditRibbonGroupNames.HomeFont);
        // Removes all groups
        homeTab.Groups.Clear();
    }
}

Modify the Item Collection

Access Items

A group‘s Items property allows you to access the collection of this group’s items. An item collection can contain various items of the following types:

• Button
• Checkable button
• Color edit
• Combo box
• Drop down
• Spin edit

You can get an item by its name or index:

<DxRichEdit CustomizeRibbon=OnCustomizeRibbon />

@code {

    void OnCustomizeRibbon(IRibbon ribbon) {
        IRibbonTab homeTab = ribbon.Tabs[RichEditRibbonTabNames.Home];
        IBarGroup fontGroup = homeTab.Groups[RichEditRibbonGroupNames.HomeFont];
        // Accesses the first item
        IBarItem firstItem = fontGroup.Items[0];
        // Accesses the Font Size item
        IBarItem fontSizeItem = fontGroup.Items[RichEditBarItemNames.FontSize];
    }
}

Add Default Items

The Add method overloads allow you to add a predefined item with the specified name to the item collection. The RichEditBarItemNames class allows you to obtain names of all built-in items. Refer to the following article for more information about built-in elements: Built-in Toolbar Elements in Blazor Rich Text Editor.

The following code snippet adds the Insert Date Field and Insert Time Field items to the Insert Header and Footer group on the Insert tab.

<DxRichEdit CustomizeRibbon=OnCustomizeRibbon />

@code {
    void OnCustomizeRibbon(IRibbon ribbon) {
        IRibbonTab insertTab = ribbon.Tabs[RichEditRibbonTabNames.Insert];
        IBarGroup group = insertTab.Groups[RichEditRibbonGroupNames.InsertHeaderAndFooter];
        // Inserts the Insert Time Field item at the end of the item collection
        group.Items.Add(RichEditBarItemNames.InsertTimeField);
        // Inserts the Insert Date Field item at the first position in the item collection
        group.Items.Add(0, RichEditBarItemNames.InsertDateField);
    }
}

Add Custom Items

Call one of the following method overloads to create a custom item and add it to the item collection:

• AddCustomButton

• AddCustomCheckButton

• AddCustomColorEdit

• AddCustomComboBox

• AddCustomDropDown

• AddCustomSpinEdit

The following code snippet adds custom button and combo box items that allow users to export an open document:

<DxRichEdit @ref=@rich DocumentFormat=@documentFormat @bind-Modified=@modified 
    CustomizeRibbon=OnCustomizeRibbon/>

@code {
    DxRichEdit rich;
    DocumentFormat documentFormat = DocumentFormat.OpenXml;
    bool modified = false;

    void OnCustomizeRibbon(IRibbon ribbon) {
        ribbon.Tabs[RichEditRibbonTabNames.File].Groups.Clear();
        IBarGroup fileGroup = ribbon.Tabs[RichEditRibbonTabNames.File].Groups.AddCustomGroup(0);
        // Inserts a custom combo box at the end of the item collection
        IBarComboBox documentFormatComboBox = fileGroup.Items.AddCustomComboBox(
            () => documentFormat,
            (value) => Task.FromResult(documentFormat = (DocumentFormat)value)
        );
        documentFormatComboBox.Items.Add("DOCX", DocumentFormat.OpenXml);
        documentFormatComboBox.Items.Add("RTF", DocumentFormat.Rtf);
        // Inserts a custom button at the first position in the item collection
        IBarButton exportButton = fileGroup.Items.AddCustomButton(0, "Export", DownloadDocumentAsync);  
    }

    async Task DownloadDocumentAsync() {
        if (documentFormat == DocumentFormat.OpenXml)
            await rich.ExportDocumentAsync("C:\\Users\\Public\\annual-report.docx", documentFormat);
        else
            await rich.ExportDocumentAsync("C:\\Users\\Public\\annual-report.rtf", documentFormat);
    }
}

Customize Items

Use an item’s properties to customize its visibility, appearance, and behavior.

The following code snippet customizes a drop-down item.

<DxRichEdit @ref=@rich CustomizeRibbon=OnCustomizeRibbon @bind-ReadOnly="@readOnly"/>

@code {
    DxRichEdit rich;
    bool readOnly;

    void OnCustomizeRibbon(IRibbon ribbon) {
        IRibbonTab pageLayoutTab = ribbon.Tabs[RichEditRibbonTabNames.PageLayout];
        IBarGroup pageSetupGroup = pageLayoutTab.Groups[RichEditRibbonGroupNames.PageSetup];
        IBarItem paperSizeMenuItem = pageSetupGroup.Items[RichEditBarItemNames.PaperSizeMenu];
        if (paperSizeMenuItem.Type == BarItemTypes.DropDown) {
            IBarDropDown paperSizeDropDown = (IBarDropDown)paperSizeMenuItem;
            paperSizeDropDown.Items.Clear();
            paperSizeDropDown.Items.Add(RichEditBarItemNames.PaperSizeA4);
            paperSizeDropDown.Items.Add(RichEditBarItemNames.PaperSizeA5);
            paperSizeDropDown.Items.Add(RichEditBarItemNames.PaperSizeA6);
            paperSizeDropDown.GetEnabled = () => rich.ViewType == ViewType.PrintLayout;
            paperSizeDropDown.IconUrl = "your-item-icon-url";
        }
        paperSizeMenuItem.Text = "Paper Size";
        paperSizeMenuItem.Tooltip = "Choose a paper size.";
        paperSizeMenuItem.GetVisible = () => !readOnly;
    }
}

Remove Items

The Remove method overloads allow you to remove an item with the specified name or index from the item collection. To remove all items from the collection, call the Clear() method.

<DxRichEdit CustomizeRibbon=OnCustomizeRibbon/>

@code {

    void OnCustomizeRibbon(IRibbon ribbon) {
        IRibbonTab fileTab = ribbon.Tabs[RichEditRibbonTabNames.File];
        IBarGroup fileCommonGroup = fileTab.Groups[RichEditRibbonGroupNames.FileCommon];
        // Removes the first item
        fileCommonGroup.Items.Remove(0);
        // Removes the Download Menu item
        fileCommonGroup.Items.Remove(RichEditBarItemNames.DownloadMenu);
        // Removes all items
        fileCommonGroup.Items.Clear();
    }
}

Runtime Ribbon Customization

The Rich Text Editor automatically disables items and hides tabs and groups that contain no visible or enabled items. You can use the following properties to disable items and hide tabs, groups, or items at runtime manually:

GetVisible

Accepts a method that defines display criteria for a tab, group, or item.

GetEnabled

Accepts a method that defines enable criteria for an item.

The following code snippet changes a tab’s visibility and an item’s availability dynamically.

<DxRichEdit @ref=@rich CustomizeRibbon=OnCustomizeRibbon @bind-ReadOnly="@readOnly"/>

@code {
    DxRichEdit rich;
    bool readOnly;

    void OnCustomizeRibbon(IRibbon ribbon) {
        IRibbonTab pageLayoutTab = ribbon.Tabs[RichEditRibbonTabNames.PageLayout];
        pageLayoutTab.GetVisible = () => !readOnly;
        IBarGroup pageSetupGroup = pageLayoutTab.Groups[RichEditRibbonGroupNames.PageSetup];
        IBarItem paperSizeMenuItem = pageSetupGroup.Items[RichEditBarItemNames.PaperSizeMenu];
        paperSizeMenuItem.GetEnabled = () => rich.ViewType == ViewType.PrintLayout;
    }
}

Handle Item Exceptions

The Rich Text Editor runs asynchronous code to respond to user actions. Use the BarItemExceptionRaised event to handle runtime exceptions that occur after a user interacts with an item in the ribbon.

The following code snippet writes exception log messages:

RibbonCustomization.razor

@inject ILogger<RibbonCustomization> Logger;
@using Microsoft.Extensions.Logging;

<DxRichEdit CustomizeRibbon=OnCustomizeRibbon 
            BarItemExceptionRaised=OnBarItemExceptionRaised />

@code {
    void OnCustomizeRibbon(IRibbon ribbon) {
        // ...
    }
    void OnBarItemExceptionRaised(BarItemExceptionEventArgs args) {
        Logger.LogError(args.Exception, args.Exception.Message);
        args.Handled = true;
    }
}