FormCheckItem Class
A check box element that serves as a single item in a composite UI structure such as a data entry form, profile page, menu, action sheet, or settings panel.
Namespace: DevExpress.Maui.Editors
Assembly: DevExpress.Maui.Editors.dll
NuGet Package: DevExpress.Maui.Editors
Declaration
public class FormCheckItem :
FormCheckItemBaseRemarks
A FormCheckItem can display header text, description, icon, check box, and arrow. Users can tap the form check item to select or clear the check box.
The following diagram depicts check box item elements:
For a list of all available form items, refer to the following help topic: Form Items.
Add a Form Check Box Item to a Page
Before you proceed, read the following topic:
Once you completed the general setup steps outlined in the article above, declare the DevExpress.Maui.Editors namespace in your markup:
<ContentPage
xmlns:dxe="clr-namespace:DevExpress.Maui.Editors;assembly=DevExpress.Maui.Editors">
<!--...-->
</ContentPage>
You can use any layout class to arrange form items on the form. The following example adds FormCheckItem objects to a VerticalStackLayout. To combine form items into groups, you can use the FormGroupItem:
<ScrollView>
<VerticalStackLayout>
<dxe:FormGroupItem>
<dxe:FormCheckItem .../>
<dxe:FormCheckItem .../>
<!--...-->
</dxe:FormGroupItem>
</VerticalStackLayout>
</ScrollView>
Refer to our repo on GitHub to review the complete source code:
Customize Text Settings
The Text specifies the FormCheckItem‘s primary text (header). Use the following properties to configure a form item’s text and its appearance:
- Text
- Specifies the content of a form item’s primary text.
- TextColor
- Specifies the form item text’s color.
- TextFontAttributes
- Defines font attributes for the form item’s text. You can use the following options:
Bold,Italic, orNone. - TextFontFamily
- Specifies the text’s font name. You can only use fonts previously registered in the app. For more information, refer to: Register Fonts.
- TextFontSize
- Defines the text’s font size.
- TextLineBreakMode
- Specifies the line break mode for a font item’s text.
- TextMargin
- Allows you to set the gaps between the text and other form item elements.
- TextMaxLineCount
- Defines the maximum number of text lines.
The markup below adds a text header to a form check box item and specifies text settings:
<dxe:FormCheckItem Text="Private Chat"
TextColor="Gray"
TextFontAttributes="Bold"
TextFontFamily="OpenSansRegular"
TextFontSize="18"
TextLineBreakMode="CharacterWrap"
TextMargin="4"
TextMaxLineCount="2"/>
Customize Detail Text Settings
The Detail specifies the FormCheckItem’s secondary text (description). Use the following properties to configure a check box item’s detail text and its appearance:
- Detail
- Specifies the content of a form item’s secondary text.
- DetailColor
- Specifies the form item detail’s color.
- DetailFontAttributes
- Defines font attributes for the form item’s detail. You can use the following options:
Bold,Italic, orNone. - DetailFontFamily
- Specifies the detail’s font name. You can only use fonts previously registered in the app. For more information, refer to: Register Fonts.
- DetailFontSize
- Defines the detail’s font size.
- DetailLineBreakMode
- Specifies the line breaking mode for a font item’s detail.
- DetailMargin
- Allows you to set the gaps between the detail and other form item elements.
- DetailMaxLineCount
- Defines the maximum number of detail lines.
<dxe:FormCheckItem Detail="Enables or disables notifications for private messages."
DetailColor="Gray"
DetailFontAttributes="Italic"
DetailFontFamily="OpenSansRegular"
DetailFontSize="12"
DetailLineBreakMode="WordWrap"
DetailMargin="4"
DetailMaxLineCount="3"/>
Respond to User Taps
The API members below allow you to respond to user taps:
- AllowTap
- Specifies whether taps on the form item are allowed.
- TapCommand
- Defines the command that is executed when a user taps the form item.
- TapCommandParameter
- Specifies the
Tapcommand parameter. - Tap
- Occurs when a user taps the form item.
The following example executes a command when a user taps a form item:
<ContentPage ...>
<ContentPage.BindingContext>
<local:SettingsViewModel />
</ContentPage.BindingContext>
<!--...-->
<dxe:FormCheckItem ...
TapCommand="{Binding OnTapCommand}"/>
<!--...-->
</ContentPage>
using System.ComponentModel;
using System.Windows.Input;
namespace FormItemExample;
public class SettingsViewModel : INotifyPropertyChanged {
//...
public ICommand OnTapCommand => new Command(OnFormItemTap);
private void OnFormItemTap() {
// Invoke actions when user taps the form check item.
// ...
}
}
When a user taps the form check box item, the check box state changes. Use the IsChecked property to receive the current check box state. If the IsChecked property is set to null, the form check item is in the indeterminate state. To allow users to set the indeterminate state, enable the AllowIndeterminateInput option. Specify the CheckedColor property to set the check box color in the selected state.
Customize Image
The properties listed in this section allow you to configure the settings of a form check box item image:
- ImageSource
Specifies the image source. In XAML, use the name of an image in the Resources/Images folder to define the source. Ensure that the image’s Build Action is MauiImage.
For more information about images, refer to the following page: Add images to a .NET MAUI app project.
- ImageColor
- Defines the tint color of the form item’s image.
- ImageHeight
- Specifies the height of the form item’s image.
- ImageWidth
- Specifies the width of the form item’s image.
- ImageMargin
- Allows you to set the gaps between the image and other form item elements.
- ImageVerticalOptions
- Specifies how the image is positioned vertically. You can use the following options:
Fill,Center,Start, andEnd. - ImageTemplate
- Defines a template that configures image appearance.
<dxe:FormCheckItem ...
ImageSource="lock"
ImageHeight="36"
ImageWidth="36"
ImageVerticalOptions="Start">
</dxe:FormCheckItem>
Customize Arrow
You can additionally show an Arrow for the form check item. Use the following settings to display the arrow and customize it:
- ShowArrow
- Specifies whether to show the form item’s arrow.
- ArrowColor
- Sets the arrow’s fill color.
- ArrowTemplate
- Specifies a template that configures the arrow’s appearance.
- ArrowMargin
- Allows you to set the gaps between the arrow and other form item elements.
- ArrowVerticalOptions
- Specifies how the arrow is positioned vertically. You can use the following options:
Fill,Center,Start, andEnd.
The following markup customizes the default arrow’s settings for a form item:
<dxe:FormCheckItem ShowArrow="True"
ArrowColor="Gray"
ArrowMargin="10"
ArrowVerticalOptions="Center"/>
Customize Separator
The Separator is a line that separates form items. The settings below allow you to show a form item’s separator and define its appearance:
- ShowSeparator
- Specifies whether the separator is visible.
- SeparatorColor
- Defines the separator’s fill color.
- SeparatorThickness
- Specifies the separator’s thickness.
<dxe:FormCheckItem ShowSeparator="True"
SeparatorColor="LightGray"
SeparatorThickness="1">