Cover Sheet

The ins and outs of displaying and styling cover sheets

Cover sheets are a commonly patterned way to present information to a user that doesn't rely on changing the navigation stack.

Cover sheets cannot be opened within cover sheets. Some blocks utilize cover sheets to reveal content or forms, so be sure not to include these blocks in the navigation stack.

Android

Currently, there is not a ton of Android functionality. It works similarly to a PushPage but has an animation that slides from bottom to top instead of from right to left.

If you set IsNavigationPage to false, Android users won't have a way to close the cover sheet. You'll need a custom button that uses the CloseCoverSheet command.

Parameters

Listed below are the options provided via the ShowCoverSheetCommandParameters object.

Property	Type	Description
PageGuid	Guid	The Guid of the page to display in the cover sheet. Use this instead of Content.
Content	View	The content to display inside of the cover sheet. Use this instead of PageGuid.
ModalPresentationStyle	ModalPresentationStyle	[iOS ONLY] The way that the sheet is presented. There are currently four accepted values: FormSheet, PageSheet, FullScreen and OverFullScreen. Defaults to FormSheet.
IsNavigationPage	bool	Whether or not the page displayed should be converted into a page that has a toolbar with a dismiss button. Defaults to true.
SheetTitle	string	The title of the sheet, displays in the middle of the navigation bar.
DismissButtonText	string	The text to use in the dismiss button, seen in the toolbar (navigation bar) of the sheet. Defaults to Cancel.
ShowNavigationBar	bool	Whether or not this instance should show a navigation bar. IsNavigationPage must be enabled. (defaults to false)
PrimaryActionButton	Button	The button to use as the primary action in the top right corner of cover sheets.
SecondaryActionButton	Button	The button to use as the secondary action in the top left corner of cover sheets.

Styling

You can style the Navigation Bar itself by targeting the cover-sheet class. For example, if you want to change the background bar color, text color, and remove the FullScreen separator:

.cover-sheet {
    -maui-bar-background-color: green;
    -maui-bar-text-color: #ffffff;
    -rock-status-bar-text: light;
    -rock-ios-hide-navigation-bar-separator: true;
}

Setting -rock-ios-hide-navigation-bar-separator: true; works on initial page loads, but changing the OS theme will reveal this separator on the current page.

Examples

To show a cover sheet that displays another page, pass in the PageGuid as the CommandParameter.

<!-- Cover sheet used to display another page as content. -->
<Button Text="Tap"
    StyleClass="btn, btn-primary"
    Command="{Binding ShowCoverSheet}"
    CommandParameter="71e80253-8d10-426b-8182-65dafe9b695f" />

To show a cover sheet from provided XAML content, pass in the XAML content you want to render inside of the CommandParameter.

<!-- Cover sheet with content as the parameter. -->
<Button Text="Tap"
    StyleClass="btn, btn-primary"
    Command="{Binding ShowCoverSheet}">
    <Button.CommandParameter>
        <StackLayout>
            <Label Text="This is cover sheet content."
                StyleClass="h1" />
        </StackLayout>
    </Button.CommandParameter>
</Button>

Here is an extensive example with most of the ShowCoverSheetParameters properties utilized.

<Button Text="Tap"
    StyleClass="btn, btn-primary"
    Command="{Binding ShowCoverSheet}">
    <Button.CommandParameter>
        <Rock:ShowCoverSheetParameters SheetTitle="Title" 
            ModalPresentationStyle="FullScreen">
            <Rock:ShowCoverSheetParameters.Content>
                <StackLayout>
                    <Label Text="This is cover sheet content."
                        StyleClass="h3" />
                </StackLayout>
            </Rock:ShowCoverSheetParameters.Content>
            <Rock:ShowCoverSheetParameters.PrimaryActionButton>
                <Button Command="{Binding ShowToast}" 
                    Text="Toast"
                    CommandParameter="That was a unique use of the PrimaryActionButton..." />
            </Rock:ShowCoverSheetParameters.PrimaryActionButton>
            <Rock:ShowCoverSheetParameters.SecondaryActionButton>
                <Button Command="{Binding CloseCoverSheet}" 
                    Text="Dismiss" />
            </Rock:ShowCoverSheetParameters.SecondaryActionButton>
        </Rock:ShowCoverSheetParameters>
    </Button.CommandParameter>
</Button>

Closing a Cover Sheet

To close any open cover sheet, use the CloseCoverSheet command.

<Button Text="Tap" Command="{Binding CloseCoverSheet}" />