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Rounding Button Corners
Last Post 28 Mar 2012 01:46 PM by kbrownfield. 1 Replies.
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KirkUser is Offline
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21 Mar 2012 07:27 PM
    Does anyone know how to round the corners of Lightswitch buttons?  By buttons, I mean the regular buttons in a screen, not the command bar buttons on the ribbon control nor the buttons in a Datagrid.  I believe the normal way would be to create a theme containing a implicit style for TargetType="Button" and a ControlTemplate with an outer Border using CornerRadius. I tried that with a style for Button in Jan Van Der Haegen's ExtensionsMadeEasy. I also tried it using my own theme extension. But neither will actually change the style for the buttons in a Lightswitch project--I still get the same ole standard rectangular Lightswitch buttons.

    Finally, I tried creating my own button control extension and, of course, I can certainly set a specific style for it, but I would like it to use the selected Lightswitch theme for brushes, but I can't figure out how to reference a dynamic theme's resource dictionary either.

    Can anyone point me in the right direction?  Any idears would be greatly appreciated.
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    28 Mar 2012 01:46 PM
    I finally figured out how to get my Lightswitch button corners rounded.  With a little prompting from Derek Spurlock (if you don't already have the Spursoft Lightswitch Extensions, go get them!), I discovered that if you want to provide style resources beyond colors and fonts, you must have a class that implements IThemeExtension.

    If you follow Microsoft's Walkthrough: Creating a Theme Extension, you will find that you start with a theme XAML file that contains the fonts and color resources for your theme.  You will also find a theme class implementing ITheme that looks something like this:

    Imports System
    Imports System.ComponentModel.Composition
     
    Imports Microsoft.LightSwitch.Theming
     
    Namespace Presentation.Themes
     
        <Export(GetType(ITheme))>
        <Theme(MyTheme.ThemeId, MyTheme.ThemeVersion)>
        Friend Class MyTheme
            Implements ITheme
     
    #Region "ITheme Members"
     
            Public ReadOnly Property ColorAndFontScheme As Uri Implements ITheme.ColorAndFontScheme
                Get
                    Return New Uri("/MyThemeExtension.Client;component/Presentation/Themes/MyTheme.xaml", UriKind.Relative)
                End Get
            End Property
     
            Public ReadOnly Property Id As String Implements ITheme.Id
                Get
                Return MyTheme.ThemeId
                End Get
            End Property
     
            Public ReadOnly Property Version As String Implements ITheme.Version
                Get
                Return MyTheme.ThemeVersion
                End Get
            End Property
     
    #End Region
     
    #Region "Constants"
     
            Friend Const ThemeId As String = "MyThemeExtension:MyTheme"
            Friend Const ThemeVersion As String = "1.0"
     
    #End Region
     
        End Class
     
    End Namespace

    You can then add a very basic button style with rounded corners to the bottom of your theme xaml file:

    <Style TargetType="Button" x:Key="DefaultButtonStyle">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="Button">
                    <Border Name="ButtonBorder"
                           CornerRadius="4"
                           BorderBrush="{StaticResource ButtonBorderBrush}"
                           Background="{StaticResource ButtonBackgroundBrush}">
                        <ContentPresenter Content="{TemplateBinding Content}"
                                                  HorizontalAlignment="Center"
                                                  VerticalAlignment="Center"/>
                    < /Border>
                < /ControlTemplate>
            < /Setter.Value>
        < /Setter>
    < /Style>
     
    <Style TargetType="Button" BasedOn="{StaticResource DefaultButtonStyle}" />


    But if you run and test your extension now, the buttons in your test application will be unaffected by your added style.  To have your style used, you must add a new class to your theme_extension.client project that implements IThemeExtension:

    Imports System.ComponentModel.Composition
    Imports Microsoft.LightSwitch.Theming
     
    Namespace Presentation.Themes
     
        <Export(GetType(IThemeExtension))>
        <ThemeExtension(MyTheme.ThemeId)>
        Friend Class MyStyle
            Implements IThemeExtension
     
            Public Function GetControlStyleResources(themeId As String, themeVersion As String, modules As IEnumerable(Of Microsoft.LightSwitch.Model.IModuleDefinition)) As IEnumerable(Of Uri) Implements IThemeExtension.GetControlStyleResources
                Return New List(Of Uri) From {New Uri("/MyThemeExtension.Client;component/Presentation/Themes/MyTheme.xaml", UriKind.Relative)}
            End Function
        End Class
     
    End Namespace

    Now when you run and test your extension you will see that the buttons have the rounded-corner style!

    If you prefer, as I do, to use ExtensionsMadeEasy so you can modify your theme from inside your Lightswitch application, change the theme class to inherit from EasyThemeWithExtensionExporter instead of EasyThemeExporter and implement IThemeExtension:

    Imports ExtensionsMadeEasy.ClientAPI.Theme
    Imports Microsoft.LightSwitch.Theming
    Imports System.ComponentModel.Composition
     
    Namespace LightSwitchApplication
     
        Public Class MyTheme
            Inherits EasyThemeWithExtensionsExporter(Of MyTheme, MyTheme)
            Implements ITheme, IThemeExtension
     
            Public ReadOnly Property ColorAndFontScheme As Uri Implements ITheme.ColorAndFontScheme
                Get
                    Return New Uri(String.Format("/{0};component/Theme/{1}", Me.GetType.Assembly.FullName.Split(",")(0), "MyTheme.xaml"), UriKind.Relative)
                End Get
            End Property
     
            Public ReadOnly Property Id As String Implements ITheme.Id
                Get
                    Return "My Theme"
                End Get
            End Property
     
            Public ReadOnly Property Version As String Implements ITheme.Version
                Get
                    Return "1.0"
                End Get
            End Property
     
            Public Function GetControlStyleResources(themeId As String, themeVersion As String, modules As IEnumerable(Of Model.IModuleDefinition)) As IEnumerable(Of Uri) Implements IThemeExtension.GetControlStyleResources
                Return New List(Of Uri) From {New Uri(String.Format("/{0};component/Theme/{1}", Me.GetType.Assembly.FullName.Split(",")(0), "MyTheme.xaml"), UriKind.Relative)}
            End Function
     
        End Class
     
    End Namespace

    Either method will allow you to use your own styles for the buttons in Lightswitch.

    Kirk
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