/Source Code/PowerSong/Custom Controls/SongsListItem.vb

Imports PowerSong.SongDatabase

Imports PowerSong.SongDatabase.Items



Public Class SongsListItem



    Friend Const ICON_HEIGHT As Integer = 40



    Private Shared FIconCache As New ImageCache



    Private FIcon As Image = Nothing



    Public ReadOnly Property Icon() As Image

        Get

            If FIcon Is Nothing Then FIcon = CreateIcon()

            Return FIcon

        End Get

    End Property



    Private FItem As BaseItem = Nothing



    Public Property Item() As BaseItem

        Get

            Return FItem

        End Get

        Set(ByVal value As BaseItem)

            FItem = value

            RaiseEvent NeedsRepainting()

        End Set

    End Property



    Private FStyle As Style = Nothing



    Public Property Style() As Style

        Get

            Return FStyle

        End Get

        Set(ByVal value As Style)

            FStyle = value

            RaiseEvent NeedsRepainting()

        End Set

    End Property



    Private FOverrideBackground As OverrideBackground = Nothing



    Public Property OverrideBackground() As OverrideBackground

        Get

            Return FOverrideBackground

        End Get

        Set(ByVal value As OverrideBackground)

            FOverrideBackground = value

            FIcon = Nothing

            RaiseEvent NeedsRepainting()

        End Set

    End Property



    Public Event NeedsRepainting()



    Public Sub New(ByVal item As BaseItem, _

                   ByVal style As Style, _

                   Optional ByVal overrideBackground As OverrideBackground = Nothing)



        FItem = item

        FStyle = style

        FOverrideBackground = overrideBackground



    End Sub



    Public Sub RefreshIcon()

        FIcon = Nothing

        RaiseEvent NeedsRepainting()

    End Sub



    Private Function CreateIcon() As Image



        Dim Icon As Image = Nothing



        If FOverrideBackground IsNot Nothing Then



            ' Override the background

            Select Case FOverrideBackground.Type



                Case Style.EBackgroundType.SolidColour

                    Icon = New Bitmap(ICON_HEIGHT, ICON_HEIGHT)

                    Graphics.FromImage(Icon).Clear(FOverrideBackground.Value)



                Case Style.EBackgroundType.Image

                    Icon = GetImageFromCache(FOverrideBackground.Value)



            End Select



        Else



            ' Use the background set in the style

            Select Case FStyle.BackgroundType



                Case Style.EBackgroundType.SolidColour

                    Icon = New Bitmap(ICON_HEIGHT, ICON_HEIGHT)

                    Graphics.FromImage(Icon).Clear(FStyle.DefaultBackgroundColour)



                Case Style.EBackgroundType.Image

                    Icon = GetImageFromCache(FStyle.DefaultBackgroundImage)



            End Select



        End If



        ' Return the icon

        Return Icon



    End Function



    Private Function GetImageFromCache(ByVal fileName As String) As Image



        ' Retrieve from the cache if possible otherwise load and resize the image

        Dim Result As Image = Nothing

        If FIconCache.ContainsImage(fileName) Then

            Result = FIconCache.GetImage(fileName)

        Else



            Try

                Result = GraphicRoutines.Resize(Image.FromFile(fileName), ICON_HEIGHT, ICON_HEIGHT)

                FIconCache.AddImage(fileName, Result)

            Catch



                ' Create an error image if the picture no longer exists on disk

                Result = New Bitmap(ICON_HEIGHT, ICON_HEIGHT, Imaging.PixelFormat.Format24bppRgb)

                Dim G As Graphics = Graphics.FromImage(Result)

                G.Clear(Color.Black)

                G.DrawString("IMAGE", SystemFonts.SmallCaptionFont, Brushes.White, 0, 0)

                G.DrawString("NOT", SystemFonts.SmallCaptionFont, Brushes.White, 0, 10)

                G.DrawString("FOUND", SystemFonts.SmallCaptionFont, Brushes.White, 0, 20)



            End Try

            Return Result



        End If

        Return Result



    End Function



End Class