Base: move Files

Base/ScreenEx.vb

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+Imports System
+Imports System.Drawing
+Imports System.Runtime.InteropServices
+Imports System.Windows.Forms
+Imports DigitalData.Modules.Base.NativeMethods
+
+Public Class ScreenEx
+    Public Const DEFAULT_WINDOW_HEIGHT = 480
+    Public Const DEFAULT_WINDOW_WIDTH = 640
+
+    Friend Const MONITORINFOF_PRIMARY As Integer = &H1
+    Friend Const MONITOR_DEFAULTTONEAREST As Integer = &H2
+    Friend Const MONITOR_DEFAULTTONULL As Integer = &H0
+    Friend Const MONITOR_DEFAULTTOPRIMARY As Integer = &H1
+
+    Friend Enum Monitor_DPI_Type As Integer
+        MDT_Effective_DPI = 0
+        MDT_Angular_DPI = 1
+        MDT_Raw_DPI = 2
+        MDT_Default = MDT_Effective_DPI
+    End Enum
+
+    Private Enum DeviceCap
+        VERTRES = 10
+        DESKTOPVERTRES = 117
+    End Enum
+
+    Public Shared Function GetLocationWithinScreen(pLocation As Point) As Point?
+        For Each screen As Screen In Screen.AllScreens
+            If screen.Bounds.Contains(pLocation) Then
+                Return New Point(pLocation.X - screen.Bounds.Left, pLocation.Y - screen.Bounds.Top)
+            End If
+        Next
+
+        Return Nothing
+    End Function
+
+    Public Shared Sub RestoreFormPosition(pForm As Form, pPosition As Point)
+        Dim oLocationWithinScreen As Point? = GetLocationWithinScreen(pPosition)
+
+        If oLocationWithinScreen Is Nothing Then
+            Dim oPrimaryScreen = Screen.PrimaryScreen
+            pForm.StartPosition = FormStartPosition.CenterScreen
+        Else
+            pForm.StartPosition = FormStartPosition.Manual
+            pForm.Location = pPosition
+        End If
+    End Sub
+
+    Public Shared Sub RestoreFormState(pForm As Form, pFormState As FormWindowState)
+        If pFormState = FormWindowState.Maximized Then
+            pForm.WindowState = FormWindowState.Normal
+            pForm.WindowState = FormWindowState.Maximized
+        ElseIf pFormState = FormWindowState.Minimized Then
+            pForm.WindowState = FormWindowState.Normal
+            pForm.WindowState = FormWindowState.Minimized
+        Else
+            pForm.WindowState = FormWindowState.Normal
+        End If
+    End Sub
+
+    Public Shared Sub RestoreFormState(pForm As Form, pFormState As String)
+        Dim oFormState As FormWindowState
+        If Not [Enum].TryParse(pFormState, oFormState) Then
+            oFormState = FormWindowState.Normal
+        End If
+
+        RestoreFormState(pForm, oFormState)
+    End Sub
+
+    Public Shared Sub RestoreFormSize(pForm As Form, pFormSize As Size)
+        Dim oFormSize As Size
+        If pFormSize.Height < 1 Or pFormSize.Width < 1 Or pFormSize.IsEmpty Then
+            oFormSize = New Size(DEFAULT_WINDOW_WIDTH, DEFAULT_WINDOW_HEIGHT)
+        Else
+            oFormSize = pFormSize
+        End If
+
+        pForm.Size = oFormSize
+    End Sub
+
+    ''' <summary>
+    ''' Checks if a point is Visible on any screen
+    ''' </summary>
+    Public Shared Function IsVisibleOnAnyScreen(Location As Point) As Boolean
+        Try
+            Dim oRect As New Rectangle(Location, New Size(0, 0))
+
+            For Each oScreen In Screen.AllScreens
+                If oScreen.WorkingArea.IntersectsWith(oRect) Then
+                    Return True
+                End If
+            Next
+
+            Return False
+        Catch ex As Exception
+            Return False
+        End Try
+    End Function
+
+    ''' <summary>
+    ''' Checks if Size is not negative
+    ''' </summary>
+    Public Shared Function SizeIsVisible(Size As Size) As Boolean
+        If Size.Width >= 0 And Size.Height >= 0 Then
+            Return True
+        End If
+
+        Return False
+    End Function
+
+    ''' <summary>
+    ''' Checks if Location is not negative
+    ''' </summary>
+    Public Shared Function LocationIsVisible(Location As Point) As Boolean
+        If Location.X >= 0 And Location.Y >= 0 Then
+            Return True
+        End If
+
+        Return False
+    End Function
+
+    Public Function GetScreenScaling(Form As Form) As Single
+        Dim oHandle As IntPtr = Form.Handle
+        Dim oFactor1, oFactor2 As Single
+
+        oFactor1 = GetFactorFromDeviceCaps(oHandle)
+        oFactor2 = GetDPIFromMonitor(oHandle)
+
+        If oFactor1 > 1 Then
+            Return oFactor1
+        Else
+            Return oFactor2
+        End If
+    End Function
+
+    Private Function GetFactorFromDeviceCaps(Handle As IntPtr) As Single
+        Dim g As Graphics = Graphics.FromHwnd(Handle)
+        Dim desktop As IntPtr = g.GetHdc()
+        Dim LogicalScreenHeight As Integer = GetDeviceCaps(desktop, DeviceCap.VERTRES)
+        Dim PhysicalScreenHeight As Integer = GetDeviceCaps(desktop, DeviceCap.DESKTOPVERTRES)
+        Dim oScreenScalingFactor As Single = CSng(PhysicalScreenHeight) / CSng(LogicalScreenHeight)
+        Return oScreenScalingFactor
+    End Function
+
+    Private Function GetDPIFromMonitor(Handle As IntPtr) As Single
+        'Get handle to monitor that contains this window.
+        Dim monitorHandle As IntPtr = MonitorFromWindow(Handle, MONITOR_DEFAULTTONEAREST)
+
+        'Get DPI (If the OS is not Windows 8.1 or newer, calling GetDpiForMonitor will cause exception).
+        Dim dpiX As UInteger
+        Dim dpiY As UInteger
+
+        Dim result As Integer = GetDpiForMonitor(monitorHandle, Monitor_DPI_Type.MDT_Default, dpiX, dpiY)
+
+
+        If (result = 0) Then 'If S_OK (= 0)
+            Return dpiX / 96.0F
+        Else
+            Return -1
+        End If
+    End Function
+End Class