08/02/2011, 11:28
|
| | | Fecha de Ingreso: julio-2010
Mensajes: 20
Antigüedad: 14 años, 4 meses Puntos: 0 | |
 Respuesta: referencia a objeto no establecida com instancia de un objeto,Proyecto Imp
no toma el listview para previzualizarlo
Código:
Dim vform2 As PrintableListView.PrintableListView
*Private Sub m_btnPageSetup_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles m_btnPageSetup.Click
* * * * * * vform2 = new PrintableListView.PrintableListView
* * * * * * vform2.PageSetup()
* * * * End Sub
Código:
Public Class PrintableListView
Inherits ListView
Private Function GetItem(ByVal index As Integer) As ListViewItem
Return If(Me.m_bPrintSel, MyBase.SelectedItems.Item(index), MyBase.Items.Item(index))
End Function
Private Sub OnBeginPrint(ByVal sender As Object, ByVal e As PrintEventArgs)
Me.PreparePrint
End Sub
Private Sub OnPrintPage(ByVal sender As Object, ByVal e As PrintPageEventArgs)
Dim nNumItems As Integer = Me.GetItemsCount
If ((nNumItems = 0) OrElse (Me.m_nStartRow >= nNumItems)) Then
e.HasMorePages = False
Else
Dim rectFull As RectangleF
Dim ch As ColumnHeader
Dim sf As StringFormat
Dim rectText As RectangleF
Dim nNextStartCol As Integer = 0
Dim x As Single = 0!
Dim y As Single = 0!
Dim cx As Single = 4!
Dim fScale As Single = 1!
Dim fRowHeight As Single = 0!
Dim fColWidth As Single = 0!
Dim bUnprintable As Boolean = False
Dim g As Graphics = e.Graphics
If (g.VisibleClipBounds.X < 0!) Then
rectFull = e.MarginBounds
rectFull = New RectangleF(((rectFull.X / Me.m_fDpi) * 100!), ((rectFull.Y / Me.m_fDpi) * 100!), ((rectFull.Width / Me.m_fDpi) * 100!), ((rectFull.Height / Me.m_fDpi) * 100!))
Else
rectFull = New RectangleF((e.MarginBounds.Left - ((e.PageBounds.Width - g.VisibleClipBounds.Width) / 2!)), (e.MarginBounds.Top - ((e.PageBounds.Height - g.VisibleClipBounds.Height) / 2!)), CSng(e.MarginBounds.Width), CSng(e.MarginBounds.Height))
End If
Dim rectBody As RectangleF = RectangleF.Inflate(rectFull, 0!, (-2! * Me.Font.GetHeight(g)))
Dim sfmt As New StringFormat
sfmt.Alignment = StringAlignment.Center
g.DrawString(Me.m_strTitle, Me.Font, Brushes.Black, rectFull, sfmt)
sfmt.LineAlignment = StringAlignment.Far
g.DrawString(("Page " & Me.m_nPageNumber), Me.Font, Brushes.Black, rectFull, sfmt)
If (((Me.m_nStartCol = 0) AndAlso Me.m_bFitToPage) AndAlso (Me.m_fListWidth > rectBody.Width)) Then
fScale = (rectBody.Width / Me.m_fListWidth)
End If
rectFull = New RectangleF((rectFull.X / fScale), (rectFull.Y / fScale), (rectFull.Width / fScale), (rectFull.Height / fScale))
rectBody = New RectangleF((rectBody.X / fScale), (rectBody.Y / fScale), (rectBody.Width / fScale), (rectBody.Height / fScale))
g.ScaleTransform(fScale, fScale)
g.PageUnit = GraphicsUnit.Inch
g.PageScale = 0.01!
nNextStartCol = 0
y = rectBody.Top
Dim brushHeader As Brush = New SolidBrush(Color.LightGray)
Dim fontHeader As New Font(Me.Font, FontStyle.Bold)
fRowHeight = (fontHeader.GetHeight(g) * 3!)
x = rectBody.Left
Dim i As Integer = Me.m_nStartCol
Do While (i < MyBase.Columns.Count)
ch = MyBase.Columns.Item(i)
fColWidth = Me.m_arColsWidth(i)
If ((x + fColWidth) <= rectBody.Right) Then
g.FillRectangle(brushHeader, x, y, fColWidth, fRowHeight)
g.DrawRectangle(Pens.Black, x, y, fColWidth, fRowHeight)
sf = New StringFormat
If (ch.TextAlign = HorizontalAlignment.Left) Then
sf.Alignment = StringAlignment.Near
ElseIf (ch.TextAlign = HorizontalAlignment.Center) Then
sf.Alignment = StringAlignment.Center
Else
sf.Alignment = StringAlignment.Far
End If
sf.LineAlignment = StringAlignment.Center
sf.FormatFlags = StringFormatFlags.NoWrap
sf.Trimming = StringTrimming.EllipsisCharacter
rectText = New RectangleF((x + cx), y, ((fColWidth - 1!) - (2! * cx)), fRowHeight)
g.DrawString(ch.Text, fontHeader, Brushes.Black, rectText, sf)
x = (x + fColWidth)
Else
If (i = Me.m_nStartCol) Then
bUnprintable = True
End If
nNextStartCol = i
Exit Do
End If
i += 1
Loop
y = (y + fRowHeight)
Dim nRow As Integer = Me.m_nStartRow
Dim bEndOfPage As Boolean = False
Do While (Not bEndOfPage AndAlso (nRow < nNumItems))
Dim item As ListViewItem = Me.GetItem(nRow)
fRowHeight = (((CSng(item.Bounds.Height) / Me.m_fDpi) * 100!) + 5!)
If ((y + fRowHeight) > rectBody.Bottom) Then
bEndOfPage = True
Else
x = rectBody.Left
For i = Me.m_nStartCol To MyBase.Columns.Count - 1
ch = MyBase.Columns.Item(i)
fColWidth = Me.m_arColsWidth(i)
If ((x + fColWidth) <= rectBody.Right) Then
g.DrawRectangle(Pens.Black, x, y, fColWidth, fRowHeight)
sf = New StringFormat
If (ch.TextAlign = HorizontalAlignment.Left) Then
sf.Alignment = StringAlignment.Near
ElseIf (ch.TextAlign = HorizontalAlignment.Center) Then
sf.Alignment = StringAlignment.Center
Else
sf.Alignment = StringAlignment.Far
End If
sf.LineAlignment = StringAlignment.Center
sf.FormatFlags = StringFormatFlags.NoWrap
sf.Trimming = StringTrimming.EllipsisCharacter
Dim strText As String = If((i = 0), item.Text, item.SubItems.Item(i).Text)
Dim font As Font = If((i = 0), item.Font, item.SubItems.Item(i).Font)
rectText = New RectangleF((x + cx), y, ((fColWidth - 1!) - (2! * cx)), fRowHeight)
g.DrawString(strText, font, Brushes.Black, rectText, sf)
x = (x + fColWidth)
Else
nNextStartCol = i
Exit For
End If
Next i
y = (y + fRowHeight)
nRow += 1
End If
Loop
If (nNextStartCol = 0) Then
Me.m_nStartRow = nRow
End If
Me.m_nStartCol = nNextStartCol
Me.m_nPageNumber += 1
e.HasMorePages = (((Not bUnprintable AndAlso (Me.m_nStartRow > 0)) AndAlso (Me.m_nStartRow < nNumItems)) OrElse (Me.m_nStartCol > 0))
If Not e.HasMorePages Then
Me.m_nPageNumber = 1
Me.m_nStartRow = 0
Me.m_nStartCol = 0
End If
brushHeader.Dispose
End If
End Sub
Private Sub PreparePrint()
Me.m_fListWidth = 0!
Me.m_arColsWidth = New Single(MyBase.Columns.Count - 1) {}
Dim g As Graphics = MyBase.CreateGraphics
Me.m_fDpi = g.DpiX
g.Dispose
Dim i As Integer
For i = 0 To MyBase.Columns.Count - 1
Dim ch As ColumnHeader = MyBase.Columns.Item(i)
Dim fWidth As Single = (((CSng(ch.Width) / Me.m_fDpi) * 100!) + 1!)
Me.m_fListWidth = (Me.m_fListWidth + fWidth)
Me.m_arColsWidth(i) = fWidth
Next i
Me.m_fListWidth += 1
End Sub
Public Sub PrintPreview()
Me.m_printDoc.DocumentName = "Documentos Asociados al Cómite Paritario"
Me.m_nPageNumber = 1
Me.m_bPrintSel = False
Me.m_previewDlg.ShowDialog(Me)
End Sub
' Properties
Public Property FitToPage As Boolean
Get
Return Me.m_bFitToPage
End Get
Set(ByVal value As Boolean)
Me.m_bFitToPage = value
End Set
End Property
Public m_bPrintSel As Boolean = False
Public m_previewDlg As PrintPreviewDialog = New PrintPreviewDialog
Public m_printDlg As PrintDialog = New PrintDialog
Public m_printDoc As PrintDocument = New PrintDocument
Public m_setupDlg As PageSetupDialog = New PageSetupDialog
Public m_strTitle As String = ""
End Class
Última edición por matarasky; 08/02/2011 a las 12:16 |
. Saludos! 
