pdfium - Patgames PDFium 使用键盘滚动

Question

我有点需要帮助。我正在尝试使用键盘在 Patagames PDFium .net 控件中滚动 PDF。不幸的是，我无法让它正确滚动，我正在寻找一些示例代码（VB 或 C#）来滚动“line wize（让我们说每个按键 10 个像素）”和“page wize”。有人可以帮我吗？TIA 很多。奥莱

Answer 1

没关系。找到了答案。

   Private Sub PdfViewer1_KeyDown(sender As Object, e As KeyEventArgs) Handles PdfViewer1.KeyDown

      Dim pageStep As Integer = PdfViewer1.AutoScrollMinSize.Height / PdfViewer1.Document.Pages.Count
      Dim lineStep As Integer = pageStep / 30
      Dim asp As Point = PdfViewer1.AutoScrollPosition


      Select Case e.KeyCode
         Case Keys.Up
            PdfViewer1.AutoScrollPosition = New Point(asp.X, -asp.Y - lineStep)
         Case Keys.Down
            PdfViewer1.AutoScrollPosition = New Point(asp.X, -asp.Y + lineStep)
         Case Keys.PageUp
            PdfViewer1.AutoScrollPosition = New Point(asp.X, -asp.Y - pageStep)
         Case Keys.PageDown
            PdfViewer1.AutoScrollPosition = New Point(asp.X, -asp.Y + pageStep)
      End Select

   End Sub