DisplayFirstPage Method (GdViewer)
In This Topic
Displays the first page of the document currently loaded in the GdViewer control. You can use the
CurrentPage property to determine the currently displayed page.
The PageDisplayed and the PageChanged events, respectively the PreviewPageDisplayed and the PreviewPageChanged events, are raised after the page has been successfully displayed and changed.
Be aware that the SaveAnnotationsToPage method is called internally before each page change.
Syntax
Return Value
A member of the GdPictureStatus enumeration. If the method has been successfully followed, then the return value is GdPictureStatus.OK.
We strongly recommend always checking this status first.
Example
How to introduce the page browsing feature in your viewer.
'We assume that the GdViewer1 control has been properly integrated
'and your document has been properly displayed as well.
Enum Direction
FirstP
LastP
NextP
PreviousP
End Enum
Sub DoMove(ByVal MoveTo As Direction)
Dim status As GdPictureStatus = GdPictureStatus.OK
Select Case MoveTo
Case Direction.FirstP
status = GdViewer1.DisplayFirstPage()
Case Direction.LastP
status = GdViewer1.DisplayLastPage()
Case Direction.NextP
status = GdViewer1.DisplayNextPage()
Case Direction.PreviousP
status = GdViewer1.DisplayPreviousPage()
Case Else
End Select
If status <> GdPictureStatus.OK Then MessageBox.Show("Failure: " + status.ToString(), "GdViewer.DisplayFirstPage")
End Sub
//We assume that the GdViewer1 control has been properly integrated
//and your document has been properly displayed as well.
enum Direction { FirstP, LastP, NextP, PreviousP };
void DoMove(Direction MoveTo)
{
GdPictureStatus status = GdPictureStatus.OK;
switch (MoveTo)
{
case Direction.FirstP: status = GdViewer1.DisplayFirstPage(); break;
case Direction.LastP: status = GdViewer1.DisplayLastPage(); break;
case Direction.NextP: status = GdViewer1.DisplayNextPage(); break;
case Direction.PreviousP: status = GdViewer1.DisplayPreviousPage(); break;
default: break;
}
if (status != GdPictureStatus.OK) MessageBox.Show("Failure: " + status.ToString(), "GdViewer.DisplayFirstPage");
}
Example
How to introduce the page browsing feature in your viewer.
'We assume that the GdViewer1 control has been properly integrated
'and your document has been properly displayed as well.
Enum Direction
FirstP
LastP
NextP
PreviousP
End Enum
Sub DoMove(ByVal MoveTo As Direction)
Dim status As GdPictureStatus = GdPictureStatus.OK
Select Case MoveTo
Case Direction.FirstP
status = GdViewer1.DisplayFirstPage()
Case Direction.LastP
status = GdViewer1.DisplayLastPage()
Case Direction.NextP
status = GdViewer1.DisplayNextPage()
Case Direction.PreviousP
status = GdViewer1.DisplayPreviousPage()
Case Else
End Select
If status <> GdPictureStatus.OK Then MessageBox.Show("Failure: " + status.ToString(), "GdViewer.DisplayFirstPage")
End Sub
//We assume that the GdViewer1 control has been properly integrated
//and your document has been properly displayed as well.
enum Direction { FirstP, LastP, NextP, PreviousP };
void DoMove(Direction MoveTo)
{
GdPictureStatus status = GdPictureStatus.OK;
switch (MoveTo)
{
case Direction.FirstP: status = GdViewer1.DisplayFirstPage(); break;
case Direction.LastP: status = GdViewer1.DisplayLastPage(); break;
case Direction.NextP: status = GdViewer1.DisplayNextPage(); break;
case Direction.PreviousP: status = GdViewer1.DisplayPreviousPage(); break;
default: break;
}
if (status != GdPictureStatus.OK) MessageBox.Show("Failure: " + status.ToString(), "GdViewer.DisplayFirstPage");
}
See Also