Cannot scroll with Synaptics touchpad

[jphilipp]

Hi,

with a Synaptics touchpad I cannot scroll through pages, if I use PDF-XChange Viewer as ActiveX plugin. If I start PDFXCview.exe directly, then the scroll gesture works. With the mouse wheel of an external mouse it works in both cases.

I tried it with your demo application OpenDocument.exe too, but scrolling with touchpad doesn't works.

Is there a solution for this?

Regards,
Jörg.

[Stefan - PDF-XChange]

Hello Jorg!

Please make sure that the SDK is the latest build (195) - you can check this in the information for e.g. the dll files provided with it, as if you are using an older build of the SDK this is what could be causing the problem.

Best,
Stefan

[jphilipp]

Hi Stefan,

tried it with the lastest build 195 too. The same problem.

I think, the Synaptics driver doesn't send mouse wheel events, but simulates mouse click events on the scrollbar buttons.

Regards,
Jörg.

[Stefan - PDF-XChange]

Hello jphilipp,

Only the guys in Synaptics will know how the driver works exactly, but in any case - have you disabled/hidden the scroll bars in the Viewer AX in your application and is this the reason you think the synapsis driver is not behaving properly?

Best,
Stefan

[jphilipp]

Hello Stefan,

no, I haven't disabled the scrollbar. And in your demo OpenDocument.exe the scrollbar is enabled too.

In another application without PdfXC plugin I have written a mouse wheel handler (with Delphi OnMouseWheel event). So I could see, that the touchpad driver doesn't send mouse wheel events. But all applications, scrollable windows and controls I tested work with the Synaptics driver, only the PdfXC plugin doesn't.

Regards,
Jörg.

[Vasyl - PDF-XChange]

Hi, Jörg.

Check one moment please: in our demo enable any non-Hand tool ("Shapshot" tool for example) and try mouse wheel. What is result?

Best
Regards.

[jphilipp]

Hello Vasyl,

I tried it with the Select and Zoom tools, but scrolling with touchpad doesn't work. Cannot find the Shapshot tool in the context menu.

Regards,
Jörg.

[Stefan - PDF-XChange]

Hello Jörg,

Vasyl made a typo - it should have been the "Snapshot tool" - which is between the hand and the text select tools.

Best,
Stefan

[Vasyl - PDF-XChange]

Hi, Jörg.

The "Select" or "Zoom" tool are also suitable.

Strange. We cannot reproduce this issue.
Will investigate it...

Best
Regards.

[jphilipp]

Hi Vasyl and Stefan,

I explored the OpenDocument.exe with WinSight32 from Borland (see screenshot): The window with classname "DSUI:DocView" and the subwindow "DSUI:PagesView" receive WM_VSCROLL (0x115) SB_LINEUP/DOWN events. But the PDF doesn't scroll

Regards,
Jörg.

[jphilipp]

The screenshot for PagesView...

[Vasyl - PDF-XChange]

Hi,

We have modified our PDFXCview.exe COM-server. As a test - please replace your existing (create backup first) PDFXCview.exe file and use the one in the attached archive and try to reproduce the bug.

For Info: the changed server edition contains text to indicate it is a test version : see "[SPECIAL]" in the 'About' Dialog.

Please advise us of the results of this test..

Best
Regards.

[jphilipp]

Hi Vasyl and Stefan,

it works, I can scroll with the touchpad

Thank you very much.

Best regards,
Jörg.

[Paul - PDF-XChange]

HI jphilipp,

thanks for the feedback. I'll be sure to pass on your thanks to the project team...