Hi Roland,

Thanks for responding to my question.

Since the app allows panning with the mouse to move the picture then I think it is a good alternative to scrolling functionality. 

Again, greatly appreciate all the responses and suggestions from you, Miguel and Chris on this issue.

Regards,

Tony

Hi Miguel,

Once again, thanks for taking your time to look into my issues.

In the sample apps, the vuo_photo_pic user object has the picture control so if somehow I can get the image to load into this control then the scrolling will work.

That's my dilemma. Roland's canvas application loads the image directly into the user object (vuo_photo in the sample app) so the scrolling doesn't work in this case.

I am hoping Roland can take a look at my sample app when he has a chance and modify the user object to use the picture control for display.

Thanks,

Tony

Hi Miguel and Roland,

Miguel - Follow your suggestion, in the sample application, I deleted all the codes inside the user events (H & V), the scroll works fine. Thank you.

Roland,

In your canvas application, I added  a picture control to the u_cst_picture. That way the image will be displayed inside the picture control and scrolling will work like in my sample application

However, I am running into issues when trying to load the image into the picture control. 

I was wondering if this is something simple you can help me with?

Thanks in advance.

Regards,

Tony

Lol,

The solution was easier than expected.

I've imported your sample application into PB2019 R3 (latest build) and it would also blow up after doing a single initial scroll.

The solution:

Delete all of the code in you h and -vscroll events and then run it. For me it works!!

Hi Roland,

Just curios, when you said "When I tried activating scrollbars to the picture control in my Canvas example, they don't do anything. No abort. This is PB 10.5 by the way."

Did you add the call to Send() in the scripts for the pbm_vscroll and pbm_hscroll user events?

For pbm_vscroll, Send(Handle(this), 277, scrollcode, scrollpos)

For pbm_hscroll, Send(Handle(this), 276, scrollcode, scrollpos)

The call crashes the application when moving the scrollbar controls.

Thanks,

Tony

Hi Roland,

Thanks for responding to my question.

The Send() function calls in the script for pbm_vscroll and pbm_hscroll user events crash the application in both PB2017R3 and PB2019R3.

To further test this out, I added the scroll bars to the window object and the application also crashes here as well.

Do you think this is a bug in PowerBuilder?

As far as your suggestion of calling of_MousePan(x,y) function to reposition the photo, I tried but did not seem to do much.

For example, for vertical scrolling, of_MousePan(0, scrollcode) and horizontal scrolling, of_MousePan(scrollcode, 0). 

Am I doing what you suggesting correctly? 

The reason I want to have the scrollbars enabled so user can see to the right and or bottom of the photo after they enlarge the picture.

Once again, thanks for taking a look at my issue.

Regards,

Tony

When I tried activating scrollbars to the picture control in my Canvas example, they don't do anything. No abort. This is PB 10.5 by the way.

You can move the picture with the mouse.

Maybe you can use hscroll and vscroll objects and use those to reposition by calling of_MousePan. The function is private so would need to be changed to public.

Hi Miguel,

Thanks for respond to my question.

Follow your suggestion, I created a sample app in PB2017R3 with just a window and a user object (adding scrollbars for H & V) with a picture control.

Running the app, one will see that it crashes as soon as moving the scrollbars up/down or left/right in the user object.

The zip file for the sample app is attached here. I would appreciate anyone can take a look at the source code and let me know what I am doing wrong.

Thanks in advance!

Tony

Hi Chris,

Thanks for respond to my question.

To troubleshoot the crash in the user object caused by H/V scrolling, I created a simple user object with just a picture control and added scrollbars for H and V. Running the application, it crashes as soon as I move the scrollbars up/down or left/right. So, it doesn't look like the send() function calls in the user events are working as I thought it would like the scrolling functionality in the datawindows.

Have you or anyone been successful in implement scrolling for user objects?

I attached the screen shots of my user object for your review.

I would appreciate any ideas/suggestions to make this work.

Thanks,

Tony

Hi Chris,

Thanks for sharing your past project with Passport Canada.

For my application, I added the horizontal and vertical scrollbar to the user object. I created user events using pbm_vscroll and pbm_hscroll event IDs.

For the scripts, I added the calls to Send(ih_hCanvas, 277, scrollcode, scrollpos) for vertical scrolling and Send(ih_hCanvas, 276, scrollcode, scrollpos) for the horizontal scrolling.

The application crashes as soon as I move the either the vertical or horizon scroll bar at runtime.

Do you have any idea what I am doing wrong? I am attaching screen shots to show the user object.

Thanks,

Tony

HI Tony ;

  FWIW: When I used  to do PB consulting with Passport Canada, I did all this passport photo work using either the native InkEdit or InkPicture controls with no need for special coding like Roland's approach. Also, if you use the InkPicture feature in a DataWindow object then it becomes fully Zoomable & Scrollable (food for thought).  ;-)

HTH

Regards ... Chris