ReDo / UnDo

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Hello, a new question...

In my program I often use the JavaScript statement (command)

Code: Select all

this.getPageBox("Crop", this.pageNum);

Why doesn't this command work after Undo action? Is there no CropBox at all in any of old states of a document?

[Stefan - PDF-XChange]

Hello Relapse,

We just discussed this with one of my colleagues, and he advised that this JS method should work, but using it after undo/redo could cause unpredictable results.
We will see if we can get some further info here.

Best,
Stefan

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The other option is to work with temporary files, then you'll have this CropBox for sure and you can e.g. crop a selected area from one of previous states. Since there is this function on the navigation bar, it would be easier to use this native one...

[Ivan - Tracker Software]

Can you let me know which operation is undoing? As I see on my side this js snippet always works.

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The operations I do are: cropping an area out of a document (after that action you see the cropped area as a new document), putting a border around a document (an annotation in form of a rectangle is created), scaling it. That's all.

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Now I'm trying to implement the functionality with the Memento pattern. The problem is, if I load a document having several pages and then cut out an area of it, I delete the rest of pages. How could I reverse deleting pages? How is that issue solved in your application programatically?


Thanx

[Vasyl - PDF-XChange]

Hi, relapse.

Sorry, it is impossible because the 'delete pages' operation is irreversible currently - you may only re-open document without saving.
But you will be able to undo it in the new version of this SDK - V3. Please wait..

Best
Regards.