Request: Previews should be zoomable / panable

[tannerhelland]

Request: Previews should be zoomable / panable

[tannerhelland]

I'm on the fence about this due to the enormous complexity (and limited benefit) involved, but 24860ac is a big step toward making it possible.

[tannerhelland]

Currently investigating this for inclusion in 5.6. I need to add some other universal preview features (such as color select via "dropper", which would make a whole bunch of tools more user-friendly), so I may as well tackle the changes all at once.

Biggest requirement for this feature will be a property in the preview that exposes the aspect ratio difference between the actual image and the preview. This is necessary for calculating things like "radius" accurately (e.g. for a blur radius of 10, if the image is shown at 50% zoom, the preview must be rendered with a blur radius of 5).

[tannerhelland]

This is a possibility for 6.2, pending a number of other blockers. I'm removing it from the main issue list until I decide to actually tackle it.

[tannerhelland]

Currently working on this. Though I may change my mind, I'm not currently allowing user-settable zoom in previews. Instead, the preview control is getting a toggle button for "fit image to preview box" or "keep 100% zoom + allow panning by mouse-drag".

Lots of nuances to doing this right, particularly when operating on a selection. Also it will require a new event for the preview control, which means revisiting every tool in the project. Yay! /s

It will be pretty sweet when done, though!!