686514 - Ctrl-plus and Ctrl-minus should scale directly-viewed images even when otherwise using "zoom text only"

Status: RESOLVED FIXED

(Core :: General, enhancement)

Description

[Josh Triplett]

(Not sure if I've found the right component for this bug.)

I have whole-page zooming / image scaling disabled, so that ctrl-plus and ctrl-minus just change the text size.  (I prefer to see larger text in the same layout, and I don't like the appearance of scaled images.)  However, this means that when I view an image directly (not as part of an HTML page), I can't scale that image.  When viewing an image directly, I'd like the usual zoom keystrokes to actually zoom the image, even though I normally use "zoom text only".

Comment 1

[mjh563]

But surely the "zoom text only" option by definition only zooms text?

You can resize images using the Image Zoom add-on, if that's any help:
https://addons.mozilla.org/en-US/firefox/addon/image-zoom/

Comment 2

[Josh Triplett]

"Zoom Text Only" only makes sense in the context of a page which can potentially contain both text and images.  When viewing an image directly, which interpretation makes more sense and provides more useful functionality: "do absolutely nothing" or "zoom the image"?

Comment 3

[Mats Palmgren (inactive)]

I think the suggested change makes sense for image documents.
Should be an easy fix.

Comment 4

[nattofriends]

Hi,

I'm interested in trying to fix this bug. Would you mind telling me which files or classes should I start looking in?

Comment 5

[Josh Matthews [:jdm]]

I believe the relevant file is http://mxr.mozilla.org/mozilla-central/source/toolkit/content/viewZoomOverlay.js#91, and perhaps http://mxr.mozilla.org/mozilla-central/source/content/events/src/nsEventStateManager.cpp#2517 as well.

Comment 6

[nattofriends]

Attachment: Patch

Comment 7

[Josh Matthews [:jdm]]

Comment on attachment 573752 [details] [diff] [review]
Patch

Nice work! I think Gavin is a reasonable review for this.

Comment 8

[nattofriends]

review ping?

Comment 9

[Mats Palmgren (inactive)]

Comment on attachment 573752 [details] [diff] [review]
Patch

I tested the patch on OSX, it works when zooming with keyboard commands
(CMD++/-) but not when using scroll zooming (CTRL+scroll).

Comment 10

[Josh Matthews [:jdm]]

Timothy, the second link I provided in comment 5 is where mouse zooming is handled.

Comment 11

[nattofriends]

Attachment: Patch

In order to find whether the document is synthetic, I added a method to nsIDocument to get mIsSyntheticDocument. I know nsDocument::GetMozSyntheticDocument exists, but it makes sense for a getter to be in nsIDocument (https://bugzilla.mozilla.org/show_bug.cgi?id=462892#c16), so I'm not too sure why that's implemented in nsDocument and not nsIDocument...

Comment 12

[nattofriends]

review ping?

Comment 13

[:Gavin Sharp [email: [e-mail]]]

Thanks for the patch, Timothy, and sorry for the delay in responding. One thing that would help in the future is making sure that your .hgrc has the "[diff]" options from https://developer.mozilla.org/en/Mercurial_FAQ#How_can_I_generate_a_patch_for_somebody_else_to_check-in_for_me.3F , just so that the generated diffs have a bit more context.

I noticed one issue with the patch as-is: it makes the View->Zoom->"Zoom Text Only" menu option not function properly on synthetic documents (you can toggle it but it doesn't have any effect on zooming behavior). I think ideally we would disable the menu option on such pages, by having FullZoom.updateMenu (defined in browser-fullZoom.js) check gBrowser.contentDocument.mozSyntheticDocument and set disabled accordingly.

Comment 14

[:Gavin Sharp [email: [e-mail]]]

Hmm, though actually, I guess it might be weird for a global toggle to be enabled/disabled based on the the current page. Maybe it's best to just leave the patch as-is.

Comment 15

[:Gavin Sharp [email: [e-mail]]]

Comment on attachment 575104 [details] [diff] [review]
Patch

Please also get review from a DOM peer on the content/ changes.

Comment 16

[Jonas Sicking (:sicking) No longer reading bugmail consistently]

Comment on attachment 575104 [details] [diff] [review]
Patch

Review of attachment 575104 [details] [diff] [review]:
-----------------------------------------------------------------

r=me on the content/ changes.

Comment 17

[Josh Matthews [:jdm]]

http://hg.mozilla.org/integration/mozilla-inbound/rev/043c16767e33

Thanks for the patch, Timothy! Sorry it took so long from start to finish.

Comment 18

[Matt Brubeck (:mbrubeck)]

https://hg.mozilla.org/mozilla-central/rev/043c16767e33