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Hi,
At the moment I am using Gtk to build a gui, and would like to add GtkUtilities for its added interactivity functions. I'm running into issues whenever I try to incorporate anything from GtkUtilities, however.

A very simple draw function (like below) works fine.

using  Gtk.ShortNames, Images, GtkUtilities
filepath = "image.tiff"
win = Window("image")
c = Canvas()
push!(win, c)
A = Images.load(filepath)

@guarded draw(c) do widget
    copy!(widget, A)
end

showall(win)

Adding, for example, guidata[c, :xview] into the draw function in any form, crashes julia. E.g.:

@guarded draw(c) do widget
    xview, yview = guidata[widget, :xview], guidata[widget, :yview]
    println(xview, yview)
   
    copy!(widget, A)
end

breaks the code.
Since guidata is critical for panzoom and other operations, I'm not able to use GtkUtilities the way I would like/it was meant to be used.
Is there something I'm obviously doing wrong here? I've tried following the julia_gui example as well as @timholy's youtube tutorial from a couple of years back about how to use panzoom, and haven't been able to improve my results.

I actually thought Immerse did not support pan/zoom until I saw Tim's YouTube video.

The problem is that GtkUtilities.jl is not properly masking for modifier keys that are considered "significant".

I had to replace:

keymatch(event, keydesc) = event.keyval == keydesc[1] && event.state == UInt32(keydesc[2])

With the following:

function gtk_accelerator_get_default_mod_mask()
	ccall((:gtk_accelerator_get_default_mod_mask,Gtk.libgtk),Cint,())
end

keymatch(event, keydesc) = event.keyval == keydesc[1] &&
	(event.state&gtk_accelerator_get_default_mod_mask()) == UInt32(keydesc[2])

Now, I can zoom even if my NumLock key is on... but similar masking would also be necessary on the mouse operations.

Comments

• I did not make a PR because my guess is that accelerator_get_default_mod_mask() should be in Gtk.jl - and someone that better understands the Gtk.jl naming convention should probably be adding it.
• Note that gtk_accelerator_set_default_mod_mask() is only supposed to be set at "application startup" - which I believe means it could potentially be stored as a const while "loading" Gtk.jl (Not sure how this would work out, though).

I've just realized that you've created a new release in February and changed the Project.toml afterwards to support v0.22 of Images.jl but haven't released a version since then.
Do you mind to release v1.0.4 for this? 😉

I am using Gtk.Shortnames and GtkUtilties in my gui, and this very simple example code doesn't work:

using  Gtk.ShortNames, Images, TestImages, GtkUtilities

A = testimage("lighthouse")

win = Window("image")
c = Canvas()
g = Grid(visible = true)
g[1,1] = c
push!(win, g)

@guarded draw(c) do widget
    copy!(widget, A)
end

showall(win)

This returns a blank window. If instead I remove mention of the grid and simply copy! to the canvas, then this returns what I expect (but doesn't allow me to populate a grid with various items). Is the problem with placing the image in the grid in the first place? Is there a way to do this successfully while still being able to use GtkUtilities's canvas-specific functions?

If i understand the setting in the demo correctly, this should enable

• button1 rubberband select -> works
• ctrl+wheel zoom in and out -> works
• if zoomed in, wheel pans up and down, with shift left and right

But somehow i miss panning with mouse (pointer)?

Moving this over from timholy/ProfileView.jl#43:

julia> FATAL ERROR: Gtk state corrupted by error thrown in a callback:
ERROR: Direction 3 not recognized
 in scrollpm at /Users/kfischer/.julia/v0.5/GtkUtilities/src/panzoom.jl:385
 in anonymous at /Users/kfischer/.julia/v0.5/GtkUtilities/src/panzoom.jl:354
 in mousescroll_cb at /Users/kfischer/.julia/v0.5/Gtk/src/events.jl:193
 in anonymous at /Users/kfischer/.julia/v0.5/Gtk/src/events.jl:2
 in g_sigatom at /Users/kfischer/.julia/v0.5/Gtk/src/GLib/signals.jl:166
 in gtk_main at /Users/kfischer/.julia/v0.5/Gtk/src/events.jl:1

This happens on a macbook with two-finger swipe.

I'm trying to use ProfileView on 0.5:

julia> using ProfileView
INFO: Precompiling module ProfileViewGtk...
ERROR: LoadError: LoadError: syntax: unexpected )
 in include_from_node1(::String) at ./loading.jl:426 (repeats 2 times)
 in macro expansion; at ./none:2 [inlined]
 in anonymous at ./<missing>:?
 in eval(::Module, ::Any) at ./boot.jl:234
 in process_options(::Base.JLOptions) at ./client.jl:239
 in _start() at ./client.jl:318
while loading /home/mauro/.julia/v0.5/GtkUtilities/src/panzoom.jl, in expression starting on line 61
while loading /home/mauro/.julia/v0.5/GtkUtilities/src/GtkUtilities.jl, in expression starting on line 43
ERROR: LoadError: Failed to precompile GtkUtilities to /home/mauro/.julia/lib/v0.5/GtkUtilities.ji
 in compilecache(::String) at ./loading.jl:505

I'll try and fix it...