This original post was so poorly written, I’m rewriting it in the hopes of clarifying my question.
I have a
GtkBox subclass that defines its UI in a
GtkBuilder template. It’s widget hierarchy is roughly:
│ └── GtkOverlay
│ ├── GtkStack
│ │ ├── GtkStackPage
│ │ │ └── GtkPicture
│ │ └── GtkStackPage
│ │ └── GtkPicture
│ └── [overlay] GtkButton
It looks like this:
The contents of the
GtkPicture changes when a new image is downloaded. I’d like to fix the aspect ratio of the
GtkPicture to a constant value, so that whenever a new picture is set as the
GtkPicture’s paintable, it crops the image. I essentially want a fixed aspect ratio preview window, but I can’t figure out how to fix the size of the
GtkPicture (or a parent widget, if that’s the right way to go about doing this).
Currently, if the
GtkPicture is loaded with an image that has larger vertical size than horizontal size, the
GtkPicture scales up when I resize my window, looking something like this:
What is the right way to go about fixing the dimensions of a
GtkPicture so that it is a constant size?
As far as I know you probably want to use Gtk.Image. It is different to Gtk.Picture in that the size is defined by the application, and not the picture.
Gtk.Image is super fixed on size. That is even if the user resizes the window manually, it won’t scale with it. Maybe setting
can-shrink property to
content-fit property to
COVER can do the job.
This is what I’m working on. I think some combination of using a
GtkPicture and setting its paintable to a snapshot of a texture. I’ll be sure to share what I settle on when I figure it out.
OK, So, I tried a simple example with a
Gtk.Picture being the only child of a
Gtk.ApplicationWindow. Keeping everything the default and changing just the
file property of the picture doesn’t resize the window. The
Gdk.Paintable that was autogenerated by changing the
file property had its
STATIC_SIZE flag set. So, if whatever implementation of
Gtk.Paintable you are using has a way to set that flag, doing so might help. Otherwise, just use
Gio.File instead of
So I figured out that if I set the
height-request properties to:
int width = int.min (300, texture.get_intrinsic_width ());
int height = int.min (200, texture.get_intrinsic_height ());
Then I can realistically expect a smallish size preview image that sets the size of the
GtkPicture to exactly the size of the texture used as its
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