With transforms in the mix, checking if the coordinate is inside the
widget "allocation" makes even less sense. Just use gtk_widget_pick()
and walk up until we find a GtkFlowBoxChild.
This is the same as the old code since the transformation only contains
teh offset right now, but it will be different later where arbitrary
transformations are possible per widget.
The transform matrix is a translation matrix from the parent's origin to
the widget origin. We will later allow more transformations than just
translations.
Instead of style + rect_of_one_box, pass the new GtkCssBoxes object.
This has the nice side effect that when drawing background + border +
outline, we only compute all the boxes we need once.
Previously, those numbers stored the values relative to the margin box
of the widget. Now they store values relative to the content box,
thereby getting rid of the last remains of weird coordinate systems.
Split out the code for computing CSS boxes from given variables from the
background render code. This way, it can be shared between different
codebases.
Also, make that code completely be contained of static inline functions.
That ensures that it can be 100% inlined in cases where only parts of
the rectangle are needed (like in gtk_widget_get_width() in the future).
This will require some more patches to actually work, but those will
follow.
This way, we can compare with literally the previous allocation and the
size will not be influenced by an adjusted allocation.
But more importantly, we can now use the transform/width/height values
for other stuff.
It's not priv->transform (to be turned into a graphene matrix),
priv->width and priv->height.
The numbers are still the same.
The only difference is that unallocated widgets will now have x/y set to
0, not to -1.
Make items-changed never emit 2 signals, instead, always emit only one,
potentially by extending the range reported in items-changed.
And be a lot more exhaustive about autoselect tests.
1. Do not make position an inout variable
The function is meant to return a range for a given position, not modify
a position. So it makes no conceptual sense to use an inout variable.
2. Pass the selected state as an out variable
Using a boolean return value - in particular in an interface full of
boolean return values - makes the return value intuitively feel like a
success/failure return. Using an out variable clarifies the usage.
3. Allow passing every position value
Define what happens when position >= list.n_items
4. Clarify the docs about how this function should behave
In particular, mention the case from point (3)
5. Add more tests
Again, (3) needs testing.
We need to remove the weak pointer, as the stack switcher can
keep the list model alive beyond the stack. This was observed
to cause crashes:
==16870== Invalid write of size 8
==16870== at 0x5168A4E: g_nullify_pointer (gutils.c:2284)
==16870== by 0x522C500: weak_refs_notify (gobject.c:2791)
==16870== by 0x50FE7BC: g_data_set_internal (gdataset.c:407)
==16870== by 0x50FECA7: g_datalist_id_set_data_full (gdataset.c:670)
==16870== by 0x5227EB4: g_object_real_dispose (gobject.c:1056)
==16870== by 0x522D295: g_object_unref (gobject.c:3309)
==16870== by 0x4AF849F: unset_stack (gtkstackswitcher.c:428)
==16870== by 0x4AF892E: gtk_stack_switcher_dispose (gtkstackswitcher.c:527)
Ironically, these properties are too good - they always
give you a proper value, which is unfortunately different
from the declared default value, which is NULL. So, don't
check these.
It is easy to emit wrong ::selection-changed signals,
and then bad things will usually happen later. Add
some sanity checks to gtk_selection_model_selection_changed
to make this easier to track down.
