Calling init on sub-components with self_weak as argument only works after self_weak is
initialized, which happens in create(). So a new init() function for root components is called afterwards.
By accident the tree was still depth-first instead of level-order. This implementation works better,
by placing the root element of sub-components as
parents and the children into the children space later.
There's still more work to do to clean it up and make work with more complex scenarios.
When the use-site of a component tries to set a binding on a property that is an alias,
it might be that the alias was optimized away.
To avoid needeless recursion, this patch generates a mutable property getter
for declared properties (which takes care of alias redirection).
This also removes the use of root_item() because it's insufficient: If the property is custom (and/or an alias), then we need to use the getter,
otherwise we need to recurse.
So there are three cases:
```
MyButton {
text: "Ok";
}
```
If `MyButton` is `MyButton := Rectangle { property<string> text; }` then
we go through the mutable prop reference getter. This also works for aliases.
If it's `MyButton := Text { ... }` or (more complex) `L := Text {} MyButton := L {}` then
we recurse.
Traditionally the recursion is not needed because in public API the "inherited" properties
aren't expose. But since in the language they are exposed, we need to continue.
As a bonus this cleans up the property access code a little by re-using access_member.
* Forward declare the root component
* Pass it as a parameter to the constructor and save it as m_root pointer and use it to access globals
* Make the sub-components friends of the root component, in order to access the globals
* Delay binding initialization to an explicit init() call in sub-components
Provide a layout_info implementation for sub-components and call it. This
disables the lowering the implicit_layout_info call again,
also to ensure that when this
is installed from the use-site of the sub-component, the self can be used to obtain
the info (by calling the new generated function).
For the item index generation and the member population for the C++
structs, a level-order variant of `recurse_elem` is sufficient - as also
indicate by the unused item index parameters.
In the generator for producing the members of built-in items, repeaters
or sub-components, we don't need to traverse into sub-components. The
C++ compiler will take care of instantiating the fields of
sub-components after all.
For the item tree however we do need to recurse, so this change attempts
to do that. Repeaters are explicitly not handled yet though.
Instead of requiring inlining, assume that the generated code will provide an
implementation of layouting_info as well as root_item.
They're not implemented yet though.
Within sub-components we only know the local item index, and together with the
offset provided in the constructor we'll be able to
compute the correct index for items that's needed sometimes,
for example for focus setting.
The item indices are still wrong though, that'll need fixing in the corresponding pass.
Besides `is_global()` add `is_root_component` to Rc<Component>, so that
we can distinguish between the main component (that should have the full
API, etc.) and supplementary components.
This also avoids the generation of unnecessary members when inlining is
disabled.
The generation is still incomplete, but this change passes them to the C++ generator
when not inlining.
Another option would've been a "inline: bool", but that won't suffice in
the future when we may want to use heuristics to selectively inline some
and others not. And always taking used_types.sub_components is wrong
when inlining as those are ... inlined.
Similar to the parent commit, the model tracks changes to the rows and
marks an internal property dirty. Since we have a base class this is a
little less intrusive.
cc #98
Two problems:
- We were not marking the property as dirty, so dependent property would not
update themselves
- In the generated rust/c++ code, we would not call set_animated_value
This is a two-stage change, that first centralizes the file I/O code
path for on-disk and builtin:/ files. Secondly the resource embedding
pass now produces diagnostics if a file cannot be located.
For loading images that are included in the widget library that's included in turn
in the compiler binary, we need to create ImageInner::EmbeddedData
with &'static data and &'static file extension. The latter was
created using string interning, but we can also access the path of the
widget library data structure.
