Some code like this was generated:
`if (*self->checkbox_31.get_checked()).get()`
the remove_parentheses function removed a parentheses that it shouldn't have removed
focus() is implemented by calling set_focus() on the window with the absolute item
index as a parameter. The
generate_item_indices pass generates local item indicies,
which need to made absolute.
Sadly there exists a gap in the item tree between the root element of a sub-component
and its children. Therefore each sub-component gets two members passed to the constructor,
the tree_index and tree_index_of_first_child.
The former is to be used when the local index is zero (indicates the root).
The latter is used as base for any children.
The variable in C++ sub-components is sometimes unused. We could try to lazily emit it, but
that requires more work and this is distracting :-). This silencing should hopefully also work for gcc.
This reverts commit fde3846392 because it
breaks the gcc build ("error: 'maybe_unused' attribute ignored
[-Werror=attributes]"). Will need a different solution that works for
clang (which warns about m_root_ being unused).
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.
Avoid creating an intermediate array of items to free the graphics resources.
Instead call run-time function with the item tree as a parameter, which is traversed.
It's practically the same data structure that was previously created, except
that it is shared/global and has little holes for the dynamic tree items, but those are easy to skip.
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.
