Introduce `.cancel` event that is fired when the user sends EOF
in *non raw mode* renderings. The event `.line` now sends the
entire line (even if larger than the internal buffer) but requires
now an `Allocator`.
The end of the `.line` event received contents is highlighted by a trailing newline
(which cannot occur before, as that triggers the line event itself).
Add signal handler for SIGCONT which forces a `.resize` event that should re-draw the
contents after continuing a suspended application (i.e. ctrl+z followed by `fg`).
Setting the cursor with the `Direct` handler will cause the rendering
to halt at that point and leave the cursor at point.
Due to not enabling *raw mode* with the newly introduced `App.start`
configuration options corresponding inputs are only visible to `zterm`
once the input has been completed with a newline. With this it is not
necessary for the renderer to know nothing more than the width of the
terminal (which is implied through the `Container` sizes). Making it
very trivial to implement.
Handle inputs as per usual (which however is a bit weak, is it goes through
key by key and not the entire line), batch all events such that all events
are handled before the next frame is rendered. For this the `App.start`
function needs to become configurable, such that it changes the termios as
configured (hence it is currently all commented out for testing).
A corresponding example has been added, which is very minimalistic as of now,
but will add further functionality to test the corresponding workflow that is
usual in `zterm` such that it in the best case only a swap in the renderer to
switch from alternate mode drawing to direct drawing.
The renderer will provide `resize`, `reposition` and `minSize` (for
the `Scrollable` `Element`) with a read-only pointer to the model of
the application (similar to how it is already done for `handle` and
`content`). Every interface function now has the same data that it can
each use for implementing its corresponding task based on local and
shared variables through the element instance and model pointer.
The provided `std.Io` is used for running the input reading and the
rendering asynch. The user can provide their desired `std.Io`
implementation as they wish to use. The examples use `std.Io.Threaded`
as a simple threaded solution.
This should be the way it should be done all the time, such that you
are not rendering for every input, but instead handle all `App.Event`s
that happened between the last render and the current. This shares
similarities with the continuous event loops, which also batches
the events only with the exception that it instead blocks (see
`App.Queue.poll`).
Fix initial render to show scrollbar immediately if required. Show and
hide scrollbar correctly when content size or terminal size changes. Add
keybindings for scrolling similar to pager keybindings.
The union type can not be constructed with declarations anyway:
`error: reified unions must have no decls`; meaning there is no point in
even trying to do so.
Enforce that `minSize` returns a `Point` with corresponding minimal
dimensions with respect to the provided available size. This means that
an `Element` implementation that provides a `minSize` function may even
return a too small dimension, which would automatically be resized to be
at least as big as the provided size.
The minimal required size can the queried from the containing `Element`
of the `Container` that is provided to the `Scrollable` to dynamically
adjust its size.
Currently abritrary nesting is not supported / tested.
Now the `App` contains a state which is a user-defined `struct` which
is passed to the `handle` and `contents` callbacks for `Container`'s and
`Element`'s. Built-in `Element`'s shall not access the `App.Model` and
should therefore never cause any side-effects.
User-defined events shall be used to act as *messages* to cause
potential side-effects for the model. This is the reason why only
the `handle` callback has a non-const pointer to the `App.Model`. The
`contents` callback can only access the `App.Model` read-only to use for
generating the *view* (in context of the elm architecture).
yves-biener
