Rename MainAxisAlignment to Spacing and CrossAxisAlignment to just
Alignment.
Drop the untyped Start, End, Center values and add them as Spacing
and Direction values. Center is both a Direction and Alignment, so
use the synonym "Middle" for the alignment.
Signed-off-by: Elias Naur <mail@eliasnaur.com>
Before this change, there was no guarantee that a PopOp matched
the intended PushOp. With a single stack operation, the client is
forced to match pop with the right push.
Signed-off-by: Elias Naur <mail@eliasnaur.com>
Move the Record and Stop methods from Ops to MacroOp itself.
Before this change, Ops.Stop stopped the recording of the most
recent macro, which could be a different macro than intended.
After this change, there is no such confusion.
As a bonus, the Ops API becomes less cluttered.
Signed-off-by: Elias Naur <mail@eliasnaur.com>
Rename Insets to the verb Inset for consistency with Align.
Uniform is a better description than Equal for the result of
UniformInset.
Signed-off-by: Elias Naur <mail@eliasnaur.com>
Exact was too special and can be expressed with RigidConstraints.
RigidConstraints is a better name ("rigid" was in the comment!)
Signed-off-by: Elias Naur <mail@eliasnaur.com>
Let the caller decide whether the constraints should be stretched.
Also unexport Constraint (not Constraints) methods, they weren't
pulling their weight.
Finally, don't force cross axis constraint minimum to 0 in List.
Signed-off-by: Elias Naur <mail@eliasnaur.com>
To keep the interface slim, remove the helper methods and shorten
the essential method, Pixels, to Px.
Add and use unexported Config implementation in the app package.
Signed-off-by: Elias Naur <mail@eliasnaur.com>
Layout objects are usually ephemereal, but when saved and re-used
between frames their measurements are not updated with varying pixel
density and font scaling.
Go back to storing unconverted ui.Values instead of raw pixels,
and convert them at each use.
Signed-off-by: Elias Naur <mail@eliasnaur.com>
Layouts and path builders are transient and need an ops list for
operation. However, instead of passing the ops list to every method,
pass the list in an init method and store it for subsequent methods.
Signed-off-by: Elias Naur <mail@eliasnaur.com>
We're about to allow OpBlock for invoking ops from multiple (cached)
Ops containers. To allow for drawing state changes to stick after
invoking such a cached block, we can't let OpBlock perform an implicit
save and restore of drawing state.
Instead, introduce OpPush and OpPop for explicit drawing state stack
management.
Signed-off-by: Elias Naur <mail@eliasnaur.com>
The layout package switched from interfaces to functions for
composing layouts. The switch made sure that no garbage is
generated for transient layouts such as Align, Inset, Stack, Flex.
Unfortunately, that left the stateful widgets and layouts: as soon
as their layout methods are embedded in a transient layout, a
closure is generated that escapes to the heap.
To avoid garbage for both transient as well as stateful widgets,
replace the functional approach with explicit begin/end methods.
A begin method generally starts an op block and returns the adjusted
constraints. An end method takes computed dimensions, ends its op
block and returns adjusted dimensions.
Signed-off-by: Elias Naur <mail@eliasnaur.com>
With layout.Widget a function instead of an interface, the amount
of per-frame garbage can be drastically reduced.
The layout code ends up slightly more explicit.
As a side benefit, the awkward ordering indexing for Flex and Stack
fit nicely into their new explicit Layout methods.
Signed-off-by: Elias Naur <mail@eliasnaur.com>
Elias Naur