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Add support for recursive dependency tracking across PropertyTracker instances

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By default PropertyTracker::evaluate() registers the currently
evaluating binding/tracker as a dependency. This should help with
repeaters and other scenarios where in the run-time we use property
trackers but want to track the overall "dirtyness" in the window with
regards to whether a redraw is needed or not.

The new evaluate_as_dependency_root() function allows skipping this
mechanism and is used for the two trackers in the window.
This commit is contained in:
Simon Hausmann 2021-03-24 13:51:23 +01:00
parent e63baa5766
commit 3bd5b0eadf
5 changed files with 115 additions and 16 deletions
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22
api/sixtyfps-cpp/tests/datastructures.cpp
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@ -42,3 +42,25 @@ TEST_CASE("Basic SharedVector API", "[vector]")
REQUIRE(vec[2] == 10);
}
}
TEST_CASE("Property Tracker")
{
using namespace sixtyfps;
PropertyTracker tracker1;
PropertyTracker tracker2;
Property<int> prop(42);
auto r = tracker1.evaluate([&]() { return tracker2.evaluate([&]() { return prop.get(); }); });
REQUIRE(r == 42);
prop.set(1);
REQUIRE(tracker2.is_dirty());
REQUIRE(tracker1.is_dirty());
r = tracker1.evaluate(
[&]() { return tracker2.evaluate_as_dependency_root([&]() { return prop.get(); }); });
REQUIRE(r == 1);
prop.set(100);
REQUIRE(tracker2.is_dirty());
REQUIRE(!tracker1.is_dirty());
}