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C++ ChangeTracker implementation

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This commit is contained in:
Olivier Goffart 2024-05-01 10:18:25 +02:00
parent cadcd4caf4
commit 80f37a3acf
5 changed files with 179 additions and 19 deletions
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41
api/cpp/include/slint_properties.h
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@ -7,6 +7,10 @@
namespace slint::cbindgen_private {
struct PropertyAnimation;
struct ChangeTracker
{
void *inner;
};
}
#include "slint_properties_internal.h"
@ -293,4 +297,41 @@ private:
cbindgen_private::PropertyTrackerOpaque inner;
};
struct ChangeTracker
{
ChangeTracker() { cbindgen_private::slint_change_tracker_construct(&inner); }
~ChangeTracker() { cbindgen_private::slint_change_tracker_drop(&inner); }
template<typename Data, typename FnEval, typename FnNotify>
void init(Data data, FnEval fn_eval, FnNotify fn_notify)
{
using Value = std::invoke_result_t<FnEval, Data>;
struct Inner
{
Data data;
FnEval fn_eval;
FnNotify fn_notify;
Value value;
};
auto data_ptr =
new Inner { std::move(data), std::move(fn_eval), std::move(fn_notify), Value() };
cbindgen_private::slint_change_tracker_init(
&inner, data_ptr, [](void *d) { delete reinterpret_cast<Inner *>(d); },
[](void *d) {
auto inner = reinterpret_cast<Inner *>(d);
auto v = inner->fn_eval(inner->data);
bool r = v != inner->value;
inner->value = v;
return r;
},
[](void *d) {
auto inner = reinterpret_cast<Inner *>(d);
inner->fn_notify(inner->data, inner->value);
});
}
private:
cbindgen_private::ChangeTracker inner;
};
} // namespace slint::private_api