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Diffstat (limited to 'src/mbgl/style/applied_class_properties.cpp')
| -rw-r--r-- | src/mbgl/style/applied_class_properties.cpp | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/src/mbgl/style/applied_class_properties.cpp b/src/mbgl/style/applied_class_properties.cpp new file mode 100644 index 0000000000..9037c6ad5d --- /dev/null +++ b/src/mbgl/style/applied_class_properties.cpp @@ -0,0 +1,52 @@ +#include <mbgl/style/applied_class_properties.hpp> + +namespace mbgl { + +AppliedClassProperty::AppliedClassProperty(ClassID class_id, timestamp begin_, timestamp end_, const PropertyValue &value_) + : name(class_id), + begin(begin_), + end(end_), + value(value_) {} + +// Returns thie ID of the most recent +ClassID AppliedClassProperties::mostRecent() const { + return properties.size() ? properties.back().name : ClassID::Fallback; +} + +void AppliedClassProperties::add(ClassID class_id, timestamp begin, timestamp end, const PropertyValue &value) { + properties.emplace_back(class_id, begin, end, value); +} + +bool AppliedClassProperties::hasTransitions() const { + return properties.size() > 1; +} + +// Erase all items in the property list that are before a completed transition. +// Then, if the only remaining property is a Fallback value, remove it too. +void AppliedClassProperties::cleanup(timestamp now) { + // Iterate backwards, but without using the rbegin/rend interface since we need forward + // iterators to use .erase(). + for (auto it = properties.end(), begin = properties.begin(); it != begin;) { + // If the property is finished, break iteration and delete all remaining items. + if ((--it)->end <= now) { + // Removes all items that precede the current iterator, but *not* the element currently + // pointed to by the iterator. This preserves the last completed transition as the + // first element in the property list. + properties.erase(begin, it); + + // Also erase the pivot element if it's a fallback value. This means we can remove the + // entire applied properties object as well, because we already have the fallback + // value set as the default. + if (it->name == ClassID::Fallback) { + properties.erase(it); + } + break; + } + } +} + +bool AppliedClassProperties::empty() const { + return properties.empty(); +} + +}
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