Added time manipulation functions to TimeRange and Timeline

src/TimeRange.cpp

@@ -32,6 +32,20 @@ void TimeRange::resize(time_type start, time_type end) {
 	resize(TimeRange(start, end));
 }
 
+void TimeRange::shift(time_type offset) {
+	start += offset;
+	end += offset;
+}
+
+void TimeRange::grow(time_type value) {
+	start -= value;
+	end += value;
+}
+
+void TimeRange::shrink(time_type value) {
+	grow(-value);
+}
+
 bool TimeRange::operator==(const TimeRange& rhs) const {
 	return start == rhs.start && end == rhs.end;
 }

src/TimeRange.h

@@ -18,6 +18,9 @@ public:
 
 	void resize(const TimeRange& newRange);
 	void resize(time_type start, time_type end);
+	void shift(time_type offset);
+	void grow(time_type value);
+	void shrink(time_type value);
 
 	bool operator==(const TimeRange& rhs) const;
 	bool operator!=(const TimeRange& rhs) const;

src/Timeline.h

@@ -191,6 +191,18 @@ public:
 		return reference(*this, time);
 	}
 
+	void shift(time_type offset) {
+		if (offset == time_type::zero()) return;
+
+		range.shift(offset);
+		set_type newElements;
+		for (Timed<T> element : elements) {
+			element.shift(offset);
+			newElements.insert(element);
+		}
+		elements = std::move(newElements);
+	}
+
 	Timeline(const Timeline&) = default;
 	Timeline(Timeline&&) = default;
 	Timeline& operator=(const Timeline&) = default;