1 files changed, 35 insertions, 0 deletions
diff --git a/solo-tool-project/src/solo_tool/handlers.py b/solo-tool-project/src/solo_tool/handlers.py
new file mode 100644
index 0000000..0a4ee21
--- /dev/null
+++ b/solo-tool-project/src/solo_tool/handlers.py
@@ -0,0 +1,35 @@
+from collections.abc import Callable
+
+from solo_tool.solo_tool import SoloTool
+
+def changeSong(st: SoloTool, delta: int) -> Callable[[], None]:
+    def f():
+        if st.song is None:
+            st.song = 0
+        else:
+            st.song += delta
+    return f
+
+def seekRelative(st: SoloTool, delta: float) -> Callable[[], None]:
+    def f():
+        st.position += delta
+    return f
+
+def positionToKeyPoint(st: SoloTool) -> Callable[[], None]:
+    def f():
+        st.keyPoint = st.position
+    return f
+
+def changeKeyPoint(st: SoloTool, delta: int) -> Callable[[], None]:
+    from bisect import bisect_right, bisect_left
+    def f():
+        if delta > 0:
+            pivot = bisect_right(st.keyPoints, st.keyPoint) - 1
+        elif delta < 0:
+            pivot = bisect_left(st.keyPoints, st.keyPoint) - 1
+        else:
+            return
+        new = max(min(pivot + delta, len(st.keyPoints) - 1), 0)
+        st.keyPoint = st.keyPoints[new]
+    return f
+