From a10023ae7fdd8f52ed62d07ff3b93a67884bfa49 Mon Sep 17 00:00:00 2001
From: hi80482 <66435094+hi80482@users.noreply.github.com>
Date: Thu, 30 Jul 2020 02:58:18 +0800
Subject: [PATCH] add loop scroll

---
 .../95_Music Player/music_lib_list_page.py    | 52 +++++++++++++++++++
 1 file changed, 52 insertions(+)

diff --git a/Menu/GameShell/95_Music Player/music_lib_list_page.py b/Menu/GameShell/95_Music Player/music_lib_list_page.py
index 2af0ca5..1f9ebe1 100644
--- a/Menu/GameShell/95_Music Player/music_lib_list_page.py	
+++ b/Menu/GameShell/95_Music Player/music_lib_list_page.py	
@@ -94,6 +94,8 @@ class MusicLibListPage(Page):
     _BGheight = 70
 
     _Backspace = False
+
+    _ItemsPerPage = 6
     
     def __init__(self):
         Page.__init__(self)
@@ -102,7 +104,57 @@ class MusicLibListPage(Page):
         self._MyList = []
         self._SwapMyList = []
         self._MyStack = MusicLibStack()
+
+    def ScrollUp(self):
+        if len(self._MyList) <= 1:
+            return
         
+        tmp = self._PsIndex
+        self._PsIndex -= self._ScrollStep
+        
+        if self._PsIndex < 0:
+            self._PsIndex = len(self._MyList) - 1   # to end
+
+        dy = abs(tmp - self._PsIndex)
+        cur_li = self._MyList[self._PsIndex]
+        if cur_li._PosY < 0:
+            for i in range(0, len(self._MyList)):
+                self._MyList[i]._PosY += self._MyList[i]._Height * dy
+
+        # loop scroll, to end
+        if self._PsIndex == len(self._MyList) - 1:
+            # check items per page
+            if len(self._MyList) > self._ItemsPerPage:
+                self._ItemsPerPage -= 1                 # not include current item
+                for i in range(0, len(self._MyList)):
+                    self._MyList[i]._PosY -= self._MyList[i]._Height * (dy - self._ItemsPerPage)
+            self._ItemsPerPage = 6                      # reset to 6
+
+    def ScrollDown(self):
+        if len(self._MyList) <= 1:
+            return
+
+        tmp = self._PsIndex
+        self._PsIndex +=self._ScrollStep
+
+        if self._PsIndex >= len(self._MyList):
+            self._PsIndex = 0   # to first
+
+        dy = abs(self._PsIndex - tmp)
+        cur_li = self._MyList[self._PsIndex]
+        if cur_li._PosY + cur_li._Height > self._Height:
+            for i in range(0,len(self._MyList)):
+                self._MyList[i]._PosY -= self._MyList[i]._Height * dy
+
+        # loop scroll, to first
+        if self._PsIndex == 0:
+            # check items per page
+            if len(self._MyList) > self._ItemsPerPage:
+                self._ItemsPerPage -= 1                 # not include current item
+                for i in range(0, len(self._MyList)):
+                    self._MyList[i]._PosY += self._MyList[i]._Height * (dy - self._ItemsPerPage)
+            self._ItemsPerPage = 6                      # reset to 6
+
     def SyncList(self,path):
         if myvars.Poller == None:
             return