{"action":"created","comment":{"url":"https://api.github.com/repos/mit-cml/appinventor-sources/pulls/comments/169834072","pull_request_review_id":98424072,"id":169834072,"diff_hunk":"@@ -25,10 +35,129 @@\n     \"scrollable.\",\n     category = ComponentCategory.LAYOUT)\n @SimpleObject\n-public class HorizontalScrollArrangement extends HVArrangement {\n+public class HorizontalScrollArrangement extends HVArrangement implements OnScrollChangedListener {\n+\n+  private int oldScrollX = 0;\n+\n   public HorizontalScrollArrangement(ComponentContainer container) {\n     super(container, ComponentConstants.LAYOUT_ORIENTATION_HORIZONTAL,\n       ComponentConstants.SCROLLABLE_ARRANGEMENT);\n+    getView().getViewTreeObserver().addOnScrollChangedListener(this);\n+  }\n+\n+  private int px2dx(int px) {\n+    return Math.round(px * container.$form().deviceDensity());\n+  }\n+\n+  private int dx2px(int dx) {\n+    return Math.round(dx / container.$form().deviceDensity());\n+  }\n+\n+  private HorizontalScrollView getScrollView() {\n+    return (HorizontalScrollView) getView();\n+  }\n+\n+  @Override\n+  public void onScrollChanged() {\n+    int scrollX = dx2px(getView().getScrollX());\n+    if (scrollX < 0) {\n+      scrollX = 0;\n+    }\n+    if (oldScrollX != scrollX) {\n+      ScrollChanged(scrollX);\n+      oldScrollX = scrollX;\n+    }\n+  }\n+\n+  @SimpleEvent(description = \"Notice that if blocks like \\\"ScrollBy\\\" is excuted, this event would be called\")\n+  public void ScrollChanged(int scrollPosition) {\n+    EventDispatcher.dispatchEvent(this, \"ScrollChanged\", scrollPosition);\n+    if (scrollPosition == 0) {\n+      ReachLeftEnd();\n+    } else {\n+      if (MaxScrollPosition() - ScrollPosition() <= 0) {\n+        ReachRightEnd();\n+      }\n+    }\n+  }\n+\n+  @SimpleEvent(description = \"Notice that if blocks like \\\"ScrollLeftEnd\\\" is excuted, this event would be called\")\n+  public void ReachLeftEnd() {\n+    EventDispatcher.dispatchEvent(this, \"ReachLeftEnd\");\n+  }\n+\n+  @SimpleEvent(description = \"Notice that if blocks like \\\"ScrollRightEnd\\\" is excuted, this event would be called\")","path":"appinventor/components/src/com/google/appinventor/components/runtime/HorizontalScrollArrangement.java","position":82,"original_position":82,"commit_id":"64344842293f1b12d17b68a1bb6e129a56902435","original_commit_id":"64344842293f1b12d17b68a1bb6e129a56902435","user":{"login":"ewpatton","id":1331253,"avatar_url":"https://avatars1.githubusercontent.com/u/1331253?v=4","gravatar_id":"","url":"https://api.github.com/users/ewpatton","html_url":"https://github.com/ewpatton","followers_url":"https://api.github.com/users/ewpatton/followers","following_url":"https://api.github.com/users/ewpatton/following{/other_user}","gists_url":"https://api.github.com/users/ewpatton/gists{/gist_id}","starred_url":"https://api.github.com/users/ewpatton/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ewpatton/subscriptions","organizations_url":"https://api.github.com/users/ewpatton/orgs","repos_url":"https://api.github.com/users/ewpatton/repos","events_url":"https://api.github.com/users/ewpatton/events{/privacy}","received_events_url":"https://api.github.com/users/ewpatton/received_events","type":"User","site_admin":false},"body":"Ditto.","created_at":"2018-02-22T01:44:20Z","updated_at":"2018-02-22T01:55:06Z","html_url":"https://github.com/mit-cml/appinventor-sources/pull/940#discussion_r169834072","pull_request_url":"https://api.github.com/repos/mit-cml/appinventor-sources/pulls/940","author_association":"CONTRIBUTOR","_links":{"self":{"href":"https://api.github.com/repos/mit-cml/appinventor-sources/pulls/comments/169834072"},"html":{"href":"https://github.com/mit-cml/appinventor-sources/pull/940#discussion_r169834072"},"pull_request":{"href":"https://api.github.com/repos/mit-cml/appinventor-sources/pulls/940"}}},"pull_request":{"url":"https://api.github.com/repos/mit-cml/appinventor-sources/pulls/940","id":142896888,"html_url":"https://github.com/mit-cml/appinventor-sources/pull/940","diff_url":"https://github.com/mit-cml/appinventor-sources/pull/940.diff","patch_url":"https://github.com/mit-cml/appinventor-sources/pull/940.patch","issue_url":"https://api.github.com/repos/mit-cml/appinventor-sources/issues/940","number":940,"state":"open","locked":false,"title":"Scrolling 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& control the ScrollView (for both VerticalScrollArrangement and HorizontalScrollArrangement)\r\n- Component version upgraded (1->2 no block need to upgrade)\r\n- Chinese Simplifed Translation for these is ready","created_at":"2017-09-25T14:25:13Z","updated_at":"2018-02-22T01:55:06Z","closed_at":null,"merged_at":null,"merge_commit_sha":"b1d0d51bf5d8a901b420af7dc319be24688f42c7","assignee":{"login":"ewpatton","id":1331253,"avatar_url":"https://avatars1.githubusercontent.com/u/1331253?v=4","gravatar_id":"","url":"https://api.github.com/users/ewpatton","html_url":"https://github.com/ewpatton","followers_url":"https://api.github.com/users/ewpatton/followers","following_url":"https://api.github.com/users/ewpatton/following{/other_user}","gists_url":"https://api.github.com/users/ewpatton/gists{/gist_id}","starred_url":"https://api.github.com/users/ewpatton/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ewpatton/subscriptions","organizations_url":"https://api.github.com/users/ewpatton/orgs","repos_url":"https://api.github.com/users/ewpatton/repos","events_url":"https://api.github.com/users/ewpatton/events{/privacy}","received_events_url":"https://api.github.com/users/ewpatton/received_events","type":"User","site_admin":false},"assignees":[{"login":"ewpatton","id":1331253,"avatar_url":"https://avatars1.githubusercontent.com/u/1331253?v=4","gravatar_id":"","url":"https://api.github.com/users/ewpatton","html_url":"https://github.com/ewpatton","followers_url":"https://api.github.com/users/ewpatton/followers","following_url":"https://api.github.com/users/ewpatton/following{/other_user}","gists_url":"https://api.github.com/users/ewpatton/gists{/gist_id}","starred_url":"https://api.github.com/users/ewpatton/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ewpatton/subscriptions","organizations_url":"https://api.github.com/users/ewpatton/orgs","repos_url":"https://api.github.com/users/ewpatton/repos","events_url":"https://api.github.com/users/ewpatton/events{/privacy}","received_events_url":"https://api.github.com/users/ewpatton/received_events","type":"User","site_admin":false}],"requested_reviewers":[{"login":"weihuali0509","id":1775235,"avatar_url":"https://avatars0.githubusercontent.com/u/1775235?v=4","gravatar_id":"","url":"https://api.github.com/users/weihuali0509","html_url":"https://github.com/weihuali0509","followers_url":"https://api.github.com/users/weihuali0509/followers","following_url":"https://api.github.com/users/weihuali0509/following{/other_user}","gists_url":"https://api.github.com/users/weihuali0509/gists{/gist_id}","starred_url":"https://api.github.com/users/weihuali0509/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/weihuali0509/subscriptions","organizations_url":"https://api.github.com/users/weihuali0509/orgs","repos_url":"https://api.github.com/users/weihuali0509/repos","events_url":"https://api.github.com/users/weihuali0509/events{/privacy}","received_events_url":"https://api.github.com/users/weihuali0509/received_events","type":"User","site_admin":false},{"login":"cavedunissin","id":13130483,"avatar_url":"https://avatars3.githubusercontent.com/u/13130483?v=4","gravatar_id":"","url":"https://api.github.com/users/cavedunissin","html_url":"https://github.com/cavedunissin","followers_url":"https://api.github.com/users/cavedunissin/followers","following_url":"https://api.github.com/users/cavedunissin/following{/other_user}","gists_url":"https://api.github.com/users/cavedunissin/gists{/gist_id}","starred_url":"https://api.github.com/users/cavedunissin/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/cavedunissin/subscriptions","organizations_url":"https://api.github.com/users/cavedunissin/orgs","repos_url":"https://api.github.com/users/cavedunissin/repos","events_url":"https://api.github.com/users/cavedunissin/events{/privacy}","received_events_url":"https://api.github.com/users/cavedunissin/received_events","type":"User","site_admin":false}],"requested_teams":[],"labels":[{"id":778090311,"url":"https://api.github.com/repos/mit-cml/appinventor-sources/labels/affects:%20ucr","name":"affects: 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