Move centerWindowsIfNeeded to an action creatorThis forces us to type it, as a nice side benefit

js/actionCreators/index.ts

@@ -20,7 +20,8 @@ export {
   toggleWindow,
   updateWindowPositions,
   toggleMainWindowShadeMode,
-  windowsHaveBeenCentered
+  windowsHaveBeenCentered,
+  centerWindowsIfNeeded
 } from "./windows";
 export {
   play,

js/actionCreators/windows.ts

@@ -1,7 +1,10 @@
 import {
   getWindowGraph,
   getWindowSizes,
-  getWindowPositions
+  getWindowPositions,
+  getWindowsInfo,
+  getWindowOpen,
+  getGenWindows
 } from "../selectors";
 
 import { objectMap } from "../utils";
@@ -20,6 +23,9 @@ import { getPositionDiff, SizeDiff } from "../resizeUtils";
 import { applyDiff } from "../snapUtils";
 import { Action, Dispatchable, WindowId, WindowPositions } from "../types";
 
+import { WINDOW_HEIGHT, WINDOW_WIDTH } from "../constants";
+import { calculateBoundingBox } from "../utils";
+
 // Dispatch an action and, if needed rearrange the windows to preserve
 // the existing edge relationship.
 //
@@ -111,6 +117,70 @@ export function updateWindowPositions(
   return { type: UPDATE_WINDOW_POSITIONS, positions, center };
 }
 
-export function windowsHaveBeenCentered() {
+export function windowsHaveBeenCentered(): Dispatchable {
   return { type: WINDOWS_HAVE_BEEN_CENTERED };
 }
+
+export function centerWindowsIfNeeded(container: HTMLElement): Dispatchable {
+  return (dispatch, getState) => {
+    const state = getState();
+    const { centerRequested } = state.windows;
+    if (!centerRequested) {
+      return;
+    }
+    const genWindows = getGenWindows(state);
+    const windowsInfo = getWindowsInfo(state);
+    const getOpen = getWindowOpen(state);
+    const rect = container.getBoundingClientRect();
+
+    const offsetLeft = rect.left + window.scrollX;
+    const offsetTop = rect.top + window.scrollY;
+    const width = container.scrollWidth;
+    const height = container.scrollHeight;
+
+    if (windowsInfo.some(w => w.x == null || w.y == null)) {
+      // Some windows do not have an initial position, so we'll come up
+      // with your own layout.
+      const windowPositions: WindowPositions = {};
+      const keys: string[] = Object.keys(genWindows).filter(
+        windowId => genWindows[windowId].open
+      );
+      const totalHeight = keys.length * WINDOW_HEIGHT;
+      const globalOffsetLeft = Math.max(0, width / 2 - WINDOW_WIDTH / 2);
+      const globalOffsetTop = Math.max(0, height / 2 - totalHeight / 2);
+      keys.forEach((key, i) => {
+        const offset = WINDOW_HEIGHT * i;
+        windowPositions[key] = {
+          x: Math.ceil(offsetLeft + globalOffsetLeft),
+          y: Math.ceil(offsetTop + (globalOffsetTop + offset))
+        };
+      });
+      dispatch(updateWindowPositions(windowPositions, false));
+    } else {
+      // A layout has been suplied. We will compute the bounding box and
+      // center the given layout.
+      const bounding = calculateBoundingBox(
+        windowsInfo.filter(w => getOpen(w.key))
+      );
+
+      const boxHeight = bounding.bottom - bounding.top;
+      const boxWidth = bounding.right - bounding.left;
+
+      const move = {
+        x: Math.ceil(offsetLeft - bounding.left + (width - boxWidth) / 2),
+        y: Math.ceil(offsetTop - bounding.top + (height - boxHeight) / 2)
+      };
+
+      const newPositions = windowsInfo.reduce(
+        (pos, w) => ({
+          ...pos,
+          [w.key]: { x: move.x + w.x, y: move.y + w.y }
+        }),
+        {}
+      );
+
+      dispatch(updateWindowPositions(newPositions, false));
+    }
+    dispatch(windowsHaveBeenCentered());
+  };
+}

js/components/WindowManager.js

@@ -11,19 +11,12 @@ import {
   applyDiff,
   applyMultipleDiffs
 } from "../snapUtils";
-import {
-  getWindowsInfo,
-  getWindowHidden,
-  getWindowOpen,
-  getCenterRequested
-} from "../selectors";
+import { getWindowsInfo, getWindowHidden, getWindowOpen } from "../selectors";
 import {
   updateWindowPositions,
-  windowsHaveBeenCentered
+  windowsHaveBeenCentered,
+  centerWindowsIfNeeded
 } from "../actionCreators";
-import { WINDOW_HEIGHT, WINDOW_WIDTH } from "../constants";
-import { calculateBoundingBox } from "../utils";
-
 const abuts = (a, b) => {
   // TODO: This is kinda a hack. They should really be touching, not just within snapping distance.
   // Also, overlapping should not count.
@@ -33,65 +26,9 @@ const abuts = (a, b) => {
 
 class WindowManager extends React.Component {
   componentDidMount() {
-    this.centerWindowsIfNeeded();
+    this.props.centerWindowsIfNeeded(this.props.container);
   }
 
-  centerWindowsIfNeeded = () => {
-    const { container, centerRequested } = this.props;
-    if (!centerRequested) {
-      return;
-    }
-
-    const rect = container.getBoundingClientRect();
-    const offsetLeft = rect.left + window.scrollX;
-    const offsetTop = rect.top + window.scrollY;
-    const width = container.scrollWidth;
-    const height = container.scrollHeight;
-
-    if (this.props.windowsInfo.some(w => w.x == null || w.y == null)) {
-      // Some windows do not have an initial position, so we'll come up
-      // with your own layout.
-      const windowPositions = {};
-      const keys = this.windowKeys();
-      const totalHeight = keys.length * WINDOW_HEIGHT;
-      const globalOffsetLeft = Math.max(0, width / 2 - WINDOW_WIDTH / 2);
-      const globalOffsetTop = Math.max(0, height / 2 - totalHeight / 2);
-      keys.forEach((key, i) => {
-        const offset = WINDOW_HEIGHT * i;
-        windowPositions[key] = {
-          x: Math.ceil(offsetLeft + globalOffsetLeft),
-          y: Math.ceil(offsetTop + (globalOffsetTop + offset))
-        };
-      });
-      this.props.updateWindowPositions(windowPositions, false);
-    } else {
-      // A layout has been suplied. We will compute the bounding box and
-      // center the given layout.
-      const bounding = calculateBoundingBox(
-        this.props.windowsInfo.filter(w => this.props.getWindowOpen(w.key))
-      );
-
-      const boxHeight = bounding.bottom - bounding.top;
-      const boxWidth = bounding.right - bounding.left;
-
-      const move = {
-        x: Math.ceil(offsetLeft - bounding.left + (width - boxWidth) / 2),
-        y: Math.ceil(offsetTop - bounding.top + (height - boxHeight) / 2)
-      };
-
-      const newPositions = this.props.windowsInfo.reduce(
-        (pos, w) => ({
-          ...pos,
-          [w.key]: { x: move.x + w.x, y: move.y + w.y }
-        }),
-        {}
-      );
-
-      this.props.updateWindowPositions(newPositions, false);
-    }
-    this.props.windowsHaveBeenCentered();
-  };
-
   movingAndStationaryNodes(key) {
     const windows = this.props.windowsInfo.filter(
       w =>
@@ -183,14 +120,6 @@ class WindowManager extends React.Component {
     window.addEventListener("mousemove", handleMouseMove);
   };
 
-  // Keys for the visible windows
-  windowKeys() {
-    // TODO: Iterables can probably do this better.
-    return Object.keys(this.props.windows).filter(
-      key => !!this.props.windows[key]
-    );
-  }
-
   render() {
     const style = {
       position: "absolute",
@@ -222,15 +151,16 @@ WindowManager.propTypes = {
 const mapStateToProps = state => ({
   windowsInfo: getWindowsInfo(state),
   getWindowHidden: getWindowHidden(state),
-  getWindowOpen: getWindowOpen(state),
-  centerRequested: getCenterRequested(state)
+  getWindowOpen: getWindowOpen(state)
 });
 
 const mapDispatchToProps = dispatch => {
   return {
     updateWindowPositions: (positions, centered) =>
       dispatch(updateWindowPositions(positions, centered)),
-    windowsHaveBeenCentered: () => dispatch(windowsHaveBeenCentered())
+    windowsHaveBeenCentered: () => dispatch(windowsHaveBeenCentered()),
+    centerWindowsIfNeeded: container =>
+      dispatch(centerWindowsIfNeeded(container))
   };
 };
 

js/types.ts

@@ -342,6 +342,7 @@ export type Action =
   | {
       type: "MINIMIZE_WINAMP";
     }
+  | { type: "WINDOWS_HAVE_BEEN_CENTERED" }
   | {
       type: "CLOSE_REQUESTED";
       cancel: () => void;

js/utils.ts

@@ -1,4 +1,5 @@
 import { DEFAULT_SKIN } from "./constants";
+import { WindowInfo } from "./types";
 
 interface Time {
   minutesFirstDigit: string;
@@ -318,16 +319,7 @@ export function objectFilter<V>(
   }, {});
 }
 
-interface Window {
-  left: number;
-  top: number;
-  x: number;
-  y: number;
-  width: number;
-  height: number;
-}
-
-export const calculateBoundingBox = (windows: Window[]) =>
+export const calculateBoundingBox = (windows: WindowInfo[]) =>
   windows
     .map(w => ({
       left: w.x,