Move GridLayoutProvider inside RLV

package.json

@@ -36,7 +36,6 @@
   "dependencies": {
     "lodash.debounce": "4.0.8",
     "prop-types": "15.5.8",
-    "recyclerlistview-gridlayoutprovider": "1.0.1",
     "ts-object-utils": "0.0.5"
   },
   "peerDependencies": {

src/core/dependencies/GridLayoutProvider.ts

@@ -0,0 +1,57 @@
+import { LayoutProvider, Dimension } from "./LayoutProvider";
+import { Layout, LayoutManager } from "../layoutmanager/LayoutManager";
+import { GridLayoutManager } from "../layoutmanager/GridLayoutManager";
+
+export class GridLayoutProvider extends LayoutProvider {
+  private _getHeightOrWidth: (index: number) => number;
+  private _getSpan: (index: number) => number;
+  private _maxSpan: number;
+  private _renderWindowSize?: Dimension;
+  private _isHorizontal?: boolean;
+  private _acceptableRelayoutDelta: number;
+  constructor(
+    maxSpan: number,
+    getLayoutType: (index: number) => string | number,
+    getSpan: (index: number) => number,
+    // If horizonal return width while spans will be rowspans. Opposite holds true if not horizontal
+    getHeightOrWidth: (index: number) => number,
+    acceptableRelayoutDelta?: number,
+  ) {
+    super(
+      getLayoutType,
+      (type: string | number, dimension: Dimension, index: number) => {
+        this.setLayout(dimension, index);
+      },
+    );
+    this._getHeightOrWidth = getHeightOrWidth;
+    this._getSpan = getSpan;
+    this._maxSpan = maxSpan;
+    this._acceptableRelayoutDelta = ((acceptableRelayoutDelta === undefined) || (acceptableRelayoutDelta === null)) ? 1 : acceptableRelayoutDelta;
+  }
+
+  public newLayoutManager(renderWindowSize: Dimension, isHorizontal?: boolean, cachedLayouts?: Layout[]): LayoutManager {
+    this._isHorizontal = isHorizontal;
+    this._renderWindowSize = renderWindowSize;
+    return new GridLayoutManager(this, renderWindowSize, this._getSpan, this._maxSpan, this._acceptableRelayoutDelta, this._isHorizontal, cachedLayouts);
+  }
+
+  private setLayout(dimension: Dimension, index: number): void {
+    const maxSpan: number = this._maxSpan;
+    const itemSpan: number = this._getSpan(index);
+    if (itemSpan > maxSpan) {
+      throw new Error("Item span for index " + index + " is more than the max span");
+    }
+    if (this._renderWindowSize) {
+      if (this._isHorizontal) {
+        dimension.width = this._getHeightOrWidth(index);
+        dimension.height = (this._renderWindowSize.height / maxSpan) * itemSpan;
+
+      } else {
+        dimension.height = this._getHeightOrWidth(index);
+        dimension.width = (this._renderWindowSize.width / maxSpan) * itemSpan;
+      }
+    } else {
+      throw new Error("setLayout called before layoutmanager was created, cannot be handled");
+    }
+  }
+}

src/core/layoutmanager/GridLayoutManager.ts

@@ -0,0 +1,77 @@
+import { LayoutProvider } from "./../dependencies/LayoutProvider";
+import { WrapGridLayoutManager, Layout } from "./LayoutManager";
+import { Dimension } from "../dependencies/LayoutProvider";
+
+export class GridLayoutManager extends WrapGridLayoutManager {
+    private _maxSpan: number;
+    private _getSpan: (index: number) => number;
+    private _isGridHorizontal: boolean | undefined;
+    private _renderWindowSize: Dimension;
+    private _acceptableRelayoutDelta: number;
+    constructor(
+      layoutProvider: LayoutProvider,
+      renderWindowSize: Dimension,
+      getSpan: (index: number) => number,
+      maxSpan: number,
+      acceptableRelayoutDelta: number,
+      isHorizontal?: boolean,
+      cachedLayouts?: Layout[],
+    ) {
+      super(layoutProvider, renderWindowSize, isHorizontal, cachedLayouts);
+      this._getSpan = getSpan;
+      this._isGridHorizontal = isHorizontal;
+      this._renderWindowSize = renderWindowSize;
+      if (acceptableRelayoutDelta < 0) {
+        throw new Error("acceptableRelayoutDelta cannot be less than 0");
+      } else {
+        this._acceptableRelayoutDelta = acceptableRelayoutDelta;
+      }
+      if (maxSpan <= 0) {
+        throw new Error("Max Column Span cannot be less than or equal to 0");
+      } else {
+        this._maxSpan = maxSpan;
+      }
+    }
+
+    public overrideLayout(index: number, dim: Dimension): boolean {
+      // we are doing this because - when we provide decimal dimensions for a
+      // certain cell - the onlayout returns a different dimension in certain high end devices.
+      // This causes the layouting to behave weirdly as the new dimension might not adhere to the spans and the cells arrange themselves differently
+      // So, whenever we have layouts for a certain index, we explicitly override the dimension to those very layout values
+      // and call super so as to set the overridden flag as true
+      const layout = this.getLayouts()[index];
+      const heightDiff = Math.abs(dim.height - layout.height);
+      const widthDiff = Math.abs(dim.width - layout.width);
+      if (layout) {
+        if (this._isGridHorizontal) {
+          if (heightDiff < this._acceptableRelayoutDelta) {
+            if (widthDiff === 0) {
+              return false;
+            }
+            dim.height = layout.height;
+          }
+        } else {
+          if (widthDiff < this._acceptableRelayoutDelta) {
+            if (heightDiff === 0) {
+              return false;
+            }
+            dim.width = layout.width;
+          }
+        }
+      }
+      return super.overrideLayout(index, dim);
+    }
+
+    public getStyleOverridesForIndex(index: number): object | undefined {
+      const columnSpanForIndex = this._getSpan(index);
+      return this._isGridHorizontal
+        ? {
+          height:
+            (this._renderWindowSize.height / this._maxSpan) * columnSpanForIndex,
+        }
+        : {
+          width:
+            (this._renderWindowSize.width / this._maxSpan) * columnSpanForIndex,
+        };
+    }
+  }

src/index.ts

@@ -1,12 +1,13 @@
 import ContextProvider from "./core/dependencies/ContextProvider";
 import DataProvider, { BaseDataProvider } from "./core/dependencies/DataProvider";
 import { BaseLayoutProvider, Dimension, LayoutProvider } from "./core/dependencies/LayoutProvider";
-import { GridLayoutProvider, GridLayoutManager } from "recyclerlistview-gridlayoutprovider";
+import { GridLayoutProvider } from "./core/dependencies/GridLayoutProvider";
 import RecyclerListView, { OnRecreateParams } from "./core/RecyclerListView";
 import BaseScrollView from "./core/scrollcomponent/BaseScrollView";
 import { BaseItemAnimator } from "./core/ItemAnimator";
 import { AutoScroll } from "./utils/AutoScroll";
 import { Layout, LayoutManager, Point, WrapGridLayoutManager } from "./core/layoutmanager/LayoutManager";
+import { GridLayoutManager } from "./core/layoutmanager/GridLayoutManager";
 import ProgressiveListView from "./core/ProgressiveListView";
 import { DebugHandlers } from "./core/devutils/debughandlers/DebugHandlers";
 import { ComponentCompat } from "./utils/ComponentCompat";