feat(cdk-experimental/ui-patterns): add grid selection behavior

src/cdk-experimental/ui-patterns/behaviors/grid-focus/grid-focus.ts

@@ -167,7 +167,7 @@ export class GridFocus<T extends GridFocusCell> {
   }
 
   /** Finds the top-left anchor coordinates of a given cell instance in the grid. */
-  getCoordinates(cellToFind: T): RowCol | void {
+  getCoordinates(cellToFind: T): RowCol | undefined {
     const grid = this.inputs.cells();
     const occupiedCells = new Set<string>();
 
@@ -203,10 +203,12 @@ export class GridFocus<T extends GridFocusCell> {
         colindex += colspan;
       }
     }
+
+    return undefined;
   }
 
   /** Gets the cell that covers the given coordinates, considering rowspan and colspan. */
-  getCell(coords: RowCol): T | void {
+  getCell(coords: RowCol): T | undefined {
     for (const row of this.inputs.cells()) {
       for (const cell of row) {
         if (
@@ -219,5 +221,6 @@ export class GridFocus<T extends GridFocusCell> {
         }
       }
     }
+    return undefined;
   }
 }

src/cdk-experimental/ui-patterns/behaviors/grid-selection/BUILD.bazel

@@ -0,0 +1,28 @@
+load("//tools:defaults.bzl", "ng_web_test_suite", "ts_project")
+
+package(default_visibility = ["//visibility:public"])
+
+ts_project(
+    name = "grid-selection",
+    srcs = ["grid-selection.ts"],
+    deps = [
+        "//:node_modules/@angular/core",
+        "//src/cdk-experimental/ui-patterns/behaviors/grid-focus",
+        "//src/cdk-experimental/ui-patterns/behaviors/signal-like",
+    ],
+)
+
+ts_project(
+    name = "unit_test_sources",
+    testonly = True,
+    srcs = ["grid-selection.spec.ts"],
+    deps = [
+        ":grid-selection",
+        "//:node_modules/@angular/core",
+    ],
+)
+
+ng_web_test_suite(
+    name = "unit_tests",
+    deps = [":unit_test_sources"],
+)