Add location control button component

Add lit-google-map-location-button component that provides a native-looking
button for centering the map on the user's current location. The component:
- Uses the browser's Geolocation API to get user location
- Adds a control button to the map at a configurable position
- Centers the map on user location when clicked
- Dispatches events for location-found, location-error, location-requested
- Supports disabled state and loading animation

The main map component now supports a "controls" slot for adding custom
controls following the same pattern as markers and shapes.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: dfalling

README.md

@@ -8,6 +8,7 @@ This project is a fork of [lit-google-map](https://github.com/arkadiuszwojcik/li
 - update dependencies and keep current with Dependabot
 - add `zoom_changed`, `center_changed`, and `view_changed` events
 - move to [AdvancedMarkerElement](https://developers.google.com/maps/documentation/javascript/advanced-markers/migration)
+- add location button control for centering map on user's current location
 
 ## Table of contents
 
@@ -23,6 +24,8 @@ This project is a fork of [lit-google-map](https://github.com/arkadiuszwojcik/li
 
 [Polygon shape element attributes](#Polygon-shape-element-attributes)
 
+[Location button control](#Location-button-control)
+
 [How to build](#How-to-build)
 
 [License](#License)
@@ -208,6 +211,51 @@ Example:
 </lit-google-map-polygon>
 ```
 
+## Location button control
+
+The location button control adds a native-looking button to the map that centers the map on the user's current location using the browser's Geolocation API.
+
+**Note:** Geolocation requires HTTPS (or localhost for development).
+
+### Location button attributes
+
+- '_position_' - Control position on map (default: 'RIGHT_BOTTOM')
+  - Valid values: 'TOP_LEFT', 'TOP_CENTER', 'TOP_RIGHT', 'LEFT_TOP', 'LEFT_CENTER', 'LEFT_BOTTOM', 'RIGHT_TOP', 'RIGHT_CENTER', 'RIGHT_BOTTOM', 'BOTTOM_LEFT', 'BOTTOM_CENTER', 'BOTTOM_RIGHT'
+- '_label_' - Accessible label for screen readers (default: 'My Location')
+- '_disabled_' - Disable the button (default: false)
+
+### Location button events
+
+- '_location-requested_' - Fired when button is clicked and location request begins
+- '_location-found_' - Fired when location is successfully obtained
+  - Detail: `{lat: number, lng: number}`
+- '_location-error_' - Fired when geolocation fails
+  - Detail: `{code: number, message: string}`
+
+### Example
+
+Basic usage:
+
+```html
+<lit-google-map api-key="YOUR_GOOGLE_MAPS_API_KEY">
+  <lit-google-map-location-button slot="controls">
+  </lit-google-map-location-button>
+</lit-google-map>
+```
+
+With custom position:
+
+```html
+<lit-google-map api-key="YOUR_GOOGLE_MAPS_API_KEY">
+  <lit-google-map-location-button
+    slot="controls"
+    position="TOP_RIGHT"
+    label="Find Me"
+  >
+  </lit-google-map-location-button>
+</lit-google-map>
+```
+
 ## How to build
 
 Before build install all required packages:

dist/lit-google-map.bundle.js

@@ -163,6 +163,7 @@ var LitGoogleMap = (function (exports) {
           });
           this.updateMarkers();
           this.updateShapes();
+          this.updateControls();
       }
       getMapOptions() {
           return {
@@ -257,6 +258,15 @@ var LitGoogleMap = (function (exports) {
               s.attachToMap(this.map);
           }
       }
+      updateControls() {
+          const controlsSelector = this.shadowRoot.getElementById("controls-selector");
+          if (!controlsSelector)
+              return;
+          this.controls = controlsSelector.items;
+          for (const c of this.controls) {
+              c.changeMap(this.map);
+          }
+      }
       fitToMarkersChanged(retryAttempt = 0) {
           if (this.map && this.fitToMarkers && this.markers.length > 0) {
               const latLngBounds = new google.maps.LatLngBounds();
@@ -316,6 +326,13 @@ var LitGoogleMap = (function (exports) {
       >
         <slot id="shapes" name="shapes"></slot>
       </lit-selector>
+      <lit-selector
+        id="controls-selector"
+        selected-attribute="open"
+        activate-event="google-map-control-activate"
+      >
+        <slot id="controls" name="controls"></slot>
+      </lit-selector>
       <div id="map"></div>
     `;
       }
@@ -471,6 +488,210 @@ var LitGoogleMap = (function (exports) {
       t("lit-google-map-circle")
   ], exports.LitGoogleMapCircle);
 
+  exports.LitGoogleMapLocationButton = class LitGoogleMapLocationButton extends i {
+      constructor() {
+          super(...arguments);
+          this.position = "RIGHT_BOTTOM";
+          this.label = "My Location";
+          this.disabled = false;
+          this.map = null;
+          this.controlDiv = null;
+          this.controlButton = null;
+          this.isRequesting = false;
+      }
+      changeMap(newMap) {
+          this.map = newMap;
+          this.mapChanged();
+      }
+      mapChanged() {
+          if (this.controlDiv && this.map) {
+              this.controlDiv = null;
+              this.controlButton = null;
+          }
+          if (this.map && this.map instanceof google.maps.Map) {
+              this.mapReady();
+          }
+      }
+      mapReady() {
+          this.controlDiv = this.createControlButton();
+          const controlPosition = google.maps.ControlPosition[this.position];
+          if (controlPosition !== undefined) {
+              this.map.controls[controlPosition].push(this.controlDiv);
+          }
+      }
+      createControlButton() {
+          const controlDiv = document.createElement("div");
+          controlDiv.style.margin = "10px";
+          const controlButton = document.createElement("button");
+          controlButton.type = "button";
+          controlButton.title = this.label;
+          controlButton.setAttribute("aria-label", this.label);
+          controlButton.innerHTML = `
+      <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" width="18" height="18">
+        <path fill="currentColor" d="M12 8c-2.21 0-4 1.79-4 4s1.79 4 4 4 4-1.79 4-4-1.79-4-4-4zm8.94 3A8.994 8.994 0 0 0 13 3.06V1h-2v2.06A8.994 8.994 0 0 0 3.06 11H1v2h2.06A8.994 8.994 0 0 0 11 20.94V23h2v-2.06A8.994 8.994 0 0 0 20.94 13H23v-2h-2.06zM12 19c-3.87 0-7-3.13-7-7s3.13-7 7-7 7 3.13 7 7-3.13 7-7 7z"/>
+      </svg>
+    `;
+          Object.assign(controlButton.style, {
+              backgroundColor: "#fff",
+              border: "0",
+              borderRadius: "2px",
+              boxShadow: "0 1px 4px rgba(0,0,0,0.3)",
+              cursor: "pointer",
+              padding: "10px",
+              display: "flex",
+              alignItems: "center",
+              justifyContent: "center",
+              width: "40px",
+              height: "40px",
+              color: "#666",
+          });
+          controlButton.addEventListener("mouseenter", () => {
+              if (!this.disabled && !this.isRequesting) {
+                  controlButton.style.backgroundColor = "#f8f8f8";
+              }
+          });
+          controlButton.addEventListener("mouseleave", () => {
+              if (!this.disabled && !this.isRequesting) {
+                  controlButton.style.backgroundColor = "#fff";
+              }
+          });
+          controlButton.addEventListener("click", () => {
+              if (!this.disabled && !this.isRequesting) {
+                  this.handleLocationRequest();
+              }
+          });
+          this.controlButton = controlButton;
+          controlDiv.appendChild(controlButton);
+          return controlDiv;
+      }
+      async handleLocationRequest() {
+          if (!navigator.geolocation) {
+              this.dispatchEvent(new CustomEvent("location-error", {
+                  detail: {
+                      code: -1,
+                      message: "Geolocation is not supported by your browser",
+                  },
+                  bubbles: true,
+                  composed: true,
+              }));
+              return;
+          }
+          this.isRequesting = true;
+          this.setLoadingState(true);
+          this.dispatchEvent(new CustomEvent("location-requested", {
+              bubbles: true,
+              composed: true,
+          }));
+          try {
+              const position = await this.getCurrentPosition();
+              const lat = position.coords.latitude;
+              const lng = position.coords.longitude;
+              this.map.setCenter({ lat, lng });
+              this.map.setZoom(14);
+              this.dispatchEvent(new CustomEvent("location-found", {
+                  detail: { lat, lng },
+                  bubbles: true,
+                  composed: true,
+              }));
+          }
+          catch (error) {
+              let message = "Unable to retrieve your location";
+              let code = -1;
+              if (error instanceof GeolocationPositionError) {
+                  code = error.code;
+                  if (error.code === error.PERMISSION_DENIED) {
+                      message =
+                          "Location access denied. Please enable location permissions.";
+                  }
+                  else if (error.code === error.TIMEOUT) {
+                      message = "Location request timed out. Please try again.";
+                  }
+                  else if (error.code === error.POSITION_UNAVAILABLE) {
+                      message = "Location information is unavailable.";
+                  }
+              }
+              this.dispatchEvent(new CustomEvent("location-error", {
+                  detail: { code, message },
+                  bubbles: true,
+                  composed: true,
+              }));
+          }
+          finally {
+              this.isRequesting = false;
+              this.setLoadingState(false);
+          }
+      }
+      getCurrentPosition() {
+          return new Promise((resolve, reject) => {
+              navigator.geolocation.getCurrentPosition(resolve, reject, {
+                  timeout: 10000,
+                  enableHighAccuracy: true,
+              });
+          });
+      }
+      setLoadingState(loading) {
+          if (!this.controlButton)
+              return;
+          if (loading) {
+              this.controlButton.style.backgroundColor = "#f0f0f0";
+              this.controlButton.style.cursor = "wait";
+              const svg = this.controlButton.querySelector("svg");
+              if (svg) {
+                  svg.style.animation = "spin 1s linear infinite";
+                  const style = document.createElement("style");
+                  style.textContent = `
+          @keyframes spin {
+            from { transform: rotate(0deg); }
+            to { transform: rotate(360deg); }
+          }
+        `;
+                  if (!document.querySelector("style[data-location-button-spin]")) {
+                      style.setAttribute("data-location-button-spin", "true");
+                      document.head.appendChild(style);
+                  }
+              }
+          }
+          else {
+              this.controlButton.style.backgroundColor = "#fff";
+              this.controlButton.style.cursor = "pointer";
+              const svg = this.controlButton.querySelector("svg");
+              if (svg) {
+                  svg.style.animation = "";
+              }
+          }
+      }
+      attributeChangedCallback(name, oldval, newval) {
+          super.attributeChangedCallback(name, oldval, newval);
+          if (name === "disabled" && this.controlButton) {
+              if (this.disabled) {
+                  this.controlButton.style.backgroundColor = "#f0f0f0";
+                  this.controlButton.style.cursor = "not-allowed";
+                  this.controlButton.style.opacity = "0.6";
+              }
+              else {
+                  this.controlButton.style.backgroundColor = "#fff";
+                  this.controlButton.style.cursor = "pointer";
+                  this.controlButton.style.opacity = "1";
+              }
+          }
+      }
+  };
+  __decorate([
+      n({ type: String, reflect: true }),
+      __metadata("design:type", Object)
+  ], exports.LitGoogleMapLocationButton.prototype, "position", void 0);
+  __decorate([
+      n({ type: String, reflect: true }),
+      __metadata("design:type", Object)
+  ], exports.LitGoogleMapLocationButton.prototype, "label", void 0);
+  __decorate([
+      n({ type: Boolean, reflect: true }),
+      __metadata("design:type", Object)
+  ], exports.LitGoogleMapLocationButton.prototype, "disabled", void 0);
+  exports.LitGoogleMapLocationButton = __decorate([
+      t("lit-google-map-location-button")
+  ], exports.LitGoogleMapLocationButton);
+
   exports.LitGoogleMapMarker = class LitGoogleMapMarker extends i {
       constructor() {
           super(...arguments);