Import of the watch repository from Pebble

src/fw/applib/ui/action_button.c

@@ -0,0 +1,51 @@
+/*
+ * Copyright 2024 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "action_button.h"
+
+#include "applib/graphics/graphics.h"
+#include "applib/preferred_content_size.h"
+
+void action_button_draw(GContext *ctx, Layer *layer, GColor fill_color) {
+  // This should match the window bounds
+  const GRect bounds = layer->bounds;
+
+  // Glue button to the right side of the window
+  const int radius = PBL_IF_ROUND_ELSE(12, 13);
+  GRect rect = { .size = { radius * 2, radius * 2 } };
+  grect_align(&rect, &bounds, GAlignRight, false);
+
+  // Offset the button halfway off-screen
+  rect.origin.x += radius;
+
+  // Further offset the button on a per-default-content-size basis
+  // Note that this will need to be updated if we ever want ActionButton to adapt to the user's
+  // preferred content size
+  rect.origin.x += PREFERRED_CONTENT_SIZE_SWITCH(PreferredContentSizeDefault,
+    //! @note this is the same as Medium until Small is designed
+    /* small */ PBL_IF_ROUND_ELSE(1, 8),
+    /* medium */ PBL_IF_ROUND_ELSE(1, 8),
+    /* large */ 4,
+    //! @note this is the same as Large until ExtraLarge is designed
+    /* extralarge */ 4);
+
+  graphics_context_set_fill_color(ctx, fill_color);
+  graphics_fill_oval(ctx, rect, GOvalScaleModeFitCircle);
+}
+
+void action_button_update_proc(Layer *action_button_layer, GContext *ctx) {
+  action_button_draw(ctx, action_button_layer, GColorBlack);
+}