✨ Adds paddings and gaps prediction on layout creation

CHANGES.md

@@ -5,6 +5,7 @@
 ### :boom: Breaking changes & Deprecations
 
 ### :sparkles: New features
+- Adds paddings and gaps prediction on layout creation [Taiga #4838](https://tree.taiga.io/project/penpot/task/4838)
 
 ### :bug: Bugs fixed
 

frontend/src/app/main/data/workspace/shape_layout.cljs

@@ -65,6 +65,81 @@
           (cond-> (not from-frame?)
             (assoc :show-content true :hide-in-viewer true))))))
 
+
+(defn shapes->flex-params
+  "Given the shapes calculate its flex parameters (horizontal vs vertical, gaps, etc)"
+  ([objects shapes]
+   (shapes->flex-params objects shapes nil))
+  ([objects shapes parent]
+   (let [points
+         (->> shapes
+              (map :id)
+              (ctt/sort-z-index objects)
+              (map (comp gsh/center-shape (d/getf objects))))
+
+         start (first points)
+         end (reduce (fn [acc p] (gpt/add acc (gpt/to-vec start p))) points)
+
+         angle (gpt/signed-angle-with-other
+                (gpt/to-vec start end)
+                (gpt/point 1 0))
+
+         angle (mod angle 360)
+
+         t1 (min (abs (-  angle 0)) (abs (-  angle 360)))
+         t2 (abs (- angle 90))
+         t3 (abs (- angle 180))
+         t4 (abs (- angle 270))
+
+         tmin (min t1 t2 t3 t4)
+
+         direction
+         (cond
+           (mth/close? tmin t1) :row
+           (mth/close? tmin t2) :column-reverse
+           (mth/close? tmin t3) :row-reverse
+           (mth/close? tmin t4) :column)
+
+         selrects (->> shapes
+                       (mapv :selrect))
+         min-x (->> selrects
+                    (mapv #(min (:x1 %) (:x2 %)))
+                    (apply min))
+         max-x (->> selrects
+                    (mapv #(max (:x1 %) (:x2 %)))
+                    (apply max))
+         all-width (->> selrects
+                        (map :width)
+                        (reduce +))
+         column-gap (if (or (= direction :row) (= direction :row-reverse))
+                      (/ (- (- max-x min-x) all-width) (dec (count shapes)))
+                      0)
+
+         min-y (->> selrects
+                    (mapv #(min (:y1 %) (:y2 %)))
+                    (apply min))
+         max-y (->> selrects
+                    (mapv #(max (:y1 %) (:y2 %)))
+                    (apply max))
+         all-height (->> selrects
+                         (map :height)
+                         (reduce +))
+         row-gap (if (or (= direction :column) (= direction :column-reverse))
+                   (/ (- (- max-y min-y) all-height) (dec (count shapes)))
+                   0)
+
+         layout-gap {:row-gap row-gap :column-gap column-gap}
+
+         parent-selrect (:selrect parent)
+         padding (when (and (not (nil? parent)) (> (count shapes) 1))
+                   {:p1 (min (- min-y (:y1 parent-selrect)) (- (:y2 parent-selrect) max-y))
+                    :p2 (min (- min-x (:x1 parent-selrect)) (- (:x2 parent-selrect) max-x))})]
+
+     (cond-> {:layout-flex-dir direction}
+       (not (nil? padding)) (assoc :layout-padding {:p1 (:p1 padding) :p2 (:p2 padding) :p3 (:p1 padding) :p4 (:p2 padding)}
+                                   :layout-align-items :center
+                                   :layout-gap layout-gap)))))
+
 (defn create-layout-from-id
   [ids type from-frame?]
   (ptk/reify ::create-layout-from-id
@@ -72,9 +147,19 @@
     (watch [_ state _]
       (let [objects         (wsh/lookup-page-objects state)
             children-ids    (into [] (mapcat #(get-in objects [% :shapes])) ids)
+            children-shapes (map (d/getf objects) children-ids)
+            parent          (get objects (first ids))
+            flex-params     (shapes->flex-params objects children-shapes parent)
             undo-id         (js/Symbol)]
         (rx/of (dwu/start-undo-transaction undo-id)
                (dwc/update-shapes ids (get-layout-initializer type from-frame?))
+               (dwc/update-shapes
+                ids
+                (fn [shape]
+                  (-> shape
+                      (assoc :layout-item-h-sizing :auto
+                             :layout-item-v-sizing :auto)
+                      (merge flex-params))))
                (ptk/data-event :layout/update ids)
                (dwc/update-shapes children-ids #(dissoc % :constraints-h :constraints-v))
                (dwu/commit-undo-transaction undo-id))))))
@@ -110,40 +195,6 @@
   []
   (ptk/reify ::finalize))
 
-(defn shapes->flex-params
-  "Given the shapes calculate its flex parameters (horizontal vs vertical etc)"
-  [objects shapes]
-
-  (let [points
-        (->> shapes
-             (map :id)
-             (ctt/sort-z-index objects)
-             (map (comp gsh/center-shape (d/getf objects))))
-
-        start (first points)
-        end (reduce (fn [acc p] (gpt/add acc (gpt/to-vec start p))) points)
-
-        angle (gpt/signed-angle-with-other
-               (gpt/to-vec start end)
-               (gpt/point 1 0))
-
-        angle (mod angle 360)
-
-        t1 (min (abs (-  angle 0)) (abs (-  angle 360)))
-        t2 (abs (- angle 90))
-        t3 (abs (- angle 180))
-        t4 (abs (- angle 270))
-
-        tmin (min t1 t2 t3 t4)
-
-        direction
-        (cond
-          (mth/close? tmin t1) :row
-          (mth/close? tmin t2) :column-reverse
-          (mth/close? tmin t3) :row-reverse
-          (mth/close? tmin t4) :column)]
-
-    {:layout-flex-dir direction}))
 
 (defn create-layout-from-selection
   [type]