feat: save exportScale in AppState (#3580)

Co-authored-by: David Luzar <luzar.david@gmail.com>
Co-authored-by: dwelle <luzar.david@gmail.com>

src/actions/actionExport.tsx

@@ -13,6 +13,10 @@ import { KEYS } from "../keys";
 import { register } from "./register";
 import { supported as fsSupported } from "browser-fs-access";
 import { CheckboxItem } from "../components/CheckboxItem";
+import { getExportSize } from "../scene/export";
+import { DEFAULT_EXPORT_PADDING, EXPORT_SCALES } from "../constants";
+import { getSelectedElements, isSomeElementSelected } from "../scene";
+import { getNonDeletedElements } from "../element";
 
 export const actionChangeProjectName = register({
   name: "changeProjectName",
@@ -32,6 +36,54 @@ export const actionChangeProjectName = register({
   ),
 });
 
+export const actionChangeExportScale = register({
+  name: "changeExportScale",
+  perform: (_elements, appState, value) => {
+    return {
+      appState: { ...appState, exportScale: value },
+      commitToHistory: false,
+    };
+  },
+  PanelComponent: ({ elements: allElements, appState, updateData }) => {
+    const elements = getNonDeletedElements(allElements);
+    const exportSelected = isSomeElementSelected(elements, appState);
+    const exportedElements = exportSelected
+      ? getSelectedElements(elements, appState)
+      : elements;
+
+    return (
+      <>
+        {EXPORT_SCALES.map((s) => {
+          const [width, height] = getExportSize(
+            exportedElements,
+            DEFAULT_EXPORT_PADDING,
+            s,
+          );
+
+          const scaleButtonTitle = `${t(
+            "buttons.scale",
+          )} ${s}x (${width}x${height})`;
+
+          return (
+            <ToolButton
+              key={s}
+              size="s"
+              type="radio"
+              icon={`${s}x`}
+              name="export-canvas-scale"
+              title={scaleButtonTitle}
+              aria-label={scaleButtonTitle}
+              id="export-canvas-scale"
+              checked={s === appState.exportScale}
+              onChange={() => updateData(s)}
+            />
+          );
+        })}
+      </>
+    );
+  },
+});
+
 export const actionChangeExportBackground = register({
   name: "changeExportBackground",
   perform: (_elements, appState, value) => {