add support for floating drawings

- added need elements and test for them

src/file/drawing/floating/vertical-position.ts

@@ -0,0 +1,35 @@
+// http://officeopenxml.com/drwPicFloating-position.php
+import { XmlComponent, XmlAttributeComponent } from "file/xml-components";
+import { VerticalPositionRelativeFrom, VerticalPositionOptions } from "./floating-position";
+import { Align } from "./align";
+import { PositionOffset } from "./position-offset";
+
+interface IVerticalPositionAttributes {
+    relativeFrom: VerticalPositionRelativeFrom;
+}
+
+class VerticalPositionAttributes extends XmlAttributeComponent<IVerticalPositionAttributes> {
+    protected xmlKeys = {
+        relativeFrom: "relativeFrom",
+    };
+}
+
+export class VerticalPosition extends XmlComponent {
+    constructor(verticalPosition: VerticalPositionOptions) {
+        super("wp:positionV");
+
+        this.root.push(
+            new VerticalPositionAttributes({
+                relativeFrom: verticalPosition.relative,
+            }),
+        );
+
+        if (verticalPosition.align) {
+            this.root.push(new Align(verticalPosition.align));
+        } else if (verticalPosition.offset !== undefined) {
+            this.root.push(new PositionOffset(verticalPosition.offset));
+        } else {
+            throw new Error("There is no configuration provided for floating position (Align or offset)");
+        }
+    }
+}