1 files changed, 31 insertions, 0 deletions
diff --git a/lib/extensions/stitch_plan_preview_undo.py b/lib/extensions/stitch_plan_preview_undo.py
new file mode 100644
index 00000000..381cf549
--- /dev/null
+++ b/lib/extensions/stitch_plan_preview_undo.py
@@ -0,0 +1,31 @@
+# Authors: see git history
+#
+# Copyright (c) 2022 Authors
+# Licensed under the GNU GPL version 3.0 or later.  See the file LICENSE for details.
+
+from ..svg.tags import INKSCAPE_GROUPMODE, INKSTITCH_ATTRIBS, SVG_GROUP_TAG
+from .base import InkstitchExtension
+
+
+class StitchPlanPreviewUndo(InkstitchExtension):
+    def effect(self):
+        reset_stitch_plan(self.document.getroot())
+
+
+def reset_stitch_plan(svg):
+    # delete old stitch plan
+    layer = svg.find(".//*[@id='__inkstitch_stitch_plan__']")
+    # get previously invisible layers (they still should be hidden afterwards)
+    if layer is not None:
+        invisible_layers = layer.get(INKSTITCH_ATTRIBS['invisible_layers'], '').split(",")
+        layer.getparent().remove(layer)
+
+        # if there are layers with reduced opacity, remove opacity attribute or unhide hidden layers
+        for g in svg.findall(SVG_GROUP_TAG):
+            style = g.specified_style()
+            if (g.get(INKSCAPE_GROUPMODE) == "layer" and float(style.get('opacity', 1)) == 0.4 or style.get('display', 'inline') == 'none'):
+                if g.get_id() in invisible_layers:
+                    continue
+
+                g.style['opacity'] = 1
+                g.style['display'] = 'inline'