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Diffstat (limited to 'release/scripts/templates_py/ui_previews_dynamic_enum.py')
-rw-r--r--release/scripts/templates_py/ui_previews_dynamic_enum.py137
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diff --git a/release/scripts/templates_py/ui_previews_dynamic_enum.py b/release/scripts/templates_py/ui_previews_dynamic_enum.py
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+# This sample script demonstrates a dynamic EnumProperty with custom icons.
+# The EnumProperty is populated dynamically with thumbnails of the contents of
+# a chosen directory in 'enum_previews_from_directory_items'.
+# Then, the same enum is displayed with different interfaces. Note that the
+# generated icon previews do not have Blender IDs, which means that they can
+# not be used with UILayout templates that require IDs,
+# such as template_list and template_ID_preview.
+#
+# Other use cases:
+# - make a fixed list of enum_items instead of calculating them in a function
+# - generate isolated thumbnails to use as custom icons in buttons
+# and menu items
+#
+# For custom icons, see the template "ui_previews_custom_icon.py".
+#
+# For distributable scripts, it is recommended to place the icons inside the
+# script directory and access it relative to the py script file for portability:
+#
+# os.path.join(os.path.dirname(__file__), "images")
+
+
+import os
+import bpy
+
+
+def enum_previews_from_directory_items(self, context):
+ """EnumProperty callback"""
+ enum_items = []
+
+ if context is None:
+ return enum_items
+
+ wm = context.window_manager
+ directory = wm.my_previews_dir
+
+ # Get the preview collection (defined in register func).
+ pcoll = preview_collections["main"]
+
+ if directory == pcoll.my_previews_dir:
+ return pcoll.my_previews
+
+ print("Scanning directory: %s" % directory)
+
+ if directory and os.path.exists(directory):
+ # Scan the directory for png files
+ image_paths = []
+ for fn in os.listdir(directory):
+ if fn.lower().endswith(".png"):
+ image_paths.append(fn)
+
+ for i, name in enumerate(image_paths):
+ # generates a thumbnail preview for a file.
+ filepath = os.path.join(directory, name)
+ thumb = pcoll.load(filepath, filepath, 'IMAGE')
+ enum_items.append((name, name, "", thumb.icon_id, i))
+
+ pcoll.my_previews = enum_items
+ pcoll.my_previews_dir = directory
+ return pcoll.my_previews
+
+
+class PreviewsExamplePanel(bpy.types.Panel):
+ """Creates a Panel in the Object properties window"""
+ bl_label = "Previews Example Panel"
+ bl_idname = "OBJECT_PT_previews"
+ bl_space_type = 'PROPERTIES'
+ bl_region_type = 'WINDOW'
+ bl_context = "object"
+
+ def draw(self, context):
+ layout = self.layout
+ wm = context.window_manager
+
+ row = layout.row()
+ row.prop(wm, "my_previews_dir")
+
+ row = layout.row()
+ row.template_icon_view(wm, "my_previews")
+
+ row = layout.row()
+ row.prop(wm, "my_previews")
+
+
+# We can store multiple preview collections here,
+# however in this example we only store "main"
+preview_collections = {}
+
+
+def register():
+ from bpy.types import WindowManager
+ from bpy.props import (
+ StringProperty,
+ EnumProperty,
+ )
+
+ WindowManager.my_previews_dir = StringProperty(
+ name="Folder Path",
+ subtype='DIR_PATH',
+ default=""
+ )
+
+ WindowManager.my_previews = EnumProperty(
+ items=enum_previews_from_directory_items,
+ )
+
+ # Note that preview collections returned by bpy.utils.previews
+ # are regular Python objects - you can use them to store custom data.
+ #
+ # This is especially useful here, since:
+ # - It avoids us regenerating the whole enum over and over.
+ # - It can store enum_items' strings
+ # (remember you have to keep those strings somewhere in py,
+ # else they get freed and Blender references invalid memory!).
+ import bpy.utils.previews
+ pcoll = bpy.utils.previews.new()
+ pcoll.my_previews_dir = ""
+ pcoll.my_previews = ()
+
+ preview_collections["main"] = pcoll
+
+ bpy.utils.register_class(PreviewsExamplePanel)
+
+
+def unregister():
+ from bpy.types import WindowManager
+
+ del WindowManager.my_previews
+
+ for pcoll in preview_collections.values():
+ bpy.utils.previews.remove(pcoll)
+ preview_collections.clear()
+
+ bpy.utils.unregister_class(PreviewsExamplePanel)
+
+
+if __name__ == "__main__":
+ register()