fix(lazy-images): support removing items in ListImagesWidget

Author: gil9red

sqlite3__examples/view_many_images__lazy__delegates__async_load_images/utils_PyQt6/FileListModel.py

@@ -97,6 +97,23 @@ def fetchMore(self, parent: QModelIndex | None = None) -> None:
             items_to_fetch, self.current_file_count, self.total_file_count
         )
 
+    def removeRows(self, row: int, count: int, parent :QModelIndex | None=None) -> bool:
+        self.beginRemoveRows(parent, row, row + count - 1)
+
+        del self.total_file_list[row: row + count]
+        self.current_file_count -= count
+
+        self.endRemoveRows()
+
+        # TODO: Зачем вообще нужен items_to_fetch?
+        remainder: int = self.total_file_count - self.current_file_count
+        items_to_fetch: int = min(self.batch_size, remainder)
+        self.numberPopulated.emit(
+            items_to_fetch, self.current_file_count, self.total_file_count
+        )
+
+        return True
+
     def set_total_file_list(self, file_list: list[str]) -> None:
         self.beginResetModel()
 

sqlite3__examples/view_many_images__lazy__delegates__async_load_images/utils_PyQt6/ListImagesWidget.py

@@ -6,7 +6,7 @@
 
 from PyQt6.QtGui import QImage
 from PyQt6.QtWidgets import QListView
-from PyQt6.QtCore import Qt
+from PyQt6.QtCore import Qt, QModelIndex
 
 from .ThumbnailDelegate import ThumbnailDelegate
 
@@ -21,6 +21,8 @@ def __init__(
     ) -> None:
         super().__init__()
 
+        self.image_cache: dict[str, QImage | None] = image_cache
+
         self.setMovement(QListView.Movement.Static)
         self.setDragEnabled(False)
         self.setDragDropMode(QListView.DragDropMode.NoDragDrop)
@@ -31,7 +33,7 @@ def __init__(
         self.setUniformItemSizes(True)
         self.setItemDelegate(
             ThumbnailDelegate(
-                self, icon_width, icon_height, image_cache, file_name_index
+                self, icon_width, icon_height, self.image_cache, file_name_index
             )
         )
 
@@ -41,3 +43,21 @@ def currentFileName(self) -> str | None:
             return None
 
         return index.data(Qt.ItemDataRole.DisplayRole)
+
+    def removeFromList(self, file_name: str) -> None:
+        model = self.model()
+
+        found_indexes: list[QModelIndex] = model.match(
+            model.index(0, 0),
+            Qt.ItemDataRole.DisplayRole,
+            file_name,
+            1,  # hits
+            Qt.MatchFlag.MatchExactly,
+        )
+        if found_indexes:
+            target_index: QModelIndex = found_indexes[0]
+            model.removeRow(target_index.row())
+
+            file_name = target_index.data(Qt.ItemDataRole.DisplayRole)
+            if file_name in self.image_cache:
+                self.image_cache.pop(file_name)