First upload, 18 controller version

app/ui/preset_browser.py

@@ -0,0 +1,75 @@
+from __future__ import annotations
+
+from app.qt_compat import QHBoxLayout, QInputDialog, QListWidget, QListWidgetItem, QMessageBox, QPushButton, Qt, QVBoxLayout, QWidget
+from app.ui.section_panel import SectionPanel
+
+
+class PresetBrowser(QWidget):
+    def __init__(self, controller, parent: QWidget | None = None) -> None:
+        super().__init__(parent)
+        self.controller = controller
+
+        layout = QVBoxLayout(self)
+        layout.setContentsMargins(0, 0, 0, 0)
+
+        group = SectionPanel("Presets")
+        group_layout = QVBoxLayout(group.body)
+        group_layout.setContentsMargins(12, 12, 12, 12)
+        group_layout.setSpacing(8)
+
+        self.list_widget = QListWidget()
+        self.list_widget.itemDoubleClicked.connect(self._load_selected)
+        group_layout.addWidget(self.list_widget, 1)
+
+        button_row = QHBoxLayout()
+        self.save_button = QPushButton("Save Current")
+        self.load_button = QPushButton("Load")
+        self.delete_button = QPushButton("Delete")
+        button_row.addWidget(self.save_button)
+        button_row.addWidget(self.load_button)
+        button_row.addWidget(self.delete_button)
+        group_layout.addLayout(button_row)
+
+        layout.addWidget(group)
+
+        self.save_button.clicked.connect(self._save_current)
+        self.load_button.clicked.connect(self._load_selected)
+        self.delete_button.clicked.connect(self._delete_selected)
+        self.controller.presets_changed.connect(self.refresh)
+        self.refresh()
+
+    def refresh(self) -> None:
+        self.list_widget.clear()
+        for preset in self.controller.available_presets():
+            item = QListWidgetItem(preset.name)
+            item.setToolTip(f"{preset.pattern_id}\nPalette: {preset.palette}")
+            self.list_widget.addItem(item)
+
+    def _selected_name(self) -> str | None:
+        item = self.list_widget.currentItem()
+        return item.text() if item else None
+
+    def _save_current(self) -> None:
+        name, ok = QInputDialog.getText(self, "Save Preset", "Preset name:")
+        if ok and name.strip():
+            self.controller.save_current_preset(name.strip())
+            self.refresh()
+
+    def _load_selected(self, *_args) -> None:
+        name = self._selected_name()
+        if name:
+            self.controller.apply_preset(name)
+
+    def _delete_selected(self) -> None:
+        name = self._selected_name()
+        if not name:
+            return
+        confirm = QMessageBox.question(
+            self,
+            "Delete Preset",
+            f"Delete preset '{name}'?",
+            QMessageBox.Yes | QMessageBox.No,
+        )
+        if confirm == QMessageBox.Yes:
+            self.controller.delete_preset(name)
+            self.refresh()