Slideshow mode, Win10 dark mode fixes, key propagation fix

- Add "Slideshow Mode" to preview right-click context menu
- Fix arrow key propagation in fullscreen/slideshow view
- Flatten Fusion dark mode buttons with stylesheet
- Fix Save button width, fix spinbox arrows on dark theme

booru_viewer/gui/app.py

@@ -301,7 +301,9 @@ class BooruApp(QMainWindow):
         self._preview.favorite_requested.connect(self._favorite_from_preview)
         self._preview.save_to_folder.connect(self._save_from_preview)
         self._preview.navigate.connect(self._navigate_preview)
+        self._preview.fullscreen_requested.connect(self._open_fullscreen_preview)
         self._preview.set_folders_callback(self._db.get_folders)
+        self._fullscreen_window = None
         self._preview.setMinimumWidth(300)
         right.addWidget(self._preview)
 
@@ -701,6 +703,9 @@ class BooruApp(QMainWindow):
         idx = self._grid.selected_index
         if 0 <= idx < len(self._grid._thumbs):
             self._grid._thumbs[idx]._cached_path = path
+        # Update fullscreen if open
+        if self._fullscreen_window and self._fullscreen_window.isVisible():
+            self._fullscreen_window.set_media(path, info)
 
     def _on_favorite_selected(self, fav) -> None:
         self._status.showMessage(f"Favorite #{fav.post_id}")
@@ -793,6 +798,24 @@ class BooruApp(QMainWindow):
                 self._db.add_folder(folder)
             self._save_to_library(self._posts[idx], target)
 
+    def _open_fullscreen_preview(self) -> None:
+        path = self._preview._current_path
+        if not path:
+            return
+        from .preview import FullscreenPreview
+        self._fullscreen_window = FullscreenPreview(parent=self)
+        self._fullscreen_window.navigate.connect(self._navigate_fullscreen)
+        self._fullscreen_window.set_media(path, self._preview._info_label.text())
+
+    def _navigate_fullscreen(self, direction: int) -> None:
+        self._navigate_preview(direction)
+        # For synchronous loads (cached/favorites), update immediately
+        if self._fullscreen_window and self._preview._current_path:
+            self._fullscreen_window.set_media(
+                self._preview._current_path,
+                self._preview._info_label.text(),
+            )
+
     def _close_preview(self) -> None:
         self._preview.clear()
 
@@ -1320,22 +1343,63 @@ def _apply_windows_dark_mode(app: QApplication) -> None:
             from PySide6.QtGui import QPalette, QColor
             app.setStyle("Fusion")
             palette = QPalette()
-            palette.setColor(QPalette.ColorRole.Window, QColor(30, 30, 30))
+            palette.setColor(QPalette.ColorRole.Window, QColor(32, 32, 32))
             palette.setColor(QPalette.ColorRole.WindowText, QColor(255, 255, 255))
-            palette.setColor(QPalette.ColorRole.Base, QColor(15, 15, 15))
+            palette.setColor(QPalette.ColorRole.Base, QColor(25, 25, 25))
-            palette.setColor(QPalette.ColorRole.AlternateBase, QColor(35, 35, 35))
+            palette.setColor(QPalette.ColorRole.AlternateBase, QColor(38, 38, 38))
-            palette.setColor(QPalette.ColorRole.ToolTipBase, QColor(255, 255, 255))
+            palette.setColor(QPalette.ColorRole.ToolTipBase, QColor(50, 50, 50))
             palette.setColor(QPalette.ColorRole.ToolTipText, QColor(255, 255, 255))
             palette.setColor(QPalette.ColorRole.Text, QColor(255, 255, 255))
-            palette.setColor(QPalette.ColorRole.Button, QColor(40, 40, 40))
+            palette.setColor(QPalette.ColorRole.Button, QColor(51, 51, 51))
             palette.setColor(QPalette.ColorRole.ButtonText, QColor(255, 255, 255))
             palette.setColor(QPalette.ColorRole.BrightText, QColor(255, 0, 0))
-            palette.setColor(QPalette.ColorRole.Link, QColor(42, 130, 218))
+            palette.setColor(QPalette.ColorRole.Link, QColor(0, 120, 215))
-            palette.setColor(QPalette.ColorRole.Highlight, QColor(42, 130, 218))
+            palette.setColor(QPalette.ColorRole.Highlight, QColor(0, 120, 215))
-            palette.setColor(QPalette.ColorRole.HighlightedText, QColor(0, 0, 0))
+            palette.setColor(QPalette.ColorRole.HighlightedText, QColor(255, 255, 255))
+            palette.setColor(QPalette.ColorRole.Mid, QColor(51, 51, 51))
+            palette.setColor(QPalette.ColorRole.Dark, QColor(25, 25, 25))
+            palette.setColor(QPalette.ColorRole.Shadow, QColor(0, 0, 0))
+            palette.setColor(QPalette.ColorRole.Light, QColor(60, 60, 60))
+            palette.setColor(QPalette.ColorRole.Midlight, QColor(55, 55, 55))
             palette.setColor(QPalette.ColorGroup.Disabled, QPalette.ColorRole.Text, QColor(127, 127, 127))
             palette.setColor(QPalette.ColorGroup.Disabled, QPalette.ColorRole.ButtonText, QColor(127, 127, 127))
             app.setPalette(palette)
+            # Flatten Fusion's 3D look
+            app.setStyleSheet(app.styleSheet() + """
+                QPushButton {
+                    border: 1px solid #555;
+                    border-radius: 2px;
+                    padding: 4px 12px;
+                }
+                QPushButton:hover { background-color: #444; }
+                QPushButton:pressed { background-color: #333; }
+                QComboBox {
+                    border: 1px solid #555;
+                    border-radius: 2px;
+                    padding: 3px 6px;
+                }
+                QSpinBox {
+                    border: 1px solid #555;
+                    border-radius: 2px;
+                }
+                QLineEdit {
+                    border: 1px solid #555;
+                    border-radius: 2px;
+                    padding: 3px;
+                }
+                QScrollBar:vertical {
+                    background: #252525;
+                    width: 12px;
+                }
+                QScrollBar::handle:vertical {
+                    background: #555;
+                    border-radius: 4px;
+                    min-height: 20px;
+                }
+                QScrollBar::add-line:vertical, QScrollBar::sub-line:vertical {
+                    height: 0;
+                }
+            """)
     except Exception:
         pass
 

booru_viewer/gui/preview.py

@@ -23,27 +23,34 @@ def _is_video(path: str) -> bool:
 
 
 class FullscreenPreview(QMainWindow):
-    """Fullscreen image viewer window."""
+    """Fullscreen image viewer window with navigation."""
 
-    def __init__(self, pixmap: QPixmap, info: str = "", parent=None) -> None:
+    navigate = Signal(int)  # -1 = prev, +1 = next
-        super().__init__(parent)
+
+    def __init__(self, parent=None) -> None:
+        super().__init__(parent, Qt.WindowType.Window)
         self.setWindowTitle("booru-viewer — Fullscreen")
-        self._preview = ImageViewer()
+        self._viewer = ImageViewer()
-        self._preview.set_image(pixmap, info)
+        self._viewer.close_requested.connect(self.close)
-        self._preview.close_requested.connect(self.close)
+        self.setCentralWidget(self._viewer)
-        self.setCentralWidget(self._preview)
-        if parent:
-            screen = parent.screen()
-        else:
-            from PySide6.QtWidgets import QApplication
-            screen = QApplication.primaryScreen()
-        if screen:
-            self.setGeometry(screen.geometry())
         self.showFullScreen()
 
+    def set_media(self, path: str, info: str = "") -> None:
+        ext = Path(path).suffix.lower()
+        if ext == ".gif":
+            self._viewer.set_gif(path, info)
+        else:
+            pix = QPixmap(path)
+            if not pix.isNull():
+                self._viewer.set_image(pix, info)
+
     def keyPressEvent(self, event: QKeyEvent) -> None:
-        if event.key() in (Qt.Key.Key_Escape, Qt.Key.Key_Q, Qt.Key.Key_F):
+        if event.key() in (Qt.Key.Key_Escape, Qt.Key.Key_Q):
             self.close()
+        elif event.key() in (Qt.Key.Key_Left, Qt.Key.Key_H):
+            self.navigate.emit(-1)
+        elif event.key() in (Qt.Key.Key_Right, Qt.Key.Key_L):
+            self.navigate.emit(1)
         else:
             super().keyPressEvent(event)
 
@@ -175,6 +182,8 @@ class ImageViewer(QWidget):
         elif event.key() == Qt.Key.Key_Minus:
             self._zoom = max(self._zoom / 1.2, 0.1)
             self.update()
+        else:
+            event.ignore()
 
     def resizeEvent(self, event) -> None:
         if self._pixmap:
@@ -337,6 +346,7 @@ class ImagePreview(QWidget):
     save_to_folder = Signal(str)
     favorite_requested = Signal()
     navigate = Signal(int)  # -1 = prev, +1 = next
+    fullscreen_requested = Signal()
 
     def __init__(self, parent: QWidget | None = None) -> None:
         super().__init__(parent)
@@ -443,6 +453,9 @@ class ImagePreview(QWidget):
         if self._stack.currentIndex() == 0:
             reset_action = menu.addAction("Reset View")
 
+        slideshow_action = None
+        if self._current_path:
+            slideshow_action = menu.addAction("Slideshow Mode")
         clear_action = menu.addAction("Clear Preview")
 
         action = menu.exec(self.mapToGlobal(pos))
@@ -468,6 +481,8 @@ class ImagePreview(QWidget):
         elif action == reset_action:
             self._image_viewer._fit_to_view()
             self._image_viewer.update()
+        elif action == slideshow_action:
+            self.fullscreen_requested.emit()
         elif action == clear_action:
             self.close_requested.emit()
 

booru_viewer/gui/search.py

@@ -43,7 +43,7 @@ class SearchBar(QWidget):
 
         # Save search button
         self._save_btn = QPushButton("Save")
-        self._save_btn.setFixedWidth(40)
+        self._save_btn.setFixedWidth(50)
         self._save_btn.setToolTip("Save current search")
         self._save_btn.clicked.connect(self._save_current_search)
         layout.addWidget(self._save_btn)