Squashed commit of the following:

commit ac941037ff
Author: glubsy <glubsy@users.noreply.github.com>
Date:   Thu Jul 16 22:21:24 2020 +0200

    Fix resize of top frame not updating scaled pixmap

    * Also limit viewing features such as zoom levels when files have different dimensions
    * GraphicsViewImageViewer is still a bit buggy: the scrollbars are toggled on when the pixmap is null in the reference viewer (we do not use that class right anyway)

commit 733b3b0ed4
Author: glubsy <glubsy@users.noreply.github.com>
Date:   Thu Jul 16 01:31:24 2020 +0200

    Prevent zoom for images of differing dimensions

    * If images are not the same size, prevent zooming features from being used by disabling the normal size button, only enable swap

commit 9168d72f38
Author: glubsy <glubsy@users.noreply.github.com>
Date:   Wed Jul 15 22:47:32 2020 +0200

    Update preferences on show(), not in constructor

    * If the dialog window shouldn't have a titlebar during construction, update accordingly only when showing to fix Windows displaying a window without titlebar on first show
    * Only save geometry if the window is floating. Otherwise geometry while docked is saved whih gives weird results on subsequent starts, since it may be floating by default anyway (at least on Linux where titlebar being disabled is allowed while floating)
    * Vertical title bar doesn't seem to work on Windows, add note in preferences dialog

commit 75621cc816
Author: glubsy <glubsy@users.noreply.github.com>
Date:   Wed Jul 15 22:04:19 2020 +0200

    Prevent Windows from floating if no decoration

    * Windows users cannot move a window which has no native decorations. Toggling a dock widget's titlebar off also removes native decorations on a floating window. Until we implement a replacement titlebar by overriding paintEvents, simply force the floating window to go back to docked state after we toggled the titlebar off.

commit 3c816b2f11
Author: glubsy <glubsy@users.noreply.github.com>
Date:   Wed Jul 15 21:43:01 2020 +0200

    Fix computing and setting offset to 0 for tableview

commit 85d6e05cd4
Merge: 66127d02 3eddeb6a
Author: glubsy <glubsy@users.noreply.github.com>
Date:   Wed Jul 15 21:25:44 2020 +0200

    Merge branch 'dockable_windows' into details_dialog_improvements_dev

commit 66127d025e
Author: glubsy <glubsy@users.noreply.github.com>
Date:   Wed Jul 15 20:22:13 2020 +0200

    Add credit for icons used, upscale exchange icon

    * Jason Cho gave his express permission to use the icon (it was made 10 years ago and he doesn't have the source files anymore)
    * Used waifu2x to upscale the icon
    * Used GIMP to draw dark outline around the icon
    * Source files are included

commit 58c675d1fa
Author: glubsy <glubsy@users.noreply.github.com>
Date:   Wed Jul 15 05:25:47 2020 +0200

    Add custom icons

    * Use custom icons on platforms which do not provide theme
    * Old zoom icons credits to "schollidesign" from icon pack Office and Entertainment (GPL licence).
    * Exchange icon credit to Jason Cho (Unknown license).
    * Use hack to resize viewers on first show() as well

commit 95b8406c7b
Author: glubsy <glubsy@users.noreply.github.com>
Date:   Wed Jul 15 04:14:24 2020 +0200

    Fix scrollbar displayed while splitter maxed out

    * For some reason the table's height is a few pixel longer on Windows so we work around the issue by adding a small offset to the maximum height hint.
    * No idea about MacOS yet but this might need the same treatment.

commit 3eddeb6aeb
Author: glubsy <glubsy@users.noreply.github.com>
Date:   Tue Jul 14 17:37:48 2020 +0200

    Fix ME/SE details dialogs, add preferences

    * Fix ME and SE versions of details dialog not displaying their content properly after change to QDockWidget
    * Add option to toggle titlebar and orientation of titlebar in preferences dialog
    * Fix setting layout on PE details dialog window while layout already set, by removing the self (parent) reference in constructing the QSplitter

commit 56912a7108
Author: glubsy <glubsy@users.noreply.github.com>
Date:   Mon Jul 13 05:06:04 2020 +0200

    Make details dialog dockable

qt/app.py

@@ -7,7 +7,7 @@
 import sys
 import os.path as op
 
-from PyQt5.QtCore import QTimer, QObject, QUrl, pyqtSignal
+from PyQt5.QtCore import QTimer, QObject, QUrl, pyqtSignal, Qt
 from PyQt5.QtGui import QDesktopServices
 from PyQt5.QtWidgets import QApplication, QFileDialog, QDialog, QMessageBox
 
@@ -54,11 +54,11 @@ class DupeGuru(QObject):
     def _setup(self):
         core.pe.photo.PLAT_SPECIFIC_PHOTO_CLASS = PlatSpecificPhoto
         self._setupActions()
+        self.details_dialog = None
         self._update_options()
         self.recentResults = Recent(self, "recentResults")
         self.recentResults.mustOpenItem.connect(self.model.load_from)
         self.resultWindow = None
-        self.details_dialog = None
         self.directories_dialog = DirectoriesDialog(self)
         self.progress_window = ProgressWindow(
             self.directories_dialog, self.model.progress_window
@@ -152,6 +152,9 @@ class DupeGuru(QObject):
         self.model.options["match_scaled"] = self.prefs.match_scaled
         self.model.options["picture_cache_type"] = self.prefs.picture_cache_type
 
+        if self.details_dialog:
+            self.details_dialog.update_options()
+
     # --- Private
     def _get_details_dialog_class(self):
         if self.model.app_mode == AppMode.Picture:
@@ -284,6 +287,8 @@ class DupeGuru(QObject):
             self.resultWindow.setParent(None)
         self.resultWindow = ResultWindow(self.directories_dialog, self)
         self.details_dialog = self._get_details_dialog_class()(self.resultWindow, self)
+        self.resultWindow.addDockWidget(
+            Qt.BottomDockWidgetArea, self.details_dialog)
 
     def show_results_window(self):
         self.showResultsWindow()

qt/details_dialog.py

@@ -7,16 +7,19 @@
 # http://www.gnu.org/licenses/gpl-3.0.html
 
 from PyQt5.QtCore import Qt
-from PyQt5.QtWidgets import QMainWindow
+from PyQt5.QtWidgets import QDockWidget, QWidget
 
 from .details_table import DetailsModel
+from hscommon.plat import ISLINUX
 
 
-class DetailsDialog(QMainWindow):
+class DetailsDialog(QDockWidget):
     def __init__(self, parent, app, **kwargs):
         super().__init__(parent, Qt.Tool, **kwargs)
+        self.parent = parent
         self.app = app
         self.model = app.model.details_panel
+        self.setAllowedAreas(Qt.AllDockWidgetAreas)
         self._setupUi()
         # To avoid saving uninitialized geometry on appWillSavePrefs, we track whether our dialog
         # has been shown. If it has, we know that our geometry should be saved.
@@ -35,10 +38,31 @@ class DetailsDialog(QMainWindow):
     def show(self):
         self._shown_once = True
         super().show()
+        self.update_options()
+
+    def update_options(self):
+        # This disables the title bar (if we had not set one before already)
+        # essentially making it a simple floating window, not dockable anymore
+        if not self.app.prefs.details_dialog_titlebar_enabled \
+                and not self.titleBarWidget():
+            self.setTitleBarWidget(QWidget())
+            # Windows (and MacOS?) users cannot move a floating window which
+            # has not native decoration so we force it to dock for now
+            if not ISLINUX:
+                self.setFloating(False)
+        elif self.titleBarWidget() is not None:
+            # resets to the default title bar
+            self.setTitleBarWidget(None)
+
+        features = self.features()
+        if self.app.prefs.details_dialog_vertical_titlebar:
+            self.setFeatures(features | QDockWidget.DockWidgetVerticalTitleBar)
+        elif features & QDockWidget.DockWidgetVerticalTitleBar:
+            self.setFeatures(features ^ QDockWidget.DockWidgetVerticalTitleBar)
 
     # --- Events
     def appWillSavePrefs(self):
-        if self._shown_once:
+        if self._shown_once and self.isFloating():
             self.app.prefs.saveGeometry("DetailsWindowRect", self)
 
     # --- model --> view

qt/dg.qrc

@@ -5,5 +5,10 @@
     <file alias="plus">../images/plus_8.png</file>
     <file alias="minus">../images/minus_8.png</file>
     <file alias="search_clear_13">../qtlib/images/search_clear_13.png</file>
+    <file alias="exchange">../images/exchange_purple_upscaled.png</file>
+    <file alias="zoom_in">../images/old_zoom_in.png</file>
+    <file alias="zoom_out">../images/old_zoom_out.png</file>
+    <file alias="zoom_original">../images/old_zoom_original.png</file>
+    <file alias="zoom_best_fit">../images/old_zoom_best_fit.png</file>
 </qresource>
 </RCC>

qt/me/details_dialog.py

@@ -5,7 +5,7 @@
 # http://www.gnu.org/licenses/gpl-3.0.html
 
 from PyQt5.QtCore import QSize
-from PyQt5.QtWidgets import QVBoxLayout, QAbstractItemView
+from PyQt5.QtWidgets import QVBoxLayout, QAbstractItemView, QWidget
 
 from hscommon.trans import trget
 from ..details_dialog import DetailsDialog as DetailsDialogBase
@@ -27,3 +27,6 @@ class DetailsDialog(DetailsDialogBase):
         self.tableView.setSelectionBehavior(QAbstractItemView.SelectRows)
         self.tableView.setShowGrid(False)
         self.verticalLayout.addWidget(self.tableView)
+        self.centralWidget = QWidget()
+        self.centralWidget.setLayout(self.verticalLayout)
+        self.setWidget(self.centralWidget)

qt/pe/details_dialog.py

@@ -4,11 +4,12 @@
 # which should be included with this package. The terms are also available at
 # http://www.gnu.org/licenses/gpl-3.0.html
 
-from PyQt5.QtCore import Qt, QSize
+from PyQt5.QtCore import Qt, QSize, pyqtSignal, pyqtSlot
 from PyQt5.QtWidgets import (
     QAbstractItemView, QSizePolicy, QGridLayout, QSplitter, QFrame)
-
+from PyQt5.QtGui import QResizeEvent
 from hscommon.trans import trget
+from hscommon.plat import ISWINDOWS
 from ..details_dialog import DetailsDialog as DetailsDialogBase
 from ..details_table import DetailsTable
 from .image_viewer import (
@@ -25,9 +26,8 @@ class DetailsDialog(DetailsDialogBase):
         self.setWindowTitle(tr("Details"))
         self.resize(502, 502)
         self.setMinimumSize(QSize(250, 250))
-        self.splitter = QSplitter(Qt.Vertical, self)
+        self.splitter = QSplitter(Qt.Vertical)
-        self.setCentralWidget(self.splitter)
+        self.topFrame = EmittingFrame()
-        self.topFrame = QFrame()
         self.topFrame.setFrameShape(QFrame.StyledPanel)
         self.horizontalLayout = QGridLayout()
         # Minimum width for the toolbar in the middle:
@@ -73,6 +73,10 @@ class DetailsDialog(DetailsDialogBase):
         # Late population needed here for connections to the toolbar
         self.vController.setupViewers(
             self.selectedImageViewer, self.referenceImageViewer)
+        # self.setCentralWidget(self.splitter)  # only as QMainWindow
+        self.setWidget(self.splitter)  # only as QDockWidget
+
+        self.topFrame.resized.connect(self.resizeEvent)
 
     def _update(self):
         if self.vController is None:  # Not yet constructed!
@@ -88,24 +92,9 @@ class DetailsDialog(DetailsDialogBase):
         self.vController.updateView(ref, dupe, group)
 
     # --- Override
+    @pyqtSlot(QResizeEvent)
     def resizeEvent(self, event):
-        # HACK referenceViewer might be 1 pixel shorter in width
+        self.ensure_same_sizes()
-        # due to the toolbar in the middle keeping the same width,
-        # so resizing in the GridLayout's engine leads to not enough space
-        # left for the panel on the right.
-        # This ensures same size while shrinking at least:
-        self.horizontalLayout.setColumnMinimumWidth(
-            0, self.selectedImageViewer.size().width())
-        self.horizontalLayout.setColumnMinimumWidth(
-            2, self.selectedImageViewer.size().width())
-        # This works when expanding but it's ugly:
-        if self.selectedImageViewer.size().width() > self.referenceImageViewer.size().width():
-            # print(f"""Before selected size: {self.selectedImageViewer.size()}\n""",
-            #       f"""Before reference size: {self.referenceImageViewer.size()}""")
-            self.selectedImageViewer.resize(self.referenceImageViewer.size())
-            # print(f"""After selected size: {self.selectedImageViewer.size()}\n""",
-            #       f"""After reference size: {self.referenceImageViewer.size()}""")
-
         if self.vController is None or not self.vController.bestFit:
             return
         # Only update the scaled down pixmaps
@@ -117,12 +106,44 @@ class DetailsDialog(DetailsDialogBase):
         self.tableView.setMaximumHeight(
             self.tableView.rowHeight(1)
             * self.tableModel.model.row_count()
-            + self.tableView.verticalHeader().sectionSize(0))
+            + self.tableView.verticalHeader().sectionSize(0)
+            # Windows seems to add a few pixels more to the table somehow
+            + (5 if ISWINDOWS else 0))
         DetailsDialogBase.show(self)
+        self.ensure_same_sizes()
         self._update()
 
+    def ensure_same_sizes(self):
+        # HACK This ensures same size while shrinking.
+        # ReferenceViewer might be 1 pixel shorter in width
+        # due to the toolbar in the middle keeping the same width,
+        # so resizing in the GridLayout's engine leads to not enough space
+        # left for the panel on the right.
+        # This work as a QMainWindow, but doesn't work as a QDockWidget:
+        # resize can only grow. Might need some custom sizeHint somewhere...
+        # self.horizontalLayout.setColumnMinimumWidth(
+        #     0, self.selectedImageViewer.size().width())
+        # self.horizontalLayout.setColumnMinimumWidth(
+        #     2, self.selectedImageViewer.size().width())
+
+        # This works when expanding but it's ugly:
+        if self.selectedImageViewer.size().width() > self.referenceImageViewer.size().width():
+            # print(f"""Before selected size: {self.selectedImageViewer.size()}\n""",
+            #       f"""Before reference size: {self.referenceImageViewer.size()}""")
+            self.selectedImageViewer.resize(self.referenceImageViewer.size())
+            # print(f"""After selected size: {self.selectedImageViewer.size()}\n""",
+            #       f"""After reference size: {self.referenceImageViewer.size()}""")
+
     # model --> view
     def refresh(self):
         DetailsDialogBase.refresh(self)
         if self.isVisible():
             self._update()
+
+
+class EmittingFrame(QFrame):
+    """Emits a signal whenever is resized"""
+    resized = pyqtSignal(QResizeEvent)
+
+    def resizeEvent(self, event):
+        self.resized.emit(event)

qt/pe/image_viewer.py

@@ -10,6 +10,7 @@ from PyQt5.QtWidgets import (
     QToolBar, QToolButton, QAction, QWidget, QScrollArea,
     QApplication, QAbstractScrollArea, QStyle)
 from hscommon.trans import trget
+from hscommon.plat import ISLINUX
 tr = trget("ui")
 
 MAX_SCALE = 12.0
@@ -21,7 +22,7 @@ def createActions(actions, target):
     for name, shortcut, icon, desc, func in actions:
         action = QAction(target)
         if icon:
-            action.setIcon(QIcon.fromTheme(icon))
+            action.setIcon(icon)
         if shortcut:
             action.setShortcut(shortcut)
         action.setText(desc)
@@ -48,28 +49,32 @@ class ViewerToolBar(QToolBar):
             (
                 "actionZoomIn",
                 QKeySequence.ZoomIn,
-                "zoom-in",
+                QIcon.fromTheme("zoom-in") if ISLINUX
+                else QIcon(QPixmap(":/" + "zoom_in")),
                 tr("Increase zoom"),
                 controller.zoomIn,
             ),
             (
                 "actionZoomOut",
                 QKeySequence.ZoomOut,
-                "zoom-out",
+                QIcon.fromTheme("zoom-out") if ISLINUX
+                else QIcon(QPixmap(":/" + "zoom_out")),
                 tr("Decrease zoom"),
                 controller.zoomOut,
             ),
             (
                 "actionNormalSize",
                 tr("Ctrl+/"),
-                "zoom-original",
+                QIcon.fromTheme("zoom-original") if ISLINUX
+                else QIcon(QPixmap(":/" + "zoom_original")),
                 tr("Normal size"),
                 controller.zoomNormalSize,
             ),
             (
                 "actionBestFit",
                 tr("Ctrl+*"),
-                "zoom-best-fit",
+                QIcon.fromTheme("zoom-best-fit") if ISLINUX
+                else QIcon(QPixmap(":/" + "zoom_best_fit")),
                 tr("Best fit"),
                 controller.zoomBestFit,
             )
@@ -83,7 +88,9 @@ class ViewerToolBar(QToolBar):
         self.buttonImgSwap.setToolButtonStyle(Qt.ToolButtonIconOnly)
         self.buttonImgSwap.setIcon(
             QIcon.fromTheme('view-refresh',
-                            self.style().standardIcon(QStyle.SP_BrowserReload)))
+                            self.style().standardIcon(QStyle.SP_BrowserReload))
+            if ISLINUX
+            else QIcon(QPixmap(":/" + "exchange")))
         self.buttonImgSwap.setText('Swap images')
         self.buttonImgSwap.setToolTip('Swap images')
         self.buttonImgSwap.pressed.connect(self.controller.swapImages)
@@ -142,6 +149,7 @@ class BaseController(QObject):
         self.bestFit = True
         self.parent = parent  # To change buttons' states
         self.cached_group = None
+        self.same_dimensions = True
 
     def setupViewers(self, selectedViewer, referenceViewer):
         self.selectedViewer = selectedViewer
@@ -156,6 +164,8 @@ class BaseController(QObject):
 
     def updateView(self, ref, dupe, group):
         # To keep current scale accross dupes from the same group
+        previous_same_dimensions = self.same_dimensions
+        self.same_dimensions = True
         same_group = True
         if group != self.cached_group:
             same_group = False
@@ -164,6 +174,7 @@ class BaseController(QObject):
 
         self.selectedPixmap = QPixmap(str(dupe.path))
         if ref is dupe:  # currently selected file is the actual reference file
+            # self.same_dimensions = False
             self.referencePixmap = QPixmap()
             self.scaledReferencePixmap = QPixmap()
             self.parent.verticalToolBar.buttonImgSwap.setEnabled(False)
@@ -171,7 +182,10 @@ class BaseController(QObject):
         else:
             self.referencePixmap = QPixmap(str(ref.path))
             self.parent.verticalToolBar.buttonImgSwap.setEnabled(True)
+            if ref.dimensions != dupe.dimensions:
+                self.same_dimensions = False
             self.parent.verticalToolBar.buttonNormalSize.setEnabled(True)
+        self.updateButtonsAsPerDimensions(previous_same_dimensions)
         self.updateBothImages(same_group)
         self.centerViews(same_group and self.referencePixmap.isNull())
 
@@ -207,11 +221,11 @@ class BaseController(QObject):
             # zoomed in state, expand
             # only if not same_group, we need full update
             scaledpixmap = pixmap.scaled(
-                target_size, Qt.KeepAspectRatioByExpanding, Qt.SmoothTransformation)
+                target_size, Qt.KeepAspectRatioByExpanding, Qt.FastTransformation)
         else:
             # best fit, keep ratio always
             scaledpixmap = pixmap.scaled(
-                target_size, Qt.KeepAspectRatio, Qt.SmoothTransformation)
+                target_size, Qt.KeepAspectRatio, Qt.FastTransformation)
         viewer.setImage(scaledpixmap)
         return target_size
 
@@ -294,6 +308,22 @@ class BaseController(QObject):
         self.parent.verticalToolBar.buttonNormalSize.setEnabled(round(self.current_scale, 1) != 1.0)
         self.parent.verticalToolBar.buttonBestFit.setEnabled(self.bestFit is False)
 
+    def updateButtonsAsPerDimensions(self, previous_same_dimensions):
+        if not self.same_dimensions:
+            self.parent.verticalToolBar.buttonZoomIn.setEnabled(False)
+            self.parent.verticalToolBar.buttonZoomOut.setEnabled(False)
+            if not self.bestFit:
+                self.zoomBestFit()
+                self.parent.verticalToolBar.buttonNormalSize.setEnabled(True)
+                if not self.referencePixmap.isNull():
+                    self.parent.verticalToolBar.buttonImgSwap.setEnabled(True)
+            return
+        if not self.bestFit and not previous_same_dimensions:
+            self.zoomBestFit()
+            self.parent.verticalToolBar.buttonNormalSize.setEnabled(True)
+            if self.referencePixmap.isNull():
+                self.parent.verticalToolBar.buttonImgSwap.setEnabled(False)
+
     @pyqtSlot()
     def zoomBestFit(self):
         """Setup before scaling to bestfit"""
@@ -320,6 +350,7 @@ class BaseController(QObject):
         self.parent.verticalToolBar.buttonZoomOut.setEnabled(False)
         self.parent.verticalToolBar.buttonNormalSize.setEnabled(True)
         self.parent.verticalToolBar.buttonBestFit.setEnabled(False)
+        self.parent.verticalToolBar.buttonImgSwap.setEnabled(True)
 
     def setBestFit(self, value):
         self.bestFit = value
@@ -339,8 +370,12 @@ class BaseController(QObject):
         self.selectedViewer.scaleToNormalSize()
         self.referenceViewer.scaleToNormalSize()
 
-        self.parent.verticalToolBar.buttonZoomIn.setEnabled(True)
+        if self.same_dimensions:
-        self.parent.verticalToolBar.buttonZoomOut.setEnabled(True)
+            self.parent.verticalToolBar.buttonZoomIn.setEnabled(True)
+            self.parent.verticalToolBar.buttonZoomOut.setEnabled(True)
+        else:
+            # we can't allow swapping pixmaps of different dimensions
+            self.parent.verticalToolBar.buttonImgSwap.setEnabled(False)
         self.parent.verticalToolBar.buttonNormalSize.setEnabled(False)
         self.parent.verticalToolBar.buttonBestFit.setEnabled(True)
 
@@ -361,8 +396,16 @@ class QWidgetController(BaseController):
     def __init__(self, parent):
         super().__init__(parent)
 
+    def _updateImage(self, *args):
+        ret = super()._updateImage(*args)
+        # Fix alignment when resizing window
+        self.centerViews()
+        return ret
+
     @pyqtSlot(QPointF)
     def onDraggedMouse(self, delta):
+        if not self.same_dimensions:
+            return
         if self.sender() is self.referenceViewer:
             self.selectedViewer.onDraggedMouse(delta)
         else:
@@ -400,8 +443,14 @@ class ScrollAreaController(BaseController):
         self.selectedViewer.ignore_signal = True
         self.referenceViewer.ignore_signal = True
 
-        self.selectedViewer.onDraggedMouse(delta)
+        if self.same_dimensions:
-        self.referenceViewer.onDraggedMouse(delta)
+            self.selectedViewer.onDraggedMouse(delta)
+            self.referenceViewer.onDraggedMouse(delta)
+        else:
+            if self.sender() is self.selectedViewer:
+                self.selectedViewer.onDraggedMouse(delta)
+            else:
+                self.referenceViewer.onDraggedMouse(delta)
 
         self.selectedViewer.ignore_signal = False
         self.referenceViewer.ignore_signal = False
@@ -422,6 +471,8 @@ class ScrollAreaController(BaseController):
 
     @pyqtSlot(int)
     def onVScrollBarChanged(self, value):
+        if not self.same_dimensions:
+            return
         if self.sender() is self.referenceViewer._verticalScrollBar:
             if not self.selectedViewer.ignore_signal:
                 self.selectedViewer._verticalScrollBar.setValue(value)
@@ -431,6 +482,8 @@ class ScrollAreaController(BaseController):
 
     @pyqtSlot(int)
     def onHScrollBarChanged(self, value):
+        if not self.same_dimensions:
+            return
         if self.sender() is self.referenceViewer._horizontalScrollBar:
             if not self.selectedViewer.ignore_signal:
                 self.selectedViewer._horizontalScrollBar.setValue(value)
@@ -448,6 +501,8 @@ class ScrollAreaController(BaseController):
     def zoomBestFit(self):
         # Disable scrollbars to avoid GridLayout size rounding glitch
         super().zoomBestFit()
+        if self.referencePixmap.isNull():
+            self.parent.verticalToolBar.buttonImgSwap.setEnabled(False)
         self.selectedViewer.toggleScrollBars()
         self.referenceViewer.toggleScrollBars()
 
@@ -484,6 +539,8 @@ class GraphicsViewController(BaseController):
 
     @pyqtSlot(int)
     def onVScrollBarChanged(self, value):
+        if not self.same_dimensions:
+            return
         if self.sender() is self.referenceViewer._verticalScrollBar:
             if not self.selectedViewer.ignore_signal:
                 self.selectedViewer._verticalScrollBar.setValue(value)
@@ -493,6 +550,8 @@ class GraphicsViewController(BaseController):
 
     @pyqtSlot(int)
     def onHScrollBarChanged(self, value):
+        if not self.same_dimensions:
+            return
         if self.sender() is self.referenceViewer._horizontalScrollBar:
             if not self.selectedViewer.ignore_signal:
                 self.selectedViewer._horizontalScrollBar.setValue(value)
@@ -518,9 +577,16 @@ class GraphicsViewController(BaseController):
         self.parent.verticalToolBar.buttonZoomOut.setEnabled(False)
         self.parent.verticalToolBar.buttonZoomIn.setEnabled(False)
         self.parent.verticalToolBar.buttonNormalSize.setEnabled(True)
+        if not self.referencePixmap.isNull():
+            self.parent.verticalToolBar.buttonImgSwap.setEnabled(True)
+        # else:
+        #     self.referenceViewer.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
+        #     self.referenceViewer.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
 
     def updateView(self, ref, dupe, group):
         # Keep current scale accross dupes from the same group
+        previous_same_dimensions = self.same_dimensions
+        self.same_dimensions = True
         same_group = True
         if group != self.cached_group:
             same_group = False
@@ -529,16 +595,19 @@ class GraphicsViewController(BaseController):
 
         self.selectedPixmap = QPixmap(str(dupe.path))
         if ref is dupe:  # currently selected file is the actual reference file
+            self.same_dimensions = False
             self.referencePixmap = QPixmap()
             self.parent.verticalToolBar.buttonImgSwap.setEnabled(False)
             self.parent.verticalToolBar.buttonNormalSize.setEnabled(True)
         else:
             self.referencePixmap = QPixmap(str(ref.path))
             self.parent.verticalToolBar.buttonImgSwap.setEnabled(True)
+            if ref.dimensions != dupe.dimensions:
+                self.same_dimensions = False
             self.parent.verticalToolBar.buttonNormalSize.setEnabled(True)
-
+        # self.selectedViewer.setImage(self.selectedPixmap)
-        self.selectedViewer.setImage(self.selectedPixmap)
+        # self.referenceViewer.setImage(self.referencePixmap)
-        self.referenceViewer.setImage(self.referencePixmap)
+        self.updateButtonsAsPerDimensions(previous_same_dimensions)
         self.updateBothImages(same_group)
 
     def updateBothImages(self, same_group=False):
@@ -557,7 +626,9 @@ class GraphicsViewController(BaseController):
 
     def _updateFitImage(self, pixmap, viewer):
         # If not same_group, we need full update"""
+        viewer.setImage(pixmap)
         if pixmap.isNull():
+            # viewer._item = None
             return
         if viewer.bestFit:
             viewer.fitScale()
@@ -717,7 +788,7 @@ class QWidgetImageViewer(QWidget):
         self.setMouseTracking(False)
 
     def wheelEvent(self, event):
-        if self.bestFit or not self.isEnabled():
+        if self.bestFit or not self.controller.same_dimensions or not self.isEnabled():
             event.ignore()
             return
 
@@ -910,7 +981,7 @@ class ScrollAreaImageViewer(QScrollArea):
         super().mouseReleaseEvent(event)
 
     def wheelEvent(self, event):
-        if self.bestFit:
+        if self.bestFit or not self.controller.same_dimensions:
             event.ignore()
             return
         oldScale = self.current_scale
@@ -1034,7 +1105,7 @@ class ScrollAreaImageViewer(QScrollArea):
 
 
 class GraphicsViewViewer(QGraphicsView):
-    """Re-Implementation using a more full fledged class."""
+    """Re-Implementation a full-fledged GraphicsView but is a bit buggy."""
     mouseDragged = pyqtSignal()
     mouseWheeled = pyqtSignal(float, QPointF)
 
@@ -1163,7 +1234,7 @@ class GraphicsViewViewer(QGraphicsView):
         self._centerPoint = self.mapToScene(self.rect().center())
 
     def wheelEvent(self, event):
-        if self.bestFit or MIN_SCALE > self.current_scale > MAX_SCALE:
+        if self.bestFit or MIN_SCALE > self.current_scale > MAX_SCALE or not self.controller.same_dimensions:
             event.ignore()
             return
         pointBeforeScale = QPointF(self.mapToScene(self.mapFromGlobal(QCursor.pos())))
@@ -1186,6 +1257,10 @@ class GraphicsViewViewer(QGraphicsView):
         self.other_viewer.ignore_signal = False
 
     def setImage(self, pixmap):
+        if pixmap.isNull():
+            self.ignore_signal = True
+        elif self.ignore_signal:
+            self.ignore_signal = False
         self._pixmap = pixmap
         self._item.setPixmap(pixmap)
         self.translate(1, 1)
@@ -1241,7 +1316,7 @@ class GraphicsViewViewer(QGraphicsView):
         """Called when the pixmap is set back to original size."""
         self.bestFit = False
         self.scaleAt(1.0)
-        self.toggleScrollBars()
+        self.toggleScrollBars(True)
         self.update()
 
     def adjustScrollBarsScaled(self, delta):

qt/preferences.py

@@ -31,6 +31,8 @@ class Preferences(PreferencesBase):
 
         self.tableFontSize = get("TableFontSize", self.tableFontSize)
         self.reference_bold_font = get('ReferenceBoldFont', self.reference_bold_font)
+        self.details_dialog_titlebar_enabled = get('DetailsDialogTitleBarEnabled', self.details_dialog_titlebar_enabled)
+        self.details_dialog_vertical_titlebar = get('DetailsDialogVerticalTitleBar', self.details_dialog_vertical_titlebar)
         self.resultWindowIsMaximized = get(
             "ResultWindowIsMaximized", self.resultWindowIsMaximized
         )
@@ -67,6 +69,8 @@ class Preferences(PreferencesBase):
 
         self.tableFontSize = QApplication.font().pointSize()
         self.reference_bold_font = True
+        self.details_dialog_titlebar_enabled = True
+        self.details_dialog_vertical_titlebar = True
         self.resultWindowIsMaximized = False
         self.resultWindowRect = None
         self.directoriesWindowRect = None
@@ -100,6 +104,8 @@ class Preferences(PreferencesBase):
 
         set_("TableFontSize", self.tableFontSize)
         set_('ReferenceBoldFont', self.reference_bold_font)
+        set_('DetailsDialogTitleBarEnabled', self.details_dialog_titlebar_enabled)
+        set_('DetailsDialogVerticalTitleBar', self.details_dialog_vertical_titlebar)
         set_("ResultWindowIsMaximized", self.resultWindowIsMaximized)
         self.set_rect("ResultWindowRect", self.resultWindowRect)
         self.set_rect("DirectoriesWindowRect", self.directoriesWindowRect)

qt/preferences_dialog.py

@@ -117,8 +117,21 @@ class PreferencesDialogBase(QDialog):
         self.widgetsVLayout.addLayout(
             horizontalWrap([self.fontSizeLabel, self.fontSizeSpinBox, None])
         )
-        self._setupAddCheckbox("reference_bold_font", tr("Bold font for reference."))
+        self._setupAddCheckbox("reference_bold_font",
+                               tr("Bold font for reference"))
         self.widgetsVLayout.addWidget(self.reference_bold_font)
+
+        self._setupAddCheckbox("details_dialog_titlebar_enabled",
+                               tr("Details dialog displays a title bar and is dockable"))
+        self.widgetsVLayout.addWidget(self.details_dialog_titlebar_enabled)
+        self._setupAddCheckbox("details_dialog_vertical_titlebar",
+                               tr("Details dialog displays a vertical title bar (Linux only)"))
+        self.widgetsVLayout.addWidget(self.details_dialog_vertical_titlebar)
+        self.details_dialog_vertical_titlebar.setEnabled(
+            self.details_dialog_titlebar_enabled.isChecked())
+        self.details_dialog_titlebar_enabled.stateChanged.connect(
+            self.details_dialog_vertical_titlebar.setEnabled)
+
         self.languageLabel = QLabel(tr("Language:"), self)
         self.languageComboBox = QComboBox(self)
         for lang in self.supportedLanguages:
@@ -190,6 +203,8 @@ class PreferencesDialogBase(QDialog):
         setchecked(self.ignoreHardlinkMatches, prefs.ignore_hardlink_matches)
         setchecked(self.debugModeBox, prefs.debug_mode)
         setchecked(self.reference_bold_font, prefs.reference_bold_font)
+        setchecked(self.details_dialog_titlebar_enabled , prefs.details_dialog_titlebar_enabled)
+        setchecked(self.details_dialog_vertical_titlebar, prefs.details_dialog_vertical_titlebar)
         self.copyMoveDestinationComboBox.setCurrentIndex(prefs.destination_type)
         self.customCommandEdit.setText(prefs.custom_command)
         self.fontSizeSpinBox.setValue(prefs.tableFontSize)
@@ -210,6 +225,8 @@ class PreferencesDialogBase(QDialog):
         prefs.ignore_hardlink_matches = ischecked(self.ignoreHardlinkMatches)
         prefs.debug_mode = ischecked(self.debugModeBox)
         prefs.reference_bold_font = ischecked(self.reference_bold_font)
+        prefs.details_dialog_titlebar_enabled = ischecked(self.details_dialog_titlebar_enabled)
+        prefs.details_dialog_vertical_titlebar = ischecked(self.details_dialog_vertical_titlebar)
         prefs.destination_type = self.copyMoveDestinationComboBox.currentIndex()
         prefs.custom_command = str(self.customCommandEdit.text())
         prefs.tableFontSize = self.fontSizeSpinBox.value()

qt/se/details_dialog.py

@@ -5,7 +5,7 @@
 # http://www.gnu.org/licenses/gpl-3.0.html
 
 from PyQt5.QtCore import QSize
-from PyQt5.QtWidgets import QVBoxLayout, QAbstractItemView
+from PyQt5.QtWidgets import QVBoxLayout, QAbstractItemView, QWidget
 
 from hscommon.trans import trget
 from ..details_dialog import DetailsDialog as DetailsDialogBase
@@ -27,3 +27,6 @@ class DetailsDialog(DetailsDialogBase):
         self.tableView.setSelectionBehavior(QAbstractItemView.SelectRows)
         self.tableView.setShowGrid(False)
         self.verticalLayout.addWidget(self.tableView)
+        self.centralWidget = QWidget()
+        self.centralWidget.setLayout(self.verticalLayout)
+        self.setWidget(self.centralWidget)

qtlib/about_box.py

@@ -42,7 +42,7 @@ class AboutBox(QDialog):
         self.setWindowTitle(
             tr("About {}").format(QCoreApplication.instance().applicationName())
         )
-        self.resize(400, 190)
+        self.resize(400, 290)
         sizePolicy = QSizePolicy(QSizePolicy.Fixed, QSizePolicy.Fixed)
         sizePolicy.setHorizontalStretch(0)
         sizePolicy.setVerticalStretch(0)
@@ -69,6 +69,21 @@ class AboutBox(QDialog):
         self.verticalLayout.addWidget(self.label_3)
         self.label_3.setText(tr("Licensed under GPLv3"))
         self.label = QLabel(self)
+        self.label_4 = QLabel(self)
+        self.label_4.setWordWrap(True)
+        self.label_4.setTextFormat(Qt.RichText)
+        self.label_4.setOpenExternalLinks(True)
+        self.label_4.setText(tr(
+            """<img src=":/exchange" alt="Exchange" width="16" height="16"> icon
+ made by <a href="http://jasoncho.ca/"> Jason Cho</a> (used with permission).
+<br>
+<img src=":/zoom_in" alt="Zoom In" width="16" height="16">
+<img src=":/zoom_out" alt="Zoom Out" width="16" height="16">
+<img src=":/zoom_best_fit" alt="Zoomt Best Fit" width="16" height="16">
+<img src=":/zoom_original" alt="Zoom Original" width="16" height="16">
+ icons made by <a href="https://findicons.com/pack/1035/human_o2">schollidesign</a>
+ (licensed under GPL)."""))
+        self.verticalLayout.addWidget(self.label_4)
         font = QFont()
         font.setWeight(75)
         font.setBold(True)