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

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.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/pe/details_dialog.py

@@ -90,23 +90,7 @@ def _update(self):
 
     # --- Override
     def resizeEvent(self, event):
-        # HACK 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 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()}""")
-
+        self.ensure_same_sizes()
         if self.vController is None or not self.vController.bestFit:
             return
         # Only update the scaled down pixmaps
@@ -122,8 +106,28 @@ def show(self):
             # 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 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 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()}""")
+
     # model --> view
     def refresh(self):
         DetailsDialogBase.refresh(self)

qt/pe/image_viewer.py

@@ -10,6 +10,7 @@
     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 @@ def setupActions(self, controller):
             (
                 "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 @@ def createButtons(self):
         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)