Viewer: Allow copying images by right clicking on them. Fixes #1846903 [Right Click Copy Image v 4](https://bugs.launchpad.net/calibre/+bug/1846903)

src/calibre/gui2/viewer/ui.py

@@ -12,8 +12,8 @@ from hashlib import sha256
 from threading import Thread
 
 from PyQt5.Qt import (
-    QDockWidget, QEvent, QModelIndex, QPixmap, Qt, QUrl, QVBoxLayout, QWidget,
-    pyqtSignal
+    QApplication, QDockWidget, QEvent, QMimeData, QModelIndex, QPixmap, Qt, QUrl,
+    QVBoxLayout, QWidget, pyqtSignal
 )
 
 from calibre import prints
@@ -33,6 +33,7 @@ from calibre.gui2.viewer.web_view import (
     vprefs
 )
 from calibre.utils.date import utcnow
+from calibre.utils.img import image_from_path
 from calibre.utils.ipc.simple_worker import WorkerError
 from calibre.utils.serialize import json_loads
 from polyglot.builtins import as_bytes, itervalues
@@ -125,6 +126,7 @@ class EbookViewer(MainWindow):
         self.web_view.ask_for_open.connect(self.ask_for_open, type=Qt.QueuedConnection)
         self.web_view.selection_changed.connect(self.lookup_widget.selected_text_changed, type=Qt.QueuedConnection)
         self.web_view.view_image.connect(self.view_image, type=Qt.QueuedConnection)
+        self.web_view.copy_image.connect(self.copy_image, type=Qt.QueuedConnection)
         self.setCentralWidget(self.web_view)
         self.restore_state()
         if continue_reading:
@@ -213,6 +215,22 @@ class EbookViewer(MainWindow):
         else:
             error_dialog(self, _('Image not found'), _(
                     "Failed to find the image {}").format(name), show=True)
+
+    def copy_image(self, name):
+        path = get_path_for_name(name)
+        if not path:
+            return error_dialog(self, _('Image not found'), _(
+                "Failed to find the image {}").format(name), show=True)
+        try:
+            img = image_from_path(path)
+        except Exception:
+            return error_dialog(self, _('Invalid image'), _(
+                "Failed to load the image {}").format(name), show=True)
+        url = QUrl.fromLocalFile(path)
+        md = QMimeData()
+        md.setImageData(img)
+        md.setUrls([url])
+        QApplication.instance().clipboard().setMimeData(md)
     # }}}
 
     # Load book {{{

src/calibre/gui2/viewer/web_view.py

@@ -230,6 +230,7 @@ class ViewerBridge(Bridge):
     selection_changed = from_js(object)
     copy_selection = from_js(object)
     view_image = from_js(object)
+    copy_image = from_js(object)
     change_background_image = from_js(object)
 
     create_view = to_js()
@@ -371,6 +372,7 @@ class WebView(RestartingWebEngineView):
     ask_for_open = pyqtSignal(object)
     selection_changed = pyqtSignal(object)
     view_image = pyqtSignal(object)
+    copy_image = pyqtSignal(object)
 
     def __init__(self, parent=None):
         self._host_widget = None
@@ -396,6 +398,7 @@ class WebView(RestartingWebEngineView):
         self.bridge.ask_for_open.connect(self.ask_for_open)
         self.bridge.selection_changed.connect(self.selection_changed)
         self.bridge.view_image.connect(self.view_image)
+        self.bridge.copy_image.connect(self.copy_image)
         self.bridge.report_cfi.connect(self.call_callback)
         self.bridge.change_background_image.connect(self.change_background_image)
         self.pending_bridge_ready_actions = {}

src/pyj/read_book/overlay.pyj

@@ -303,6 +303,9 @@ class MainOverlay:  # {{{
                 copy_actions.appendChild(ac(_('View image'), _('View the current image'), def():
                     self.overlay.hide(), ui_operations.view_image(self.elements.img)
                 , 'image'))
+                copy_actions.appendChild(ac(_('Copy image'), _('View the current image'), def():
+                    self.overlay.hide(), ui_operations.copy_image(self.elements.img)
+                , 'copy'))
             if copy_actions.childNodes.length:
                 actions_div.appendChild(copy_actions)
 

src/pyj/viewer-main.pyj

@@ -302,6 +302,8 @@ if window is window.top:
         to_python.copy_selection(text or None)
     ui_operations.view_image = def(name):
         to_python.view_image(name)
+    ui_operations.copy_image = def(name):
+        to_python.copy_image(name)
     ui_operations.change_background_image = def(img_id):
         to_python.change_background_image(img_id)
     ui_operations.quit = def():