Add a trim and accept button

src/calibre/gui2/dialogs/trim_image.py

@@ -59,6 +59,10 @@ class TrimImage(QDialog):
         bb.rejected.connect(self.reject)
         l.addWidget(bb)
 
+        self.tok = b = bb.addButton(_('Trim and OK'), QDialogButtonBox.ActionRole)
+        b.clicked.connect(self.trim_and_accept)
+        b.setIcon(self.trim_action.icon())
+
         self.resize(QSize(900, 600))
         geom = gprefs.get('image-trim-dialog-geometry', None)
         if geom is not None:
@@ -87,6 +91,10 @@ class TrimImage(QDialog):
         self.cleanup()
         QDialog.reject(self)
 
+    def trim_and_accept(self):
+        if self.canvas.trim_image():
+            self.accept()
+
 if __name__ == '__main__':
     app = QApplication([])
     fname = sys.argv[-1]

src/calibre/gui2/tweak_book/editor/canvas.py

@@ -194,9 +194,11 @@ class Canvas(QWidget):
     @imageop
     def trim_image(self):
         if self.selection_state.rect is None:
-            return error_dialog(self, _('No selection'), _(
+            error_dialog(self, _('No selection'), _(
                 'No active selection, first select a region in the image, by dragging with your mouse'), show=True)
+            return False
         self.undo_stack.push(Trim(self))
+        return True
 
     # The selection rectangle {{{
     @property