Edit Book: Live CSS: Allow copying of CSS rules by right clicking on the Live CSS panel. Fixes #1485237 [[Enhancement] Make info in Live CSS window copiable](https://bugs.launchpad.net/calibre/+bug/1485237)

src/calibre/gui2/tweak_book/live_css.py

@@ -11,7 +11,7 @@ import json
 from PyQt5.Qt import (
     QWidget, QTimer, QStackedLayout, QLabel, QScrollArea, QVBoxLayout,
     QPainter, Qt, QPalette, QRect, QSize, QSizePolicy, pyqtSignal,
-    QColor)
+    QColor, QMenu, QApplication, QIcon)
 
 from calibre.constants import iswindows
 from calibre.gui2.tweak_book import editors, actions, current_container, tprefs
@@ -22,6 +22,7 @@ from css_selectors import parse, SelectorError
 class Heading(QWidget):  # {{{
 
     toggled = pyqtSignal(object)
+    context_menu_requested = pyqtSignal(object, object)
 
     def __init__(self, text, expanded=True, parent=None):
         QWidget.__init__(self, parent)
@@ -32,6 +33,10 @@ class Heading(QWidget):  # {{{
         self.hovering = False
         self.do_layout()
 
+    @property
+    def lines_for_copy(self):
+        return [self.text]
+
     def do_layout(self):
         try:
             f = self.parent().font()
@@ -79,6 +84,9 @@ class Heading(QWidget):  # {{{
         self.hovering = False
         self.update()
         return QWidget.leaveEvent(self, ev)
+
+    def contextMenuEvent(self, ev):
+        self.context_menu_requested.emit(self, ev)
 # }}}
 
 class Cell(object):  # {{{
@@ -117,6 +125,7 @@ class Cell(object):  # {{{
 class Declaration(QWidget):
 
     hyperlink_activated = pyqtSignal(object)
+    context_menu_requested = pyqtSignal(object, object)
 
     def __init__(self, html_name, data, is_first=False, parent=None):
         QWidget.__init__(self, parent)
@@ -124,6 +133,7 @@ class Declaration(QWidget):
         self.data = data
         self.is_first = is_first
         self.html_name = html_name
+        self.lines_for_copy = []
         self.do_layout()
         self.setMouseTracking(True)
 
@@ -149,6 +159,7 @@ class Declaration(QWidget):
                 Cell(sel, QRect(br1.right() + side_margin, ypos, br2.width(), br2.height()), right_align=True)
             ])
             ypos += max(br1.height(), br2.height()) + 2 * line_spacing
+            self.lines_for_copy.append(name + ' ' + sel)
 
         for prop in self.data['properties']:
             text = prop.name + ':\xa0'
@@ -159,6 +170,7 @@ class Declaration(QWidget):
                 Cell(text, QRect(side_margin, ypos, br1.width(), br1.height()), color_role=QPalette.LinkVisited, is_overriden=prop.is_overriden),
                 Cell(vtext, QRect(br1.right() + side_margin, ypos, br2.width(), br2.height()), swatch=prop.color, is_overriden=prop.is_overriden)
             ])
+            self.lines_for_copy.append(text + vtext)
             ypos += max(br1.height(), br2.height()) + line_spacing
 
         self.height_hint = ypos + line_spacing
@@ -204,7 +216,7 @@ class Declaration(QWidget):
         return QWidget.mouseMoveEvent(self, ev)
 
     def mousePressEvent(self, ev):
-        if hasattr(self, 'hyperlink_rect'):
+        if hasattr(self, 'hyperlink_rect') and ev.button() == Qt.LeftButton:
             pos = ev.pos()
             if self.hyperlink_rect.contains(pos):
                 self.emit_hyperlink_activated()
@@ -236,6 +248,9 @@ class Declaration(QWidget):
             cell.override_color = QColor(Qt.red) if hovering else None
             self.update()
 
+    def contextMenuEvent(self, ev):
+        self.context_menu_requested.emit(self, ev)
+
 class Box(QWidget):
 
     hyperlink_activated = pyqtSignal(object)
@@ -250,7 +265,7 @@ class Box(QWidget):
     def show_data(self, data):
         for w in self.widgets:
             self.layout().removeWidget(w)
-            for x in ('toggled', 'hyperlink_activated'):
+            for x in ('toggled', 'hyperlink_activated', 'context_menu_requested'):
                 if hasattr(w, x):
                     try:
                         getattr(w, x).disconnect()
@@ -279,6 +294,8 @@ class Box(QWidget):
         declaration = {'properties':[Property([k, ccss[k][0], '', ccss[k][1]]) for k in sorted(ccss)]}
         d = Declaration(None, declaration, is_first=True, parent=self)
         self.widgets.append(d), self.layout().addWidget(d)
+        for w in self.widgets:
+            w.context_menu_requested.connect(self.context_menu_requested)
 
     def heading_toggled(self, heading):
         for i, w in enumerate(self.widgets):
@@ -294,6 +311,49 @@ class Box(QWidget):
             w.do_layout()
             w.updateGeometry()
 
+    @property
+    def lines_for_copy(self):
+        ans = []
+        for w in self.widgets:
+            ans += w.lines_for_copy
+        return ans
+
+    def context_menu_requested(self, widget, ev):
+        if isinstance(widget, Heading):
+            start = widget
+        else:
+            found = False
+            for w in reversed(self.widgets):
+                if w is widget:
+                    found = True
+                elif found and isinstance(w, Heading):
+                    start = w
+                    break
+            else:
+                return
+        found = False
+        lines = []
+        for w in self.widgets:
+            if found and isinstance(w, Heading):
+                break
+            if w is start:
+                found = True
+            if found:
+                lines += w.lines_for_copy
+        if not lines:
+            return
+        block = '\n'.join(lines).replace('\xa0', ' ')
+        heading = lines[0]
+        m = QMenu(self)
+        m.addAction(QIcon(I('edit-copy.png')), _('Copy') + ' ' + heading.replace('\xa0', ' '), lambda : QApplication.instance().clipboard().setText(block))
+        all_lines = []
+        for w in self.widgets:
+            all_lines += w.lines_for_copy
+        all_text = '\n'.join(all_lines).replace('\xa0', ' ')
+        m.addAction(QIcon(I('edit-copy.png')), _('Copy everything'), lambda : QApplication.instance().clipboard().setText(all_text))
+        m.exec_(ev.globalPos())
+
+
 class Property(object):
 
     __slots__ = 'name', 'value', 'important', 'color', 'specificity', 'is_overriden'