core: Add a member function to show full msg view on toggling.

This function:
 * Adds header content (non-scrollable) to the popup.
 * Fetches message content from FullMsgView class.

Author: Ezio-Sarthak

zulipterminal/core.py

@@ -12,14 +12,17 @@
 import zulip
 from typing_extensions import Literal
 
+from zulipterminal.config.keys import primary_key_for_command
 from zulipterminal.config.themes import ThemeSpec
 from zulipterminal.helper import Message, asynch
 from zulipterminal.model import Model
 from zulipterminal.ui import Screen, View
+from zulipterminal.ui_tools.boxes import MessageBox
 from zulipterminal.ui_tools.utils import create_msg_box_list
 from zulipterminal.ui_tools.views import (
-    AboutView, EditHistoryView, EditModeView, HelpView, MsgInfoView,
-    NoticeView, PopUpConfirmationView, StreamInfoView, StreamMembersView,
+    AboutView, EditHistoryView, EditModeView, FullMsgView, HelpView,
+    MsgInfoView, NoticeView, PopUpConfirmationView, StreamInfoView,
+    StreamMembersView,
 )
 from zulipterminal.version import ZT_VERSION
 
@@ -235,6 +238,26 @@ def show_about(self) -> None:
             'area:help'
         )
 
+    def show_full_msg(
+        self, message: Message,
+        message_links: 'OrderedDict[str, Tuple[str, int, bool]]',
+        time_mentions: List[Tuple[str, str]],
+    ) -> None:
+        msg_box = MessageBox(message, self.model, None)
+        if not msg_box.need_recipient_header():
+            msg_box.widget_list.insert(0, msg_box.top_header_bar(msg_box))
+
+        header = msg_box.widget_list[:2]
+        help_txt = ('Press {} to cycle b/w raw and rendered message'
+                    .format(primary_key_for_command('CYCLE_COMPOSE_FOCUS')))
+        header.append(urwid.Text(('area:help', help_txt), align='center'))
+        content = msg_box.widget_list[2].original_widget[-1]
+        self.show_pop_up(
+            FullMsgView(self, message, message_links, time_mentions, content,
+                        'Full message view (up/down scrolls)'),
+            'area:msg', urwid.Pile(header)
+        )
+
     def show_edit_history(
         self, message: Message,
         message_links: 'OrderedDict[str, Tuple[str, int, bool]]',