Adding functionality to delete Source

A Source Profile Short menu, which is responsible for displaying Source
name and Hamburger Button Menu. Hamburger button menu contains single
operation to delete the Source.

Resolves: freedomofpress#18

securedrop_client/gui/main.py

@@ -23,7 +23,8 @@
 from PyQt5.QtCore import Qt
 from securedrop_client import __version__
 from securedrop_client.gui.widgets import (ToolBar, MainView, LoginDialog,
-                                           ConversationView)
+                                           ConversationView,
+                                           SourceProfileShortWidget)
 from securedrop_client.resources import load_icon
 
 
@@ -205,7 +206,15 @@ def show_conversation_for(self, source):
                                "identity details released. She feels "
                                "horrible. She wants the children who survived "
                                "to find peace. Thanks.")
-        self.main_view.update_view(conversation)
+
+        container = QWidget()
+        layout = QVBoxLayout()
+        container.setLayout(layout)
+        source_profile = SourceProfileShortWidget(source)
+
+        layout.addWidget(source_profile)
+        layout.addWidget(conversation)
+        self.main_view.update_view(container)
 
     def set_status(self, message, duration=5000):
         """

securedrop_client/gui/widgets.py

@@ -19,11 +19,12 @@
 import logging
 import arrow
 from PyQt5.QtCore import Qt
-from PyQt5.QtGui import QPainter
+from PyQt5.QtGui import QPainter, QIcon
 from PyQt5.QtWidgets import (QListWidget, QTextEdit, QLabel, QToolBar, QAction,
                              QWidget, QListWidgetItem, QHBoxLayout,
                              QPushButton, QVBoxLayout, QLineEdit, QScrollArea,
-                             QPlainTextEdit, QSpacerItem, QSizePolicy, QDialog)
+                             QPlainTextEdit, QSpacerItem, QSizePolicy, QDialog,
+                             QMenu, QToolButton)
 from securedrop_client.resources import load_svg, load_image
 
 
@@ -487,3 +488,81 @@ def add_reply(self, reply, files=None):
         if files:
             for f in files:
                 self.conversation_layout.addWidget(FileWidget(f, 'right'))
+
+
+class DeleteSourceAction(QAction):
+    """
+    Use this action to Delete the source record
+    """
+
+    def __init__(self, source, parent):
+        self.source = source
+        self.text = _("Delete")
+        super().__init__(self.text, parent)
+        self.triggered.connect(self._delete_source)
+
+    def _delete_source(self):
+        self.source.delete()
+
+
+class SourceMenu(QMenu):
+    """
+    Renders Menu for performing various operations to Source.
+
+    Note: It only supports "delete" operation at the moment.
+    """
+
+    def __init__(self, source):
+        super().__init__()
+        self.source = source
+        actions = (
+            DeleteSourceAction(self.source, self),
+        )
+        for action in actions:
+            self.addAction(action)
+
+
+class HamburgerMenuButton(QToolButton):
+    """
+    A menu button for displaying source menu
+    """
+
+    def __init__(self, source):
+        super().__init__()
+        self.source = source
+        hamburger_icon = load_image("hamburger_icon.png")
+        self.setIcon(QIcon(hamburger_icon))
+        self.setMenu(SourceMenu(self.source))
+        self.setPopupMode(QToolButton.InstantPopup)
+
+
+class TitleLabel(QLabel):
+    """
+    Centered aligned, Heading level 3 label
+    """
+
+    def __init__(self, text):
+        html_text = "<h3>%s</h3>" % (text,)
+        super().__init__(_(html_text))
+        self.setAlignment(Qt.AlignCenter)
+
+
+class SourceProfileShortWidget(QWidget):
+    """
+    Renders a Source Profile short view.
+
+    It contains a journalist designation and menu to perform single operation
+    delete at the moment.
+    """
+
+    def __init__(self, source):
+        super().__init__()
+        self.source = source
+        self.layout = QHBoxLayout()
+        self.setLayout(self.layout)
+        widgets = (
+            TitleLabel(self.source.journalist_designation),
+            HamburgerMenuButton(self.source)
+        )
+        for widget in widgets:
+            self.layout.addWidget(widget)