Add Hemingway Mode

Closes #40

data/ui/Menu.ui

@@ -6,6 +6,10 @@
                 <attribute name="label" translatable="yes">Focus Mode</attribute>
                 <attribute name="action">app.focus_mode</attribute>
             </item>
+            <item>
+                <attribute name="label" translatable="yes">Hemingway Mode</attribute>
+                <attribute name="action">app.hemingway_mode</attribute>
+            </item>
             <item>
                 <attribute name="label" translatable="yes">Preview</attribute>
                 <attribute name="action">app.preview</attribute>

data/ui/Shortcuts.ui

@@ -55,20 +55,27 @@
             </child>
             <child>
               <object class="GtkShortcutsShortcut" id="s1-7">
+                <property name="visible">True</property>
+                <property name="title" translatable="yes" context="shortcut window">Hemingway mode</property>
+                <property name="accelerator">&lt;Primary&gt;t</property>
+              </object>
+            </child>
+            <child>
+              <object class="GtkShortcutsShortcut" id="s1-8">
                 <property name="visible">True</property>
                 <property name="title" translatable="yes" context="shortcut window">Fullscreen</property>
                 <property name="accelerator">F11</property>
               </object>
             </child>
             <child>
-              <object class="GtkShortcutsShortcut" id="s1-8">
+              <object class="GtkShortcutsShortcut" id="s1-9">
                 <property name="visible">True</property>
                 <property name="title" translatable="yes" context="shortcut window">Preview</property>
                 <property name="accelerator">&lt;Primary&gt;p</property>
               </object>
             </child>
             <child>
-              <object class="GtkShortcutsShortcut" id="s1-9">
+              <object class="GtkShortcutsShortcut" id="s1-10">
                 <property name="visible">True</property>
                 <property name="title" translatable="yes" context="shortcut window">Search</property>
                 <property name="accelerator">&lt;Primary&gt;f</property>

uberwriter/UberwriterTextEditor.py

@@ -122,6 +122,9 @@ class TextEditor(Gtk.TextView):
         self.not_undoable_action = False
         self.undo_in_progress = False
 
+        self.can_delete = True
+        self.connect('key-press-event', self.on_key_press_event)
+
         self.format_shortcuts = FormatShortcuts(self.get_buffer(), self)
 
         self.connect('insert-italic', self.set_italic)
@@ -393,6 +396,12 @@ class TextEditor(Gtk.TextView):
         toggles self.not_undoable_action"""
         self.not_undoable_action = False
 
+    def on_key_press_event(self, widget, event):
+        if widget == self and not self.can_delete:
+            return event.keyval == Gdk.KEY_BackSpace or event.keyval == Gdk.KEY_Delete
+        else:
+            return False
+
     def set_italic(self, _widget, _data=None):
         """Ctrl + I"""
         self.format_shortcuts.italic()

uberwriter/UberwriterWindow.py

@@ -358,7 +358,7 @@ class UberwriterWindow(Gtk.ApplicationWindow):
         self.update_line_and_char_count()
         self.check_scroll(self.text_buffer.get_insert())
 
-    def toggle_fullscreen(self, state):
+    def set_fullscreen(self, state):
         """Puts the application in fullscreen mode and show/hides
         the poller for motion in the top border
 
@@ -376,7 +376,7 @@ class UberwriterWindow(Gtk.ApplicationWindow):
 
         self.text_editor.grab_focus()
 
-    def set_focusmode(self, state):
+    def set_focus_mode(self, state):
         """toggle focusmode
         """
 
@@ -408,6 +408,12 @@ class UberwriterWindow(Gtk.ApplicationWindow):
                 self.spell_checker._misspelled.set_property('underline', 4)
             _click_event = self.text_editor.disconnect(self.click_event)
 
+    def set_hemingway_mode(self, state):
+        """toggle hemingwaymode
+        """
+        self.text_editor.can_delete = not state.get_boolean()
+        self.text_editor.grab_focus()
+
     def on_focusmode_click(self, *_args):
         """call MarkupBuffer to mark as bold the line where the cursor is
         """

uberwriter_lib/AppWindow.py

@@ -72,6 +72,12 @@ class Application(Gtk.Application):
         action.connect("change-state", self.on_focus_mode)
         self.add_action(action)
 
+        action = Gio.SimpleAction.new_stateful("hemingway_mode",
+                                               None,
+                                               GLib.Variant.new_boolean(False))
+        action.connect("change-state", self.on_hemingway_mode)
+        self.add_action(action)
+
         action = Gio.SimpleAction.new_stateful("fullscreen",
                                                None,
                                                GLib.Variant.new_boolean(False))
@@ -143,6 +149,7 @@ class Application(Gtk.Application):
         # Shortcuts
 
         self.set_accels_for_action("app.focus_mode", ["<Ctl>d"])
+        self.set_accels_for_action("app.hemingway_mode", ["<Ctl>t"])
         self.set_accels_for_action("app.fullscreen", ["F11"])
         self.set_accels_for_action("app.preview", ["<Ctl>p"])
         self.set_accels_for_action("app.search", ["<Ctl>f"])
@@ -238,11 +245,15 @@ class Application(Gtk.Application):
 
     def on_focus_mode(self, action, value):
         action.set_state(value)
-        self.window.set_focusmode(value)
+        self.window.set_focus_mode(value)
+
+    def on_hemingway_mode(self, action, value):
+        action.set_state(value)
+        self.window.set_hemingway_mode(value)
 
     def on_fullscreen(self, action, value):
         action.set_state(value)
-        self.window.toggle_fullscreen(value)
+        self.window.set_fullscreen(value)
 
     def on_preview(self, action, value):
         action.set_state(value)