Allow toggling visibility of line numbers

Closes #772

Author: dail8859

src/NotepadNext/ApplicationSettings.cpp

@@ -67,3 +67,4 @@ CREATE_SETTING(Editor, FontSize, fontSize, int, []() { return qApp->font().point
 CREATE_SETTING(Editor, AdditionalWordChars, additionalWordChars, QString, QStringLiteral(""));
 CREATE_SETTING(Editor, DefaultEOLMode, defaultEOLMode, QString, QStringLiteral(""))
 CREATE_SETTING(Editor, URLHighlighting, urlHighlighting, bool, true)
+CREATE_SETTING(Editor, ShowLineNumbers, showLineNumbers, bool, true)

src/NotepadNext/ApplicationSettings.h

@@ -109,4 +109,5 @@ class ApplicationSettings : public QSettings
     DEFINE_SETTING(AdditionalWordChars, additionalWordChars, QString);
     DEFINE_SETTING(DefaultEOLMode, defaultEOLMode, QString)
     DEFINE_SETTING(URLHighlighting, urlHighlighting, bool)
+    DEFINE_SETTING(ShowLineNumbers, showLineNumbers, bool)
 };

src/NotepadNext/EditorManager.cpp

@@ -113,9 +113,18 @@ EditorManager::EditorManager(ApplicationSettings *settings, QObject *parent)
 
     connect(settings, &ApplicationSettings::urlHighlightingChanged, this, [=](bool b){
         for (auto &editor : getEditors()) {
-            URLFinder *urlFinder = editor->findChild<URLFinder *>(QString(), Qt::FindDirectChildrenOnly);
-            if (urlFinder) {
-                urlFinder->setEnabled(b);
+            URLFinder *decorator = editor->findChild<URLFinder *>(QString(), Qt::FindDirectChildrenOnly);
+            if (decorator) {
+                decorator->setEnabled(b);
+            }
+        }
+    });
+
+    connect(settings, &ApplicationSettings::showLineNumbersChanged, this, [=](bool b){
+        for (auto &editor : getEditors()) {
+            LineNumbers *decorator = editor->findChild<LineNumbers *>(QString(), Qt::FindDirectChildrenOnly);
+            if (decorator) {
+                decorator->setEnabled(b);
             }
         }
     });
@@ -302,7 +311,7 @@ void EditorManager::setupEditor(ScintillaNext *editor)
     b->setEnabled(true);
 
     LineNumbers *l = new LineNumbers(editor);
-    l->setEnabled(true);
+    l->setEnabled(settings->showLineNumbers());
 
     SurroundSelection *ss = new SurroundSelection(editor);
     ss->setEnabled(true);

src/NotepadNext/dialogs/PreferencesDialog.cpp

@@ -98,6 +98,7 @@ PreferencesDialog::PreferencesDialog(ApplicationSettings *settings, QWidget *par
     });
 
     MapSettingToCheckBox(ui->checkBoxHighlightURLs, &ApplicationSettings::urlHighlighting, &ApplicationSettings::setURLHighlighting, &ApplicationSettings::urlHighlightingChanged);
+    MapSettingToCheckBox(ui->checkBoxShowLineNumbers, &ApplicationSettings::showLineNumbers, &ApplicationSettings::setShowLineNumbers, &ApplicationSettings::showLineNumbersChanged);
 }
 
 PreferencesDialog::~PreferencesDialog()

src/NotepadNext/dialogs/PreferencesDialog.ui

@@ -7,7 +7,7 @@
     <x>0</x>
     <y>0</y>
     <width>803</width>
-    <height>564</height>
+    <height>597</height>
    </rect>
   </property>
   <property name="windowTitle">
@@ -25,7 +25,7 @@
         <x>0</x>
         <y>0</y>
         <width>783</width>
-        <height>512</height>
+        <height>545</height>
        </rect>
       </property>
       <layout class="QVBoxLayout" name="verticalLayout_4">
@@ -201,6 +201,13 @@
          </property>
         </widget>
        </item>
+       <item>
+        <widget class="QCheckBox" name="checkBoxShowLineNumbers">
+         <property name="text">
+          <string>Show Line Numbers</string>
+         </property>
+        </widget>
+       </item>
        <item>
         <spacer name="verticalSpacer">
          <property name="orientation">