Added inserting lines to style toolbar

app/src/main/java/eu/faircode/email/EditTextCompose.java

@@ -317,37 +317,7 @@ public class EditTextCompose extends FixedEditText {
                 }
 
                 private boolean insertLine() {
-                    try {
-                        int start = getSelectionStart();
-                        if (start < 0)
-                            return false;
-
-                        Editable edit = getText();
-                        if (edit == null)
-                            return false;
-
-                        if (start == 0 || edit.charAt(start - 1) != '\n')
-                            edit.insert(start++, "\n");
-                        if (start == edit.length() || edit.charAt(start) != '\n')
-                            edit.insert(start, "\n");
-
-                        edit.insert(start, "\uFFFC"); // Object replacement character
-
-                        int colorSeparator = Helper.resolveColor(getContext(), R.attr.colorSeparator);
-                        float stroke = context.getResources().getDisplayMetrics().density;
-                        edit.setSpan(
-                                new LineSpan(colorSeparator, stroke, 0f),
-                                start, start + 1,
-                                Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
-
-                        setSelection(start + 2);
-
-                        return true;
-                    } catch (Throwable ex) {
-                        Log.e(ex);
-                        ToastEx.makeText(context, Log.formatThrowable(ex), Toast.LENGTH_LONG).show();
-                        return false;
-                    }
+                    return StyleHelper.apply(R.id.menu_style_insert_line, null, null, EditTextCompose.this);
                 }
 
                 private boolean insertSnippet(long id) {

app/src/main/java/eu/faircode/email/StyleHelper.java

@@ -51,7 +51,6 @@ import android.text.style.UnderlineSpan;
 import android.util.LogPrinter;
 import android.util.Pair;
 import android.view.MenuItem;
-import android.view.SubMenu;
 import android.view.View;
 import android.widget.EditText;
 import android.widget.TextView;
@@ -107,6 +106,7 @@ public class StyleHelper {
             R.id.menu_style_subscript,
             R.id.menu_style_superscript,
             R.id.menu_style_strikethrough,
+            R.id.menu_style_insert_line,
             R.id.menu_style_password,
             R.id.menu_style_code,
             R.id.menu_style_clear
@@ -375,7 +375,8 @@ public class StyleHelper {
                     itemId != R.id.menu_style_align && groupId != group_style_align &&
                     itemId != R.id.menu_style_list && groupId != group_style_list &&
                     itemId != R.id.menu_style_indentation && groupId != group_style_indentation &&
-                    itemId != R.id.menu_style_blockquote) {
+                    itemId != R.id.menu_style_blockquote &&
+                    itemId != R.id.menu_style_insert_line) {
                 Pair<Integer, Integer> word = getWord(etBody);
                 if (word == null)
                     return false;
@@ -418,6 +419,8 @@ public class StyleHelper {
                     return setSuperscript(etBody, start, end, false);
                 else if (itemId == R.id.menu_style_strikethrough)
                     return setStrikeThrough(etBody, start, end, false);
+                else if (itemId == R.id.menu_style_insert_line)
+                    return setLine(etBody, end);
                 else if (itemId == R.id.menu_style_password)
                     return setPassword(owner, etBody, start, end);
                 else if (itemId == R.id.menu_style_code) {
@@ -1191,6 +1194,31 @@ public class StyleHelper {
         return true;
     }
 
+    static boolean setLine(EditText etBody, int end) {
+        Log.breadcrumb("style", "action", "line");
+
+        Context context = etBody.getContext();
+        Editable edit = etBody.getText();
+
+        if (end == 0 || edit.charAt(end - 1) != '\n')
+            edit.insert(end++, "\n");
+        if (end == edit.length() || edit.charAt(end) != '\n')
+            edit.insert(end, "\n");
+
+        edit.insert(end, "\uFFFC"); // Object replacement character
+
+        int colorSeparator = Helper.resolveColor(context, R.attr.colorSeparator);
+        float stroke = context.getResources().getDisplayMetrics().density;
+        edit.setSpan(
+                new LineSpan(colorSeparator, stroke, 0f),
+                end, end + 1,
+                Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
+
+        etBody.setSelection(end + 2);
+
+        return true;
+    }
+
     static boolean setPassword(LifecycleOwner owner, EditText etBody, int start, int end) {
         Log.breadcrumb("style", "action", "password");
 

app/src/main/res/layout/include_style_bar.xml

@@ -254,6 +254,21 @@
             app:srcCompat="@drawable/twotone_format_strikethrough_24"
             app:tint="@color/action_foreground" />
 
+        <ImageButton
+            android:id="@+id/menu_style_insert_line"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:background="?android:attr/selectableItemBackgroundBorderless"
+            android:contentDescription="@string/title_insert_line"
+            android:paddingHorizontal="12dp"
+            android:paddingVertical="6dp"
+            android:scaleType="fitCenter"
+            android:tooltipText="@string/title_insert_line"
+            app:layout_constraintStart_toEndOf="@id/menu_style_strikethrough"
+            app:layout_constraintTop_toTopOf="parent"
+            app:srcCompat="@drawable/twotone_horizontal_rule_24"
+            app:tint="@color/action_foreground" />
+
         <ImageButton
             android:id="@+id/menu_style_password"
             android:layout_width="wrap_content"
@@ -264,7 +279,7 @@
             android:paddingVertical="6dp"
             android:scaleType="fitCenter"
             android:tooltipText="@string/title_style_protect"
-            app:layout_constraintStart_toEndOf="@id/menu_style_strikethrough"
+            app:layout_constraintStart_toEndOf="@id/menu_style_insert_line"
             app:layout_constraintTop_toTopOf="parent"
             app:srcCompat="@drawable/twotone_lock_24"
             app:tint="@color/action_foreground" />