From b733864112fb40f7cc063175347374fee3fa8a92 Mon Sep 17 00:00:00 2001
From: Mathias Mogensen <42929161+Xazin@users.noreply.github.com>
Date: Mon, 2 Oct 2023 16:55:28 +0200
Subject: [PATCH] feat: enable shift+press for selection range (#512)

---
 .../selection/desktop_selection_service.dart  | 38 ++++++++++++-------
 1 file changed, 25 insertions(+), 13 deletions(-)

diff --git a/lib/src/editor/editor_component/service/selection/desktop_selection_service.dart b/lib/src/editor/editor_component/service/selection/desktop_selection_service.dart
index 3bcf2ea34..fdb609d2d 100644
--- a/lib/src/editor/editor_component/service/selection/desktop_selection_service.dart
+++ b/lib/src/editor/editor_component/service/selection/desktop_selection_service.dart
@@ -2,6 +2,7 @@ import 'package:appflowy_editor/appflowy_editor.dart';
 import 'package:appflowy_editor/src/flutter/overlay.dart';
 import 'package:appflowy_editor/src/service/selection/selection_gesture.dart';
 import 'package:flutter/material.dart' hide Overlay, OverlayEntry;
+import 'package:flutter/services.dart';
 import 'package:provider/provider.dart';
 
 class DesktopSelectionServiceWidget extends StatefulWidget {
@@ -198,24 +199,35 @@ class _DesktopSelectionServiceWidgetState
     );
     if (!canTap) return;
 
-    // clear old state.
-    _panStartOffset = null;
-
     final offset = details.globalPosition;
     final node = getNodeInOffset(offset);
     final selectable = node?.selectable;
     if (selectable == null) {
-      clearSelection();
-      return;
+      // Clear old start offset
+      _panStartOffset = null;
+      return clearSelection();
     }
-    final selection = selectable.cursorStyle == CursorStyle.verticalLine
-        ? Selection.collapsed(
-            selectable.getPositionInOffset(offset),
-          )
-        : Selection(
-            start: selectable.start(),
-            end: selectable.end(),
-          );
+
+    Selection? selection;
+    if (RawKeyboard.instance.isShiftPressed && _panStartOffset != null) {
+      final first = getNodeInOffset(_panStartOffset!)?.selectable;
+
+      if (first != null) {
+        final start = first.getSelectionInRange(_panStartOffset!, offset).start;
+        final end =
+            selectable.getSelectionInRange(_panStartOffset!, offset).end;
+
+        selection = Selection(start: start, end: end);
+      }
+    } else {
+      selection = selectable.cursorStyle == CursorStyle.verticalLine
+          ? Selection.collapsed(selectable.getPositionInOffset(offset))
+          : Selection(start: selectable.start(), end: selectable.end());
+
+      // Reset old start offset
+      _panStartOffset = offset;
+    }
+
     updateSelection(selection);
   }