From 26b60d88b6d848f3ba55ca046852e079be5fe3c6 Mon Sep 17 00:00:00 2001
From: Neil <nyamatongwe@gmail.com>
Date: Sun, 5 Nov 2023 22:11:26 +1100
Subject: Add SCI_SELECTIONFROMPOINT for modifying multiple selections.

---
 src/Editor.cxx | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

(limited to 'src/Editor.cxx')

diff --git a/src/Editor.cxx b/src/Editor.cxx
index 627179876..527c9b47c 100644
--- a/src/Editor.cxx
+++ b/src/Editor.cxx
@@ -4511,6 +4511,28 @@ bool Editor::PointInSelection(Point pt) {
 	return false;
 }
 
+ptrdiff_t Editor::SelectionFromPoint(Point pt) {
+	// Prioritize checking inside non-empty selections since each character will be inside only 1 
+	const SelectionPosition posChar = SPositionFromLocation(pt, true, true);
+	for (size_t r = 0; r < sel.Count(); r++) {
+		if (sel.Range(r).ContainsCharacter(posChar)) {
+			return r;
+		}
+	}
+
+	// Then check if near empty selections as may be near more than 1
+	const SelectionPosition pos = SPositionFromLocation(pt, true, false);
+	for (size_t r = 0; r < sel.Count(); r++) {
+		const SelectionRange &range = sel.Range(r);
+		if ((range.Empty()) && (pos == range.caret)) {
+			return r;
+		}
+	}
+
+	// No selection at point
+	return -1;
+}
+
 bool Editor::PointInSelMargin(Point pt) const {
 	// Really means: "Point in a margin"
 	if (vs.fixedColumnWidth > 0) {	// There is a margin
@@ -8676,6 +8698,9 @@ sptr_t Editor::WndProc(Message iMessage, uptr_t wParam, sptr_t lParam) {
 		Redraw();
 		break;
 
+	case Message::SelectionFromPoint:
+		return SelectionFromPoint(PointFromParameters(wParam, lParam));
+
 	case Message::DropSelectionN:
 		sel.DropSelection(wParam);
 		ContainerNeedsUpdate(Update::Selection);
-- 
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