Add SCI_SELECTIONFROMPOINT for modifying multiple selections.

4 files changed, 34 insertions, 0 deletions

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);
diff --git a/src/Editor.h b/src/Editor.h
index e7e198aec..19b0c730c 100644
--- a/src/Editor.h
+++ b/src/Editor.h
@@ -527,6 +527,7 @@ protected:	// ScintillaBase subclass needs access to much of Editor
 	/** PositionInSelection returns true if position in selection. */
 	bool PositionInSelection(Sci::Position pos);
 	bool PointInSelection(Point pt);
+	ptrdiff_t SelectionFromPoint(Point pt);
 	bool PointInSelMargin(Point pt) const;
 	Window::Cursor GetMarginCursor(Point pt) const noexcept;
 	void TrimAndSetSelection(Sci::Position currentPos_, Sci::Position anchor_);
diff --git a/src/Selection.cxx b/src/Selection.cxx
index fbdc474eb..53559e329 100644
--- a/src/Selection.cxx
+++ b/src/Selection.cxx
@@ -123,6 +123,13 @@ bool SelectionRange::ContainsCharacter(Sci::Position posCharacter) const noexcep
 		return (posCharacter >= anchor.Position()) && (posCharacter < caret.Position());
 }
 
+bool SelectionRange::ContainsCharacter(SelectionPosition spCharacter) const noexcept {
+	if (anchor > caret)
+		return (spCharacter >= caret) && (spCharacter < anchor);
+	else
+		return (spCharacter >= anchor) && (spCharacter < caret);
+}
+
 SelectionSegment SelectionRange::Intersect(SelectionSegment check) const noexcept {
 	const SelectionSegment inOrder(caret, anchor);
 	if ((inOrder.start <= check.end) || (inOrder.end >= check.start)) {
diff --git a/src/Selection.h b/src/Selection.h
index 30e1e27ad..03ce5083c 100644
--- a/src/Selection.h
+++ b/src/Selection.h
@@ -129,6 +129,7 @@ struct SelectionRange {
 	bool Contains(Sci::Position pos) const noexcept;
 	bool Contains(SelectionPosition sp) const noexcept;
 	bool ContainsCharacter(Sci::Position posCharacter) const noexcept;
+	bool ContainsCharacter(SelectionPosition spCharacter) const noexcept;
 	SelectionSegment Intersect(SelectionSegment check) const noexcept;
 	SelectionPosition Start() const noexcept {
 		return (anchor < caret) ? anchor : caret;