Added DropSelectionN API.

3 files changed, 21 insertions, 0 deletions

diff --git a/src/Editor.cxx b/src/Editor.cxx
index 7e1da9e20..f254af4dd 100644
--- a/src/Editor.cxx
+++ b/src/Editor.cxx
@@ -9526,6 +9526,11 @@ sptr_t Editor::WndProc(unsigned int iMessage, uptr_t wParam, sptr_t lParam) {
 		Redraw();
 		break;
 
+	case SCI_DROPSELECTIONN:
+		sel.DropSelection(wParam);
+		Redraw();
+		break;
+
 	case SCI_SETMAINSELECTION:
 		sel.SetMain(wParam);
 		Redraw();
diff --git a/src/Selection.cxx b/src/Selection.cxx
index 0c02c198b..ae4d8bfc7 100644
--- a/src/Selection.cxx
+++ b/src/Selection.cxx
@@ -305,6 +305,21 @@ void Selection::AddSelectionWithoutTrim(SelectionRange range) {
 	mainRange = ranges.size() - 1;
 }
 
+void Selection::DropSelection(size_t r) {
+	if ((ranges.size() > 1) && (r < ranges.size())) {
+		size_t mainNew = mainRange;
+		if (mainNew >= r) {
+			if (mainNew == 0) {
+				mainNew = ranges.size() - 2;
+			} else {
+				mainNew--;
+			}
+		}
+		ranges.erase(ranges.begin() + r);
+		mainRange = mainNew;
+	}
+}
+
 void Selection::TentativeSelection(SelectionRange range) {
 	if (!tentativeMain) {
 		rangesSaved = ranges;
diff --git a/src/Selection.h b/src/Selection.h
index 956a0f99d..e84d3c32c 100644
--- a/src/Selection.h
+++ b/src/Selection.h
@@ -167,6 +167,7 @@ public:
 	void SetSelection(SelectionRange range);
 	void AddSelection(SelectionRange range);
 	void AddSelectionWithoutTrim(SelectionRange range);
+	void DropSelection(size_t r);
 	void TentativeSelection(SelectionRange range);
 	void CommitTentative();
 	int CharacterInSelection(int posCharacter) const;