Backport: Add SetAppearance method to make changes to appearance settings and only perform

invalidation if the setting is actually changed.

Backport of changeset 7699:ed73f7607752.

1 files changed, 13 insertions, 0 deletions

diff --git a/src/Editor.h b/src/Editor.h
index 4077fa1a4..54c50363d 100644
--- a/src/Editor.h
+++ b/src/Editor.h
@@ -598,6 +598,19 @@ protected:	// ScintillaBase subclass needs access to much of Editor
 	static sptr_t StringResult(sptr_t lParam, const char *val) noexcept;
 	static sptr_t BytesResult(sptr_t lParam, const unsigned char *val, size_t len) noexcept;
 
+	// Set a variable controlling appearance to a value and invalidates the display
+	// if a change was made. Avoids extra text and the possibility of mistyping.
+	template <typename T>
+	bool SetAppearance(T &variable, T value) {
+		// Using ! and == as more types have == defined than !=.
+		const bool changed = !(variable == value);
+		if (changed) {
+			variable = value;
+			InvalidateStyleRedraw();
+		}
+		return changed;
+	}
+
 public:
 	~Editor() override;