Expose LineEdit scroll offset to scripts

(cherry picked from commit 4775db1600ea69dd961767399441820f274e41f8)

doc/classes/LineEdit.xml

@@ -76,6 +76,13 @@
 				Returns the [PopupMenu] of this [LineEdit]. By default, this menu is displayed when right-clicking on the [LineEdit].
 			</description>
 		</method>
+		<method name="get_scroll_offset" qualifiers="const">
+			<return type="int">
+			</return>
+			<description>
+				Returns the scroll offset due to [member caret_position], as a number of characters.
+			</description>
+		</method>
 		<method name="menu_option">
 			<return type="void">
 			</return>

scene/gui/line_edit.cpp

@@ -674,7 +674,7 @@ void LineEdit::_notification(int p_what) {
 #endif
 		case NOTIFICATION_RESIZED: {
 
-			window_pos = 0;
+			scroll_offset = 0;
 			set_cursor_position(get_cursor_position());
 
 		} break;
@@ -735,7 +735,7 @@ void LineEdit::_notification(int p_what) {
 				} break;
 				case ALIGN_CENTER: {
 
-					if (window_pos != 0)
+					if (scroll_offset != 0)
 						x_ofs = style->get_offset().x;
 					else
 						x_ofs = MAX(style->get_margin(MARGIN_LEFT), int(size.width - (cached_text_width)) / 2);
@@ -747,7 +747,7 @@ void LineEdit::_notification(int p_what) {
 			}
 
 			int ofs_max = width - style->get_margin(MARGIN_RIGHT);
-			int char_ofs = window_pos;
+			int char_ofs = scroll_offset;
 
 			int y_area = height - style->get_minimum_size().height;
 			int y_ofs = style->get_offset().y + (y_area - font->get_height()) / 2;
@@ -779,7 +779,7 @@ void LineEdit::_notification(int p_what) {
 				r_icon->draw(ci, Point2(width - r_icon->get_width() - style->get_margin(MARGIN_RIGHT), height / 2 - r_icon->get_height() / 2), color_icon);
 
 				if (align == ALIGN_CENTER) {
-					if (window_pos == 0) {
+					if (scroll_offset == 0) {
 						x_ofs = MAX(style->get_margin(MARGIN_LEFT), int(size.width - cached_text_width - r_icon->get_width() - style->get_margin(MARGIN_RIGHT) * 2) / 2);
 					}
 				} else {
@@ -1012,7 +1012,7 @@ void LineEdit::undo() {
 	TextOperation op = undo_stack_pos->get();
 	text = op.text;
 	cached_width = op.cached_width;
-	window_pos = op.window_pos;
+	scroll_offset = op.scroll_offset;
 	set_cursor_position(op.cursor_pos);
 
 	if (expand_to_text_length)
@@ -1032,7 +1032,7 @@ void LineEdit::redo() {
 	TextOperation op = undo_stack_pos->get();
 	text = op.text;
 	cached_width = op.cached_width;
-	window_pos = op.window_pos;
+	scroll_offset = op.scroll_offset;
 	set_cursor_position(op.cursor_pos);
 
 	if (expand_to_text_length)
@@ -1059,7 +1059,7 @@ void LineEdit::shift_selection_check_post(bool p_shift) {
 void LineEdit::set_cursor_at_pixel_pos(int p_x) {
 
 	Ref<Font> font = get_font("font");
-	int ofs = window_pos;
+	int ofs = scroll_offset;
 	Ref<StyleBox> style = get_stylebox("normal");
 	int pixel_ofs = 0;
 	Size2 size = get_size();
@@ -1075,7 +1075,7 @@ void LineEdit::set_cursor_at_pixel_pos(int p_x) {
 		} break;
 		case ALIGN_CENTER: {
 
-			if (window_pos != 0)
+			if (scroll_offset != 0)
 				pixel_ofs = int(style->get_offset().x);
 			else
 				pixel_ofs = int(size.width - (cached_width)) / 2;
@@ -1113,7 +1113,7 @@ void LineEdit::set_cursor_at_pixel_pos(int p_x) {
 int LineEdit::get_cursor_pixel_pos() {
 
 	Ref<Font> font = get_font("font");
-	int ofs = window_pos;
+	int ofs = scroll_offset;
 	Ref<StyleBox> style = get_stylebox("normal");
 	int pixel_ofs = 0;
 	Size2 size = get_size();
@@ -1129,7 +1129,7 @@ int LineEdit::get_cursor_pixel_pos() {
 		} break;
 		case ALIGN_CENTER: {
 
-			if (window_pos != 0)
+			if (scroll_offset != 0)
 				pixel_ofs = int(style->get_offset().x);
 			else
 				pixel_ofs = int(size.width - (cached_width)) / 2;
@@ -1215,7 +1215,7 @@ void LineEdit::delete_char() {
 	set_cursor_position(get_cursor_position() - 1);
 
 	if (align == ALIGN_CENTER || align == ALIGN_RIGHT) {
-		window_pos = CLAMP(window_pos - 1, 0, MAX(text.length() - 1, 0));
+		scroll_offset = CLAMP(scroll_offset - 1, 0, MAX(text.length() - 1, 0));
 	}
 
 	_text_changed();
@@ -1242,13 +1242,13 @@ void LineEdit::delete_text(int p_from_column, int p_to_column) {
 
 		cursor_pos = text.length();
 	}
-	if (window_pos > cursor_pos) {
+	if (scroll_offset > cursor_pos) {
 
-		window_pos = cursor_pos;
+		scroll_offset = cursor_pos;
 	}
 
 	if (align == ALIGN_CENTER || align == ALIGN_RIGHT) {
-		window_pos = CLAMP(window_pos - (p_to_column - p_from_column), 0, MAX(text.length() - 1, 0));
+		scroll_offset = CLAMP(scroll_offset - (p_to_column - p_from_column), 0, MAX(text.length() - 1, 0));
 	}
 
 	if (!text_changed_dirty) {
@@ -1270,7 +1270,7 @@ void LineEdit::set_text(String p_text) {
 
 	update();
 	cursor_pos = 0;
-	window_pos = 0;
+	scroll_offset = 0;
 }
 
 void LineEdit::clear() {
@@ -1319,17 +1319,16 @@ void LineEdit::set_cursor_position(int p_pos) {
 	cursor_pos = p_pos;
 
 	if (!is_inside_tree()) {
-
-		window_pos = cursor_pos;
+		scroll_offset = cursor_pos;
 		return;
 	}
 
 	Ref<StyleBox> style = get_stylebox("normal");
 	Ref<Font> font = get_font("font");
 
-	if (cursor_pos <= window_pos) {
+	if (cursor_pos <= scroll_offset) {
 		// Adjust window if cursor goes too much to the left.
-		set_window_pos(MAX(0, cursor_pos - 1));
+		set_scroll_offset(MAX(0, cursor_pos - 1));
 	} else {
 		// Adjust window if cursor goes too much to the right.
 		int window_width = get_size().width - style->get_minimum_size().width;
@@ -1341,14 +1340,13 @@ void LineEdit::set_cursor_position(int p_pos) {
 
 		if (window_width < 0)
 			return;
-		int wp = window_pos;
+		int wp = scroll_offset;
 
 		if (font.is_valid()) {
 
 			int accum_width = 0;
 
-			for (int i = cursor_pos; i >= window_pos; i--) {
-
+			for (int i = cursor_pos; i >= scroll_offset; i--) {
 				if (i >= text.length()) {
 					// Do not do this, because if the cursor is at the end, its just fine that it takes no space.
 					// accum_width = font->get_char_size(' ').width;
@@ -1366,8 +1364,9 @@ void LineEdit::set_cursor_position(int p_pos) {
 			}
 		}
 
-		if (wp != window_pos)
-			set_window_pos(wp);
+		if (wp != scroll_offset) {
+			set_scroll_offset(wp);
+		}
 	}
 	update();
 }
@@ -1377,10 +1376,15 @@ int LineEdit::get_cursor_position() const {
 	return cursor_pos;
 }
 
-void LineEdit::set_window_pos(int p_pos) {
+void LineEdit::set_scroll_offset(int p_pos) {
+	scroll_offset = p_pos;
+	if (scroll_offset < 0) {
+		scroll_offset = 0;
+	}
+}
 
-	window_pos = p_pos;
-	if (window_pos < 0) window_pos = 0;
+int LineEdit::get_scroll_offset() const {
+	return scroll_offset;
 }
 
 void LineEdit::append_at_cursor(String p_text) {
@@ -1402,7 +1406,7 @@ void LineEdit::clear_internal() {
 	_clear_undo_stack();
 	cached_width = 0;
 	cursor_pos = 0;
-	window_pos = 0;
+	scroll_offset = 0;
 	undo_text = "";
 	text = "";
 	update();
@@ -1637,7 +1641,7 @@ void LineEdit::set_expand_to_text_length(bool p_enabled) {
 
 	expand_to_text_length = p_enabled;
 	minimum_size_changed();
-	set_window_pos(0);
+	set_scroll_offset(0);
 }
 
 bool LineEdit::get_expand_to_text_length() const {
@@ -1762,7 +1766,7 @@ void LineEdit::_create_undo_state() {
 	op.text = text;
 	op.cached_width = cached_width;
 	op.cursor_pos = cursor_pos;
-	op.window_pos = window_pos;
+	op.scroll_offset = scroll_offset;
 	undo_stack.push_back(op);
 }
 
@@ -1808,6 +1812,7 @@ void LineEdit::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("get_placeholder_alpha"), &LineEdit::get_placeholder_alpha);
 	ClassDB::bind_method(D_METHOD("set_cursor_position", "position"), &LineEdit::set_cursor_position);
 	ClassDB::bind_method(D_METHOD("get_cursor_position"), &LineEdit::get_cursor_position);
+	ClassDB::bind_method(D_METHOD("get_scroll_offset"), &LineEdit::get_scroll_offset);
 	ClassDB::bind_method(D_METHOD("set_expand_to_text_length", "enabled"), &LineEdit::set_expand_to_text_length);
 	ClassDB::bind_method(D_METHOD("get_expand_to_text_length"), &LineEdit::get_expand_to_text_length);
 	ClassDB::bind_method(D_METHOD("cursor_set_blink_enabled", "enabled"), &LineEdit::cursor_set_blink_enabled);
@@ -1888,7 +1893,7 @@ LineEdit::LineEdit() {
 	cached_width = 0;
 	cached_placeholder_width = 0;
 	cursor_pos = 0;
-	window_pos = 0;
+	scroll_offset = 0;
 	window_has_focus = true;
 	max_length = 0;
 	pass = false;

scene/gui/line_edit.h

@@ -81,7 +81,7 @@ private:
 	PopupMenu *menu;
 
 	int cursor_pos;
-	int window_pos;
+	int scroll_offset;
 	int max_length; // 0 for no maximum.
 
 	int cached_width;
@@ -108,7 +108,7 @@ private:
 
 	struct TextOperation {
 		int cursor_pos;
-		int window_pos;
+		int scroll_offset;
 		int cached_width;
 		String text;
 	};
@@ -145,7 +145,8 @@ private:
 	void shift_selection_check_post(bool);
 
 	void selection_fill_at_cursor();
-	void set_window_pos(int p_pos);
+	void set_scroll_offset(int p_pos);
+	int get_scroll_offset() const;
 
 	void set_cursor_at_pixel_pos(int p_x);
 	int get_cursor_pixel_pos();