@@ -147,11 +147,15 @@ pub fn check_cursor_in_view(view: &mut View) -> bool {
147147}
148148
149149pub fn page_up(view: &mut View, _count: usize) {
150+ if view.first_line < PADDING {
151+ return;
152+ }
153+
150154 view.first_line = view.first_line.saturating_sub(view.size.1 as usize);
151155
152156 if !check_cursor_in_view(view) {
153157 let text = view.state.doc();
154− let pos = text.line_to_char(view.last_line().saturating_sub(PADDING as usize));
158+ let pos = text.line_to_char(view.last_line().saturating_sub(PADDING));
155159 view.state.selection = Selection::single(pos, pos);
156160 }
157161}
@@ -167,11 +171,15 @@ pub fn page_down(view: &mut View, _count: usize) {
167171}
168172
169173pub fn half_page_up(view: &mut View, _count: usize) {
174+ if view.first_line < PADDING {
175+ return;
176+ }
177+
170178 view.first_line = view.first_line.saturating_sub(view.size.1 as usize / 2);
171179
172180 if !check_cursor_in_view(view) {
173181 let text = &view.state.doc;
174− let pos = text.line_to_char(view.last_line() - PADDING as usize);
182+ let pos = text.line_to_char(view.last_line() - PADDING);
175183 view.state.selection = Selection::single(pos, pos);
176184 }
177185}