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@ -185,6 +185,8 @@ impl Menu {
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fn action_page_down(&mut self) -> Action {
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let lines = self.lines.len();
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// fewer lines than visible rows, just select last link
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if lines < self.rows() {
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if !self.links.is_empty() {
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self.link = self.links.len() - 1;
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@ -193,8 +195,16 @@ impl Menu {
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return Action::None;
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}
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if lines > SCROLL_LINES && self.scroll < lines - SCROLL_LINES {
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let padding = self.padding_bottom();
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if self.scroll <= padding {
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self.scroll += SCROLL_LINES;
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if self.scroll > padding {
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self.scroll = padding;
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if !self.links.is_empty() {
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self.link = self.links.len() - 1;
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return Action::Redraw;
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}
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}
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if let Some(dir) = self.link_visibility(self.link) {
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match dir {
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LinkDir::Above => {
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@ -295,16 +305,24 @@ impl Menu {
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}
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}
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// how many rows to pad with blank lines at the end of the page
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fn padding_bottom(&self) -> usize {
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let padding = (self.rows() as f64 * 0.75) as usize;
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let lines = self.lines.len();
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if lines > padding {
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lines - padding
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} else {
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0
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}
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}
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fn action_down(&mut self) -> Action {
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let new_link = self.link + 1;
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// final link selected already
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if new_link >= self.links.len() {
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// if there are more rows, scroll down
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let rows_from_bottom = (self.rows() as f64 * 0.75) as usize;
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if rows_from_bottom <= self.links.len()
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&& self.scroll < self.links.len() - rows_from_bottom
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{
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if self.scroll < self.padding_bottom() {
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self.scroll += 1;
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return Action::Redraw;
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} else {
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