implement scrolling for help popup

3 files changed, 43 insertions, 14 deletions

diff --git a/src/tui/commands.rs b/src/tui/commands.rs
index 6a2ab13..a9566d0 100644
--- a/src/tui/commands.rs
+++ b/src/tui/commands.rs
@@ -52,7 +52,7 @@ pub enum CmdAction {
     // Search list
     SearchList,
     // Reset lists
-    ResetList,
+    Reset,
     // Confirm search/selection
     Confirm,
     // Sort table/list
@@ -140,7 +140,7 @@ impl From<KeyEvent> for CmdAction {
             // Confirm selection
             KeyCode::Enter => Self::Confirm,
             // Reset lists/tables
-            KeyCode::Esc => Self::ResetList,
+            KeyCode::Esc => Self::Reset,
             // Open linked ressource
             KeyCode::Char('o') => Self::Open(OpenRessource::Pdf),
             // KeyCode::Char('u') => Self::Open(OpenRessource::WebLink),
diff --git a/src/tui/popup.rs b/src/tui/popup.rs
index 20ff467..fe76956 100644
--- a/src/tui/popup.rs
+++ b/src/tui/popup.rs
@@ -35,6 +35,7 @@ pub struct PopupArea {
     pub is_popup: bool,
     pub popup_kind: Option<PopupKind>,
     pub popup_message: String,
+    pub popup_scroll_pos: u16,
     pub popup_list: Vec<String>,
     pub popup_state: ListState,
 }
@@ -45,6 +46,7 @@ impl Default for PopupArea {
             is_popup: false,
             popup_kind: None,
             popup_message: String::new(),
+            popup_scroll_pos: 0,
             popup_list: Vec::new(),
             popup_state: ListState::default(),
         }
@@ -146,9 +148,11 @@ impl PopupArea {
         self.is_popup = true;
     }
 
-    pub fn popup_close_message(&mut self) {
-        self.is_popup = false;
-        self.popup_message.clear();
-        self.popup_kind = None
+    pub fn popup_scroll_down(&mut self) {
+        self.popup_scroll_pos = self.popup_scroll_pos.saturating_add(1)
+    }
+
+    pub fn popup_scroll_up(&mut self) {
+        self.popup_scroll_pos = self.popup_scroll_pos.saturating_sub(1)
     }
 }
diff --git a/src/tui/ui.rs b/src/tui/ui.rs
index 260f401..dd08291 100644
--- a/src/tui/ui.rs
+++ b/src/tui/ui.rs
@@ -37,7 +37,7 @@ use ratatui::{
         ScrollbarOrientation, Table, Wrap,
     },
 };
-use tui_popup::Popup;
+use tui_popup::{Popup, SizedWrapper};
 
 // Text colors
 const TEXT_FG_COLOR: Color = Color::Indexed(TEXT_FG_COLOR_INDEX);
@@ -151,19 +151,44 @@ pub fn render_ui(app: &mut App, frame: &mut Frame) {
 }
 
 pub fn render_popup(app: &mut App, frame: &mut Frame) {
-    let popup = if let Some(PopupKind::Help) = app.bibiman.popup_area.popup_kind {
-        Popup::new(PopupArea::popup_help())
+    if let Some(PopupKind::Help) = app.bibiman.popup_area.popup_kind {
+        let text: Text = Text::from(PopupArea::popup_help());
+
+        // Calculate max scroll position depending on hight of terminal window
+        let scroll_pos = if app.bibiman.popup_area.popup_scroll_pos
+            > text.lines.len() as u16 - (frame.area().height / 2)
+        {
+            app.bibiman.popup_area.popup_scroll_pos =
+                text.lines.len() as u16 - (frame.area().height / 2);
+            app.bibiman.popup_area.popup_scroll_pos
+        } else {
+            app.bibiman.popup_area.popup_scroll_pos
+        };
+
+        let par = Paragraph::new(text).scroll((scroll_pos, 0));
+
+        // Needed to use scrollable Parapgraph as popup content
+        let sized_par = SizedWrapper {
+            inner: par,
+            width: (frame.area().width / 2) as usize,
+            height: (frame.area().height / 2) as usize,
+        };
+
+        let popup = Popup::new(sized_par)
             .title(" Keybindings ".bold().into_centered_line())
             .style(POPUP_HELP_BOX)
-            .border_style(Style::new().fg(MAIN_BLUE))
+            .border_style(Style::new().fg(MAIN_BLUE));
+
+        frame.render_widget_ref(popup, frame.area())
     } else if let Some(PopupKind::Message) = app.bibiman.popup_area.popup_kind {
-        Popup::new(Text::from(app.bibiman.popup_area.popup_message.as_str()).fg(MAIN_GREEN))
-            .title(" Message ".bold().into_centered_line().fg(MAIN_GREEN))
-            .style(POPUP_HELP_BOX)
+        let popup =
+            Popup::new(Text::from(app.bibiman.popup_area.popup_message.as_str()).fg(MAIN_GREEN))
+                .title(" Message ".bold().into_centered_line().fg(MAIN_GREEN))
+                .style(POPUP_HELP_BOX);
+        frame.render_widget(&popup, frame.area())
     } else {
         panic!("No popup text detected")
     };
-    frame.render_widget(&popup, frame.area())
 }
 
 pub fn render_header(frame: &mut Frame, rect: Rect) {