wip: component refactor

src/device/plugin.rs

@@ -7,7 +7,8 @@ mod vst3;
 pub struct Plugin {
     name:   String,
     path:   String,
-    plugin: Option<PluginKind>
+    plugin: Option<PluginKind>,
+    parameter_offset: usize,
 }
 
 enum PluginKind {
@@ -24,6 +25,7 @@ impl Plugin {
             name: name.into(),
             path: HELM.into(),
             plugin: None,
+            parameter_offset: 0,
         });
         device.state.lock().unwrap().plugin = Some(self::lv2::plug_in(HELM)?);
         Ok(device)
@@ -40,13 +42,13 @@ pub fn render (state: &Plugin, buf: &mut Buffer, Rect { x, y, .. }: Rect)
     -> Usually<Rect>
 {
     let style = Style::default().gray();
-    buf.set_string(x + 1, y + 1, &format!(" {}", state.name), style.white().bold());
+    buf.set_string(x + 1,  y + 1, &format!(" {}", state.name), style.white().bold());
     buf.set_string(x + 13, y + 1, &format!("│ ...{}...", &HELM[13..30]), style.not_dim());
-    buf.set_string(x + 0, y + 2, &format!("├--------------------------------------┤"), style.dim());
+    buf.set_string(x + 0,  y + 2, &format!("├--------------------------------------┤"), style.dim());
     match &state.plugin {
         Some(PluginKind::LV2(ports, instance)) => {
             let mut height = 3;
-            for (i, port) in ports.iter().enumerate() {
+            for (i, port) in ports.iter().skip(state.parameter_offset).enumerate() {
                 if i >= 10 {
                     break
                 }
@@ -56,7 +58,7 @@ pub fn render (state: &Plugin, buf: &mut Buffer, Rect { x, y, .. }: Rect)
                 ), Style::default());
                 height = height + 1;
             }
-            Ok(draw_box(buf, Rect { x, y, width: 40, height }))
+            Ok(draw_box(buf, Rect { x, y, width: 40, height: height.max(10) }))
         },
         _ => {
             buf.set_string(x + 1, y + 3, &format!(" Parameter 1                      0.0"), style);
@@ -68,6 +70,17 @@ pub fn render (state: &Plugin, buf: &mut Buffer, Rect { x, y, .. }: Rect)
     }
 }
 
-pub fn handle (_: &mut Plugin, _: &AppEvent) -> Usually<bool> {
-    Ok(false)
+pub fn handle (s: &mut Plugin, event: &AppEvent) -> Usually<bool> {
+    handle_keymap(s, event, keymap!(Plugin {
+        [Up,   NONE, "cursor_up",   "move cursor up",
+            |s: &mut Plugin|{
+                s.parameter_offset = s.parameter_offset.saturating_sub(1);
+                Ok(true)
+            }],
+        [Down, NONE, "cursor_down", "move cursor down",
+            |s: &mut Plugin|{
+                s.parameter_offset = s.parameter_offset + 1;
+                Ok(true)
+            }]
+    }))
 }