Skip drawing MultiProgress if backing draw target is hidden (#603)

src/draw_target.rs

@@ -126,12 +126,12 @@ impl ProgressDrawTarget {
     }
 
     /// Returns the current width of the draw target.
-    pub(crate) fn width(&self) -> u16 {
+    pub(crate) fn width(&self) -> Option<u16> {
         match self.kind {
-            TargetKind::Term { ref term, .. } => term.size().1,
+            TargetKind::Term { ref term, .. } => Some(term.size().1),
             TargetKind::Multi { ref state, .. } => state.read().unwrap().width(),
-            TargetKind::Hidden => 0,
-            TargetKind::TermLike { ref inner, .. } => inner.width(),
+            TargetKind::TermLike { ref inner, .. } => Some(inner.width()),
+            TargetKind::Hidden => None,
         }
     }
 

src/multi.rs

@@ -267,7 +267,12 @@ impl MultiState {
         if panicking() {
             return Ok(());
         }
-        let width = self.width() as f64;
+
+        let width = match self.width() {
+            Some(width) => width as f64,
+            None => return Ok(()),
+        };
+
         // Calculate real length based on terminal width
         // This take in account linewrap from terminal
         fn real_len(lines: &[String], width: f64) -> usize {
@@ -393,7 +398,7 @@ impl MultiState {
         ret
     }
 
-    pub(crate) fn width(&self) -> u16 {
+    pub(crate) fn width(&self) -> Option<u16> {
         self.draw_target.width()
     }
 

src/state.rs

@@ -151,10 +151,13 @@ impl BarState {
         } else {
             draw_state.lines.extend(lines);
         }
+
         draw_state.orphan_lines_count = draw_state.lines.len();
-        if !matches!(self.state.status, Status::DoneHidden) {
-            self.style
-                .format_state(&self.state, &mut draw_state.lines, width);
+        if let Some(width) = width {
+            if !matches!(self.state.status, Status::DoneHidden) {
+                self.style
+                    .format_state(&self.state, &mut draw_state.lines, width);
+            }
         }
 
         drop(draw_state);
@@ -188,9 +191,11 @@ impl BarState {
 
         let mut draw_state = drawable.state();
 
-        if !matches!(self.state.status, Status::DoneHidden) {
-            self.style
-                .format_state(&self.state, &mut draw_state.lines, width);
+        if let Some(width) = width {
+            if !matches!(self.state.status, Status::DoneHidden) {
+                self.style
+                    .format_state(&self.state, &mut draw_state.lines, width);
+            }
         }
 
         drop(draw_state);