From ff1954f9a9917e6104fc94e2d81488f856ef6be4 Mon Sep 17 00:00:00 2001
From: Keith Simmons <keith@the-simmons.net>
Date: Mon, 21 Dec 2020 16:00:29 -0800
Subject: [PATCH] allow font changing

---
 src/editor/mod.rs    |  3 +++
 src/editor/window.rs | 20 +++++++++++++++++++-
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/src/editor/mod.rs b/src/editor/mod.rs
index a5df711..d644650 100644
--- a/src/editor/mod.rs
+++ b/src/editor/mod.rs
@@ -414,6 +414,9 @@ impl Editor {
             self.draw_command_batcher
                 .queue(DrawCommand::FontChanged(guifont))
                 .ok();
+            for window in self.windows.values() {
+                window.redraw();
+            }
         }
     }
 }
diff --git a/src/editor/window.rs b/src/editor/window.rs
index 9506714..aeb99fb 100644
--- a/src/editor/window.rs
+++ b/src/editor/window.rs
@@ -200,8 +200,12 @@ impl Window {
         *previous_style = style;
     }
 
+    // Send a draw command for the given row starting from current_start up until the next style
+    // change. If the current_start is the same as line_start, this will also work backwards in the
+    // line in order to ensure that ligatures before the beginning of the grid cell are also
+    // updated.
     fn send_draw_command(
-        &mut self,
+        &self,
         row_index: u64,
         line_start: u64,
         current_start: u64,
@@ -346,6 +350,20 @@ impl Window {
         self.send_command(WindowDrawCommand::Clear);
     }
 
+    pub fn redraw(&self) {
+        self.send_command(WindowDrawCommand::Clear);
+        for row in 0..self.grid.height {
+            let mut current_start = 0;
+            while current_start < self.grid.width {
+                if let Some(next_start) = self.send_draw_command(row, 0, current_start) {
+                    current_start = next_start;
+                } else {
+                    break;
+                }
+            }
+        }
+    }
+
     pub fn hide(&self) {
         self.send_command(WindowDrawCommand::Hide);
     }