1 files changed, 37 insertions, 0 deletions
diff --git a/src/command/mod_master_factor.zig b/src/command/mod_master_factor.zig
new file mode 100644
index 0000000..2e2a73c
--- /dev/null
+++ b/src/command/mod_master_factor.zig
@@ -0,0 +1,37 @@
+// This file is part of river, a dynamic tiling wayland compositor.
+//
+// Copyright 2020 Isaac Freund
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+const std = @import("std");
+
+const c = @import("../c.zig");
+
+const Arg = @import("../Command.zig").Arg;
+const Seat = @import("../Seat.zig");
+
+/// Modify the percent of the width of the screen that the master views occupy.
+pub fn modMasterFactor(seat: *Seat, arg: Arg) void {
+    const delta = arg.float;
+    const output = seat.focused_output;
+    const new_master_factor = std.math.min(
+        std.math.max(output.master_factor + delta, 0.05),
+        0.95,
+    );
+    if (new_master_factor != output.master_factor) {
+        output.master_factor = new_master_factor;
+        seat.input_manager.server.root.arrange();
+    }
+}