Only store mapped views in the view stack

src/Output.zig

@@ -147,15 +147,6 @@ pub fn getRenderer(self: Self) *c.wlr_renderer {
     return c.river_wlr_backend_get_renderer(self.wlr_output.backend);
 }
 
-/// Add a new view to the output. arrangeViews() will be called by the view
-/// when it is mapped. The surface argument must be a c.wlr_xdg_surface or
-/// c.wlr_xwayland_surface (if xwayland is enabled)
-pub fn addView(self: *Self, surface: var) !void {
-    const node = try self.root.server.allocator.create(ViewStack(View).Node);
-    node.view.init(self, self.current_focused_tags, surface);
-    self.views.push(node);
-}
-
 /// Add a newly created layer surface to the output.
 pub fn addLayerSurface(self: *Self, wlr_layer_surface: *c.wlr_layer_surface_v1) !void {
     const layer = wlr_layer_surface.client_pending.layer;

src/Server.zig

@@ -190,7 +190,10 @@ fn handleNewXdgSurface(listener: ?*c.wl_listener, data: ?*c_void) callconv(.C) v
 
     Log.Debug.log("New xdg_toplevel", .{});
 
-    self.input_manager.default_seat.focused_output.addView(wlr_xdg_surface) catch unreachable;
+    // The View will add itself to the output's view stack on map
+    const output = self.input_manager.default_seat.focused_output;
+    const node = self.allocator.create(ViewStack(View).Node) catch unreachable;
+    node.view.init(output, output.current_focused_tags, wlr_xdg_surface);
 }
 
 /// This event is raised when the layer_shell recieves a new surface from a client.
@@ -261,5 +264,9 @@ fn handleNewXwaylandSurface(listener: ?*c.wl_listener, data: ?*c_void) callconv(
         "New xwayland surface: title '{}', class '{}'",
         .{ wlr_xwayland_surface.title, wlr_xwayland_surface.class },
     );
-    self.input_manager.default_seat.focused_output.addView(wlr_xwayland_surface) catch unreachable;
+
+    // The View will add itself to the output's view stack on map
+    const output = self.input_manager.default_seat.focused_output;
+    const node = self.allocator.create(ViewStack(View).Node) catch unreachable;
+    node.view.init(output, output.current_focused_tags, wlr_xwayland_surface);
 }

src/View.zig

@@ -105,7 +105,7 @@ pub fn init(
     } else unreachable;
 }
 
-pub fn deinit(self: *Self) void {
+pub fn deinit(self: Self) void {
     if (self.stashed_buffer) |buffer| {
         c.wlr_buffer_unref(buffer);
     }
@@ -227,6 +227,10 @@ pub fn surfaceAt(self: Self, ox: f64, oy: f64, sx: *f64, sy: *f64) ?*c.wlr_surfa
 pub fn map(self: *Self) void {
     const root = self.output.root;
 
+    // Add the view to the stack of its output
+    const node = @fieldParentPtr(ViewStack(Self).Node, "view", self);
+    self.output.views.push(node);
+
     // Focus the newly mapped view. Note: if a seat is focusing a different output
     // it will continue to do so.
     var it = root.server.input_manager.seats.first;
@@ -252,5 +256,16 @@ pub fn unmap(self: *Self) void {
         seat.handleViewUnmap(self);
     }
 
+    // Remove the view from its output's stack
+    const node = @fieldParentPtr(ViewStack(Self).Node, "view", self);
+    self.output.views.remove(node);
+
     root.arrange();
 }
+
+/// Destory the view and free the ViewStack node holding it.
+pub fn destroy(self: *const Self) void {
+    self.deinit();
+    const node = @fieldParentPtr(ViewStack(Self).Node, "view", self);
+    self.output.root.server.allocator.destroy(node);
+}

src/XdgToplevel.zig

@@ -110,10 +110,7 @@ fn handleDestroy(listener: ?*c.wl_listener, data: ?*c_void) callconv(.C) void {
     c.wl_list_remove(&self.listen_map.link);
     c.wl_list_remove(&self.listen_unmap.link);
 
-    // Remove the view from the stack
-    const node = @fieldParentPtr(ViewStack(View).Node, "view", self.view);
-    output.views.remove(node);
-    output.root.server.allocator.destroy(node);
+    self.view.destroy();
 }
 
 /// Called when the xdg surface is mapped, or ready to display on-screen.

src/XwaylandView.zig

@@ -108,17 +108,13 @@ pub fn surfaceAt(self: Self, ox: f64, oy: f64, sx: *f64, sy: *f64) ?*c.wlr_surfa
 /// Called when the xwayland surface is destroyed
 fn handleDestroy(listener: ?*c.wl_listener, data: ?*c_void) callconv(.C) void {
     const self = @fieldParentPtr(Self, "listen_destroy", listener.?);
-    const output = self.view.output;
 
     // Remove listeners that are active for the entire lifetime of the view
     c.wl_list_remove(&self.listen_destroy.link);
     c.wl_list_remove(&self.listen_map.link);
     c.wl_list_remove(&self.listen_unmap.link);
 
-    // Remove the view from the stack
-    const node = @fieldParentPtr(ViewStack(View).Node, "view", self.view);
-    output.views.remove(node);
-    output.root.server.allocator.destroy(node);
+    self.view.destroy();
 }
 
 /// Called when the xwayland surface is mapped, or ready to display on-screen.

src/view_stack.zig

@@ -92,7 +92,7 @@ pub fn ViewStack(comptime T: type) type {
             /// This function is horribly ugly, but it's well tested below.
             pub fn next(self: *Iterator) ?*Node {
                 while (self.it) |node| : (self.it = if (self.reverse) node.prev else node.next) {
-                    if (node.view.wlr_surface != null and if (self.pending)
+                    if (if (self.pending)
                         if (node.view.pending_tags) |pending_tags|
                             self.tags & pending_tags != 0
                         else
@@ -109,7 +109,6 @@ pub fn ViewStack(comptime T: type) type {
 
         /// Returns an iterator starting at the passed node and filtered by
         /// checking the passed tags against the current tags of each view.
-        /// Unmapped views are skipped.
         pub fn iterator(start: ?*Node, tags: u32) Iterator {
             return Iterator{
                 .it = start,
@@ -121,7 +120,6 @@ pub fn ViewStack(comptime T: type) type {
 
         /// Returns a reverse iterator starting at the passed node and filtered by
         /// checking the passed tags against the current tags of each view.
-        /// Unmapped views are skipped.
         pub fn reverseIterator(start: ?*Node, tags: u32) Iterator {
             return Iterator{
                 .it = start,
@@ -133,8 +131,7 @@ pub fn ViewStack(comptime T: type) type {
 
         /// Returns an iterator starting at the passed node and filtered by
         /// checking the passed tags against the pending tags of each view.
-        /// If a view has no pending tags, the current tags are used. Unmapped
-        /// views are skipped.
+        /// If a view has no pending tags, the current tags are used.
         pub fn pendingIterator(start: ?*Node, tags: u32) Iterator {
             return Iterator{
                 .it = start,
@@ -285,51 +282,36 @@ test "iteration (View)" {
     var views: ViewStack(View) = undefined;
     views.init();
 
-    // Pretty nice hack for testing: we don't actually need a wlr_surface here,
-    // but we need the iteration function to thing that the view has a non-null
-    // wlr_surface. So, just cast an integer to a pointer to get an arbitrary
-    // but non-null value. Use 8 so the alignment checks out.
-
     const one_a_pb = try allocator.create(ViewStack(View).Node);
     defer allocator.destroy(one_a_pb);
-    one_a_pb.view.wlr_surface = @intToPtr(*c.wlr_surface, 8);
     one_a_pb.view.current_tags = 1 << 0;
     one_a_pb.view.pending_tags = 1 << 1;
 
     const two_a = try allocator.create(ViewStack(View).Node);
     defer allocator.destroy(two_a);
-    two_a.view.wlr_surface = @intToPtr(*c.wlr_surface, 8);
     two_a.view.current_tags = 1 << 0;
     two_a.view.pending_tags = null;
 
     const three_b_pa = try allocator.create(ViewStack(View).Node);
     defer allocator.destroy(three_b_pa);
-    three_b_pa.view.wlr_surface = @intToPtr(*c.wlr_surface, 8);
     three_b_pa.view.current_tags = 1 << 1;
     three_b_pa.view.pending_tags = 1 << 0;
 
     const four_b = try allocator.create(ViewStack(View).Node);
     defer allocator.destroy(four_b);
-    four_b.view.wlr_surface = @intToPtr(*c.wlr_surface, 8);
     four_b.view.current_tags = 1 << 1;
     four_b.view.pending_tags = null;
 
     const five_b = try allocator.create(ViewStack(View).Node);
     defer allocator.destroy(five_b);
-    five_b.view.wlr_surface = @intToPtr(*c.wlr_surface, 8);
     five_b.view.current_tags = 1 << 1;
     five_b.view.pending_tags = null;
 
-    const unmapped_1 = try allocator.create(ViewStack(View).Node);
-    defer allocator.destroy(unmapped_1);
-    unmapped_1.view.wlr_surface = null;
-
     views.push(three_b_pa); // {3}
     views.push(one_a_pb); // {1, 3}
-    views.push(unmapped_1); // {u, 1, 3}
-    views.push(four_b); // {4, u, 1, 3}
-    views.push(five_b); // {5, 4, u, 1, 3}
-    views.push(two_a); // {2, 5, 4, u, 1, 3}
+    views.push(four_b); // {4, 1, 3}
+    views.push(five_b); // {5, 4, 1, 3}
+    views.push(two_a); // {2, 5, 4, 1, 3}
 
     // Iteration over all tags
     {