From ac735719cfc086c54ff939786823b29de2c24c0a Mon Sep 17 00:00:00 2001
From: Isaac Freund <ifreund@ifreund.xyz>
Date: Fri, 8 May 2020 14:51:10 +0200
Subject: Implement initial Xwayland support

---
 src/View.zig | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 62 insertions(+), 6 deletions(-)

(limited to 'src/View.zig')

diff --git a/src/View.zig b/src/View.zig
index 51e0b98..32924b4 100644
--- a/src/View.zig
+++ b/src/View.zig
@@ -17,6 +17,7 @@
 
 const Self = @This();
 
+const build_options = @import("build_options");
 const std = @import("std");
 
 const c = @import("c.zig");
@@ -27,13 +28,18 @@ const Output = @import("Output.zig");
 const Root = @import("Root.zig");
 const ViewStack = @import("view_stack.zig").ViewStack;
 const XdgToplevel = @import("XdgToplevel.zig");
+const XwaylandView = if (build_options.xwayland)
+    @import("XwaylandView.zig")
+else
+    @import("VoidView.zig");
 
-const ViewImpl = union(enum) {
+const Impl = union(enum) {
     xdg_toplevel: XdgToplevel,
+    xwayland_view: XwaylandView,
 };
 
 /// The implementation of this view
-impl: ViewImpl,
+impl: Impl,
 
 /// The output this view is currently associated with
 output: *Output,
@@ -63,11 +69,11 @@ pending_serial: ?u32,
 // This is what we render while a transaction is in progress
 stashed_buffer: ?*c.wlr_buffer,
 
-pub fn init_xdg_toplevel(
+pub fn init(
     self: *Self,
     output: *Output,
     tags: u32,
-    wlr_xdg_surface: *c.wlr_xdg_surface,
+    surface: var,
 ) void {
     self.output = output;
 
@@ -90,8 +96,13 @@ pub fn init_xdg_toplevel(
 
     self.stashed_buffer = null;
 
-    self.impl = .{ .xdg_toplevel = undefined };
-    self.impl.xdg_toplevel.init(self, wlr_xdg_surface);
+    if (@TypeOf(surface) == *c.wlr_xdg_surface) {
+        self.impl = .{ .xdg_toplevel = undefined };
+        self.impl.xdg_toplevel.init(self, surface);
+    } else if (build_options.xwayland and @TypeOf(surface) == *c.wlr_xwayland_surface) {
+        self.impl = .{ .xwayland_view = undefined };
+        self.impl.xwayland_view.init(self, surface);
+    } else unreachable;
 }
 
 pub fn deinit(self: *Self) void {
@@ -113,6 +124,7 @@ pub fn configure(self: Self) void {
     if (self.pending_box) |pending_box| {
         switch (self.impl) {
             .xdg_toplevel => |xdg_toplevel| xdg_toplevel.configure(pending_box),
+            .xwayland_view => |xwayland_view| xwayland_view.configure(pending_box),
         }
     } else {
         Log.Error.log("Configure called on a View with no pending box", .{});
@@ -148,6 +160,7 @@ pub fn setFocused(self: *Self, focused: bool) void {
     self.focused = focused;
     switch (self.impl) {
         .xdg_toplevel => |xdg_toplevel| xdg_toplevel.setActivated(focused),
+        .xwayland_view => |xwayland_view| xwayland_view.setActivated(focused),
     }
 }
 
@@ -186,6 +199,7 @@ pub fn sendToOutput(self: *Self, destination_output: *Output) void {
 pub fn close(self: Self) void {
     switch (self.impl) {
         .xdg_toplevel => |xdg_toplevel| xdg_toplevel.close(),
+        .xwayland_view => |xwayland_view| xwayland_view.close(),
     }
 }
 
@@ -196,5 +210,47 @@ pub fn forEachSurface(
 ) void {
     switch (self.impl) {
         .xdg_toplevel => |xdg_toplevel| xdg_toplevel.forEachSurface(iterator, user_data),
+        .xwayland_view => |xwayland_view| xwayland_view.forEachSurface(iterator, user_data),
     }
 }
+
+/// Return the surface at output coordinates ox, oy and set sx, sy to the
+/// corresponding surface-relative coordinates, if there is a surface.
+pub fn surfaceAt(self: Self, ox: f64, oy: f64, sx: *f64, sy: *f64) ?*c.wlr_surface {
+    return switch (self.impl) {
+        .xdg_toplevel => |xdg_toplevel| xdg_toplevel.surfaceAt(ox, oy, sx, sy),
+        .xwayland_view => |xwayland_view| xwayland_view.surfaceAt(ox, oy, sx, sy),
+    };
+}
+
+/// Called by the impl when the surface is ready to be displayed
+pub fn map(self: *Self) void {
+    const root = self.output.root;
+
+    // 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;
+    while (it) |seat_node| : (it = seat_node.next) {
+        seat_node.data.focus(self);
+    }
+
+    c.wlr_surface_send_enter(self.wlr_surface.?, self.output.wlr_output);
+
+    root.arrange();
+}
+
+/// Called by the impl when the surface will no longer be displayed
+pub fn unmap(self: *Self) void {
+    const root = self.output.root;
+
+    self.wlr_surface = null;
+
+    // Inform all seats that the view has been unmapped so they can handle focus
+    var it = root.server.input_manager.seats.first;
+    while (it) |node| : (it = node.next) {
+        const seat = &node.data;
+        seat.handleViewUnmap(self);
+    }
+
+    root.arrange();
+}
-- 
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