1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
|
const std = @import("std");
const c = @import("c.zig").c;
const Output = @import("output.zig").Output;
const Server = @import("server.zig").Server;
const Seat = @import("seat.zig").Seat;
const View = @import("view.zig").View;
/// Responsible for all windowing operations
pub const Root = struct {
const Self = @This();
server: *Server,
wlr_output_layout: *c.wlr_output_layout,
outputs: std.TailQueue(Output),
// Must stay ordered, first N views in list are the masters
views: std.TailQueue(View),
unmapped_views: std.TailQueue(View),
focused_view: ?*View,
// Number of pending configures sent in the current transaction.
// A value of 0 means there is no current transaction.
pending_count: u32,
pub fn init(self: *Self, server: *Server) !void {
self.server = server;
// Create an output layout, which a wlroots utility for working with an
// arrangement of screens in a physical layout.
self.wlr_output_layout = c.wlr_output_layout_create() orelse
return error.CantCreateWlrOutputLayout;
errdefer c.wlr_output_layout_destroy(self.wlr_output_layout);
self.outputs = std.TailQueue(Output).init();
self.views = std.TailQueue(View).init();
self.unmapped_views = std.TailQueue(View).init();
self.focused_view = null;
self.pending_count = 0;
}
pub fn destroy(self: *Self) void {
c.wlr_output_layout_destroy(self.wlr_output_layout);
}
pub fn addOutput(self: *Self, wlr_output: *c.wlr_output) void {
// TODO: Handle failure
const node = self.outputs.allocateNode(self.server.allocator) catch unreachable;
node.data.init(self, wlr_output) catch unreachable;
self.outputs.append(node);
}
pub fn addView(self: *Self, wlr_xdg_surface: *c.wlr_xdg_surface) void {
const node = self.views.allocateNode(self.server.allocator) catch unreachable;
node.data.init(self, wlr_xdg_surface);
self.unmapped_views.append(node);
}
/// Finds the topmost view under the output layout coordinates lx, ly
/// returns the view if found, and a pointer to the wlr_surface as well as the surface coordinates
pub fn viewAt(self: *Self, lx: f64, ly: f64, surface: *?*c.wlr_surface, sx: *f64, sy: *f64) ?*View {
var it = self.views.last;
while (it) |node| : (it = node.prev) {
if (node.data.isAt(lx, ly, surface, sx, sy)) {
return &node.data;
}
}
return null;
}
/// Focus the next view in the stack, wrapping if needed. Does nothing
/// if there is only one view in the stack.
pub fn focusNextView(self: *Self) void {
if (self.focused_view) |current_focus| {
// If there is a currently focused view, focus the next view in the stack.
const node = @fieldParentPtr(std.TailQueue(View).Node, "data", current_focus);
if (node.next) |next_node| {
const view = &next_node.data;
view.focus(view.wlr_xdg_surface.surface);
return;
}
}
// There is either no currently focused view or the last view in the
// stack is focused and we need to wrap.
if (self.views.first) |first_node| {
const view = &first_node.data;
view.focus(view.wlr_xdg_surface.surface);
}
}
/// Focus the previous view in the stack, wrapping if needed. Does nothing
/// if there is only one view in the stack.
pub fn focusPrevView(self: *Self) void {
if (self.focused_view) |current_focus| {
// If there is a currently focused view, focus the previous view in the stack.
const node = @fieldParentPtr(std.TailQueue(View).Node, "data", current_focus);
if (node.prev) |prev_node| {
const view = &prev_node.data;
view.focus(view.wlr_xdg_surface.surface);
return;
}
}
// There is either no currently focused view or the first view in the
// stack is focused and we need to wrap.
if (self.views.last) |last_node| {
const view = &last_node.data;
view.focus(view.wlr_xdg_surface.surface);
}
}
pub fn arrange(self: *Self) void {
if (self.views.len == 0) {
return;
}
// Super basic vertical layout for now, no master/slave stuff
// This can't return null if pass null as the reference
const output_box: *c.wlr_box = c.wlr_output_layout_get_box(self.wlr_output_layout, null);
const new_height = output_box.height;
// Allow for a 10px gap
const num_views = @intCast(c_int, self.views.len);
const new_width = @divTrunc(output_box.width, num_views) - (num_views - 1) * 10;
var x: c_int = 0;
var y: c_int = 0;
var it = self.views.first;
while (it) |node| : (it = node.next) {
const view = &node.data;
view.pending_state.x = x;
view.pending_state.y = y;
view.pending_state.width = @intCast(u32, new_width);
view.pending_state.height = @intCast(u32, new_height);
x += new_width + 10;
}
self.startTransaction();
}
/// Initiate an atomic change to the layout. This change will not be
/// applied until all affected clients ack a configure and commit a buffer.
fn startTransaction(self: *Self) void {
std.debug.assert(self.pending_count == 0);
var it = self.views.first;
while (it) |node| : (it = node.next) {
const view = &node.data;
if (view.needsConfigure()) {
view.configurePending();
self.pending_count += 1;
// We save the current buffer, so we can send an early
// frame done event to give the client a head start on
// redrawing.
view.sendFrameDone();
}
view.stashBuffer();
}
// TODO: start a timer and handle timeout waiting for all clients to ack
}
pub fn notifyConfigured(self: *Self) void {
self.pending_count -= 1;
if (self.pending_count == 0) {
self.commitTransaction();
}
}
/// Apply the pending state and drop stashed buffers. This means that
/// the next frame drawn will be the post-transaction state of the
/// layout. Must only be called after all clients have configured for
/// the new layout.
fn commitTransaction(self: *Self) void {
// TODO: apply damage properly
var it = self.views.first;
while (it) |node| : (it = node.next) {
const view = &node.data;
// TODO: handle views that timed out
view.current_state = view.pending_state;
view.dropStashedBuffer();
}
}
};
|
