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const std = @import("std");
const c = @import("c.zig");
const Box = @import("box.zig").Box;
const Output = @import("output.zig").Output;
const Root = @import("root.zig").Root;
const ViewStack = @import("view_stack.zig").ViewStack;
pub const View = struct {
const Self = @This();
output: *Output,
wlr_xdg_surface: *c.wlr_xdg_surface,
mapped: bool,
current_box: Box,
pending_box: ?Box,
current_tags: u32,
pending_tags: ?u32,
pending_serial: ?u32,
// This is what we render while a transaction is in progress
stashed_buffer: ?*c.wlr_buffer,
// Listeners that are always active over the view's lifetime
listen_destroy: c.wl_listener,
listen_map: c.wl_listener,
listen_unmap: c.wl_listener,
// Listeners that are only active while the view is mapped
listen_commit: c.wl_listener,
pub fn init(self: *Self, output: *Output, wlr_xdg_surface: *c.wlr_xdg_surface, tags: u32) void {
self.output = output;
self.wlr_xdg_surface = wlr_xdg_surface;
// Inform the xdg toplevel that it is tiled.
// For example this prevents firefox from drawing shadows around itself
_ = c.wlr_xdg_toplevel_set_tiled(self.wlr_xdg_surface, c.WLR_EDGE_LEFT |
c.WLR_EDGE_RIGHT | c.WLR_EDGE_TOP | c.WLR_EDGE_BOTTOM);
self.mapped = false;
self.current_box = Box{
.x = 0,
.y = 0,
.height = 0,
.width = 0,
};
self.pending_box = null;
self.current_tags = tags;
self.pending_tags = null;
self.pending_serial = null;
self.stashed_buffer = null;
// Add listeners that are active over the view's entire lifetime
self.listen_destroy.notify = handleDestroy;
c.wl_signal_add(&self.wlr_xdg_surface.events.destroy, &self.listen_destroy);
self.listen_map.notify = handleMap;
c.wl_signal_add(&self.wlr_xdg_surface.events.map, &self.listen_map);
self.listen_unmap.notify = handleUnmap;
c.wl_signal_add(&self.wlr_xdg_surface.events.unmap, &self.listen_unmap);
}
pub fn deinit(self: *Self) void {
if (self.stashed_buffer) |buffer| {
c.wlr_buffer_unref(buffer);
}
}
pub fn needsConfigure(self: Self) bool {
if (self.pending_box) |pending_box| {
return pending_box.width != self.current_box.width or
pending_box.height != self.current_box.height;
} else {
return false;
}
}
pub fn configurePending(self: *Self) void {
if (self.pending_box) |pending_box| {
const border_width = self.output.root.server.config.border_width;
const view_padding = self.output.root.server.config.view_padding;
self.pending_serial = c.wlr_xdg_toplevel_set_size(
self.wlr_xdg_surface,
pending_box.width - border_width * 2 - view_padding * 2,
pending_box.height - border_width * 2 - view_padding * 2,
);
} else {
// TODO: log warning
}
}
pub fn sendFrameDone(self: Self) void {
var now: c.struct_timespec = undefined;
_ = c.clock_gettime(c.CLOCK_MONOTONIC, &now);
c.wlr_surface_send_frame_done(self.wlr_xdg_surface.surface, &now);
}
pub fn dropStashedBuffer(self: *Self) void {
// TODO: log debug error
if (self.stashed_buffer) |buffer| {
c.wlr_buffer_unref(buffer);
self.stashed_buffer = null;
}
}
pub fn stashBuffer(self: *Self) void {
// TODO: log debug error if there is already a saved buffer
const wlr_surface = self.wlr_xdg_surface.surface;
if (c.wlr_surface_has_buffer(wlr_surface)) {
_ = c.wlr_buffer_ref(wlr_surface.*.buffer);
self.stashed_buffer = wlr_surface.*.buffer;
}
}
/// Send a close event to the view's client
pub fn close(self: Self) void {
// Note: we don't call arrange() here as it will be called
// automatically when the view is unmapped.
c.wlr_xdg_toplevel_send_close(self.wlr_xdg_surface);
}
fn handleDestroy(listener: ?*c.wl_listener, data: ?*c_void) callconv(.C) void {
const view = @fieldParentPtr(View, "listen_destroy", listener.?);
const output = view.output;
// Remove listeners that are active for the entire lifetime of the view
c.wl_list_remove(&view.listen_destroy.link);
c.wl_list_remove(&view.listen_map.link);
c.wl_list_remove(&view.listen_unmap.link);
// Remove the view from the stack
const node = @fieldParentPtr(ViewStack(View).Node, "view", view);
output.views.remove(node);
output.root.server.allocator.destroy(node);
}
/// Called when the surface is mapped, or ready to display on-screen.
fn handleMap(listener: ?*c.wl_listener, data: ?*c_void) callconv(.C) void {
const view = @fieldParentPtr(View, "listen_map", listener.?);
const root = view.output.root;
// Add listeners that are only active while mapped
view.listen_commit.notify = handleCommit;
c.wl_signal_add(&view.wlr_xdg_surface.surface.*.events.commit, &view.listen_commit);
view.mapped = true;
// 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(view);
}
view.output.root.arrange();
}
/// Called when the surface is unmapped and will no longer be displayed.
fn handleUnmap(listener: ?*c.wl_listener, data: ?*c_void) callconv(.C) void {
const view = @fieldParentPtr(View, "listen_unmap", listener.?);
const root = view.output.root;
view.mapped = false;
// 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(view);
}
root.arrange();
// Remove listeners that are only active while mapped
c.wl_list_remove(&view.listen_commit.link);
}
fn handleCommit(listener: ?*c.wl_listener, data: ?*c_void) callconv(.C) void {
const view = @fieldParentPtr(View, "listen_commit", listener.?);
if (view.pending_serial) |s| {
if (s == view.wlr_xdg_surface.configure_serial) {
view.output.root.notifyConfigured();
view.pending_serial = null;
}
}
// TODO: check for unexpected change in size and react as needed
}
/// Set the active state of the view to the passed bool
pub fn setActivated(self: Self, activated: bool) void {
_ = c.wlr_xdg_toplevel_set_activated(self.wlr_xdg_surface, activated);
}
fn isAt(self: Self, lx: f64, ly: f64, surface: *?*c.wlr_surface, sx: *f64, sy: *f64) bool {
// XDG toplevels may have nested surfaces, such as popup windows for context
// menus or tooltips. This function tests if any of those are underneath the
// coordinates lx and ly (in output Layout Coordinates). If so, it sets the
// surface pointer to that wlr_surface and the sx and sy coordinates to the
// coordinates relative to that surface's top-left corner.
const view_sx = lx - @intToFloat(f64, self.current_box.x);
const view_sy = ly - @intToFloat(f64, self.current_box.y);
// This variable seems to have been unsued in TinyWL
// struct wlr_surface_box *state = &view->xdg_surface->surface->current;
var _sx: f64 = undefined;
var _sy: f64 = undefined;
const _surface = c.wlr_xdg_surface_surface_at(self.wlr_xdg_surface, view_sx, view_sy, &_sx, &_sy);
if (_surface) |surface_at| {
sx.* = _sx;
sy.* = _sy;
surface.* = surface_at;
return true;
}
return false;
}
};
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