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// 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 Error = @import("../command.zig").Error;
const Direction = @import("../command.zig").Direction;
const Seat = @import("../Seat.zig");
const View = @import("../View.zig");
const ViewStack = @import("../view_stack.zig").ViewStack;
/// Focus either the next or the previous visible view, depending on the enum
/// passed. Does nothing if there are 1 or 0 views in the stack.
pub fn focus(
allocator: *std.mem.Allocator,
seat: *Seat,
args: []const []const u8,
failure_message: *[]const u8,
) Error!void {
if (args.len < 2) return Error.NotEnoughArguments;
if (args.len > 2) return Error.TooManyArguments;
const direction = try Direction.parse(args[1]);
const output = seat.focused_output;
if (seat.focused_view) |current_focus| {
// If there is a currently focused view, focus the next visible view in the stack.
const focused_node = @fieldParentPtr(ViewStack(View).Node, "view", current_focus);
var it = switch (direction) {
.Next => ViewStack(View).iterator(focused_node, output.current_focused_tags),
.Prev => ViewStack(View).reverseIterator(focused_node, output.current_focused_tags),
};
// Skip past the focused node
_ = it.next();
// Focus the next visible node if there is one
if (it.next()) |node| {
seat.focus(&node.view);
return;
}
}
// There is either no currently focused view or the last visible view in the
// stack is focused and we need to wrap.
var it = switch (direction) {
.Next => ViewStack(View).iterator(output.views.first, output.current_focused_tags),
.Prev => ViewStack(View).reverseIterator(output.views.last, output.current_focused_tags),
};
seat.focus(if (it.next()) |node| &node.view else null);
}
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