48 lines
1.7 KiB
Zig
48 lines
1.7 KiB
Zig
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const std = @import("std");
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const Signal = @import("signal.zig").Signal;
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const Delegate = @import("delegate.zig").Delegate;
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/// helper used to connect and disconnect listeners on the fly from a Signal. Listeners are wrapped in Delegates
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/// and can be either free functions or functions bound to a struct.
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pub fn Sink(comptime Event: type) type {
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return struct {
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const Self = @This();
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/// the Signal this Sink is temporarily wrapping
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var owning_signal: *Signal(Event) = undefined;
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pub fn init(signal: *Signal(Event)) Self {
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owning_signal = signal;
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return Self{};
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}
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pub fn connect(self: Self, callback: fn (Event) void) void {
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self.disconnect(callback);
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_ = owning_signal.calls.append(Delegate(Event).initFree(callback)) catch unreachable;
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}
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pub fn connectBound(self: Self, ctx: var, comptime fn_name: []const u8) void {
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self.disconnectBound(ctx);
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_ = owning_signal.calls.append(Delegate(Event).initBound(ctx, fn_name)) catch unreachable;
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}
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pub fn disconnect(self: Self, callback: fn (Event) void) void {
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for (owning_signal.calls.items) |call, i| {
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if (call.containsFree(callback)) {
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_ = owning_signal.calls.swapRemove(i);
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break;
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}
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}
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}
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pub fn disconnectBound(self: Self, ctx: var) void {
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for (owning_signal.calls.items) |call, i| {
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if (call.containsBound(ctx)) {
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_ = owning_signal.calls.swapRemove(i);
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break;
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}
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}
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}
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};
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}
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