151 lines
4.5 KiB
Swift
151 lines
4.5 KiB
Swift
//
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// SignalData.swift
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// Adwaita
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//
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// Created by david-swift on 31.07.24.
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//
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import CAdw
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/// Data to pass to signal handlers.
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public class SignalData {
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/// The closure.
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public var closure: ([Any?]) -> Any?
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/// Destroy the class.
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public var selfDestruction: (() -> Void)?
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/// The closure as a C handler.
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var handler: @convention(c) (UnsafeMutableRawPointer, UnsafeMutableRawPointer) -> Void {
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{ _, data in
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let data = unsafeBitCast(data, to: SignalData.self)
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_ = data.closure([])
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}
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}
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/// The closure as a C handler with three parameters.
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var threeParamsHandler: @convention(c) (
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UnsafeMutableRawPointer,
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UnsafeRawPointer?,
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UnsafeMutableRawPointer
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) -> Void {
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{ _, arg1, data in
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let data = unsafeBitCast(data, to: SignalData.self)
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_ = data.closure([arg1])
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}
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}
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/// The closure as a C handler with four parameters.
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var fourParamsHandler: @convention(c) (
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UnsafeMutableRawPointer,
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UnsafeRawPointer?,
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UnsafeRawPointer?,
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UnsafeMutableRawPointer
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) -> Void {
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{ _, arg1, arg2, data in
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let data = unsafeBitCast(data, to: SignalData.self)
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_ = data.closure([arg1, arg2])
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}
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}
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/// The closure as a C handler with five parameters.
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var fiveParamsHandler: @convention(c) (
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UnsafeMutableRawPointer,
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UnsafeRawPointer?,
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Double,
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Double,
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UnsafeMutableRawPointer
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) -> Void {
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{ _, arg1, arg2, arg3, data in
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let data = unsafeBitCast(data, to: SignalData.self)
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_ = data.closure([arg1, arg2, arg3])
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}
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}
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/// The closure as a C handler with a return value.
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var boolHandler: @convention(c) (UnsafeMutableRawPointer, UnsafeMutableRawPointer) -> Bool {
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{ _, data in
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let data = unsafeBitCast(data, to: SignalData.self)
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return data.closure([]) as? Bool ?? false
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}
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}
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/// Initialize the signal data.
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/// - Parameters:
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/// - closure: The signal's closure.
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/// - destroy: The self destruction.
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public convenience init(closure: @escaping () -> Any?, destroy: (() -> Void)? = nil) {
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self.init(closure: { _ in closure() }, destroy: destroy)
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}
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/// Initialize the signal data.
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/// - Parameters:
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/// - closure: The signal's closure.
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/// - destroy: The self destruction.
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public convenience init(closure: @escaping () -> Void, destroy: (() -> Void)? = nil) {
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self.init(closure: { _ in closure(); return nil }, destroy: destroy)
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}
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/// Initialize the signal data.
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/// - Parameters:
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/// - closure: The signal's closure.
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/// - destroy: The self destruction.
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public init(closure: @escaping ([Any]) -> Any?, destroy: (() -> Void)? = nil) {
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self.closure = closure
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self.selfDestruction = destroy
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}
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/// The return type.
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public enum ReturnType {
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/// Returns a boolean.
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case bool
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}
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/// Connect the signal data to a signal.
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/// - Parameters:
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/// - pointer: The pointer to the object which holds the signal.
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/// - signal: The signal's name.
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/// - argCount: The number of arguments.
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/// - return: The return type.
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public func connect(
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pointer: UnsafeMutableRawPointer?,
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signal: String,
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argCount: Int = 0,
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return: ReturnType? = nil
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) {
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let callback: GCallback
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if let `return` {
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switch `return` {
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case .bool:
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callback = unsafeBitCast(boolHandler, to: GCallback.self)
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}
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} else if argCount >= 3 {
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callback = unsafeBitCast(fiveParamsHandler, to: GCallback.self)
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} else if argCount == 2 {
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callback = unsafeBitCast(fourParamsHandler, to: GCallback.self)
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} else if argCount == 1 {
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callback = unsafeBitCast(threeParamsHandler, to: GCallback.self)
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} else {
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callback = unsafeBitCast(handler, to: GCallback.self)
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}
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let destroy: GClosureNotify = { data, _ in
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guard let data else {
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return
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}
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let signalData: SignalData = Unmanaged.fromOpaque(data).takeUnretainedValue()
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signalData.selfDestruction?()
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}
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g_signal_connect_data(
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pointer,
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signal,
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callback,
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Unmanaged.passUnretained(self).toOpaque().cast(),
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destroy,
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G_CONNECT_AFTER
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)
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}
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}
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