in swiftUI exist .keyboardShortcut() modifier:
// run "doSomeAction()" on press of "b" key on the keyboard
Button("SomeBtn") { doSomeAction() }
.keyboardShortcut("b", modifiers: [])
but for usage of this modifier you need to have an instance of button.
Question is -- is there are possible to apply some modifier without creation of any useless Views?
What if I need to have 20 actions assigned to some keyboard keys?
Do I need to create 20 buttons and make it invisible even if this is really bad for performance?
CodePudding user response：
Profits of this solution:
- Its works faster than
.keyboardShortcut()way - It does not need to create extra views/buttons;
- it's works on ANY keyboard layout (
.keyboardShortcut()works ONLY IN ONE keyboard layout);
Solution example:
struct WindowView: View {
@ObservedObject var model: WindowModel
init(model: WindowModel) {
self.model = model
// THIS IS FINAL SOLUTION
HotKeys.subscription(combinations: model.hotkeys)
}
var body: some View {
Text("some text")
.padding(60)
}
}
hotkeys initialisation inside ViewModel:
// THIS IS FINAL SOLUTION
let hotkeys: [HotkeyCombination] = [
HotkeyCombination(keyBase: [], key: .kVK_ANSI_Q) { print("Q") },
HotkeyCombination(keyBase: [.option], key: .kVK_ANSI_Q) { print("Option Q") }
]
Files to use my solution:
HotKeys.swift :
import Foundation
import SwiftUI
class HotKeys {
static func subscription(combinations: [HotkeyCombination] ){
NSEvent.addLocalMonitorForEvents(matching: .keyDown) { _ in hotkeysSubscription(combinations: combinations)
return nil
}
}
}
fileprivate func hotkeysSubscription(combinations: [HotkeyCombination]) {
var combs = combinations
combs.append(contentsOf: defaultHotkeys() )
for comb in combs {
let basePressedCorrectly = comb.keyBasePressed
if basePressedCorrectly && comb.key.isPressed {
comb.action()
}
}
}
fileprivate func defaultHotkeys() -> [HotkeyCombination] {
var rez: [HotkeyCombination] = []
rez.append (
HotkeyCombination(keyBase: [.command], key: .kVK_ANSI_Q) {
exit(0)
}
)
rez.append (
HotkeyCombination(keyBase: [.command], key: .kVK_ANSI_Comma) {
NSApp.sendAction(Selector(("showPreferencesWindow:")), to: nil, from: nil)
}
)
return rez
}
///////////////////////
///HELPERS
///////////////////////
struct HotkeyCombination {
let keyBase: [KeyBase]
let key: CGKeyCode
let action: () -> ()
}
extension HotkeyCombination {
var keyBasePressed: Bool {
let mustBePressed = KeyBase.allCases.filter{ keyBase.contains($0) }
let mustBeNotPressed = KeyBase.allCases.filter{ !keyBase.contains($0) }
for base in mustBePressed {
if !base.isPressed {
return false
}
}
for base in mustBeNotPressed {
if base.isPressed {
return false
}
}
return true
}
}
enum KeyBase: CaseIterable {
case option
case command
case shift
case control
var isPressed: Bool {
switch self {
case .option:
return CGKeyCode.kVK_Option.isPressed || CGKeyCode.kVK_RightOption.isPressed
case .command:
return CGKeyCode.kVK_Command.isPressed || CGKeyCode.kVK_RightCommand.isPressed
case .shift:
return CGKeyCode.kVK_Shift.isPressed || CGKeyCode.kVK_RightShift.isPressed
case .control:
return CGKeyCode.kVK_Control.isPressed || CGKeyCode.kVK_RightControl.isPressed
}
}
}
CGKeyCode extension taken from:
https://gist.github.com/chipjarred/cbb324c797aec865918a8045c4b51d14
CGKeyCode.swift:
import Foundation
///https://gist.github.com/chipjarred/cbb324c797aec865918a8045c4b51d14
extension CGKeyCode {
static let kVK_ANSI_A : CGKeyCode = 0x00
static let kVK_ANSI_S : CGKeyCode = 0x01
static let kVK_ANSI_D : CGKeyCode = 0x02
static let kVK_ANSI_F : CGKeyCode = 0x03
static let kVK_ANSI_H : CGKeyCode = 0x04
static let kVK_ANSI_G : CGKeyCode = 0x05
static let kVK_ANSI_Z : CGKeyCode = 0x06
static let kVK_ANSI_X : CGKeyCode = 0x07
static let kVK_ANSI_C : CGKeyCode = 0x08
static let kVK_ANSI_V : CGKeyCode = 0x09
static let kVK_ANSI_B : CGKeyCode = 0x0B
static let kVK_ANSI_Q : CGKeyCode = 0x0C
static let kVK_ANSI_W : CGKeyCode = 0x0D
static let kVK_ANSI_E : CGKeyCode = 0x0E
static let kVK_ANSI_R : CGKeyCode = 0x0F
static let kVK_ANSI_Y : CGKeyCode = 0x10
static let kVK_ANSI_T : CGKeyCode = 0x11
static let kVK_ANSI_1 : CGKeyCode = 0x12
static let kVK_ANSI_2 : CGKeyCode = 0x13
static let kVK_ANSI_3 : CGKeyCode = 0x14
static let kVK_ANSI_4 : CGKeyCode = 0x15
static let kVK_ANSI_6 : CGKeyCode = 0x16
static let kVK_ANSI_5 : CGKeyCode = 0x17
static let kVK_ANSI_Equal : CGKeyCode = 0x18
static let kVK_ANSI_9 : CGKeyCode = 0x19
static let kVK_ANSI_7 : CGKeyCode = 0x1A
static let kVK_ANSI_Minus : CGKeyCode = 0x1B
static let kVK_ANSI_8 : CGKeyCode = 0x1C
static let kVK_ANSI_0 : CGKeyCode = 0x1D
static let kVK_ANSI_RightBracket : CGKeyCode = 0x1E
static let kVK_ANSI_O : CGKeyCode = 0x1F
static let kVK_ANSI_U : CGKeyCode = 0x20
static let kVK_ANSI_LeftBracket : CGKeyCode = 0x21
static let kVK_ANSI_I : CGKeyCode = 0x22
static let kVK_ANSI_P : CGKeyCode = 0x23
static let kVK_ANSI_L : CGKeyCode = 0x25
static let kVK_ANSI_J : CGKeyCode = 0x26
static let kVK_ANSI_Quote : CGKeyCode = 0x27
static let kVK_ANSI_K : CGKeyCode = 0x28
static let kVK_ANSI_Semicolon : CGKeyCode = 0x29
static let kVK_ANSI_Backslash : CGKeyCode = 0x2A
static let kVK_ANSI_Comma : CGKeyCode = 0x2B
static let kVK_ANSI_Slash : CGKeyCode = 0x2C
static let kVK_ANSI_N : CGKeyCode = 0x2D
static let kVK_ANSI_M : CGKeyCode = 0x2E
static let kVK_ANSI_Period : CGKeyCode = 0x2F
static let kVK_ANSI_Grave : CGKeyCode = 0x32
static let kVK_ANSI_KeypadDecimal : CGKeyCode = 0x41
static let kVK_ANSI_KeypadMultiply : CGKeyCode = 0x43
static let kVK_ANSI_KeypadPlus : CGKeyCode = 0x45
static let kVK_ANSI_KeypadClear : CGKeyCode = 0x47
static let kVK_ANSI_KeypadDivide : CGKeyCode = 0x4B
static let kVK_ANSI_KeypadEnter : CGKeyCode = 0x4C
static let kVK_ANSI_KeypadMinus : CGKeyCode = 0x4E
static let kVK_ANSI_KeypadEquals : CGKeyCode = 0x51
static let kVK_ANSI_Keypad0 : CGKeyCode = 0x52
static let kVK_ANSI_Keypad1 : CGKeyCode = 0x53
static let kVK_ANSI_Keypad2 : CGKeyCode = 0x54
static let kVK_ANSI_Keypad3 : CGKeyCode = 0x55
static let kVK_ANSI_Keypad4 : CGKeyCode = 0x56
static let kVK_ANSI_Keypad5 : CGKeyCode = 0x57
static let kVK_ANSI_Keypad6 : CGKeyCode = 0x58
static let kVK_ANSI_Keypad7 : CGKeyCode = 0x59
static let kVK_ANSI_Keypad8 : CGKeyCode = 0x5B
static let kVK_ANSI_Keypad9 : CGKeyCode = 0x5C
// keycodes for keys that are independent of keyboard layout
static let kVK_Return : CGKeyCode = 0x24
static let kVK_Tab : CGKeyCode = 0x30
static let kVK_Space : CGKeyCode = 0x31
static let kVK_Delete : CGKeyCode = 0x33
static let kVK_Escape : CGKeyCode = 0x35
static let kVK_Command : CGKeyCode = 0x37
static let kVK_Shift : CGKeyCode = 0x38
static let kVK_CapsLock : CGKeyCode = 0x39
static let kVK_Option : CGKeyCode = 0x3A
static let kVK_Control : CGKeyCode = 0x3B
static let kVK_RightCommand : CGKeyCode = 0x36 // Out of order
static let kVK_RightShift : CGKeyCode = 0x3C
static let kVK_RightOption : CGKeyCode = 0x3D
static let kVK_RightControl : CGKeyCode = 0x3E
static let kVK_Function : CGKeyCode = 0x3F
static let kVK_F17 : CGKeyCode = 0x40
static let kVK_VolumeUp : CGKeyCode = 0x48
static let kVK_VolumeDown : CGKeyCode = 0x49
static let kVK_Mute : CGKeyCode = 0x4A
static let kVK_F18 : CGKeyCode = 0x4F
static let kVK_F19 : CGKeyCode = 0x50
static let kVK_F20 : CGKeyCode = 0x5A
static let kVK_F5 : CGKeyCode = 0x60
static let kVK_F6 : CGKeyCode = 0x61
static let kVK_F7 : CGKeyCode = 0x62
static let kVK_F3 : CGKeyCode = 0x63
static let kVK_F8 : CGKeyCode = 0x64
static let kVK_F9 : CGKeyCode = 0x65
static let kVK_F11 : CGKeyCode = 0x67
static let kVK_F13 : CGKeyCode = 0x69
static let kVK_F16 : CGKeyCode = 0x6A
static let kVK_F14 : CGKeyCode = 0x6B
static let kVK_F10 : CGKeyCode = 0x6D
static let kVK_F12 : CGKeyCode = 0x6F
static let kVK_F15 : CGKeyCode = 0x71
static let kVK_Help : CGKeyCode = 0x72
static let kVK_Home : CGKeyCode = 0x73
static let kVK_PageUp : CGKeyCode = 0x74
static let kVK_ForwardDelete : CGKeyCode = 0x75
static let kVK_F4 : CGKeyCode = 0x76
static let kVK_End : CGKeyCode = 0x77
static let kVK_F2 : CGKeyCode = 0x78
static let kVK_PageDown : CGKeyCode = 0x79
static let kVK_F1 : CGKeyCode = 0x7A
static let kVK_LeftArrow : CGKeyCode = 0x7B
static let kVK_RightArrow : CGKeyCode = 0x7C
static let kVK_DownArrow : CGKeyCode = 0x7D
static let kVK_UpArrow : CGKeyCode = 0x7E
// ISO keyboards only
static let kVK_ISO_Section : CGKeyCode = 0x0A
// JIS keyboards only
static let kVK_JIS_Yen : CGKeyCode = 0x5D
static let kVK_JIS_Underscore : CGKeyCode = 0x5E
static let kVK_JIS_KeypadComma : CGKeyCode = 0x5F
static let kVK_JIS_Eisu : CGKeyCode = 0x66
static let kVK_JIS_Kana : CGKeyCode = 0x68
var isModifier: Bool {
return (.kVK_RightCommand...(.kVK_Function)).contains(self)
}
var baseModifier: CGKeyCode?
{
if (.kVK_Command...(.kVK_Control)).contains(self)
|| self == .kVK_Function
{
return self
}
switch self
{
case .kVK_RightShift: return .kVK_Shift
case .kVK_RightCommand: return .kVK_Command
case .kVK_RightOption: return .kVK_Option
case .kVK_RightControl: return .kVK_Control
default: return nil
}
}
var isPressed: Bool {
CGEventSource.keyState(.combinedSessionState, key: self)
}
}