using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Apewer.WinForm
{
/// 修饰键。
public struct ModifierKey : IEquatable
{
byte _value;
bool _alt;
bool _ctrl;
bool _shift;
bool _win;
/// 包含 ALT 键。
public bool WithALT { get => _alt; }
/// 包含 CTRL 键。
public bool WithCTRL { get => _ctrl; }
/// 包含 SHIFT 键。
public bool WithSHIFT { get => _shift; }
/// 包含 WIN 键。
public bool WithWIN { get => _win; }
/// 修饰键组合的值。
public byte Value { get => _value; }
///
private ModifierKey(byte value)
{
_alt = value << 7 >> 7 == 1;
_ctrl = value << 6 >> 7 == 1;
_shift = value << 5 >> 7 == 1;
_win = value << 4 >> 7 == 1;
_value = Convert.ToByte(value);
if (_value != value) throw new OverflowException($"参数【{value}】含有无效的键。");
}
private ModifierKey(bool alt, bool ctrl, bool shift, bool win)
{
_alt = alt;
_ctrl = ctrl;
_shift = shift;
_win = win;
var value = 0;
if (alt) value += 0x01;
if (ctrl) value += 0x02;
if (shift) value += 0x04;
if (win) value += 0x05;
_value = Convert.ToByte(value);
}
///
public override int GetHashCode() => _value;
///
public override bool Equals(object obj)
{
if (obj is ModifierKey b) return _value == b._value;
return false;
}
///
public bool Equals(ModifierKey another) => _value == another._value;
///
public static implicit operator byte(ModifierKey instance) => instance._value;
///
///
public static implicit operator ModifierKey(byte value) => new ModifierKey(value);
///
///
public static ModifierKey operator +(ModifierKey a, ModifierKey b)
{
if (a._alt && b._alt) throw new ArgumentException("相加的两个组合键共同包含了 ALT 键。");
if (a._ctrl && b._ctrl) throw new ArgumentException("相加的两个组合键共同包含了 CTRL 键。");
if (a._shift && b._shift) throw new ArgumentException("相加的两个组合键共同包含了 SHIFT 键。");
if (a._win && b._win) throw new ArgumentException("相加的两个组合键共同包含了 WIN 键。");
var alt = a._alt || b._alt;
var ctrl = a._ctrl || b._ctrl;
var shift = a._shift || b._shift;
var win = a._win || b._win;
return new ModifierKey(alt, ctrl, shift, win);
}
///
public static ModifierKey operator -(ModifierKey a, ModifierKey b)
{
var alt = a._alt;
var ctrl = a._ctrl;
var shift = a._shift;
var win = a._win;
if (b._alt) alt = false;
if (b._ctrl) ctrl = false;
if (b._shift) shift = false;
if (b._win) win = false;
return new ModifierKey(alt, ctrl, shift, win);
}
/// 表示 ALT 修饰键。
public static ModifierKey ALT { get; } = new ModifierKey(0x01);
/// 表示 CTRL 修饰键。
public static ModifierKey CTRL { get; } = new ModifierKey(0x02);
/// 表示 SHIFT 修饰键。
public static ModifierKey SHIFT { get; } = new ModifierKey(0x04);
/// 表示 WIN 修饰键。
public static ModifierKey WIN { get; } = new ModifierKey(0x08);
}
}