[C#][Control]指撥開關控制項的概念與簡易實作

    private SwitchState _state;
    public SwitchState State 
    {
        get
        {
            return _state;
        }
        set
        {
            if (_state == value)
                return;
            _state = value;
            AdjustOnOffButton();
        }
    }
    private void AdjustOnOffButton()
    {
        switch (State)
        {
            case SwitchState.On:
                OnOffButton.Dock = DockStyle.Top;
                break;
            case SwitchState.Off:
                OnOffButton.Dock = DockStyle.Bottom;
                break;
            default:
                break;
        }
    }</pre>

    private void OnOffButton_Click(object sender, EventArgs e)
    {
        Toggle();
    }</pre>

namespace WindowsFormsApplication3 { public partial class SwitchButton : UserControl {

    public enum SwitchState
    {
        On,
        Off
    }

    private SwitchState _state;
    public SwitchState State 
    {
        get
        {
            return _state;
        }
        set
        {
            if (_state == value)
                return;
            _state = value;
            AdjustOnOffButton();
        }
    }

    public SwitchButton()
    {
        InitializeComponent();
        State = SwitchState.Off;
    }

    private void AdjustOnOffButton()
    {
        switch (State)
        {
            case SwitchState.On:
                OnOffButton.Dock = DockStyle.Top;
                break;
            case SwitchState.Off:
                OnOffButton.Dock = DockStyle.Bottom;
                break;
            default:
                break;
        }
    }

    public void Toggle()
    {
        State = State == SwitchState.On? SwitchState.Off: SwitchState.On;
    }

    private void SwitchButton_SizeChanged(object sender, EventArgs e)
    {
        OnOffButton.Height = this.Height / 2;
    }

    private void OnOffButton_Click(object sender, EventArgs e)
    {
        Toggle();
    }
}

}

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