向ListView添加半透明按钮

Question

我有listview控件。我需要将带图像的半透明按钮添加到listview。像这样：

我发现several projects使用表单上的半透明按钮。但是当我将它们传输到ListView时，它们不起作用。

必须使用.net 2.0框架。

Answer 1

我找到了一些解决方案。

Making Transparent Controls - No Flickering

我从TranspControl类继承了TransparentToggleButton类：

public class TransparentToggleButton : TranspControl
{
    private Image _normalState;
    private Image _mouseUpState;
    private Image _activateState;
    private bool _state;
    private bool _mouseUnder;
    public event EventHandler StateChanged;

    public bool ToggleState
    {
        get { return _state; }
        set
        {
            _state = value;
            SetImage();
        }
    }

    public void SetImages(Image normalState, Image mouseUpState, Image activateState)
    {
        BackImage = normalState;
        _normalState = normalState;
        _mouseUpState = mouseUpState;
        _activateState = activateState;
    }

    protected override void OnMouseClick(MouseEventArgs e)
    {
        base.OnMouseClick(e);
        if (e.Button == MouseButtons.Left)
        {
            _state = !_state;
            if (StateChanged != null)
                StateChanged(this, e);
            SetImage();
        }
    }

    protected override void OnMouseEnter(EventArgs e)
    {
        base.OnMouseEnter(e);
        _mouseUnder = true;
        SetImage();
    }

    protected override void OnMouseLeave(EventArgs e)
    {
        base.OnMouseLeave(e);
        _mouseUnder = false;
        SetImage();
    }

    private void SetImage()
    {
        try
        {
            if (_state)
                BackImage = _activateState;
            else
                BackImage = _mouseUnder ? _mouseUpState : _normalState;
        }
        catch (Exception)
        {

        }
    }
}

功能SetImages加载用于正常状态的3个图像，当光标在按钮上时正常状态，激活状态。

除了需要catch listview scroll event和Invalidate（）TransparentToggleButton。