Question

我制作了一个可垂直滚动的面板，我想让它可以水平滚动。我的代码通过使用鼠标或使用鼠标滚轮拖动它来使面板可滚动。

这是我的代码：

private Point _mouseLastPosition;

    protected override void OnMouseDown(MouseEventArgs e)
    {
        if (e.Button == MouseButtons.Left)
        {
            _mouseLastPosition = e.Location;
        }
        base.OnMouseDown(e);
    }

    private int ValidateChange(int change)
    {
        var padding = -1;
        if (change < 0)
        {
            var max = (from Control control in Controls select control.Left + control.Width + padding).Concat(new[] { int.MinValue }).Max();

            if (max < Width + Math.Abs(change))
            {
                return Width - max;
            }
        }
        else
        {
            var min = (from Control control in Controls select control.Left).Concat(new[] { int.MaxValue }).Min();

            if (min > padding - Math.Abs(change))
            {
                return padding - min;
            }
        }
        return change;
    }

    private void HandleDelta(int delta)
    {
        var change = ValidateChange(delta);

        foreach (Control control in Controls)
        {
            control.Left += change;
        }

    }

    protected override void OnMouseMove(MouseEventArgs e)
    {
        if ((MouseButtons & MouseButtons.Left) != 0)
        {
            var delta = _mouseLastPosition.X - e.X;
            HandleDelta(delta);
            _mouseLastPosition = e.Location;
        }
        base.OnMouseMove(e);
    }

    protected override void OnMouseWheel(MouseEventArgs e)
    {
        HandleDelta(e.Delta);
        base.OnMouseWheel(e);
    }

我需要更改哪些内容才能使其按照我希望的方式运行？

更新：我按照你告诉我的方式更改了我的代码，但它并没有像我想要的那样工作。这就是它现在的样子（我想让它向右滚动）。

Answer 1

更改以下内容......

control.Top - ＆gt;＆gt; control.Left

control.Height-＆GT;＆GT; control.Width

高度 - ＆GT;＆GT; 宽度

var delta = e.Y - _mouseLastPosition.Y; - ＆GT;＆GT; var delta = _mouseLastPosition.X - e.X;

<强>更新

这不是最佳解决方案，但您可以尝试一下吗？

保持初始状态..

    private Dictionary<string, int> dicControls;

    private bool isOverFlow;

    protected override void InitLayout()
    {
        base.InitLayout();

        if (dicControls == null)
        {
            dicControls = new Dictionary<string, int>();

            foreach (Control control in Controls)
            {
                dicControls.Add(control.Name, control.Left);
            }

            var max = (from Control control in Controls select control.Left + control.Width + -1).Concat(new[] { int.MinValue }).Max();

            isOverFlow = (Width - max) < 0;
        }
    }

    private void HandleDelta(int delta)
    {
        var change = ValidateChange(delta);

        foreach (Control control in Controls)
        {
            var initalLeft = dicControls[control.Name];

            var tempLeft = control.Left + change;

            if(isOverFlow)
            {
                if (tempLeft > initalLeft || delta > 0)
                {
                    control.Left = initalLeft;
                }
                else
                {
                    control.Left += change;
                }
            }
            else
            {
                if (tempLeft < initalLeft)
                {
                    control.Left = initalLeft;
                }
                else
                {
                    control.Left += change;
                }
            }
        }
    }

通过鼠标拖动或使用鼠标滚轮可水平滚动面板

1 个答案: