Question

我有多个自定义控件（它是一个带有标签的按钮）添加到FLP中。我试图通过拖动另一个来重新排列添加的自定义控件。有一些帮助使它使用简单的按钮，但不使用自定义控件.. 另一个问题，如果我使用简单的按钮，只有FLP在表单上，但如果我将FLP放在tabControl中的tabPage中，则不再有效。为什么不使用自定义控件以及何时FLP位于tabControl中？

这是我到目前为止所尝试的：

public partial class test_frm : Form
{

   FlowLayoutPanel flowLayoutPanel1 = new FlowLayoutPanel();
    private List<Control> _items = new List<Control>();

    public test_frm()
    {
        InitializeComponent();
        flowLayoutPanel1.AllowDrop = true;
        tabControl1.AllowDrop = true;
        flowLayoutPanel1.Dock = DockStyle.Fill;
        this.Controls.Add(flowLayoutPanel1);
        tabPage1.Controls.Add(flowLayoutPanel1);
        flowLayoutPanel1.DragEnter += new DragEventHandler(flowLayoutPanel1_DragEnter);
        flowLayoutPanel1.DragDrop += new DragEventHandler(flowLayoutPanel1_DragDrop);

        //add custom controls
        for (int i = 0; i < 10; i++)
        {
            Button button = new Button();
            Label lbl = new Label();
            CustomControl cst = new CustomControl(button, lbl);

            button.Text = "Button " + i.ToString();
            lbl.Text = "lbl " + i.ToString();
            cst.Name = "Button " + i.ToString();
            this._items.Add(cst);
            flowLayoutPanel1.Controls.Add(cst);
            cst.MouseDown += new MouseEventHandler(button_MouseDown);
        }
    }


    void flowLayoutPanel1_DragDrop(object sender, DragEventArgs e)
    {

        List<Control> controls = new List<Control>(flowLayoutPanel1.Controls.Count); // get a copy of the controls on the FLP

        foreach (Control ctr in flowLayoutPanel1.Controls)
        {
            controls.Add(ctr);
        }

        for (int i = 0; i < controls.Count; i++)
        {
            Point mouse = PointToClient(new Point(e.X, e.Y));
            if (controls[i].Bounds.Contains(mouse.X - flowLayoutPanel1.Left, mouse.Y - flowLayoutPanel1.Top))
            //If the control is dragged to another control inside the FlowLayoutPanel, move the dragged control to that place.
            {
                string name = (string)e.Data.GetData(typeof(string));
                Control drag = flowLayoutPanel1.Controls.Find(name, true)[0];
                Control temp = controls[i];
                controls.RemoveAt(getIndex(drag.Name));
                controls.Insert(i, drag);

                flowLayoutPanel1.Controls.Clear(); //Clear the controls
                for (int j = 0; j < controls.Count; j++)
                {
                    flowLayoutPanel1.Controls.Add(controls[j]); //Readd all the Controls in new order
                }
                break;
            }

        }
    }

    private int getIndex(string name)
    {
        int result = -1;
        for (int i = 0; i < flowLayoutPanel1.Controls.Count; i++)
        {
            if (flowLayoutPanel1.Controls[i].Name == name)
            {
                result = i;
                break;
            }
        }
        return result;
    }

    void flowLayoutPanel1_DragEnter(object sender, DragEventArgs e)
    {
        e.Effect = DragDropEffects.Copy;
    }


    void button_MouseDown(object sender, MouseEventArgs e)
    {
        (sender as CustomControl).DoDragDrop((sender as CustomControl).Name, DragDropEffects.Copy);

    }
}


public class CustomControl : Control
{
    private Button _button;
    private Label _label;


    public CustomControl(Button button, Label label)
    {
        _button = button;
        _label = label;
        button.Width = 64;
        button.Height = 65;
        button.AutoSize = true;
        label.Width = 65;
        button.FlatStyle = FlatStyle.Flat;
        button.AllowDrop = true;
        //button.Margin = new Padding(15, 15, 15, 15);
        button.BackgroundImageLayout = ImageLayout.Stretch;
        Height = button.Height + label.Height;
        Width = 68;

       // Width = Math.Max(button.Width, label.Width);
        Controls.Add(_button);
        _button.Location = new Point(0, 0);
        Controls.Add(_label);
        _label.Location = new Point(0, button.Height);

    }

Answer 1

工作解决方案：

private void flowLayoutPanel1_DragDrop(object sender, DragEventArgs e)
{
    Control target = new Control();

    target.Parent = sender as Control;

        if (target != null)
        {
            int targetIndex = FindCSTIndex(target.Parent);
            if (targetIndex != -1)
            {
                string cst_ctrl = typeof(CustomControl).FullName;
                if (e.Data.GetDataPresent(cst_ctrl))

                {
                    Button source = new Button();
                    source.Parent = e.Data.GetData(cst_ctrl) as CustomControl;

                    if (targetIndex != -1)
                        this.flowLayoutPanel1.Controls.SetChildIndex(source.Parent, targetIndex);
                }
            }
        }
    }

private int FindCSTIndex(Control cst_ctr)
{
    for (int i = 0; i < this.flowLayoutPanel1.Controls.Count; i++)
    {    
        CustomControl target = this.flowLayoutPanel1.Controls[i] as CustomControl;

        if (cst_ctr.Parent == target)
            return i;
    }
    return -1;
}

private void OnCstMouseMove(object sender, MouseEventArgs e)
{
    if (e.Button == MouseButtons.Left)
    {
        Control cst = sender as Control;
        cst.DoDragDrop(cst.Parent, DragDropEffects.Move);
    }
}

在flowLayoutPanel中重新排列CustomControl

1 个答案: