请教如何设置COMBOBOX为只读，不可选择

[哥是龙王]

请教如何设置COMBOBOX为只读，不可选择，注意，不是要求不可输入的那种，是要求不可选择，因为我只要作为显示，就是类似Readonly那种设置一样的效果。谢谢。

[哥是龙王]

自己解决。
怎么就没看到ENABLE呢？

[CloneCenter]

恭喜楼主终于找到答案了。

[fuda_1985]

昏，刚想说enable呢。

[rqx110]

using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Drawing2D;
using System.Drawing;

public class ExComboBox : ComboBox
{
    private bool m_Unselectable = false;
    DblPanel pnl = new DblPanel();
    private const int WM_MOUSEWHEEL = 256;
    private const int WM_LBUTTONDOWN = 0x201;
    private const int WM_LBUTTONDBLCLK = 0x0203;
    private const int VK_SHIFT = 0x10;

    public ExComboBox()
    {
        pnl.Width = 17;
        pnl.Height = this.Height - 2;
        pnl.Left = this.Width - 18;
        pnl.Top = 1;
        this.Controls.Add(pnl);
        pnl.BringToFront();
        pnl.Visible = false;
    }

    protected override void OnKeyPress(KeyPressEventArgs e)
    {
        if (m_Unselectable == true)
            e.Handled = true;
        else
            base.OnKeyPress(e);
    }

    protected override void OnKeyDown(KeyEventArgs e)
    {
        if (m_Unselectable == true)
        {
            if ((int)e.KeyData == 131139)
                if (this.SelectedText != null)
                    Clipboard.SetText(this.SelectedText);
            e.Handled = true;
        }
        else
            base.OnKeyDown(e);
    }

    protected override void OnResize(EventArgs e)
    {
        base.OnResize(e);
        pnl.Left = this.Width - 18;
    }

    public bool ReadOnly
    {
        get
        {
            return m_Unselectable;
        }
        set
        {
            m_Unselectable = value;
            MakeUnselectable(m_Unselectable);
        }
    }

    private void MakeUnselectable(bool Unselectable)
    {
        if (m_Unselectable == true && this.DropDownStyle != ComboBoxStyle.Simple)
        {
            pnl.Visible = true;
        }
        else
        {
            pnl.Visible = false;
        }
    }

    protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
    {
        if (m_Unselectable == true)
        {
            if (this.DropDownStyle == ComboBoxStyle.DropDownList)
            {
                if (keyData != Keys.Tab)
                    return true;
            }
            else
            {
                if (keyData == Keys.Up || keyData == Keys.Down || keyData == Keys.PageUp || keyData == Keys.PageDown)
                    return true;
            }
        }
        return base.ProcessCmdKey(ref msg, keyData);
    }

    protected override void OnMouseDown(MouseEventArgs e)
    {
        base.OnMouseDown(e);
    }

    protected override void WndProc(ref Message m)
    {
        if (this.m_Unselectable == true)
        {
            if (m.Msg == WM_MOUSEWHEEL || m.Msg == WM_LBUTTONDBLCLK)
                return;
            if (m.Msg == WM_LBUTTONDOWN)
            {
                this.Focus();
                return;
            }
        }

        base.WndProc(ref m);
    }

    protected override void OnDropDownStyleChanged(EventArgs e)
    {
        if (this.DropDownStyle == ComboBoxStyle.Simple)
            pnl.Visible = false;
        else
            if (m_Unselectable == true)
                pnl.Visible = true;
            else
                pnl.Visible = false;

        base.OnDropDownStyleChanged(e);
    }

    protected class DblPanel : Panel
    {
        protected override void OnPaint(PaintEventArgs e)
        {
            if (this.Visible == true)
            {
                ComboBoxRenderer.DrawDropDownButton(e.Graphics, e.ClipRectangle, System.Windows.Forms.VisualStyles.ComboBoxState.Disabled);
            }
        }
    }

}

[outou]

解决了就好。

[哥是龙王]

问题又来了，解决了一并结贴

我把各个控件放到GROUPBOX容器中，再把groupbox容器Enable属性设为假，这样可以一次性把控件设置为只读，这时候信息内容都是暗灰色的，现在我想修改这个颜色为黑色，该在哪里处理呢？谢谢

[pjagz]

Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged
ComboBox1.SelectedIndex = -1

End Sub

[yanlongwuhui]

重载EnabledChanged

[哥是龙王]

如何重载EnabledChanged？有代码吗？谢谢

[rqx110]

[Quote=引用 6 楼 fujiandragon 的回复:]
问题又来了，解决了一并结贴

我把各个控件放到GROUPBOX容器中，再把groupbox容器Enable属性设为假，这样可以一次性把控件设置为只读，这时候信息内容都是暗灰色的，现在我想修改这个颜色为黑色，该在哪里处理呢？谢谢

[/Quote]

ForeColor=Color.Black

[yanlongwuhui]

[Quote=引用 9 楼 fujiandragon 的回复:]
如何重载EnabledChanged？有代码吗？谢谢
[/Quote]
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