让listview增加编辑功能

c#的listview不是所有的列都有编辑功能，于是，到网上搜了一下发现一个印度人写的代码，比较简单，于是，下载下来，并修改简化了一下。

1：首先，是继承一个listview类，然后在这个类里添加文本框及以及列号行号

2：其次，建立一个矩形struct，利用windows消息获取单元格的矩形位置，

矩形struct代码：

internal struct rect { public int left; public int top; public int right; public int bottom; }

windows消息是LVM_GETSUBITEMRECT，接下来就可以写获取单元格位置的代码了：

internal class Win32 { public const int LVM_GETSUBITEMRECT = (0x1000) + 56; public const int LVIR_BOUNDS = 0; [DllImport("user32.dll", SetLastError = true)] public static extern int SendMessage(IntPtr hWnd, int messageID, int wParam, ref rect lParam); }

private rect getrect(Point po) { rect rect1 = new rect(); this.row = this.col = -1; ListViewItem lvi = this.GetItemAt(po.X ,po.Y ); if (lvi !=null){ for (int i = 0; i <= this.Columns .Count ;i++ ) { rect1.top = i + 1; rect1.left = Win32.LVIR_BOUNDS; try { int result = Win32.SendMessage(this.Handle ,Win32 .LVM_GETSUBITEMRECT ,lvi.Index ,ref rect1 ); if (result !=0){ if (po.X < rect1 .left ){ this.row = lvi.Index; this.col = 0; break; } if (po.X >=rect1 .left && po.X <=rect1.right ){ this.row = lvi .Index ; this.col = i+1; break; } } else { // This call will create a new Win32Exception with the last Win32 Error. throw new Win32Exception(); } }catch (Win32Exception ex){ } } } return rect1; }

 

 

 3：鼠标点取单元格，并在单元格内显示一个文本框：

protected override void OnMouseUp(MouseEventArgs e) { try { this.text.Visible = false; if (!mouseDown) return; if (!this.FullRowSelect || this.View != View.Details) { return; } mouseDown = false; rect rect2 = this.getrect(new Point (e.X,e.Y )); if (this.row !=-1 && this.col != -1){ Size sz = new Size(this.Columns[col].Width ,Items[row].Bounds .Height ); Point po1 = col==0?new Point(0,rect2 .top ):new Point (rect2 .left ,rect2 .top ); this.showtext(po1,sz ); } } catch (Exception ex){ } } private void showtext(Point location,Size sz){ text.Size = sz; text.Location = location; text.Text = this.Items[row].SubItems[col].Text; text.Show(); text.Focus(); }

 

所有可执行代码见我的下载。