我有一个WinForm DataGridView
,我的目标是拖动一列,将其放到其他列索引。 我知道重新排序列,可以通过使用AllowUserToOrderColumns = true
。 但我要对DGV执行其他操作。 这就是为什么我需要在鼠标向上事件的目标列的索引。 要做到这一点,我用HitTestInfo
:
System.Windows.Forms.DataGrid.HitTestInfo myHitTest;
myHitTest = dataGrid1.HitTest(e.X, e.Y);
int p = myHitTest.ColumnIndex;
当我点击第一列DGV,运行此代码,给我列的索引( p
)。 问题是,当我把它放在DGV的另一列,我想知道目标列的索引,使用相同的代码p = -1
,我想是因为HitTestInfo
构件上的返回值MouseDown
而不是一个MouseUp
。 如果有人能告诉我如何做到这一点,那将是非常巨大的。
您可以创建两个HitTestInfo对象,一个在MouseDown
,一个在MouseUp
。
海事组织,你也应该使用DataGridView.HitTestInfo
类,而不是DataGrid.HitTestInfo
并尽量不叫或名称DataGridViews
DataGrids
,这是从类似,但不同的控制WPF
!
DataGridView.HitTestInfo myHitTestDown, myHitTestUp;
int visibleColumnDown, visibleColumnUp;
private void dataGrid1_MouseUp(object sender, MouseEventArgs e)
{
myHitTestUp = dataGrid1.HitTest(e.X, e.Y);
visibleColumnUp = getVisibleColumn(dataGrid1, e.X);
}
private void dataGrid1_MouseDown(object sender, MouseEventArgs e)
{
myHitTestDown = dataGrid1.HitTest(e.X, e.Y);
visibleColumnDown = getVisibleColumn(dataGrid1, e.X);
}
更新:要查找后列已重新排序,只需使用一列的可见指数:
dataGrid1.Columns[myHitTestUp.ColumnIndex].DisplayIndex;
之前,我发现,我写了这个小帮手功能,这不相同:
int getVisibleColumn(DataGridView dgv, int x)
{
int cx = dgv.RowHeadersWidth;
int c = 0;
foreach (DataGridViewColumn col in dgv.Columns)
{
cx += col.Width; if ( cx >= x) return c; c++;
}
return -1;
}
要找出哪一列是被洗牌似乎有点困难。 有一个事件,它被调用为每个 受到影响 ,它总是最先被称为该被拖着的一列。 下面是做这件事:
建立在类级别的变量:
List<DataGridViewColumn> shuffled = new List<DataGridViewColumn>();
DataGridViewColumn shuffledColumn = null;
还记得第一列:
private void dgvLoadTable_ColumnDisplayIndexChanged(
object sender, DataGridViewColumnEventArgs e)
{
if (shuffledColumn == null) shuffledColumn = e.Column;
}
忘记之前发生了什么:
private void dgvLoadTable_MouseDown(object sender, MouseEventArgs e)
{
shuffledColumn = null;
}
现在你可以使用它。 选择列,然而,不与他们洗牌顺利! 如果你这样做
shuffledColumn.Selected = true;
如果它只会被选中SelectionMode
或者是FullColumnSelect
或ColumnHeaderSelect
-在这两种模式下,洗牌是行不通的,我怕..
您可以使用拖放了点。
假设你有一个Form
用DataGridView
名为dataGridView1
。
最初,不要忘了让拖放为DataGridView
:
dataGridView1.AllowDrop = true;
事件处理程序将取代所需功能MouseUp
将是dataGridView1_DragDrop
,目标列的索引是colIndexOfItemUnderMouseToDrop
:
private Rectangle dragBoxFromMouseDown;
private int colIndexFromMouseDown;
private void dataGridView1_MouseMove(object sender, MouseEventArgs e)
{
if ((e.Button & MouseButtons.Left) == MouseButtons.Left)
{
// If the mouse moves outside the rectangle, start the drag.
if (dragBoxFromMouseDown != Rectangle.Empty &&
!dragBoxFromMouseDown.Contains(e.X, e.Y))
{
// Proceed with the drag and drop, passing in the list item.
dataGridView1.DoDragDrop(colIndexFromMouseDown, DragDropEffects.Move);
}
}
}
private void dataGridView1_MouseDown(object sender, MouseEventArgs e)
{
// Get the index of the item the mouse is below.
colIndexFromMouseDown = dataGridView1.HitTest(e.X, e.Y).ColumnIndex;
if (colIndexFromMouseDown != -1)
{
// Remember the point where the mouse down occurred.
// The DragSize indicates the size that the mouse can move
// before a drag event should be started.
Size dragSize = SystemInformation.DragSize;
// Create a rectangle using the DragSize, with the mouse position being
// at the center of the rectangle.
dragBoxFromMouseDown = new Rectangle(
new Point(e.X - (dragSize.Width / 2), e.Y - (dragSize.Height / 2)),
dragSize);
}
else
// Reset the rectangle if the mouse is not over an item in the ListBox.
dragBoxFromMouseDown = Rectangle.Empty;
}
private void dataGridView1_DragOver(object sender, DragEventArgs e)
{
e.Effect = DragDropEffects.Move;
}
private void dataGridView1_DragDrop(object sender, DragEventArgs e)
{
// If the drag operation was a move then remove and insert the column.
if (e.Effect == DragDropEffects.Move)
{
// The mouse locations are relative to the screen, so they must be
// converted to client coordinates.
Point clientPoint = dataGridView1.PointToClient(new Point(e.X, e.Y));
// Get the column index of the item the mouse is below.
int colIndexOfItemUnderMouseToDrop = dataGridView1.HitTest(clientPoint.X, clientPoint.Y).ColumnIndex;
if (colIndexOfItemUnderMouseToDrop == -1)
return;
colIndexOfItemUnderMouseToDrop = dataGridView1.Columns[colIndexOfItemUnderMouseToDrop].DisplayIndex;
// Now we have the column's display index.
if (e.Data.GetDataPresent(typeof(int)))
{
int colToMove = (int)e.Data.GetData(typeof(int));
dataGridView1.Columns[colToMove].DisplayIndex = colIndexOfItemUnderMouseToDrop;
// Select the column:
dataGridView1.Columns[colToMove].Selected = true;
}
}
}
编辑
新的方法:
private DataGridViewColumn columnToMove;
public Form1()
{
InitializeComponent();
dataGridView1.Columns.AddRange(new DataGridViewColumn[]
{
new DataGridViewTextBoxColumn { Name = "AAA", SortMode = DataGridViewColumnSortMode.NotSortable },
new DataGridViewTextBoxColumn { Name = "BBB", SortMode = DataGridViewColumnSortMode.NotSortable },
new DataGridViewTextBoxColumn { Name = "CCC", SortMode = DataGridViewColumnSortMode.NotSortable }
});
dataGridView1.Rows.Add(2);
dataGridView1.AllowUserToOrderColumns = true;
dataGridView1.MouseDown += dataGridView1_MouseDown;
dataGridView1.ColumnDisplayIndexChanged += dataGridView1_ColumnDisplayIndexChanged;
}
private void dataGridView1_ColumnDisplayIndexChanged(object sender, DataGridViewColumnEventArgs e)
{
if (e.Column == columnToMove)
{
dataGridView1.SelectionMode = DataGridViewSelectionMode.ColumnHeaderSelect;
e.Column.Selected = true;
}
}
private void dataGridView1_MouseDown(object sender, MouseEventArgs e)
{
var hti = dataGridView1.HitTest(e.X, e.Y);
if (hti.Type == DataGridViewHitTestType.ColumnHeader)
{
columnToMove = dataGridView1.Columns[hti.ColumnIndex];
dataGridView1.SelectionMode = DataGridViewSelectionMode.RowHeaderSelect;
}
}
文章来源: How to get a DataGridView column's index in a MouseUp event, not in a MouseDown event?