我有DataGridView dgv
。在 dgv 的一个单元格中,我有一个带有数字的灰色阴影单元格(其余单元格为空白和白色)。我希望能够将该阴影单元格正确并拖动到该列中的另一个单元格,并从前一个单元格的位置、值、行#、列#等以及新单元格的位置、值、行/列中获取信息。这可能吗?这与棋盘非常相似,其中“棋子”通过拖动从一个单元格移动到另一个单元格。
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1 回答
5
下面的代码可以工作,尽管几乎可以肯定可以稍微整理一下。它基于DataGridViewFAQ中的示例。在那个例子中,他们拖动行,所以我稍微改变了一些东西来移动单元格值并使用鼠标右键。
我没有开始工作的一件事(尽管我没有花很长时间)是使用DoDragDrop
参数传递拖动的单元格。该对象是通过 null 来的,所以我只是将它放在表单级变量中。
private DataGridViewCell drag_cell;
private Rectangle dragBoxFromMouseDown;
public Form1()
{
InitializeComponent();
dataGridView1.AllowDrop = true;
dataGridView1.MouseDown += new MouseEventHandler(dataGridView1_MouseDown);
dataGridView1.MouseMove += new MouseEventHandler(dataGridView1_MouseMove);
dataGridView1.DragOver += new DragEventHandler(dataGridView1_DragOver);
dataGridView1.DragDrop += new DragEventHandler(dataGridView1_DragDrop);
}
private void dataGridView1_MouseMove(object sender, MouseEventArgs e)
{
if ((e.Button & MouseButtons.Right) == MouseButtons.Right)
{
// 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.
DragDropEffects dropEffect = dataGridView1.DoDragDrop(
dataGridView1.Rows[rowIndexFromMouseDown],
DragDropEffects.Move);
}
}
}
private void dataGridView1_DragOver(object sender, DragEventArgs e)
{
e.Effect = DragDropEffects.Move;
}
private void dataGridView1_DragDrop(object sender, DragEventArgs e)
{
// 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 row index of the item the mouse is below.
DataGridView.HitTestInfo hti = dataGridView1.HitTest(clientPoint.X, clientPoint.Y);
DataGridViewCell targetCell = dataGridView1[hti.ColumnIndex, hti.RowIndex];
// If the drag operation was a move then remove and insert the row.
if (e.Effect == DragDropEffects.Move)
{
targetCell.Value = drag_cell.Value;
dataGridView1.Refresh();
}
}
void dataGridView1_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == System.Windows.Forms.MouseButtons.Right)
{
DataGridView.HitTestInfo hti = dataGridView1.HitTest(e.X, e.Y);
drag_cell = dataGridView1[hti.ColumnIndex, hti.RowIndex];
// Proceed with the drag and drop, passing in the list item.
DragDropEffects dropEffect = dataGridView1.DoDragDrop(
drag_cell,
DragDropEffects.Move);
}
}
于 2012-07-16T18:40:04.640 回答