检查用户在tablelayoutpanel中单击的单元格中是否存在控件

Question

How can I check that the control exists on that cell where the user has clicked? Is there any kind of function of the tablelayoutpanel? I just want to check that if the clicked cell HasControl then delete that control in that specific cell.

Answer 1

There isn't a built in function for this, so you would have to find the cell position yourself:

void tlp_MouseDown(object sender, MouseEventArgs e) {
  if (e.Button == MouseButtons.Left) {
    int[] colWidths = tlp.GetColumnWidths();
    int[] rowHeights = tlp.GetRowHeights();
    int top = tlp.Parent.PointToScreen(tlp.Location).Y;
    for (int y = 0; y < rowHeights.Length; ++y) {
      int left = tlp.Parent.PointToScreen(tlp.Location).X;
      for (int x = 0; x < colWidths.Length; ++x) {
        if (new Rectangle(left, top, colWidths[x], rowHeights[y])
                          .Contains(MousePosition)) {
          Control c = tlp.GetControlFromPosition(x, y);
          if (c != null) {
            c.Dispose();
          }
        }
        left += colWidths[x];
      }
      top += rowHeights[y];
    }
  }
}

Do note that the functions GetColumnWidths() and GetRowHeights() are not visible from intellisense. Also, if the user clicks on the control itself, this code won't fire. You would have to handle the MouseDown event of the control in that cell.