MOUSE POSITION

Hredmond

January 05, 2014 11:02

I am trying to get the exact position of the mouse when it enters a cell. I know I get the cell.virtual bounds but this does not always seem to equate to the top left hand corner of the cell which I thought it would. What I am trying to do is show a windows LABEL at the top right of the cell that I just entered – how can I do that?

Also I want to display a similar label when the mouse enters a column header but there are no events that seem to be fired to capture when the mouse is over the column header – can this be done?

Thanks

 

0

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  Dapfor Team

  January 05, 2014 11:13

  Dear Hamish,

  The best way to do it - is to draw labels in Grid.PaintCell & Grid.PaintColumnCaption routines. You should also invalidate cells when you enter/leave them. Please find an example demonstrating the wanted behavior:

   

  public partial class DapforDemo : Form
  {
      readonly Font _font = new Font("Arial", 6, FontStyle.Italic|FontStyle.Bold);
  
      public DapforDemo()
      {
          InitializeComponent();
  
          //Populate the grid here...
  
          //Invalidate cells when the mouse enters or leaves them
          grid.CellEnter += delegate(object sender, GridCellEventArgs e) { e.Cell.Invalidate(); };
          grid.CellLeave += delegate(object sender, GridCellEventArgs e) { e.Cell.Invalidate(); };
  
          //Cell painting routine
          grid.PaintCell += delegate(object sender, PaintCellEventArgs e)
          {
              //Do default painting
              e.PaintAll();
              e.Handled = true;
  
              //Draw a custom label in the top-right corner of cell
              if (e.Cell.Column != null && e.Cell.VirtualBounds.Contains(grid.PointToClient(MousePosition)))
              {
                  string label = string.Format("cell {0},{1}",e.Cell.Row.VisibleIndex,e.Cell.Column.VisibleIndex);
                  using(StringFormat sf = new StringFormat())
                  {
                      sf.Alignment = StringAlignment.Far;
                      sf.LineAlignment = StringAlignment.Near;
                      e.Graphics.DrawString(label, _font, Brushes.Red, e.Cell.VirtualBounds, sf);
                  }
              }
          };
  
          //Column painting routine
          grid.PaintColumnCaption += delegate(object sender, PaintColumnCaptionEventArgs e)
          {
              //Do default painting
              e.PaintAll();
              e.Handled = true;
  
              //Draw a custom label 
              if (e.Column != null && e.VirtualBounds.Contains(grid.PointToClient(MousePosition)))
              {
                  string label = string.Format("column {0}", e.Column.VisibleIndex);
                  using (StringFormat sf = new StringFormat())
                  {
                      sf.Alignment = StringAlignment.Far;
                      sf.LineAlignment = StringAlignment.Near;
                      e.Graphics.DrawString(label, _font, Brushes.Red, e.VirtualBounds, sf);
                  }
              }
          };
      }
  }

   

  Best regards,

  Dapfor

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