Row height and font

kay zar

January 18, 2012 11:22

Hello.

I would like to get Row height and font.
Now i'm using like this.

 

Font TempFont = new Font(l_crFontName, l_nFontSize); 
grid1.Headers[0].Appearance.RowFont = TempFont;
private void grid1_PaintRow(object sender, PaintRowEventArgs e) 
{ 
  e.Row.Height = (int)l_nFontSize + 6; 
} 

But Font and Row height are not good looking.
For larger Font Size ( font size = 22 ). The Text align is going to top, although i set to middle.

Thanks

0

• 

  Dapfor Team

  January 18, 2012 11:22

  Hello,
  
  Did you see the Row.Adjust() method?
  
  Regards,
  Dapfor

  0
• 

  Cory Rainbeau

  February 16, 2012 14:07

  Why doesn't the row height adjust automatically to fit the specified row font?

  0
• 

  Dapfor Team

  February 16, 2012 14:37

  This may not always be desirable. If the grid is constantly doing the adjustment and the programmer does not want to, he won’t able to keep the original size of rows.
  But it is easy to implement using the grid’s API:

   

  
  //Change the font:
  header.Appearance.RowFont = ...;
  
  //Adjust all visible rows
  for(int i = 0; i < grid.Rows.Count; ++i)
  {
      Row row = grid.Rows[i];
      row.Adjust();
  }
  
  //Adjust when a new row is added:
  grid.RowAdded += delegate(object sender, GridRowEventArgs e)
  {
      e.Row.Adjust();
  };

  Best regards,

  Dapfor

  
  
  

  0
• 

  Cory Rainbeau

  February 16, 2012 15:05

  I had originally done what you just suggested, but I also had to add the Adjust() call in the PaintRow event since the height went back to the original height when a row was updated.

  0
• 

  Dapfor Team

  February 16, 2012 15:26

  Adjusting rows in grid.Paint events can have a negative impact on the performance. Each time when the grid paints cells, it will measure the optimal size. At which moment do you change the font’s weight - when the row is updated or painted? And how much rows do you have in the grid?

  Regards,

  Dapfor

  0
• 

  Cory Rainbeau

  February 16, 2012 15:39

  I updated my code so that the Adjust() call is made in the RowUpdated event instead. Not sure why I didn't think of that before.

  Thanks.

  0
• 

  Dapfor Team

  February 16, 2012 15:47

  We think this will be more performant comparing to Grid.PaintRow event.

  Dapfor

  0
• 

  Cory Rainbeau

  February 16, 2012 17:54

  One final question. I'm using the grid to track stocks, which are updated many times per second. Is there anyway to set the row height just once, so that the Adjust() call doesn't have to be made on every single row update? The only time the row height needs to change is when the user changes the font for the rows.

  0
• 

  Dapfor Team

  February 17, 2012 09:22

  Hello,

  The response is in our previous post. When the user changes fonts call the following:

  OnFontChanged(object sender, EventArgs e)
  {
      //Adjust all visible rows
      for(int i = 0; i < grid.Rows.Count; ++i)
      {
          Row row = grid.Rows[i];
          row.Adjust();
      }
  }

  Just some notes about Grid.RowUpdated and Grid.PaintRow:

  May be you know that Windows paints the content in two steps:
  1.    It calls the method Control.Invalidate and cumulates a region
  2.    Then it sends a WM_PAINT message.
  I.e it has an asynchronous rendering system. The Control.Invalidate may be called by many times, but the WM_PAINT message will come to redraw the content only once. The minimum interval between two WM_PAINT messages is 15 msec. If the system is overloaded, then WM_PAINT comes less often.  Accordingly, the grid uses this feature for high-performance content displaying.
  
  When you call Row.Update/Cell.Update or grid receives notification from INotifyPropertyChanged/IBindingList it implicitly calls the Control.Invalidate() method. Grid.RowUpdated callback is called at this stage. The second callback Grid.PaintXXX()is called when a WM_PAINT message arrives and only for rows displayed in visible bounds of the grid.
  
  Therefore, stocks can be updated as often as needed, without an impact on the application performance.
  
  Hope, this will help you,

  Dapfor
  
  

  0
• 

  su myat

  December 31, 2012 04:29

  Hi,
  I want to change the font and font size of the grid header and hierarchical grid header
  I used the following code to change font and font size.
  
                  Font TempFont = new Font(l_crFontName, l_nFontSize);    
                  grid1.Headers[0].Appearance.RowFont = TempFont;
                  grid1.Headers[0].Appearance.ColumnCaptionFont = TempFont;
                  grid1.Headers[0].InvalidateRows();

  
                  grid1.Headers[1].Appearance.RowFont = TempFont;
                  grid1.Headers[1].Appearance.ColumnCaptionFont = TempFont;
                  grid1.Headers[1].InvalidateRows();
  
  Font size changing for headers [0] is ok. But headers[1] font size does not change as I want.
  Can you suggest me the correct way to change the font size for hierarchical header?
  Thanks in advance.
  
  Wish everyone happy and successful in upcoming years !
  Best Rgds

  0
• 

  Dapfor Team

  January 02, 2013 09:02

  Hello,

  Happy new year and best wishes in 2013!

  We didn't find any problem with font. Which version of the grid do you use and what behaviour do you expect?

  Best regards,

  Dapfor

   

   

  0

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