DataGridTextBoxColumn.GetPreferredSize(Graphics, Object) Metodo

  • Riferimento

Definizione

Spazio dei nomi:
System.Windows.Forms
Assembly:
System.Windows.Forms.dll

Restituisce la larghezza e l'altezza ottimali della cella in una riga specificata in relazione al valore specificato.

protected public:
 override System::Drawing::Size GetPreferredSize(System::Drawing::Graphics ^ g, System::Object ^ value);
protected internal override System.Drawing.Size GetPreferredSize (System.Drawing.Graphics g, object value);
override this.GetPreferredSize : System.Drawing.Graphics * obj -> System.Drawing.Size
Protected Friend Overrides Function GetPreferredSize (g As Graphics, value As Object) As Size

Parametri

g
Graphics

Oggetto Graphics utilizzato per disegnare forme sullo schermo.

value
Object

Valore da disegnare.

Restituisce

Size

Oggetto Size che contiene le dimensioni della cella.

Esempio

Nell'esempio seguente viene GetPreferredSize usato per restituire un Sizeoggetto .

public ref class MyGridColumn: public DataGridTextBoxColumn
{
public:
   Size GetPrefSize( Graphics^ g, String^ val )
   {
      return this->GetPreferredSize( g, val );
   }

};

public ref class Form1: public Form
{
protected:
   DataGrid^ dataGrid1;

private:
   void GetPreferredSize()
   {
      Graphics^ g;
      g = this->CreateGraphics();
      System::Drawing::Size gridPreferredSize;
      MyGridColumn^ myTextColumn;
      
      // Assuming column 1 of a DataGrid control is a 
      // DataGridTextBoxColumn.
      myTextColumn = dynamic_cast<MyGridColumn^>(dataGrid1->TableStyles[ 0 ]->GridColumnStyles[ 1 ]);
      String^ myVal;
      myVal = "A long string value";
      gridPreferredSize = myTextColumn->GetPrefSize( g, myVal );
      Console::WriteLine( gridPreferredSize );
   }

};

public class Form1: Form
{
 protected DataGrid dataGrid1;

private void GetPreferredSize(){
   Graphics g;
   g = this.CreateGraphics();
   Size gridPreferredSize;
   MyGridColumn myTextColumn;
    // Assuming column 1 of a DataGrid control is a 
    // DataGridTextBoxColumn.
   myTextColumn = (MyGridColumn)
   dataGrid1.TableStyles[0].GridColumnStyles[1];
   string myVal;
   myVal = "A long string value";
   gridPreferredSize = myTextColumn.GetPrefSize(g, myVal);
   Console.WriteLine(gridPreferredSize);
   }
}

public class MyGridColumn:DataGridTextBoxColumn{
   public Size GetPrefSize(Graphics g, string val){
      return this.GetPreferredSize(g, val);
   }
}

Public Class Form1
    Inherits Form
    Protected dataGrid1 As DataGrid
    
    Private Sub GetPreferredSize()
        Dim g As Graphics
        g = Me.CreateGraphics()
        Dim gridPreferredSize As Size
        Dim myTextColumn As MyGridColumn
        ' Assuming column 1 of a DataGrid control is a 
        ' DataGridTextBoxColumn.
        myTextColumn = CType(dataGrid1.TableStyles(0). _
        GridColumnStyles(1), MyGridColumn)
        Dim myVal As String
        myVal = "A long string value"
        gridPreferredSize = myTextColumn.GetPrefSize _
        (g, myVal)
        Console.WriteLine(gridPreferredSize)
    End Sub 
End Class 

Public Class MyGridColumn
Inherits DataGridTextBoxColumn
   public Function GetPrefSize(g As Graphics , val As string) _
   As Size
      return me.GetPreferredSize(g, val)
   End Function
End Class

Commenti

La larghezza e l'altezza ottimali vengono calcolate misurando le dimensioni della stringa, tenendo conto del carattere e degli attributi e aggiungendo valori di margine.

Si applica a

Vedi anche