ActivityDesignerPaint.DrawText Método

Definición

Espacio de nombres:

System.Workflow.ComponentModel.Design

Ensamblado:

System.Workflow.ComponentModel.dll

Dibuja el texto en la superficie del diseñador de actividad.

public:
 static void DrawText(System::Drawing::Graphics ^ graphics, System::Drawing::Font ^ font, System::String ^ text, System::Drawing::Rectangle boundingRect, System::Drawing::StringAlignment alignment, System::Workflow::ComponentModel::Design::TextQuality textQuality, System::Drawing::Brush ^ textBrush);

public static void DrawText (System.Drawing.Graphics graphics, System.Drawing.Font font, string text, System.Drawing.Rectangle boundingRect, System.Drawing.StringAlignment alignment, System.Workflow.ComponentModel.Design.TextQuality textQuality, System.Drawing.Brush textBrush);

static member DrawText : System.Drawing.Graphics * System.Drawing.Font * string * System.Drawing.Rectangle * System.Drawing.StringAlignment * System.Workflow.ComponentModel.Design.TextQuality * System.Drawing.Brush -> unit

Public Shared Sub DrawText (graphics As Graphics, font As Font, text As String, boundingRect As Rectangle, alignment As StringAlignment, textQuality As TextQuality, textBrush As Brush)

Parámetros

graphics

Graphics

Graphics donde se va a dibujar el texto.

font

Font

Objeto Font que se utiliza para dibujar el texto.

text

String

Texto que se va a trazar.

boundingRect

Rectangle

El Rectangle delimitador donde se debe dibujar el texto.

alignment

StringAlignment

StringAlignment que especifica dónde se alinea el texto en el rectángulo delimitador.

textQuality

TextQuality

TextQuality que especifica el valor de calidad para dibujar el texto.

textBrush

Brush

Brush para dibujar el texto.

Excepciones

ArgumentNullException

graphics, font, text, o textBrush contiene una referencia nula (Nothing en Visual Basic).

Ejemplos

El ejemplo siguiente muestra una manera de utilizar la clase ActivityDesignerPaint para dibujar una actividad personalizada en la superficie de diseño del flujo de trabajo. Un rectángulo redondeado se dibuja utilizando primero el método DrawRoundedRectangle. El texto se dibuja utilizando a continuación DrawText y se coloca en la ubicación de TextRectangle de ActivityDesigner. Además, el Image asociado a ActivityDesigner se dibuja utilizando el método DrawImage de la clase ActivityDesignerPaint. Finalmente, se dibuja un botón de expansión utilizado por CompositeActivity utilizando DrawExpandButton.

private bool expanded = true;
private bool useBasePaint = false;

public bool UseBasePaint
{
    get { return this.useBasePaint; }
    set { this.useBasePaint = value; }
}

public bool Expanded
{
    get { return this.expanded; }
    set { this.expanded = value; }
}

protected override void OnPaint(ActivityDesignerPaintEventArgs e)
{
    if (this.UseBasePaint == true)
    {
        base.OnPaint(e);
        return;
    }

    DrawCustomActivity(e);
}

private void DrawCustomActivity(ActivityDesignerPaintEventArgs e)
{
    Graphics graphics = e.Graphics;

    CompositeDesignerTheme compositeDesignerTheme = (CompositeDesignerTheme)e.DesignerTheme;

    ActivityDesignerPaint.DrawRoundedRectangle(graphics, compositeDesignerTheme.BorderPen, this.Bounds, compositeDesignerTheme.BorderWidth);

    string text = this.Text;
    Rectangle textRectangle = this.TextRectangle;
    if (!string.IsNullOrEmpty(text) && !textRectangle.IsEmpty)
    {
        ActivityDesignerPaint.DrawText(graphics, compositeDesignerTheme.Font, text, textRectangle, StringAlignment.Center, e.AmbientTheme.TextQuality, compositeDesignerTheme.ForegroundBrush);
    }

    System.Drawing.Image image = this.Image;
    Rectangle imageRectangle = this.ImageRectangle;
    if (image != null && !imageRectangle.IsEmpty)
    {
        ActivityDesignerPaint.DrawImage(graphics, image, imageRectangle, DesignerContentAlignment.Fill);
    }

    ActivityDesignerPaint.DrawExpandButton(graphics,
        new Rectangle(this.Location.X, this.Location.Y, 10, 10),
        this.Expanded,
        compositeDesignerTheme);
}

Private expandedValue As Boolean = True
Private useBasePaintValue As Boolean = False

Public Property UseBasePaint() As Boolean
    Get
        Return Me.useBasePaintValue
    End Get

    Set(ByVal value As Boolean)
        Me.useBasePaintValue = value
    End Set
End Property

Public Property Expanded() As Boolean
    Get
        Return Me.expandedValue
    End Get
    Set(ByVal value As Boolean)
        Me.expandedValue = value
    End Set
End Property


Protected Overrides Sub OnPaint(ByVal e As ActivityDesignerPaintEventArgs)
    If Me.UseBasePaint = True Then
        MyBase.OnPaint(e)
        Return
    End If

    DrawCustomActivity(e)
End Sub

Private Sub DrawCustomActivity(ByVal e As ActivityDesignerPaintEventArgs)
    Dim graphics As Graphics = e.Graphics

    Dim compositeDesignerTheme As CompositeDesignerTheme = CType(e.DesignerTheme, CompositeDesignerTheme)

    ActivityDesignerPaint.DrawRoundedRectangle(graphics, compositeDesignerTheme.BorderPen, Me.Bounds, compositeDesignerTheme.BorderWidth)

    Dim text As String = Me.Text
    Dim TextRectangle As Rectangle = Me.TextRectangle
    If Not String.IsNullOrEmpty(text) And Not TextRectangle.IsEmpty Then
        ActivityDesignerPaint.DrawText(graphics, compositeDesignerTheme.Font, text, TextRectangle, StringAlignment.Center, e.AmbientTheme.TextQuality, compositeDesignerTheme.ForegroundBrush)
    End If

    Dim Image As System.Drawing.Image = Me.Image
    Dim ImageRectangle As Rectangle = Me.ImageRectangle
    If Image IsNot Nothing And Not ImageRectangle.IsEmpty Then
        ActivityDesignerPaint.DrawImage(graphics, Image, ImageRectangle, DesignerContentAlignment.Fill)
    End If

    ActivityDesignerPaint.DrawExpandButton(graphics, _
        New Rectangle(Me.Location.X, Me.Location.Y, 10, 10), _
        Me.Expanded, _
        compositeDesignerTheme)
End Sub