ActivityDesignerPaint.DrawRoundedRectangle Método

Definição

Namespace:

System.Workflow.ComponentModel.Design

Assembly:

System.Workflow.ComponentModel.dll

Desenha um retângulo arredondado na superfície do designer de atividade.

public:
 static void DrawRoundedRectangle(System::Drawing::Graphics ^ graphics, System::Drawing::Pen ^ drawingPen, System::Drawing::Rectangle rectangle, int radius);

public static void DrawRoundedRectangle (System.Drawing.Graphics graphics, System.Drawing.Pen drawingPen, System.Drawing.Rectangle rectangle, int radius);

static member DrawRoundedRectangle : System.Drawing.Graphics * System.Drawing.Pen * System.Drawing.Rectangle * int -> unit

Public Shared Sub DrawRoundedRectangle (graphics As Graphics, drawingPen As Pen, rectangle As Rectangle, radius As Integer)

Parâmetros

graphics

Graphics

O Graphics no qual desenhar o retângulo.

drawingPen

Pen

O Pen para desenhar o retângulo.

rectangle

Rectangle

O Rectangle que define os limites do retângulo arredondado.

radius

Int32

O valor inteiro do raio a ser usado para bordas arredondadas.

Exceções

ArgumentNullException

graphics ou drawingPen contém uma referência nula (Nothing no Visual Basic).

Exemplos

O exemplo a seguir demonstra uma maneira de usar a ActivityDesignerPaint classe para desenhar uma atividade personalizada na superfície de design do fluxo de trabalho. Um retângulo arredondado é desenhado pela primeira vez usando o DrawRoundedRectangle método. Em seguida, o texto é desenhado usando DrawText e é colocado no local do TextRectangle ActivityDesigner. Além disso, o Image associado ao ActivityDesigner é desenhado usando o DrawImage método da ActivityDesignerPaint classe. Por fim, um botão expandir usado por um CompositeActivity é desenhado usando o 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

Comentários

DrawRoundedRectangle usa o GetRoundedRectanglePath método para obter o caminho a ser desenhado.