ActivityDesignerPaint.DrawRoundedRectangle 方法

定义

命名空间:

System.Workflow.ComponentModel.Design

程序集:

System.Workflow.ComponentModel.dll

在活动设计器图面上绘制圆角矩形。

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)

参数

graphics

Graphics

要在其上绘制矩形的 Graphics。

drawingPen

Pen

用于绘制矩形的 Pen。

rectangle

Rectangle

定义圆角矩形边界的 Rectangle。

radius

Int32

要用于圆角边缘的半径的整数值。

例外

ArgumentNullException

graphics 或 drawingPen 包含空引用（在 Visual Basic 中为 Nothing）。

示例

下面的示例演示一种使用 ActivityDesignerPaint 类在工作流设计图面上绘制自定义活动的方式。 首先使用 DrawRoundedRectangle 方法绘制一个圆角矩形。 然后使用 DrawText 绘制文本并将其放在 TextRectangle 的 ActivityDesigner 位置。 此外，再使用 Image 类的 ActivityDesigner 方法绘制与 DrawImage 关联的 ActivityDesignerPaint。 最后，使用 CompositeActivity 绘制由 DrawExpandButton 使用的展开按钮。

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

注解

DrawRoundedRectangle 使用 GetRoundedRectanglePath 方法获取要绘制的路径。