ActivityDesignerPaint.DrawExpandButton 方法

定義

命名空間:

System.Workflow.ComponentModel.Design

組件:

System.Workflow.ComponentModel.dll

在活動設計工具介面上繪製用來展開和摺疊複合設計工具的按鈕。

public:
 static void DrawExpandButton(System::Drawing::Graphics ^ graphics, System::Drawing::Rectangle boundingRect, bool drawExpanded, System::Workflow::ComponentModel::Design::CompositeDesignerTheme ^ compositeDesignerTheme);

public static void DrawExpandButton (System.Drawing.Graphics graphics, System.Drawing.Rectangle boundingRect, bool drawExpanded, System.Workflow.ComponentModel.Design.CompositeDesignerTheme compositeDesignerTheme);

static member DrawExpandButton : System.Drawing.Graphics * System.Drawing.Rectangle * bool * System.Workflow.ComponentModel.Design.CompositeDesignerTheme -> unit

Public Shared Sub DrawExpandButton (graphics As Graphics, boundingRect As Rectangle, drawExpanded As Boolean, compositeDesignerTheme As CompositeDesignerTheme)

參數

graphics

Graphics

要在其上繪製按鈕的 Graphics。

boundingRect

Rectangle

Rectangle ，定義按鈕界限。

drawExpanded

Boolean

true 表示繪製展開按鈕，否則為 false。

compositeDesignerTheme

CompositeDesignerTheme

與用來呈現按鈕的活動設計工具關聯的 CompositeDesignerTheme。

例外狀況

ArgumentNullException

graphics 或 compositeDesignerTheme 包含 null 參考 (在 Visual Basic 中為 Nothing)。

範例

下列範例將示範使用 ActivityDesignerPaint 類別在工作流程設計介面上繪製自訂活動。 先使用 DrawRoundedRectangle 方法來繪製圓角矩形。 然後，使用 DrawText 繪製文字，並放置在 TextRectangle 的 ActivityDesigner 位置。 此外，與 Image 相關聯的 ActivityDesigner 是使用 DrawImage 類別的 ActivityDesignerPaint 方法進行繪製的。 最後，CompositeActivity 所使用的展開按鈕是使用 DrawExpandButton 繪製的。

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