ActivityDesignerPaint.DrawText(Graphics, Font, String, Rectangle, StringAlignment, TextQuality, Brush) 方法
定义
在活动设计器图面上绘制文本。Draws text on the activity designer surface.
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)
参数
- text
- String
要绘制的文本。The text to draw.
- boundingRect
- Rectangle
必须在其中绘制文本的边界 Rectangle。The bounding Rectangle in which the text must be drawn.
- alignment
- StringAlignment
指定文本在边框中的对齐位置的 StringAlignment。The StringAlignment that specifies where the text is aligned in the bounding rectangle.
- textQuality
- TextQuality
指定绘制文本时所要使用的质量设置的 TextQuality。The TextQuality that specifies the quality setting to draw the text.
例外
graphics、font、text 或 textBrush 包含空引用(在 Visual Basic 中为 Nothing)。graphics, font, text, or textBrush contains a null reference (Nothing in Visual Basic).
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。The following example demonstrates a way to use the ActivityDesignerPaint class to draw a custom activity on the workflow design surface. 首先使用 DrawRoundedRectangle 方法绘制一个圆角矩形。A rounded rectangle is first drawn using the DrawRoundedRectangle method. 然后使用 DrawText 绘制文本并将其放在 TextRectangle 的 ActivityDesigner 位置。Text is then drawn using DrawText and is placed at the location of the TextRectangle of the ActivityDesigner. 此外,再使用 Image 类的 ActivityDesigner 方法绘制与 DrawImage 关联的 ActivityDesignerPaint。Additionally, the Image associated with the ActivityDesigner is drawn using the DrawImage method of the ActivityDesignerPaint class. 最后,使用 CompositeActivity 绘制由 DrawExpandButton 使用的展开按钮。Finally, an expand button used by a CompositeActivity is drawn using the 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