【发布时间】:2015-01-27 18:05:00
【问题描述】:
我正在尝试在 WinForms 按钮控件中覆盖 OnPaint。我想将图像和文本对齐在中心,彼此相邻。据我所知,使用默认控件无法做到这一点。这个想法是继承自Button,并且仅“覆盖”图像+文本部分的绘制。我有一个几乎可以工作的版本,但如果我在我的 ImgButton 和 Button 上设置“Segoe UI Semibold; 9pt; style=Bold”,ImgButtons 文本会更加“粗体”。这是我的课:
Imports System.Windows.Forms
Imports System.Drawing
Public Class ImgButton
Inherits Button
Public Sub New()
MyBase.New()
End Sub
Private _text As String = "Text"
Private _img As Bitmap = Nothing
Private isOwnerPainting As Boolean = True
Overrides Property Text As String
Get
If isOwnerPainting = True Then
Return _text
Else
Return ""
End If
End Get
Set(value As String)
_text = value
End Set
End Property
Property CenteredImage As Bitmap
Get
If isOwnerPainting = True Then
Return _img
Else
Return Nothing
End If
End Get
Set(value As Bitmap)
_img = value
End Set
End Property
Private _font As Font = MyBase.Font
Overrides Property Font As Font
Get
Return _font
End Get
Set(value As Font)
_font = value
End Set
End Property
Protected Overrides Sub OnPaint(ByVal pe As PaintEventArgs)
isOwnerPainting = True
If Me.CenteredImage IsNot Nothing Then
isOwnerPainting = False
MyBase.OnPaint(pe)
isOwnerPainting = True
Dim textWidth As Integer = pe.Graphics.MeasureString(Me.Text, Me.Font).Width
Dim textHeight As Integer = pe.Graphics.MeasureString(Me.Text, Me.Font).Height
Dim imgPlusTextWidth As Integer = Me.CenteredImage.Width + textWidth
Dim imgPlusTextHeight As Integer = Me.CenteredImage.Height + textHeight
Dim imageLeft As Integer = (Me.Width / 2) - (imgPlusTextWidth / 2)
pe.Graphics.DrawImage(Me.CenteredImage, New Point(imageLeft, (Me.Height / 2) - (Me.CenteredImage.Height / 2)))
pe.Graphics.DrawString(Me.Text, Me.Font, New SolidBrush(MyBase.ForeColor), New Point(imageLeft + 5 + Me.CenteredImage.Width, (Me.Height / 2) - (textHeight / 2)))
Else
isOwnerPainting = True
MyBase.OnPaint(pe)
End If
isOwnerPainting = True
End Sub
End Class
感谢您的帮助。
编辑:差异图片:img(无法在此处发布 img)
【问题讨论】:
-
如果可能的话,差异的屏幕截图可能会有所帮助。图形对象上不同的 AntiAlias/ClearType 设置可能导致相同的字体/样式看起来不同
-
使用 TextRenderer.DrawText 代替 DrawString。这就是按钮的用途。
-
TextRenderer.DrawText 解决了这个问题。非常感谢。
标签: vb.net winforms overriding onpaint