Question

我创建了一个自定义类，它使用了一个继承的面板，一个图片框和两个标签，用作＆＃34;图标＆＃34;在表单上供用户在整个应用程序中单击和导航。我这样做是因为它提供了更好的图形印象，并且比单独一个按钮更具可定制性。

我已经包含了一个类来从以下codeproject中绘制圆角矩形（它们在面板上绘制以使面板看起来像圆角）： http://www.codeproject.com/Articles/5649/Extended-Graphics-An-implementation-of-Rounded-Rec

关于绘画，我已连接我的MouseEnter和MouseLeave事件以切换布尔值，然后调用me.invalidate（）以根据事件设置的布尔值重绘面板背景。我重绘的代码如下：

 If mouseoverBool Then 'class variable mouseoverBool set by mouseenter/mouseleave to true/false

        Dim g As Graphics = e.Graphics
        g.SmoothingMode = SmoothingMode.AntiAlias
        Dim brush As New LinearGradientBrush(New Point(Me.Width / 2, 0), New Point(Me.Width / 2, Me.Height), Color.LightSteelBlue, Color.LightBlue)
        g.FillRoundedRectangle(brush, 0, 0, Me.Width - 1, Me.Height, 10)
        g.FillRoundedRectangle(New SolidBrush(Color.FromArgb(100, 118, 173, 218)), 0, 0, Me.Width, Me.Height, 10)
        g.DrawRoundedRectangle(New Pen(ControlPaint.Light(SystemColors.InactiveBorder, 0.0F)), 0, 0, Me.Width - 1, Me.Height - 1, 10)

    Else

        Dim g As Graphics = e.Graphics
        g.SmoothingMode = SmoothingMode.AntiAlias
        Dim brush As New LinearGradientBrush(New Point(Me.Width / 2, 0), New Point(Me.Width / 2, Me.Height), SystemColors.GradientInactiveCaption, ControlPaint.Dark(SystemColors.GradientActiveCaption, 0.5F))
        g.FillRoundedRectangle(brush, 0, 0, Me.Width - 1, Me.Height, 10)
        g.FillRoundedRectangle(New SolidBrush(Color.FromArgb(100, 118, 173, 218)), 0, 0, Me.Width, Me.Height, 10)
        g.DrawRoundedRectangle(New Pen(ControlPaint.Light(SystemColors.InactiveBorder, 0.0F)), 0, 0, Me.Width - 1, Me.Height - 1, 10)

       End If

或者在C＃中：

if (mouseoverBool) {

Graphics g = e.Graphics;
g.SmoothingMode = SmoothingMode.AntiAlias;
LinearGradientBrush brush = new LinearGradientBrush(new Point(this.Width / 2, 0), new Point(this.Width / 2, this.Height), Color.LightSteelBlue, Color.LightBlue);
g.FillRoundedRectangle(brush, 0, 0, this.Width - 1, this.Height, 10);
g.FillRoundedRectangle(new SolidBrush(Color.FromArgb(100, 118, 173, 218)), 0, 0, this.Width, this.Height, 10);
g.DrawRoundedRectangle(new Pen(ControlPaint.Light(SystemColors.InactiveBorder, 0f)), 0, 0, this.Width - 1, this.Height - 1, 10);

} else {

Graphics g = e.Graphics;
g.SmoothingMode = SmoothingMode.AntiAlias;
LinearGradientBrush brush = new LinearGradientBrush(new Point(this.Width / 2, 0), new Point(this.Width / 2, this.Height), SystemColors.GradientInactiveCaption, ControlPaint.Dark(SystemColors.GradientActiveCaption, 0.5f));
g.FillRoundedRectangle(brush, 0, 0, this.Width - 1, this.Height, 10);
g.FillRoundedRectangle(new SolidBrush(Color.FromArgb(100, 118, 173, 218)), 0, 0, this.Width, this.Height, 10);
g.DrawRoundedRectangle(new Pen(ControlPaint.Light(SystemColors.InactiveBorder, 0f)), 0, 0, this.Width - 1, this.Height - 1, 10);

}

出现的问题是面板内的标签和图片框（所有控件设置为透明背景）在第一次自定义＆＃34; icon＆＃34;面板绘制背景。小组描绘，然后半秒钟后，标签和图片框上的背景最终更新。我假设这是因为调用.invalidate（）强制自定义面板重绘，然后随后是所有控件。我正在追求一个无缝的＆＃39;油漆整个控件一次涂料，包括标签和图片框。我该如何尝试实现这一目标？

Answer 1

我在自定义面板中使用了2个标签和一个图片框来显示文字和图片。正如评论中指出的那样，您可以轻松地自己绘制这些项目（这不仅更快，而且更有意义，因为您必须通过首先使用控件来处理所有控件mouseEnter / mouseLeave事件），这会停止闪烁来自发生。

由于我已经创建了用于保存图像和标签文本的属性（与之前的控件一起使用），因此很容易将其转换为自定义面板的绘制事件。

    e.Graphics.DrawString(Me.txtHeaderDescription, New Font("Calibri", 12, FontStyle.Italic), Brushes.White, New Point(105, 15))

    Dim sf As New StringFormat
    sf.Alignment = StringAlignment.Near
    Dim Rectf As RectangleF = New Rectangle(105, 35, 200, 75)
    e.Graphics.DrawString(Me.txtDescription, New Font("Calibri", 8, FontStyle.Regular), Brushes.White, Rectf, sf)

    e.Graphics.DrawImage(Me.MyImage, 5, 3, 96, 96)

面板控件上的慢涂料

1 个答案: