C# 在鼠标悬停或单击时重新绘制按钮图形

我创建了一个自定义按钮（CloseButton），如下所示：

当我将鼠标移到按钮上时，它会将颜色变为红色，如下所示：

我想在鼠标悬停在按钮上时，将按钮上的“X”重新绘制为白色，使其看起来像这样（我已经用油漆修改了上面的图像，以显示我希望它的外观）：

我不知道该怎么做

我的自定义按钮基本上继承了常规按钮控件，并带有一些自定义设置。代码如下：

public class CloseButton : Button
{
    public CloseButton()
    {
        this.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
        this.FlatAppearance.BorderSize = 0;
        this.FlatAppearance.MouseDownBackColor = System.Drawing.Color.IndianRed;
        this.FlatAppearance.MouseOverBackColor = System.Drawing.Color.DarkRed;
        this.FlatStyle = System.Windows.Forms.FlatStyle.Flat;
        this.Size = new System.Drawing.Size(50, 30);
        this.UseVisualStyleBackColor = true;
    }

    protected override void OnPaint(PaintEventArgs e)
    {
        base.OnPaint(e);
        GraphicsPath gPath;
        Pen gPen;
        gPen = new Pen(System.Drawing.SystemColors.ControlText);
        gPath = new GraphicsPath();
        gPath.AddLine(20, 10, 30, 20);
        gPath.CloseFigure();
        gPath.AddLine(20, 20, 30, 10);
        gPath.CloseFigure();
        e.Graphics.DrawPath(gPen, gPath);
    }
}

if ((this.BackColor.Equals(System.Drawing.Color.DarkRed) || this.BackColor.Equals(System.Drawing.Color.IndianRed))
{
    gPen = new Pen(System.Drawing.SystemColors.ControlLightLight;
}
else
{
    gPen = new Pen(System.Drawing.SystemColors.ControlText;
}

_BtnClose.Invalidate();
_BtnClose.Refresh();

我尝试更改OnPaint（）方法，使笔的颜色由控件的背景色决定，如下所示：

public class CloseButton : Button
{
    public CloseButton()
    {
        this.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
        this.FlatAppearance.BorderSize = 0;
        this.FlatAppearance.MouseDownBackColor = System.Drawing.Color.IndianRed;
        this.FlatAppearance.MouseOverBackColor = System.Drawing.Color.DarkRed;
        this.FlatStyle = System.Windows.Forms.FlatStyle.Flat;
        this.Size = new System.Drawing.Size(50, 30);
        this.UseVisualStyleBackColor = true;
    }

    protected override void OnPaint(PaintEventArgs e)
    {
        base.OnPaint(e);
        GraphicsPath gPath;
        Pen gPen;
        gPen = new Pen(System.Drawing.SystemColors.ControlText);
        gPath = new GraphicsPath();
        gPath.AddLine(20, 10, 30, 20);
        gPath.CloseFigure();
        gPath.AddLine(20, 20, 30, 10);
        gPath.CloseFigure();
        e.Graphics.DrawPath(gPen, gPath);
    }
}

if ((this.BackColor.Equals(System.Drawing.Color.DarkRed) || this.BackColor.Equals(System.Drawing.Color.IndianRed))
{
    gPen = new Pen(System.Drawing.SystemColors.ControlLightLight;
}
else
{
    gPen = new Pen(System.Drawing.SystemColors.ControlText;
}

_BtnClose.Invalidate();
_BtnClose.Refresh();

然后在我的MouseEnter和Click handlers中，按如下方式使控件无效并刷新：

public class CloseButton : Button
{
    public CloseButton()
    {
        this.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
        this.FlatAppearance.BorderSize = 0;
        this.FlatAppearance.MouseDownBackColor = System.Drawing.Color.IndianRed;
        this.FlatAppearance.MouseOverBackColor = System.Drawing.Color.DarkRed;
        this.FlatStyle = System.Windows.Forms.FlatStyle.Flat;
        this.Size = new System.Drawing.Size(50, 30);
        this.UseVisualStyleBackColor = true;
    }

    protected override void OnPaint(PaintEventArgs e)
    {
        base.OnPaint(e);
        GraphicsPath gPath;
        Pen gPen;
        gPen = new Pen(System.Drawing.SystemColors.ControlText);
        gPath = new GraphicsPath();
        gPath.AddLine(20, 10, 30, 20);
        gPath.CloseFigure();
        gPath.AddLine(20, 20, 30, 10);
        gPath.CloseFigure();
        e.Graphics.DrawPath(gPen, gPath);
    }
}

if ((this.BackColor.Equals(System.Drawing.Color.DarkRed) || this.BackColor.Equals(System.Drawing.Color.IndianRed))
{
    gPen = new Pen(System.Drawing.SystemColors.ControlLightLight;
}
else
{
    gPen = new Pen(System.Drawing.SystemColors.ControlText;
}

_BtnClose.Invalidate();
_BtnClose.Refresh();

---

这没什么用。我如何才能实现我正在努力做的事情？如果我卡住了，我总是可以创建另一个自定义按钮，上面画一个白色的X，然后根据需要显示/隐藏此按钮，但如果可能，我希望避免这样做，我会这样写，然后：

public class CloseButton : Button
{

    GraphicsPath gPath;

    public CloseButton()
    {
        this.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
        this.FlatAppearance.BorderSize = 0;
        this.FlatAppearance.MouseDownBackColor = System.Drawing.Color.IndianRed;
        this.FlatAppearance.MouseOverBackColor = System.Drawing.Color.DarkRed;
        this.FlatStyle = System.Windows.Forms.FlatStyle.Flat;
        this.Size = new System.Drawing.Size(50, 30);
        this.UseVisualStyleBackColor = true;

        gPath = new GraphicsPath();
        gPath.AddLine(20, 10, 30, 20);
        gPath.CloseFigure();
        gPath.AddLine(20, 20, 30, 10);
        gPath.CloseFigure();
    }

    protected override void OnPaint(PaintEventArgs e)
    {
        base.OnPaint(e);
        bool cursorInControl = this.ClientRectangle.Contains(this.PointToClient(Cursor.Position));
        using (Pen gPen = new Pen(cursorInControl ? System.Drawing.SystemColors.ControlLightLight : System.Drawing.SystemColors.ControlText))
        {
            e.Graphics.DrawPath(gPen, gPath);
        }                
    }
}

---

GraphicsPath从不更改，因此它在控制级别声明并保留以供将来使用，而不是每次重新创建它。此外，无论何时创建笔，都必须将其丢弃，从而使用

块。最后，我们将电流转换为，以便确定它是否在控制范围内。这用于在绘制图形时切换颜色。另一个绘制十字和更改十字颜色的简单选项是：


您可以使用
✕用于绘制十字的字符。您可以通过字体大小轻松更改其大小

更改
✕颜色，足够处理
MouseEnter
和
MouseLeave
并分配
ForeColor
。它将重新绘制按钮

您可以使用
☐最大化字符，
❐用于恢复和
━用于最小化：



通过向构造函数中添加以下行，可以使按钮不可选择，以防止鼠标或键盘选择：

SetStyle(ControlStyles.Selectable, false);

通过添加以下代码，可以将关闭行为添加到按钮
ForeColor
：

protected override void OnClick(EventArgs e)
{
    base.OnClick(e);
    FindForm()?.Close();
}

如果您想要一个带有较大十字的较大按钮，请更改按钮大小及其字体大小：

MouseOverBackColor在按钮渲染器中用于绘制按钮，它不会更改背景色。考虑一个简单的BOOL字段，在OnMousEnter（）中设置为true，并返回OnMouSeLeavee（）中的“false”。