C# winforms rounded-corners formborderstyle

具有自定义边框和圆角边缘的 C# 表单

发布于 2024-10-19 05:46:07 字数 1067 浏览 1 评论 0原文

我使用此代码使我的表单 (FormBorderStyle=none) 具有圆角边缘：

[DllImport("Gdi32.dll", EntryPoint = "CreateRoundRectRgn")]
private static extern IntPtr CreateRoundRectRgn
(
    int nLeftRect, // x-coordinate of upper-left corner
    int nTopRect, // y-coordinate of upper-left corner
    int nRightRect, // x-coordinate of lower-right corner
    int nBottomRect, // y-coordinate of lower-right corner
    int nWidthEllipse, // height of ellipse
    int nHeightEllipse // width of ellipse
 );

public Form1()
{
    InitializeComponent();
    Region = System.Drawing.Region.FromHrgn(CreateRoundRectRgn(0, 0, Width, Height, 20, 20));
}

这用于在 Paint 事件上设置自定义边框：

    ControlPaint.DrawBorder(e.Graphics, this.ClientRectangle, Color.Black, 5, ButtonBorderStyle.Solid, Color.Black, 5, ButtonBorderStyle.Solid, Color.Black, 5, ButtonBorderStyle.Solid, Color.Black, 5, ButtonBorderStyle.Solid);

但请参阅此屏幕截图 .

内部形状矩形没有圆角边缘。

如何使蓝色内部表单矩形也具有圆角边缘，这样它看起来就不会像屏幕截图一样？

原文

I am using this code to make my form (FormBorderStyle=none) with rounded edges:

[DllImport("Gdi32.dll", EntryPoint = "CreateRoundRectRgn")]
private static extern IntPtr CreateRoundRectRgn
(
    int nLeftRect, // x-coordinate of upper-left corner
    int nTopRect, // y-coordinate of upper-left corner
    int nRightRect, // x-coordinate of lower-right corner
    int nBottomRect, // y-coordinate of lower-right corner
    int nWidthEllipse, // height of ellipse
    int nHeightEllipse // width of ellipse
 );

public Form1()
{
    InitializeComponent();
    Region = System.Drawing.Region.FromHrgn(CreateRoundRectRgn(0, 0, Width, Height, 20, 20));
}

And this to set a custom border on the Paint event:

    ControlPaint.DrawBorder(e.Graphics, this.ClientRectangle, Color.Black, 5, ButtonBorderStyle.Solid, Color.Black, 5, ButtonBorderStyle.Solid, Color.Black, 5, ButtonBorderStyle.Solid, Color.Black, 5, ButtonBorderStyle.Solid);

But see this screenshot .

The inside form rectangle doesn't have rounded edges.

How can I make the blue inside form rectangle to have rounded edge too so it wont look like the screenshot?

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咽泪装欢 2024-10-26 05:46:07

该地区财产只是切断了角落。要获得真正的圆角，您必须绘制圆角矩形。

绘制圆角矩形

绘制圆角矩形可能会更容易您想要的形状的图像并将其放在透明表格上。更容易绘制，但无法调整大小。

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盛夏尉蓝 2024-10-26 05:46:07

请注意，您泄漏了 CreateRoundRectRgn()，您应该使用 DeleteObject() 使用后。

Region.FromHrgn() 复制定义，因此它不会释放句柄。

[DllImport("Gdi32.dll", EntryPoint = "DeleteObject")]
public static extern bool DeleteObject(IntPtr hObject);

public Form1()
{
    InitializeComponent();
    IntPtr handle = CreateRoundRectRgn(0, 0, Width, Height, 20, 20);
    if (handle == IntPtr.Zero)
        ; // error with CreateRoundRectRgn
    Region = System.Drawing.Region.FromHrgn(handle);
    DeleteObject(handle);
}

（将添加为评论，但声誉已被删除）

Note you're leaking the handle returned by CreateRoundRectRgn(), you should free it with DeleteObject() after it is used.

The Region.FromHrgn() copies the definition, so it won't free the handle.

[DllImport("Gdi32.dll", EntryPoint = "DeleteObject")]
public static extern bool DeleteObject(IntPtr hObject);

public Form1()
{
    InitializeComponent();
    IntPtr handle = CreateRoundRectRgn(0, 0, Width, Height, 20, 20);
    if (handle == IntPtr.Zero)
        ; // error with CreateRoundRectRgn
    Region = System.Drawing.Region.FromHrgn(handle);
    DeleteObject(handle);
}

(would add as comment but reputation is ded)

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