Create a borderless form: both beautiful and resizable
When designing custom form interfaces, developers usually prefer a simple borderless appearance. Although Windows provides an easy way to remove the default borders via the "FormBorderStyle" property, this results in the form not being resizable.
To overcome this limitation, let’s explore a comprehensive code solution that allows for borderless aesthetics and seamless resizing capabilities at the same time:
public partial class Form1 : Form {
// 取消默認(rèn)邊框
public Form1() {
InitializeComponent();
this.FormBorderStyle = FormBorderStyle.None;
// 優(yōu)化標(biāo)志，提升響應(yīng)速度和美觀性
this.DoubleBuffered = true;
this.SetStyle(ControlStyles.ResizeRedraw, true);
}
// 抓取區(qū)域和標(biāo)題欄尺寸常量
private const int cGrip = 16;
private const int cCaption = 32;
// 自定義繪制抓取指示器
protected override void OnPaint(PaintEventArgs e) {
// 在右下角繪制調(diào)整大小的抓取區(qū)域
Rectangle rc = new Rectangle(this.ClientSize.Width - cGrip, this.ClientSize.Height - cGrip, cGrip, cGrip);
ControlPaint.DrawSizeGrip(e.Graphics, this.BackColor, rc);
// 通過填充特定顏色的區(qū)域來模擬標(biāo)題欄
rc = new Rectangle(0, 0, this.ClientSize.Width, cCaption);
e.Graphics.FillRectangle(Brushes.DarkBlue, rc);
}
// 攔截 WM_NCHITTEST 消息以實(shí)現(xiàn)自定義調(diào)整大小行為
protected override void WndProc(ref Message m) {
if (m.Msg == 0x84) { // 捕獲 WM_NCHITTEST 消息
Point pos = new Point(m.LParam.ToInt32());
pos = this.PointToClient(pos);
// 判斷鼠標(biāo)光標(biāo)是否在模擬標(biāo)題欄內(nèi)
if (pos.X >= this.ClientSize.Width - cGrip && pos.Y >= this.ClientSize.Height - cGrip) {
m.Result = (IntPtr)17; // HTBOTTOMRIGHT
return;
}
}
// 將未處理的消息傳遞給基類進(jìn)行默認(rèn)處理
base.WndProc(ref m);
}
}
By implementing this code in your borderless form, you can effectively enable resizing functionality while maintaining the desired aesthetics. A simulated title bar and custom grab indicators provide an intuitive and full-featured user experience, allowing users to easily resize forms.
The above is the detailed content of How to Create Resizable Borderless Forms in Windows Forms?. For more information, please follow other related articles on the PHP Chinese website!
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