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RoundedForm.cs
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RoundedForm.cs
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using System;
using System.Drawing;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.ComponentModel;
public class RoundedForm : Form {
private const int WM_NCPAINT = 0x0085;
private const int WM_NCCALCSIZE = 0x0083;
private const int ButtonSize = 20; // 按钮尺寸
private const int ButtonPadding = 10; // 按钮间距
private Rectangle closeButtonRect;
private Rectangle dotButtonRect;
[DllImport("gdi32.dll", EntryPoint = "CreateRoundRectRgn")]
private static extern IntPtr CreateRoundRectRgn(int nLeftRect, int nTopRect, int nRightRect, int nBottomRect, int nWidthEllipse, int nHeightEllipse);
[DllImport("user32.dll")]
private static extern bool SetWindowRgn(IntPtr hWnd, IntPtr hRgn, bool bRedraw);
// Public properties
[Browsable(true)]
[Category("Appearance")]
[Description("Gets or sets the corner radius of the rounded form.")]
public int CornerRadius { get; set; } = 20;
[Browsable(true)]
[Category("Appearance")]
[Description("Gets or sets the background color of the rounded form.")]
public Color BackgroundColor { get; set; } = Color.LightBlue;
[Browsable(true)]
[Category("Appearance")]
[Description("Gets or sets the color of the close button.")]
public Color CloseButtonColor { get; set; } = Color.Black;
[Browsable(true)]
[Category("Appearance")]
[Description("Gets or sets the color of the close button when hovered.")]
public Color CloseButtonHoverColor { get; set; } = Color.DarkGray;
[Browsable(true)]
[Category("Appearance")]
[Description("Gets or sets the color of the dot button.")]
public Color DotButtonColor { get; set; } = Color.Gray;
[Browsable(true)]
[Category("Appearance")]
[Description("Gets or sets the color of the dot button when hovered.")]
public Color DotButtonHoverColor { get; set; } = Color.DarkGray;
[Browsable(true)]
[Category("Behavior")]
[Description("Gets or sets the action to be triggered when the dot button is clicked.")]
public Action DotButtonClickAction { get; set; }
private bool isHoveringCloseButton = false;
private bool isHoveringDotButton = false;
public RoundedForm() {
this.FormBorderStyle = FormBorderStyle.None;
this.Load += new EventHandler(RoundedForm_Load);
this.Paint += new PaintEventHandler(RoundedForm_Paint);
this.MouseDown += new MouseEventHandler(RoundedForm_MouseDown);
this.MouseMove += new MouseEventHandler(RoundedForm_MouseMove);
this.MouseUp += new MouseEventHandler(RoundedForm_MouseUp);
this.MouseLeave += new EventHandler(RoundedForm_MouseLeave);
}
private void RoundedForm_Load(object sender, EventArgs e) {
SetWindowRegion();
ArrangeButtons();
}
private void RoundedForm_Paint(object sender, PaintEventArgs e) {
// Draw background color
using (SolidBrush brush = new SolidBrush(BackgroundColor)) {
e.Graphics.FillRectangle(brush, this.ClientRectangle);
}
// Draw close button
closeButtonRect = new Rectangle(this.ClientSize.Width - ButtonSize - ButtonPadding, ButtonPadding, ButtonSize, ButtonSize);
Color closeButtonColor = isHoveringCloseButton ? CloseButtonHoverColor : CloseButtonColor;
// Draw close button body
using (Pen pen = new Pen(closeButtonColor, 2)) {
e.Graphics.DrawLine(pen, closeButtonRect.Left + 4, closeButtonRect.Top + 4, closeButtonRect.Right - 4, closeButtonRect.Bottom - 4);
e.Graphics.DrawLine(pen, closeButtonRect.Left + 4, closeButtonRect.Bottom - 4, closeButtonRect.Right - 4, closeButtonRect.Top + 4);
}
// Draw dot button (three horizontal dots)
dotButtonRect = new Rectangle(this.ClientSize.Width - 2 * (ButtonSize + ButtonPadding), ButtonPadding, ButtonSize, ButtonSize);
Color dotButtonColor = isHoveringDotButton ? DotButtonHoverColor : DotButtonColor;
// Draw three horizontal dots, centered vertically with close button
using (SolidBrush dotBrush = new SolidBrush(dotButtonColor)) {
int dotSize = 4;
int startX = dotButtonRect.Left + (ButtonSize - 3 * dotSize - 2 * 3) / 2; // Adjusted spacing
int centerY = dotButtonRect.Top + (ButtonSize - dotSize) / 2;
e.Graphics.FillEllipse(dotBrush, startX, centerY, dotSize, dotSize);
e.Graphics.FillEllipse(dotBrush, startX + dotSize + 3, centerY, dotSize, dotSize);
e.Graphics.FillEllipse(dotBrush, startX + 2 * (dotSize + 3), centerY, dotSize, dotSize);
}
}
protected override void OnSizeChanged(EventArgs e) {
base.OnSizeChanged(e);
if (this.Handle != IntPtr.Zero) {
SetWindowRegion();
ArrangeButtons();
}
}
private void SetWindowRegion() {
IntPtr hRgn = CreateRoundRectRgn(0, 0, this.Width, this.Height, CornerRadius, CornerRadius);
SetWindowRgn(this.Handle, hRgn, true);
}
protected override void WndProc(ref Message m) {
if (m.Msg == WM_NCCALCSIZE || m.Msg == WM_NCPAINT) {
return;
}
base.WndProc(ref m);
}
private bool isDragging = false;
private Point dragStartPoint;
private void RoundedForm_MouseDown(object sender, MouseEventArgs e) {
if (e.Button == MouseButtons.Left) {
if (closeButtonRect.Contains(e.Location)) {
this.Close();
}
else if (dotButtonRect.Contains(e.Location) && DotButtonClickAction != null) {
DotButtonClickAction.Invoke();
}
else {
isDragging = true;
dragStartPoint = e.Location;
}
}
}
private void RoundedForm_MouseMove(object sender, MouseEventArgs e) {
if (isDragging) {
this.Left += e.X - dragStartPoint.X;
this.Top += e.Y - dragStartPoint.Y;
}
else {
bool newHoverClose = closeButtonRect.Contains(e.Location);
bool newHoverDot = dotButtonRect.Contains(e.Location);
if (newHoverClose != isHoveringCloseButton) {
isHoveringCloseButton = newHoverClose;
this.Invalidate();
}
if (newHoverDot != isHoveringDotButton) {
isHoveringDotButton = newHoverDot;
this.Invalidate();
}
}
}
private void RoundedForm_MouseUp(object sender, MouseEventArgs e) {
if (e.Button == MouseButtons.Left) {
isDragging = false;
}
}
private void RoundedForm_MouseLeave(object sender, EventArgs e) {
if (isHoveringCloseButton || isHoveringDotButton) {
isHoveringCloseButton = false;
isHoveringDotButton = false;
this.Invalidate();
}
}
private void ArrangeButtons() {
closeButtonRect = new Rectangle(this.ClientSize.Width - ButtonSize - ButtonPadding, ButtonPadding, ButtonSize, ButtonSize);
dotButtonRect = new Rectangle(this.ClientSize.Width - 2 * (ButtonSize + ButtonPadding), ButtonPadding, ButtonSize, ButtonSize);
}
}