【发布时间】：2020-06-04 19:26:32
【问题描述】：
[C# .NET 4.0]
我正在学习 C#，我正在尝试使用具有 FormBorderStyle = FormBorderStyle.None 并且可以使用 Windows API 移动/调整大小的 C# 构建 Windows 窗体。例如，我使用用于 Google Chrome 和 Norton 360 的圆角或自定义（可移动/可调整大小）边框设计作为表单的基础。
到目前为止，我已经取得了很大进展，并且一切正常，除了 当我调整表单大小时，当您调整表单大小时，沿右边框和下边框的长度会出现黑/白闪烁快速形成。
我尝试在构造函数中添加this.DoubleBuffer = true，也尝试过this.SetStyles(ControlStyles.AllPaintInWmPaint | ControlStyles.OptimizedDoubleBuffer | ControlStyles.ResizeRedraw | ControlStyles.UserPaint, true);。
因为我是图形方面的傻瓜，所以我喜欢控制表单的完整设计，所以我可以看到这会永远困扰我......所以如果有人可以帮我解决这个问题，让闪烁不再发生，这对我的学习过程非常有用。
我还应该提到我使用的是 Windows XP，所以我不确定 this post 是否会帮助我，因为它似乎专注于 Vista/7（使用 DWM）。 ..并不是说我已经足够先进，无法理解该帖子中的所有内容。
使用 API 的两部分代码如下。我有一个用于 Windows API 的 WM_NCHITTEST 的公共枚举...您可以看到值 in this link。
OnPaint 覆盖方法：
protected override void OnPaint(PaintEventArgs e)
{
System.IntPtr ptrBorder = CreateRoundRectRgn(0, 0,
this.ClientSize.Width, this.ClientSize.Height, 15, 15);
SetWindowRgn(this.Handle, ptrBorder, true);
Rectangle rc = new Rectangle(this.ClientSize.Width - cGrip,
this.ClientSize.Height - cGrip, cGrip, cGrip);
ControlPaint.DrawSizeGrip(e.Graphics, this.BackColor, rc);
rc = new Rectangle(0, 0, this.ClientSize.Width, 32);
e.Graphics.FillRectangle(Brushes.SlateGray, rc);
}
WndProc 覆盖方法：
protected override void WndProc(ref Message m)
{
if (m.Msg == (int)HitTest.WM_NCHITTEST)
{
// Trap WM_NCHITTEST
Point pos = new Point(m.LParam.ToInt32() & 0xffff, m.LParam.ToInt32() >> 16);
pos = this.PointToClient(pos);
if (pos.Y < cCaption)
{
m.Result = (IntPtr)HitTest.HTCAPTION;
return;
}
if (pos.X <= cGrip && pos.Y >= this.ClientSize.Height - cGrip)
{
m.Result = (IntPtr)HitTest.HTBOTTOMLEFT;
return;
}
if (pos.X >= this.ClientSize.Width - cGrip &&
pos.Y >= this.ClientSize.Height - cGrip)
{
m.Result = (IntPtr)HitTest.HTBOTTOMRIGHT;
return;
}
if (pos.X >= this.ClientSize.Width - cBorder)
{
m.Result = (IntPtr)HitTest.HTRIGHT;
return;
}
if (pos.Y >= this.ClientSize.Height - cBorder)
{
m.Result = (IntPtr)HitTest.HTBOTTOM;
return;
}
if (pos.X <= cBorder)
{
m.Result = (IntPtr)HitTest.HTLEFT;
return;
}
}
base.WndProc(ref m);
}
这是完整的代码：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
namespace PracticeForm
{
public partial class Form2 : Form
{
[DllImport("user32.dll")]
private static extern int SetWindowRgn(IntPtr hWnd, IntPtr hRgn, bool bRedraw);
[DllImport("gdi32.dll")]
private static extern IntPtr CreateRoundRectRgn(int x1, int y1, int x2, int y2, int cx, int cy);
[DllImport("gdi32.dll", EntryPoint = "DeleteObject")]
private static extern bool DeleteObject(System.IntPtr hObject);
private const int cGrip = 20;
private const int cCaption = 35;
private const int cBorder = 7;
private Point mouseOffset;
public Form2()
{
InitializeComponent();
this.FormBorderStyle = FormBorderStyle.None;
this.MaximumSize = new Size(670, 440);
this.DoubleBuffered = true;
this.SetStyle(ControlStyles.ResizeRedraw |
ControlStyles.OptimizedDoubleBuffer |
ControlStyles.AllPaintingInWmPaint |
ControlStyles.UserPaint, true);
}
protected override void OnPaint(PaintEventArgs e)
{
System.IntPtr ptrBorder = CreateRoundRectRgn(0, 0,
this.ClientSize.Width, this.ClientSize.Height, 15, 15);
SetWindowRgn(this.Handle, ptrBorder, true);
Rectangle rc = new Rectangle(this.ClientSize.Width - cGrip,
this.ClientSize.Height - cGrip, cGrip, cGrip);
ControlPaint.DrawSizeGrip(e.Graphics, this.BackColor, rc);
}
protected override void WndProc(ref Message m)
{
if (m.Msg == (int)HitTest.WM_NCHITTEST)
{
// Trap WM_NCHITTEST
Point pos = new Point(m.LParam.ToInt32() & 0xffff, m.LParam.ToInt32() >> 16);
pos = this.PointToClient(pos);
if (pos.Y < cCaption)
{
m.Result = (IntPtr)HitTest.HTCAPTION;
return;
}
if (pos.X <= cGrip && pos.Y >= this.ClientSize.Height - cGrip)
{
m.Result = (IntPtr)HitTest.HTBOTTOMLEFT;
return;
}
if (pos.X >= this.ClientSize.Width - cGrip &&
pos.Y >= this.ClientSize.Height - cGrip)
{
m.Result = (IntPtr)HitTest.HTBOTTOMRIGHT;
return;
}
if (pos.X >= this.ClientSize.Width - cBorder)
{
m.Result = (IntPtr)HitTest.HTRIGHT;
return;
}
if (pos.Y >= this.ClientSize.Height - cBorder)
{
m.Result = (IntPtr)HitTest.HTBOTTOM;
return;
}
if (pos.X <= cBorder)
{
m.Result = (IntPtr)HitTest.HTLEFT;
return;
}
}
base.WndProc(ref m);
}
private void button1_Click(object sender, EventArgs e)
{
this.Close();
}
private void button2_MouseClick(object sender, MouseEventArgs e)
{
this.WindowState = FormWindowState.Minimized;
}
private void panel1_MouseDown(object sender, MouseEventArgs e)
{
mouseOffset = new Point(-e.X, -e.Y);
}
private void panel1_MouseMove(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
Point p = Control.MousePosition;
p.Offset(mouseOffset.X, mouseOffset.Y);
Location = p;
}
}
private void label1_MouseDown(object sender, MouseEventArgs e)
{
mouseOffset = new Point(-e.X, -e.Y);
}
private void label1_MouseMove(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
Point p = Control.MousePosition;
p.Offset(mouseOffset.X, mouseOffset.Y);
Location = p;
}
}
}
}
感谢您的帮助。
【问题讨论】：
标签： c# .net winforms winapi windows-xp