c# - 在无边界表单上使用 windows 动画

Question

最近我（主要是出于好奇）做了一个无边界的表格。在制作了包含标题和三个按钮（最小化、最大化和关闭）的自己的标题栏之后，就像每个普通的 Windows 程序一样。我还为这些按钮编写了代码（只需询问您是否想查看代码）。

但是，我注意到没有动画。我的意思是，例如，如果我单击最小化按钮，则没有动画，程序会立即消失（它不会关闭，按钮有效，但没有动画）。在所有情况下都会发生这种情况：当我打开程序时，它会立即出现，当我关闭它时，它会立即消失。

是否有某种方法可以使用标准 Windows 程序使用的这些动画？

Answer 1

似乎不可能在无边界表单上产生动画效果。但是，有两种可能的解决方法。

1. 在 Minimize 或 Restore 之前将back 设置FormBorderStyle为 Sizable，然后再设置回 none。

2. 请改用该AnimateWindow功能。动画往往发生在窗口当前所在的位置。这些功能可以应用于任何Control，而不仅仅是顶级窗口。

这是一些示例代码：

    class FormA : Form {

        private const int WM_SYSCOMMAND = 0x0112;
        private const int SC_MINIMIZE = 0xF020;
        private const int SC_RESTORE = 0xF120; 
        protected override void WndProc(ref Message m) {
            switch (m.Msg) {
                case WM_SYSCOMMAND:
                    int command = m.WParam.ToInt32();
                    if (command == SC_RESTORE) {
                        this.FormBorderStyle = FormBorderStyle.Sizable;
                        this.ControlBox = true;
                    }
                break;
            }
            base.WndProc(ref m);
        }
    }

[DllImport("user32.dll")]
static extern bool AnimateWindow(IntPtr hwnd, int dwTime, int dwFlags);

private const int AW_VER_POSITIVE = 0x00000004;
private const int AW_VER_NEGATIVE = 0x00000008;
private const int AW_SLIDE =        0x00040000;
private const int AW_HIDE = 0x00010000;


            [STAThread]
            static void Main() {
                Application.EnableVisualStyles();
                Form f = new FormA();
                f.ControlBox = false;
                f.FormBorderStyle = FormBorderStyle.None;

                bool isMinimizing = false;
                var mb = new Button { Text = "Min" };
                mb.Click += delegate {
                    isMinimizing = true;
                    f.FormBorderStyle = FormBorderStyle.Sizable;
                    f.ControlBox = true;
                    f.WindowState = FormWindowState.Minimized;
                    f.FormBorderStyle = FormBorderStyle.None;
                    isMinimizing = false;
                    //AnimateWindow(f.Handle, 300, AW_SLIDE | AW_VER_POSITIVE | AW_HIDE);

                };
                f.SizeChanged += delegate {
                    if (isMinimizing)
                        return;
                    if (f.WindowState != FormWindowState.Minimized)
                        f.FormBorderStyle = FormBorderStyle.None;
                };

                f.Controls.Add(mb);
                Application.Run(f);
        }

Answer 2

I know that this question has been asked over a year ago, but i had the same problem and found a very nice solution. Look at this repo at Github.
Add FormBase.cs and Native.cs to your project.

What you have to do is basically to create a Form, f.e. Main.cs and derive it from FormBase

Main.cs

public Main()
{
        InitializeComponent();

        // Redraw gripper on resize
        this.SetStyle(ControlStyles.ResizeRedraw, true);
        // Ability to minimize/restore the form with animation
        this.FormBorderStyle = FormBorderStyle.Sizable;
}

// Draw the gripper on the bottom right corner
protected override void OnPaint(PaintEventArgs e)
{
        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, cCaption);
        e.Graphics.FillRectangle(Brushes.DarkBlue, rc);
        SizeGripStyle = SizeGripStyle.Hide;
}

// Override WndProc to add resize ability -> Cursor
protected override void WndProc(ref Message m)
{
        if (m.Msg == 0x84)
        {  // Trap WM_NCHITTEST
            Point pos = new Point(m.LParam.ToInt32() & 0xffff, m.LParam.ToInt32() >> 16);
            pos = this.PointToClient(pos);
            if (pos.X >= this.ClientSize.Width - cGrip && pos.Y >= this.ClientSize.Height - cGrip)
            {
                m.Result = (IntPtr)17; // HTBOTTOMRIGHT
                return;
            }
        }
        base.WndProc(ref m);
}

I also removed line 147 in FormBase.cs, because my Form had rounded edges
//SetWindowRegion(m.HWnd, 0, 0, pos.cx, pos.cy);