为System.Windows.Forms.FontDialog类添加Location属性
FontDialog类继承自CommonDialog,没有Location及Size属性,其他自CommonDialog派生的类,如ColorDialog、FileDialog等也是如此。
API函数GetWindowRect、SetWindowPos可以获取和设置窗体的位置和大小。
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using System;
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using System.Drawing;
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using System.Windows.Forms;
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using System.Runtime.InteropServices;
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class FontDialog : System.Windows.Forms.FontDialog
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{
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public int Left { get { return r.Left ; } set { r.Left = value; } }
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public int Top { get { return r.Top ; } set { r.Top = value; } }
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public int Width { get { return r.Width ; } set { r.Width = value; } }
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public int Height { get { return r.Height ; } set { r.Height = value; } }
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public Point Location { get { return r.Location; } set { r.Location = value; } }
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public Size Size { get { return r.Size ; } }
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Rect r;
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const uint SWP_NOSIZE = 1;
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const uint SWP_NOZORDER = 4;
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[DllImport("user32.dll")]
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static extern IntPtr GetWindowRect(IntPtr hWnd, ref Rect rect);
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[DllImport("user32.dll")]
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static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int X, int Y, int cx, int cy, uint uFlags);
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[System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name="FullTrust")]
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protected override IntPtr HookProc(IntPtr hWnd, int msg, IntPtr wParam, IntPtr lParam)
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{
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SetWindowPos(hWnd, (IntPtr)0, Left, Top, 0, 0, SWP_NOSIZE | SWP_NOZORDER);
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GetWindowRect(hWnd, ref r);
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return base.HookProc(hWnd, msg, wParam, lParam);
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}
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}
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class Form1 : Form
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{
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Form1()
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{
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Button btn = new Button();
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btn.Parent = this;
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btn.Text = "&Font";
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btn.Click += delegate
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{
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FontDialog fd = new FontDialog();
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fd.Location = new Point(10, 50);
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fd.ShowDialog();
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};
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}
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static void Main()
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{
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Application.Run(new Form1());
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}
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}
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[StructLayout(LayoutKind.Sequential)]
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public struct Rect
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{
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public int Left;
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public int Top;
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public int Right;
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public int Bottom;
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public int Width { get { return Right - Left; } set { Right = Left + value; } }
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public int Height { get { return Bottom - Top; } set { Bottom = Top + value; } }
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public Size Size
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{
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get { return new Size(Width, Height); }
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set { Width = value.Width; Height = value.Height; }
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}
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public Point Location
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{
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get { return new Point(Left, Top); }
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set { Right -= (Left - value.X); Bottom -= (Bottom - value.Y); Left = value.X; Top = value.Y; }
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}
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public override string ToString()
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{
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return string.Format("{{X={0},Y={1},Width={2},Height={3}}}", Left, Top, Width, Height);
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}
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}
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