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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using System;2
using System.Drawing;3
using System.Windows.Forms;4
using System.Runtime.InteropServices;5

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class FontDialog : System.Windows.Forms.FontDialog7
{8
public int Left { get { return r.Left ; } set { r.Left = value; } }9
public int Top { get { return r.Top ; } set { r.Top = value; } }10
public int Width { get { return r.Width ; } set { r.Width = value; } }11
public int Height { get { return r.Height ; } set { r.Height = value; } }12
public Point Location { get { return r.Location; } set { r.Location = value; } }13
public Size Size { get { return r.Size ; } }14

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Rect r;16

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const uint SWP_NOSIZE = 1;18
const uint SWP_NOZORDER = 4;19

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[DllImport("user32.dll")] 21
static extern IntPtr GetWindowRect(IntPtr hWnd, ref Rect rect);22

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[DllImport("user32.dll")]24
static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int X, int Y, int cx, int cy, uint uFlags);25

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[System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name="FullTrust")]27
protected override IntPtr HookProc(IntPtr hWnd, int msg, IntPtr wParam, IntPtr lParam)28
{29
SetWindowPos(hWnd, (IntPtr)0, Left, Top, 0, 0, SWP_NOSIZE | SWP_NOZORDER);30
GetWindowRect(hWnd, ref r);31
return base.HookProc(hWnd, msg, wParam, lParam);32
}33
}34

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class Form1 : Form36
{37
Form1()38
{39
Button btn = new Button();40
btn.Parent = this;41
btn.Text = "&Font";42
btn.Click += delegate43
{44
FontDialog fd = new FontDialog();45
fd.Location = new Point(10, 50);46
fd.ShowDialog();47
};48
}49

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static void Main()51
{52
Application.Run(new Form1());53
}54
}55

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[StructLayout(LayoutKind.Sequential)]57
public struct Rect 58
{ 59
public int Left; 60
public int Top; 61
public int Right; 62
public int Bottom;63

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public int Width { get { return Right - Left; } set { Right = Left + value; } }65
public int Height { get { return Bottom - Top; } set { Bottom = Top + value; } }66

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public Size Size68
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get { return new Size(Width, Height); }70
set { Width = value.Width; Height = value.Height; }71
}72

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public Point Location74
{75
get { return new Point(Left, Top); }76
set { Right -= (Left - value.X); Bottom -= (Bottom - value.Y); Left = value.X; Top = value.Y; }77
}78

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public override string ToString()80
{81
return string.Format("{{X={0},Y={1},Width={2},Height={3}}}", Left, Top, Width, Height);82
}83
}84



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