// THIS FILE IS PART OF Vanara PROJECT
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// THE Vanara PROJECT IS AN OPENSOURCE LIBRARY LICENSED UNDER THE MIT License.
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// COPYRIGHT (C) dahall. ALL RIGHTS RESERVED.
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// GITHUB: https://github.com/dahall/Vanara
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using System.Runtime.InteropServices;
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namespace Vanara.PInvoke
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{
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/// <summary>Encapsulates classes exposed by DWNAPI.DLL</summary>
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public static partial class DwmApi
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{
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/// <summary>Extends the window frame into the client area.</summary>
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/// <param name="hWnd">The handle to the window in which the frame will be extended into the client area.</param>
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/// <param name="pMarInset">
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/// A pointer to a MARGINS structure that describes the margins to use when extending the frame into the client area.
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/// </param>
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/// <returns>If this function succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.</returns>
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[DllImport("dwmapi.dll", SetLastError = false, ExactSpelling = true)]
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[System.Security.SecurityCritical]
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[PInvokeData("dwmapi.h")]
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public static extern void DwmExtendFrameIntoClientArea(HWND hWnd, in MARGINS pMarInset);
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/// <summary>Returned by the GetThemeMargins function to define the margins of windows that have visual styles applied.</summary>
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[StructLayout(LayoutKind.Sequential)]
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[PInvokeData("dwmapi.h")]
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public struct MARGINS
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{
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/// <summary>Width of the left border that retains its size.</summary>
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public int cxLeftWidth;
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/// <summary>Width of the right border that retains its size.</summary>
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public int cxRightWidth;
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/// <summary>Height of the top border that retains its size.</summary>
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public int cyTopHeight;
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/// <summary>Height of the bottom border that retains its size.</summary>
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public int cyBottomHeight;
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/// <summary>Retrieves a <see cref="MARGINS"/> instance with all values set to 0.</summary>
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public static readonly MARGINS Empty = new MARGINS(0);
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/// <summary>Retrieves a <see cref="MARGINS"/> instance with all values set to -1.</summary>
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public static readonly MARGINS Infinite = new MARGINS(-1);
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/// <summary>Initializes a new instance of the <see cref="MARGINS"/> struct.</summary>
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/// <param name="left">The left border value.</param>
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/// <param name="right">The right border value.</param>
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/// <param name="top">The top border value.</param>
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/// <param name="bottom">The bottom border value.</param>
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public MARGINS(int left, int right, int top, int bottom)
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{
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cxLeftWidth = left;
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cxRightWidth = right;
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cyTopHeight = top;
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cyBottomHeight = bottom;
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}
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/// <summary>Initializes a new instance of the <see cref="MARGINS"/> struct.</summary>
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/// <param name="allMargins">Value to assign to all margins.</param>
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public MARGINS(int allMargins) => cxLeftWidth = cxRightWidth = cyTopHeight = cyBottomHeight = allMargins;
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/// <summary>Gets or sets the left border value.</summary>
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/// <value>The left border.</value>
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public int Left { get => cxLeftWidth; set => cxLeftWidth = value; }
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/// <summary>Gets or sets the right border value.</summary>
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/// <value>The right border.</value>
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public int Right { get => cxRightWidth; set => cxRightWidth = value; }
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/// <summary>Gets or sets the top border value.</summary>
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/// <value>The top border.</value>
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public int Top { get => cyTopHeight; set => cyTopHeight = value; }
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/// <summary>Gets or sets the bottom border value.</summary>
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/// <value>The bottom border.</value>
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public int Bottom { get => cyBottomHeight; set => cyBottomHeight = value; }
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/// <summary>Determines if two <see cref="MARGINS"/> values are not equal.</summary>
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/// <param name="m1">The first margin.</param>
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/// <param name="m2">The second margin.</param>
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/// <returns><c>true</c> if the values are unequal; <c>false</c> otherwise.</returns>
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public static bool operator !=(MARGINS m1, MARGINS m2) => !m1.Equals(m2);
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/// <summary>Determines if two <see cref="MARGINS"/> values are equal.</summary>
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/// <param name="m1">The first margin.</param>
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/// <param name="m2">The second margin.</param>
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/// <returns><c>true</c> if the values are equal; <c>false</c> otherwise.</returns>
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public static bool operator ==(MARGINS m1, MARGINS m2) => m1.Equals(m2);
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/// <summary>Determines whether the specified <see cref="object"/>, is equal to this instance.</summary>
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/// <param name="obj">The <see cref="object"/> to compare with this instance.</param>
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/// <returns><c>true</c> if the specified <see cref="object"/> is equal to this instance; otherwise, <c>false</c>.</returns>
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public override bool Equals(object obj) => obj is MARGINS m2
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? cxLeftWidth == m2.cxLeftWidth && cxRightWidth == m2.cxRightWidth && cyTopHeight == m2.cyTopHeight &&
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cyBottomHeight == m2.cyBottomHeight
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: base.Equals(obj);
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/// <summary>Returns a hash code for this instance.</summary>
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/// <returns>A hash code for this instance, suitable for use in hashing algorithms and data structures like a hash table.</returns>
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public override int GetHashCode()
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{
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int RotateLeft(int value, int nBits)
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{
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nBits = nBits % 0x20;
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return (value << nBits) | (value >> (0x20 - nBits));
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}
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return cxLeftWidth ^ RotateLeft(cyTopHeight, 8) ^ RotateLeft(cxRightWidth, 0x10) ^ RotateLeft(cyBottomHeight, 0x18);
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}
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/// <summary>Returns a <see cref="string"/> that represents this instance.</summary>
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/// <returns>A <see cref="string"/> that represents this instance.</returns>
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public override string ToString() => $"{{Left={cxLeftWidth},Right={cxRightWidth},Top={cyTopHeight},Bottom={cyBottomHeight}}}";
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}
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}
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}
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