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フォームのBackgroundImageを使ったレイヤードウィンドウの作成 - C#

こちらの記事でレイヤードウィンドウの作成方法を紹介しました。今回は、フォームのBackgroundImageに設定した画像からレイヤードウィンドウを作成するコードを紹介します。

プログラム例

コード

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;
using System.Drawing.Imaging;

namespace LayeredSplashWindow
{
  public partial class Form1 : Form
  {
    [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    public static extern IntPtr GetDC(IntPtr hWnd);

    [DllImport("gdi32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    public static extern IntPtr CreateCompatibleDC(IntPtr hdc);

    [DllImport("gdi32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    public static extern IntPtr SelectObject(IntPtr hdc, IntPtr hgdiobj);

    [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    public static extern int ReleaseDC(IntPtr hWnd, IntPtr hDC);

    [DllImport("gdi32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    public static extern int DeleteObject(IntPtr hobject);

    [DllImport("gdi32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    public static extern int DeleteDC(IntPtr hdc);

    [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    public static extern int UpdateLayeredWindow(
        IntPtr hwnd,
        IntPtr hdcDst,
        [System.Runtime.InteropServices.In()]
            ref Point pptDst,
        [System.Runtime.InteropServices.In()]
            ref Size psize,
        IntPtr hdcSrc,
        [System.Runtime.InteropServices.In()]
            ref Point pptSrc,
        int crKey,
        [System.Runtime.InteropServices.In()]
            ref BLENDFUNCTION pblend,
        int dwFlags);

    public const byte AC_SRC_OVER = 0;
    public const byte AC_SRC_ALPHA = 1;
    public const int ULW_ALPHA = 2;

    public const int WM_DISPLAYCHANGE    = 0x007E;

    [StructLayout(LayoutKind.Sequential, Pack = 1)]
    public struct BLENDFUNCTION
    {
      public byte BlendOp;
      public byte BlendFlags;
      public byte SourceConstantAlpha;
      public byte AlphaFormat;
    }

    public Form1()
    {
      InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
      UpdateFormDisplay(this.BackgroundImage);
    }

    protected override CreateParams CreateParams
    {
      get
      {
        CreateParams cp = base.CreateParams;

        cp.ExStyle = cp.ExStyle | WindowsConst.WS_EX_LAYERED;
        if ((cp.ExStyle & WindowsConst.WS_EX_TRANSPARENT) != 0){
          cp.ExStyle = cp.ExStyle & WindowsConst.WS_EX_TRANSPARENT;
        }
        return cp;
      }
    }

    public void UpdateFormDisplay(Image backgroundImage)
    {
      IntPtr screenDc = GetDC(IntPtr.Zero);
      IntPtr memDc = CreateCompatibleDC(screenDc);
      IntPtr hBitmap = IntPtr.Zero;
      IntPtr oldBitmap = IntPtr.Zero;
      
      try {
        //Display-image
        Bitmap bmp = new Bitmap(backgroundImage);
        hBitmap = bmp.GetHbitmap(Color.FromArgb(0));
        oldBitmap = SelectObject(memDc, hBitmap);

        //Display-rectangle
        Size size = bmp.Size;
        Point pointSource = new Point(0, 0);
        Point topPos = new Point(this.Left, this.Top);

        //Set up blending options
        BLENDFUNCTION blend = new BLENDFUNCTION();
        blend.BlendOp = AC_SRC_OVER;
        blend.BlendFlags = 0;
        blend.SourceConstantAlpha = 255;
        blend.AlphaFormat = AC_SRC_ALPHA;

        UpdateLayeredWindow(this.Handle, screenDc,
          ref topPos, ref size, memDc, ref pointSource, 0, ref blend, ULW_ALPHA);

        //Clean-up
        bmp.Dispose();
        ReleaseDC(IntPtr.Zero, screenDc);
        if (hBitmap != IntPtr.Zero) {
          SelectObject(memDc, oldBitmap);
          DeleteObject(hBitmap);
        }
        DeleteDC(memDc);
      }
      catch (Exception) {
      }
    }
  }
}
WindowsConst.cs (定数定義)
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace MultiFormApp
{
  public static class WindowsConst
  {
    public const int WM_NCHITTEST     = 0x0084;

    /*
     * Window Styles
     */
    public const int  WS_OVERLAPPED   = 0x00000000;
    public const long WS_POPUP        = 0x80000000L; //unchecked((int) WS_POPUP) 
    public const int  WS_CHILD        = 0x40000000;
    public const int  WS_MINIMIZE     = 0x20000000;
    public const int  WS_VISIBLE      = 0x10000000;
    public const int  WS_DISABLED     = 0x08000000;
    public const int  WS_CLIPSIBLINGS = 0x04000000;
    public const int  WS_CLIPCHILDREN = 0x02000000;
    public const int  WS_MAXIMIZE     = 0x01000000;
    public const int  WS_CAPTION      = 0x00C00000;/* WS_BORDER | WS_DLGFRAME  */
    public const int  WS_BORDER       = 0x00800000;
    public const int  WS_DLGFRAME     = 0x00400000;
    public const int  WS_VSCROLL      = 0x00200000;
    public const int  WS_HSCROLL      = 0x00100000;
    public const int  WS_SYSMENU      = 0x00080000;
    public const int  WS_THICKFRAME   = 0x00040000;
    public const int  WS_GROUP        = 0x00020000;
    public const int  WS_TABSTOP      = 0x00010000;

    public const int  WS_MINIMIZEBOX  = 0x00020000;
    public const int  WS_MAXIMIZEBOX  = 0x00010000;

    public const int  WS_TILED        = WS_OVERLAPPED;
    public const int  WS_ICONIC       = WS_MINIMIZE;
    public const int  WS_SIZEBOX      = WS_THICKFRAME;
    public const int  WS_TILEDWINDOW  = WS_OVERLAPPEDWINDOW;

    /*
     * Common Window Styles
    */
    public const int WS_OVERLAPPEDWINDOW = (WS_OVERLAPPED |
                                     WS_CAPTION |
                                     WS_SYSMENU |
                                     WS_THICKFRAME |
                                     WS_MINIMIZEBOX |
                                     WS_MAXIMIZEBOX);

    public const long WS_POPUPWINDOW = (WS_POPUP |
                                     WS_BORDER |
                                     WS_SYSMENU);

    public const int WS_CHILDWINDOW = (WS_CHILD);


    /*
     * Extended Window Styles
     */
    public const int WS_EX_DLGMODALFRAME = 0x00000001;
    public const int WS_EX_NOPARENTNOTIFY = 0x00000004;
    public const int WS_EX_TOPMOST = 0x00000008;
    public const int WS_EX_ACCEPTFILES = 0x00000010;
    public const int WS_EX_TRANSPARENT = 0x00000020;
    public const int WS_EX_MDICHILD = 0x00000040;
    public const int WS_EX_TOOLWINDOW = 0x00000080;
    public const int WS_EX_WINDOWEDGE = 0x00000100;
    public const int WS_EX_CLIENTEDGE = 0x00000200;
    public const int WS_EX_CONTEXTHELP = 0x00000400;

    public const int WS_EX_RIGHT = 0x00001000;
    public const int WS_EX_LEFT = 0x00000000;
    public const int WS_EX_RTLREADING = 0x00002000;
    public const int WS_EX_LTRREADING = 0x00000000;
    public const int WS_EX_LEFTSCROLLBAR = 0x00004000;
    public const int WS_EX_RIGHTSCROLLBAR = 0x00000000;

    public const int WS_EX_CONTROLPARENT = 0x00010000;
    public const int WS_EX_STATICEDGE = 0x00020000;
    public const int WS_EX_APPWINDOW = 0x00040000;


    public const int WS_EX_OVERLAPPEDWINDOW = (WS_EX_WINDOWEDGE | WS_EX_CLIENTEDGE);
    public const int WS_EX_PALETTEWINDOW
      = (WS_EX_WINDOWEDGE | WS_EX_TOOLWINDOW | WS_EX_TOPMOST);
    public const int WS_EX_LAYERED = 0x00080000;

    public const int WS_EX_NOINHERITLAYOUT = 0x00100000; 
      // Disable inheritence of mirroring by children
    public const int WS_EX_LAYOUTRTL = 0x00400000; // Right to left mirroring

    public const int WS_EX_COMPOSITED = 0x02000000;
    public const int WS_EX_NOACTIVATE = 0x08000000;

    /*
     * WM_NCHITTEST and MOUSEHOOKSTRUCT Mouse Position Codes
     */
    public const int HTERROR = (-2);
    public const int HTTRANSPARENT = (-1);
    public const int HTNOWHERE = 0;
    public const int HTCLIENT = 1;
    public const int HTCAPTION = 2;
    public const int HTSYSMENU = 3;
    public const int HTGROWBOX = 4;
    public const int HTSIZE = HTGROWBOX;
    public const int HTMENU = 5;
    public const int HTHSCROLL = 6;
    public const int HTVSCROLL = 7;
    public const int HTMINBUTTON = 8;
    public const int HTMAXBUTTON = 9;
    public const int HTLEFT = 10;
    public const int HTRIGHT = 11;
    public const int HTTOP = 12;
    public const int HTTOPLEFT = 13;
    public const int HTTOPRIGHT = 14;
    public const int HTBOTTOM = 15;
    public const int HTBOTTOMLEFT = 16;
    public const int HTBOTTOMRIGHT = 17;
    public const int HTBORDER = 18;
    public const int HTREDUCE = HTMINBUTTON;
    public const int HTZOOM = HTMAXBUTTON;
    public const int HTSIZEFIRST = HTLEFT;
    public const int HTSIZELAST = HTBOTTOMRIGHT;

    public const int HTOBJECT = 19;
    public const int HTCLOSE = 20;
    public const int HTHELP = 21;

  }
}

画像 (Photoshop編集時)

画像は背景を抜き、透明部分を含む画像を用意します。

デザイン画面

フォームのBackgourndImageに上図の画像を設定します。

実行結果

プロジェクトを実行します。下図のウィンドウが表示されます。

画像をファイルから読み込む場合

レイヤードウィンドウのマスク画像をフォームのBackGroundImageではなくファイルから読み込む場合のコードです。下記のコードでも正しく動作します。
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;
using System.Drawing.Imaging;

namespace LayeredSplashWindow
{
  public partial class Form1 : Form
  {
    [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    public static extern IntPtr GetDC(IntPtr hWnd);

    [DllImport("gdi32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    public static extern IntPtr CreateCompatibleDC(IntPtr hdc);

    [DllImport("gdi32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    public static extern IntPtr SelectObject(IntPtr hdc, IntPtr hgdiobj);

    [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    public static extern int ReleaseDC(IntPtr hWnd, IntPtr hDC);

    [DllImport("gdi32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    public static extern int DeleteObject(IntPtr hobject);

    [DllImport("gdi32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    public static extern int DeleteDC(IntPtr hdc);

    [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    public static extern int UpdateLayeredWindow(
        IntPtr hwnd,
        IntPtr hdcDst,
        [System.Runtime.InteropServices.In()]
            ref Point pptDst,
        [System.Runtime.InteropServices.In()]
            ref Size psize,
        IntPtr hdcSrc,
        [System.Runtime.InteropServices.In()]
            ref Point pptSrc,
        int crKey,
        [System.Runtime.InteropServices.In()]
            ref BLENDFUNCTION pblend,
        int dwFlags);

    public const byte AC_SRC_OVER = 0;
    public const byte AC_SRC_ALPHA = 1;
    public const int ULW_ALPHA = 2;

    public const int WM_DISPLAYCHANGE    = 0x007E;

    [StructLayout(LayoutKind.Sequential, Pack = 1)]
    public struct BLENDFUNCTION
    {
      public byte BlendOp;
      public byte BlendFlags;
      public byte SourceConstantAlpha;
      public byte AlphaFormat;
    }

     public Form1()
    {
      InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
      //UpdateFormDisplay(this.BackgroundImage);
      Bitmap bmp = new Bitmap("fig.png");
      UpdateFormDisplay(bmp);
    }

    protected override CreateParams CreateParams
    {
      get
      {
        CreateParams cp = base.CreateParams;
       
        cp.ExStyle = cp.ExStyle | WindowsConst.WS_EX_LAYERED;
        if ((cp.ExStyle & WindowsConst.WS_EX_TRANSPARENT) != 0){
          cp.ExStyle = cp.ExStyle & WindowsConst.WS_EX_TRANSPARENT;
        }
        return cp;
      }
    }

    public void UpdateFormDisplay(Image backgroundImage)
    {
      IntPtr screenDc = GetDC(IntPtr.Zero);
      IntPtr memDc = CreateCompatibleDC(screenDc);
      IntPtr hBitmap = IntPtr.Zero;
      IntPtr oldBitmap = IntPtr.Zero;
      
      try {
        //Display-image
        Bitmap bmp = new Bitmap(backgroundImage);
        hBitmap = bmp.GetHbitmap(Color.FromArgb(0));
        oldBitmap = SelectObject(memDc, hBitmap);

        //Display-rectangle
        Size size = bmp.Size;
        Point pointSource = new Point(0, 0);
        Point topPos = new Point(this.Left, this.Top);

        //Set up blending options
        BLENDFUNCTION blend = new BLENDFUNCTION();
        blend.BlendOp = AC_SRC_OVER;
        blend.BlendFlags = 0;
        blend.SourceConstantAlpha = 255;
        blend.AlphaFormat = AC_SRC_ALPHA;

        UpdateLayeredWindow(this.Handle, screenDc,
          ref topPos, ref size, memDc, ref pointSource, 0, ref blend, ULW_ALPHA);

        //Clean-up
        bmp.Dispose();
        ReleaseDC(IntPtr.Zero, screenDc);
        if (hBitmap != IntPtr.Zero) {
          SelectObject(memDc, oldBitmap);
          DeleteObject(hBitmap);
        }
        DeleteDC(memDc);
      }
      catch (Exception) {
      }
    }
  }
}

参考記事

http://www.vcskicks.com/splash-screen.php
著者
Penta
iPentecのメインプログラマー
C#, ASP.NET の開発がメイン、少し前まではDelphiを愛用
掲載日: 2011-02-21

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