■ 마우스 드래그 대상 이미지를 표시하는 방법을 보여준다.
▶ MainForm.cs
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using System; using System.Drawing; using System.Drawing.Drawing2D; using System.Runtime.InteropServices; using System.Windows.Forms; namespace TestProject { /// <summary> /// 메인 폼 /// </summary> public partial class MainForm : Form { //////////////////////////////////////////////////////////////////////////////////////////////////// Import ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Private #region 디바이스 컨텍스트 생성하기 - CreateDC(driverName, deviceName, port, initialDataHandle) /// <summary> /// 디바이스 컨텍스트 생성하기 /// </summary> /// <param name="driverName">드라이버명</param> /// <param name="deviceName">장치명</param> /// <param name="port">포트</param> /// <param name="initialDataHandle">초기 데이터 핸들</param> /// <returns>디바이스 컨텍스트 핸들</returns> [DllImport("gdi32")] private static extern IntPtr CreateDC(string driverName, string deviceName, string port, IntPtr initialDataHandle); #endregion #region 디바이스 컨텍스트 삭제하기 - DeleteDC(deviceContextHandle) /// <summary> /// 디바이스 컨텍스트 삭제하기 /// </summary> /// <param name="deviceContextHandle">디바이스 컨텍스트 핸들</param> /// <returns>처리 결과</returns> [DllImport("gdi32")] private static extern bool DeleteDC(IntPtr deviceContextHandle); #endregion #region 클라이언트 좌표에서 화면 좌표 구하기 - ClientToScreen(windowHandle, screenPoint) /// <summary> /// 클라이언트 좌표에서 화면 좌표 구하기 /// </summary> /// <param name="windowHandle">윈도우 핸들</param> /// <param name="screenPoint">화면 좌표계 포인트</param> /// <returns>처리 결과</returns> [DllImport("user32")] private static extern bool ClientToScreen(IntPtr windowHandle, ref Point screenPoint); #endregion #region 비트맵 복사하기 - BitBlt(targetDeviceContextHandle, targetX, targetY, width, height, sourceDeviceContextHandle, sourceX, sourceY, rasterOperationCode /// <summary> /// 비트맵 복사하기 /// </summary> /// <param name="targetDeviceContextHandle">타겟 디바이스 컨텍스트 핸들</param> /// <param name="targetX">타겟 X</param> /// <param name="targetY">타겟 Y</param> /// <param name="width">너비</param> /// <param name="height">높이</param> /// <param name="sourceDeviceContextHandle">소스 디바이스 컨텍스트 핸들</param> /// <param name="sourceX">소스 X</param> /// <param name="sourceY">소스 Y</param> /// <param name="rasterOperationCode">래스터 연산 코드</param> /// <returns>처리 결과</returns> [DllImport("gdi32")] private static extern bool BitBlt ( IntPtr targetDeviceContextHandle, int targetX, int targetY, int width, int height, IntPtr sourceDeviceContextHandle, int sourceX, int sourceY, int rasterOperationCode ); #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// SRCCOPY /// </summary> private const int SRCCOPY = 0xcc0020; /// <summary> /// 드래그 문자열 /// </summary> private string dragString; /// <summary> /// 드래그 문자열 포인트 /// </summary> private Point dragStringPoint; /// <summary> /// 드래그 문자열 폰트 /// </summary> private Font dragStringFont; /// <summary> /// 드래그 이미지 크기 /// </summary> private Size dragImageSize; /// <summary> /// 마우스 DOWN 여부 /// </summary> private bool mouseDown = false; /// <summary> /// 마우스 델타 포인트 /// </summary> private Point mouseDeltaPoint; /// <summary> /// 전체 화면 디바이스 컨텍스트 핸들 /// </summary> private IntPtr displayDeviceContextHandle; /// <summary> /// 전체 화면 그래픽스 /// </summary> private Graphics displayGraphics; /// <summary> /// 백업 저장소 비트맵 /// </summary> private Bitmap backingStoreBitmap; /// <summary> /// 백업 저장소 그래픽스 /// </summary> private Graphics backingStoreGraphics; /// <summary> /// 백업 저장소 디바이스 컨텍스트 핸들 /// </summary> private IntPtr backingStoreDeviceContextHandle; /// <summary> /// 백업 저장소 포인트 /// </summary> private Point backingStorePoint; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - MainForm() /// <summary> /// 생성자 /// </summary> public MainForm() { InitializeComponent(); this.dragString = "Drag Me!"; this.dragStringPoint = new Point(100, 100); this.dragStringFont = new Font("Times New Roman", 14, FontStyle.Bold); Load += Form_Load; MouseDown += Form_MouseDown; MouseMove += Form_MouseMove; MouseUp += Form_MouseUp; Paint += Form_Paint; } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Private //////////////////////////////////////////////////////////////////////////////// Event #region 폼 로드시 처리하기 - Form_Load(sender, e) /// <summary> /// 폼 로드시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void Form_Load(object sender, EventArgs e) { Graphics graphics = CreateGraphics(); SizeF dragStringSize = graphics.MeasureString(this.dragString, this.dragStringFont); this.dragImageSize = new Size((int)dragStringSize.Width, (int)dragStringSize.Height); graphics.Dispose(); } #endregion #region 폼 마우스 DOWN 처리하기 - Form_MouseDown(sender, e) /// <summary> /// 폼 마우스 DOWN 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void Form_MouseDown(object sender, MouseEventArgs e) { Rectangle dragStringRectangle = new Rectangle ( this.dragStringPoint, new Size(this.dragImageSize.Width, this.dragImageSize.Height) ); if(dragStringRectangle.Contains(e.Location)) { this.mouseDown = true; this.mouseDeltaPoint = new Point(e.X - this.dragStringPoint.X, e.Y - this.dragStringPoint.Y); Point screenPoint = GetScreenPoint(e.X, e.Y); screenPoint.X -= this.mouseDeltaPoint.X; screenPoint.Y -= this.mouseDeltaPoint.Y; SetDisplayGraphics(); this.backingStoreBitmap = new Bitmap(this.dragImageSize.Width, this.dragImageSize.Height); this.backingStoreGraphics = Graphics.FromImage(backingStoreBitmap); this.backingStoreDeviceContextHandle = this.backingStoreGraphics.GetHdc(); BitBlt ( this.backingStoreDeviceContextHandle, 0, 0, this.backingStoreBitmap.Width, this.backingStoreBitmap.Height, this.displayDeviceContextHandle, screenPoint.X, screenPoint.Y, SRCCOPY ); this.backingStorePoint = new Point(screenPoint.X, screenPoint.Y); DrawDragImage(this.displayGraphics, true, screenPoint.X, screenPoint.Y, dragString); } } #endregion #region 폼 마우스 이동시 처리하기 - Form_MouseMove(sender, e) /// <summary> /// 폼 마우스 이동시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void Form_MouseMove(object sender, MouseEventArgs e) { if(this.mouseDown) { Point screenPoint = GetScreenPoint(e.X, e.Y); screenPoint.X -= this.mouseDeltaPoint.X; screenPoint.Y -= this.mouseDeltaPoint.Y; BitBlt ( this.displayDeviceContextHandle, this.backingStorePoint.X, this.backingStorePoint.Y, this.backingStoreBitmap.Width, this.backingStoreBitmap.Height, this.backingStoreDeviceContextHandle, 0, 0, SRCCOPY ); BitBlt ( this.backingStoreDeviceContextHandle, 0, 0, this.backingStoreBitmap.Width, this.backingStoreBitmap.Height, this.displayDeviceContextHandle, screenPoint.X, screenPoint.Y, SRCCOPY ); this.backingStorePoint = new Point(screenPoint.X, screenPoint.Y); DrawDragImage(this.displayGraphics, true, screenPoint.X, screenPoint.Y, this.dragString); } } #endregion #region 폼 마우스 UP 처리하기 - Form_MouseUp(sender, e) /// <summary> /// 폼 마우스 UP 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void Form_MouseUp(object sender, MouseEventArgs e) { if(this.mouseDown) { this.mouseDown = false; BitBlt ( this.displayDeviceContextHandle, this.backingStorePoint.X, this.backingStorePoint.Y, this.backingStoreBitmap.Width, this.backingStoreBitmap.Height, this.backingStoreDeviceContextHandle, 0, 0, SRCCOPY ); DisposeDisplayDeviceContext(); this.backingStoreGraphics.ReleaseHdc(this.backingStoreDeviceContextHandle); this.backingStoreGraphics.Dispose(); this.backingStoreBitmap.Dispose(); this.backingStoreBitmap = null; } } #endregion #region 폼 페인트시 처리하기 - Form_Paint(sender, e) /// <summary> /// 폼 페인트시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void Form_Paint(object sender, PaintEventArgs e) { Graphics graphics = e.Graphics; graphics.FillRectangle(Brushes.Bisque, ClientRectangle); Font font = new Font("Times New Roman", 32); graphics.DrawString("Hello, World!", font, Brushes.Blue, 10, 10); font.Dispose(); DrawDragImage(graphics, false, this.dragStringPoint.X, this.dragStringPoint.X, this.dragString); } #endregion //////////////////////////////////////////////////////////////////////////////// Function #region 화면 포인트 구하기 - GetScreenPoint(x, y) /// <summary> /// 화면 포인트 구하기 /// </summary> /// <param name="x">X</param> /// <param name="y">Y</param> /// <returns>화면 포인트</returns> private Point GetScreenPoint(int x, int y) { Point screenPoint = new Point(x, y); ClientToScreen(Handle, ref screenPoint); return screenPoint; } #endregion #region 전체 화면 그래픽스 설정하기 - SetDisplayGraphics() /// <summary> /// 전체 화면 그래픽스 설정하기 /// </summary> private void SetDisplayGraphics() { this.displayDeviceContextHandle = CreateDC("DISPLAY", null, null, (IntPtr)null); this.displayGraphics = Graphics.FromHdc(this.displayDeviceContextHandle); } #endregion #region 드래그 이미지 그리기 - DrawDragImage(graphics, alphaBlending, x, y, text) /// <summary> /// 드래그 이미지 그리기 /// </summary> /// <param name="graphics">그래픽스</param> /// <param name="alphaBlending">알파 블렌딩 적용 여부</param> /// <param name="x">X</param> /// <param name="y">Y</param> /// <param name="text">텍스트</param> private void DrawDragImage(Graphics graphics, bool alphaBlending, int x, int y, string text) { Rectangle rectangle = new Rectangle(x, y, this.dragImageSize.Width, this.dragImageSize.Height); if(alphaBlending) { Color color1 = Color.FromArgb(0 , Color.Red); Color color2 = Color.FromArgb(80, Color.Red); Rectangle rectangle1 = new Rectangle ( rectangle.Left, rectangle.Top, rectangle.Width / 2, rectangle.Height ); Rectangle rectangle2 = new Rectangle ( rectangle.Left + rectangle.Width / 2, rectangle.Top, rectangle.Width / 2, rectangle.Height ); LinearGradientBrush brush1 = new LinearGradientBrush(rectangle1, color1, color2, 0f); LinearGradientBrush brush2 = new LinearGradientBrush(rectangle2, color2, color1, 0f); graphics.FillRectangle ( brush1, new Rectangle ( rectangle1.Left + 1, rectangle1.Top, rectangle1.Width + 1, rectangle1.Height ) ); graphics.FillRectangle(brush2, rectangle2); brush1.Dispose(); brush2.Dispose(); } else { graphics.FillRectangle(Brushes.Red, rectangle); } Color textColor; if(alphaBlending) { textColor = Color.FromArgb(80, Color.Black); } else { textColor = Color.Black; } Brush textBrush = new SolidBrush(textColor); graphics.DrawString(text, this.dragStringFont, textBrush, rectangle); textBrush.Dispose(); } #endregion #region 전체 화면 디바이스 컨텍스트 리소스 해제하기 - DisposeDisplayDeviceContext() /// <summary> /// 전체 화면 디바이스 컨텍스트 리소스 해제하기 /// </summary> private void DisposeDisplayDeviceContext() { this.displayGraphics.Dispose(); DeleteDC(this.displayDeviceContextHandle); } #endregion } } |
