C#Winform 드래그 앤 드롭 이벤트와 클릭 이벤트가 겹칠 때 Drag and drop & Click event Conflict

출처 : http://stackoverflow.com/questions/17264910/c-sharp-drag-n-drop-start-drag-operation-in-mouse-down-conflicts-with-click#17293434

private bool DraggingFromGrid = false;

private System.Drawing.Point DraggingStartPoint = new System.Drawing.Point();

 

void GridControlBrowser_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)

{

    if (e.Button == System.Windows.Forms.MouseButtons.Left)

    {

        DraggingFromGrid = true;

        DraggingStartPoint = new System.Drawing.Point(e.X, e.Y);

    }

}

 

void GridControlBrowser_MouseUp(object sender, MouseEventArgs e)

{

    if (DraggingFromGrid)

    {

        DraggingFromGrid = false;

    }

}

 

void GridControlBrowser_MouseMove(object sender, MouseEventArgs e)

{

    if (DraggingFromGrid)

    {

        if (System.Math.Abs(e.X - DraggingStartPoint.X) > 10 ||

            System.Math.Abs(e.Y - DraggingStartPoint.Y) > 10)

        {

            StartDragging();

        }

    }

}

 

private void StartDragging()

{

    DraggingFromGrid = false;

 

    // create files

    var _criteria = this.GetSelectionFromGrid();

    var _files = new List<string>();

 

... retrieve filenames and store in _files List ...

 

var _data = new DataObject(DataFormats.FileDrop, _files.ToArray());

 

    DoDragDrop(_data, DragDropEffects.Copy);

}