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Form1.cs
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Form1.cs
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using System.Drawing;
using System.Windows.Forms;
using DevExpress.XtraRichEdit.Utils;
using DevExpress.XtraRichEdit.API.Native;
using DevExpress.Office.Utils;
namespace RichListDragDrop {
public partial class Form1 : Form {
private Graphics richEditGraphics = null;
private bool customDragDropTarget = false;
public Form1() {
InitializeComponent();
}
private void listBox1_MouseDown(object sender, MouseEventArgs e) {
if (listBox1.Items.Count == 0)
return;
customDragDropTarget = true;
int index = listBox1.IndexFromPoint(e.X, e.Y);
string item = listBox1.Items[index].ToString();
DragDropEffects dde1 = DoDragDrop(item, DragDropEffects.Copy);
customDragDropTarget = false;
}
private void richEditControl1_DragEnter(object sender, DragEventArgs e) {
if (e.Data.GetDataPresent(DataFormats.StringFormat))
e.Effect = DragDropEffects.Copy;
}
private void richEditControl1_DragOver(object sender, DragEventArgs e) {
if (!customDragDropTarget)
return;
Point docPoint = Units.PixelsToDocuments(richEditControl1.PointToClient(Form.MousePosition),
richEditControl1.DpiX, richEditControl1.DpiY);
DocumentPosition pos = richEditControl1.GetPositionFromPoint(docPoint);
if (pos == null)
return;
Rectangle rect = Units.DocumentsToPixels(richEditControl1.GetBoundsFromPosition(pos),
richEditControl1.DpiX, richEditControl1.DpiY);
richEditControl1.Document.CaretPosition = pos;
if (richEditGraphics == null)
richEditGraphics = richEditControl1.CreateGraphics();
rect.Width = 2;
richEditControl1.Refresh();
richEditGraphics.FillRectangle(Brushes.Blue, rect);
richEditControl1.ScrollToCaret();
}
private void richEditControl1_DragDrop(object sender, DragEventArgs e) {
if (!customDragDropTarget)
return;
string text = (string)e.Data.GetData(DataFormats.StringFormat);
richEditControl1.Document.InsertText(
richEditControl1.Document.CaretPosition, text);
}
}
}