SftTree/DLL 7.5 - Tree Control
SftBox/OCX 5.0 - Combo Box Control
SftButton/OCX 3.0 - Button Control
SftMask/OCX 7.0 - Masked Edit Control
SftTabs/OCX 6.5 - Tab Control (VB6 only)
SftTree/OCX 7.5 - Tree Control
SftPrintPreview/DLL 2.0 - Print Preview Control (discontinued)
SftTree/DLL 7.5 - Tree Control
SftBox/OCX 5.0 - Combo Box Control
SftButton/OCX 3.0 - Button Control
SftDirectory 3.5 - File/Folder Control (discontinued)
SftMask/OCX 7.0 - Masked Edit Control
SftOptions 1.0 - Registry/INI Control (discontinued)
SftPrintPreview/OCX 1.0 - Print Preview Control (discontinued)
SftTabs/OCX 6.5 - Tab Control (VB6 only)
SftTree/OCX 7.5 - Tree Control
SftTabs/NET 6.0 - Tab Control (discontinued)
SftTree/NET 2.0 - Tree Control
This sample demonstrates drag & drop within the tree control, dragging data to a textbox and dropping data on the tree control from File Explorer.
using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.Diagnostics; using System.Reflection; using Softelvdm.SftTreeNET; using Softelvdm.Controls; namespace WindowsApplication1 { public partial class DragDropSample1 : Form { public DragDropSample1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { // This sample demonstrates drag & drop using one textbox control. // To prepare for this sample, create a new project with a blank form and add // a SftTree/NET control named sftTree1. // In addition, a textbox named textbox1 is needed. Try dragging data from the // tree control to the text box. // It is also possible to drag files from Windows Explorer to the tree control. // No files are moved/copied, merely their names are added to the tree control. sftTree1.Initializing = true; sftTree1.Columns.Count = 1; for (int i = 0 ; i < 10 ; ++i) { ItemClass item = sftTree1.ItemCollection.Add("Item " + i.ToString()); for (int ic = 0 ; ic < 10 ; ++ic) { ItemClass child = item.Add("Child item " + ic.ToString()); } } sftTree1.ItemCollection.Collapse(CollapseStyleEnum.All); sftTree1.Columns.MakeOptimal(0, false); sftTree1.RecalcHorizontalExtent(); // We need to set up the tree control as a drop target sftTree1.AllowDrop = true; sftTree1.AutoExpandDragDrop = true; sftTree1.AutoExpandArea = AutoExpandAreaEnum.AllColumns; sftTree1.Initializing = false; // We also need to set up the text box so we can drop data textBox1.AllowDrop = true; } private void sftTree1_DragDetected(object sender, DragDetectedEventArgs e) { Debug.Print("We're starting to drag something"); DumpValues(e); // based on what we are dragging, make up a string string s = ""; s = e.Area.ToString() + " in "; s += e.Item.UsageLocation.ToString() + ": "; if (e.Cell != null) { if (e.Cell.Text == "") s += "(empty cell) "; else s += e.Cell.Text + " "; } else if (e.RowHeader != null) { if (e.RowHeader.Text == "") s += "(empty row header) "; else s += e.RowHeader.Text + " "; } else if (e.Item != null) { s += " an item "; } e.Handled = true; sftTree1.DoDragDrop(s, DragDropEffects.Copy); } // The textbox just copies data in this example private void textBox1_DragEnter(object sender, DragEventArgs e) { Debug.Write("*** textBox1 DragEnter "); DumpValues(e); if (e.Data.GetDataPresent(DataFormats.UnicodeText)) e.Effect = DragDropEffects.Copy; } private void textBox1_DragDrop(object sender, DragEventArgs e) { Debug.Write("*** textBox1 DragDrop "); DumpValues(e); if (e.Data.GetDataPresent(DataFormats.UnicodeText)) textBox1.Text = (string)e.Data.GetData("System.String"); } // The tree control also just copies the data private void sftTree1_DragEnter(object sender, DragEventArgs e) { Debug.Write("*** sftTree1 DragEnter "); DumpValues(e); if (e.Data.GetDataPresent(DataFormats.UnicodeText)) e.Effect = DragDropEffects.Copy; else if (e.Data.GetDataPresent(DataFormats.FileDrop)) e.Effect = DragDropEffects.Copy; else e.Effect = DragDropEffects.None; } private void sftTree1_DragOver(object sender, DragEventArgs e) { // in this example, if we don't have a valid drop target, // we STILL allow drops if (sftTree1.DropTarget == null) e.Effect = DragDropEffects.Copy; } private void sftTree1_DragDrop(object sender, DragEventArgs e) { Debug.Write("*** sftTree1 DragDrop "); DumpValues(e); ItemClass item = sftTree1.DropTarget as ItemClass; string s = ""; Array a = null; if (e.Data.GetDataPresent(DataFormats.UnicodeText)) s = (string)e.Data.GetData("System.String"); else if (e.Data.GetDataPresent(DataFormats.FileDrop)) a = (Array)e.Data.GetData(DataFormats.FileDrop); else return; ItemClass newItem = null; sftTree1.Initializing = true; if (s.Length > 0) { if (item != null) { newItem = item.Add(s); item.Expand(ExpandStyleEnum.DirectOnly); } else newItem = sftTree1.ItemCollection.Add(s); } else { foreach (object o in a) { s = (string) o; if (item != null) { newItem = item.Add(s); item.Expand(ExpandStyleEnum.DirectOnly); } else newItem = sftTree1.ItemCollection.Add(s); } } sftTree1.Columns.MakeOptimal(0, false); sftTree1.RecalcHorizontalExtent(); newItem.ScrollIntoView(); sftTree1.FocusObject = newItem; newItem.Selected = true; sftTree1.Initializing = false; } // This is a small helper routine to show all properties and fields of an object private void DumpValues(object o) { PropertyInfo[] api = o.GetType().GetProperties(); foreach (PropertyInfo pi in api) Debug.Write(" " + pi.Name + " " + pi.GetValue(o, new object[] )); FieldInfo[] afi = o.GetType().GetFields(); foreach (FieldInfo fi in afi) Debug.Write(" " + fi.Name + " " + fi.GetValue(o)); Debug.WriteLine(""); } } }