ItemDragEventHandler デリゲート
ListView コントロールまたは TreeView コントロールの ItemDrag イベントを処理するメソッドを表します。 名前空間: System.Windows.Forms
アセンブリ: System.Windows.Forms (system.windows.forms.dll 内)
構文
解説
使用例
プラットフォーム
バージョン情報
参照
アセンブリ: System.Windows.Forms (system.windows.forms.dll 内)
構文 パラメータ
解説ItemDragEventHandler デリゲートを作成する場合は、イベントを処理するメソッドを識別してください。イベントをイベント ハンドラに関連付けるには、デリゲートのインスタンスをイベントに追加します。デリゲートを削除しない限り、そのイベントが発生すると常にイベント ハンドラが呼び出されます。イベント ハンドラ デリゲートの詳細については、「イベントとデリゲート」を参照してください。
使用例TreeView コントロール内のドラッグ アンド ドロップ操作を有効にする方法を次の例に示します。この例では、ノードを、そのノードの子孫でない他のノードにドラッグできます。ドラッグしたノードとその子孫ノードはすべて、ドラッグ先ノードの子になります。マウスの左ボタンを使用すると、ドラッグしたノードは目的のノードに移動されます。マウスの右ボタンを使用すると、ドラッグしたノードは目的のノードにコピーされます。
Imports System Imports System.Drawing Imports System.Windows.Forms Public Class Form1 Inherits Form Private treeView1 As TreeView Public Sub New() treeView1 = New TreeView() Me.SuspendLayout() ' Initialize treeView1. treeView1.AllowDrop = True treeView1.Dock = DockStyle.Fill ' Add nodes to treeView1. Dim node As TreeNode Dim x As Integer For x = 0 To 3 ' Add a root node to treeView1. node = treeView1.Nodes.Add(String.Format("Node{0}", x * 4)) Dim y As Integer For y = 1 To 4 ' Add a child node to the previously added node. node = node.Nodes.Add(String.Format("Node{0}", x * 4 + y)) Next y Next x ' Add event handlers for the required drag events. AddHandler treeView1.ItemDrag, AddressOf treeView1_ItemDrag AddHandler treeView1.DragEnter, AddressOf treeView1_DragEnter AddHandler treeView1.DragOver, AddressOf treeView1_DragOver AddHandler treeView1.DragDrop, AddressOf treeView1_DragDrop ' Initialize the form. Me.ClientSize = New Size(292, 273) Me.Controls.Add(treeView1) Me.ResumeLayout(False) End Sub 'New Shared Sub Main() Application.Run(New Form1) End Sub 'Main Private Sub treeView1_ItemDrag(ByVal sender As Object, ByVal e As ItemDragEventArgs) ' Move the dragged node when the left mouse button is used. If e.Button = MouseButtons.Left Then DoDragDrop(e.Item, DragDropEffects.Move) ' Copy the dragged node when the right mouse button is used. ElseIf e.Button = MouseButtons.Right Then DoDragDrop(e.Item, DragDropEffects.Copy) End If End Sub 'treeView1_ItemDrag ' Set the target drop effect to the effect ' specified in the ItemDrag event handler. Private Sub treeView1_DragEnter(ByVal sender As Object, ByVal e As DragEventArgs) e.Effect = e.AllowedEffect End Sub 'treeView1_DragEnter ' Select the node under the mouse pointer to indicate the ' expected drop location. Private Sub treeView1_DragOver(ByVal sender As Object, ByVal e As DragEventArgs) ' Retrieve the client coordinates of the mouse position. Dim targetPoint As Point = treeView1.PointToClient(new Point(e.X, e.Y)) ' Select the node at the mouse position. treeView1.SelectedNode = treeView1.GetNodeAt(targetPoint) End Sub 'treeView1_DragOver Private Sub treeView1_DragDrop(ByVal sender As Object, ByVal e As DragEventArgs) ' Retrieve the client coordinates of the drop location. Dim targetPoint As Point = treeView1.PointToClient(New Point(e.X, e.Y)) ' Retrieve the node at the drop location. Dim targetNode As TreeNode = treeView1.GetNodeAt(targetPoint) ' Retrieve the node that was dragged. Dim draggedNode As TreeNode = CType(e.Data.GetData(GetType(TreeNode)), TreeNode) ' Confirm that the node at the drop location is not ' the dragged node or a descendant of the dragged node. If Not draggedNode.Equals(targetNode) AndAlso Not ContainsNode(draggedNode, targetNode) Then ' If it is a move operation, remove the node from its current ' location and add it to the node at the drop location. If e.Effect = DragDropEffects.Move Then draggedNode.Remove() targetNode.Nodes.Add(draggedNode) ' If it is a copy operation, clone the dragged node ' and add it to the node at the drop location. ElseIf e.Effect = DragDropEffects.Copy Then targetNode.Nodes.Add(CType(draggedNode.Clone(), TreeNode)) End If ' Expand the node at the location ' to show the dropped node. targetNode.Expand() End If End Sub 'treeView1_DragDrop ' Determine whether one node is a parent ' or ancestor of a second node. Private Function ContainsNode(ByVal node1 As TreeNode, ByVal node2 As TreeNode) As Boolean ' Check the parent node of the second node. If node2.Parent Is Nothing Then Return False End If If node2.Parent.Equals(node1) Then Return True End If ' If the parent node is not null or equal to the first node, ' call the ContainsNode method recursively using the parent of ' the second node. Return ContainsNode(node1, node2.Parent) End Function 'ContainsNode End Class 'Form1
using System; using System.Drawing; using System.Windows.Forms; public class Form1 : Form { private TreeView treeView1; public Form1() { treeView1 = new TreeView(); this.SuspendLayout(); // Initialize treeView1. treeView1.AllowDrop = true; treeView1.Dock = DockStyle.Fill; // Add nodes to treeView1. TreeNode node; for (int x = 0; x < 3; ++x) { // Add a root node to treeView1. node = treeView1.Nodes.Add(String.Format("Node{0}", x*4)); for (int y = 1; y < 4; ++y) { // Add a child node to the previously added node. node = node.Nodes.Add(String.Format("Node{0}", x*4 + y)); } } // Add event handlers for the required drag events. treeView1.ItemDrag += new ItemDragEventHandler(treeView1_ItemDrag); treeView1.DragEnter += new DragEventHandler(treeView1_DragEnter); treeView1.DragOver += new DragEventHandler(treeView1_DragOver); treeView1.DragDrop += new DragEventHandler(treeView1_DragDrop); // Initialize the form. this.ClientSize = new Size(292, 273); this.Controls.Add(treeView1); this.ResumeLayout(false); } [STAThread] static void Main() { Application.Run(new Form1()); } private void treeView1_ItemDrag(object sender, ItemDragEventArgs e) { // Move the dragged node when the left mouse button is used. if (e.Button == MouseButtons.Left) { DoDragDrop(e.Item, DragDropEffects.Move); } // Copy the dragged node when the right mouse button is used. else if (e.Button == MouseButtons.Right) { DoDragDrop(e.Item, DragDropEffects.Copy); } } // Set the target drop effect to the effect // specified in the ItemDrag event handler. private void treeView1_DragEnter(object sender, DragEventArgs e) { e.Effect = e.AllowedEffect; } // Select the node under the mouse pointer to indicate the // expected drop location. private void treeView1_DragOver(object sender, DragEventArgs e) { // Retrieve the client coordinates of the mouse position. Point targetPoint = treeView1.PointToClient(new Point(e.X, e.Y)); // Select the node at the mouse position. treeView1.SelectedNode = treeView1.GetNodeAt(targetPoint); } private void treeView1_DragDrop(object sender, DragEventArgs e) { // Retrieve the client coordinates of the drop location. Point targetPoint = treeView1.PointToClient(new Point(e.X, e.Y)); // Retrieve the node at the drop location. TreeNode targetNode = treeView1.GetNodeAt(targetPoint); // Retrieve the node that was dragged. TreeNode draggedNode = (TreeNode)e.Data.GetData(typeof(TreeNode)); // Confirm that the node at the drop location is not // the dragged node or a descendant of the dragged node. if (!draggedNode.Equals(targetNode) && !ContainsNode(draggedNode, targetNode)) { // If it is a move operation, remove the node from its current // location and add it to the node at the drop location. if (e.Effect == DragDropEffects.Move) { draggedNode.Remove(); targetNode.Nodes.Add(draggedNode); } // If it is a copy operation, clone the dragged node // and add it to the node at the drop location. else if (e.Effect == DragDropEffects.Copy) { targetNode.Nodes.Add((TreeNode)draggedNode.Clone()); } // Expand the node at the location // to show the dropped node. targetNode.Expand(); } } // Determine whether one node is a parent // or ancestor of a second node. private bool ContainsNode(TreeNode node1, TreeNode node2) { // Check the parent node of the second node. if (node2.Parent == null) return false; if (node2.Parent.Equals(node1)) return true; // If the parent node is not null or equal to the first node, // call the ContainsNode method recursively using the parent of // the second node. return ContainsNode(node1, node2.Parent); } }
#using <System.dll> #using <System.Windows.Forms.dll> #using <System.Drawing.dll> using namespace System; using namespace System::Drawing; using namespace System::Windows::Forms; public ref class Form1: public Form { private: TreeView^ treeView1; public: Form1() { treeView1 = gcnew TreeView; this->SuspendLayout(); // Initialize treeView1. treeView1->AllowDrop = true; treeView1->Dock = DockStyle::Fill; // Add nodes to treeView1. TreeNode^ node; for ( int x = 0; x < 3; ++x ) { // Add a root node to treeView1. node = treeView1->Nodes->Add( String::Format( "Node{0}", x * 4 ) ); for ( int y = 1; y < 4; ++y ) { // Add a child node to the previously added node. node = node->Nodes->Add( String::Format( "Node{0}", x * 4 + y ) ); } } // Add event handlers for the required drag events. treeView1->ItemDrag += gcnew ItemDragEventHandler( this, &Form1::treeView1_ItemDrag ); treeView1->DragEnter += gcnew DragEventHandler( this, &Form1::treeView1_DragEnter ); treeView1->DragOver += gcnew DragEventHandler( this, &Form1::treeView1_DragOver ); treeView1->DragDrop += gcnew DragEventHandler( this, &Form1::treeView1_DragDrop ); // Initialize the form. this->ClientSize = System::Drawing::Size( 292, 273 ); this->Controls->Add( treeView1 ); this->ResumeLayout( false ); } private: void treeView1_ItemDrag( Object^ /*sender*/, ItemDragEventArgs^ e ) { // Move the dragged node when the left mouse button is used. if ( e->Button == ::MouseButtons::Left ) { DoDragDrop( e->Item, DragDropEffects::Move ); } // Copy the dragged node when the right mouse button is used. else // Copy the dragged node when the right mouse button is used. if ( e->Button == ::MouseButtons::Right ) { DoDragDrop( e->Item, DragDropEffects::Copy ); } } // Set the target drop effect to the effect // specified in the ItemDrag event handler. void treeView1_DragEnter( Object^ /*sender*/, DragEventArgs^ e ) { e->Effect = e->AllowedEffect; } // Select the node under the mouse pointer to indicate the // expected drop location. void treeView1_DragOver( Object^ /*sender*/, DragEventArgs^ e ) { // Retrieve the client coordinates of the mouse position. Point targetPoint = treeView1->PointToClient( Point(e->X,e->Y) ); // Select the node at the mouse position. treeView1->SelectedNode = treeView1->GetNodeAt( targetPoint ); } void treeView1_DragDrop( Object^ /*sender*/, DragEventArgs^ e ) { // Retrieve the client coordinates of the drop location. Point targetPoint = treeView1->PointToClient( Point(e->X,e->Y) ); // Retrieve the node at the drop location. TreeNode^ targetNode = treeView1->GetNodeAt( targetPoint ); // Retrieve the node that was dragged. TreeNode^ draggedNode = dynamic_cast<TreeNode^>(e->Data->GetData( TreeNode::typeid )); // Confirm that the node at the drop location is not // the dragged node or a descendant of the dragged node. if ( !draggedNode->Equals( targetNode ) && !ContainsNode( draggedNode, targetNode ) ) { // If it is a move operation, remove the node from its current // location and add it to the node at the drop location. if ( e->Effect == DragDropEffects::Move ) { draggedNode->Remove(); targetNode->Nodes->Add( draggedNode ); } // If it is a copy operation, clone the dragged node // and add it to the node at the drop location. else // If it is a copy operation, clone the dragged node // and add it to the node at the drop location. if ( e->Effect == DragDropEffects::Copy ) { targetNode->Nodes->Add( dynamic_cast<TreeNode^>(draggedNode->Clone()) ); } // Expand the node at the location // to show the dropped node. targetNode->Expand(); } } // Determine whether one node is a parent // or ancestor of a second node. bool ContainsNode( TreeNode^ node1, TreeNode^ node2 ) { // Check the parent node of the second node. if ( node2->Parent == nullptr ) return false; if ( node2->Parent->Equals( node1 ) ) return true; // If the parent node is not null or equal to the first node, // call the ContainsNode method recursively using the parent of // the second node. return ContainsNode( node1, node2->Parent ); } }; [STAThread] int main() { Application::Run( gcnew Form1 ); }
import System.*; import System.Drawing.*; import System.Windows.Forms.*; public class Form1 extends Form { private TreeView treeView1; public Form1() { treeView1 = new TreeView(); this.SuspendLayout(); // Initialize treeView1. treeView1.set_AllowDrop(true); treeView1.set_Dock(DockStyle.Fill); // Add nodes to treeView1. TreeNode node; for (int x = 0; x < 3; ++x) { // Add a root node to treeView1. node = treeView1.get_Nodes().Add(String. Format("Node{0}", (Int32)(x * 4))); for (int y = 1; y < 4; ++y) { // Add a child node to the previously added node. node = node.get_Nodes().Add(String. Format("Node{0}", (Int32)(x * 4 + y))); } } // Add event handlers for the required drag events. treeView1.add_ItemDrag(new ItemDragEventHandler(treeView1_ItemDrag)); treeView1.add_DragEnter(new DragEventHandler(treeView1_DragEnter)); treeView1.add_DragOver(new DragEventHandler(treeView1_DragOver)); treeView1.add_DragDrop(new DragEventHandler(treeView1_DragDrop)); // Initialize the form. this.set_ClientSize(new Size(292, 273)); this.get_Controls().Add(treeView1); this.ResumeLayout(false); } //Form1 /** @attribute STAThread() */ public static void main(String[] args) { Application.Run(new Form1()); } //main private void treeView1_ItemDrag(Object sender, ItemDragEventArgs e) { // Move the dragged node when the left mouse button is used. if (e.get_Button().Equals(get_MouseButtons().Left)) { DoDragDrop(e.get_Item(), DragDropEffects.Move); } // Copy the dragged node when the right mouse button is used. else { if (e.get_Button().Equals(get_MouseButtons().Right)) { DoDragDrop(e.get_Item(), DragDropEffects.Copy); } } } //treeView1_ItemDrag // Set the target drop effect to the effect // specified in the ItemDrag event handler. private void treeView1_DragEnter(Object sender, DragEventArgs e) { e.set_Effect(e.get_AllowedEffect()); } //treeView1_DragEnter // Select the node under the mouse pointer to indicate the // expected drop location. private void treeView1_DragOver(Object sender, DragEventArgs e) { // Retrieve the client coordinates of the mouse position. Point targetPoint = treeView1.PointToClient(new Point(e.get_X(), e.get_Y())); // Select the node at the mouse position. treeView1.set_SelectedNode(treeView1.GetNodeAt(targetPoint)); } //treeView1_DragOver private void treeView1_DragDrop(Object sender, DragEventArgs e) { // Retrieve the client coordinates of the drop location. Point targetPoint = treeView1.PointToClient(new Point(e.get_X(), e.get_Y())); // Retrieve the node at the drop location. TreeNode targetNode = treeView1.GetNodeAt(targetPoint); // Retrieve the node that was dragged. TreeNode draggedNode = (TreeNode)e.get_Data().GetData(TreeNode.class.ToType()); // Confirm that the node at the drop location is not // the dragged node or a descendant of the dragged node. if (!(draggedNode.Equals(targetNode)) && !(ContainsNode(draggedNode, targetNode))) { // If it is a move operation, remove the node from its current // location and add it to the node at the drop location. if (e.get_Effect().Equals(DragDropEffects.Move)) { draggedNode.Remove(); targetNode.get_Nodes().Add(draggedNode); } // If it is a copy operation, clone the dragged node // and add it to the node at the drop location. else { if (e.get_Effect().Equals(DragDropEffects.Copy)) { targetNode.get_Nodes().Add((TreeNode)draggedNode.Clone()); } } // Expand the node at the location // to show the dropped node. targetNode.Expand(); } } //treeView1_DragDrop // Determine whether one node is a parent // or ancestor of a second node. private boolean ContainsNode(TreeNode node1, TreeNode node2) { // Check the parent node of the second node. if (node2.get_Parent() == null) { return false; } if (node2.get_Parent().Equals(node1)) { return true; } // If the parent node is not null or equal to the first node, // call the ContainsNode method recursively using the parent of // the second node. return ContainsNode(node1, node2.get_Parent()); } //ContainsNode } //Form1
プラットフォームWindows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。
バージョン情報参照- ItemDragEventHandler デリゲートのページへのリンク
