Csharp/C Sharp/GUI Windows Form/Drag Drop
Содержание
Drag and drop image to another window
<source lang="csharp"> using System; using System.Collections.Generic; using System.ruponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; public class Palette : Form {
private System.Windows.Forms.Label lblPictureThree;
private System.Windows.Forms.Label lblPictureTwo;
private System.Windows.Forms.Label lblPictureOne;
public Palette() {
InitializeComponent();
}
private void lbl_MouseDown(object sender, MouseEventArgs e)
{
Label lbl = (Label)sender;
lbl.DoDragDrop(lbl.Image, DragDropEffects.Copy);
}
private void InitializeComponent()
{
this.lblPictureThree = new System.Windows.Forms.Label();
this.lblPictureTwo = new System.Windows.Forms.Label();
this.lblPictureOne = new System.Windows.Forms.Label();
this.SuspendLayout();
//
// lblPictureThree
//
this.lblPictureThree.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
this.lblPictureThree.Image = new Bitmap("winter.jpg");
this.lblPictureThree.Location = new System.Drawing.Point(12, 113);
this.lblPictureThree.Name = "lblPictureThree";
this.lblPictureThree.Size = new System.Drawing.Size(56, 48);
this.lblPictureThree.TabIndex = 6;
this.lblPictureThree.MouseDown += new System.Windows.Forms.MouseEventHandler(this.lbl_MouseDown);
//
// lblPictureTwo
//
this.lblPictureTwo.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
this.lblPictureTwo.Image = new Bitmap("winter.jpg");
this.lblPictureTwo.Location = new System.Drawing.Point(12, 61);
this.lblPictureTwo.Name = "lblPictureTwo";
this.lblPictureTwo.Size = new System.Drawing.Size(56, 48);
this.lblPictureTwo.TabIndex = 5;
this.lblPictureTwo.MouseDown += new System.Windows.Forms.MouseEventHandler(this.lbl_MouseDown);
//
// lblPictureOne
//
this.lblPictureOne.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
this.lblPictureOne.Image = new Bitmap("winter.jpg");
this.lblPictureOne.Location = new System.Drawing.Point(12, 9);
this.lblPictureOne.Name = "lblPictureOne";
this.lblPictureOne.Size = new System.Drawing.Size(56, 48);
this.lblPictureOne.TabIndex = 4;
this.lblPictureOne.MouseDown += new System.Windows.Forms.MouseEventHandler(this.lbl_MouseDown);
//
// Palette
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(83, 173);
this.Controls.Add(this.lblPictureTwo);
this.Controls.Add(this.lblPictureOne);
this.Controls.Add(this.lblPictureThree);
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedToolWindow;
this.Name = "Palette";
this.ShowInTaskbar = false;
this.Text = "Palette";
this.ResumeLayout(false);
}
[STAThread]
static void Main()
{
Application.Run(new DrawingArea());
}
}
public class DrawingArea : Form
{
private System.Windows.Forms.PictureBox picDrawingArea;
public DrawingArea()
{
InitializeComponent();
}
private void DrawingArea_Load(object sender, EventArgs e)
{
Palette frmTool = new Palette();
this.AddOwnedForm(frmTool);
frmTool.Show();
picDrawingArea.AllowDrop = true;
}
private void picDrawingArea_DragEnter(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent(DataFormats.Bitmap))
{
e.Effect = DragDropEffects.Copy;
}
else
{
e.Effect = DragDropEffects.None;
}
}
private void picDrawingArea_DragDrop(object sender, DragEventArgs e)
{
Graphics g = picDrawingArea.CreateGraphics();
g.DrawImage((Image)e.Data.GetData(DataFormats.Bitmap),
new Point(e.X - this.Left, e.Y - this.Top));
}
private void InitializeComponent()
{
this.picDrawingArea = new System.Windows.Forms.PictureBox();
((System.ruponentModel.ISupportInitialize)(this.picDrawingArea)).BeginInit();
this.SuspendLayout();
//
// picDrawingArea
//
this.picDrawingArea.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
| System.Windows.Forms.AnchorStyles.Left)
| System.Windows.Forms.AnchorStyles.Right)));
this.picDrawingArea.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
this.picDrawingArea.Location = new System.Drawing.Point(1, 2);
this.picDrawingArea.Name = "picDrawingArea";
this.picDrawingArea.Size = new System.Drawing.Size(377, 270);
this.picDrawingArea.TabIndex = 2;
this.picDrawingArea.TabStop = false;
this.picDrawingArea.DragDrop += new System.Windows.Forms.DragEventHandler(this.picDrawingArea_DragDrop);
this.picDrawingArea.DragEnter += new System.Windows.Forms.DragEventHandler(this.picDrawingArea_DragEnter);
//
// DrawingArea
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(379, 274);
this.Controls.Add(this.picDrawingArea);
this.Name = "DrawingArea";
this.Text = "Drawing Area";
this.Load += new System.EventHandler(this.DrawingArea_Load);
((System.ruponentModel.ISupportInitialize)(this.picDrawingArea)).EndInit();
this.ResumeLayout(false);
}
}
</source>
Drag and drop inside a container
<source lang="csharp"> using System; using System.Drawing; using System.Collections; using System.ruponentModel; using System.Windows.Forms; using System.Data; public class Form1 : System.Windows.Forms.Form {
internal System.Windows.Forms.Label lblDragger;
public Form1()
{
InitializeComponent();
}
private void InitializeComponent()
{
this.lblDragger = new System.Windows.Forms.Label();
this.SuspendLayout();
//
// lblDragger
//
this.lblDragger.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
this.lblDragger.Image = new Bitmap("winter.jpg");
this.lblDragger.Location = new System.Drawing.Point(110, 105);
this.lblDragger.Name = "lblDragger";
this.lblDragger.Size = new System.Drawing.Size(72, 56);
this.lblDragger.TabIndex = 2;
this.lblDragger.MouseUp += new System.Windows.Forms.MouseEventHandler(this.lblDragger_MouseUp);
this.lblDragger.MouseMove += new System.Windows.Forms.MouseEventHandler(this.lblDragger_MouseMove);
this.lblDragger.MouseDown += new System.Windows.Forms.MouseEventHandler(this.lblDragger_MouseDown);
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(292, 266);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.lblDragger});
this.Name = "Form1";
this.Text = "Fake Drag And Drop";
this.ResumeLayout(false);
}
[STAThread]
static void Main()
{
Application.Run(new Form1());
}
private bool isDragging = false;
private int clickOffsetX, clickOffsetY;
private void lblDragger_MouseDown(System.Object sender, System.Windows.Forms.MouseEventArgs e)
{
isDragging = true;
clickOffsetX = e.X;
clickOffsetY = e.Y;
}
private void lblDragger_MouseUp(System.Object sender, System.Windows.Forms.MouseEventArgs e)
{
isDragging = false;
}
private void lblDragger_MouseMove(System.Object sender,
System.Windows.Forms.MouseEventArgs e)
{
if (isDragging == true)
{
lblDragger.Left = e.X + lblDragger.Left - clickOffsetX;
lblDragger.Top = e.Y + lblDragger.Top - clickOffsetY;
}
}
}
</source>
Drag and drop the PictureBox
<source lang="csharp">
using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
public class Form1 : System.Windows.Forms.Form
{
private bool isDragging = false;
private int currentX, currentY;
Rectangle dropRect = new Rectangle(180, 180, 60, 60);
private PictureBox myPictureBox;
public Form1()
{
InitializeComponent();
CenterToScreen();
myPictureBox = new PictureBox();
myPictureBox.SizeMode = PictureBoxSizeMode.StretchImage;
myPictureBox.Location = new System.Drawing.Point(64, 32);
myPictureBox.Size = new System.Drawing.Size(50, 50);
myPictureBox.Image = new Bitmap("winter.jpg");
myPictureBox.MouseDown += new MouseEventHandler(myPictureBox_MouseDown);
myPictureBox.MouseUp += new MouseEventHandler(myPictureBox_MouseUp);
myPictureBox.MouseMove += new MouseEventHandler(myPictureBox_MouseMove);
myPictureBox.Cursor = Cursors.Hand;
Controls.Add(myPictureBox);
}
private void InitializeComponent()
{
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(292, 273);
this.Text = "Dragging Images";
this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form1_Paint);
}
static void Main()
{
Application.Run(new Form1());
}
private void myPictureBox_MouseDown(object sender, MouseEventArgs e)
{
isDragging = true;
currentX = e.X;
currentY = e.Y;
}
private void myPictureBox_MouseMove(object sender, MouseEventArgs e) {
if (isDragging) {
myPictureBox.Top = myPictureBox.Top + (e.Y - currentY);
myPictureBox.Left = myPictureBox.Left + (e.X - currentX);
}
}
private void myPictureBox_MouseUp(object sender, MouseEventArgs e)
{
isDragging = false;
Console.WriteLine(dropRect.Contains(myPictureBox.Bounds));
}
private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
{
Graphics g = e.Graphics;
g.FillRectangle(Brushes.AntiqueWhite, dropRect);
g.DrawString("Drag and drop the image here.", new Font("Times New Roman", 8), Brushes.Red, dropRect);
}
}
</source>
Fake Drag And Drop
<source lang="csharp"> /* User Interfaces in C#: Windows Forms and Custom Controls by Matthew MacDonald Publisher: Apress ISBN: 1590590457
- /
using System; using System.Drawing; using System.Collections; using System.ruponentModel; using System.Windows.Forms; using System.Data; namespace FakeDragAndDrop {
/// <summary>
/// Summary description for FakeDragAndDrop.
/// </summary>
public class FakeDragAndDrop : System.Windows.Forms.Form
{
internal System.Windows.Forms.Label lblDragger;
/// <summary>
/// Required designer variable.
/// </summary>
private System.ruponentModel.Container components = null;
public FakeDragAndDrop()
{
//
// Required for Windows Form Designer support
//
InitializeComponent();
//
// TODO: Add any constructor code after InitializeComponent call
//
}
/// <summary>
/// Clean up any resources being used.
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(FakeDragAndDrop));
this.lblDragger = new System.Windows.Forms.Label();
this.SuspendLayout();
//
// lblDragger
//
this.lblDragger.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
this.lblDragger.Image = ((System.Drawing.Bitmap)(resources.GetObject("lblDragger.Image")));
this.lblDragger.Location = new System.Drawing.Point(110, 105);
this.lblDragger.Name = "lblDragger";
this.lblDragger.Size = new System.Drawing.Size(72, 56);
this.lblDragger.TabIndex = 2;
this.lblDragger.MouseUp += new System.Windows.Forms.MouseEventHandler(this.lblDragger_MouseUp);
this.lblDragger.MouseMove += new System.Windows.Forms.MouseEventHandler(this.lblDragger_MouseMove);
this.lblDragger.MouseDown += new System.Windows.Forms.MouseEventHandler(this.lblDragger_MouseDown);
//
// FakeDragAndDrop
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(292, 266);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.lblDragger});
this.Name = "FakeDragAndDrop";
this.Text = "Fake Drag And Drop";
this.ResumeLayout(false);
}
#endregion
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new FakeDragAndDrop());
}
// Keep track of when fake "drag and drop" mode is enabled.
private bool isDragging = false;
// Store the location where the user clicked the control.
private int clickOffsetX, clickOffsetY;
// Start dragging.
private void lblDragger_MouseDown(System.Object sender,
System.Windows.Forms.MouseEventArgs e)
{
isDragging = true;
clickOffsetX = e.X;
clickOffsetY = e.Y;
}
// End dragging.
private void lblDragger_MouseUp(System.Object sender,
System.Windows.Forms.MouseEventArgs e)
{
isDragging = false;
}
// Move the control (during dragging).
private void lblDragger_MouseMove(System.Object sender,
System.Windows.Forms.MouseEventArgs e)
{
if (isDragging == true)
{
// The control coordinates are converted into form coordinates
// by adding the label position offset.
// The offset where the user clicked in the control is also
// accounted for. Otherwise, it looks like the top-left corner
// of the label is attached to the mouse.
lblDragger.Left = e.X + lblDragger.Left - clickOffsetX;
lblDragger.Top = e.Y + lblDragger.Top - clickOffsetY;
}
}
}
}
</source>
<A href="http://www.nfex.ru/Code/CSharpDownload/FakeDragAndDrop.zip">FakeDragAndDrop.zip( 23 k)</a>
Image Drop
<source lang="csharp"> using System; using System.Drawing; using System.Drawing.Imaging; using System.IO; using System.Windows.Forms; class ImageDrop : Form {
bool bIsTarget;
Image image;
public static void Main() {
Application.Run(new ImageDrop());
}
public ImageDrop() {
AllowDrop = true;
}
protected override void OnDragOver(DragEventArgs dea) {
if (dea.Data.GetDataPresent(DataFormats.FileDrop) || dea.Data.GetDataPresent(typeof(Metafile)) || dea.Data.GetDataPresent(typeof(Bitmap))) {
if ((dea.AllowedEffect & DragDropEffects.Move) != 0)
dea.Effect = DragDropEffects.Move;
if (((dea.AllowedEffect & DragDropEffects.Copy) != 0) && ((dea.KeyState & 0x08) != 0)) // Ctrl key
dea.Effect = DragDropEffects.Copy;
}
}
protected override void OnDragDrop(DragEventArgs dea) {
if (dea.Data.GetDataPresent(DataFormats.FileDrop)) {
string[] astr = (string[])dea.Data.GetData(DataFormats.FileDrop);
image = Image.FromFile(astr[0]);
Invalidate();
} else {
if (dea.Data.GetDataPresent(typeof(Metafile)))
image = (Image)dea.Data.GetData(typeof(Metafile));
else if (dea.Data.GetDataPresent(typeof(Bitmap)))
image = (Image)dea.Data.GetData(typeof(Bitmap));
bIsTarget = true;
Invalidate();
}
}
protected override void OnMouseDown(MouseEventArgs mea) {
if (image != null) {
bIsTarget = false;
DragDropEffects dde = DoDragDrop(image,DragDropEffects.Copy | DragDropEffects.Move);
if (dde == DragDropEffects.Move && !bIsTarget)
image = null;
}
}
}
</source>
