Fake Drag And Drop
/*
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.ComponentModel;
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.ComponentModel.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;
}
}
}
}
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