I'm new to programming in C# and wanted to ask for a little bit of help. I'm currently trying to move a color-filled rectangle that I draw on a Windows Application form with my left mouse button, and I'm trying to drag-and-drop it to another location using my right mouse button. Currently I've managed to draw the rectangle, but the right click is dragging the entire form along.
Here's my code:
public partial class Form1 : Form
{
private Point MouseDownLocation;
public Form1()
{
InitializeComponent();
this.DoubleBuffered = true;
}
Rectangle rec = new Rectangle(0, 0, 0, 0);
protected override void OnPaint(PaintEventArgs e)
{
e.Graphics.FillRectangle(Brushes.DeepSkyBlue, rec);
}
protected override void OnMouseDown(MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
rec = new Rectangle(e.X, e.Y, 0, 0);
Invalidate();
}
if (e.Button == MouseButtons.Right)
{
MouseDownLocation = e.Location;
}
}
protected override void OnMouseMove(MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
rec.Width = e.X - rec.X;
rec.Height = e.Y - rec.Y;
Invalidate();
}
if (e.Button == MouseButtons.Right)
{
this.Left = e.X + this.Left - MouseDownLocation.X;
this.Top = e.Y + this.Top - MouseDownLocation.Y;
}
}
}
I only need to drag-and-drop the rectangles with right mouse button.
EDIT: Thanks to you all i got my answer very fast and here's the code that works:
public partial class Form1 : Form
{
private Point MouseDownLocation;
public Form1()
{
InitializeComponent();
this.DoubleBuffered = true;
}
Rectangle rec = new Rectangle(0, 0, 0, 0);
protected override void OnPaint(PaintEventArgs e)
{
e.Graphics.FillRectangle(Brushes.DeepSkyBlue, rec);
//Generates the shape
}
protected override void OnMouseDown(MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
//can also use this one:
//if (e.Button == System.Windows.Forms.MouseButtons.Left)
{
rec = new Rectangle(e.X, e.Y, 0, 0);
Invalidate();
}
if (e.Button == MouseButtons.Right)
{
MouseDownLocation = e.Location;
}
}
protected override void OnMouseMove(MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
rec.Width = e.X - rec.X;
rec.Height = e.Y - rec.Y;
this.Invalidate();
}
if (e.Button == MouseButtons.Right)
{
rec.Location = new Point((e.X - MouseDownLocation.X) + rec.Left, (e.Y - MouseDownLocation.Y) + rec.Top);
MouseDownLocation = e.Location;
this.Invalidate();
}
}
}
This seems to work
protected override void OnMouseMove(MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
rec.Width = e.X - rec.X;
rec.Height = e.Y - rec.Y;
this.Invalidate();
}
if (e.Button == MouseButtons.Right)
{
rec.Location = new Point((e.X-MouseDownLocation.X) + rec.Left, (e.Y-MouseDownLocation.Y) + rec.Top);
MouseDownLocation = e.Location;
this.Invalidate();
}
}