public partial class Form1 : Form
{
bool MouseIsDown = false;
Rectangle MouseRect = Rectangle.Empty;
public Form1()
{
InitializeComponent();
this.MouseDown += new MouseEventHandler(Form1_MouseDown);
this.MouseMove += new MouseEventHandler(Form1_MouseMove);
this.MouseUp += new MouseEventHandler(Form1_MouseUp);
}
void Form1_MouseDown(object sender, MouseEventArgs e)= true;
DrawStart(e.Location);
}
void Form1_MouseMove(object sender, MouseEventArgs e)
{
if (MouseIsDown)
{
ResizeToRectangle(e.Location);
}
//这里可以实现选中啊,但是必须要鼠标在子控件上活动过(鼠标路过子控件)才能选中
//Control ctl = this.GetChildAtPoint(e.Location);
//if (ctl != null)
//{
// ctl.BackColor = Color.Blue;
//}
}
void Form1_MouseUp(object sender, MouseEventArgs e)
{
this.Capture = false;
Cursor.Clip = Rectangle.Empty;
MouseIsDown = false;
DrawRectangle();
MouseRect = Rectangle.Empty;
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void ResizeToRectangle(Point p)
{
DrawRectangle();
MouseRect.Width = p.X - MouseRect.Left;
MouseRect.Height = p.Y - MouseRect.Top;
DrawRectangle();
}
private void DrawStart(Point StartPoint)
{
this.Capture = true;
Cursor.Clip = this.RectangleToScreen(new Rectangle(0, 0, ClientSize.Width, ClientSize.Height));
MouseRect = new Rectangle(StartPoint.X, StartPoint.Y, 0, 0);
}
private void DrawRectangle()
{
Rectangle rect = this.RectangleToScreen(MouseRect);
ControlPaint.DrawReversibleFrame(rect, Color.White, FrameStyle.Dashed);
}
private void Form1_ControlAdded(object sender, ControlEventArgs e)
{
}
}
{
MouseIsDown
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace TestApp
{
public partial class Form2 : Form
{
bool MouseIsDown = false;
Rectangle MouseRect = Rectangle.Empty;
public Form2()
{
InitializeComponent();
this.MouseDown += new MouseEventHandler(frmMain_MouseDown);
this.MouseMove += new MouseEventHandler(frmMain_MouseMove);
this.MouseUp += new MouseEventHandler(frmMain_MouseUp);
}
void frmMain_MouseUp(object sender, MouseEventArgs e)
{
this.Capture = false;
Cursor.Clip = Rectangle.Empty;
MouseIsDown = false;
DrawRectangle();
foreach (Control ct in this.Controls)
{
// Point ctrlCenter = new Point(ct.Location.X + ct.Width / 2, ct.Location.Y + ct.Height / 2);
//if (ctrlCenter.X > MouseRect.Location.X
// && ctrlCenter.X < MouseRect.Location.X + MouseRect.Width
// && ctrlCenter.Y > MouseRect.Location.Y && ctrlCenter.Y > MouseRect.Location.Y + MouseRect.Height)
if (MouseRect.Contains(ct.Location))
{
if (ct is CheckBox)
{
if (((CheckBox)ct).Checked) //值选中
{
((CheckBox)ct).Checked = false;
}
else
{
((CheckBox)ct).Checked = true;
}
//控件选中
}
}
}
MouseRect = Rectangle.Empty;
}
void frmMain_MouseMove(object sender, MouseEventArgs e)
{
if (MouseIsDown)
ResizeToRectangle(e.Location);
}
void frmMain_MouseDown(object sender, MouseEventArgs e)
{
MouseIsDown = true;
DrawStart(e.Location);
}
private void ResizeToRectangle(Point p)
{
DrawRectangle();
MouseRect.Width = p.X - MouseRect.Left;
MouseRect.Height = p.Y - MouseRect.Top;
DrawRectangle();
}
private void DrawRectangle()
{
Rectangle rect = this.RectangleToScreen(MouseRect);
ControlPaint.DrawReversibleFrame(rect, Color.White, FrameStyle.Dashed);
}
private void DrawStart(Point StartPoint)
{
this.Capture = true;
Cursor.Clip = this.RectangleToScreen(new Rectangle(0, 0, ClientSize.Width, ClientSize.Height));
MouseRect = new Rectangle(StartPoint.X, StartPoint.Y, 0, 0);
}
}
}