实例介绍
【实例简介】
C#图片浏览(支持鼠标拖动与滚轮缩放)
【实例截图】
【核心代码】
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace PicView
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void panel1_MouseEnter(object sender, EventArgs e)
{
pictureBox1.Focus();
}
private void panel1_MouseLeave(object sender, EventArgs e)
{
if (IsMouseInPanel())
{
if (timer1 != null)
{
timer1.Dispose();
}
InitialTimer1();
}
else
{
this.label1.Focus();
this.toolStrip1.Visible = false;
}
}
private void max()
{
int w = pictureBox1.Image.Width;
int h = pictureBox1.Image.Height;
double div = Convert.ToDouble(h) / Convert.ToDouble(w);
if (w < 1100 && h < 790)
{
w = w 30;
h = Convert.ToInt32(w * div);
this.pictureBox1.Left -= 15;
this.pictureBox1.Top -= (h - pictureBox1.Image.Height) / 2;
}
Bitmap NewBitmap = new Bitmap(this.pictureBox1.InitialImage, w, h);
this.pictureBox1.Image = NewBitmap;
}
private void min()
{
int w = pictureBox1.Image.Width;
int h = pictureBox1.Image.Height;
double div = Convert.ToDouble(h) / Convert.ToDouble(w);
if (w > 30 && (w - 30) * div > 1)
{
w = w - 30;
h = Convert.ToInt32(w * div);
this.pictureBox1.Left = 15;
this.pictureBox1.Top -= (h - pictureBox1.Image.Height) / 2;
}
Bitmap NewBitmap = new Bitmap(this.pictureBox1.InitialImage, w, h);
this.pictureBox1.Image = NewBitmap;
}
private void button1_Click(object sender, EventArgs e)
{
max();
}
private void button2_Click(object sender, EventArgs e)
{
min();
}
private void pictureBox1_MouseWheel(object sender, System.Windows.Forms.MouseEventArgs e)
{
int numberOfTextLinesToMove = e.Delta * SystemInformation.MouseWheelScrollLines / 120;
if (numberOfTextLinesToMove > 0)
{
for (int i = 0; i < numberOfTextLinesToMove; i )
{
max();
}
}
else if (numberOfTextLinesToMove < 0)
{
for (int i = 0; i > numberOfTextLinesToMove; i--)
{
min();
}
}
}
private Point mouseDownPoint = new Point();
private bool isSelected = false;
private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
mouseDownPoint.X = Cursor.Position.X;
mouseDownPoint.Y = Cursor.Position.Y;
isSelected = true;
}
}
private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
{
isSelected = false;
}
private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
{
if (isSelected && IsMouseInPanel())
{
this.pictureBox1.Left = this.pictureBox1.Left (Cursor.Position.X - mouseDownPoint.X);
this.pictureBox1.Top = this.pictureBox1.Top (Cursor.Position.Y - mouseDownPoint.Y);
mouseDownPoint.X = Cursor.Position.X;
mouseDownPoint.Y = Cursor.Position.Y;
}
this.toolStrip1.Visible = false;
}
private bool IsMouseInPanel()
{
if (this.panel1.Left < PointToClient(Cursor.Position).X && PointToClient(Cursor.Position).X < this.panel1.Left this.panel1.Width && this.panel1.Top < PointToClient(Cursor.Position).Y && PointToClient(Cursor.Position).Y < this.panel1.Top this.panel1.Height)
{
return true;
}
else
{
return false;
}
}
private void pictureBox1_MouseEnter(object sender, EventArgs e)
{
pictureBox1.Focus();
}
private void toolStripButton3_Click(object sender, EventArgs e)
{
reset100();
}
private void pictureBox1_MouseLeave(object sender, EventArgs e)
{
if (IsMouseInPanel())
{
if (timer1 != null)
{
timer1.Dispose();
}
InitialTimer1();
}
else
{
this.label1.Focus();
this.toolStrip1.Visible = false;
}
}
private void panel1_MouseHover(object sender, EventArgs e)
{
if (timer1 != null)
{
timer1.Dispose();
}
InitialTimer1();
}
private void pictureBox1_MouseHover(object sender, EventArgs e)
{
if (timer1 != null)
{
timer1.Dispose();
}
InitialTimer1();
}
private Timer timer1;
private void InitialTimer1()
{
this.timer1 = new Timer();
timer1.Enabled = true;
timer1.Interval = 1200;
timer1.Tick = new EventHandler(timer1_Tick);
}
void timer1_Tick(object sender, EventArgs e)
{
this.toolStrip1.Location = PointToClient(Cursor.Position);
this.toolStrip1.Visible = true;
}
private void panel1_MouseMove(object sender, MouseEventArgs e)
{
this.toolStrip1.Visible = false;
}
private void toolStrip1_MouseEnter(object sender, EventArgs e)
{
if (timer1 != null)
{
timer1.Dispose();
}
}
private void toolStripButton1_MouseDown(object sender, MouseEventArgs e)
{
InitialTimer2();
}
private void toolStripButton2_MouseDown(object sender, MouseEventArgs e)
{
InitialTimer3();
}
private Timer timer2;
private void InitialTimer2()
{
this.timer2 = new Timer();
timer2.Enabled = true;
timer2.Interval = 200;
timer2.Tick = new EventHandler(timer2_Tick);
}
void timer2_Tick(object sender, EventArgs e)
{
max();
}
private Timer timer3;
private void InitialTimer3()
{
this.timer3 = new Timer();
timer3.Enabled = true;
timer3.Interval = 200;
timer3.Tick = new EventHandler(timer3_Tick);
}
void timer3_Tick(object sender, EventArgs e)
{
min();
}
private void toolStripButton2_MouseUp(object sender, MouseEventArgs e)
{
if (timer3 != null)
{
timer3.Dispose();
}
}
private void toolStripButton1_MouseUp(object sender, MouseEventArgs e)
{
if (timer2 != null)
{
timer2.Dispose();
}
}
private void toolStripComboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
switch (toolStripComboBox1.SelectedIndex)
{
case 0:
reset50();
break;
case 1:
reset100();
break;
case 2:
reset150();
break;
case 3:
reset200();
break;
default:
reset100();
break;
}
}
private void reset50()
{
this.pictureBox1.Left = 293;
this.pictureBox1.Top = 179;
Bitmap NewBitmap = new Bitmap(this.pictureBox1.InitialImage, 275, 198);
this.pictureBox1.Image = NewBitmap;
}
private void reset100()
{
this.pictureBox1.Left = 155;
this.pictureBox1.Top = 80;
Bitmap NewBitmap = new Bitmap(this.pictureBox1.InitialImage, 550, 395);
this.pictureBox1.Image = NewBitmap;
}
private void reset150()
{
this.pictureBox1.Left = 17;
this.pictureBox1.Top = -19;
Bitmap NewBitmap = new Bitmap(this.pictureBox1.InitialImage, 825, 593);
this.pictureBox1.Image = NewBitmap;
}
private void reset200()
{
this.pictureBox1.Left = -120;
this.pictureBox1.Top = -118;
Bitmap NewBitmap = new Bitmap(this.pictureBox1.InitialImage, 1100, 790);
this.pictureBox1.Image = NewBitmap;
}
private void Form1_Load(object sender, EventArgs e)
{
reset100();
this.toolStripComboBox1.SelectedIndex = 1;
}
private void toolStripButton1_Click(object sender, EventArgs e)
{
max();
}
private void toolStripButton2_Click(object sender, EventArgs e)
{
min();
}
}
}
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