说我有一个pictureBox。
现在我想要的是用户应该可以随意调整pictureBox的大小。但是我不知道如何开始这件事。我搜索了互联网，但信息很少。
至少有人可以指导我从哪里开始吗？
答案 0 :(得分：26)
这很容易做到，Windows中的每个窗口都具有可调整大小的固有能力。它只是关闭了PictureBox，您可以通过监听WM_NCHITTEST message将其重新打开。您只需告诉Windows光标位于窗口的一角，您就可以免费获得其他所有内容。您还需要绘制一个抓握手柄，这样用户就可以清楚地看到拖动角落会调整框的大小。
在项目中添加一个新类并粘贴下面显示的代码。构建+构建。您将在工具箱顶部获得一个新控件，将其放在表单上。设置Image属性，然后设置为尝试它。
using System;
using System.Drawing;
using System.Windows.Forms;
class SizeablePictureBox : PictureBox {
public SizeablePictureBox() {
this.ResizeRedraw = true;
}
protected override void OnPaint(PaintEventArgs e) {
base.OnPaint(e);
var rc = new Rectangle(this.ClientSize.Width - grab, this.ClientSize.Height - grab, grab, grab);
ControlPaint.DrawSizeGrip(e.Graphics, this.BackColor, rc);
}
protected override void WndProc(ref Message m) {
base.WndProc(ref m);
if (m.Msg == 0x84) { // Trap WM_NCHITTEST
var pos = this.PointToClient(new Point(m.LParam.ToInt32()));
if (pos.X >= this.ClientSize.Width - grab && pos.Y >= this.ClientSize.Height - grab)
m.Result = new IntPtr(17); // HT_BOTTOMRIGHT
}
}
private const int grab = 16;
}
另一种非常免费调整大小的方法是给控件一个可调整大小的边框。适用于所有角落和边缘。将此代码粘贴到类中（您不再需要WndProc）：
protected override CreateParams CreateParams {
get {
var cp = base.CreateParams;
cp.Style |= 0x840000; // Turn on WS_BORDER + WS_THICKFRAME
return cp;
}
}
答案 1 :(得分：4)
这是一篇文章
http://www.codeproject.com/Articles/20716/Allow-the-User-to-Resize-Controls-at-Runtime
这应该对你有帮助，因为它在vb这里是一个C＃翻译
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Diagnostics;
public class Form1
{
ResizeableControl rc;
private void Form1_Load(System.Object sender, System.EventArgs e)
{
rc = new ResizeableControl(pbDemo);
}
public Form1()
{
Load += Form1_Load;
}
}
AND RE-SIZE FUNCTION
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Diagnostics;
public class ResizeableControl
{
private Control withEventsField_mControl;
private Control mControl {
get { return withEventsField_mControl; }
set {
if (withEventsField_mControl != null) {
withEventsField_mControl.MouseDown -= mControl_MouseDown;
withEventsField_mControl.MouseUp -= mControl_MouseUp;
withEventsField_mControl.MouseMove -= mControl_MouseMove;
withEventsField_mControl.MouseLeave -= mControl_MouseLeave;
}
withEventsField_mControl = value;
if (withEventsField_mControl != null) {
withEventsField_mControl.MouseDown += mControl_MouseDown;
withEventsField_mControl.MouseUp += mControl_MouseUp;
withEventsField_mControl.MouseMove += mControl_MouseMove;
withEventsField_mControl.MouseLeave += mControl_MouseLeave;
}
}
}
private bool mMouseDown = false;
private EdgeEnum mEdge = EdgeEnum.None;
private int mWidth = 4;
private bool mOutlineDrawn = false;
private enum EdgeEnum
{
None,
Right,
Left,
Top,
Bottom,
TopLeft
}
public ResizeableControl(Control Control)
{
mControl = Control;
}
private void mControl_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
{
if (e.Button == System.Windows.Forms.MouseButtons.Left) {
mMouseDown = true;
}
}
private void mControl_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)
{
mMouseDown = false;
}
private void mControl_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
{
Control c = (Control)sender;
Graphics g = c.CreateGraphics;
switch (mEdge) {
case EdgeEnum.TopLeft:
g.FillRectangle(Brushes.Fuchsia, 0, 0, mWidth * 4, mWidth * 4);
mOutlineDrawn = true;
break;
case EdgeEnum.Left:
g.FillRectangle(Brushes.Fuchsia, 0, 0, mWidth, c.Height);
mOutlineDrawn = true;
break;
case EdgeEnum.Right:
g.FillRectangle(Brushes.Fuchsia, c.Width - mWidth, 0, c.Width, c.Height);
mOutlineDrawn = true;
break;
case EdgeEnum.Top:
g.FillRectangle(Brushes.Fuchsia, 0, 0, c.Width, mWidth);
mOutlineDrawn = true;
break;
case EdgeEnum.Bottom:
g.FillRectangle(Brushes.Fuchsia, 0, c.Height - mWidth, c.Width, mWidth);
mOutlineDrawn = true;
break;
case EdgeEnum.None:
if (mOutlineDrawn) {
c.Refresh();
mOutlineDrawn = false;
}
break;
}
if (mMouseDown & mEdge != EdgeEnum.None) {
c.SuspendLayout();
switch (mEdge) {
case EdgeEnum.TopLeft:
c.SetBounds(c.Left + e.X, c.Top + e.Y, c.Width, c.Height);
break;
case EdgeEnum.Left:
c.SetBounds(c.Left + e.X, c.Top, c.Width - e.X, c.Height);
break;
case EdgeEnum.Right:
c.SetBounds(c.Left, c.Top, c.Width - (c.Width - e.X), c.Height);
break;
case EdgeEnum.Top:
c.SetBounds(c.Left, c.Top + e.Y, c.Width, c.Height - e.Y);
break;
case EdgeEnum.Bottom:
c.SetBounds(c.Left, c.Top, c.Width, c.Height - (c.Height - e.Y));
break;
}
c.ResumeLayout();
} else {
switch (true) {
case e.X <= (mWidth * 4) & e.Y <= (mWidth * 4):
//top left corner
c.Cursor = Cursors.SizeAll;
mEdge = EdgeEnum.TopLeft;
break;
case e.X <= mWidth:
//left edge
c.Cursor = Cursors.VSplit;
mEdge = EdgeEnum.Left;
break;
case e.X > c.Width - (mWidth + 1):
//right edge
c.Cursor = Cursors.VSplit;
mEdge = EdgeEnum.Right;
break;
case e.Y <= mWidth:
//top edge
c.Cursor = Cursors.HSplit;
mEdge = EdgeEnum.Top;
break;
case e.Y > c.Height - (mWidth + 1):
//bottom edge
c.Cursor = Cursors.HSplit;
mEdge = EdgeEnum.Bottom;
break;
default:
//no edge
c.Cursor = Cursors.Default;
mEdge = EdgeEnum.None;
break;
}
}
}
private void mControl_MouseLeave(object sender, System.EventArgs e)
{
Control c = (Control)sender;
mEdge = EdgeEnum.None;
c.Refresh();
}
}
答案 2 :(得分：4)
使用this article中的ControlMoverOrResizer类，您可以在运行时使用一行代码执行可移动和可调整大小的控件！ :)示例：
ControlMoverOrResizer.Init（按钮1）;
现在button1是一个可移动且可调整大小的控件！
答案 3 :(得分：2)
创建一个新的c＃winform应用程序并粘贴它：
当它帮助你时，不要忘记说谢谢......
http://www.codeproject.com/script/Articles/ArticleVersion.aspx?aid=743923&av=1095793&msg=4778687
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 WindowsFormsApplication1
{
public partial class MyForm : Form
{
//Public Declaration:
double rW = 0;
double rH = 0;
int fH = 0;
int fW = 0;
// @ Form Initialization
public MyForm()
{
InitializeComponent();
this.Resize += MyForm_Resize; // handles resize routine
this.tabControl1.Dock = DockStyle.None;
}
private void MyForm_Resize(object sender, EventArgs e)
{
rResize(this,true); //Call the routine
}
private void rResize(Control t, bool hasTabs) // Routine to Auto resize the control
{
// this will return to normal default size when 1 of the conditions is met
string[] s = null;
if (this.Width < fW || this.Height < fH)
{
this.Width = (int)fW;
this.Height = (int)fH;
return;
}
foreach (Control c in t.Controls)
{
// Option 1:
double rRW = (t.Width > rW ? t.Width / (rW) : rW / t.Width);
double rRH = (t.Height > rH ? t.Height / (rH) : rH / t.Height);
// Option 2:
// double rRW = t.Width / rW;
// double rRH = t.Height / rH;
s = c.Tag.ToString().Split('/');
if (c.Name == s[0].ToString())
{
//Use integer casting
c.Width = (int)(Convert.ToInt32(s[3]) * rRW);
c.Height = (int)(Convert.ToInt32(s[4]) * rRH);
c.Left = (int)(Convert.ToInt32(s[1]) * rRW);
c.Top = (int)(Convert.ToInt32(s[2]) * rRH);
}
if (hasTabs)
{
if (c.GetType() == typeof(TabControl))
{
foreach (Control f in c.Controls)
{
foreach (Control j in f.Controls) //tabpage
{
s = j.Tag.ToString().Split('/');
if (j.Name == s[0].ToString())
{
j.Width = (int)(Convert.ToInt32(s[3]) * rRW);
j.Height = (int)(Convert.ToInt32(s[4]) * rRH);
j.Left = (int)(Convert.ToInt32(s[1]) * rRW);
j.Top = (int)(Convert.ToInt32(s[2]) * rRH);
}
}
}
}
}
}
}
// @ Form Load Event
private void MyForm_Load(object sender, EventArgs e)
{
// Put values in the variables
rW = this.Width;
rH = this.Height;
fW = this.Width;
fH = this.Height;
// Loop through the controls inside the form i.e. Tabcontrol Container
foreach (Control c in this.Controls)
{
c.Tag = c.Name + "/" + c.Left + "/" + c.Top + "/" + c.Width + "/" + c.Height;
// c.Anchor = (AnchorStyles.Right | AnchorStyles.Left );
if (c.GetType() == typeof(TabControl))
{
foreach (Control f in c.Controls)
{
foreach (Control j in f.Controls) //tabpage
{
j.Tag = j.Name + "/" + j.Left + "/" + j.Top + "/" + j.Width + "/" + j.Height;
}
}
}
}
}
}
}
此致 Kix46
答案 4 :(得分：0)
namespace utils
{
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Data;
using System.Globalization;
using System.Xml;
using System.Text.RegularExpressions;
using System.Drawing;
public static class Helper
{
public const int WM_NCLBUTTONDOWN = 0xA1;
public const int HTCAPTION = 2;
public static int WS_THICKFRAME = 0x00040000;
public static int GWL_STYLE = -16;
public static int GWL_EXSTYLE = -20;
public static int WS_EX_LAYERED = 0x00080000;
public const int WS_RESIZABLE = 0x840000; //WS_BORDER + WS_THICKFRAME
[System.Runtime.InteropServices.DllImport("user32.dll")]
static extern IntPtr GetSystemMenu(IntPtr hWnd, bool bRevert);
[System.Runtime.InteropServices.DllImport("user32.dll")]
static extern bool AppendMenu(IntPtr hMenu, uint uFlags, uint uIDNewItem, string lpNewItem);
[System.Runtime.InteropServices.DllImport("user32.dll")]
public static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);
[System.Runtime.InteropServices.DllImport("user32.dll")]
public static extern int GetWindowLong(IntPtr hWnd, int nIndex);
[System.Runtime.InteropServices.DllImport("user32.dll")]
public static extern int
SetLayeredWindowAttributes(IntPtr Handle, int Clr, byte transparency, int clrkey);
[System.Runtime.InteropServices.DllImport("shell32.dll")]
public static extern IntPtr ShellExecute(IntPtr hwnd, string lpOperation, string lpFile, string lpParameters, string lpDirectory, int nShowCmd);
[return: System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.Bool)]
[System.Runtime.InteropServices.DllImport("user32.dll", SetLastError = true)]
public static extern bool PostMessage(IntPtr hWnd, int Msg, IntPtr wParam, IntPtr lParam);
[System.Runtime.InteropServices.DllImport("kernel32.dll")]
public static extern uint GetCurrentThreadId();
public static string ProcessException(this Exception ex)
{
StringBuilder strBuild = new StringBuilder(5000);
Exception inner = ex;
Enumerable.Range(0, 30).All(x =>
{
if (x == 0) strBuild.Append("########## Exception begin on thread id : " + GetCurrentThreadId().ToString() + " @ :" + DateTime.Now.ToString() + " ##########\n");
strBuild.Append("---------------------[" + x.ToString() + "]---------------------\n");
strBuild.Append("Message : " + inner.Message + "\nStack Trace : " + inner.StackTrace + "\n");
strBuild.Append("---------------------[" + x.ToString() + "]---------------------\n");
inner = inner.InnerException;
if (inner == null)
{
strBuild.Append("########## Exception End on thread id : " + GetCurrentThreadId().ToString() + " @ :" + DateTime.Now.ToString() + " ##########\n\n");
return false;
}
return true;
});
return strBuild.ToString();
}
public static void MakeResizable(this Panel pnl)
{
int dwCurStyle = Helper.GetWindowLong(pnl.Handle, GWL_STYLE);
dwCurStyle = dwCurStyle | Helper.WS_RESIZABLE;
Helper.SetWindowLong(pnl.Handle, GWL_STYLE, dwCurStyle);
}
}
protected override void OnLoad(EventArgs e)
{
imagePanel.MakeResizable();
base.OnLoad(e);
}
其中 imgPanel 是 WinForm 应用程序中的某个面板