在winforms中，用户如何在运行时调整控件的大小

jw5wzhpr  于 2023-11-21  发布在  其他
关注(0)|答案(6)|浏览(274)

假设我有一个图片框。
现在我想要的是，用户应该能够随意调整pictureBox的大小。然而，我甚至不知道如何开始这件事。我已经搜索了互联网，但信息是稀缺的。
有没有人能告诉我从哪里开始？

winforms

6条答案

按热度按时间
b4qexyjb

b4qexyjb1#

这很容易做到，Windows中的每个窗口都有天生的可调整大小的能力。它只是关闭了PictureBox，你可以通过监听WM_NCHITTEST message来重新打开它。你只需告诉Windows光标在窗口的一角，你还需要画一个抓柄，这样用户就可以清楚地看到拖动角可以调整框的大小。
添加一个新的类到你的项目中，然后粘贴如下所示的代码。Build + Build。你将在工具箱的顶部得到一个新的控件，将它放在窗体上。设置Image属性，你就可以尝试了。

  1. using System;
  2. using System.Drawing;
  3. using System.Windows.Forms;
  5. class SizeablePictureBox : PictureBox {
  6.     public SizeablePictureBox() {
  7.         this.ResizeRedraw = true;
  8.     }
  9.     protected override void OnPaint(PaintEventArgs e) {
  10.         base.OnPaint(e);
  11.         var rc = new Rectangle(this.ClientSize.Width - grab, this.ClientSize.Height - grab, grab, grab);
  12.         ControlPaint.DrawSizeGrip(e.Graphics, this.BackColor, rc); 
  13.     }
  14.     protected override void WndProc(ref Message m) {
  15.         base.WndProc(ref m);
  16.         if (m.Msg == 0x84) {  // Trap WM_NCHITTEST
  17.             var pos = this.PointToClient(new Point(m.LParam.ToInt32()));
  18.             if (pos.X >= this.ClientSize.Width - grab && pos.Y >= this.ClientSize.Height - grab)
  19.                 m.Result = new IntPtr(17);  // HT_BOTTOMRIGHT
  20.         }
  21.     }
  22.     private const int grab = 16;
  23. }

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另一个免费获取WndProc的 * 非常 * 便宜的方法是给控件一个可调整大小的边框。它适用于所有的角和边。将以下代码粘贴到类中（你不再需要WndProc了）：

  1. protected override CreateParams CreateParams {
  2.     get {
  3.         var cp = base.CreateParams;
  4.         cp.Style |= 0x840000;  // Turn on WS_BORDER + WS_THICKFRAME
  5.         return cp;
  6.     }
  7. }

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h22fl7wq

h22fl7wq2#

在this article中使用ControlMoverOrResizer类，您可以在运行时仅用一行代码即可实现可移动和可调整大小的控件！：）示例：
System. out. println（）;
现在button 1是一个可移动和可调整大小的控件！

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q35jwt9p

q35jwt9p3#

这里有一篇文章
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这里的C#翻译

  1. using System;
  2. using System.Collections;
  3. using System.Collections.Generic;
  4. using System.Data;
  5. using System.Diagnostics;
  6. public class Form1
  7. {
  9.     ResizeableControl rc;
  11.     private void Form1_Load(System.Object sender, System.EventArgs e)
  12.     {
  13.         rc = new ResizeableControl(pbDemo);
  15.     }
  16.     public Form1()
  17.     {
  18.         Load += Form1_Load;
  19.     }
  21. }

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和重新调整功能大小

  1. using System;
  2. using System.Collections;
  3. using System.Collections.Generic;
  4. using System.Data;
  5. using System.Diagnostics;
  6. public class ResizeableControl
  7. {
  9.     private Control withEventsField_mControl;
  10.     private Control mControl {
  11.         get { return withEventsField_mControl; }
  12.         set {
  13.             if (withEventsField_mControl != null) {
  14.                 withEventsField_mControl.MouseDown -= mControl_MouseDown;
  15.                 withEventsField_mControl.MouseUp -= mControl_MouseUp;
  16.                 withEventsField_mControl.MouseMove -= mControl_MouseMove;
  17.                 withEventsField_mControl.MouseLeave -= mControl_MouseLeave;
  18.             }
  19.             withEventsField_mControl = value;
  20.             if (withEventsField_mControl != null) {
  21.                 withEventsField_mControl.MouseDown += mControl_MouseDown;
  22.                 withEventsField_mControl.MouseUp += mControl_MouseUp;
  23.                 withEventsField_mControl.MouseMove += mControl_MouseMove;
  24.                 withEventsField_mControl.MouseLeave += mControl_MouseLeave;
  25.             }
  26.         }
  27.     }
  28.     private bool mMouseDown = false;
  29.     private EdgeEnum mEdge = EdgeEnum.None;
  30.     private int mWidth = 4;
  32.     private bool mOutlineDrawn = false;
  33.     private enum EdgeEnum
  34.     {
  35.         None,
  36.         Right,
  37.         Left,
  38.         Top,
  39.         Bottom,
  40.         TopLeft
  41.     }
  43.     public ResizeableControl(Control Control)
  44.     {
  45.         mControl = Control;
  46.     }
  48.     private void mControl_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
  49.     {
  50.         if (e.Button == System.Windows.Forms.MouseButtons.Left) {
  51.             mMouseDown = true;
  52.         }
  53.     }
  55.     private void mControl_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)
  56.     {
  57.         mMouseDown = false;
  58.     }
  60.     private void mControl_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
  61.     {
  62.         Control c = (Control)sender;
  63.         Graphics g = c.CreateGraphics;
  64.         switch (mEdge) {
  65.             case EdgeEnum.TopLeft:
  66.                 g.FillRectangle(Brushes.Fuchsia, 0, 0, mWidth * 4, mWidth * 4);
  67.                 mOutlineDrawn = true;
  68.                 break;
  69.             case EdgeEnum.Left:
  70.                 g.FillRectangle(Brushes.Fuchsia, 0, 0, mWidth, c.Height);
  71.                 mOutlineDrawn = true;
  72.                 break;
  73.             case EdgeEnum.Right:
  74.                 g.FillRectangle(Brushes.Fuchsia, c.Width - mWidth, 0, c.Width, c.Height);
  75.                 mOutlineDrawn = true;
  76.                 break;
  77.             case EdgeEnum.Top:
  78.                 g.FillRectangle(Brushes.Fuchsia, 0, 0, c.Width, mWidth);
  79.                 mOutlineDrawn = true;
  80.                 break;
  81.             case EdgeEnum.Bottom:
  82.                 g.FillRectangle(Brushes.Fuchsia, 0, c.Height - mWidth, c.Width, mWidth);
  83.                 mOutlineDrawn = true;
  84.                 break;
  85.             case EdgeEnum.None:
  86.                 if (mOutlineDrawn) {
  87.                     c.Refresh();
  88.                     mOutlineDrawn = false;
  89.                 }
  90.                 break;
  91.         }
  93.         if (mMouseDown & mEdge != EdgeEnum.None) {
  94.             c.SuspendLayout();
  95.             switch (mEdge) {
  96.                 case EdgeEnum.TopLeft:
  97.                     c.SetBounds(c.Left + e.X, c.Top + e.Y, c.Width, c.Height);
  98.                     break;
  99.                 case EdgeEnum.Left:
  100.                     c.SetBounds(c.Left + e.X, c.Top, c.Width - e.X, c.Height);
  101.                     break;
  102.                 case EdgeEnum.Right:
  103.                     c.SetBounds(c.Left, c.Top, c.Width - (c.Width - e.X), c.Height);
  104.                     break;
  105.                 case EdgeEnum.Top:
  106.                     c.SetBounds(c.Left, c.Top + e.Y, c.Width, c.Height - e.Y);
  107.                     break;
  108.                 case EdgeEnum.Bottom:
  109.                     c.SetBounds(c.Left, c.Top, c.Width, c.Height - (c.Height - e.Y));
  110.                     break;
  111.             }
  112.             c.ResumeLayout();
  113.         } else {
  114.             switch (true) {
  115.                 case e.X <= (mWidth * 4) & e.Y <= (mWidth * 4):
  116.                     //top left corner
  117.                     c.Cursor = Cursors.SizeAll;
  118.                     mEdge = EdgeEnum.TopLeft;
  119.                     break;
  120.                 case e.X <= mWidth:
  121.                     //left edge
  122.                     c.Cursor = Cursors.VSplit;
  123.                     mEdge = EdgeEnum.Left;
  124.                     break;
  125.                 case e.X > c.Width - (mWidth + 1):
  126.                     //right edge
  127.                     c.Cursor = Cursors.VSplit;
  128.                     mEdge = EdgeEnum.Right;
  129.                     break;
  130.                 case e.Y <= mWidth:
  131.                     //top edge
  132.                     c.Cursor = Cursors.HSplit;
  133.                     mEdge = EdgeEnum.Top;
  134.                     break;
  135.                 case e.Y > c.Height - (mWidth + 1):
  136.                     //bottom edge
  137.                     c.Cursor = Cursors.HSplit;
  138.                     mEdge = EdgeEnum.Bottom;
  139.                     break;
  140.                 default:
  141.                     //no edge
  142.                     c.Cursor = Cursors.Default;
  143.                     mEdge = EdgeEnum.None;
  144.                     break;
  145.             }
  146.         }
  147.     }
  149.     private void mControl_MouseLeave(object sender, System.EventArgs e)
  150.     {
  151.         Control c = (Control)sender;
  152.         mEdge = EdgeEnum.None;
  153.         c.Refresh();
  154.     }
  156. }

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cbeh67ev

cbeh67ev4#

创建一个新的c# winform应用程序并粘贴以下内容：
别忘了说谢谢，当它帮助你...
http://www.codeproject.com/script/Articles/ArticleVersion.aspx?aid=743923&av=1095793&msg=4778687

  1. using System;
  2. using System.Collections.Generic;
  3. using System.ComponentModel;
  4. using System.Data;
  5. using System.Drawing;
  6. using System.Linq;
  7. using System.Text;
  8. using System.Windows.Forms;
  10. namespace WindowsFormsApplication1
  11.   {
  12.  public partial class MyForm : Form
  13.   {
  14.     //Public Declaration:
  15.     double rW = 0;
  16.     double rH = 0;
  18.     int fH = 0;
  19.     int fW = 0;
  21.     // @ Form Initialization
  22.     public MyForm()
  23.     {
  24.         InitializeComponent();
  25.         this.Resize += MyForm_Resize; // handles resize routine
  26.         this.tabControl1.Dock = DockStyle.None;
  28.     }
  30.     private void MyForm_Resize(object sender, EventArgs e)
  31.     {
  32.         rResize(this,true); //Call the routine
  34.     }
  36.     private void rResize(Control t, bool hasTabs) // Routine to Auto resize the control
  37.     {
  39.         // this will return to normal default size when 1 of the conditions is met
  41.         string[] s = null;
  43.         if (this.Width < fW || this.Height < fH)
  44.         {
  46.             this.Width = (int)fW;
  47.             this.Height = (int)fH;
  49.             return;
  50.         }
  52.         foreach (Control c in t.Controls)
  53.         {
  54.             // Option 1:
  55.             double rRW = (t.Width > rW ? t.Width / (rW) : rW / t.Width);
  56.             double rRH = (t.Height > rH ? t.Height / (rH) : rH / t.Height);
  58.             // Option 2:
  59.             //  double rRW = t.Width / rW;
  60.             //  double rRH = t.Height / rH;
  62.             s = c.Tag.ToString().Split('/');
  63.             if (c.Name == s[0].ToString())
  64.             {
  65.                 //Use integer casting
  66.                 c.Width = (int)(Convert.ToInt32(s[3]) * rRW);
  67.                 c.Height = (int)(Convert.ToInt32(s[4]) * rRH);
  68.                 c.Left = (int)(Convert.ToInt32(s[1]) * rRW);
  69.                 c.Top = (int)(Convert.ToInt32(s[2]) * rRH);
  70.             }
  71.             if (hasTabs)
  72.             {
  73.                 if (c.GetType() == typeof(TabControl))
  74.                 {
  76.                     foreach (Control f in c.Controls)
  77.                     {
  78.                         foreach (Control j in f.Controls) //tabpage
  79.                         {
  80.                             s = j.Tag.ToString().Split('/');
  82.                             if (j.Name == s[0].ToString())
  83.                             {
  85.                                 j.Width = (int)(Convert.ToInt32(s[3]) * rRW);
  86.                                 j.Height = (int)(Convert.ToInt32(s[4]) * rRH);
  87.                                 j.Left = (int)(Convert.ToInt32(s[1]) * rRW);
  88.                                 j.Top = (int)(Convert.ToInt32(s[2]) * rRH);
  89.                             }
  90.                         }
  91.                     }
  92.                 }
  93.             }
  95.         }
  96.     }
  98.     // @ Form Load Event
  99.     private void MyForm_Load(object sender, EventArgs e)
  100.     {
  102.         // Put values in the variables
  104.         rW = this.Width;
  105.         rH = this.Height;
  107.         fW = this.Width;
  108.         fH = this.Height;
  110.         // Loop through the controls inside the  form i.e. Tabcontrol Container
  111.         foreach (Control c in this.Controls)
  112.         {
  113.             c.Tag = c.Name + "/" + c.Left + "/" + c.Top + "/" + c.Width + "/" + c.Height;
  115.             // c.Anchor = (AnchorStyles.Right |  AnchorStyles.Left ); 
  117.             if (c.GetType() == typeof(TabControl))
  118.             {
  120.                 foreach (Control f in c.Controls)
  121.                 {
  123.                     foreach (Control j in f.Controls) //tabpage
  124.                     {
  125.                         j.Tag = j.Name + "/" + j.Left + "/" + j.Top + "/" + j.Width + "/" + j.Height;
  126.                     }
  127.                 }
  128.             }
  129.         }
  130.     }
  131. }
  132. }

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问候，Kix46

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n8ghc7c1

n8ghc7c15#

  1. namespace utils
  2. {
  3. using System;
  4. using System.Collections.Generic;
  5. using System.Linq;
  6. using System.Text;
  7. using System.Windows.Forms;
  8. using System.IO;
  9. using System.Data;
  10. using System.Globalization;
  11. using System.Xml;
  12. using System.Text.RegularExpressions;
  13. using System.Drawing;
  14. public static class Helper
  15. {
  16.     public const int WM_NCLBUTTONDOWN = 0xA1;
  17.     public const int HTCAPTION = 2;
  18.     public static int WS_THICKFRAME = 0x00040000;
  19.     public static int GWL_STYLE = -16;
  20.     public static int GWL_EXSTYLE = -20;
  21.     public static int WS_EX_LAYERED = 0x00080000;
  22.     public const int WS_RESIZABLE = 0x840000; //WS_BORDER + WS_THICKFRAME
  24.     [System.Runtime.InteropServices.DllImport("user32.dll")]
  25.     static extern IntPtr GetSystemMenu(IntPtr hWnd, bool bRevert);
  27.     [System.Runtime.InteropServices.DllImport("user32.dll")]
  28.     static extern bool AppendMenu(IntPtr hMenu, uint uFlags, uint uIDNewItem, string lpNewItem);
  30.     [System.Runtime.InteropServices.DllImport("user32.dll")]
  31.     public static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);
  33.     [System.Runtime.InteropServices.DllImport("user32.dll")]
  34.     public static extern int GetWindowLong(IntPtr hWnd, int nIndex);
  36.     [System.Runtime.InteropServices.DllImport("user32.dll")]
  37.     public static extern int
  38.     SetLayeredWindowAttributes(IntPtr Handle, int Clr, byte transparency, int clrkey);
  40.     [System.Runtime.InteropServices.DllImport("shell32.dll")]
  41.     public static extern IntPtr ShellExecute(IntPtr hwnd, string lpOperation, string lpFile, string lpParameters, string lpDirectory, int nShowCmd);
  43.     [return: System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.Bool)]
  44.     [System.Runtime.InteropServices.DllImport("user32.dll", SetLastError = true)]
  45.     public static extern bool PostMessage(IntPtr hWnd, int Msg, IntPtr wParam, IntPtr lParam);
  47.     [System.Runtime.InteropServices.DllImport("kernel32.dll")]
  48.     public static extern uint GetCurrentThreadId();
  49.     public static string ProcessException(this Exception ex)
  50.     {
  51.         StringBuilder strBuild = new StringBuilder(5000);
  52.         Exception inner = ex;
  53.         Enumerable.Range(0, 30).All(x =>
  54.         {
  55.             if (x == 0) strBuild.Append("########## Exception begin on thread id : " + GetCurrentThreadId().ToString() + " @ :" + DateTime.Now.ToString() + " ##########\n");
  56.             strBuild.Append("---------------------[" + x.ToString() + "]---------------------\n");
  57.             strBuild.Append("Message : " + inner.Message + "\nStack Trace : " + inner.StackTrace + "\n");
  58.             strBuild.Append("---------------------[" + x.ToString() + "]---------------------\n");
  59.             inner = inner.InnerException;
  60.             if (inner == null)
  61.             {
  62.                 strBuild.Append("########## Exception End on thread id : " + GetCurrentThreadId().ToString() + " @ :" + DateTime.Now.ToString() + " ##########\n\n");
  63.                 return false;
  64.             }
  65.             return true;
  66.         });
  67.         return strBuild.ToString();
  68.     }
  69.    
  70.    public static void MakeResizable(this Panel pnl)
  71.     {
  72.         int dwCurStyle = Helper.GetWindowLong(pnl.Handle, GWL_STYLE);
  73.         dwCurStyle = dwCurStyle | Helper.WS_RESIZABLE;
  74.         Helper.SetWindowLong(pnl.Handle, GWL_STYLE, dwCurStyle);
  75.     }
  76. }
  78.  protected override void OnLoad(EventArgs e)
  79.     {
  80.         imagePanel.MakeResizable();
  81.         base.OnLoad(e);            
  82.     }

字符串
其中imgPanel是WinForm应用程序中的某个面板

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xfyts7mz

xfyts7mz6#

我在我的中奖申请表上写了

  1. public partial class logoPosition : Form
  2.     {
  3.         bool Draggable = false, ResizableH = false, ResizableW = false;
  4.         int XOffset = 0, YOffset = 0;
  5.         public logoPosition()
  6.         {
  7.             InitializeComponent();
  8.         }
  10.         private void logoPosition_Load(object sender, EventArgs e)
  11.         {
  12.             Image logo = new Bitmap(@"\Sign_Transparent.png");
  13.             PBLogo.Image = logo;
  14.             PBLogo.Margin = new Padding(3);
  15.             PBLogo.Location = new Point(3, 3);
  16.             PBLogo.BorderStyle = BorderStyle.FixedSingle;
  17.             PBLogo.SizeMode = PictureBoxSizeMode.StretchImage;
  18.             txtW.Text = PBLogo.Width.ToString();
  19.             txtH.Text = PBLogo.Height.ToString();
  20.             txtX.Text = PBLogo.Location.X.ToString();
  21.             txtY.Text = PBLogo.Location.Y.ToString();
  22.         }
  24.         private void btnReset_Click(object sender, EventArgs e)
  25.         {
  26.             PBLogo.Margin = new Padding(3);
  27.             PBLogo.Location = new Point(3, 3);
  28.             PBLogo.BorderStyle = BorderStyle.FixedSingle;
  29.             PBLogo.SizeMode = PictureBoxSizeMode.StretchImage;
  30.             PBLogo.Height = 50;
  31.             PBLogo.Width = 100;
  32.         }
  34.         private void PBLogo_MouseMove(object sender, MouseEventArgs e)
  35.         {
  37.             //set location for PictureBox bottom side;
  38.             Rectangle recBottomSide = new Rectangle(0 ,  PBLogo.Height-3, PBLogo.Width,10);
  39.             //set location for PictureBox right side;
  40.             Rectangle recRightSide = new Rectangle(PBLogo.Width-3, 0, 10, PBLogo.Height);
  41.             
  43.             if (recBottomSide.Contains(e.Location))
  44.             {
  45.                 PBLogo.Cursor = Cursors.SizeNS;
  46.             }
  47.             else if(recRightSide.Contains(e.Location))
  48.             {
  49.                 PBLogo.Cursor = Cursors.SizeWE;
  50.             }
  51.             else
  52.             {
  53.                 PBLogo.Cursor = Cursors.SizeAll;
  54.             }
  56.             int XMoved = e.Location.X - XOffset;
  57.             int YMoved = e.Location.Y - YOffset;
  58.             Point newPosition = new Point();
  60.             if (Draggable)
  61.             {
  63.                 newPosition.X = PBLogo.Location.X + XMoved;
  64.                 newPosition.Y = PBLogo.Location.Y + YMoved;
  66.                 if (newPosition.X + PBLogo.Width >= panel1.Width || newPosition.X <= 0)
  67.                     newPosition.X = PBLogo.Location.X;
  68.                 if (newPosition.Y + PBLogo.Height > panel1.Height || newPosition.Y <= 0)
  69.                     newPosition.Y = PBLogo.Location.Y;
  71.                 PBLogo.Location = newPosition;
  72.                 
  73.             }
  74.             if(ResizableH)
  75.             {
  76.                 if (PBLogo.Location.Y + e.Y < panel1.Height)
  77.                 {
  78.                     PBLogo.Height = e.Y;
  79.                     if (PBLogo.Height < 30) PBLogo.Height = 30;
  80.                 }
  81.             }
  82.             if(ResizableW)
  83.             {
  84.                 if (PBLogo.Location.X + e.X < panel1.Width)
  85.                 {
  86.                     PBLogo.Width = e.X;
  87.                     if (PBLogo.Width < 30) PBLogo.Width = 30;
  88.                 }
  89.             }
  91.             txtW.Text = PBLogo.Width.ToString();
  92.             txtH.Text = PBLogo.Height.ToString();
  93.             txtX.Text = PBLogo.Location.X.ToString();
  94.             txtY.Text = PBLogo.Location.Y.ToString();
  96.             
  98.             
  99.         }
  101.         private void PBLogo_MouseDown(object sender, MouseEventArgs e)
  102.         {
  103.             XOffset = e.X;
  104.             YOffset = e.Y;
  106.             if (PBLogo.Cursor == Cursors.SizeAll)
  107.             {
  108.                 Draggable = true;
  109.                 ResizableW = false;
  110.                 ResizableH = false;
  111.             }
  112.             if(PBLogo.Cursor == Cursors.SizeNS)
  113.             {
  114.                 Draggable = false;
  115.                 ResizableW = false;
  116.                 ResizableH = true;
  117.             }
  118.             if (PBLogo.Cursor == Cursors.SizeWE)
  119.             {
  120.                 Draggable = false;
  121.                 ResizableW = true;
  122.                 ResizableH = false;
  123.             }
  125.         }
  127.         private void PBLogo_MouseUp(object sender, MouseEventArgs e)
  128.         {
  129.             Draggable = false;
  130.             ResizableW = false;
  131.             ResizableH = false;
  132.         }
  133.     }

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