using System; using System.Drawing; using System.Windows.Forms; class BlockOut: Form { bool bBlocking, bValidBox; Point ptBeg, ptEnd; Rectangle rectBox; public static void Main() { Application.Run(new BlockOut()); } protected override void OnMouseDown(MouseEventArgs mea) { if (mea.Button == MouseButtons.Left) { ptBeg = ptEnd = new Point(mea.X, mea.Y); Graphics grfx = CreateGraphics(); grfx.DrawRectangle(new Pen(ForeColor), Rect(ptBeg, ptEnd)); grfx.Dispose(); bBlocking = true; } } protected override void OnMouseMove(MouseEventArgs mea) { if (bBlocking) { Graphics grfx = CreateGraphics(); grfx.DrawRectangle(new Pen(BackColor), Rect(ptBeg, ptEnd)); ptEnd = new Point(mea.X, mea.Y); grfx.DrawRectangle(new Pen(ForeColor), Rect(ptBeg, ptEnd)); grfx.Dispose(); Invalidate(); } } protected override void OnMouseUp(MouseEventArgs mea) { if (bBlocking && mea.Button == MouseButtons.Left) { Graphics grfx = CreateGraphics(); rectBox = Rect(ptBeg, new Point(mea.X, mea.Y)); grfx.DrawRectangle(new Pen(ForeColor), rectBox); grfx.Dispose(); bBlocking = false; bValidBox = true; Invalidate(); } } protected override void OnPaint(PaintEventArgs pea) { Graphics grfx = pea.Graphics; if (bValidBox) grfx.FillRectangle(new SolidBrush(ForeColor), rectBox); if (bBlocking) grfx.DrawRectangle(new Pen(ForeColor), Rect(ptBeg, ptEnd)); } Rectangle Rect(Point ptBeg, Point ptEnd) { return new Rectangle(Math.Min(ptBeg.X, ptEnd.X), Math.Min(ptBeg.Y, ptEnd.Y), Math.Abs(ptEnd.X - ptBeg.X), Math.Abs(ptEnd.Y - ptBeg.Y)); } }
Event
Register Form Mouse Move, down and up action
using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; public class Form1 : Form { bool shouldPaint = false; public Form1() { InitializeComponent(); } private void PainterForm_MouseDown( object sender, MouseEventArgs e ) { shouldPaint = true; } private void PainterForm_MouseUp( object sender, MouseEventArgs e ) { shouldPaint = false; } private void PainterForm_MouseMove( object sender, MouseEventArgs e ) { if ( shouldPaint ) { Graphics graphics = CreateGraphics(); graphics.FillEllipse(new SolidBrush( Color.BlueViolet ), e.X, e.Y, 4, 4 ); graphics.Dispose(); } } private void InitializeComponent() { this.SuspendLayout(); this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F); this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font; this.ClientSize = new System.Drawing.Size(184, 180); this.Name = "PainterForm"; this.Text = "Painter"; this.MouseDown += new System.Windows.Forms.MouseEventHandler(this.PainterForm_MouseDown); this.MouseUp += new System.Windows.Forms.MouseEventHandler(this.PainterForm_MouseUp); this.MouseMove += new System.Windows.Forms.MouseEventHandler(this.PainterForm_MouseMove); this.ResumeLayout(false); } [STAThread] static void Main() { Application.EnableVisualStyles(); Application.Run(new Form1()); } }
Mouse left click, right click, middle click, hover
using System; using System.Drawing; using System.Collections; using System.ComponentModel; using System.Windows.Forms; using System.Data; public class frmMouseButtons : System.Windows.Forms.Form { private System.Windows.Forms.Label lblLeftClick; private System.Windows.Forms.Label lblRightClick; private System.Windows.Forms.Label lblMiddleClick; private System.Windows.Forms.Label lblHover; public frmMouseButtons() { this.lblLeftClick = new System.Windows.Forms.Label(); this.lblRightClick = new System.Windows.Forms.Label(); this.lblMiddleClick = new System.Windows.Forms.Label(); this.lblHover = new System.Windows.Forms.Label(); this.SuspendLayout(); this.lblLeftClick.Location = new System.Drawing.Point(8, 8); this.lblRightClick.Location = new System.Drawing.Point(8, 32); this.lblRightClick.Size = new System.Drawing.Size(100, 32); this.lblMiddleClick.Location = new System.Drawing.Point(8, 72); this.lblHover.Location = new System.Drawing.Point(8, 104); this.lblHover.MouseEnter += new System.EventHandler(this.lblHover_MouseEnter); this.lblHover.MouseHover += new System.EventHandler(this.lblHover_MouseHover); this.lblHover.MouseLeave += new System.EventHandler(this.lblHover_MouseLeave); this.AutoScaleBaseSize = new System.Drawing.Size(5, 13); this.ClientSize = new System.Drawing.Size(184, 198); this.Controls.AddRange(new System.Windows.Forms.Control[] { this.lblHover, this.lblMiddleClick, this.lblRightClick, this.lblLeftClick}); this.MaximizeBox = false; this.ResumeLayout(false); } protected override void OnMouseDown(MouseEventArgs e) { switch (e.Button) { case (MouseButtons.Left): lblLeftClick.Text = "Left Click"; break; case (MouseButtons.Middle): lblLeftClick.Text = "Middle Click"; break; case (MouseButtons.Right): lblLeftClick.Text = "Right Click"; break; case (MouseButtons.XButton1): lblLeftClick.Text = "XButton1 Click"; break; case (MouseButtons.XButton2): lblLeftClick.Text = "XButton2 Click"; break; } switch (e.Clicks) { case 1: lblMiddleClick.Text = "Single Click"; break; case 2: lblMiddleClick.Text = "Double Click!"; break; default: lblMiddleClick.Text = "Many clicks!"; break; } } protected override void OnMouseWheel(MouseEventArgs e) { switch (e.Delta) { case -360: lblRightClick.Text = "One Rotation Reverse"; break; case -720: lblRightClick.Text = "Two Rotations Reverse"; break; case 360: lblRightClick.Text = "One Rotation Forward"; break; case 720: lblRightClick.Text = "Two Rotations Forward"; break; default: lblRightClick.Text = "Rotation wasn't full turn of wheel"; break; } } protected void lblHover_MouseEnter(object sender, EventArgs e) { lblRightClick.Text = "One Rotation Forward"; lblHover.Text = "Entering label"; Cursor = Cursors.NoMove2D; } protected void lblHover_MouseHover(object sender, EventArgs e) { lblHover.Text = "Hovering over label"; Cursor = Cursors.Hand; System.Diagnostics.Debug.WriteLine("hover"); } protected void lblHover_MouseLeave(object sender, EventArgs e) { lblHover.Text = "Leaving label"; Cursor = Cursors.Default; } [STAThread] static void Main() { Application.Run(new frmMouseButtons()); } }
Which mouse button was clicked?
using System; using System.Windows.Forms; using System.Drawing; public class MainWindow : Form { public MainWindow() { Height = 300; Width = 500; this.MouseMove += new MouseEventHandler(MainForm_MouseMove); this.MouseUp += new MouseEventHandler(MainForm_MouseUp); this.KeyUp += new KeyEventHandler(MainForm_KeyUp); } protected void MainForm_MouseMove(object sender, MouseEventArgs e) { this.Text = string.Format("Current Pos: ({0}, {1})", e.X, e.Y); } protected void MainForm_MouseUp(object sender, MouseEventArgs e) { if (e.Button == MouseButtons.Left) MessageBox.Show("Left click!"); if (e.Button == MouseButtons.Right) MessageBox.Show("Right click!"); if (e.Button == MouseButtons.Middle) MessageBox.Show("Middle click!"); } protected void MainForm_KeyUp(object sender, KeyEventArgs e) { MessageBox.Show(e.KeyCode.ToString(), "Key Pressed!"); } public static void Main(string[] args) { Application.Run(new MainWindow()); } }
Register Form window message filter
using System; using System.Windows.Forms; using Microsoft.Win32; public class MyMessageFilter : IMessageFilter { public bool PreFilterMessage(ref Message m) { // Intercept the left mouse button down message. if (m.Msg == 513) { Console.WriteLine("WM_LBUTTONDOWN is: " + m.Msg); return true; } return false; } } public class mainForm : System.Windows.Forms.Form { private MyMessageFilter msgFliter = new MyMessageFilter(); public mainForm() { GetStats(); Application.ApplicationExit += new EventHandler(Form_OnExit); Application.AddMessageFilter(msgFliter); } [STAThread] static void Main() { Application.Run(new mainForm()); } private void GetStats() { Console.WriteLine(Application.CompanyName+ " Company:"); Console.WriteLine(Application.ProductName+ " App Name:"); Console.WriteLine(Application.StartupPath); } // Event handlers. private void Form_OnExit(object sender, EventArgs evArgs) { Console.WriteLine("Exit", "This app is dead..."); Application.RemoveMessageFilter(msgFliter); } }
Cast event sender to a control
using System; using System.Drawing; using System.Windows.Forms; class InstantiateHelloWorld { public static void Main() { Form form = new Form(); form.Text = "Instantiate " + form.Text; form.Paint += new PaintEventHandler(MyPaintHandler); Application.Run(form); } static void MyPaintHandler(object objSender, PaintEventArgs pea) { Form form = (Form)objSender; Graphics graphics = pea.Graphics; graphics.DrawString("Hello from InstantiateHelloWorld!", form.Font, Brushes.Black, 0, 100); } }
Keyboard Sample
/* Professional Windows GUI Programming Using C# by Jay Glynn, Csaba Torok, Richard Conway, Wahid Choudhury, Zach Greenvoss, Shripad Kulkarni, Neil Whitlow Publisher: Peer Information ISBN: 1861007663 */ using System; using System.Drawing; using System.Collections; using System.ComponentModel; using System.Windows.Forms; using System.Data; using System.Text; namespace KeyboardSample { /// <summary> /// Summary description for KeyboardSample. /// </summary> public class KeyboardSample : System.Windows.Forms.Form { private System.Windows.Forms.TextBox textBox1; private System.Windows.Forms.TextBox textBox2; private System.Windows.Forms.GroupBox groupBox1; private System.Windows.Forms.Label label1; private System.Windows.Forms.GroupBox groupBox2; private System.Windows.Forms.Label label2; /// <summary> /// Required designer variable. /// </summary> private System.ComponentModel.Container components = null; public KeyboardSample() { // // Required for Windows Form Designer support // InitializeComponent(); // // TODO: Add any constructor code after InitializeComponent call // } /// <summary> /// Clean up any resources being used. /// </summary> protected override void Dispose( bool disposing ) { if( disposing ) { if (components != null) { components.Dispose(); } } base.Dispose( disposing ); } #region Windows Form Designer generated code /// <summary> /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// </summary> private void InitializeComponent() { this.textBox1 = new System.Windows.Forms.TextBox(); this.textBox2 = new System.Windows.Forms.TextBox(); this.groupBox1 = new System.Windows.Forms.GroupBox(); this.label1 = new System.Windows.Forms.Label(); this.groupBox2 = new System.Windows.Forms.GroupBox(); this.label2 = new System.Windows.Forms.Label(); this.groupBox1.SuspendLayout(); this.groupBox2.SuspendLayout(); this.SuspendLayout(); // // textBox1 // this.textBox1.Location = new System.Drawing.Point(16, 24); this.textBox1.Name = "textBox1"; this.textBox1.Size = new System.Drawing.Size(168, 20); this.textBox1.TabIndex = 5; this.textBox1.Text = ""; this.textBox1.KeyDown += new System.Windows.Forms.KeyEventHandler(this.textBox1_KeyDown); // // textBox2 // this.textBox2.Location = new System.Drawing.Point(16, 24); this.textBox2.Name = "textBox2"; this.textBox2.Size = new System.Drawing.Size(168, 20); this.textBox2.TabIndex = 6; this.textBox2.Text = ""; this.textBox2.KeyDown += new System.Windows.Forms.KeyEventHandler(this.textBox2_KeyDown); // // groupBox1 // this.groupBox1.Controls.AddRange(new System.Windows.Forms.Control[] { this.label1, this.textBox1}); this.groupBox1.Location = new System.Drawing.Point(8, 8); this.groupBox1.Name = "groupBox1"; this.groupBox1.TabIndex = 7; this.groupBox1.TabStop = false; this.groupBox1.Text = "Key Monitor"; // // label1 // this.label1.Location = new System.Drawing.Point(16, 64); this.label1.Name = "label1"; this.label1.Size = new System.Drawing.Size(168, 20); this.label1.TabIndex = 6; // // groupBox2 // this.groupBox2.Controls.AddRange(new System.Windows.Forms.Control[] { this.textBox2, this.label2}); this.groupBox2.Location = new System.Drawing.Point(8, 120); this.groupBox2.Name = "groupBox2"; this.groupBox2.TabIndex = 8; this.groupBox2.TabStop = false; this.groupBox2.Text = "Keys Enumeration"; // // label2 // this.label2.Location = new System.Drawing.Point(16, 64); this.label2.Name = "label2"; this.label2.Size = new System.Drawing.Size(168, 20); this.label2.TabIndex = 9; // // KeyboardSample // this.AutoScaleBaseSize = new System.Drawing.Size(5, 13); this.ClientSize = new System.Drawing.Size(216, 229); this.Controls.AddRange(new System.Windows.Forms.Control[] { this.groupBox2, this.groupBox1}); this.Name = "KeyboardSample"; this.Text = "KeyboardSample"; this.groupBox1.ResumeLayout(false); this.groupBox2.ResumeLayout(false); this.ResumeLayout(false); } #endregion /// <summary> /// The main entry point for the application. /// </summary> [STAThread] static void Main() { Application.Run(new KeyboardSample()); } private void textBox1_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e) { label1.Text = Convert.ToString(e.KeyValue); } private void textBox2_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e) { StringBuilder sb = new StringBuilder(); if(e.Shift) sb.Append("Shift, "); if(e.Alt) sb.Append("Alt, "); if(e.Control) sb.Append("Ctrl, "); if(e.KeyCode==Keys.W||e.KeyCode==Keys.R||e.KeyCode==Keys.O||e.KeyCode==Keys.X) { sb.Append("Wrox Press!!"); } else if(e.KeyCode==Keys.Escape&&e.Modifiers==(Keys.Shift|Keys.Alt)) { sb.Append("Escape - that won't work!"); } else if(e.KeyCode == Keys.C && e.Modifiers==(Keys.Alt | Keys.Control)) { sb.Append("CopyRight"); textBox2.SelectedText = "CopyRight"; textBox2.SelectionLength = 0; } else { sb.Append(Convert.ToString(e.KeyData)); } label2.Text = sb.ToString(); } } }