Csharp/C Sharp/GUI Windows Form/Form Event
Содержание
- 1 Bind key action to a form window
- 2 Cancel Event
- 3 Form Focus event
- 4 Form Key Press action
- 5 Form Mouse down action
- 6 Form OnMove event
- 7 Form OnResize
- 8 Form Paint event
- 9 Form resize and redraw
- 10 Form window closing event
- 11 Form Window event: closing, closed, load, activated, deactivated
- 12 Form window load event
- 13 OnClick event
- 14 OnInputLanguageChanged
- 15 OnKeyDown event
- 16 OnMouseEnter, OnMouseHover, OnMouseLeave event
- 17 On Mouse Wheel
- 18 Scrolling (AutoScrollMinSize)
- 19 Scroll Shapes
- 20 Uncloseable event
Bind key action to a form window
<source lang="csharp"> using System; using System.Drawing; using System.Collections; using System.ruponentModel; using System.Windows.Forms; using System.Data; public class KeyReader : System.Windows.Forms.Form {
private System.Windows.Forms.Label lblPress;
private System.Windows.Forms.Label lblDown;
private System.Windows.Forms.Label label1;
public KeyReader() {
InitializeComponent();
}
private void InitializeComponent() {
this.lblPress = new System.Windows.Forms.Label();
this.lblDown = new System.Windows.Forms.Label();
this.label1 = new System.Windows.Forms.Label();
this.SuspendLayout();
this.lblPress.Font = new System.Drawing.Font("Microsoft Sans Serif", 30F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
this.lblPress.Location = new System.Drawing.Point(8, 190);
this.lblPress.Name = "lblPress";
this.lblPress.Size = new System.Drawing.Size(408, 48);
this.lblPress.TabIndex = 0;
this.lblPress.Text = "Press:";
this.lblPress.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
this.lblDown.Font = new System.Drawing.Font("Microsoft Sans Serif", 30F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
this.lblDown.Location = new System.Drawing.Point(8, 254);
this.lblDown.Name = "lblDown";
this.lblDown.Size = new System.Drawing.Size(408, 48);
this.lblDown.TabIndex = 0;
this.lblDown.Text = "Down:";
this.lblDown.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(424, 365);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.label1,
this.lblDown,
this.lblPress});
this.KeyPreview = true;
this.Name = "KeyReader";
this.Text = "KeyReader";
this.KeyDown += new System.Windows.Forms.KeyEventHandler(this.KeyReader_KeyDown);
this.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.KeyReader_KeyPress);
this.ResumeLayout(false);
}
[STAThread]
static void Main() {
Application.Run(new KeyReader());
}
private void KeyReader_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e) {
lblPress.Text = "Press: " + Convert.ToString(e.KeyChar);
}
private void KeyReader_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e) {
lblDown.Text = "Down: " + Convert.ToString(e.KeyCode);
if (e.KeyCode == Keys.ShiftKey){
MessageBox.Show("That is one shifty character");
}
}
}
</source>
Cancel Event
<source lang="csharp">
using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
public class Form1 : System.Windows.Forms.Form
{
private Button myButton;
public Form1()
{
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(292, 273);
this.Closing+=new CancelEventHandler(Form_Closing);
myButton = new Button();
myButton.Text = "www.nfex.ru";
myButton.Location = new System.Drawing.Point(64, 32);
myButton.Size = new System.Drawing.Size(150, 50);
Controls.Add(myButton);
}
public void Form_Closing(object sender,CancelEventArgs cArgs) {
cArgs.Cancel=true;
}
static void Main()
{
Application.Run(new Form1());
}
}
</source>
Form Focus event
<source lang="csharp"> using System; using System.Drawing; using System.Collections; using System.ruponentModel; using System.Windows.Forms; using System.Data; public class FocusForm : System.Windows.Forms.Form {
private System.Windows.Forms.TextBox txtFocusForm;
private System.Windows.Forms.Button btFocusForm;
public FocusForm() {
this.txtFocusForm = new System.Windows.Forms.TextBox();
this.btFocusForm = new System.Windows.Forms.Button();
this.SuspendLayout();
this.txtFocusForm.Location = new System.Drawing.Point(8, 8);
this.txtFocusForm.Size = new System.Drawing.Size(336, 20);
this.txtFocusForm.LostFocus += new System.EventHandler(this.txtFocusForm_LostFocus);
this.txtFocusForm.GotFocus += new System.EventHandler(this.txtFocusForm_GotFocus);
this.btFocusForm.Location = new System.Drawing.Point(8, 40);
this.btFocusForm.Size = new System.Drawing.Size(336, 23);
this.btFocusForm.Click += new System.EventHandler(this.btFocusForm_Click);
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(352, 70);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.btFocusForm,
this.txtFocusForm});
this.ResumeLayout(false);
}
[STAThread]
static void Main() {
Application.Run(new FocusForm());
}
protected void txtFocusForm_LostFocus(object sender, EventArgs e) {
Console.WriteLine("Goodbye!");
}
protected void txtFocusForm_GotFocus(object sender, EventArgs e) {
Console.WriteLine("Hello!");
}
private void btFocusForm_Click(object sender, System.EventArgs e) {
bool canFocus = txtFocusForm.CanFocus;
bool containsFocus = this.ContainsFocus;
bool focused = txtFocusForm.Focused;
Console.WriteLine("Textbox can focus: " + canFocus +
"\nForm children contain focus: " + containsFocus +
"\nTextbox has focus: " + focused);
txtFocusForm.Focus();
}
}
</source>
Form Key Press action
<source lang="csharp"> using System; using System.Drawing; using System.Collections; using System.ruponentModel; using System.Windows.Forms; using System.Data; using System.Drawing.Drawing2D; public class Form1 : System.Windows.Forms.Form{
public Form1() {
InitializeComponent();
}
private void InitializeComponent() {
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(292, 273);
this.Name = "Form1";
this.Text = "Form1";
this.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.Form1_KeyPress);
}
static void Main() {
Application.Run(new Form1());
}
private void Form1_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e) {
Console.WriteLine("Key Press");
}
}
</source>
Form Mouse down action
<source lang="csharp"> using System; using System.Drawing; using System.Collections; using System.ruponentModel; using System.Windows.Forms; using System.Data; using System.Drawing.Drawing2D; public class Form1 : System.Windows.Forms.Form{
public Form1() {
InitializeComponent();
}
private void InitializeComponent() {
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(292, 273);
this.Name = "Form1";
this.Text = "Form1";
this.MouseDown += new System.Windows.Forms.MouseEventHandler(this.Form1_MouseDown);
}
static void Main() {
Application.Run(new Form1());
}
private void Form1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e) {
Console.WriteLine("Mouse down");
}
}
</source>
Form OnMove event
<source lang="csharp">
using System; using System.Drawing; using System.Windows.Forms;
class FormSize: Form {
public static void Main()
{
Application.Run(new FormSize());
}
public FormSize()
{
Text = "Form Size";
BackColor = Color.White;
}
protected override void OnMove(EventArgs ea)
{
Invalidate();
}
protected override void OnPaint(PaintEventArgs pea)
{
Graphics graphics = pea.Graphics;
string str = "Location: " + Location + "\n" +
"ClientRectangle: " + ClientRectangle;
graphics.DrawString(str, Font, Brushes.Black, 0, 0);
}
}
</source>
Form OnResize
<source lang="csharp">
using System; using System.Drawing; using System.Windows.Forms;
class FormSize: Form {
public static void Main()
{
Application.Run(new FormSize());
}
public FormSize()
{
BackColor = Color.White;
}
protected override void OnResize(EventArgs ea)
{
Invalidate();
}
protected override void OnPaint(PaintEventArgs pea)
{
Graphics graphics = pea.Graphics;
string str = "Location: " + Location + "\n" +
"ClientRectangle: " + ClientRectangle;
graphics.DrawString(str, Font, Brushes.Black, 0, 0);
}
}
</source>
Form Paint event
<source lang="csharp">
using System; using System.Drawing; using System.Windows.Forms;
class PaintEvent {
public static void Main()
{
Form form = new Form();
form.Text = "Paint Event";
form.Paint += new PaintEventHandler(MyPaintHandler);
Application.Run(form);
}
static void MyPaintHandler(object objSender, PaintEventArgs pea)
{
Graphics graphics = pea.Graphics;
graphics.Clear(Color.Chocolate);
}
}
</source>
Form resize and redraw
<source lang="csharp"> using System; using System.Collections.Generic; using System.ruponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; public class Form1 : Form {
private System.Windows.Forms.CheckBox chkResizeRedraw;
public Form1() {
InitializeComponent();
}
private void FlawedResizing_Paint(object sender, PaintEventArgs e)
{
ResizeRedraw = chkResizeRedraw.Checked;
Pen pen = new Pen(Color.Red, 1);
e.Graphics.DrawEllipse(pen, new Rectangle(new Point(0, 0),
this.ClientSize));
pen.Dispose();
}
private void chkResizeRedraw_CheckedChanged(object sender, EventArgs e)
{
Invalidate();
}
private void InitializeComponent()
{
this.chkResizeRedraw = new System.Windows.Forms.CheckBox();
this.SuspendLayout();
//
// chkResizeRedraw
//
this.chkResizeRedraw.AutoSize = true;
this.chkResizeRedraw.Location = new System.Drawing.Point(102, 104);
this.chkResizeRedraw.Name = "chkResizeRedraw";
this.chkResizeRedraw.Size = new System.Drawing.Size(95, 17);
this.chkResizeRedraw.TabIndex = 0;
this.chkResizeRedraw.Text = "ResizeRedraw";
this.chkResizeRedraw.CheckedChanged += new System.EventHandler(this.chkResizeRedraw_CheckedChanged);
//
// FlawedResizing
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(292, 266);
this.Controls.Add(this.chkResizeRedraw);
this.Name = "FlawedResizing";
this.SizeGripStyle = System.Windows.Forms.SizeGripStyle.Hide;
this.Text = "FlawedResizing";
this.Paint += new System.Windows.Forms.PaintEventHandler(this.FlawedResizing_Paint);
this.ResumeLayout(false);
this.PerformLayout();
}
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.Run(new Form1());
}
}
</source>
Form window closing event
<source lang="csharp">
using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
public class Form1 : System.Windows.Forms.Form
{
private Button myButton;
public Form1()
{
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(292, 273);
this.Closing+=new CancelEventHandler(Form_Closing);
myButton = new Button();
myButton.Text = "www.nfex.ru";
myButton.Location = new System.Drawing.Point(64, 32);
myButton.Size = new System.Drawing.Size(150, 50);
Controls.Add(myButton);
CenterToScreen();
}
public void Form_Closing(object sender,CancelEventArgs cArgs) {
if(sender==this){
MessageBox.Show("Form Closing Event....");
if(sender!=this) {
cArgs.Cancel=true;
}
}
}
static void Main()
{
Application.Run(new Form1());
}
}
</source>
Form Window event: closing, closed, load, activated, deactivated
<source lang="csharp"> using System; using System.Windows.Forms; using System.ruponentModel; public class MainWindow : Form {
private string lifeTimeInfo;
public MainWindow() {
this.Closing += new CancelEventHandler(MainForm_Closing);
this.Load += new EventHandler(MainForm_Load);
this.Closed += new EventHandler(MainForm_Closed);
this.Activated += new EventHandler(MainForm_Activated);
this.Deactivate += new EventHandler(MainForm_Deactivate);
}
protected void MainForm_Closing(object sender, CancelEventArgs e) {
DialogResult dr = MessageBox.Show("Do you REALLY want to close this app?",
"Closing event!", MessageBoxButtons.YesNo);
if (dr == DialogResult.No)
e.Cancel = true;
else
e.Cancel = false;
}
protected void MainForm_Load(object sender, System.EventArgs e) {
lifeTimeInfo += "Load event\n";
}
protected void MainForm_Activated(object sender, System.EventArgs e) {
lifeTimeInfo += "Activate event\n";
}
protected void MainForm_Deactivate(object sender, System.EventArgs e) {
lifeTimeInfo += "Deactivate event\n";
}
protected void MainForm_Closed(object sender, System.EventArgs e) {
lifeTimeInfo += "Closed event\n";
MessageBox.Show(lifeTimeInfo);
}
public static void Main(string[] args) {
Application.Run(new MainWindow());
}
}
</source>
Form window load event
<source lang="csharp">
using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
public class Form1 : System.Windows.Forms.Form
{
private Button myButton;
public Form1()
{
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(292, 273);
this.Load+=new EventHandler(Form_Load);
myButton = new Button();
myButton.Text = "www.nfex.ru";
myButton.Location = new System.Drawing.Point(64, 32);
myButton.Size = new System.Drawing.Size(150, 50);
Controls.Add(myButton);
CenterToScreen();
}
public void Form_Load(object sender,EventArgs eArgs)
{
MessageBox.Show("Loading Form.....");
}
static void Main()
{
Application.Run(new Form1());
}
}
</source>
OnClick event
<source lang="csharp"> using System; using System.Drawing; using System.Drawing.Printing; using System.Windows.Forms;
class PrintableForm: Form {
public static void Main()
{
Application.Run(new PrintableForm());
}
public PrintableForm()
{
ResizeRedraw = true;
}
protected override void OnPaint(PaintEventArgs pea)
{
DoPage(pea.Graphics, ForeColor,ClientSize.Width, ClientSize.Height);
}
protected override void OnClick(EventArgs ea)
{
PrintDocument prndoc = new PrintDocument();
prndoc.DocumentName = Text;
prndoc.PrintPage += new PrintPageEventHandler(PrintDocumentOnPrintPage);
prndoc.Print();
}
void PrintDocumentOnPrintPage(object obj, PrintPageEventArgs ppea)
{
Graphics grfx = ppea.Graphics;
SizeF sizef = grfx.VisibleClipBounds.Size;
DoPage(grfx, Color.Black, (int)sizef.Width, (int)sizef.Height);
}
protected virtual void DoPage(Graphics grfx, Color clr, int cx, int cy)
{
Pen pen = new Pen(clr);
grfx.DrawLine(pen, 0, 0, cx - 1, cy - 1);
grfx.DrawLine(pen, cx - 1, 0, 0, cy - 1);
}
}
</source>
OnInputLanguageChanged
<source lang="csharp"> using System; using System.Drawing; using System.Collections; using System.ruponentModel; using System.Windows.Forms; using System.Data; public class InternationalText : System.Windows.Forms.Form {
internal System.Windows.Forms.Label lblInternationalText;
internal System.Windows.Forms.Label lblCharCode;
private System.Windows.Forms.TextBox textBox1;
public InternationalText() {
this.lblInternationalText = new System.Windows.Forms.Label();
this.lblCharCode = new System.Windows.Forms.Label();
this.textBox1 = new System.Windows.Forms.TextBox();
this.SuspendLayout();
this.lblInternationalText.Location = new System.Drawing.Point(8, 64);
this.lblInternationalText.Size = new System.Drawing.Size(288, 23);
this.lblCharCode.Location = new System.Drawing.Point(8, 96);
this.lblCharCode.Size = new System.Drawing.Size(88, 23);
this.textBox1.Location = new System.Drawing.Point(8, 24);
this.textBox1.Size = new System.Drawing.Size(288, 20);
this.textBox1.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.textBox1_KeyPress);
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(304, 134);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.textBox1,
this.lblCharCode,
this.lblInternationalText});
this.MaximizeBox = false;
this.ResumeLayout(false);
}
[STAThread]
static void Main() {
Application.Run(new InternationalText());
}
protected override void OnInputLanguageChanged(InputLanguageChangedEventArgs e) {
MessageBox.Show(e.InputLanguage.Culture.Name);
}
protected override void OnInputLanguageChanging(InputLanguageChangingEventArgs e) {
MessageBox.Show(e.InputLanguage.Culture.Name);
}
private void textBox1_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e) {
lblInternationalText.Text += e.KeyChar.ToString();
lblCharCode.Text = ((int)e.KeyChar).ToString();
}
}
</source>
OnKeyDown event
<source lang="csharp">
using System; using System.Drawing; using System.Windows.Forms;
class ExitOnX: Form {
public static void Main()
{
Application.Run(new ExitOnX());
}
public ExitOnX()
{
Text = "Exit on X";
}
protected override void OnKeyDown(KeyEventArgs kea)
{
if (kea.KeyCode == Keys.X)
Close();
}
}
</source>
OnMouseEnter, OnMouseHover, OnMouseLeave event
<source lang="csharp"> using System; using System.Drawing; using System.Windows.Forms;
class EnterLeave: Form {
bool bInside = false;
public static void Main()
{
Application.Run(new EnterLeave());
}
public EnterLeave()
{
}
protected override void OnMouseEnter(EventArgs ea)
{
bInside = true;
Invalidate();
}
protected override void OnMouseLeave(EventArgs ea)
{
bInside = false;
Invalidate();
}
protected override void OnMouseHover(EventArgs ea)
{
Graphics grfx = CreateGraphics();
grfx.Clear(Color.Red);
System.Threading.Thread.Sleep(500);
grfx.Clear(Color.Green);
grfx.Dispose();
}
protected override void OnPaint(PaintEventArgs pea)
{
Graphics grfx = pea.Graphics;
grfx.Clear(bInside ? Color.Green : BackColor);
}
}
</source>
On Mouse Wheel
<source lang="csharp"> using System; using System.Drawing; using System.Windows.Forms;
class PoePoem: Form {
public static void Main()
{
if (!SystemInformation.MouseWheelPresent)
{
Console.WriteLine("Program needs a mouse with a mouse wheel!");
return;
}
Application.Run(new PoePoem());
}
public PoePoem()
{
}
protected override void OnMouseWheel(MouseEventArgs mea)
{
Console.WriteLine(mea.Delta);
}
}
</source>
Scrolling (AutoScrollMinSize)
<source lang="csharp">
using System; using System.Drawing; using System.Collections; using System.ruponentModel; using System.Windows.Forms; using System.Data; public class Form1 : System.Windows.Forms.Form {
[STAThread]
static void Main() {
Application.Run(new Form1());
}
protected override void OnPaint(PaintEventArgs e) {
Graphics g;
g = Graphics.FromHwnd(this.Handle);
GraphicsUnit units = GraphicsUnit.Pixel;
string path = "your.jpg";
Image im = Image.FromFile(path);
this.AutoScrollMinSize = new Size(im.Width, im.Height);
//this.AutoScroll = true;
Point P = this.AutoScrollPosition;
Rectangle dstR = this.ClientRectangle;
RectangleF srcR = new RectangleF(-P.X, -P.Y, dstR.Width, dstR.Height);
g.DrawImage(im, dstR, srcR, units);
g.Dispose();
}
}
</source>
Scroll Shapes
<source lang="csharp"> using System; using System.Collections.Generic; using System.ruponentModel; using System.Data; using System.Drawing;
using System.Text; using System.Windows.Forms; public class Form1 : Form {
private Point rectangleTopLeft = new Point(0, 0);
private Size rectangleSize = new Size(200, 200);
private Point ellipseTopLeft = new Point(50, 200);
private Size ellipseSize = new Size(200, 150);
private Pen bluePen = new Pen(Color.Blue, 3);
private Pen redPen = new Pen(Color.Red, 2);
protected override void OnPaint(PaintEventArgs e) {
base.OnPaint(e);
Graphics dc = e.Graphics;
Size scrollOffset = new Size(this.AutoScrollPosition);
if (e.ClipRectangle.Top + scrollOffset.Width < 350 ||
e.ClipRectangle.Left + scrollOffset.Height < 250) {
Rectangle rectangleArea = new Rectangle
(rectangleTopLeft + scrollOffset, rectangleSize);
Rectangle ellipseArea = new Rectangle
(ellipseTopLeft + scrollOffset, ellipseSize);
dc.DrawRectangle(bluePen, rectangleArea);
dc.DrawEllipse(redPen, ellipseArea);
}
}
public Form1() {
this.BackColor = Color.White;
this.Size = new System.Drawing.Size(300, 300);
this.AutoScrollMinSize = new Size(250, 350);
}
public static void Main() {
Application.Run(new Form1());
}
}
</source>
Uncloseable event
<source lang="csharp">
using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
public class Form1 : System.Windows.Forms.Form
{
private Button myButton;
public Form1()
{
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(292, 273);
this.Closing+=new CancelEventHandler(Form_Closing);
myButton = new Button();
myButton.Text = "www.nfex.ru";
myButton.Location = new System.Drawing.Point(64, 32);
myButton.Size = new System.Drawing.Size(150, 50);
Controls.Add(myButton);
}
public void Form_Closing(object sender,CancelEventArgs cArgs) {
cArgs.Cancel=true;
}
static void Main()
{
Application.Run(new Form1());
}
}
</source>
