Csharp/CSharp Tutorial/GUI Windows Forms/Button
Содержание
- 1 Add a Button
- 2 Add action handler to button
- 3 Auto Scale Button
- 4 Button Background Color
- 5 Button Flat Style
- 6 Button Image
- 7 Button mouse event
- 8 Button PerformClick Method
- 9 Button Style: image button, standard button
- 10 Button Text Alignment
- 11 Calculate Button size based on its Text
- 12 Device Independent Button
- 13 extends Button
- 14 Handle button messages
- 15 Relocate button after pressing button
- 16 Set Label text in a button click event
- 17 Use delegate to add an event handler to a Button
Add a Button
<source lang="csharp">using System; using System.Windows.Forms; using System.Drawing;
class ButtonForm : Form {
Button MyButton = new Button();
public ButtonForm() {
Text = "Using a Button";
MyButton = new Button();
MyButton.Text = "Press Here";
MyButton.Location = new Point(100, 200);
Controls.Add(MyButton);
}
[STAThread]
public static void Main() {
ButtonForm skel = new ButtonForm();
Application.Run(skel);
}
}</source>
Add action handler to button
<source lang="csharp">using System; using System.Drawing; using System.Collections; using System.ruponentModel; using System.Windows.Forms; using System.Data; public class ButtonActionForm : System.Windows.Forms.Form {
private System.Windows.Forms.Button button1;
private System.ruponentModel.Container components = null;
public ButtonActionForm()
{
InitializeComponent();
}
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
private void InitializeComponent()
{
this.button1 = new System.Windows.Forms.Button();
this.SuspendLayout();
this.button1.Location = new System.Drawing.Point(109, 122);
this.button1.Name = "button1";
this.button1.TabIndex = 0;
this.button1.Text = "Say Hello";
this.button1.Click += new System.EventHandler(this.button1_Click);
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(292, 266);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.button1});
this.Name = "ButtonActionForm";
this.ResumeLayout(false);
}
[STAThread]
static void Main()
{
Application.Run(new ButtonActionForm());
}
private void button1_Click(object sender, System.EventArgs e)
{
MessageBox.Show( this, "Hello" );
}
}</source>
Auto Scale Button
<source lang="csharp">using System; using System.Drawing; using System.Windows.Forms; class MyClass: Form {
[STAThread]
public static void Main()
{
Application.EnableVisualStyles();
Application.Run(new MyClass());
}
public MyClass()
{
ClientSize = new Size(240, 80);
Button btn = new Button();
btn.Parent = this;
btn.Text = "good!";
btn.Size = new Size(17 * 4, 14);
btn.Location = new Point((ClientSize.Width - btn.Width) / 2,
(ClientSize.Height - btn.Height) / 2);
AutoScaleDimensions = new Size(4, 8);
AutoScaleMode = AutoScaleMode.Font;
}
}</source>
Button Background Color
<source lang="csharp">using System; using System.Drawing; using System.Windows.Forms; public class ButtonBackColor : Form {
Button btn;
public ButtonBackColor()
{
Text = "Button Properties";
Size = new Size(300,200);
btn = new Button();
btn.Parent = this;
btn.Text = "text";
btn.Location = new Point(10,10);
btn.BackColor = Color.LightGreen;
f(btn);
}
static void Main()
{
Application.Run(new ButtonBackColor());
}
private void f(Button btn)
{
int xSize = 100;
int ySize = 100;
btn.Size = new Size(xSize, ySize);
}
}</source>
Button Flat Style
<source lang="csharp">using System; using System.Drawing; using System.Windows.Forms; public class ButtonFlatStyle : Form {
Button btn;
int i = 1;
FlatStyle[] flatStyles;
Image img;
public ButtonFlatStyle()
{
Text = "Button Properties";
Size = new Size(300,200);
img = Image.FromFile("YourFile.bmp");
btn = new Button();
btn.Parent = this;
btn.Text = btn.FlatStyle.ToString();
btn.Location = new Point(10,10);
btn.Click += new System.EventHandler(btn_Click);
btn.Image = img;
ButtonSize(btn);
FlatStyle theEnum = new FlatStyle();
flatStyles = (FlatStyle[])Enum.GetValues(theEnum.GetType());
}
static void Main()
{
Application.Run(new ButtonFlatStyle());
}
private void btn_Click(object sender, EventArgs e)
{
Button btn = (Button)sender;
btn.FlatStyle = flatStyles[i];
btn.Text = btn.FlatStyle.ToString();
ButtonSize(btn);
if (i < flatStyles.Length - 1)
i++;
else
i = 0;
}
private void ButtonSize(Button btn)
{
int xSize = ((int)(Font.Height * .75) * btn.Text.Length) + (img.Width * 2);
int ySize = img.Height * 2;
btn.Size = new Size(xSize, ySize);
}
}</source>
Button Image
<source lang="csharp">using System; using System.Drawing; using System.Windows.Forms; public class ButtonImage : Form {
Button btn;
Image img;
public ButtonImage()
{
Text = "Button Properties";
Size = new Size(300,200);
img = Image.FromFile("YourFile.bmp");
btn = new Button();
btn.Parent = this;
btn.Text = "test";
btn.Location = new Point(10,10);
btn.Image = img;
ButtonSize(btn);
}
static void Main()
{
Application.Run(new ButtonImage());
}
private void ButtonSize(Button btn)
{
int xSize = 100;
int ySize = 100;
btn.Size = new Size(xSize, ySize);
}
}</source>
Button mouse event
<source lang="csharp">using System; using System.Collections.Generic; using System.ruponentModel; using System.Data; using System.Drawing; using System.Windows.Forms; partial class Form1 : Form {
public Form1()
{
InitializeComponent();
}
private void button1_MouseEnter(object sender, EventArgs e)
{
button1.Text = "The mouse is over me";
}
private void button1_MouseLeave(object sender, EventArgs e)
{
button1.Text = "The mouse is not over me";
}
private void button1_Click(object sender, EventArgs e)
{
Button clickedButton = sender as Button;
if (clickedButton != null)
{
clickedButton.Text = "I was clicked";
}
}
} partial class Form1 {
private void InitializeComponent()
{
this.button1 = new System.Windows.Forms.Button();
this.button2 = new System.Windows.Forms.Button();
this.SuspendLayout();
//
// button1
//
this.button1.Location = new System.Drawing.Point(86, 89);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(172, 86);
this.button1.TabIndex = 0;
this.button1.Text = "button1";
this.button1.MouseLeave += new System.EventHandler(this.button1_MouseLeave);
this.button1.Click += new System.EventHandler(this.button1_Click);
this.button1.MouseEnter += new System.EventHandler(this.button1_MouseEnter);
//
// button2
//
this.button2.Location = new System.Drawing.Point(69, 25);
this.button2.Name = "button2";
this.button2.Size = new System.Drawing.Size(75, 23);
this.button2.TabIndex = 1;
this.button2.Text = "button2";
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 15);
this.ClientSize = new System.Drawing.Size(292, 266);
this.Controls.Add(this.button2);
this.Controls.Add(this.button1);
this.Name = "Form1";
this.Text = "Form1";
this.ResumeLayout(false);
}
private System.Windows.Forms.Button button1;
private System.Windows.Forms.Button button2;
} public class ButtonMouseEvent {
[STAThread]
static void Main()
{
Application.Run(new Form1());
}
}</source>
Button PerformClick Method
<source lang="csharp">using System; using System.Drawing; using System.Windows.Forms; public class ButtonEvent : Form {
Button btn1;
Button btn2;
public ButtonEvent()
{
Size = new Size(200,100);
btn1 = new Button();
btn1.Parent = this;
btn1.Text = "Button1";
btn1.Location = new Point(10,10);
btn1.Click += new System.EventHandler(btn1_Click);
btn2 = new Button();
btn2.Parent = this;
btn2.Text = "Button2";
btn2.Location = new Point(100,10);
btn2.Click += new System.EventHandler(btn2_Click);
}
static void Main()
{
Application.Run(new ButtonEvent());
}
private void btn1_Click(object sender, EventArgs e)
{
MessageBox.Show("Button1 clicked.");
btn2.PerformClick();
}
private void btn2_Click(object sender, EventArgs e)
{
MessageBox.Show("Button2 clicked.");
}
}</source>
Button Style: image button, standard button
<source lang="csharp">using System; using System.Drawing; using System.Collections; using System.ruponentModel; using System.Windows.Forms; using System.Data; public class ButtonStyle : System.Windows.Forms.Form {
private System.ruponentModel.Container components = null;
private System.Windows.Forms.Button btnImage;
private System.Windows.Forms.Button btnStandard;
private System.Windows.Forms.Button btnPopup;
private System.Windows.Forms.Button btnFlat;
// Hold the current text alignment
ContentAlignment currAlignment = ContentAlignment.MiddleCenter;
int currEnumPos = 0;
public ButtonStyle()
{
InitializeComponent();
// Set btnStandard as default accept.
this.AcceptButton = btnStandard;
CenterToScreen();
}
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
#region Windows Form Designer generated code
private void InitializeComponent()
{
this.btnStandard = new System.Windows.Forms.Button();
this.btnFlat = new System.Windows.Forms.Button();
this.btnImage = new System.Windows.Forms.Button();
this.btnPopup = new System.Windows.Forms.Button();
this.SuspendLayout();
//
// btnStandard
//
this.btnStandard.Font = new System.Drawing.Font("Microsoft Sans Serif", 12F);
this.btnStandard.ForeColor = System.Drawing.SystemColors.ControlText;
this.btnStandard.Location = new System.Drawing.Point(16, 80);
this.btnStandard.Name = "btnStandard";
this.btnStandard.Size = new System.Drawing.Size(312, 88);
this.btnStandard.TabIndex = 2;
this.btnStandard.Text = "I am a standard button";
this.btnStandard.Click += new System.EventHandler(this.btnStandard_Click);
//
// btnFlat
//
this.btnFlat.FlatStyle = System.Windows.Forms.FlatStyle.Flat;
this.btnFlat.ForeColor = System.Drawing.Color.Blue;
this.btnFlat.Location = new System.Drawing.Point(16, 24);
this.btnFlat.Name = "btnFlat";
this.btnFlat.Size = new System.Drawing.Size(152, 32);
this.btnFlat.TabIndex = 0;
this.btnFlat.Text = "I am flat...";
//
// btnImage
//
this.btnImage.BackgroundImage = new Bitmap("YourFile.bmp");
this.btnImage.Font = new System.Drawing.Font("Microsoft Sans Serif", 20F, System.Drawing.FontStyle.Bold);
this.btnImage.ForeColor = System.Drawing.Color.Black;
this.btnImage.Location = new System.Drawing.Point(16, 192);
this.btnImage.Name = "btnImage";
this.btnImage.Size = new System.Drawing.Size(312, 72);
this.btnImage.TabIndex = 3;
this.btnImage.Text = "Image Button";
this.btnImage.TextAlign = System.Drawing.ContentAlignment.TopCenter;
//
// btnPopup
//
this.btnPopup.FlatStyle = System.Windows.Forms.FlatStyle.Popup;
this.btnPopup.ForeColor = System.Drawing.SystemColors.ControlText;
this.btnPopup.Location = new System.Drawing.Point(176, 24);
this.btnPopup.Name = "btnPopup";
this.btnPopup.Size = new System.Drawing.Size(152, 32);
this.btnPopup.TabIndex = 1;
this.btnPopup.Text = "I am a Popup!";
//
// ButtonStyle
//
this.AcceptButton = this.btnStandard;
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(340, 269);
this.Controls.Add(this.btnImage);
this.Controls.Add(this.btnStandard);
this.Controls.Add(this.btnPopup);
this.Controls.Add(this.btnFlat);
this.ForeColor = System.Drawing.SystemColors.ActiveCaptionText;
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.Fixed3D;
this.Name = "ButtonStyle";
this.Text = "Buttons";
this.ResumeLayout(false);
}
#endregion
protected void btnStandard_Click (object sender, System.EventArgs e)
{
Array values = Enum.GetValues(currAlignment.GetType());
currEnumPos++;
if(currEnumPos >= values.Length)
currEnumPos = 0;
currAlignment = (ContentAlignment)ContentAlignment.Parse(currAlignment.GetType(), values.GetValue(currEnumPos).ToString());
btnStandard.TextAlign = currAlignment;
btnStandard.Text = currAlignment.ToString();
btnImage.ImageAlign = currAlignment;
}
[STAThread]
public static void Main(string[] args)
{
Application.Run(new ButtonStyle());
}
}</source>
Button Text Alignment
<source lang="csharp">using System; using System.Drawing; using System.Windows.Forms; public class ButtonTextAlign : Form {
Button btn;
public ButtonTextAlign()
{
Text = "Button Properties";
Size = new Size(300,200);
btn = new Button();
btn.Parent = this;
btn.Text = "text";
btn.Location = new Point(10,10);
btn.BackColor = Color.LightGreen;
btn.TextAlign = ContentAlignment.MiddleLeft;
f(btn);
}
static void Main()
{
Application.Run(new ButtonTextAlign());
}
private void f(Button btn)
{
int xSize = 100;
int ySize = 100;
btn.Size = new Size(xSize, ySize);
}
}</source>
Calculate Button size based on its Text
<source lang="csharp">using System; using System.Drawing; using System.Windows.Forms; public class ButtonSize : Form {
Button btn;
public ButtonSize()
{
Text = "Button Properties";
Size = new Size(300,200);
btn = new Button();
btn.Parent = this;
btn.Text = "text";
btn.Location = new Point(10,10);
f(btn);
}
static void Main()
{
Application.Run(new ButtonSize());
}
private void f(Button btn)
{
int xSize = 100;
int ySize = 100;
btn.Size = new Size(xSize, ySize);
}
}</source>
Device Independent Button
<source lang="csharp">using System; using System.Drawing; using System.Windows.Forms; class MyClass: Form {
[STAThread]
public static void Main()
{
Application.Run(new MyClass());
}
public MyClass()
{
int fontHeight = Font.Height;
ClientSize = new Size(fontHeight * 30, fontHeight * 10);
Button btn = new Button();
btn.Parent = this;
btn.Text = "Button";
btn.Size = new Size(17 * fontHeight / 2, 7 * fontHeight / 4);
btn.Location = new Point((ClientSize.Width - btn.Width) / 2,
(ClientSize.Height - btn.Height) / 2);
}
}</source>
extends Button
<source lang="csharp">using System; using System.Drawing; using System.Windows.Forms; class MessageButtonDemo: Form {
[STAThread]
public static void Main()
{
Application.Run(new MessageButtonDemo());
}
public MessageButtonDemo()
{
MessageButton msgbtn = new MessageButton();
msgbtn.Parent = this;
msgbtn.Text = "Calculate";
msgbtn.MessageBoxText = "This button is not yet implemented!";
msgbtn.Location = new Point(50, 50);
msgbtn.AutoSize = true;
}
} class MessageButton: Button {
string str;
public MessageButton()
{
Enabled = false;
}
public string MessageBoxText
{
set
{
str = value;
Enabled = value != null && value.Length > 3;
}
get
{
return str;
}
}
protected override void OnClick(EventArgs args)
{
MessageBox.Show(MessageBoxText, Text);
}
}</source>
Handle button messages
<source lang="csharp">using System; using System.Windows.Forms; using System.Drawing;
class ButtonEventForm : Form {
Button MyButton = new Button();
public ButtonEventForm() {
Text = "Respond to a Button";
MyButton = new Button();
MyButton.Text = "Press Here";
MyButton.Location = new Point(100, 200);
// Add button event handler to list.
MyButton.Click += MyButtonClick;
Controls.Add(MyButton);
}
[STAThread]
public static void Main() {
ButtonEventForm skel = new ButtonEventForm();
Application.Run(skel);
}
// Handler for MyButton.
protected void MyButtonClick(object who, EventArgs e) {
Console.WriteLine("action.");
}
}</source>
Relocate button after pressing button
<source lang="csharp">using System; using System.Windows.Forms; using System.Drawing;
class ButtonEventFormLocation : Form {
Button MyButton = new Button();
public ButtonEventFormLocation() {
Text = "Respond to a Button";
MyButton = new Button();
MyButton.Text = "Press Here";
MyButton.Location = new Point(100, 200);
// Add button event handler to list.
MyButton.Click += MyButtonClick;
Controls.Add(MyButton);
}
[STAThread]
public static void Main() {
ButtonEventFormLocation skel = new ButtonEventFormLocation();
Application.Run(skel);
}
// Handler for MyButton.
protected void MyButtonClick(object who, EventArgs e) {
if(MyButton.Top == 200)
MyButton.Location = new Point(10, 10);
else
MyButton.Location = new Point(100, 200);
}
}</source>
Set Label text in a button click event
<source lang="csharp">using System; using System.Drawing; using System.Collections; using System.ruponentModel; using System.Windows.Forms; using System.Data; public class ButtonActionSetLabelTextBox : System.Windows.Forms.Form {
private System.Windows.Forms.Label label1;
private System.Windows.Forms.TextBox textBox1;
private System.Windows.Forms.Button button1;
private System.ruponentModel.Container components = null;
public ButtonActionSetLabelTextBox()
{
InitializeComponent();
}
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
#region Windows Form Designer generated code
private void InitializeComponent()
{
this.label1 = new System.Windows.Forms.Label();
this.textBox1 = new System.Windows.Forms.TextBox();
this.button1 = new System.Windows.Forms.Button();
this.SuspendLayout();
this.label1.Location = new System.Drawing.Point(32, 24);
this.label1.Name = "label1";
this.label1.TabIndex = 0;
this.label1.Text = "Hello World";
this.textBox1.Location = new System.Drawing.Point(24, 128);
this.textBox1.Name = "textBox1";
this.textBox1.TabIndex = 1;
this.textBox1.Text = "";
this.button1.Location = new System.Drawing.Point(24, 168);
this.button1.Name = "button1";
this.button1.TabIndex = 2;
this.button1.Text = "Say hello";
this.button1.Click += new System.EventHandler(this.button1_Click);
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(292, 266);
this.Controls.AddRange(new System.Windows.Forms.Control[] {this.button1,
this.textBox1,
this.label1});
this.Name = "ButtonActionSetLabelTextBox";
this.Text = "ButtonActionSetLabelTextBox";
this.ResumeLayout(false);
}
#endregion
[STAThread]
static void Main()
{
Application.Run(new ButtonActionSetLabelTextBox());
}
private void button1_Click(object sender, System.EventArgs e)
{
label1.Text = "Hello " + textBox1.Text;
}
}</source>
Use delegate to add an event handler to a Button
<source lang="csharp">using System; using System.Drawing; using System.Windows.Forms; public class ButtonEventDelegate : System.Windows.Forms.Form {
private Button btn;
public ButtonEventDelegate()
{
Text = "Hello World";
btn = new Button();
btn.Location = new Point(50,50);
btn.Text = "Goodbye";
btn.Click += new System.EventHandler(btn_Click);
Controls.Add(btn);
}
static void Main()
{
Application.Run(new ButtonEventDelegate());
}
private void btn_Click(object sender, EventArgs e)
{
Application.Exit();
}
}</source>
