Text Format : Text « 2D Graphics « C# / C Sharp
Text Format
/*
GDI+ Programming in C# and VB .NET
by Nick Symmonds
Publisher: Apress
ISBN: 159059035X
*/
using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Text;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
namespace TextFormat_c
{
public class TextFormat : System.Windows.Forms.Form
{
#region Class Local Variables
Rectangle UserRect = Rectangle.Empty;
bool RectStarted = false;
bool RectFinished = false;
bool Typing = false;
bool InsideRect = false;
Cursor ClientCursor = Cursors.Default;
string RectText = string.Empty;
StringFormat BoxFormat = StringFormat.GenericDefault;
#endregion
private System.Windows.Forms.Button cmdNew;
private System.Windows.Forms.Button cmdLeft;
private System.Windows.Forms.Button cmdTop;
private System.ComponentModel.Container components = null;
public TextFormat()
{
InitializeComponent();
//All the mouse move events use the same delegate
this.cmdNew.MouseMove += new MouseEventHandler(this.Button_MouseMove);
this.cmdLeft.MouseMove += new MouseEventHandler(this.Button_MouseMove);
this.cmdTop.MouseMove += new MouseEventHandler(this.Button_MouseMove);
this.KeyPress += new KeyPressEventHandler(this.FormKeyPress);
BoxFormat.Alignment = StringAlignment.Center;
BoxFormat.LineAlignment = StringAlignment.Center;
}
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
ClientCursor.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.cmdNew = new System.Windows.Forms.Button();
this.cmdLeft = new System.Windows.Forms.Button();
this.cmdTop = new System.Windows.Forms.Button();
this.SuspendLayout();
//
// cmdNew
//
this.cmdNew.Location = new System.Drawing.Point(16, 328);
this.cmdNew.Name = "cmdNew";
this.cmdNew.Size = new System.Drawing.Size(56, 24);
this.cmdNew.TabIndex = 0;
this.cmdNew.Text = "&New";
this.cmdNew.Click += new System.EventHandler(this.cmdNew_Click);
//
// cmdLeft
//
this.cmdLeft.Location = new System.Drawing.Point(104, 328);
this.cmdLeft.Name = "cmdLeft";
this.cmdLeft.Size = new System.Drawing.Size(104, 24);
this.cmdLeft.TabIndex = 1;
this.cmdLeft.Text = "Center Left Align";
this.cmdLeft.Click += new System.EventHandler(this.cmdLeft_Click);
//
// cmdTop
//
this.cmdTop.Location = new System.Drawing.Point(248, 328);
this.cmdTop.Name = "cmdTop";
this.cmdTop.Size = new System.Drawing.Size(104, 24);
this.cmdTop.TabIndex = 2;
this.cmdTop.Text = "Top Left Align";
this.cmdTop.Click += new System.EventHandler(this.cmdTop_Click);
//
// TextFormat
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(392, 373);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.cmdTop,
this.cmdLeft,
this.cmdNew});
this.MaximizeBox = false;
this.MinimizeBox = false;
this.Name = "TextFormat";
this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
this.Text = "TextFormat";
this.Load += new System.EventHandler(this.TextFormat_Load);
this.ResumeLayout(false);
}
#endregion
[STAThread]
static void Main()
{
Application.Run(new TextFormat());
}
private void TextFormat_Load(object sender, System.EventArgs e)
{
}
protected override void OnPaint(PaintEventArgs e)
{
Graphics G = e.Graphics;
using(Pen P = new Pen(Brushes.Black, 1))
{
if ( !RectFinished )
P.DashStyle = DashStyle.Dash;
G.DrawRectangle(P,UserRect);
}
if (RectFinished && ClientCursor == Cursors.IBeam)
G.DrawString(RectText, new Font("Arial", 16), Brushes.Black,
UserRect, BoxFormat);
base.OnPaint(e);
}
protected override void OnMouseDown(MouseEventArgs e)
{
//If left button then start the rectangle
if ( e.Button == MouseButtons.Left )
{
if (UserRect == Rectangle.Empty)
{
UserRect.X = e.X;
UserRect.Y = e.Y;
RectStarted = true;
RectFinished = false;
}
}
//If right button then start the edit
else if ( e.Button == MouseButtons.Right )
{
if ( UserRect != Rectangle.Empty )
{
ClientCursor = Cursors.IBeam;
this.Cursor = ClientCursor;
Point pos = new Point(UserRect.X+UserRect.Width/2,
UserRect.Y+UserRect.Height/2);
//Translate cursor screen postion to position on form
int Offset = this.Height-this.ClientRectangle.Height;
pos += new Size(this.Location.X, this.Location.Y+Offset);
Cursor.Position = pos;
Typing = true;
this.KeyPreview = true;
}
}
base.OnMouseDown(e);
}
protected override void OnMouseUp(MouseEventArgs e)
{
base.OnMouseUp(e);
// A negative rectangle is not allowed.
// Mouse_down then Mouse_up without Mouse_move is not allowed
if (UserRect.Width <= 0 || UserRect.Height <=0 )
UserRect = Rectangle.Empty;
//Rectangle has ended
RectStarted = false;
RectFinished = true;
Invalidate();
}
protected override void OnMouseMove(MouseEventArgs e)
{
base.OnMove(e);
//Let program know if cursor is inside user rectangle
InsideRect = false;
if (UserRect != Rectangle.Empty)
if (UserRect.Contains(new Point(e.X, e.Y)))
InsideRect = true;
this.Cursor = ClientCursor;
//Increase the size of the rectangle each time the mouse moves.
if (RectStarted)
{
Size s = new Size(e.X-UserRect.X, e.Y-UserRect.Y);
UserRect.Size=s;
Invalidate();
}
}
private void cmdNew_Click(object sender, System.EventArgs e)
{
if ( Typing && InsideRect )
return;
//Start a new blank form
UserRect = Rectangle.Empty;
ClientCursor = Cursors.Default;
RectStarted = false;
RectFinished = false;
RectText = string.Empty;
this.KeyPreview=false;
Invalidate();
}
private void Button_MouseMove(object sender, MouseEventArgs e)
{
this.Cursor = Cursors.Default;
}
void FormKeyPress(object sender, KeyPressEventArgs e)
{
//Handle backspace key
if (e.KeyChar == (char)8)
{
if ( RectText != string.Empty )
RectText = RectText.Remove(RectText.Length-1, 1);
}
else
RectText += e.KeyChar;
Invalidate();
}
private void cmdLeft_Click(object sender, System.EventArgs e)
{
//Change horizontal alignement and redraw
BoxFormat.Alignment = StringAlignment.Near;
Invalidate();
}
private void cmdTop_Click(object sender, System.EventArgs e)
{
//Chnage vertical alignment and redraw
BoxFormat.LineAlignment = StringAlignment.Near;
Invalidate();
}
}
}
