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Example Application: Car Inventory |
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This application is used to review a list of objects; in
this case, the objects are cars. The application uses two track bars.
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 Application:
Creating the Application
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- Start a new Windows Application named CarInventory1
- Copy the pictures
of the cars and paste them in the
CarInventory1\CarInventory1\bin\debug folder of the current project
- On the main menu, click Project -> Add Class...
- Set the Name to Car and click Add
- Create the following members of the class:
using System;
namespace CarInventory1
{
public class Car
{
public string Make;
public string Model;
public int Year;
public double Price;
public string Picture;
}
}
- Design the form as follows:
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| Control |
Text |
Name |
Additional Properties |
| GroupBox |
Car Description |
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| Label |
Make: |
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| TextBox |
Honda |
txtMake |
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| Label |
Model: |
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| TextBox |
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txtModel |
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| Label |
Year: |
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| TextBox |
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txtYear |
TextAlign: Right |
| Label |
Price: |
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| TextBox |
|
txtPrice |
TextAlign: Right |
| PictureBox |
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pbxCarImage |
SizeMode: CenterImage |
| TrackBar |
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tbrImages |
Orientation: Vertical |
| TrackBar |
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tbrReview |
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| Button |
Close |
btnClose |
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- On the form, double-click the bottom track bar
- Return to the form and double-click the right track bar
- Return to the form
- On the form, click the right track bar
- In the Properties window, click TickStyle and select Both from its
combo box
- On the form, click the bottom track bar
- In the Properties window, click TickStyle and select TopLeft from
its combo box
- Double-click an unoccupied of the form
- Return to the form and double-click the Close button
- Change the file as follows:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace CarInventory1
{
public partial class Form1 : Form
{
int ReviewPosition;
Car[] Cars = new Car[15];
// We will not use the commented arrays.
// They are only mentioned here for reference
string[] pictures0;
string[] pictures1 = new string[5];
string[] pictures2 = new string[3];
//string[] pictures3 = new string[0];
string[] pictures4 = new string[3];
string[] pictures5 = new string[3];
string[] pictures6 = new string[3];
//string[] pictures7 = new string[0];
//string[] pictures8 = new string[0];
//string[] pictures9 = new string[0];
string[] pictures10 = new string[3];
string[] pictures11 = new string[4];
//string[] pictures12 = new string[0];
string[] pictures13 = new string[7];
string[] pictures14 = new string[2];
public Form1()
{
InitializeComponent();
}
private void tbrReview_Scroll(object sender, EventArgs e)
{
// Get the index of the current value of the track bar
ReviewPosition = tbrReview.Value;
// Based on the current index, retrieve the values of the
// current car and assign each to the corresponding control
txtMake.Text = Cars[ReviewPosition].Make;
txtModel.Text = Cars[ReviewPosition].Model;
txtYear.Text = Cars[ReviewPosition].Year.ToString();
txtPrice.Text = Cars[ReviewPosition].Price.ToString();
pbxCarImage.Image = Image.FromFile(Cars[ReviewPosition].Picture);
// To make the right track bar aware of the number
// of pictures of each car, set its maximum property
// according to the number of pictures (- 1)
switch (ReviewPosition)
{
case 0:
tbrImages.Maximum = 8;
break;
case 1:
tbrImages.Maximum = 5;
break;
case 2:
tbrImages.Maximum = 3;
break;
case 3:
tbrImages.Maximum = 0;
break;
case 4:
tbrImages.Maximum = 3;
break;
case 5:
tbrImages.Maximum = 3;
break;
case 6:
tbrImages.Maximum = 3;
break;
case 7:
tbrImages.Maximum = 0;
break;
case 8:
tbrImages.Maximum = 0;
break;
case 9:
tbrImages.Maximum = 0;
break;
case 10:
tbrImages.Maximum = 3;
break;
case 11:
tbrImages.Maximum = 4;
break;
case 12:
tbrImages.Maximum = 0;
break;
case 13:
tbrImages.Maximum = 7;
break;
case 14:
tbrImages.Maximum = 1;
break;
default:
break;
}
tbrImages.Value = 0;
}
private void tbrImages_Scroll(object sender, EventArgs e)
{
// Check the position of the bottom track bar
// Then, use the value of the right track bar
// to locate the right picture
switch (ReviewPosition)
{
case 0:
pbxCarImage.Image = Image.FromFile(pictures0[tbrImages.Value]);
break;
case 1:
pbxCarImage.Image = Image.FromFile(pictures1[tbrImages.Value]);
break;
case 2:
pbxCarImage.Image = Image.FromFile(pictures2[tbrImages.Value]);
break;
case 4:
pbxCarImage.Image = Image.FromFile(pictures4[tbrImages.Value]);
break;
case 5:
pbxCarImage.Image = Image.FromFile(pictures5[tbrImages.Value]);
break;
case 6:
pbxCarImage.Image = Image.FromFile(pictures6[tbrImages.Value]);
break;
case 10:
pbxCarImage.Image = Image.FromFile(pictures10[tbrImages.Value]);
break;
case 11:
pbxCarImage.Image = Image.FromFile(pictures11[tbrImages.Value]);
break;
case 13:
pbxCarImage.Image = Image.FromFile(pictures13[tbrImages.Value]);
break;
case 14:
pbxCarImage.Image = Image.FromFile(pictures14[tbrImages.Value]);
break;
default:
break;
}
}
private void Form1_Load(object sender, EventArgs e)
{
// Create the list of cars
Cars[0] = new Car();
Cars[0].Make = "BMW";
Cars[0].Model = "335i";
Cars[0].Year = 2007;
Cars[0].Price = 42580;
Cars[0].Picture = "335iA.gif";
Cars[1] = new Car();
Cars[1].Make = "Honda";
Cars[1].Model = "Accord";
Cars[1].Year = 2007;
Cars[1].Price = 24550;
Cars[1].Picture = "Accord1.gif";
Cars[2] = new Car();
Cars[2].Make = "Chevrolet";
Cars[2].Model = "Avalanche";
Cars[2].Year = 2007;
Cars[2].Price = 36880;
Cars[2].Picture = "Avalanche1.gif";
Cars[3] = new Car();
Cars[3].Make = "Volvo";
Cars[3].Model = "C70";
Cars[3].Year = 1997;
Cars[3].Price = 42320;
Cars[3].Picture = "C70.gif";
Cars[4] = new Car();
Cars[4].Make = "Land Rover";
Cars[4].Model = "LR3";
Cars[4].Year = 2007;
Cars[4].Price = 46245;
Cars[4].Picture = "LR3a.gif";
Cars[5] = new Car();
Cars[5].Make = "Honda";
Cars[5].Model = "Civic";
Cars[5].Year = 2000;
Cars[5].Price = 22665;
Cars[5].Picture = "Civic1.gif";
Cars[6] = new Car();
Cars[6].Make = "Mazda";
Cars[6].Model = "Mazda5";
Cars[6].Year = 2007;
Cars[6].Price = 20845;
Cars[6].Picture = "Mazda5a.gif";
Cars[7] = new Car();
Cars[7].Make = "Ford";
Cars[7].Model = "Escape";
Cars[7].Year = 1997;
Cars[7].Price = 22445;
Cars[7].Picture = "Escape.gif";
Cars[8] = new Car();
Cars[8].Make = "Acura";
Cars[8].Model = "TSX";
Cars[8].Year = 2006;
Cars[8].Price = 26445;
Cars[8].Picture = "TSX.gif";
Cars[9] = new Car();
Cars[9].Make = "Mazda";
Cars[9].Model = "Miata";
Cars[9].Year = 2008;
Cars[9].Price = 24180;
Cars[9].Picture = "Miata.gif";
Cars[10] = new Car();
Cars[10].Make = "Ford";
Cars[10].Model = "F-150";
Cars[10].Year = 2006;
Cars[10].Price = 20475;
Cars[10].Picture = "F150a.gif";
Cars[11] = new Car();
Cars[11].Make = "Volvo";
Cars[11].Model = "S40";
Cars[11].Year = 2008;
Cars[11].Price = 25285;
Cars[11].Picture = "S40a.gif";
Cars[12] = new Car();
Cars[12].Make = "BMW";
Cars[12].Model = "750i";
Cars[12].Year = 2007;
Cars[12].Price = 88925;
Cars[12].Picture = "750Li.gif";
Cars[13] = new Car();
Cars[13].Make = "Buick";
Cars[13].Model = "LaCrosse";
Cars[13].Year = 2002;
Cars[13].Price = 28685;
Cars[13].Picture = "LaCrosse1.gif";
Cars[14] = new Car();
Cars[14].Make = "Ford";
Cars[14].Model = "E-150 XL";
Cars[14].Year = 2002;
Cars[14].Price = 26660;
Cars[14].Picture = "E150XLa.gif";
// Create the list of pictures for each car
pictures0 = new string[9]
{
"335iA.gif", "335iB.gif", "335iC.gif",
"335iD.gif", "335iE.gif", "335iF.gif",
"335iG.gif", "335iH.gif", "335iI.gif"
};
pictures1 = new string[]
{
"Accord1.gif", "Accord2.gif", "Accord3.gif",
"Accord4.gif", "Accord5.gif", "Accord6.gif"
};
pictures2 = new string[]
{
"Avalanche1.gif", "Avalanche2.gif",
"Avalanche3.gif", "Avalanche4.gif"
};
pictures4 = new string[]
{
"LR3a.gif", "LR3b.gif",
"LR3b.gif", "LR3d.gif"
};
pictures5 = new string[]
{
"Civic1.gif", "Civic2.gif",
"Civic3.gif", "Civic4.gif"
};
pictures6 = new string[]
{
"Mazda5a.gif", "Mazda5b.gif",
"Mazda5c.gif", "Mazda5d.gif"
};
pictures10 = new string[]
{
"F150a.gif", "F150b.gif",
"F150c.gif", "F150d.gif"
};
pictures11 = new string[]
{
"S40a.gif", "S40b.gif",
"S40c.gif", "S40d.gif", "S40e.gif"
};
pictures13 = new string[]
{
"LaCrosse1.gif", "LaCrosse2.gif", "LaCrosse3.gif",
"LaCrosse4.gif", "LaCrosse5.gif", "LaCrosse6.gif",
"LaCrosse7.gif", "LaCrosse8.gif"
};
pictures14 = new string[]
{
"E150XLa.gif", "E150XLb.gif"
};
// Call the Scroll event of the bottom track bar
// as if it had been scrolled
tbrReview_Scroll(sender, e);
}
private void btnClose_Click(object sender, EventArgs e)
{
// Close the application
Close();
}
}
}
- Execute the application and test the track bar:
- Close the form and return to your programming environment
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