Netbeans/C2/Handling-Images-in-a-Java-GUI-Application/English-timed

Time	Narration
00:01	Hi everyone.
00:02	Welcome to this tutorial on Handling Images in a Java GUI Application using Netbeans IDE.
00:10	We assume that you have the basic working knowledge of Netbeans.
00:15	We also assume that you know to place text fields, buttons, menus etc. on a JFrame form.
00:22	If not, then please visit the Spoken Tutorial website for relevant tutorials on Netbeans.
00:29	In this tutorial, we will learn in detail about handling images
00:34	and perform actions on them, in a sample GUI application.
00:39	For this demonstration, I am using the Linux Operating System Ubuntu version 11.04 and Netbeans IDE version 7.1.1.
00:52	The standard way to handle and access images in a Java Application is by using the 'getResource()' method.
00:59	We will learn how to use the IDE's GUI Builder to generate the code, to include images in your application
01:07	and create a simple Jframe with one Jlabel displaying an image.
01:13	In this tutorial, we will -
01:15	* Create the application form
01:18	* Add a package for the image
01:20	* Display the image on the Label
01:22	* Create mouse-events and pop-ups
01:25	* Build and run the application.
01:28	Now, let us switch to the IDE to create our sample application.
01:33	From the File menu, choose New Project.
01:37	Under Categories , select "Java"; under Projects select "Java Application" and click Next.
01:46	In the Project Name field, type: "ImageDisplayApp".
01:54	Clear the Create Main Class check-box.
01:58	Make sure that the Set as Main Project check-box is selected.
02:03	Click Finish. The project is created in your IDE.
02:08	In this section, we will create the Jframe form and add a Jlabel to the form.
02:14	Let us first create the Jframe form.
02:17	In the Projects window, expand the ImageDisplayApp node.
02:23	Right-click on the Source Packages node and choose New >> Jframe Form.
02:30	In the Class Name field, type: "ImageDisplay".
02:37	In the Package field, type: "org.me.myimageapp"
02:45	and click Finish.
02:48	Now, let us add the Jlabel.
02:52	In the Palette, on the right hand side of the IDE, select the Label component and drag it to the Jframe.
03:01	For now, your form should look something like this.
03:06	When you use images or other resources in an application, typically you create a separate Java package for the resource.
03:15	On your local file system, a package corresponds with a folder.
03:19	In the Projects window, right-click the org.me.myimageapp node and choose New > Java Package.
03:30	In the New Package Wizard, add '.resources' to 'org.me.myimageapp'.
03:40	So, the new package is now called 'org.me.myimageapp.resources'.
03:47	Click Finish.
03:49	In the Projects window, you should see the image appear within the org.me.myimageapp.resources package, when you add the image.
03:59	In this application, the image will be embedded within a Jlabel component.
04:04	Let us now add the image to the label.
04:08	In the GUI designer, select the label that you have added to your form.
04:14	In the Properties window, below the Palette, on the right hand side of the window, scroll down to the icon property.
04:23	Click the ellipsis (...) or the three dots on the right side.
04:30	In the icon Property dialog-box, click Import to Project.
04:34	In the file chooser, navigate to the folder that contains your image that you want to use.
04:42	Click Next.
04:45	In the Select target folder page of the wizard, select the resources folder
04:49	and click Finish.
04:52	After you click Finish, the IDE copies the image to your project.
04:57	Therefore, when you build and run the application, the image is included in the distributable JAR file.
05:07	Click OK here.
05:11	And right-click on your project node and select Clean and Build option.
05:18	You can now go to the Files menu and under the build folder,
05:29	under dist folder, you can see the jar file.
05:33	It generates the code in the 'imagedisplay' class to access the image.
05:38	It also displays your image on the label in the Design view of your form.
05:43	At this point, you can do some simple things to improve the appearance of the form.
05:48	In the Properties window, select the Text property
05:56	and delete jLabel1.
06:04	That value was generated by the GUI Builder as display text for the label.
06:10	However, you are using the label to display an image rather than text.
06:15	So, this text is not needed.
06:18	Now, let us drag the label to center it on the form.
06:26	In the GUI Designer, click the Source tab.
06:30	Scroll down to the line that says Generated Code.
06:33	And click the plus sign (+) to the left of the Generated Code line, to display the code that the GUI Designer has generated.
06:42	Here, the keyline is this.
06:49	Since you have used the Property editor for jLabel1s icon property, the IDE has generated the setIcon method.
06:57	The parameter of that method contains a call to the getResource() method on an anonymous inner class of ImageIcon.
07:10	Once your image has been added, in the Design view right-click on the image.
07:19	Click on Events > Mouse > mouseClicked.
07:24	The view is switched to the Source mode.
07:28	Here you can add the code to customize your action on a mouse-click.
07:33	Let me add a few lines of code to generate a pop-up when the image is clicked in the GUI.
08:00	I have now entered a few lines of code to generate the pop-up.
08:05	First, I have created a new Jframe for the pop-up.
08:12	And I have set the defaultCloseOperation.
08:15	And finally provided the text for the pop-up.
08:24	After adding these lines of code, let us import the necessary packages by adding two statements at the beginning of the file.
08:36	Include: import javax.swing.*;
08:45	and import java.awt.*;
08:53	This will import the necessary packages required for this program.
08:59	Let us now build and run the application.
09:02	We have generated the code for accessing and displaying the image.
09:07	Let us build and run the application to ensure that the image is accessed.
09:12	First, we need to set the project's Main class.
09:16	When you set the Main class, the IDE knows which class to run when you run the project.
09:21	In addition, this ensures that the Main class element in the application's JAR file is generated when you build the application.
09:33	Here, right-click on the ImageDisplayApp project's Node in the Projects window and choose Properties.
09:41	In the Project Properties dialog-box, select the Run category on the left side.
09:47	Click the Browse button, that is next to the Main Class field.
09:51	Select org.me.myimageapp.ImageDisplay and click on Select Main Class
10:01	Say OK here.
10:05	Now, right-click on the Project node and select Clean & Build.
10:11	You can view the Build properties of the application in the Files window.
10:20	The Build folder contains the compiled class.
10:23	The dist folder contains an executable JAR file that contains the compiled class and the image.
10:32	Now choose Run from the tool bar.
10:34	Our output window opens with the image.
10:39	I will click on this image now.
10:42	And you can see the pop-up at the top which shows the description of the image.
10:50	Now, time for the assignment!
10:54	Create another GUI with four images, similar to the demonstration shown in this tutorial.
11:01	For each of the images, specify different events such as keyboard event, mouse-motion event, mouse-click event, mouse-wheel event.
11:12	I have already created the assignment.
11:17	Let us run the assignment project.
11:20	Your assignment should look similar to this.
11:26	I have created keyboard-events and mouse-events for my assignment here.
11:34	So, to summarize-
11:36	we have created a Jframe form,
11:39	added a package for the image,
11:41	displayed the image on the label,
11:44	and also created mouse-events and pop-ups.
11:49	Watch the video available at the link shown on the screen.
11:53	It summarizes the Spoken Tutorial project.
11:56	If you do not have good bandwidth, you can download and watch it.
12:02	The Spoken Tutorial project team: * conducts workshops using Spoken Tutorials.
12:07	* Gives certificates to those who pass an online test.
12:11	For more details, please write to: contact@spoken-tutorial.org
12:19	Spoken Tutorial project is a part of the Talk to a Teacher project.
12:23	It is supported by the National Mission on education through ICT, MHRD, Government of India.
12:30	More information on this mission is available at: spoken-tutorial.org/NMEICT-Intro.
12:42	This tutorial has been contributed by IT for Change.
12:46	Thank you for joining us.

Contributors and Content Editors

PoojaMoolya, Pratik kamble, Sandhya.np14