Hello,
I am new to gwt. I found out that gwt is abstracted like a desktop gui
framework where we replace panels in frames to switch screens. From
showcase example, though it was quite complex, I was able to
understand that we might use Composite derived classes as screens and
use a SimplePanel as container. And that we have to call initWidget as
last statement in constructor of Composite derived classes. So, did
something like this but it doesnt work. I am pasting my code here.
What am I missing? Thanks.
///////////////////// Application Class //////////////////////
public class Application implements EntryPoint {
private VerticalPanel mainPanel;
private Grid logo_and_linksBar_grd;
private SimplePanel widgetContainer_sp;
private HorizontalPanel miscLinks_hp;
private Hyperlink about_hl;
private DialogBox aboutDialogBox;
private static Application applicationInstance;
public static Application getAplplicationInstance(){
return applicationInstance;
}
public void onModuleLoad() {
applicationInstance=this;
mainPanel = new VerticalPanel();
mainPanel.setWidth("100%");
logo_and_linksBar_grd = new Grid(1, 2);
logo_and_linksBar_grd.setWidth("100%");
widgetContainer_sp = new SimplePanel();
widgetContainer_sp.setWidth("100%");
miscLinks_hp = new HorizontalPanel();
miscLinks_hp.setHorizontalAlignment
(HasHorizontalAlignment.ALIGN_RIGHT);
miscLinks_hp.setSpacing(5);
about_hl = new Hyperlink("About", "About");
about_hl.addClickListener(new ClickListener() {
public void onClick(Widget sender) {
aboutClick();
}
});
miscLinks_hp.add(about_hl);
logo_and_linksBar_grd.setText(0, 0, "logo here");
logo_and_linksBar_grd.setWidget(0, 1, miscLinks_hp);
logo_and_linksBar_grd.getCellFormatter().
setHorizontalAlignment(0, 1,
HasHorizontalAlignment.ALIGN_RIGHT);
mainPanel.add(logo_and_linksBar_grd);
mainPanel.add(widgetContainer_sp);
RootPanel.get().add(mainPanel);
setContent(LoginApplicationContent.getInstance());
}
private void aboutClick() {
if (aboutDialogBox == null) {
aboutDialogBox = new DialogBox(true, true);
aboutDialogBox.setText("About");
aboutDialogBox.add(new Label("Some thing"));
}
aboutDialogBox.center();
}
public void setContent(ApplicationContent content) {
if (widgetContainer_sp.getWidget() != null) {
widgetContainer_sp.remove(widgetContainer_sp.getWidget());
}
widgetContainer_sp.setWidget(content);
}
}
///////////////////// ApplicationContent Class //////////////////////
abstract class ApplicationContent extends Composite {
}
///////////////////// LoginApplicationContent
Class //////////////////////
public class LoginApplicationContent extends ApplicationContent {
private static LoginApplicationContent loginpage;
public static LoginApplicationContent getInstance() {
if(loginpage==null)
{
loginpage=new LoginApplicationContent();
}
return loginpage;
}
private VerticalPanel mainPanel_vp;
private HorizontalPanel loginControls_hp;
private VerticalPanel login_vp;
private Label error_lb;
private Grid userNamePassword_grd;
private TextBox userName_tb;
private PasswordTextBox password_tb;
private CheckBox remember_cb;
private Button signIn_btn;
private VerticalPanel introSignUp_vp;
private Button signUp_btn;
private LoginApplicationContent() {
mainPanel_vp = new VerticalPanel();
loginControls_hp = new HorizontalPanel();
login_vp = new VerticalPanel();
error_lb = new Label();
userNamePassword_grd = new Grid(2, 2);
userName_tb = new TextBox();
password_tb = new PasswordTextBox();
remember_cb = new CheckBox("Remember Me");
signIn_btn = new Button("Sign In");
signUp_btn = new Button("Sign Up");
introSignUp_vp = new VerticalPanel();
userNamePassword_grd.setCellSpacing(3);
userNamePassword_grd.setText(0, 0, "User Name:");
userNamePassword_grd.setWidget(0, 1, userName_tb);
userNamePassword_grd.setText(1, 0, "Password:");
userNamePassword_grd.setWidget(1, 1, password_tb);
login_vp.setHorizontalAlignment
(HasHorizontalAlignment.ALIGN_CENTER);
login_vp.setVerticalAlignment
(HasVerticalAlignment.ALIGN_MIDDLE);
login_vp.add(error_lb);
login_vp.add(userNamePassword_grd);
login_vp.add(remember_cb);
login_vp.add(signIn_btn);
introSignUp_vp.setHorizontalAlignment
(HasHorizontalAlignment.ALIGN_CENTER);
introSignUp_vp.setVerticalAlignment
(HasVerticalAlignment.ALIGN_MIDDLE);
introSignUp_vp.add(new Label("Note:"));
introSignUp_vp.add(signUp_btn);
loginControls_hp.setHorizontalAlignment
(HasHorizontalAlignment.ALIGN_CENTER);
loginControls_hp.add(login_vp);
loginControls_hp.add(introSignUp_vp);
loginControls_hp.setCellWidth(login_vp, "50%");
loginControls_hp.setCellWidth(introSignUp_vp, "50%");
loginControls_hp.setWidth("100%");
mainPanel_vp.setHorizontalAlignment
(HasHorizontalAlignment.ALIGN_CENTER);
mainPanel_vp.setVerticalAlignment
(HasVerticalAlignment.ALIGN_MIDDLE);
mainPanel_vp.add(loginControls_hp);
mainPanel_vp.setWidth("100%");
initWidget(mainPanel_vp);
userName_tb.setFocus(true);
}
private void signIn_Clicked() {
String varify_UserName = userName_tb.getText().trim();
if (varify_UserName.matches("^[0-9a-zA-Z]{1,15}$")) {
password_tb.setText(userName_tb.getText());
return;
}
Window.alert("'" + varify_UserName + "' is not valid");
userName_tb.selectAll();
}
private void signUp_Clicked() {
Application.getAplplicationInstance().setContent
(SignUpApplicationContent.getInstance());
}
}
///////////////////// SignUpApplicationContent
Class //////////////////////
public class SignUpApplicationContent extends ApplicationContent{
private VerticalPanel mainPanel_vp;
private Grid userInput_grd;
private TextBox userName_tb;
private PasswordTextBox password_tb;
private PasswordTextBox confirmPassword_tb;
private TextBox displayName_tb;
private TextBox email_tb;
private TextBox confirmEmail_tb;
private TextBox firstName_tb;
private TextBox lastName_tb;
private ListBox country_listbox;
private TextBox dob_tb;
private TextBox qualification_tb;
private Label userName_lb;
private Label password_lb;
private Label confirmPassword_lb;
private Label displayName_lb;
private Label email_lb;
private Label confirmEmail_lb;
private Label firstName_lb;
private Label lastName_lb;
private Label country_lb;
private Label dob_lb;
private Label qualification_lb;
private RadioButton male_rb;
private RadioButton female_rb;
private Button ok_btn;
private Button cancel_btn;
private HorizontalPanel button_hp;
private CheckBox iAccept_cb;
private static SignUpApplicationContent signUpPage;
public static SignUpApplicationContent getInstance(){
if(signUpPage==null)
{
signUpPage=new SignUpApplicationContent();
}
return signUpPage;
}
private SignUpApplicationContent() {
userInput_grd=new Grid(12, 3);
userInput_grd.setBorderWidth(1);
mainPanel_vp=new VerticalPanel();
mainPanel_vp.setBorderWidth(1);
userName_tb=new TextBox();
password_tb=new PasswordTextBox();
confirmPassword_tb=new PasswordTextBox();
displayName_tb=new TextBox();
email_tb=new TextBox();
confirmEmail_tb=new TextBox();
firstName_tb=new TextBox();
lastName_tb=new TextBox();
country_listbox=new ListBox(false);
dob_tb=new TextBox();
qualification_tb=new TextBox();
userName_lb=new Label();
password_lb=new Label();
displayName_lb=new Label();
email_lb=new Label();
firstName_lb=new Label();
lastName_lb=new Label();
country_lb=new Label();
country_listbox.setWidth("11em");
dob_lb=new Label();
qualification_lb=new Label();
male_rb=new RadioButton("gender", "Male");
female_rb=new RadioButton("gender", "Female");
male_rb.setChecked(true);
ok_btn=new Button("OK");
ok_btn.setWidth("50");
cancel_btn=new Button("Cancel");
cancel_btn.setWidth("50");
button_hp=new HorizontalPanel();
iAccept_cb=new CheckBox("I Accept all terms and conditions");
button_hp.setBorderWidth(1);
button_hp.setSpacing(10);
button_hp.add(ok_btn);
button_hp.add(cancel_btn);
button_hp.setHorizontalAlignment
(HasHorizontalAlignment.ALIGN_CENTER);
button_hp.setBorderWidth(1);
userInput_grd.setCellSpacing(10);
userInput_grd.setText(0, 0, "User Name");
userInput_grd.setWidget(0, 1, userName_tb);
//userInput_grd.setWidget(0, 2, userName_lb);
userInput_grd.setText(1, 0, "Password");
userInput_grd.setWidget(1, 1, password_tb);
//userInput_grd.setWidget(1, 2, password_lb);
userInput_grd.setText(2, 0, "Confirm Password");
userInput_grd.setWidget(2, 1, confirmPassword_tb);
//userInput_grd.setWidget(2, 2, confirmPassword_lb);
userInput_grd.setText(3, 0, "Display Name");
userInput_grd.setWidget(3, 1,displayName_tb );
//userInput_grd.setWidget(3, 2, displayName_lb);
userInput_grd.setText(4, 0, "Email");
userInput_grd.setWidget(4, 1, email_tb);
//userInput_grd.setWidget(4, 2, email_lb);
userInput_grd.setText(5, 0, "Confirm Email");
userInput_grd.setWidget(5, 1, confirmEmail_tb);
//userInput_grd.setWidget(5, 2, confirmEmail_lb);
userInput_grd.setText(6, 0, "First Name");
userInput_grd.setWidget(6, 1, firstName_tb);
//userInput_grd.setWidget(6, 2, firstName_lb);
userInput_grd.setText(7, 0, "Last Name");
userInput_grd.setWidget(7, 1, lastName_tb);
//userInput_grd.setWidget(7, 2, lastName_lb);
userInput_grd.setText(8, 0, "Gender");
HorizontalPanel gender_hp = new HorizontalPanel();
gender_hp.add(male_rb);
gender_hp.add(female_rb);
userInput_grd.setWidget(8, 1, gender_hp);
userInput_grd.setText(9, 0, "Select Country");
userInput_grd.setWidget(9, 1, country_listbox);
//userInput_grd.setWidget(9, 2, country_lb);
userInput_grd.setText(10, 0, "Date of Birth");
userInput_grd.setWidget(10, 1, dob_tb);
//userInput_grd.setWidget(10, 2, dob_lb);
userInput_grd.setText(11, 0, "Qualification");
userInput_grd.setWidget(11, 1, qualification_tb);
//userInput_grd.setWidget(11, 2, qualification_lb);
mainPanel_vp.setHorizontalAlignment
(HasHorizontalAlignment.ALIGN_CENTER);
mainPanel_vp.setVerticalAlignment
(HasVerticalAlignment.ALIGN_MIDDLE);
mainPanel_vp.setWidth("100%");
mainPanel_vp.add(userInput_grd);
mainPanel_vp.add(iAccept_cb);
mainPanel_vp.add(button_hp);
initWidget(mainPanel_vp);
userName_tb.setFocus(true);
}
}
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