import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.CLabel;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.layout.FormAttachment;
import org.eclipse.swt.layout.FormData;
import org.eclipse.swt.layout.FormLayout;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.layout.RowData;
import org.eclipse.swt.layout.RowLayout;

#import com.swtdesigner.SWTResourceManager;

class LoginDialog
  include_package org.eclipse.swt.graphics;
  include_package org.eclipse.swt.widgets;

  def initialize(display)
    @display = display
  end

  def createContents
    #Shell must be created with style SWT::NO_TRIM
    shell = Shell.new(@display, SWT::NO_TRIM | SWT::ON_TOP)
    fillLayout = FillLayout.new;
    fillLayout.marginHeight = 1;
    shell.setLayout(fillLayout);

    #Create a composite with grid layout.
    composite = Composite.new(shell, SWT::NONE);
    gridLayout = GridLayout.new();
    gridLayout.numColumns = 2;
    gridLayout.marginHeight = 0;
    gridLayout.verticalSpacing = 0;
    gridLayout.marginWidth = 0;
    gridLayout.horizontalSpacing = 0;
    composite.setLayout(gridLayout);

    #Setting the background of the composite
    #with the image background for login dialog
#    img_Label = Label.new(composite, SWT::NONE)
#    img_Label.setLayoutData(GridData.new(195, 181));
#    img = Image.new(@display, "login.png");
#    img_Label.setImage(img);

    #Creating the composite which will contain
    #the login related widgets
    cmp_Login = Composite.new(composite, SWT::NONE);
    rowLayout = RowLayout.new();
    rowLayout.fill = true;
    cmp_Login.setLayout(rowLayout);
    gridData = GridData.new(GridData::FILL, GridData::FILL, false, false);
    gridData.widthHint = 196;
    cmp_Login.setLayoutData(gridData);

    #Label for the heading
    clbl_UserLogin = CLabel.new(cmp_Login, SWT::NONE);
    rowData = RowData.new();
    rowData.width = 180;
    clbl_UserLogin.setLayoutData(rowData);
    clbl_UserLogin.setText("User Login");

    #Label for the username
    clbl_Username = CLabel.new(cmp_Login, SWT::NONE);
    rowData_1 = RowData.new();
    rowData_1.width = 180;
    clbl_Username.setLayoutData(rowData_1);
    clbl_Username.setText("Username");

    #Textfield for the username
    txt_Username = Text.new(cmp_Login, SWT::BORDER);
    rowData_2 = RowData.new();
    rowData_2.width = 170;
    txt_Username.setLayoutData(rowData_2);

    #Label for the password
    clbl_Password = CLabel.new(cmp_Login, SWT::NONE);
    rowData_3 =  RowData.new();
    rowData_3.width = 180;
    clbl_Password.setLayoutData(rowData_3);
    clbl_Password.setText("Password");

    #Textfield for the password
    txt_Password = Text.new(cmp_Login, SWT::BORDER);
    rowData_4 =  RowData.new();
    rowData_4.width = 170;
    txt_Password.setLayoutData(rowData_4);
    txt_Password.setEchoChar('*'[0]);

    #Composite to hold button as I want the
    #button to be positioned to my choice.
    cmp_ButtonBar =  Composite.new(cmp_Login, SWT::NONE);
    rowData_5 = RowData.new();
    rowData_5.height = 38;
    rowData_5.width = 185;
    cmp_ButtonBar.setLayoutData(rowData_5);
    cmp_ButtonBar.setLayout(FormLayout.new());

    #Button for login
#    btn_login =  Button.new(cmp_ButtonBar, SWT::FLAT);
#    formData =  FormData.new();
#    formData.bottom = FormAttachment.new(0, 28);
#    formData.top = FormAttachment.new(0, 5);
#    formData.right = FormAttachment.new(100, -3);
#    formData.left = FormAttachment.new(100, -40);
#    btn_login.setLayoutData(formData);
#    btn_login.setText("Login");

    #Adding CLOSE action to this button.
#    btn_login.addListener(SWT::Selection) do
#      shell.close();
#      #In your case, you might wish
#      #to call the authentication method.
#    end

    #Label for copyright info
    clbl_Message =  CLabel.new(cmp_Login, SWT::NONE);
    clbl_Message.setAlignment(SWT::RIGHT);
    rowData_6 =  RowData.new();
    rowData_6.width = 188;
    clbl_Message.setLayoutData(rowData_6);
    clbl_Message.setText("My Custom Login Screen");

    #Drawing a region which will
    #form the base of the login
#    region =  Region.new();
#    pixel =  Rectangle.new(1, 1, 388, 180);
#    region.add(pixel);
#    shell.setRegion(region);

    #Adding ability to move shell around
    l =  Proc.new do |e|
      case e.type
        when SWT::MouseDown
        origin = Point.new(e.x, e.y);
        when SWT::MouseUp
        origin = null;
        when SWT::MouseMove
        if (origin != nil)
          p = @display.map(shell, nil, e.x, e.y);
          shell.setLocation(p.x - origin.x, p.y - origin.y);
        end
      end
    end;

    #Adding the listeners
    #to all visible components
    composite.addListener(SWT::MouseDown, l);
    composite.addListener(SWT::MouseUp, l);
    composite.addListener(SWT::MouseMove, l);

#    img_Label.addListener(SWT::MouseDown, l);
#    img_Label.addListener(SWT::MouseUp, l);
#    img_Label.addListener(SWT::MouseMove, l);

    #Positioning in the center of the screen.
    #This for the 1024 resolution only. Later,
    #I plan to make generic so, that it takes
    #the resolution and finds the center of
    #the screen.
    shell.setLocation(320,290);
    shell.open();

    while (!shell.isDisposed())
      if (!@display.read_and_dispatch())
        @display.sleep();
      end
    end
#    region.dispose();
  end # create contents

end # class