package org.kuali.student.common.ui.client.widgets.field.layout.layouts;

 import org.kuali.student.common.ui.client.configurable.mvc.SectionTitle;

 import org.kuali.student.common.ui.client.configurable.mvc.sections.ValidationMessagePanel;

 import org.kuali.student.common.ui.client.widgets.field.layout.button.ButtonLayout;

 import org.kuali.student.common.ui.client.widgets.field.layout.element.FieldElement;

 import org.kuali.student.common.ui.client.widgets.field.layout.element.SpanPanel;

 import com.google.gwt.user.client.ui.FlexTable;

 import com.google.gwt.user.client.ui.HasVerticalAlignment;

 import com.google.gwt.user.client.ui.Widget;

 /**

  * A layout which lays out fields and other layouts horizontally in a table.  Fields and layouts added will appear

  * in the order they are added.  Calling nextIndex will begin the next row in the table.

  * Validation will appear above the horizontal layout if hasValidation is true.

  * The title will appear above all elements and button layout below all elements.

  * 

  * @author Kuali Student Team

  *

  */

 public class HorizontalLayout extends FieldLayout{

         private FlexTable horizontalArea = new FlexTable();

         private ValidationMessagePanel validationPanel = new ValidationMessagePanel();

         private SpanPanel fieldArea = new SpanPanel();

         private SpanPanel buttonArea;

         private int currentRow = 0;

         private int currentColumn = 0;

         public HorizontalLayout(){

                 super();

                 hasValidation = true;

                 init();

         }

         public HorizontalLayout(boolean hasValidation){

                 super();

                 this.hasValidation = hasValidation;

                 init();

         }

         public HorizontalLayout(SectionTitle title){

                 super();

                 this.setLayoutTitle(title);

                 hasValidation = true;

                 init();

         }

         public HorizontalLayout(SectionTitle title, boolean hasValidation){

                 super();

                 this.setLayoutTitle(title);

                 this.hasValidation = hasValidation;

                 init();

         }

         private void init(){

                 instructions.setVisible(false);

                 this.add(instructions);

                 this.add(message);

                 if(hasValidation){

                         this.add(validationPanel);

                 }

                 this.add(horizontalArea);

         }

         @Override

         public void addButtonLayoutToLayout(ButtonLayout buttonLayout) {

                 if(buttonArea == null){

                         buttonArea = new SpanPanel();

                         this.add(buttonArea);

                 }

                 buttonArea.add(buttonLayout);

         }

         @Override

         public void addFieldToLayout(FieldElement field) {

                 horizontalArea.setWidget(currentRow, currentColumn, field);

                 horizontalArea.getFlexCellFormatter().setVerticalAlignment(currentRow, currentColumn, HasVerticalAlignment.ALIGN_TOP);

                 if(hasValidation){

                         field.setValidationPanel(validationPanel);

                 }

                 currentColumn++;

         }

         @Override

         public void addLayoutToLayout(FieldLayout layout) {

                 horizontalArea.setWidget(currentRow, currentColumn, layout);

                 horizontalArea.getFlexCellFormatter().setVerticalAlignment(currentRow, currentColumn, HasVerticalAlignment.ALIGN_TOP);

                 currentColumn++;

         }

         @Override

         public void addWidgetToLayout(Widget widget) {

                 horizontalArea.setWidget(currentRow, currentColumn, widget);

                 horizontalArea.getFlexCellFormatter().setVerticalAlignment(currentRow, currentColumn, HasVerticalAlignment.ALIGN_TOP);

                 currentColumn++;

         }

         public void nextRow(){

                 currentRow++;

                 currentColumn = 0;

         }

         @Override

         public void removeFieldLayoutComponentFromLayout(

                         FieldLayoutComponent component) {

                 if(component instanceof FieldElement){

                         horizontalArea.remove((FieldElement)component);

                 }

                 else if(component instanceof FieldLayout){

                         horizontalArea.remove((FieldLayout)component);

                 }

         }

         @Override

         public void removeWidgetFromLayout(Widget widget) {

                 horizontalArea.remove(widget);        

         }

         @Override

         public void setLayoutTitle(SectionTitle layoutTitle) {

                 if(this.layoutTitle != null){

                         this.remove(this.layoutTitle);

                 }

                 if(layoutTitle != null){

                         this.layoutTitle = layoutTitle;

                         this.insert(layoutTitle, 0);

                         layoutTitle.addStyleName("ks-layout-header");

                 }

         }

 }