/*******************************************************************************
 * Copyright (c) 2002, 2013 Innoopract Informationssysteme GmbH and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    Innoopract Informationssysteme GmbH - initial API and implementation
 *    EclipseSource - ongoing development
 ******************************************************************************/
package org.eclipse.rap.demo.controls;

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.FormAttachment;
import org.eclipse.swt.layout.FormData;
import org.eclipse.swt.layout.FormLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Label;


public class ZOrderTab extends ExampleTab {

  private Label label;

  public ZOrderTab() {
    super( "Z-Order" );
  }

  @Override
  protected void createStyleControls( final Composite parent ) {
  }

  @Override
  protected void createExampleControls( final Composite top ) {
    top.setLayout( new FormLayout() );

    final Composite comp = new Composite( top, SWT.NONE );
    comp.setLayout( new FormLayout() );
    FormData fdComp = new FormData();
    fdComp.top = new FormAttachment( 0, 0 );
    fdComp.left = new FormAttachment( 0, 0 );
    fdComp.right = new FormAttachment( 100, 0 );
    fdComp.bottom = new FormAttachment( 70, 0 );
    comp.setLayoutData( fdComp );

    final Label labelA = createLabel( comp, 15, 45 );
    labelA.setText( "A" );
    labelA.setBackground( bgColors[ BG_COLOR_BLUE ] );

    final Label labelB = createLabel( comp, 35, 65 );
    labelB.setText( "B" );
    labelB.setBackground( bgColors[ BG_COLOR_GREEN ] );

    final Label labelC = createLabel( comp, 55, 85 );
    labelC.setText( "C" );
    labelC.setBackground( bgColors[ BG_COLOR_BROWN ] );

    label = new Label( comp , SWT.CENTER );
    FormData fdData = fdComp;
    fdData.top = new FormAttachment( labelC, labelC.getSize().y + 10 );
    fdData.left = new FormAttachment( 0, 0 );
    fdData.right = new FormAttachment( 100, 0 );
    label.setLayoutData( fdData );
    label.setText( "trallala" );

    Button aboveA = createButton( top, 80, 10, 36 );
    aboveA.setText( "B above A" );
    aboveA.addSelectionListener( new SelectionAdapter() {
      @Override
      public void widgetSelected( final SelectionEvent e ) {
        labelB.moveAbove( labelA );
        printChildren( comp );
      }
    } );

    Button belowA = createButton( top, aboveA, 10, 36 );
    belowA.setText( "B below A" );
    belowA.addSelectionListener( new SelectionAdapter() {
      @Override
      public void widgetSelected( final SelectionEvent e ) {
        labelB.moveBelow( labelA );
        printChildren( comp );
      }
    } );

    Button aboveAll = createButton( top, 80, 37, 63 );
    aboveAll.setText( "B above all" );
    aboveAll.addSelectionListener( new SelectionAdapter() {
      @Override
      public void widgetSelected( final SelectionEvent e ) {
        labelB.moveAbove( null );
        printChildren( comp );
      }
    } );

    Button belowAll = createButton( top, aboveAll, 37, 63 );
    belowAll.setText( "B below all" );
    belowAll.addSelectionListener( new SelectionAdapter() {
      @Override
      public void widgetSelected( final SelectionEvent e ) {
        labelB.moveBelow( null );
        printChildren( comp );
      }
    } );

    Button aboveC = createButton( top, 80, 64, 90 );
    aboveC.setText( "B above C" );
    aboveC.addSelectionListener( new SelectionAdapter() {
      @Override
      public void widgetSelected( final SelectionEvent e ) {
        labelB.moveAbove( labelC );
        printChildren( comp );
      }
    } );

    Button belowC = createButton( top, aboveC, 64, 90 );
    belowC.setText( "B below C" );
    belowC.addSelectionListener( new SelectionAdapter() {
      @Override
      public void widgetSelected( final SelectionEvent e ) {
        labelB.moveBelow( labelC );
        printChildren( comp );
      }
    } );

    top.setTabList( new Control[]{
      aboveA, aboveAll, aboveC, belowA, belowAll, belowC
    } );
  }

  private Button createButton( final Composite composite,
                               final int top,
                               final int left,
                               final int right )
  {
    Button result = new Button( composite, SWT.PUSH );
    FormData fdButton = new FormData();
    fdButton.top = new FormAttachment( top, 0 );
    fdButton.left = new FormAttachment( left, 0 );
    fdButton.right = new FormAttachment( right, 0 );
    result.setLayoutData( fdButton );
    return result;
  }

  private Button createButton( final Composite composite,
                               final Control top,
                               final int left,
                               final int right )
  {
    Button result = new Button( composite, SWT.PUSH );
    FormData fdButton = new FormData();
    fdButton.top = new FormAttachment( top, 1 );
    fdButton.left = new FormAttachment( left, 0 );
    fdButton.right = new FormAttachment( right, 0 );
    result.setLayoutData( fdButton );
    return result;
  }

  private Label createLabel( final Composite top,
                             final int topAndLeft,
                             final int rightAndBottom )
  {
    final Label result = new Label( top, SWT.BORDER | SWT.CENTER );
    FormData fdLabel = new FormData();
    fdLabel.top = new FormAttachment( topAndLeft, 0 );
    fdLabel.left = new FormAttachment( topAndLeft, 0 );
    fdLabel.right = new FormAttachment( rightAndBottom, 0 );
    fdLabel.bottom = new FormAttachment( rightAndBottom, 0 );
    result.setLayoutData( fdLabel );
    return result;
  }

  private void printChildren( final Composite comp ) {
    Control[] children = comp.getChildren();
    StringBuffer sb = new StringBuffer( "Z-Order: " );
    for( int i = 0; i < children.length; i++ ) {
      sb.append( ((Label) children[ i ]).getText() + " " );
    }
    label.setText( sb.toString() );
  }
}