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litesoft / trunk / GWT_Sandbox / FormEngine / src / com / temp / foundation / client / widget / WizardProgressIndicator.java
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package com.temp.foundation.client.widget; import org.litesoft.externalization.shared.*; import com.google.gwt.dom.client.*; import com.google.gwt.event.dom.client.*; import com.google.gwt.user.client.Element; import com.google.gwt.user.client.Timer; import com.google.gwt.user.client.ui.*; import com.temp.common.shared.utils.*; import java.util.*; public class WizardProgressIndicator<T extends Enum<T>> extends Composite { public static final String WIZARD_PROGRESS_STEP = "WizardProgressStep"; public static final String WIZARD_PROGRESS_TEXT = "WizardProgressText"; public static final String WIZARD_PROGRESS_CLICKABLE = "WizardProgressClickable"; private static final int POST_TEXT_SPACE = 15; private static final String STR_POST_TEXT_SPACE = POST_TEXT_SPACE + "px"; private static final String LadderUrlLine = "images/wizardSteps/Ladder-Line.png"; private static final String LadderUrlLineEnd = "images/wizardSteps/Ladder-LineEnd.png"; private static final String LadderUrlPagePrev = "images/wizardSteps/Ladder-PagePrev.png"; private static final String LadderUrlPageCurrent = "images/wizardSteps/Ladder-PageCurrent.png"; private static final String LadderUrlPageNext = "images/wizardSteps/Ladder-PageNext.png"; public static final String SUFFIX_PREV = "Prev"; public static final String SUFFIX_CURRENT = "Current"; public static final String SUFFIX_NEXT = "Next"; public interface PrevClicked<E extends Enum<E>> { void prevClicked( E step ); } private final E13nResolver mResolver; private final ClickHandler[] mClickHandlers; private final ImageElement[] mLineImages; private final Widget[] mPageTextWidget; private final Element mStyleElement; private final OurSizer mSizer = new OurSizer(); private PrevClicked<T> mPrevClicked; public WizardProgressIndicator( String pContext, T pCurrentStep, T[] pSteps ) { pContext = StringUtils.noEmpty( pContext ); mResolver = Global.get( E13nResolver.class ).withOptionalContext( pContext ); int zIndexOfCurrent = validateParams( pCurrentStep, pSteps ); // 0 based mClickHandlers = createClickHandlers( zIndexOfCurrent, pSteps ); mPageTextWidget = createPageTextWidgets( zIndexOfCurrent, pSteps ); SimplePanel zStyleWrapper = new SimplePanel(); mStyleElement = zStyleWrapper.getElement(); Image[] zLineImages = createLineImages( pSteps.length ); Image[] zPagePositionImages = createPagePositionImages( zIndexOfCurrent, pSteps.length ); Label[] zStepNumbers = createStepNumberLabels( zIndexOfCurrent, pSteps.length ); mLineImages = extractElements( zLineImages ); initWidget( createStyleSandwich( zStyleWrapper, createGrid( zPagePositionImages, zLineImages, zStepNumbers ) ) ); } public WizardProgressIndicator<T> setPrevClickedCallback( PrevClicked<T> pPrevClicked ) { mPrevClicked = pPrevClicked; return this; } @Override protected Element getStyleElement() { return mStyleElement; } @Override protected void onAttach() { super.onAttach(); mSizer.run(); } private Widget createGrid( Image[] pPagePositionImages, Image[] pLineImages, Label[] pStepNumbers ) { Grid grid = new Grid( 2, pPagePositionImages.length + mLineImages.length + 1 ); grid.setCellPadding( 0 ); grid.setCellSpacing( 0 ); int zColumn = 0; for ( int i = 0; i < pPagePositionImages.length; i++ ) { Label zStepNumber = pStepNumbers[i]; grid.setWidget( 0, zColumn, pPagePositionImages[i] ); grid.setWidget( 1, zColumn, zStepNumber ); zColumn++; grid.setWidget( 0, zColumn, pLineImages[i] ); grid.setWidget( 1, zColumn, mPageTextWidget[i] ); zColumn++; centerInTD( zStepNumber ); } grid.setWidget( 0, zColumn, new Image( LadderUrlLineEnd ) ); grid.setWidget( 1, zColumn, new Spacer().size( "1px" ) ); return grid; } private void centerInTD( Widget pWidget ) { pWidget.getElement().getParentElement().setAttribute( "Align", "Center" ); } private Widget[] createPageTextWidgets( int pIndexOfCurrent, T[] pSteps ) { Widget[] widgets = new Widget[pSteps.length]; for ( int i = 0; i < pSteps.length; i++ ) { widgets[i] = createPageTextWidget( i, pIndexOfCurrent, pSteps[i] ); } return widgets; } private Widget createPageTextWidget( int pIndex, int pIndexOfCurrent, T pStep ) { HorizontalPanel panel = new HorizontalPanel(); panel.add( createStepLabel( pIndex, pIndexOfCurrent, resolve( pStep.name() ), WIZARD_PROGRESS_TEXT ) ); panel.add( new Spacer().height( "1px" ).width( STR_POST_TEXT_SPACE ) ); return panel; } private ClickHandler[] createClickHandlers( int pCountOfPrevs, T[] pSteps ) { ClickHandler[] zHandlers = new ClickHandler[pCountOfPrevs]; for ( int i = 0; i < pCountOfPrevs; i++ ) { zHandlers[i] = new OurClickHandler( pSteps[i] ); } return zHandlers; } private Widget createStyleSandwich( SimplePanel pStyleWrapper, Widget pContent ) { HorizontalPanel zConstrainingTable = new HorizontalPanel(); zConstrainingTable.add( pStyleWrapper ); pStyleWrapper.setWidget( pContent ); return zConstrainingTable; } private Image[] createPagePositionImages( int pIndexOfCurrent, int pLength ) { Image[] images = new Image[pLength]; for ( int i = 0; i < images.length; i++ ) { Image image; if ( i < pIndexOfCurrent ) { image = new Image( LadderUrlPagePrev ); image.addClickHandler( mClickHandlers[i] ); image.addStyleName( WIZARD_PROGRESS_CLICKABLE ); } else if ( i == pIndexOfCurrent ) { image = new Image( LadderUrlPageCurrent ); } else { image = new Image( LadderUrlPageNext ); } images[i] = image; } return images; } private Image[] createLineImages( int pLength ) { Image[] images = new Image[pLength]; for ( int i = 0; i < images.length; i++ ) { images[i] = new Image( LadderUrlLine ); } return images; } private ImageElement[] extractElements( Image[] pImages ) { ImageElement[] imageElements = new ImageElement[pImages.length]; for ( int i = 0; i < pImages.length; i++ ) { imageElements[i] = ImageElement.as( pImages[i].getElement() ); } return imageElements; } private Label[] createStepNumberLabels( int pIndexOfCurrent, int pLength ) { Label[] labels = new Label[pLength]; for ( int i = 0; i < labels.length; i++ ) { labels[i] = createStepLabel( i, pIndexOfCurrent, Integer.toString( i + 1 ), WIZARD_PROGRESS_STEP ); } return labels; } private Label createStepLabel( int pIndex, int pIndexOfCurrent, String pText, String pStyleName ) { Label label = new Label( pText ); label.addStyleName( pStyleName ); if ( pIndex < pIndexOfCurrent ) { label.addClickHandler( mClickHandlers[pIndex] ); label.addStyleName( WIZARD_PROGRESS_CLICKABLE ); label.addStyleName( pStyleName + SUFFIX_PREV ); } else if ( pIndex == pIndexOfCurrent ) { label.addStyleName( pStyleName + SUFFIX_CURRENT ); } else { label.addStyleName( pStyleName + SUFFIX_NEXT ); } return label; } /** * Validate the parameters and return the index of pStep * * @param pStep !null and must be one of pSteps * @param pSteps !null, No Nulls, and must be at least two entries * * @return index of pStep in pSteps */ private int validateParams( T pStep, T[] pSteps ) { Assert.notNull( "Step", pStep ); Assert.notNull( "Steps", pSteps ); int zAt = -1; for ( int i = 0; i < pSteps.length; i++ ) { T zStep = pSteps[i]; if ( zStep == null ) { throw Assert.nullValue( "Steps[" + i + "]" ); } if ( zStep == pStep ) { zAt = i; } } if ( zAt == -1 ) { throw new IllegalArgumentException( "Step '" + pStep + "' not one of: " + Arrays.asList( pSteps ) ); } return zAt; } private class OurClickHandler implements ClickHandler { private T mStep; private OurClickHandler( T pStep ) { mStep = pStep; } @Override public void onClick( ClickEvent event ) { if ( mPrevClicked != null ) { mPrevClicked.prevClicked( mStep ); } } } private class OurSizer extends Timer { private int mDelay = 0; private Integer mDesiredWidth; private boolean mSized; @Override public void run() { if ( mSized || !isAttached() ) { return; // Already Sized OR Lost Attachment } if ( mDesiredWidth == null ) { mDesiredWidth = determineMaxWidth( mPageTextWidget ); // System.out.println("DesiredWidth: " + mDesiredWidth); } if ( mDesiredWidth != null ) { mSized = applyWidth( mDesiredWidth, mLineImages ); // System.out.println("Sized: " + mSized); } if ( !mSized ) { mDelay = Math.min( mDelay + 50, 250 ); schedule( mDelay ); } } private Integer determineMaxWidth( Widget[] pWidgets ) { int zMax = 0; for ( Widget widget : pWidgets ) { int width = widget.getOffsetWidth(); if ( width < POST_TEXT_SPACE ) { return null; } zMax = Math.max( zMax, width ); } return zMax; } private boolean applyWidth( int pWidth, ImageElement[] pImages ) { for ( ImageElement imageElement : pImages ) { int height = imageElement.getHeight(); if ( height < 1 ) { return false; } imageElement.setHeight( height ); imageElement.setWidth( pWidth ); } return true; } } private String resolve( String pKey ) { String value = mResolver.resolve( pKey ); return (value != null) ? value : "[" + pKey + "]"; } } |