litesoft
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litesoft / trunk / GWT_Sandbox / FormEngine / src / com / temp / foundation / widgets / WizardProgressIndicator.java
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package com.temp.foundation.widgets; import com.google.gwt.dom.client.*; import com.google.gwt.event.dom.client.*; import com.google.gwt.user.client.*; import com.google.gwt.user.client.Element; import com.google.gwt.user.client.ui.*; public class WizardProgressIndicator 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"; private final ClickHandler[] mClickHandlers; private final ImageElement[] mLineImages; private final Widget[] mPageTextWidget; private final Element mStyleElement; private final OurSizer mSizer = new OurSizer(); public WizardProgressIndicator(int pStep, String... pLabels) { if ((pStep < 1) || (pLabels.length < pStep)) { throw new IllegalArgumentException("Unacceptable Step, !(1 <= " + pStep + " <= " + pLabels.length + ")"); } int zIndexOfCurrent = pStep - 1; // Make 0 based mClickHandlers = createClickHandlers(zIndexOfCurrent); mPageTextWidget = createPageTextWidgets(zIndexOfCurrent, pLabels); SimplePanel zStyleWrapper = new SimplePanel(); mStyleElement = zStyleWrapper.getElement(); Image[] zLineImages = createLineImages(pLabels.length); Image[] zPagePositionImages = createPagePositionImages(zIndexOfCurrent, pLabels.length); Label[] zStepNumbers = createStepNumberLabels(zIndexOfCurrent, pLabels.length); mLineImages = extractElements(zLineImages); initWidget(createStyleSandwich(zStyleWrapper, createGrid(zPagePositionImages, zLineImages, zStepNumbers))); } @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, String[] pLabels) { Widget[] widgets = new Widget[pLabels.length]; for (int i = 0; i < pLabels.length; i++) { widgets[i] = createPageTextWidget(i, pIndexOfCurrent, pLabels[i]); } return widgets; } private Widget createPageTextWidget(int pIndex, int pIndexOfCurrent, String pLabel) { HorizontalPanel panel = new HorizontalPanel(); panel.add(createStepLabel(pIndex, pIndexOfCurrent, pLabel, WIZARD_PROGRESS_TEXT)); panel.add(new Spacer().height("1px").width(STR_POST_TEXT_SPACE)); return panel; } private ClickHandler[] createClickHandlers(int pCountOfPrevs) { ClickHandler[] zHandlers = new ClickHandler[pCountOfPrevs]; while (pCountOfPrevs > 0) { OurClickHandler handler = new OurClickHandler(pCountOfPrevs); zHandlers[--pCountOfPrevs] = handler; } 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; } private class OurClickHandler implements ClickHandler { private int mStep; private OurClickHandler(int pStep) { mStep = pStep; } @Override public void onClick(ClickEvent event) { 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; } } protected void prevClicked(int pStep) { System.out.println("Clicked on Previous Wizard Progress Indicator Step: " + pStep); } } |