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litesoft / trunk / GWT_Sandbox / FormEngine / src / com / temp / client / foundation / widget / AccordionVerticalPairPanel.java
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package com.temp.client.foundation.widget; import com.google.gwt.animation.client.*; import com.google.gwt.dom.client.*; import com.google.gwt.user.client.ui.*; import java.util.*; /** * This class provides for creating a VerticalPanel "like" object that takes widgets as Pairs. * * These Widget Pairs are called the Prime Widget and the Subordinate Widget. All the Prime Widgets are * visible, but the Subordinate Widget attached to the Prime Widget is only visible if visibility is requested. * * The showing and hiding of the a Subordinate Widget is animated! * * @author georgs */ public class AccordionVerticalPairPanel extends Composite { public static class WidgetPair { private Widget prime, mSubordinate; private boolean showing; private PairPanel pairPanel; public WidgetPair(Widget prime, Widget subordinate) { this.prime = prime; this.mSubordinate = subordinate; } public Widget getPrime() { return prime; } public Widget getSubordinate() { return mSubordinate; } public boolean isSubordinateShowing() { if (showing) { showing = checkPrimeAncestry(prime) && checkSubordinateAncestry(mSubordinate); } return showing; } private boolean isShowing() { return showing; } private void setShowing(boolean showing) { this.showing = showing; } private static boolean hasContent(WidgetPair pair) { return (pair != null) && (pair.prime != null); } private PairPanel getPairPanel() { return pairPanel; } private void setPairPanel(PairPanel pairPanel) { this.pairPanel = pairPanel; } } private VerticalPanel container = new VerticalPanel(); private List<WidgetPair> members = new ArrayList<WidgetPair>(); public AccordionVerticalPairPanel() { initWidget(container); } public boolean isEmpty() { return members.isEmpty(); } public int size() { return members.size(); } /** * Add the two widgets as a WidgetPair (if pPrimeWidget is not null). * * @return true if the widgets were actually added. */ public boolean add(Widget primeWidget, Widget subordinateWidget) { return add(new WidgetPair(primeWidget, subordinateWidget)); } /** * Add the WidgetPair (if either of the widgets that make up the pair are * not null). * * @return true if the WidgetPair was actually added. */ public boolean add(WidgetPair widgetPair) { if (WidgetPair.hasContent(widgetPair)) { members.add(widgetPair); container.add(new PairPanel(this, widgetPair)); return true; } return false; } public int indexOf(WidgetPair widgetPair) { return members.indexOf(widgetPair); } public int indexOfSubordinateWidget(Widget subordinateWidget) { for (int i = 0; i < members.size(); i++) { WidgetPair zMember = members.get(i); if (subordinateWidget == zMember.getSubordinate()) { return i; } } return -1; } public int indexOfPrimeWidget(Widget primeWidget) { for (int i = 0; i < members.size(); i++) { WidgetPair zMember = members.get(i); if (primeWidget == zMember.getPrime()) { return i; } } return -1; } /** * @return true if contents changed (i.e. actually removed) */ public boolean remove(WidgetPair widgetPair) { int zIndex = indexOf(widgetPair); return (zIndex != -1) && (null != remove(zIndex)); } /** * @return WidgetPair that "was" at pIndex. */ public WidgetPair remove(int index) throws IndexOutOfBoundsException { WidgetPair zRemoved = members.remove(index); if (zRemoved != null) { PairPanel zPairPanel = zRemoved.getPairPanel(); if (zPairPanel != null) { zPairPanel.clear(); } zRemoved.setShowing(false); container.remove(index); } return zRemoved; } /** * Removes all widgets (both the Prime and the Subordinate). */ public void clear() { container.clear(); for (WidgetPair zMember : members) { PairPanel zPairPanel = zMember.getPairPanel(); if (zPairPanel != null) { zPairPanel.clear(); } zMember.setShowing(false); } members.clear(); } public void collapseAll() { for (WidgetPair zMember : members) { PairPanel zPairPanel = zMember.getPairPanel(); if (zPairPanel != null) { zPairPanel.collapse(); } zMember.setShowing(false); } } /** * Expand (show) or Collapse (!show) the pSubordinateWidget (if found) * according to the pShow value requested. * * @param subordinateWidget * the Subordinate Widget to locate * @param show * what to do with the Subordinate Widget if located * * @return true if the Subordinate Widget was located */ public boolean show(Widget subordinateWidget, boolean show) { return showSubordinateWidgetOf(getPairFor(subordinateWidget), show); } /** * Expand (show) or Collapse (!show) the Subordinate Widget (at pIndex) * according to the pShow value requested. * * @param index * Index of the the Subordinate Widget * @param show * what to do with the Subordinate Widget */ public void showSubordinateWidgetAt(int index, boolean show) throws IndexOutOfBoundsException { showSubordinateWidgetOf(members.get(index), show); } /** * Expand (show) or Collapse (!show) the Subordinate Widget of the * WidgetPair (if found) according to the pShow value requested. * * @param widgetPair * the Widget Pair to locate * @param show * what to do with the Subordinate Widget of the Widget Pair if * located * * @return true if the Widget Pair was located */ public boolean showSubordinateWidgetOf(WidgetPair widgetPair, boolean show) { if (members.contains(widgetPair)) { PairPanel zPairPanel = widgetPair.getPairPanel(); if (zPairPanel != null) { if (show) { zPairPanel.expand(); } else { zPairPanel.collapse(); } widgetPair.setShowing(show); return true; } } return false; } public boolean isShowing(Widget subordinateWidget) { return isSubordinateWidgetShowing(getPairFor(subordinateWidget)); } public boolean isSubordinateWidgetShowingAt(int index) throws IndexOutOfBoundsException { return isSubordinateWidgetShowing(members.get(index)); } public boolean isSubordinateWidgetShowing(WidgetPair widgetPair) { return members.contains(widgetPair) && widgetPair.isShowing(); } private WidgetPair getPairFor(Widget pSubordinateWidget) { for (WidgetPair zMember : members) { if (pSubordinateWidget == zMember.getSubordinate()) { return zMember; } } return null; } /** * Only called by the PairPanel that should be removed because the PairPanel * has lost one of its widgets. */ private void removePair(PairPanel pairPanel) { for (int i = 0; i < members.size(); i++) { WidgetPair zMember = members.get(i); PairPanel zPairPanel = zMember.getPairPanel(); if (pairPanel == zPairPanel) { remove(i); return; } } } private static boolean checkSubordinateAncestry(Widget widget) { return (widget == null) || // (null != parentClassIs(PairPanel.class, // parentClassIs(ClippingPanel.class, // parentClassIs(SubordinatePanel.class, // widget)))); } private static boolean checkPrimeAncestry(Widget widget) { return (null != parentClassIs(PairPanel.class, widget)); } private static Widget parentClassIs(Class<?> klass, Widget widget) { if (widget != null) { if (null != (widget = widget.getParent())) { if (widget.getClass() == klass) { return widget; } } } return null; } private static class PairPanel extends VerticalPanel { private AccordionVerticalPairPanel parent; private ClippingPanel clippingPanel; private PairPanel(AccordionVerticalPairPanel pParent, WidgetPair widgetPair) { this.parent = pParent; add(widgetPair.getPrime()); add(this.clippingPanel = new ClippingPanel(this, widgetPair.getSubordinate())); widgetPair.setPairPanel(this); } public void collapse() { clippingPanel.collapse(); } public void expand() { clippingPanel.expand(); } /** * Clear/Release our Widgets (this is called under two circumstances: * our Parent is clearing and calling us to clean up, or one of our * children has been removed so we are no longer attached to our parent * and are cleaning up). */ @Override public void clear() { parent = null; // in case remove is called as part of the clear operation, then don't generate a potential infinite loop! super.clear(); if (clippingPanel != null) { clippingPanel.clear(); clippingPanel = null; } } /** * Here we handle the case when either the Prime Widget is removed (by * being attached somewhere else) or the Clipping Panel removes itself. * <p/> * We Automatically remove ourselves from our Parent * (AccordionVerticalPairPanel). */ @Override public boolean remove(Widget w) { boolean zRemoved = super.remove(w); if (zRemoved) { if (parent != null) // in case remove is called as part of the clear operation, then don't generate a potential infinite loop! { parent.removePair(this); clear(); } } return zRemoved; } } private enum AnimatedVisibility { Collapsing(true), Collapsed(true), Expanding(false), Expanded(false); private boolean collapsingOrCollapsed; AnimatedVisibility(boolean collapsingOrCollapsed) { this.collapsingOrCollapsed = collapsingOrCollapsed; } public boolean isCollapsingOrCollapsed() { return collapsingOrCollapsed; } public boolean isExpandingOrExpanded() { return !collapsingOrCollapsed; } } private static class ClippingPanel extends SimplePanel { private PairPanel parent; private SubordinatePanel subordinatePanel; private AnimatedVisibility visibility = AnimatedVisibility.Collapsed; private AnimatedVisibility targetVisibility; private int currentHeight = 1; private Integer maxHeight; private HeightAnimator animator; private ClippingPanel(PairPanel parent, Widget subordinateWidget) { this.parent = parent; setWidget(subordinatePanel = new SubordinatePanel(this, subordinateWidget)); getStyleElement().getStyle().setOverflow(Style.Overflow.HIDDEN); setHeight("1px"); } /** * Clear/Release our Widget (this is called under two circumstances: our * Parent is clearing and calling us to clean up, or our child has been * removed so we are no longer attached to our parent and are cleaning * up). */ @Override public void clear() { parent = null; // in case remove is called as part of the clear operation, then don't generate a potential infinite loop! super.clear(); if (subordinatePanel != null) { subordinatePanel.clear(); subordinatePanel = null; } } /** * Here we handle the case when the Subordinate Panel removes itself. * <p/> * We Automatically remove ourselves from our Parent (PairPanel). */ @Override public boolean remove(Widget w) { boolean zRemoved = super.remove(w); if (zRemoved) { if (parent != null) // in case remove is called as part of the clear operation, then don't generate a potential infinite loop! { parent.remove(this); clear(); } } return zRemoved; } public void collapse() { if (sizingIsReadyWithNotReadyTarget(AnimatedVisibility.Collapsed) && visibility.isExpandingOrExpanded()) { transition(AnimatedVisibility.Collapsing, 1); } } public void expand() { if (sizingIsReadyWithNotReadyTarget(AnimatedVisibility.Expanded) && visibility.isCollapsingOrCollapsed()) { transition(AnimatedVisibility.Expanding, maxHeight); } } /** * Some browsers implement incremental rendering, which means that when * an element is added to the DOM, it can take some time until it is * actually rendered and hence actually has a size (of course if any * element along the path to the root is display=none, then a size might * NEVER arrive). */ private boolean sizingIsReadyWithNotReadyTarget(AnimatedVisibility targetVisibility) { if (maxHeight == null) { this.targetVisibility = targetVisibility; return false; } this.targetVisibility = null; return true; } /** * Called to indicate that Sizing is Ready! */ private void setMaxHeight(int height) { maxHeight = height; // Now dispatch the last request (if any) that occured before Sizing was Ready! if (AnimatedVisibility.Collapsed == targetVisibility) { collapse(); } if (AnimatedVisibility.Expanded == targetVisibility) { expand(); } } private void setCurrentHeight(int height) { if (height < 2) { visibility = AnimatedVisibility.Collapsed; height = 1; } if (maxHeight <= height) { visibility = AnimatedVisibility.Expanded; height = maxHeight; } currentHeight = height; setHeight(height + "px"); } private void transition(AnimatedVisibility newVisibility, int targetHeight) { if (animator != null) { animator.cancel(); animator = null; } visibility = newVisibility; animator = new HeightAnimator(this, currentHeight, targetHeight); animator.start(); } } private static class SubordinatePanel extends VerticalPanel { private OurSizingDeterminer sizingDeterminer = new OurSizingDeterminer(); private ClippingPanel parent; private SubordinatePanel(ClippingPanel parent, Widget subordinateWidget) { this.parent = parent; add(new Spacer().size("1px")); add((null != subordinateWidget) ? subordinateWidget : new TransparentImage()); } /** * Clear/Release our Widgets (this is called under two circumstances: * our Parent is clearing and calling us to clean up, or one of our * children has been removed so we are no longer attached to our parent * and are cleaning up). */ @Override public void clear() { parent = null; // in case remove is called as part of the clear operation, then don't generate a potential infinite loop! super.clear(); } /** * Here we handle the case when the Subordinate Widget is removed by * being attached somewhere else. * <p/> * We Automatically remove ourselves from our Parent (ClippingPanel). */ @Override public boolean remove(Widget w) { boolean zRemoved = super.remove(w); if (zRemoved) { if (parent != null) // in case remove is called as part of the clear operation, then don't generate a potential infinite loop! { parent.remove(this); clear(); } } return zRemoved; } @Override protected void onAttach() { super.onAttach(); sizingDeterminer.start(); } @Override protected void onDetach() { super.onDetach(); sizingDeterminer.stop(); } /** * Some browsers implement incremental rendering, which means that when * an element is added to the DOM, it can take some time until it is * actually rendered and hence actually has a size (of course if any * element along the path to the root is display=none, then a size might * NEVER arrive). */ private class OurSizingDeterminer extends com.google.gwt.user.client.Timer { private Boolean sizingDetermined; private int height = 1; @Override public void run() { int zHeight = getOffsetHeight(); if ((1 < zHeight) && (zHeight == height)) { parent.setMaxHeight(zHeight); sizingDetermined = true; return; } height = zHeight; if (sizingDetermined != null) { schedule(50); } } public void start() { if (!Boolean.TRUE.equals(sizingDetermined)) { sizingDetermined = false; schedule(50); } } public void stop() { if (Boolean.FALSE.equals(sizingDetermined)) { sizingDetermined = null; cancel(); } } } } private static class HeightAnimator extends Animation { private ClippingPanel clippingPanel; private int fromHeight; private int toHeight; private int delta; private boolean completed = true; public HeightAnimator(ClippingPanel clippingPanel, int fromHeight, int toHeight) { this.clippingPanel = clippingPanel; this.fromHeight = fromHeight; this.toHeight = toHeight; delta = toHeight - fromHeight; } public void start() { completed = false; run(Math.min(700, Math.abs(7 * delta))); } @Override protected void onUpdate(double progress) { if (!completed) { clippingPanel.setCurrentHeight(fromHeight + (int) (progress * delta)); } } @Override protected void onComplete() { completed = true; super.onComplete(); clippingPanel.setCurrentHeight(toHeight); } } } |