public class CellBrowser extends AbstractCellTree implements ProvidesResize, RequiresResize, HasAnimation
This widget will only work in standards mode, which requires that the HTML page in which it is run have an explicit <!DOCTYPE> declaration.
public class CellBrowserExample implements EntryPoint {
/**
* The model that defines the nodes in the tree.
*/
private static class CustomTreeModel implements TreeViewModel {
/**
* Get the {@link NodeInfo} that provides the children of the specified
* value.
*/
public <T> NodeInfo<?> getNodeInfo(T value) {
/*
* Create some data in a data provider. Use the parent value as a prefix
* for the next level.
*/
ListDataProvider<String> dataProvider = new ListDataProvider<String>();
for (int i = 0; i < 2; i++) {
dataProvider.getList().add(value + "." + String.valueOf(i));
}
// Return a node info that pairs the data with a cell.
return new DefaultNodeInfo<String>(dataProvider, new TextCell());
}
/**
* Check if the specified value represents a leaf node. Leaf nodes cannot be
* opened.
*/
public boolean isLeaf(Object value) {
// The maximum length of a value is ten characters.
return value.toString().length() > 10;
}
}
public void onModuleLoad() {
// Create a model for the browser.
TreeViewModel model = new CustomTreeModel();
/*
* Create the browser using the model. We specify the default value of the
* hidden root node as "Item 1".
*/
CellBrowser tree = new CellBrowser(model, "Item 1");
// Add the tree to the root layout panel.
RootLayoutPanel.get().add(tree);
}
}
public class CellBrowserExample2 implements EntryPoint {
/**
* A list of songs.
*/
private static class Playlist {
private final String name;
private final List<String> songs = new ArrayList<String>();
public Playlist(String name) {
this.name = name;
}
/**
* Add a song to the playlist.
*
* @param name the name of the song
*/
public void addSong(String name) {
songs.add(name);
}
public String getName() {
return name;
}
/**
* Return the list of songs in the playlist.
*/
public List<String> getSongs() {
return songs;
}
}
/**
* A composer of classical music.
*/
private static class Composer {
private final String name;
private final List<Playlist> playlists = new ArrayList<Playlist>();
public Composer(String name) {
this.name = name;
}
/**
* Add a playlist to the composer.
*
* @param playlist the playlist to add
*/
public Playlist addPlaylist(Playlist playlist) {
playlists.add(playlist);
return playlist;
}
public String getName() {
return name;
}
/**
* Return the rockin' playlist for this composer.
*/
public List<Playlist> getPlaylists() {
return playlists;
}
}
/**
* The model that defines the nodes in the tree.
*/
private static class CustomTreeModel implements TreeViewModel {
private final List<Composer> composers;
/**
* This selection model is shared across all leaf nodes. A selection model
* can also be shared across all nodes in the tree, or each set of child
* nodes can have its own instance. This gives you flexibility to determine
* how nodes are selected.
*/
private final SingleSelectionModel<String> selectionModel = new SingleSelectionModel<String>();
public CustomTreeModel() {
// Create a database of information.
composers = new ArrayList<Composer>();
// Add compositions by Beethoven.
{
Composer beethoven = new Composer("Beethoven");
composers.add(beethoven);
Playlist concertos = beethoven.addPlaylist(new Playlist("Concertos"));
concertos.addSong("No. 1 - C");
concertos.addSong("No. 2 - B-Flat Major");
concertos.addSong("No. 3 - C Minor");
concertos.addSong("No. 4 - G Major");
concertos.addSong("No. 5 - E-Flat Major");
Playlist quartets = beethoven.addPlaylist(new Playlist("Quartets"));
quartets.addSong("Six String Quartets");
quartets.addSong("Three String Quartets");
quartets.addSong("Grosse Fugue for String Quartets");
Playlist sonatas = beethoven.addPlaylist(new Playlist("Sonatas"));
sonatas.addSong("Sonata in A Minor");
sonatas.addSong("Sonata in F Major");
Playlist symphonies = beethoven.addPlaylist(new Playlist("Symphonies"));
symphonies.addSong("No. 2 - D Major");
symphonies.addSong("No. 2 - D Major");
symphonies.addSong("No. 3 - E-Flat Major");
symphonies.addSong("No. 4 - B-Flat Major");
symphonies.addSong("No. 5 - C Minor");
symphonies.addSong("No. 6 - F Major");
symphonies.addSong("No. 7 - A Major");
symphonies.addSong("No. 8 - F Major");
symphonies.addSong("No. 9 - D Minor");
}
// Add compositions by Brahms.
{
Composer brahms = new Composer("Brahms");
composers.add(brahms);
Playlist concertos = brahms.addPlaylist(new Playlist("Concertos"));
concertos.addSong("Violin Concerto");
concertos.addSong("Double Concerto - A Minor");
concertos.addSong("Piano Concerto No. 1 - D Minor");
concertos.addSong("Piano Concerto No. 2 - B-Flat Major");
Playlist quartets = brahms.addPlaylist(new Playlist("Quartets"));
quartets.addSong("Piano Quartet No. 1 - G Minor");
quartets.addSong("Piano Quartet No. 2 - A Major");
quartets.addSong("Piano Quartet No. 3 - C Minor");
quartets.addSong("String Quartet No. 3 - B-Flat Minor");
Playlist sonatas = brahms.addPlaylist(new Playlist("Sonatas"));
sonatas.addSong("Two Sonatas for Clarinet - F Minor");
sonatas.addSong("Two Sonatas for Clarinet - E-Flat Major");
Playlist symphonies = brahms.addPlaylist(new Playlist("Symphonies"));
symphonies.addSong("No. 1 - C Minor");
symphonies.addSong("No. 2 - D Minor");
symphonies.addSong("No. 3 - F Major");
symphonies.addSong("No. 4 - E Minor");
}
// Add compositions by Mozart.
{
Composer mozart = new Composer("Mozart");
composers.add(mozart);
Playlist concertos = mozart.addPlaylist(new Playlist("Concertos"));
concertos.addSong("Piano Concerto No. 12");
concertos.addSong("Piano Concerto No. 17");
concertos.addSong("Clarinet Concerto");
concertos.addSong("Violin Concerto No. 5");
concertos.addSong("Violin Concerto No. 4");
}
}
/**
* Get the {@link NodeInfo} that provides the children of the specified
* value.
*/
public <T> NodeInfo<?> getNodeInfo(T value) {
if (value == null) {
// LEVEL 0.
// We passed null as the root value. Return the composers.
// Create a data provider that contains the list of composers.
ListDataProvider<Composer> dataProvider = new ListDataProvider<CellBrowserExample2.Composer>(
composers);
// Create a cell to display a composer.
Cell<Composer> cell = new AbstractCell<Composer>() {
@Override
public void render(Context context, Composer value, SafeHtmlBuilder sb) {
if (value != null) {
sb.appendEscaped(value.getName());
}
}
};
// Return a node info that pairs the data provider and the cell.
return new DefaultNodeInfo<Composer>(dataProvider, cell);
} else if (value instanceof Composer) {
// LEVEL 1.
// We want the children of the composer. Return the playlists.
ListDataProvider<Playlist> dataProvider = new ListDataProvider<Playlist>(
((Composer) value).getPlaylists());
Cell<Playlist> cell = new AbstractCell<Playlist>() {
@Override
public void render(Context context, Playlist value, SafeHtmlBuilder sb) {
if (value != null) {
sb.appendEscaped(value.getName());
}
}
};
return new DefaultNodeInfo<Playlist>(dataProvider, cell);
} else if (value instanceof Playlist) {
// LEVEL 2 - LEAF.
// We want the children of the playlist. Return the songs.
ListDataProvider<String> dataProvider = new ListDataProvider<String>(
((Playlist) value).getSongs());
// Use the shared selection model.
return new DefaultNodeInfo<String>(dataProvider, new TextCell(),
selectionModel, null);
}
return null;
}
/**
* Check if the specified value represents a leaf node. Leaf nodes cannot be
* opened.
*/
public boolean isLeaf(Object value) {
// The leaf nodes are the songs, which are Strings.
if (value instanceof String) {
return true;
}
return false;
}
}
public void onModuleLoad() {
// Create a model for the browser.
TreeViewModel model = new CustomTreeModel();
/*
* Create the browser using the model. We use <code>null</code> as the
* default value of the root node. The default value will be passed to
* CustomTreeModel#getNodeInfo();
*/
CellBrowser browser = new CellBrowser(model, null);
browser.setKeyboardSelectionPolicy(KeyboardSelectionPolicy.ENABLED);
// Add the browser to the root layout panel.
RootLayoutPanel.get().add(browser);
}
}
| Modifier and Type | Class and Description |
|---|---|
(package private) class |
CellBrowser.BrowserCellList<T>
A custom version of cell list used by the browser.
|
static class |
CellBrowser.Builder<T>
Builder object to create CellBrowser.
|
static interface |
CellBrowser.PagerFactory
Pager factory used to create pagers for each
CellList of the
CellBrowser. |
static interface |
CellBrowser.Resources
A ClientBundle that provides images for this widget.
|
static interface |
CellBrowser.Style
Styles used by this widget.
|
(package private) static interface |
CellBrowser.Template |
(package private) class |
CellBrowser.TreeNodeImpl<C>
A node in the tree.
|
UIObject.DebugIdImpl, UIObject.DebugIdImplEnabledHasKeyboardSelectionPolicy.KeyboardSelectionPolicy| Modifier and Type | Field and Description |
|---|---|
(package private) java.util.List<CellBrowser.TreeNodeImpl<?>> |
treeNodes
The visible
CellBrowser.TreeNodeImpls. |
DEBUG_ID_PREFIX| Modifier | Constructor and Description |
|---|---|
protected |
CellBrowser(CellBrowser.Builder<T> builder) |
|
CellBrowser(TreeViewModel viewModel,
T rootValue)
Deprecated.
please use
CellBrowser.Builder |
|
CellBrowser(TreeViewModel viewModel,
T rootValue,
CellBrowser.Resources resources)
Deprecated.
please use
CellBrowser.Builder |
| Modifier and Type | Method and Description |
|---|---|
protected <C> Widget |
createPager(HasData<C> display)
Create a pager to control the list view.
|
int |
getDefaultColumnWidth()
Get the default width of new columns.
|
int |
getMinimumColumnWidth()
Get the minimum width of columns.
|
TreeNode |
getRootTreeNode()
Get the root
TreeNode. |
boolean |
isAnimationEnabled()
Returns true if animations are enabled, false if not.
|
void |
onBrowserEvent(Event event)
Fired whenever a browser event is received.
|
void |
onResize()
This method must be called whenever the implementor's size has been
modified.
|
void |
setAnimationEnabled(boolean enable)
Enable or disable animations.
|
void |
setDefaultColumnWidth(int width)
Set the default width of new columns.
|
void |
setMinimumColumnWidth(int minWidth)
Set the minimum width of columns.
|
addCloseHandler, addOpenHandler, getKeyboardSelectionPolicy, getNodeInfo, getTreeViewModel, isKeyboardSelectionDisabled, isLeaf, setKeyboardSelectionPolicyclaimElement, getWidget, initializeClaimedElement, initWidget, isAttached, onAttach, onDetach, render, render, resolvePotentialElement, setWidgetaddAttachHandler, addBitlessDomHandler, addDomHandler, addHandler, asWidget, asWidgetOrNull, createHandlerManager, delegateEvent, doAttachChildren, doDetachChildren, fireEvent, getHandlerCount, getLayoutData, getParent, isOrWasAttached, onLoad, onUnload, removeFromParent, setLayoutData, sinkEvents, unsinkEventsaddStyleDependentName, addStyleName, ensureDebugId, ensureDebugId, ensureDebugId, getAbsoluteLeft, getAbsoluteTop, getElement, getOffsetHeight, getOffsetWidth, getStyleElement, getStyleName, getStyleName, getStylePrimaryName, getStylePrimaryName, getTitle, isVisible, isVisible, onEnsureDebugId, removeStyleDependentName, removeStyleName, setElement, setElement, setHeight, setPixelSize, setSize, setStyleDependentName, setStyleName, setStyleName, setStyleName, setStyleName, setStylePrimaryName, setStylePrimaryName, setTitle, setVisible, setVisible, setWidth, sinkBitlessEvent, toStringclone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, waitfireEventfinal java.util.List<CellBrowser.TreeNodeImpl<?>> treeNodes
CellBrowser.TreeNodeImpls. Visible for testing.@Deprecated public CellBrowser(TreeViewModel viewModel, T rootValue)
CellBrowser.BuilderCellBrowser.T - the type of data in the root nodeviewModel - the TreeViewModel that backs the treerootValue - the hidden root value of the tree@Deprecated public CellBrowser(TreeViewModel viewModel, T rootValue, CellBrowser.Resources resources)
CellBrowser.BuilderCellBrowser with the specified CellBrowser.Resources.T - the type of data in the root nodeviewModel - the TreeViewModel that backs the treerootValue - the hidden root value of the treeresources - the CellBrowser.Resources used for imagesprotected CellBrowser(CellBrowser.Builder<T> builder)
public int getDefaultColumnWidth()
setDefaultColumnWidth(int)public int getMinimumColumnWidth()
setMinimumColumnWidth(int)public TreeNode getRootTreeNode()
AbstractCellTreeTreeNode.getRootTreeNode in class AbstractCellTreeTreeNode at the root of the treepublic boolean isAnimationEnabled()
HasAnimationisAnimationEnabled in interface HasAnimationpublic void onBrowserEvent(Event event)
EventListeneronBrowserEvent in interface EventListeneronBrowserEvent in class Compositeevent - the event receivedpublic void onResize()
RequiresResizeonResize in interface RequiresResizepublic void setAnimationEnabled(boolean enable)
HasAnimationsetAnimationEnabled in interface HasAnimationenable - true to enable, false to disablepublic void setDefaultColumnWidth(int width)
width - the default width in pixelsgetDefaultColumnWidth()public void setMinimumColumnWidth(int minWidth)
minWidth - the minimum width in pixelsgetMinimumColumnWidth()