/**
* Copyright 2011 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package org.waveprotocol.box.webclient.search;
import org.waveprotocol.box.webclient.client.ClientEvents;
import org.waveprotocol.box.webclient.client.events.WaveCreationEvent;
import org.waveprotocol.box.webclient.search.Search.State;
import org.waveprotocol.wave.client.account.Profile;
import org.waveprotocol.wave.client.account.ProfileListener;
import org.waveprotocol.wave.client.scheduler.Scheduler.IncrementalTask;
import org.waveprotocol.wave.client.scheduler.Scheduler.Task;
import org.waveprotocol.wave.client.scheduler.SchedulerInstance;
import org.waveprotocol.wave.client.scheduler.TimerService;
import org.waveprotocol.wave.client.widget.toolbar.GroupingToolbar;
import org.waveprotocol.wave.client.widget.toolbar.ToolbarButtonViewBuilder;
import org.waveprotocol.wave.client.widget.toolbar.ToolbarView;
import org.waveprotocol.wave.client.widget.toolbar.buttons.ToolbarClickButton;
import org.waveprotocol.wave.model.id.WaveId;
import org.waveprotocol.wave.model.util.CollectionUtils;
import org.waveprotocol.wave.model.util.IdentityMap;
import org.waveprotocol.wave.model.wave.SourcesEvents;
/**
* Presents a search model into a search view.
* <p>
* This class invokes rendering, and controls the lifecycle of digest views. It
* also handles all UI gesture events sourced from views in the search panel.
*
* @author hearnden@google.com (David Hearnden)
*/
public final class SearchPresenter
implements Search.Listener, SearchPanelView.Listener, SearchView.Listener, ProfileListener {
/**
* Handles wave actions.
*/
public interface WaveActionHandler {
/** Handles the wave creation action. */
void onCreateWave();
/** Handles a wave selection action. */
void onWaveSelected(WaveId id);
}
/** How often to repeat the search query. */
private final static int POLLING_INTERVAL_MS = 15000; // 15s
private final static String DEFAULT_SEARCH = "in:inbox";
private final static int DEFAULT_PAGE_SIZE = 20;
// External references
private final TimerService scheduler;
private final Search search;
private final SearchPanelView searchUi;
private final WaveActionHandler actionHandler;
// Internal state
private final IdentityMap<DigestView, Digest> digestUis = CollectionUtils.createIdentityMap();
private final IncrementalTask searchUpdater = new IncrementalTask() {
@Override
public boolean execute() {
doSearch();
return true;
}
};
private final Task renderer = new Task() {
@Override
public void execute() {
if (search.getState() == State.READY) {
render();
} else {
// Try again later.
scheduler.schedule(this);
}
}
};
/** Current search query. */
private String queryText = DEFAULT_SEARCH;
/** Number of results to query for. */
private int querySize = DEFAULT_PAGE_SIZE;
/** Current selected digest. */
private DigestView selected;
/** The dispatcher of profiles events. */
SourcesEvents<ProfileListener> profiles;
SearchPresenter(TimerService scheduler, Search search, SearchPanelView searchUi,
WaveActionHandler actionHandler, SourcesEvents<ProfileListener> profiles) {
this.search = search;
this.searchUi = searchUi;
this.scheduler = scheduler;
this.actionHandler = actionHandler;
this.profiles = profiles;
}
/**
* Creates a search presenter.
*
* @param model model to present
* @param view view to render into
* @param actionHandler handler for actions
* @param profileEventsDispatcher the dispatcher of profile events.
*/
public static SearchPresenter create(
Search model, SearchPanelView view, WaveActionHandler actionHandler,
SourcesEvents<ProfileListener> profileEventsDispatcher) {
SearchPresenter presenter = new SearchPresenter(
SchedulerInstance.getHighPriorityTimer(), model, view, actionHandler,
profileEventsDispatcher);
presenter.init();
return presenter;
}
/**
* Performs initial presentation, and attaches listeners to live objects.
*/
private void init() {
initToolbarMenu();
initSearchBox();
render();
search.addListener(this);
profiles.addListener(this);
searchUi.init(this);
searchUi.getSearch().init(this);
// Fire a polling search.
scheduler.scheduleRepeating(searchUpdater, 0, POLLING_INTERVAL_MS);
}
/**
* Releases resources and detaches listeners.
*/
public void destroy() {
scheduler.cancel(searchUpdater);
scheduler.cancel(renderer);
searchUi.getSearch().reset();
searchUi.reset();
search.removeListener(this);
profiles.removeListener(this);
}
/**
* Adds custom buttons to the toolbar.
*/
private void initToolbarMenu() {
GroupingToolbar.View toolbarUi = searchUi.getToolbar();
ToolbarView group = toolbarUi.addGroup();
new ToolbarButtonViewBuilder().setText("New Wave").applyTo(
group.addClickButton(), new ToolbarClickButton.Listener() {
@Override
public void onClicked() {
actionHandler.onCreateWave();
// HACK(hearnden): To mimic live search, fire a search poll
// reasonably soon (500ms) after creating a wave. This will be unnecessary
// with a real live search implementation. The delay is to give
// enough time for the wave state to propagate to the server.
int delay = 500;
scheduler.scheduleRepeating(searchUpdater, delay, POLLING_INTERVAL_MS);
}
});
// Fake group with empty button - to force the separator be displayed.
group = toolbarUi.addGroup();
new ToolbarButtonViewBuilder().setText("").applyTo(group.addClickButton(), null);
}
/**
* Initializes the search box.
*/
private void initSearchBox() {
searchUi.getSearch().setQuery(queryText);
}
/**
* Executes the current search.
*/
private void doSearch() {
search.find(queryText, querySize);
}
/**
* Renders the current state of the search result into the panel.
*/
private void render() {
renderTitle();
renderDigests();
renderShowMore();
}
/**
* Renders the paging information into the title bar.
*/
private void renderTitle() {
int resultEnd = querySize;
String totalStr;
if (search.getTotal() != Search.UNKNOWN_SIZE) {
resultEnd = Math.min(resultEnd, search.getTotal());
totalStr = String.valueOf(search.getTotal());
} else {
totalStr = "unknown";
}
searchUi.setTitleText(queryText + " (0-" + resultEnd + " of " + totalStr + ")");
}
private void renderDigests() {
// Preserve selection on re-rendering.
WaveId toSelect = selected != null ? digestUis.get(selected).getWaveId() : null;
searchUi.clearDigests();
digestUis.clear();
setSelected(null);
for (int i = 0, size = search.getMinimumTotal(); i < size; i++) {
Digest digest = search.getDigest(i);
if (digest == null) {
continue;
}
DigestView digestUi = searchUi.insertBefore(null, digest);
digestUis.put(digestUi, digest);
if (digest.getWaveId().equals(toSelect)) {
setSelected(digestUi);
}
}
}
private void renderShowMore() {
searchUi.setShowMoreVisible(
search.getTotal() == Search.UNKNOWN_SIZE || querySize < search.getTotal());
}
//
// UI gesture events.
//
private void setSelected(DigestView digestUi) {
if (selected != null) {
selected.deselect();
}
selected = digestUi;
if (selected != null) {
selected.select();
}
}
/**
* Invokes the wave-select action on the currently selected digest.
*/
private void openSelected() {
actionHandler.onWaveSelected(digestUis.get(selected).getWaveId());
}
@Override
public void onClicked(DigestView digestUi) {
setSelected(digestUi);
openSelected();
}
@Override
public void onQueryEntered() {
queryText = searchUi.getSearch().getQuery();
querySize = DEFAULT_PAGE_SIZE;
searchUi.setTitleText("Searching...");
doSearch();
}
@Override
public void onShowMoreClicked() {
querySize += DEFAULT_PAGE_SIZE;
doSearch();
}
//
// Search events. For now, dumbly re-render the whole list.
//
@Override
public void onStateChanged() {
//
// If the state switches to searching, then do nothing. A manual title-bar
// update is performed in onQueryEntered(), and the title-bar should not be
// updated when a polling search fires.
//
// If the state switches to ready, then just update the title. Do not
// necessarily re-render, since that is only necessary if a change occurred,
// which would have fired one of the other methods below.
//
if (search.getState() == State.READY) {
renderTitle();
}
}
@Override
public void onDigestAdded(int index, Digest digest) {
renderLater();
}
@Override
public void onDigestRemoved(int index, Digest digest) {
renderLater();
}
@Override
public void onDigestReady(int index, Digest digest) {
renderLater();
}
@Override
public void onTotalChanged(int total) {
renderLater();
}
private void renderLater() {
if (!scheduler.isScheduled(renderer)) {
scheduler.schedule(renderer);
}
}
@Override
public void onProfileUpdated(Profile profile) {
// NOTE: Search panel will be re-rendered once for every profile that comes
// back to the client. If this causes an efficiency problem then have the
// SearchPanelRenderer to be the profile listener, rather than
// SearchPresenter, and make it stateful. Have it remember which digests
// have used which profiles in their renderings.
renderLater();
}
}