sku-pg
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Skulpt is a Javascript implementation of Python 2.x. Python that runs in your browser!
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JavaScript
// Copyright 2006 The Closure Library Authors. All Rights Reserved.
//
// 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.
/**
* @fileoverview Gmail-like AutoComplete logic.
*
*
* @see ../../demos/autocomplete-basic.html
*/
goog.provide('goog.ui.AutoComplete');
goog.provide('goog.ui.AutoComplete.EventType');
goog.require('goog.events');
goog.require('goog.events.EventTarget');
/**
* This is the central manager class for an AutoComplete instance.
*
* @param {Object} matcher A data source and row matcher, implements
* <code>requestMatchingRows(token, maxMatches, matchCallback)</code>.
* @param {goog.events.EventTarget} renderer An object that implements
* <code>
* isVisible():boolean<br>
* renderRows(rows:Array, token:string, target:Element);<br>
* hiliteId(row-id:number);<br>
* dismiss();<br>
* dispose():
* </code>.
* @param {Object} selectionHandler An object that implements
* <code>
* selectRow(row);<br>
* update(opt_force);
* </code>.
*
* @constructor
* @extends {goog.events.EventTarget}
*/
goog.ui.AutoComplete = function(matcher, renderer, selectionHandler) {
goog.events.EventTarget.call(this);
/**
* A data-source which provides autocomplete suggestions.
* @type {Object}
* @protected
* @suppress {underscore}
*/
this.matcher_ = matcher;
/**
* A handler which interacts with the input DOM element (textfield, textarea,
* or richedit).
* @type {Object}
* @protected
* @suppress {underscore}
*/
this.selectionHandler_ = selectionHandler;
/**
* A renderer to render/show/highlight/hide the autocomplete menu.
* @type {goog.events.EventTarget}
* @protected
* @suppress {underscore}
*/
this.renderer_ = renderer;
goog.events.listen(renderer, [
goog.ui.AutoComplete.EventType.HILITE,
goog.ui.AutoComplete.EventType.SELECT,
goog.ui.AutoComplete.EventType.CANCEL_DISMISS,
goog.ui.AutoComplete.EventType.DISMISS], this);
/**
* Currently typed token which will be used for completion.
* @type {?string}
* @protected
* @suppress {underscore}
*/
this.token_ = null;
/**
* Autcomplete suggestion items.
* @type {Array}
* @protected
* @suppress {underscore}
*/
this.rows_ = [];
/**
* Id of the currently highlighted row.
* @type {number}
* @protected
* @suppress {underscore}
*/
this.hiliteId_ = -1;
/**
* Id of the first row in autocomplete menu. Note that new ids are assigned
* everytime new suggestions are fetched.
* @type {number}
* @protected
* @suppress {underscore}
*/
this.firstRowId_ = 0;
/**
* The target HTML node for displaying.
* @type {Element}
* @protected
* @suppress {underscore}
*/
this.target_ = null;
/**
* The timer id for dismissing autocomplete menu with a delay.
* @type {?number}
* @private
*/
this.dismissTimer_ = null;
};
goog.inherits(goog.ui.AutoComplete, goog.events.EventTarget);
/**
* The maximum number of matches that should be returned
* @type {number}
* @private
*/
goog.ui.AutoComplete.prototype.maxMatches_ = 10;
/**
* True iff the first row should automatically be highlighted
* @type {boolean}
* @private
*/
goog.ui.AutoComplete.prototype.autoHilite_ = true;
/**
* True iff the user can unhilight all rows by pressing the up arrow.
* @type {boolean}
* @private
*/
goog.ui.AutoComplete.prototype.allowFreeSelect_ = false;
/**
* Whether completion from suggestion triggers fetching new suggestion.
* @type {boolean}
* @private
*/
goog.ui.AutoComplete.prototype.triggerSuggestionsOnUpdate_ = false;
/**
* Events associated with the autocomplete
* @enum {string}
*/
goog.ui.AutoComplete.EventType = {
/** A row has been highlighted by the renderer */
HILITE: 'hilite',
/** A row has been selected by the renderer */
SELECT: 'select',
/** A dismiss event has occurred */
DISMISS: 'dismiss',
/** Event that cancels a dismiss event */
CANCEL_DISMISS: 'canceldismiss',
/**
* Field value was updated. A row field is included and is non-null when a
* row has been selected. The value of the row typically includes fields:
* contactData and formattedValue as well as a toString function (though none
* of these fields are guaranteed to exist). The row field may be used to
* return custom-type row data.
*/
UPDATE: 'update'
};
/**
* Returns the renderer that renders/shows/highlights/hides the autocomplete
* menu.
* @return {goog.events.EventTarget} Renderer used by the this widget.
*/
goog.ui.AutoComplete.prototype.getRenderer = function() {
return this.renderer_;
};
/**
* Generic event handler that handles any events this object is listening to.
* @param {goog.events.Event} e Event Object.
*/
goog.ui.AutoComplete.prototype.handleEvent = function(e) {
if (e.target == this.renderer_) {
switch (e.type) {
case goog.ui.AutoComplete.EventType.HILITE:
this.hiliteId(/** @type {number} */ (e.row));
break;
case goog.ui.AutoComplete.EventType.SELECT:
this.selectHilited();
break;
case goog.ui.AutoComplete.EventType.CANCEL_DISMISS:
this.cancelDelayedDismiss();
break;
case goog.ui.AutoComplete.EventType.DISMISS:
this.dismissOnDelay();
break;
}
}
};
/**
* Sets the max number of matches to fetch from the Matcher.
*
* @param {number} max Max number of matches.
*/
goog.ui.AutoComplete.prototype.setMaxMatches = function(max) {
this.maxMatches_ = max;
};
/**
* Sets whether or not the first row should be highlighted by default.
*
* @param {boolean} autoHilite true iff the first row should be
* highlighted by default.
*/
goog.ui.AutoComplete.prototype.setAutoHilite = function(autoHilite) {
this.autoHilite_ = autoHilite;
};
/**
* Sets whether or not the up arrow can unhilite all rows.
*
* @param {boolean} allowFreeSelect true iff the up arrow can unhilite all rows.
*/
goog.ui.AutoComplete.prototype.setAllowFreeSelect = function(allowFreeSelect) {
this.allowFreeSelect_ = allowFreeSelect;
};
/**
* Sets whether or not to request new suggestions immediately after completion
* of a suggestion.
*
* @param {boolean} triggerSuggestionsOnUpdate true iff completion should fetch
* new suggestions.
*/
goog.ui.AutoComplete.prototype.setTriggerSuggestionsOnUpdate = function(
triggerSuggestionsOnUpdate) {
this.triggerSuggestionsOnUpdate_ = triggerSuggestionsOnUpdate;
};
/**
* Sets the token to match against. This triggers calls to the Matcher to
* fetch the matches (up to maxMatches), and then it triggers a call to
* <code>renderer.renderRows()</code>.
*
* @param {string} token The string for which to search in the Matcher.
* @param {string=} opt_fullString Optionally, the full string in the input
* field.
*/
goog.ui.AutoComplete.prototype.setToken = function(token, opt_fullString) {
if (this.token_ == token) {
return;
}
this.token_ = token;
this.matcher_.requestMatchingRows(this.token_,
this.maxMatches_, goog.bind(this.matchListener_, this), opt_fullString);
this.cancelDelayedDismiss();
};
/**
* Gets the current target HTML node for displaying autocomplete UI.
* @return {Element} The current target HTML node for displaying autocomplete
* UI.
*/
goog.ui.AutoComplete.prototype.getTarget = function() {
return this.target_;
};
/**
* Sets the current target HTML node for displaying autocomplete UI.
* Can be an implementation specific definition of how to display UI in relation
* to the target node.
* This target will be passed into <code>renderer.renderRows()</code>
*
* @param {Element} target The current target HTML node for displaying
* autocomplete UI.
*/
goog.ui.AutoComplete.prototype.setTarget = function(target) {
this.target_ = target;
};
/**
* @return {boolean} Whether the autocomplete's renderer is open.
*/
goog.ui.AutoComplete.prototype.isOpen = function() {
return this.renderer_.isVisible();
};
/**
* Moves the hilite to the next row, or does nothing if we're already at the
* end of the current set of matches. Calls renderer.hiliteId() when there's
* something to do.
* @return {boolean} Returns true on a successful hilite.
*/
goog.ui.AutoComplete.prototype.hiliteNext = function() {
if (this.hiliteId_ >= this.firstRowId_ &&
this.hiliteId_ < this.firstRowId_ + this.rows_.length - 1) {
this.hiliteId(this.hiliteId_ + 1);
return true;
} else if (this.hiliteId_ == -1) {
this.hiliteId(this.firstRowId_);
return true;
}
return false;
};
/**
* Moves the hilite to the previous row, or does nothing if we're already at
* the beginning of the current set of matches. Calls renderer.hiliteId()
* when there's something to do.
* @return {boolean} Returns true on a successful hilite.
*/
goog.ui.AutoComplete.prototype.hilitePrev = function() {
if (this.hiliteId_ > this.firstRowId_) {
this.hiliteId(this.hiliteId_ - 1);
return true;
} else if (this.allowFreeSelect_ && this.hiliteId_ == this.firstRowId_) {
this.hiliteId(-1);
}
return false;
};
/**
* Hilites the id if it's valid, otherwise does nothing.
* @param {number} id A row id (not index).
* @return {boolean} Whether the id was hilited.
*/
goog.ui.AutoComplete.prototype.hiliteId = function(id) {
this.hiliteId_ = id;
this.renderer_.hiliteId(id);
return this.getIndexOfId(id) != -1;
};
/**
* If there are any current matches, this passes the hilited row data to
* <code>selectionHandler.selectRow()</code>
* @return {boolean} Whether there are any current matches.
*/
goog.ui.AutoComplete.prototype.selectHilited = function() {
var index = this.getIndexOfId(this.hiliteId_);
if (index != -1) {
var selectedRow = this.rows_[index];
var suppressUpdate = this.selectionHandler_.selectRow(selectedRow);
this.dismiss();
if (!suppressUpdate) {
this.dispatchEvent({
type: goog.ui.AutoComplete.EventType.UPDATE,
row: selectedRow
});
if (this.triggerSuggestionsOnUpdate_) {
this.selectionHandler_.update(true);
}
}
return true;
} else {
this.dismiss();
this.dispatchEvent(
{
type: goog.ui.AutoComplete.EventType.UPDATE,
row: null
});
return false;
}
};
/**
* Returns whether or not the autocomplete is open and has a highlighted row.
* @return {boolean} Whether an autocomplete row is highlighted.
*/
goog.ui.AutoComplete.prototype.hasHighlight = function() {
return this.isOpen() && this.getIndexOfId(this.hiliteId_) != -1;
};
/**
* Clears out the token, rows, and hilite, and calls
* <code>renderer.dismiss()</code>
*/
goog.ui.AutoComplete.prototype.dismiss = function() {
this.hiliteId_ = -1;
this.token_ = null;
this.firstRowId_ += this.rows_.length;
this.rows_ = [];
window.clearTimeout(this.dismissTimer_);
this.dismissTimer_ = null;
this.renderer_.dismiss();
};
/**
* Call a dismiss after a delay, if there's already a dismiss active, ignore.
*/
goog.ui.AutoComplete.prototype.dismissOnDelay = function() {
if (!this.dismissTimer_) {
this.dismissTimer_ = window.setTimeout(goog.bind(this.dismiss, this), 100);
}
};
/**
* Call a dismiss after a delay, if there's already a dismiss active, ignore.
*/
goog.ui.AutoComplete.prototype.cancelDelayedDismiss = function() {
window.setTimeout(goog.bind(function() {
if (this.dismissTimer_) {
window.clearTimeout(this.dismissTimer_);
this.dismissTimer_ = null;
}
}, this), 10);
};
/**
* Cleans up the autocomplete object.
*/
goog.ui.AutoComplete.prototype.disposeInternal = function() {
goog.ui.AutoComplete.superClass_.disposeInternal.call(this);
this.renderer_.dispose();
this.selectionHandler_.dispose();
this.matcher_ = null;
};
/**
* Callback passed to Matcher when requesting matches for a token.
* This might be called synchronously, or asynchronously, or both, for
* any implementation of a Matcher.
* If the Matcher calls this back, with the same token this AutoComplete
* has set currently, then this will package the matching rows in object
* of the form
* <pre>
* {
* id: an integer ID unique to this result set and AutoComplete instance,
* data: the raw row data from Matcher
* }
* </pre>
*
* @param {string} matchedToken Token that corresponds with the rows.
* @param {!Array} rows Set of data that match the given token.
* @param {boolean=} opt_preserveHilited If true, keeps the currently hilited
* (by index) element hilited.
*
* @private
*/
goog.ui.AutoComplete.prototype.matchListener_ = function(matchedToken, rows,
opt_preserveHilited) {
if (this.token_ != matchedToken) {
// Matcher's response token doesn't match current token.
// This is probably an async response that came in after
// the token was changed, so don't do anything.
return;
}
this.renderRows(rows, opt_preserveHilited);
};
/**
* Renders the rows and adds highlighting.
* @param {!Array} rows Set of data that match the given token.
* @param {boolean=} opt_preserveHilited If true, keeps the currently hilited
* (by index) element hilited.
*/
goog.ui.AutoComplete.prototype.renderRows = function(rows,
opt_preserveHilited) {
var indexToHilite = opt_preserveHilited ?
this.getIndexOfId(this.hiliteId_) : null;
// Current token matches the matcher's response token.
this.firstRowId_ += this.rows_.length;
this.rows_ = rows;
var rendRows = [];
for (var i = 0; i < rows.length; ++i) {
rendRows.push({
id: this.getIdOfIndex_(i),
data: rows[i]
});
}
this.renderer_.renderRows(rendRows, this.token_, this.target_);
if (this.autoHilite_ && rendRows.length != 0) {
var idToHilite = indexToHilite != null ?
this.getIdOfIndex_(indexToHilite) : this.firstRowId_;
this.hiliteId(idToHilite);
} else {
this.hiliteId_ = -1;
}
};
/**
* Gets the index corresponding to a particular id.
* @param {number} id A unique id for the row.
* @return {number} A valid index into rows_, or -1 if the id is invalid.
* @protected
*/
goog.ui.AutoComplete.prototype.getIndexOfId = function(id) {
var index = id - this.firstRowId_;
if (index < 0 || index >= this.rows_.length) {
return -1;
}
return index;
};
/**
* Gets the id corresponding to a particular index. (Does no checking.)
* @param {number} index The index of a row in the result set.
* @return {number} The id that currently corresponds to that index.
* @private
*/
goog.ui.AutoComplete.prototype.getIdOfIndex_ = function(index) {
return this.firstRowId_ + index;
};
/**
* Attach text areas or input boxes to the autocomplete by DOM reference. After
* elements are attached to the autocomplete, when a user types they will see
* the autocomplete drop down.
* @param {...Element} var_args Variable args: Input or text area elements to
* attach the autocomplete too.
*/
goog.ui.AutoComplete.prototype.attachInputs = function(var_args) {
// Delegate to the input handler
var inputHandler = /** @type {goog.ui.AutoComplete.InputHandler} */
(this.selectionHandler_);
inputHandler.attachInputs.apply(inputHandler, arguments);
};
/**
* Detach text areas or input boxes to the autocomplete by DOM reference.
* @param {...Element} var_args Variable args: Input or text area elements to
* detach from the autocomplete.
*/
goog.ui.AutoComplete.prototype.detachInputs = function(var_args) {
// Delegate to the input handler
var inputHandler = /** @type {goog.ui.AutoComplete.InputHandler} */
(this.selectionHandler_);
inputHandler.detachInputs.apply(inputHandler, arguments);
};