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| import {
clear as domClear,
delegate as domDelegate,
query as domQuery,
classes as domClasses,
attr as domAttr,
domify as domify
} from 'min-dom';
import {
getBBox as getBoundingBox
} from '../../util/Elements';
/**
* Provides searching infrastructure
*/
export default function SearchPad(canvas, eventBus, overlays, selection) {
this._open = false;
this._results = [];
this._eventMaps = [];
this._canvas = canvas;
this._eventBus = eventBus;
this._overlays = overlays;
this._selection = selection;
// setup elements
this._container = domify(SearchPad.BOX_HTML);
this._searchInput = domQuery(SearchPad.INPUT_SELECTOR, this._container);
this._resultsContainer = domQuery(SearchPad.RESULTS_CONTAINER_SELECTOR, this._container);
// attach search pad
this._canvas.getContainer().appendChild(this._container);
// cleanup on destroy
eventBus.on([ 'canvas.destroy', 'diagram.destroy' ], this.close, this);
}
SearchPad.$inject = [
'canvas',
'eventBus',
'overlays',
'selection'
];
/**
* Binds and keeps track of all event listereners
*/
SearchPad.prototype._bindEvents = function() {
var self = this;
function listen(el, selector, type, fn) {
self._eventMaps.push({
el: el,
type: type,
listener: domDelegate.bind(el, selector, type, fn)
});
}
// close search on clicking anywhere outside
listen(document, 'html', 'click', function(e) {
self.close();
}, true);
// stop event from propagating and closing search
// focus on input
listen(this._container, SearchPad.INPUT_SELECTOR, 'click', function(e) {
e.stopPropagation();
e.delegateTarget.focus();
});
// preselect result on hover
listen(this._container, SearchPad.RESULT_SELECTOR, 'mouseover', function(e) {
e.stopPropagation();
self._scrollToNode(e.delegateTarget);
self._preselect(e.delegateTarget);
});
// selects desired result on mouse click
listen(this._container, SearchPad.RESULT_SELECTOR, 'click', function(e) {
e.stopPropagation();
self._select(e.delegateTarget);
});
// prevent cursor in input from going left and right when using up/down to
// navigate results
listen(this._container, SearchPad.INPUT_SELECTOR, 'keydown', function(e) {
// up
if (e.keyCode === 38) {
e.preventDefault();
}
// down
if (e.keyCode === 40) {
e.preventDefault();
}
});
// handle keyboard input
listen(this._container, SearchPad.INPUT_SELECTOR, 'keyup', function(e) {
// escape
if (e.keyCode === 27) {
return self.close();
}
// enter
if (e.keyCode === 13) {
var selected = self._getCurrentResult();
return selected ? self._select(selected) : self.close();
}
// up
if (e.keyCode === 38) {
return self._scrollToDirection(true);
}
// down
if (e.keyCode === 40) {
return self._scrollToDirection();
}
// left && right
// do not search while navigating text input
if (e.keyCode === 37 || e.keyCode === 39) {
return;
}
// anything else
self._search(e.delegateTarget.value);
});
};
/**
* Unbinds all previously established listeners
*/
SearchPad.prototype._unbindEvents = function() {
this._eventMaps.forEach(function(m) {
domDelegate.unbind(m.el, m.type, m.listener);
});
};
/**
* Performs a search for the given pattern.
*
* @param {String} pattern
*/
SearchPad.prototype._search = function(pattern) {
var self = this;
this._clearResults();
// do not search on empty query
Iif (!pattern || pattern === '') {
return;
}
var searchResults = this._searchProvider.find(pattern);
if (!searchResults.length) {
return;
}
// append new results
searchResults.forEach(function(result) {
var id = result.element.id;
var node = self._createResultNode(result, id);
self._results[id] = {
element: result.element,
node: node
};
});
// preselect first result
var node = domQuery(SearchPad.RESULT_SELECTOR, this._resultsContainer);
this._scrollToNode(node);
this._preselect(node);
};
/**
* Navigate to the previous/next result. Defaults to next result.
* @param {Boolean} previous
*/
SearchPad.prototype._scrollToDirection = function(previous) {
var selected = this._getCurrentResult();
Iif (!selected) {
return;
}
var node = previous ? selected.previousElementSibling : selected.nextElementSibling;
Eif (node) {
this._scrollToNode(node);
this._preselect(node);
}
};
/**
* Scroll to the node if it is not visible.
*
* @param {Element} node
*/
SearchPad.prototype._scrollToNode = function(node) {
Iif (!node || node === this._getCurrentResult()) {
return;
}
var nodeOffset = node.offsetTop;
var containerScroll = this._resultsContainer.scrollTop;
var bottomScroll = nodeOffset - this._resultsContainer.clientHeight + node.clientHeight;
Iif (nodeOffset < containerScroll) {
this._resultsContainer.scrollTop = nodeOffset;
} else Iif (containerScroll < bottomScroll) {
this._resultsContainer.scrollTop = bottomScroll;
}
};
/**
* Clears all results data.
*/
SearchPad.prototype._clearResults = function() {
domClear(this._resultsContainer);
this._results = [];
this._resetOverlay();
this._eventBus.fire('searchPad.cleared');
};
/**
* Get currently selected result.
*
* @return {Element}
*/
SearchPad.prototype._getCurrentResult = function() {
return domQuery(SearchPad.RESULT_SELECTED_SELECTOR, this._resultsContainer);
};
/**
* Create result DOM element within results container
* that corresponds to a search result.
*
* 'result' : one of the elements returned by SearchProvider
* 'id' : id attribute value to assign to the new DOM node
* return : created DOM element
*
* @param {SearchResult} result
* @param {String} id
* @return {Element}
*/
SearchPad.prototype._createResultNode = function(result, id) {
var node = domify(SearchPad.RESULT_HTML);
// create only if available
Eif (result.primaryTokens.length > 0) {
createInnerTextNode(node, result.primaryTokens, SearchPad.RESULT_PRIMARY_HTML);
}
// secondary tokens (represent element ID) are allways available
createInnerTextNode(node, result.secondaryTokens, SearchPad.RESULT_SECONDARY_HTML);
domAttr(node, SearchPad.RESULT_ID_ATTRIBUTE, id);
this._resultsContainer.appendChild(node);
return node;
};
/**
* Register search element provider.
*
* SearchProvider.find - provides search function over own elements
* (pattern) => [{ text: <String>, element: <Element>}, ...]
*
* @param {SearchProvider} provider
*/
SearchPad.prototype.registerProvider = function(provider) {
this._searchProvider = provider;
};
/**
* Open search pad.
*/
SearchPad.prototype.open = function() {
if (!this._searchProvider) {
throw new Error('no search provider registered');
}
Iif (this.isOpen()) {
return;
}
this._bindEvents();
this._open = true;
domClasses(this._container).add('open');
this._searchInput.focus();
this._eventBus.fire('searchPad.opened');
};
/**
* Close search pad.
*/
SearchPad.prototype.close = function() {
if (!this.isOpen()) {
return;
}
this._unbindEvents();
this._open = false;
domClasses(this._container).remove('open');
this._clearResults();
this._searchInput.value = '';
this._searchInput.blur();
this._resetOverlay();
this._eventBus.fire('searchPad.closed');
};
/**
* Toggles search pad on/off.
*/
SearchPad.prototype.toggle = function() {
this.isOpen() ? this.close() : this.open();
};
/**
* Report state of search pad.
*/
SearchPad.prototype.isOpen = function() {
return this._open;
};
/**
* Preselect result entry.
*
* @param {Element} element
*/
SearchPad.prototype._preselect = function(node) {
var selectedNode = this._getCurrentResult();
// already selected
Iif (node === selectedNode) {
return;
}
// removing preselection from current node
if (selectedNode) {
domClasses(selectedNode).remove(SearchPad.RESULT_SELECTED_CLASS);
}
var id = domAttr(node, SearchPad.RESULT_ID_ATTRIBUTE);
var element = this._results[id].element;
domClasses(node).add(SearchPad.RESULT_SELECTED_CLASS);
this._resetOverlay(element);
this._centerViewbox(element);
this._selection.select(element);
this._eventBus.fire('searchPad.preselected', element);
};
/**
* Select result node.
*
* @param {Element} element
*/
SearchPad.prototype._select = function(node) {
var id = domAttr(node, SearchPad.RESULT_ID_ATTRIBUTE);
var element = this._results[id].element;
this.close();
this._resetOverlay();
this._centerViewbox(element);
this._selection.select(element);
this._eventBus.fire('searchPad.selected', element);
};
/**
* Center viewbox on the element middle point.
*
* @param {Element} element
*/
SearchPad.prototype._centerViewbox = function(element) {
var viewbox = this._canvas.viewbox();
var box = getBoundingBox(element);
var newViewbox = {
x: (box.x + box.width/2) - viewbox.outer.width/2,
y: (box.y + box.height/2) - viewbox.outer.height/2,
width: viewbox.outer.width,
height: viewbox.outer.height
};
this._canvas.viewbox(newViewbox);
this._canvas.zoom(viewbox.scale);
};
/**
* Reset overlay removes and, optionally, set
* overlay to a new element.
*
* @param {Element} element
*/
SearchPad.prototype._resetOverlay = function(element) {
if (this._overlayId) {
this._overlays.remove(this._overlayId);
}
if (element) {
var box = getBoundingBox(element);
var overlay = constructOverlay(box);
this._overlayId = this._overlays.add(element, overlay);
}
};
/**
* Construct overlay object for the given bounding box.
*
* @param {BoundingBox} box
* @return {Object}
*/
function constructOverlay(box) {
var offset = 6;
var w = box.width + offset * 2;
var h = box.height + offset * 2;
var styles = [
'width: '+ w +'px',
'height: '+ h + 'px'
].join('; ');
return {
position: {
bottom: h - offset,
right: w - offset
},
show: true,
html: '<div style="' + styles + '" class="' + SearchPad.OVERLAY_CLASS + '"></div>'
};
}
/**
* Creates and appends child node from result tokens and HTML template.
*
* @param {Element} node
* @param {Array<Object>} tokens
* @param {String} template
*/
function createInnerTextNode(parentNode, tokens, template) {
var text = createHtmlText(tokens);
var childNode = domify(template);
childNode.innerHTML = text;
parentNode.appendChild(childNode);
}
/**
* Create internal HTML markup from result tokens.
* Caters for highlighting pattern matched tokens.
*
* @param {Array<Object>} tokens
* @return {String}
*/
function createHtmlText(tokens) {
var htmlText = '';
tokens.forEach(function(t) {
if (t.matched) {
htmlText += '<strong class="' + SearchPad.RESULT_HIGHLIGHT_CLASS + '">' + t.matched + '</strong>';
} else {
htmlText += t.normal;
}
});
return htmlText !== '' ? htmlText : null;
}
/**
* CONSTANTS
*/
SearchPad.CONTAINER_SELECTOR = '.djs-search-container';
SearchPad.INPUT_SELECTOR = '.djs-search-input input';
SearchPad.RESULTS_CONTAINER_SELECTOR = '.djs-search-results';
SearchPad.RESULT_SELECTOR = '.djs-search-result';
SearchPad.RESULT_SELECTED_CLASS = 'djs-search-result-selected';
SearchPad.RESULT_SELECTED_SELECTOR = '.' + SearchPad.RESULT_SELECTED_CLASS;
SearchPad.RESULT_ID_ATTRIBUTE = 'data-result-id';
SearchPad.RESULT_HIGHLIGHT_CLASS = 'djs-search-highlight';
SearchPad.OVERLAY_CLASS = 'djs-search-overlay';
SearchPad.BOX_HTML =
'<div class="djs-search-container djs-draggable djs-scrollable">' +
'<div class="djs-search-input">' +
'<input type="text"/>' +
'</div>' +
'<div class="djs-search-results"></div>' +
'</div>';
SearchPad.RESULT_HTML =
'<div class="djs-search-result"></div>';
SearchPad.RESULT_PRIMARY_HTML =
'<div class="djs-search-result-primary"></div>';
SearchPad.RESULT_SECONDARY_HTML =
'<p class="djs-search-result-secondary"></p>';
|