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textviewer.js
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textviewer.js
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/**
*/
function TextViewer(lowerBoundary) {
var self = this;
this.panels = [];
this.locationId = '';
this.maxHeight = $(lowerBoundary).offset().top;
$(window).bind('resize', function() {
self.onResize();
});
$(window).bind('scroll', function() {
self.onResize();
});
this.switches = { };
}
/**
* Adds a new TextPanel to the TextViewer.
* @param contentUrl Base URL to get content.
* @param textSelect Select element that defines the content.
* @param box Element to display the text.
* @param syncSelector Name of the element used to sync the different panels.
*/
TextViewer.prototype.addPanel = function(contentUrl, textSelect, box,
syncSelector) {
this.panels.push(new TextPanel(this, this.panels.length, contentUrl,
textSelect, box, syncSelector));
};
/**
* Returns the TextViewer maximum height.
*/
TextViewer.prototype.getMaxHeight = function() {
return this.maxHeight;
};
TextViewer.prototype.getSwitch = function(name) {
return this.switches[name];
};
TextViewer.prototype.setSwitch = function(name, value) {
this.switches[name] = value;
};
/**
* Handle resize events.
*/
TextViewer.prototype.onResize = function() {
for (panel in this.panels) {
this.panels[panel].onResize();
}
};
TextViewer.prototype.synchronisePanels = function(referencePanel) {
if (!this.getSwitch('sync')) {
return;
}
this.highlight(this.locationId, false, false);
this.locationId = referencePanel.getLocationId();
this.highlight(this.locationId, true, true);
for (i in this.panels) {
var panel = this.panels[i];
if (panel != referencePanel) {
panel.syncToLocationId(this.locationId);
}
}
};
TextViewer.prototype.highlight = function(locationId, active, bothPanes) {
if (!this.getSwitch('highlight')) {
return;
}
var elements = $('*[data-text-id = ' + locationId + ']');
if (!bothPanes || elements.length > 1) {
$.each(elements, function(i, element) {
var obj = $(element);
if (obj.children().length < 1) {
obj = obj.parent();
}
if (active) {
obj.addClass('highlight');
} else {
obj.removeClass('highlight');
}
});
}
};
/**
* Updates the location.
*/
TextViewer.prototype.updateLocation = function() {
var hash = '';
for (panel in this.panels) {
if (panel > 0) {
hash += '/';
}
hash += this.panels[panel].getLocation();
}
location.hash = hash;
};
/**
*/
function TextPanel(viewer, position, contentUrl, textSelect, box, syncSelector) {
var self = this;
this.viewer = viewer;
this.position = position;
this.contentUrl = contentUrl;
this.textSelect = textSelect;
this.box = box;
this.beingSynced = false;
this.locationId = '';
this.textSelect.change(function() {
self.onTextSelectChange();
});
this.bindOnScroll(true);
this.onResize();
this.onTextSelectChange();
}
/**
* Bind scroll event.
*/
TextPanel.prototype.bindOnScroll = function(bind) {
var self = this;
if (this.onScroll == null) {
this.onScroll = function(event) {
self.onVisibleContentChange($(event.target));
};
}
if (bind) {
this.box.bind('scroll', this.onScroll);
} else {
this.box.unbind('scroll', this.onScroll);
}
};
TextPanel.prototype.getFirstVisibleElement = function(selector, windowHeight) {
// get_first_visible_element($('.viewer-text-box'), 'p')
var ret = null;
if (windowHeight == null) {
windowHeight = 40;
}
var windowTop = this.box.offset().top;
var windowBottom = windowTop + windowHeight;
var elements = this.box.find(selector).each(function() {
var top = $(this).offset().top;
if (top <= windowBottom) {
ret = $(this);
}
return (top < windowTop);
});
return ret;
};
/**
* Returns the panel location.
*/
TextPanel.prototype.getLocation = function() {
return this.textSelect.val();
};
/**
* Returns the ID of the current place in the text.
*/
TextPanel.prototype.getLocationId = function() {
return this.locationId;
};
/**
* Loads the text at textUrl into this panel.
* @param textUrl URL fragment referencing the text to load
*/
TextPanel.prototype.loadSection = function(textUrl) {
this.box.html('<div class="spinner"> </div>');
$.ajax({
url: self.contentUrl + textUrl + '/',
async: false,
dataType: 'html',
type: 'GET',
success: function(data, textStatus, xhr) {
data = data.trim();
var toc = $(data).filter('#text-toc');
var content = $(data).filter('#text-content');
var toolBar = self.box.parent().find('.panel-tool-bar');
toolBar.find('#text-toc').remove();
toolBar.append(toc);
self.box.html(content);
}
});
this.viewer.updateLocation();
};
/**
* Handle resize events.
*/
TextPanel.prototype.onResize = function() {
var boxTop = this.box.offset().top;
var margin = 20;
var minHeight = 100;
var maxHeight = this.viewer.getMaxHeight() - boxTop - margin;
var height = $(window).height() - $('html').scrollTop() - boxTop - margin;
height = height > maxHeight ? maxHeight : height;
height = height < minHeight ? minHeight : height;
height = parseInt(height) + 'px';
this.box.css('height', height);
this.onVisibleContentChange();
};
/**
* Handle type changes, loads new content into the panel according to the type.
*/
TextPanel.prototype.onTextSelectChange = function() {
var self = this;
var textUrl = this.getLocation();
if (textUrl && textUrl.length > 0) {
this.loadSection(textUrl);
} else {
this.box.html('');
this.viewer.updateLocation();
}
};
/**
* Handle changes to the box content.
*/
TextPanel.prototype.onVisibleContentChange = function() {
var element = this.getFirstVisibleElement('*[data-text-id]');
this.locationId = element ? element.attr('data-text-id') : '';
if (!this.beingSynced) {
this.viewer.synchronisePanels(this);
}
this.beingSynced = false;
};
TextPanel.prototype.scrollBoxToElement = function(element) {
var ret = false;
if (element.offset()) {
var before = this.box.scrollTop();
this.box.scrollTop(element.offset().top - this.box.offset().top +
before);
if (this.box.scrollTop() == before) {
this.beingSynced = false;
}
ret = true;
}
return ret;
};
TextPanel.prototype.setLocationId = function(locationId) {
var element = this.box.find('*[data-text-id=' + locationId + ']').first();
return this.scrollBoxToElement(element);
};
TextPanel.prototype.syncToLocationId = function(locationId) {
this.beingSynced = true;
return this.setLocationId(locationId);
};