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viewer.js
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viewer.js
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/*
* OpenSeadragon - Viewer
*
* Copyright (C) 2009 CodePlex Foundation
* Copyright (C) 2010-2024 OpenSeadragon contributors
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of CodePlex Foundation nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
(function( $ ){
// dictionary from hash to private properties
var THIS = {};
var nextHash = 1;
/**
*
* The main point of entry into creating a zoomable image on the page.<br>
* <br>
* We have provided an idiomatic javascript constructor which takes
* a single object, but still support the legacy positional arguments.<br>
* <br>
* The options below are given in order that they appeared in the constructor
* as arguments and we translate a positional call into an idiomatic call.<br>
* <br>
* To create a viewer, you can use either of this methods:<br>
* <ul>
* <li><code>var viewer = new OpenSeadragon.Viewer(options);</code></li>
* <li><code>var viewer = OpenSeadragon(options);</code></li>
* </ul>
* @class Viewer
* @classdesc The main OpenSeadragon viewer class.
*
* @memberof OpenSeadragon
* @extends OpenSeadragon.EventSource
* @extends OpenSeadragon.ControlDock
* @param {OpenSeadragon.Options} options - Viewer options.
*
**/
$.Viewer = function( options ) {
var args = arguments,
_this = this,
i;
//backward compatibility for positional args while preferring more
//idiomatic javascript options object as the only argument
if( !$.isPlainObject( options ) ){
options = {
id: args[ 0 ],
xmlPath: args.length > 1 ? args[ 1 ] : undefined,
prefixUrl: args.length > 2 ? args[ 2 ] : undefined,
controls: args.length > 3 ? args[ 3 ] : undefined,
overlays: args.length > 4 ? args[ 4 ] : undefined
};
}
//options.config and the general config argument are deprecated
//in favor of the more direct specification of optional settings
//being pass directly on the options object
if ( options.config ){
$.extend( true, options, options.config );
delete options.config;
}
// Move deprecated drawer options from the base options object into a sub-object
// This is an array to make it easy to add additional properties to convert to
// drawer options later if it makes sense to set at the drawer level rather than
// per tiled image (for example, subPixelRoundingForTransparency).
let drawerOptionList = [
'useCanvas', // deprecated
];
options.drawerOptions = Object.assign({},
drawerOptionList.reduce((drawerOptions, option) => {
drawerOptions[option] = options[option];
delete options[option];
return drawerOptions;
}, {}),
options.drawerOptions);
//Public properties
//Allow the options object to override global defaults
$.extend( true, this, {
//internal state and dom identifiers
id: options.id,
hash: options.hash || nextHash++,
/**
* Index for page to be shown first next time open() is called (only used in sequenceMode).
* @member {Number} initialPage
* @memberof OpenSeadragon.Viewer#
*/
initialPage: 0,
//dom nodes
/**
* The parent element of this Viewer instance, passed in when the Viewer was created.
* @member {Element} element
* @memberof OpenSeadragon.Viewer#
*/
element: null,
/**
* A <div> element (provided by {@link OpenSeadragon.ControlDock}), the base element of this Viewer instance.<br><br>
* Child element of {@link OpenSeadragon.Viewer#element}.
* @member {Element} container
* @memberof OpenSeadragon.Viewer#
*/
container: null,
/**
* A <div> element, the element where user-input events are handled for panning and zooming.<br><br>
* Child element of {@link OpenSeadragon.Viewer#container},
* positioned on top of {@link OpenSeadragon.Viewer#keyboardCommandArea}.<br><br>
* The parent of {@link OpenSeadragon.Drawer#canvas} instances.
* @member {Element} canvas
* @memberof OpenSeadragon.Viewer#
*/
canvas: null,
// Overlays list. An overlay allows to add html on top of the viewer.
overlays: [],
// Container inside the canvas where overlays are drawn.
overlaysContainer: null,
//private state properties
previousBody: [],
//This was originally initialized in the constructor and so could never
//have anything in it. now it can because we allow it to be specified
//in the options and is only empty by default if not specified. Also
//this array was returned from get_controls which I find confusing
//since this object has a controls property which is treated in other
//functions like clearControls. I'm removing the accessors.
customControls: [],
//These are originally not part options but declared as members
//in initialize. It's still considered idiomatic to put them here
//source is here for backwards compatibility. It is not an official
//part of the API and should not be relied upon.
source: null,
/**
* Handles rendering of tiles in the viewer. Created for each TileSource opened.
* @member {OpenSeadragon.Drawer} drawer
* @memberof OpenSeadragon.Viewer#
*/
drawer: null,
/**
* Keeps track of all of the tiled images in the scene.
* @member {OpenSeadragon.World} world
* @memberof OpenSeadragon.Viewer#
*/
world: null,
/**
* Handles coordinate-related functionality - zoom, pan, rotation, etc. Created for each TileSource opened.
* @member {OpenSeadragon.Viewport} viewport
* @memberof OpenSeadragon.Viewer#
*/
viewport: null,
/**
* @member {OpenSeadragon.Navigator} navigator
* @memberof OpenSeadragon.Viewer#
*/
navigator: null,
//A collection viewport is a separate viewport used to provide
//simultaneous rendering of sets of tiles
collectionViewport: null,
collectionDrawer: null,
//UI image resources
//TODO: rename navImages to uiImages
navImages: null,
//interface button controls
buttonGroup: null,
//TODO: this is defunct so safely remove it
profiler: null
}, $.DEFAULT_SETTINGS, options );
if ( typeof ( this.hash) === "undefined" ) {
throw new Error("A hash must be defined, either by specifying options.id or options.hash.");
}
if ( typeof ( THIS[ this.hash ] ) !== "undefined" ) {
// We don't want to throw an error here, as the user might have discarded
// the previous viewer with the same hash and now want to recreate it.
$.console.warn("Hash " + this.hash + " has already been used.");
}
//Private state properties
THIS[ this.hash ] = {
fsBoundsDelta: new $.Point( 1, 1 ),
prevContainerSize: null,
animating: false,
forceRedraw: false,
needsResize: false,
forceResize: false,
mouseInside: false,
group: null,
// whether we should be continuously zooming
zooming: false,
// how much we should be continuously zooming by
zoomFactor: null,
lastZoomTime: null,
fullPage: false,
onfullscreenchange: null,
lastClickTime: null,
draggingToZoom: false,
};
this._sequenceIndex = 0;
this._firstOpen = true;
this._updateRequestId = null;
this._loadQueue = [];
this.currentOverlays = [];
this._updatePixelDensityRatioBind = null;
this._lastScrollTime = $.now(); // variable used to help normalize the scroll event speed of different devices
//Inherit some behaviors and properties
$.EventSource.call( this );
this.addHandler( 'open-failed', function ( event ) {
var msg = $.getString( "Errors.OpenFailed", event.eventSource, event.message);
_this._showMessage( msg );
});
$.ControlDock.call( this, options );
//Deal with tile sources
if (this.xmlPath) {
//Deprecated option. Now it is preferred to use the tileSources option
this.tileSources = [ this.xmlPath ];
}
this.element = this.element || document.getElementById( this.id );
this.canvas = $.makeNeutralElement( "div" );
this.canvas.className = "openseadragon-canvas";
(function( style ){
style.width = "100%";
style.height = "100%";
style.overflow = "hidden";
style.position = "absolute";
style.top = "0px";
style.left = "0px";
}(this.canvas.style));
$.setElementTouchActionNone( this.canvas );
if (options.tabIndex !== "") {
this.canvas.tabIndex = (options.tabIndex === undefined ? 0 : options.tabIndex);
}
//the container is created through applying the ControlDock constructor above
this.container.className = "openseadragon-container";
(function( style ){
style.width = "100%";
style.height = "100%";
style.position = "relative";
style.overflow = "hidden";
style.left = "0px";
style.top = "0px";
style.textAlign = "left"; // needed to protect against
}( this.container.style ));
$.setElementTouchActionNone( this.container );
this.container.insertBefore( this.canvas, this.container.firstChild );
this.element.appendChild( this.container );
//Used for toggling between fullscreen and default container size
//TODO: these can be closure private and shared across Viewer
// instances.
this.bodyWidth = document.body.style.width;
this.bodyHeight = document.body.style.height;
this.bodyOverflow = document.body.style.overflow;
this.docOverflow = document.documentElement.style.overflow;
this.innerTracker = new $.MouseTracker({
userData: 'Viewer.innerTracker',
element: this.canvas,
startDisabled: !this.mouseNavEnabled,
clickTimeThreshold: this.clickTimeThreshold,
clickDistThreshold: this.clickDistThreshold,
dblClickTimeThreshold: this.dblClickTimeThreshold,
dblClickDistThreshold: this.dblClickDistThreshold,
contextMenuHandler: $.delegate( this, onCanvasContextMenu ),
keyDownHandler: $.delegate( this, onCanvasKeyDown ),
keyHandler: $.delegate( this, onCanvasKeyPress ),
clickHandler: $.delegate( this, onCanvasClick ),
dblClickHandler: $.delegate( this, onCanvasDblClick ),
dragHandler: $.delegate( this, onCanvasDrag ),
dragEndHandler: $.delegate( this, onCanvasDragEnd ),
enterHandler: $.delegate( this, onCanvasEnter ),
leaveHandler: $.delegate( this, onCanvasLeave ),
pressHandler: $.delegate( this, onCanvasPress ),
releaseHandler: $.delegate( this, onCanvasRelease ),
nonPrimaryPressHandler: $.delegate( this, onCanvasNonPrimaryPress ),
nonPrimaryReleaseHandler: $.delegate( this, onCanvasNonPrimaryRelease ),
scrollHandler: $.delegate( this, onCanvasScroll ),
pinchHandler: $.delegate( this, onCanvasPinch ),
focusHandler: $.delegate( this, onCanvasFocus ),
blurHandler: $.delegate( this, onCanvasBlur ),
});
this.outerTracker = new $.MouseTracker({
userData: 'Viewer.outerTracker',
element: this.container,
startDisabled: !this.mouseNavEnabled,
clickTimeThreshold: this.clickTimeThreshold,
clickDistThreshold: this.clickDistThreshold,
dblClickTimeThreshold: this.dblClickTimeThreshold,
dblClickDistThreshold: this.dblClickDistThreshold,
enterHandler: $.delegate( this, onContainerEnter ),
leaveHandler: $.delegate( this, onContainerLeave )
});
if( this.toolbar ){
this.toolbar = new $.ControlDock({ element: this.toolbar });
}
this.bindStandardControls();
THIS[ this.hash ].prevContainerSize = _getSafeElemSize( this.container );
if(window.ResizeObserver){
this._autoResizePolling = false;
this._resizeObserver = new ResizeObserver(function(){
THIS[_this.hash].needsResize = true;
});
this._resizeObserver.observe(this.container, {});
} else {
this._autoResizePolling = true;
}
// Create the world
this.world = new $.World({
viewer: this
});
this.world.addHandler('add-item', function(event) {
// For backwards compatibility, we maintain the source property
_this.source = _this.world.getItemAt(0).source;
THIS[ _this.hash ].forceRedraw = true;
if (!_this._updateRequestId) {
_this._updateRequestId = scheduleUpdate( _this, updateMulti );
}
});
this.world.addHandler('remove-item', function(event) {
// For backwards compatibility, we maintain the source property
if (_this.world.getItemCount()) {
_this.source = _this.world.getItemAt(0).source;
} else {
_this.source = null;
}
THIS[ _this.hash ].forceRedraw = true;
});
this.world.addHandler('metrics-change', function(event) {
if (_this.viewport) {
_this.viewport._setContentBounds(_this.world.getHomeBounds(), _this.world.getContentFactor());
}
});
this.world.addHandler('item-index-change', function(event) {
// For backwards compatibility, we maintain the source property
_this.source = _this.world.getItemAt(0).source;
});
// Create the viewport
this.viewport = new $.Viewport({
containerSize: THIS[ this.hash ].prevContainerSize,
springStiffness: this.springStiffness,
animationTime: this.animationTime,
minZoomImageRatio: this.minZoomImageRatio,
maxZoomPixelRatio: this.maxZoomPixelRatio,
visibilityRatio: this.visibilityRatio,
wrapHorizontal: this.wrapHorizontal,
wrapVertical: this.wrapVertical,
defaultZoomLevel: this.defaultZoomLevel,
minZoomLevel: this.minZoomLevel,
maxZoomLevel: this.maxZoomLevel,
viewer: this,
degrees: this.degrees,
flipped: this.flipped,
overlayPreserveContentDirection: this.overlayPreserveContentDirection,
navigatorRotate: this.navigatorRotate,
homeFillsViewer: this.homeFillsViewer,
margins: this.viewportMargins,
silenceMultiImageWarnings: this.silenceMultiImageWarnings
});
this.viewport._setContentBounds(this.world.getHomeBounds(), this.world.getContentFactor());
// Create the image loader
this.imageLoader = new $.ImageLoader({
jobLimit: this.imageLoaderLimit,
timeout: options.timeout,
tileRetryMax: this.tileRetryMax,
tileRetryDelay: this.tileRetryDelay
});
// Create the tile cache
this.tileCache = new $.TileCache({
maxImageCacheCount: this.maxImageCacheCount
});
//Create the drawer based on selected options
if (Object.prototype.hasOwnProperty.call(this.drawerOptions, 'useCanvas') ){
$.console.error('useCanvas is deprecated, use the "drawer" option to indicate preferred drawer(s)');
// for backwards compatibility, use HTMLDrawer if useCanvas is defined and is falsey
if (!this.drawerOptions.useCanvas){
this.drawer = $.HTMLDrawer;
}
delete this.drawerOptions.useCanvas;
}
let drawerCandidates = Array.isArray(this.drawer) ? this.drawer : [this.drawer];
if (drawerCandidates.length === 0){
// if an empty array was passed in, throw a warning and use the defaults
// note: if the drawer option is not specified, the defaults will already be set so this won't apply
drawerCandidates = [$.DEFAULT_SETTINGS.drawer].flat(); // ensure it is a list
$.console.warn('No valid drawers were selected. Using the default value.');
}
this.drawer = null;
for (const drawerCandidate of drawerCandidates){
let success = this.requestDrawer(drawerCandidate, {mainDrawer: true, redrawImmediately: false});
if(success){
break;
}
}
if (!this.drawer){
$.console.error('No drawer could be created!');
throw('Error with creating the selected drawer(s)');
}
// Pass the imageSmoothingEnabled option along to the drawer
this.drawer.setImageSmoothingEnabled(this.imageSmoothingEnabled);
// Overlay container
this.overlaysContainer = $.makeNeutralElement( "div" );
this.canvas.appendChild( this.overlaysContainer );
// Now that we have a drawer, see if it supports rotate. If not we need to remove the rotate buttons
if (!this.drawer.canRotate()) {
// Disable/remove the rotate left/right buttons since they aren't supported
if (this.rotateLeft) {
i = this.buttonGroup.buttons.indexOf(this.rotateLeft);
this.buttonGroup.buttons.splice(i, 1);
this.buttonGroup.element.removeChild(this.rotateLeft.element);
}
if (this.rotateRight) {
i = this.buttonGroup.buttons.indexOf(this.rotateRight);
this.buttonGroup.buttons.splice(i, 1);
this.buttonGroup.element.removeChild(this.rotateRight.element);
}
}
this._addUpdatePixelDensityRatioEvent();
//Instantiate a navigator if configured
if ( this.showNavigator){
this.navigator = new $.Navigator({
element: this.navigatorElement,
id: this.navigatorId,
position: this.navigatorPosition,
sizeRatio: this.navigatorSizeRatio,
maintainSizeRatio: this.navigatorMaintainSizeRatio,
top: this.navigatorTop,
left: this.navigatorLeft,
width: this.navigatorWidth,
height: this.navigatorHeight,
autoResize: this.navigatorAutoResize,
autoFade: this.navigatorAutoFade,
prefixUrl: this.prefixUrl,
viewer: this,
navigatorRotate: this.navigatorRotate,
background: this.navigatorBackground,
opacity: this.navigatorOpacity,
borderColor: this.navigatorBorderColor,
displayRegionColor: this.navigatorDisplayRegionColor,
crossOriginPolicy: this.crossOriginPolicy,
animationTime: this.animationTime,
drawer: this.drawer.getType(),
loadTilesWithAjax: this.loadTilesWithAjax,
ajaxHeaders: this.ajaxHeaders,
ajaxWithCredentials: this.ajaxWithCredentials,
});
}
// Sequence mode
if (this.sequenceMode) {
this.bindSequenceControls();
}
// Open initial tilesources
if (this.tileSources) {
this.open( this.tileSources );
}
// Add custom controls
for ( i = 0; i < this.customControls.length; i++ ) {
this.addControl(
this.customControls[ i ].id,
{anchor: this.customControls[ i ].anchor}
);
}
// Initial fade out
$.requestAnimationFrame( function(){
beginControlsAutoHide( _this );
} );
// Register the viewer
$._viewers.set(this.element, this);
};
$.extend( $.Viewer.prototype, $.EventSource.prototype, $.ControlDock.prototype, /** @lends OpenSeadragon.Viewer.prototype */{
/**
* @function
* @returns {Boolean}
*/
isOpen: function () {
return !!this.world.getItemCount();
},
// deprecated
openDzi: function ( dzi ) {
$.console.error( "[Viewer.openDzi] this function is deprecated; use Viewer.open() instead." );
return this.open( dzi );
},
// deprecated
openTileSource: function ( tileSource ) {
$.console.error( "[Viewer.openTileSource] this function is deprecated; use Viewer.open() instead." );
return this.open( tileSource );
},
//deprecated
get buttons () {
$.console.warn('Viewer.buttons is deprecated; Please use Viewer.buttonGroup');
return this.buttonGroup;
},
/**
* Open tiled images into the viewer, closing any others.
* To get the TiledImage instance created by open, add an event listener for
* {@link OpenSeadragon.Viewer.html#.event:open}, which when fired can be used to get access
* to the instance, i.e., viewer.world.getItemAt(0).
* @function
* @param {Array|String|Object|Function} tileSources - This can be a TiledImage
* specifier, a TileSource specifier, or an array of either. A TiledImage specifier
* is the same as the options parameter for {@link OpenSeadragon.Viewer#addTiledImage},
* except for the index property; images are added in sequence.
* A TileSource specifier is anything you could pass as the tileSource property
* of the options parameter for {@link OpenSeadragon.Viewer#addTiledImage}.
* @param {Number} initialPage - If sequenceMode is true, display this page initially
* for the given tileSources. If specified, will overwrite the Viewer's existing initialPage property.
* @returns {OpenSeadragon.Viewer} Chainable.
* @fires OpenSeadragon.Viewer.event:open
* @fires OpenSeadragon.Viewer.event:open-failed
*/
open: function (tileSources, initialPage) {
var _this = this;
this.close();
if (!tileSources) {
return this;
}
if (this.sequenceMode && $.isArray(tileSources)) {
if (this.referenceStrip) {
this.referenceStrip.destroy();
this.referenceStrip = null;
}
if (typeof initialPage !== 'undefined' && !isNaN(initialPage)) {
this.initialPage = initialPage;
}
this.tileSources = tileSources;
this._sequenceIndex = Math.max(0, Math.min(this.tileSources.length - 1, this.initialPage));
if (this.tileSources.length) {
this.open(this.tileSources[this._sequenceIndex]);
if ( this.showReferenceStrip ){
this.addReferenceStrip();
}
}
this._updateSequenceButtons( this._sequenceIndex );
return this;
}
if (!$.isArray(tileSources)) {
tileSources = [tileSources];
}
if (!tileSources.length) {
return this;
}
this._opening = true;
var expected = tileSources.length;
var successes = 0;
var failures = 0;
var failEvent;
var checkCompletion = function() {
if (successes + failures === expected) {
if (successes) {
if (_this._firstOpen || !_this.preserveViewport) {
_this.viewport.goHome( true );
_this.viewport.update();
}
_this._firstOpen = false;
var source = tileSources[0];
if (source.tileSource) {
source = source.tileSource;
}
// Global overlays
if( _this.overlays && !_this.preserveOverlays ){
for ( var i = 0; i < _this.overlays.length; i++ ) {
_this.currentOverlays[ i ] = getOverlayObject( _this, _this.overlays[ i ] );
}
}
_this._drawOverlays();
_this._opening = false;
/**
* Raised when the viewer has opened and loaded one or more TileSources.
*
* @event open
* @memberof OpenSeadragon.Viewer
* @type {object}
* @property {OpenSeadragon.Viewer} eventSource - A reference to the Viewer which raised the event.
* @property {OpenSeadragon.TileSource} source - The tile source that was opened.
* @property {?Object} userData - Arbitrary subscriber-defined object.
*/
// TODO: what if there are multiple sources?
_this.raiseEvent( 'open', { source: source } );
} else {
_this._opening = false;
/**
* Raised when an error occurs loading a TileSource.
*
* @event open-failed
* @memberof OpenSeadragon.Viewer
* @type {object}
* @property {OpenSeadragon.Viewer} eventSource - A reference to the Viewer which raised the event.
* @property {String} message - Information about what failed.
* @property {String} source - The tile source that failed.
* @property {?Object} userData - Arbitrary subscriber-defined object.
*/
_this.raiseEvent( 'open-failed', failEvent );
}
}
};
var doOne = function(options) {
if (!$.isPlainObject(options) || !options.tileSource) {
options = {
tileSource: options
};
}
if (options.index !== undefined) {
$.console.error('[Viewer.open] setting indexes here is not supported; use addTiledImage instead');
delete options.index;
}
if (options.collectionImmediately === undefined) {
options.collectionImmediately = true;
}
var originalSuccess = options.success;
options.success = function(event) {
successes++;
// TODO: now that options has other things besides tileSource, the overlays
// should probably be at the options level, not the tileSource level.
if (options.tileSource.overlays) {
for (var i = 0; i < options.tileSource.overlays.length; i++) {
_this.addOverlay(options.tileSource.overlays[i]);
}
}
if (originalSuccess) {
originalSuccess(event);
}
checkCompletion();
};
var originalError = options.error;
options.error = function(event) {
failures++;
if (!failEvent) {
failEvent = event;
}
if (originalError) {
originalError(event);
}
checkCompletion();
};
_this.addTiledImage(options);
};
// TileSources
for (var i = 0; i < tileSources.length; i++) {
doOne(tileSources[i]);
}
return this;
},
/**
* @function
* @returns {OpenSeadragon.Viewer} Chainable.
* @fires OpenSeadragon.Viewer.event:close
*/
close: function ( ) {
if ( !THIS[ this.hash ] ) {
//this viewer has already been destroyed: returning immediately
return this;
}
this._opening = false;
if ( this.navigator ) {
this.navigator.close();
}
if (!this.preserveOverlays) {
this.clearOverlays();
this.overlaysContainer.innerHTML = "";
}
THIS[ this.hash ].animating = false;
this.world.removeAll();
this.imageLoader.clear();
/**
* Raised when the viewer is closed (see {@link OpenSeadragon.Viewer#close}).
*
* @event close
* @memberof OpenSeadragon.Viewer
* @type {object}
* @property {OpenSeadragon.Viewer} eventSource - A reference to the Viewer which raised the event.
* @property {?Object} userData - Arbitrary subscriber-defined object.
*/
this.raiseEvent( 'close' );
return this;
},
/**
* Function to destroy the viewer and clean up everything created by OpenSeadragon.
*
* Example:
* var viewer = OpenSeadragon({
* [...]
* });
*
* //when you are done with the viewer:
* viewer.destroy();
* viewer = null; //important
*
* @function
* @fires OpenSeadragon.Viewer.event:before-destroy
* @fires OpenSeadragon.Viewer.event:destroy
*/
destroy: function( ) {
if ( !THIS[ this.hash ] ) {
//this viewer has already been destroyed: returning immediately
return;
}
/**
* Raised when the viewer is about to be destroyed (see {@link OpenSeadragon.Viewer#before-destroy}).
*
* @event before-destroy
* @memberof OpenSeadragon.Viewer
* @type {object}
* @property {OpenSeadragon.Viewer} eventSource - A reference to the Viewer which raised the event.
* @property {?Object} userData - Arbitrary subscriber-defined object.
*/
this.raiseEvent( 'before-destroy' );
this._removeUpdatePixelDensityRatioEvent();
this.close();
this.clearOverlays();
this.overlaysContainer.innerHTML = "";
//TODO: implement this...
//this.unbindSequenceControls()
//this.unbindStandardControls()
if (this._resizeObserver){
this._resizeObserver.disconnect();
}
if (this.referenceStrip) {
this.referenceStrip.destroy();
this.referenceStrip = null;
}
if ( this._updateRequestId !== null ) {
$.cancelAnimationFrame( this._updateRequestId );
this._updateRequestId = null;
}
if ( this.drawer ) {
this.drawer.destroy();
}
if ( this.navigator ) {
this.navigator.destroy();
THIS[ this.navigator.hash ] = null;
delete THIS[ this.navigator.hash ];
this.navigator = null;
}
if (this.buttonGroup) {
this.buttonGroup.destroy();
} else if (this.customButtons) {
while (this.customButtons.length) {
this.customButtons.pop().destroy();
}
}
if (this.paging) {
this.paging.destroy();
}
// Go through top element (passed to us) and remove all children
// Use removeChild to make sure it handles SVG or any non-html
// also it performs better - http://jsperf.com/innerhtml-vs-removechild/15
if (this.element){
while (this.element.firstChild) {
this.element.removeChild(this.element.firstChild);
}
}
this.container.onsubmit = null;
this.clearControls();
// destroy the mouse trackers
if (this.innerTracker){
this.innerTracker.destroy();
}
if (this.outerTracker){
this.outerTracker.destroy();
}
THIS[ this.hash ] = null;
delete THIS[ this.hash ];
// clear all our references to dom objects
this.canvas = null;
this.container = null;
// Unregister the viewer
$._viewers.delete(this.element);
// clear our reference to the main element - they will need to pass it in again, creating a new viewer
this.element = null;
/**
* Raised when the viewer is destroyed (see {@link OpenSeadragon.Viewer#destroy}).
*
* @event destroy
* @memberof OpenSeadragon.Viewer
* @type {object}
* @property {OpenSeadragon.Viewer} eventSource - A reference to the Viewer which raised the event.
* @property {?Object} userData - Arbitrary subscriber-defined object.
*/
this.raiseEvent( 'destroy' );
this.removeAllHandlers();
},
/**
* Request a drawer for this viewer, as a supported string or drawer constructor.
* @param {String | OpenSeadragon.DrawerBase} drawerCandidate The type of drawer to try to construct.
* @param { Object } options
* @param { Boolean } [options.mainDrawer] Whether to use this as the viewer's main drawer. Default = true.
* @param { Boolean } [options.redrawImmediately] Whether to immediately draw a new frame. Only used if options.mainDrawer = true. Default = true.
* @param { Object } [options.drawerOptions] Options for this drawer. Defaults to viewer.drawerOptions.
* for this viewer type. See {@link OpenSeadragon.Options}.
* @returns {Object | Boolean} The drawer that was created, or false if the requested drawer is not supported
*/
requestDrawer(drawerCandidate, options){
const defaultOpts = {
mainDrawer: true,
redrawImmediately: true,
drawerOptions: null
};
options = $.extend(true, defaultOpts, options);
const mainDrawer = options.mainDrawer;
const redrawImmediately = options.redrawImmediately;
const drawerOptions = options.drawerOptions;
const oldDrawer = this.drawer;
let Drawer = null;
//if the candidate inherits from a drawer base, use it
if (drawerCandidate && drawerCandidate.prototype instanceof $.DrawerBase) {
Drawer = drawerCandidate;
drawerCandidate = 'custom';
} else if (typeof drawerCandidate === "string") {
Drawer = $.determineDrawer(drawerCandidate);
}
if(!Drawer){
$.console.warn('Unsupported drawer! Drawer must be an existing string type, or a class that extends OpenSeadragon.DrawerBase.');
}
// if the drawer is supported, create it and return true
if (Drawer && Drawer.isSupported()) {
// first destroy the previous drawer
if(oldDrawer && mainDrawer){
oldDrawer.destroy();
}
// create the new drawer
const newDrawer = new Drawer({
viewer: this,
viewport: this.viewport,
element: this.canvas,
debugGridColor: this.debugGridColor,
options: drawerOptions || this.drawerOptions[drawerCandidate],
});
if(mainDrawer){
this.drawer = newDrawer;
if(redrawImmediately){
this.forceRedraw();
}
}
return newDrawer;
}
return false;
},