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* VisualEditor ContentEditable Surface class.
*
* @copyright See AUTHORS.txt
*/
/**
* ContentEditable surface observer.
*
* @class
*
* @constructor
* @param {ve.ce.Surface} surface Surface to observe
*/
ve.ce.SurfaceObserver = function VeCeSurfaceObserver( surface ) {
// Properties
this.surface = surface;
this.domDocument = surface.attachedRoot.getElementDocument();
this.polling = false;
this.disabled = false;
this.timeoutId = null;
this.pollInterval = 250; // ms
this.rangeState = null;
};
/* Inheritance */
OO.initClass( ve.ce.SurfaceObserver );
/* Methods */
/**
* Clear polling data.
*/
ve.ce.SurfaceObserver.prototype.clear = function () {
this.rangeState = null;
};
/**
* Detach from the document view
*/
ve.ce.SurfaceObserver.prototype.detach = function () {
this.surface = null;
this.domDocument = null;
this.rangeState = null;
};
/**
* Start the setTimeout synchronisation loop
*/
ve.ce.SurfaceObserver.prototype.startTimerLoop = function () {
this.polling = true;
this.timerLoop( true ); // Will not sync immediately, because timeoutId should be null
};
/**
* Loop once with `setTimeout`
*
* @param {boolean} firstTime Wait before polling
*/
ve.ce.SurfaceObserver.prototype.timerLoop = function ( firstTime ) {
Iif ( this.timeoutId ) {
// In case we're not running from setTimeout
clearTimeout( this.timeoutId );
this.timeoutId = null;
}
Iif ( !firstTime ) {
this.pollOnce();
}
// Only reach this point if pollOnce does not throw an exception
if ( this.pollInterval !== null ) {
this.timeoutId = this.setTimeout(
this.timerLoop.bind( this ),
this.pollInterval
);
}
};
/**
* Stop polling
*/
ve.ce.SurfaceObserver.prototype.stopTimerLoop = function () {
if ( this.polling === true ) {
this.polling = false;
clearTimeout( this.timeoutId );
this.timeoutId = null;
}
};
/**
* Disable the surface observer
*/
ve.ce.SurfaceObserver.prototype.disable = function () {
this.disabled = true;
};
/**
* Enable the surface observer
*/
ve.ce.SurfaceObserver.prototype.enable = function () {
this.disabled = false;
};
/**
* Poll for changes.
*/
ve.ce.SurfaceObserver.prototype.pollOnce = function () {
this.pollOnceInternal( true );
};
/**
* Poll to update SurfaceObserver, but don't signal any changes back to the Surface
*/
ve.ce.SurfaceObserver.prototype.pollOnceNoCallback = function () {
this.pollOnceInternal( false );
};
/**
* Poll to update SurfaceObserver, but only check for selection changes
*
* Used as an optimisation when you know the content hasn't changed
*/
ve.ce.SurfaceObserver.prototype.pollOnceSelection = function () {
this.pollOnceInternal( true, true );
};
/**
* Poll for changes.
*
* @private
* @param {boolean} signalChanges If there changes are observed, call Surface#handleObservedChange
* @param {boolean} selectionOnly Check for selection changes only
*/
ve.ce.SurfaceObserver.prototype.pollOnceInternal = function ( signalChanges, selectionOnly ) {
if ( !this.domDocument || this.disabled ) {
return;
}
const oldState = this.rangeState;
const newState = new ve.ce.RangeState(
oldState,
this.surface.attachedRoot,
selectionOnly
);
this.rangeState = newState;
if ( signalChanges && (
newState.contentChanged ||
newState.branchNodeChanged ||
newState.selectionChanged
) ) {
this.surface.handleObservedChanges( oldState, newState );
}
};
/**
* Wrapper for setTimeout, for ease of debugging
*
* @param {Function} callback
* @param {number} timeout Timeout ms
* @return {number} Timeout ID
*/
ve.ce.SurfaceObserver.prototype.setTimeout = function ( callback, timeout ) {
return setTimeout( callback, timeout );
};
/**
* Get the range last observed.
*
* Used when you have just polled, but don't want to wait for a 'rangeChange' event.
*
* @return {ve.Range|null}
*/
ve.ce.SurfaceObserver.prototype.getRange = function () {
Iif ( !this.rangeState ) {
return null;
}
return this.rangeState.veRange;
};
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