mediawiki-extensions-Visual.../modules/ve/dm/ve.dm.Surface.js

158 lines
4 KiB
JavaScript

/**
* Creates an ve.dm.Surface object.
*
* @class
* @constructor
* @extends {ve.EventEmitter}
* @param {ve.dm.DocumentNode} doc Document model to create surface for
*/
ve.dm.Surface = function( doc ) {
// Inheritance
ve.EventEmitter.call( this );
// Properties
this.doc = doc;
this.selection = null;
this.smallStack = [];
this.bigStack = [];
this.undoIndex = 0;
var _this = this;
setInterval( function () {
_this.breakpoint();
}, 750 );
};
/* Methods */
ve.dm.Surface.prototype.purgeHistory = function() {
this.selection = null;
this.smallStack = [];
this.bigStack = [];
this.undoIndex = 0;
};
ve.dm.Surface.prototype.getHistory = function() {
if ( this.smallStack.length > 0 ) {
return this.bigStack.slice( 0 ).concat( [{ 'stack': this.smallStack.slice(0) }] );
} else {
return this.bigStack.slice( 0 );
}
};
/**
* Gets the document model of the surface.
*
* @method
* @returns {ve.dm.DocumentNode} Document model of the surface
*/
ve.dm.Surface.prototype.getDocument = function() {
return this.doc;
};
/**
* Gets the selection
*
* @method
* @returns {ve.Range} Current selection
*/
ve.dm.Surface.prototype.getSelection = function() {
return this.selection;
};
/**
* Changes the selection.
*
* If changing the selection at a high frequency (such as while dragging) use the combine argument
* to avoid them being split up into multiple history items
*
* @method
* @param {ve.Range} selection
* @param {Boolean} isManual Whether this selection was the result of a user action, and thus should
* be recorded in history...?
*/
ve.dm.Surface.prototype.select = function( selection, isManual ) {
selection.normalize();
/*if (
( ! this.selection ) || ( ! this.selection.equals( selection ) )
) {*/
if ( isManual ) {
this.breakpoint();
}
// check if the last thing is a selection, if so, swap it.
this.selection = selection;
this.emit( 'select', this.selection.clone() );
//}
};
/**
* Applies a series of transactions to the content data.
*
* If committing multiple transactions which are the result of a single user action and need to be
* part of a single history item, use the isPartial argument for all but the last one to avoid them
* being split up into multple history items.
*
* @method
* @param {ve.dm.Transaction} transactions Tranasction to apply to the document
* @param {boolean} isPartial whether this transaction is part of a larger logical grouping of
* transactions (such as when replacing - delete, then insert)
*/
ve.dm.Surface.prototype.transact = function( transaction ) {
this.bigStack = this.bigStack.slice( 0, this.bigStack.length - this.undoIndex );
this.undoIndex = 0;
this.smallStack.push( transaction );
this.doc.commit( transaction );
this.emit( 'transact', transaction );
};
ve.dm.Surface.prototype.breakpoint = function( selection ) {
if( this.smallStack.length > 0 ) {
this.bigStack.push( {
stack: this.smallStack,
selection: selection || this.selection.clone()
} );
this.smallStack = [];
}};
ve.dm.Surface.prototype.undo = function() {
this.breakpoint();
this.undoIndex++;
if ( this.bigStack[this.bigStack.length - this.undoIndex] ) {
var diff = 0;
var item = this.bigStack[this.bigStack.length - this.undoIndex];
for( var i = item.stack.length - 1; i >= 0; i-- ) {
this.doc.rollback( item.stack[i] );
diff += item.stack[i].lengthDifference;
}
var selection = item.selection;
selection.from -= diff;
selection.to -= diff;
this.select( selection );
}
};
ve.dm.Surface.prototype.redo = function() {
this.breakpoint();
if ( this.undoIndex > 0 ) {
if ( this.bigStack[this.bigStack.length - this.undoIndex] ) {
var diff = 0;
var item = this.bigStack[this.bigStack.length - this.undoIndex];
for( var i = 0; i < item.stack.length; i++ ) {
this.doc.commit( item.stack[i] );
diff += item.stack[i].lengthDifference;
}
var selection = item.selection;
selection.from += diff;
selection.to += diff;
this.selection = null;
this.select( selection );
}
this.undoIndex--;
}
};
/* Inheritance */
ve.extendClass( ve.dm.Surface, ve.EventEmitter );