source: main/trunk/greenstone3/web/interfaces/default/js/map-scripts-editor-history.js

function MapEditorHistory(mapEditor) {
    this.prevOverlays = [];
    this.presentOverlays = [];
    this.undoneOverlays = [];
    this.cycleCompvare = true;
    this.mapEditor = mapEditor;
}

MapEditorHistory.prototype.undo = function () {
    
    
    if (this.prevOverlays.length != 0) {
        for (var i = 0; i < this.mapEditor.overlays.length; i++) {
            this.mapEditor.overlays[i].setMap(null);
        }
        
        this.mapEditor.selectedShapes = [];
        this.mapEditor.overlays = [];
        this.undoneOverlaysPush();
        var prev_overlay = this.prevOverlays.pop();
        var draggableCB = document.getElementById("draggableCB" + "-" + this.mapEditor.id).checked = false;

        if (prev_overlay.length > 0) {
            for (var i = 0; i < prev_overlay.length; i++) {
                this.mapEditor.overlays[i] = prev_overlay[i];
                this.mapEditor.overlays[i].setMap(this.mapEditor.map);
                this.mapEditor.overlays[i].draggable = true;
            }
        }
    }
};

MapEditorHistory.prototype.redo = function () {

    if (this.undoneOverlays.length != 0) {
        if (this.undoneOverlays[this.undoneOverlays.length -1].length != 0) {
            this.mapEditor.selectedShapes = [];
            var draggableCB = document.getElementById("draggableCB" + "-" + this.mapEditor.id).checked = false;
            
            for (var i = 0; i < this.mapEditor.overlays.length; i++) {
                this.mapEditor.overlays[i].setMap(null);
            }

            this.mapEditor.overlays = [];
            var lastEntry = this.undoneOverlays[this.undoneOverlays.length - 1];
            for (var i = 0; i < lastEntry.length; i++) {
                this.mapEditor.overlays[i] = lastEntry[i];
                this.mapEditor.overlays[i].setMap(this.mapEditor.map);
                this.mapEditor.overlays[i].draggable = true;
            }

            var conditionPrevious = this.presentOverlays[0];
            if (conditionPrevious !== undefined) {
                if (conditionPrevious.length == 0) {
                    this.prevOverlays.push(this.presentOverlays[0]);
                } else {
                    var overlays_copy = [];
                    for (var i = 0; i < this.presentOverlays[0].length; i++) {
                        var clone_shape = ShapesUtil.cloneShape(this.presentOverlays[0][i]);
                        if (ShapesUtil.overlayItemIsShape(clone_shape)) {
                            this.mapEditor.addShapeListeners(clone_shape, null);
                        } else {
                            this.mapEditor.addMarkerListeners(clone_shape, null);
                        }
                        overlays_copy[i] = clone_shape;
                    }
                    this.prevOverlays.push(overlays_copy);
                }
            }
            this.presentOverlays = [];
            this.presentOverlays.push(this.undoneOverlays[this.undoneOverlays.length - 1]);
            this.undoneOverlays.pop();
        }
    }
}

MapEditorHistory.prototype.historyOverlayPush = function () {
    
    
    if (this.cycleCompvare) {
        
        var overlays_copy = [];
        for (var i = 0; i < this.mapEditor.overlays.length; i++) {
            var clone_shape = ShapesUtil.cloneShape(this.mapEditor.overlays[i]);
            if (ShapesUtil.overlayItemIsShape(clone_shape)) {
                this.mapEditor.addShapeListeners(clone_shape, null); // don't have an overlay event!
            } else {
                this.mapEditor.addMarkerListeners(clone_shape, null); // don't have an overlay event!
            }
            overlays_copy[i] = clone_shape;
        }
        this.undoneOverlays = [];
        this.prevOverlays.push(overlays_copy);
    }

    this.cycleCompvare = false;
}

MapEditorHistory.prototype.presentOverlayPush = function () {
//  console.log("presentOverlayPush");
    
    this.presentOverlays = [];
    var overlays_copy = [];
    for (var i = 0; i < this.mapEditor.overlays.length; i++) {
        var clone_shape = ShapesUtil.cloneShape(this.mapEditor.overlays[i]);
        if (ShapesUtil.overlayItemIsShape(clone_shape)) {
            this.mapEditor.addShapeListeners(clone_shape, null); // don't have an overlay event!
        } else {
            this.mapEditor.addMarkerListeners(clone_shape, null); // don't have an overlay event!
        }
        overlays_copy[i] = clone_shape;
    }
    this.presentOverlays.push(overlays_copy);
    this.cycleCompvare = true;

    
}

MapEditorHistory.prototype.undoneOverlaysPush = function () {
    
    var conditionUndone = this.presentOverlays[this.presentOverlays.length - 1] !== undefined;

    if (conditionUndone) {
        var overlays_copy = [];
        for (var i = 0; i < this.presentOverlays[0].length; i++) {
            var clone_shape = ShapesUtil.cloneShape(this.presentOverlays[0][i]);
            if (ShapesUtil.overlayItemIsShape(clone_shape)) {
                this.mapEditor.addShapeListeners(clone_shape, null); // don't have an overlay event!
            } else {
                this.mapEditor.addMarkerListeners(clone_shape, null); // don't have an overlay event!
            }
            overlays_copy[i] = clone_shape;
        }
        this.undoneOverlays.push(overlays_copy);
    }

    var conditionPresent = this.prevOverlays[this.prevOverlays.length - 1] !== undefined;

    if (conditionPresent) {
        this.presentOverlays = [];
        var overlays_copy = [];
        for (var i = 0; i < this.prevOverlays[this.prevOverlays.length - 1].length; i++) {
            var clone_shape = cloneShape(this.prevOverlays[this.prevOverlays.length - 1][i]);
            if (ShapesUtil.overlayItemIsShape(clone_shape)) {
                this.mapEditor.addShapeListeners(clone_shape, null); // don't have an overlay event!
            } else {
                this.mapEditor.addMarkerListeners(clone_shape, null); // don't have an overlay event!
            }
            overlays_copy[i] = clone_shape;
        }
        this.presentOverlays.push(overlays_copy);
    }
}

MapEditorHistory.prototype.undoneOverlaysPush = function () {

    var conditionUndone = this.presentOverlays[this.presentOverlays.length - 1] !== undefined;

    if (conditionUndone) {
        var overlays_copy = [];
        for (var i = 0; i < this.presentOverlays[0].length; i++) {
            var clone_shape = ShapesUtil.cloneShape(this.presentOverlays[0][i]);
            if (ShapesUtil.overlayItemIsShape(clone_shape)) {
                this.mapEditor.addShapeListeners(clone_shape, null); // don't have an overlay event!
            } else {
                this.mapEditor.addMarkerListeners(clone_shape, null); // don't have an overlay event!
            }
            overlays_copy[i] = clone_shape;
        }
        this.undoneOverlays.push(overlays_copy);
    }

    var conditionPresent = this.prevOverlays[this.prevOverlays.length - 1] !== undefined;

    if (conditionPresent) {
        this.presentOverlays = [];
        var overlays_copy = [];
        for (var i = 0; i < this.prevOverlays[this.prevOverlays.length - 1].length; i++) {
            var clone_shape = ShapesUtil.cloneShape(this.prevOverlays[this.prevOverlays.length - 1][i]);
            if (ShapesUtil.overlayItemIsShape(clone_shape)) {
                this.mapEditor.addShapeListeners(clone_shape, null); // don't have an overlay event!
            } else {
                this.mapEditor.addMarkerListeners(clone_shape, null); // don't have an overlay event!
            }
            overlays_copy[i] = clone_shape;
        }
        this.presentOverlays.push(overlays_copy);
    }
}