"use strict"
/*
* Copyright (C) 1998-2017 by Northwoods Software Corporation. All Rights Reserved.
*/
// A custom Tool for shifting the end point of a Link to be anywhere along the edges of the port.
/**
* This constructor produces a tool for shifting the end of a link;
* use it in a diagram.toolManager.mouseDownTools list:
* <pre>myDiagram.toolManager.mouseDownTools.add(new LinkShiftingTool());</pre>
* @constructor
* @extends Tool
* @class
*/
function LinkShiftingTool() {
go.Tool.call(this);
this.name = "LinkShifting";
// these are archetypes for the two shift handles, one at each end of the Link:
var h = new go.Shape();
h.geometryString = "F1 M0 0 L8 0 M8 4 L0 4";
h.fill = null;
h.stroke = "dodgerblue";
h.background = "lightblue";
h.cursor = "pointer";
h.segmentIndex = 0;
h.segmentFraction = 1;
h.segmentOrientation = go.Link.OrientAlong;
/** @type {GraphObject} */
this._fromHandleArchetype = h;
h = new go.Shape();
h.geometryString = "F1 M0 0 L8 0 M8 4 L0 4";
h.fill = null;
h.stroke = "dodgerblue";
h.background = "lightblue";
h.cursor = "pointer";
h.segmentIndex = -1;
h.segmentFraction = 1;
h.segmentOrientation = go.Link.OrientAlong;
/** @type {GraphObject} */
this._toHandleArchetype = h;
// transient state
/** @type {GraphObject} */
this._handle = null;
/** @type {List} */
this._originalPoints = null;
}
go.Diagram.inherit(LinkShiftingTool, go.Tool);
/**
* @this {LinkShiftingTool}
* @param {Part} part
*/
LinkShiftingTool.prototype.updateAdornments = function(part) {
if (part === null || !(part instanceof go.Link)) return; // this tool only applies to Links
var link = part;
// show handles if link is selected, remove them if no longer selected
var category = "LinkShiftingFrom";
var adornment = null;
if (link.isSelected && !this.diagram.isReadOnly) {
var selelt = link.selectionObject;
if (selelt !== null && link.actualBounds.isReal() && link.isVisible() &&
selelt.actualBounds.isReal() && selelt.isVisibleObject()) {
var spot = link.computeSpot(true);
if (spot.isSide() || spot.isSpot()) {
adornment = link.findAdornment(category);
if (adornment === null) {
adornment = this.makeAdornment(selelt, false);
adornment.category = category;
link.addAdornment(category, adornment);
}
}
}
}
if (adornment === null) link.removeAdornment(category);
category = "LinkShiftingTo";
adornment = null;
if (link.isSelected && !this.diagram.isReadOnly) {
var selelt = link.selectionObject;
if (selelt !== null && link.actualBounds.isReal() && link.isVisible() &&
selelt.actualBounds.isReal() && selelt.isVisibleObject()) {
var spot = link.computeSpot(false);
if (spot.isSide() || spot.isSpot()) {
adornment = link.findAdornment(category);
if (adornment === null) {
adornment = this.makeAdornment(selelt, true);
adornment.category = category;
link.addAdornment(category, adornment);
}
}
}
}
if (adornment === null) link.removeAdornment(category);
};
/**
* @this {LinkShiftingTool}
* @param {GraphObject} selelt the {@link GraphObject} of the {@link Link} being shifted.
* @param {boolean} toend
* @return {Adornment}
*/
LinkShiftingTool.prototype.makeAdornment = function(selelt, toend) {
var adornment = new go.Adornment();
adornment.type = go.Panel.Link;
var h = (toend ? this._toHandleArchetype : this._fromHandleArchetype);
if (h !== null) {
// add a single handle for shifting at one end
adornment.add(h.copy());
}
adornment.adornedObject = selelt;
return adornment;
};
/**
* @this {LinkShiftingTool}
* @return {boolean}
*/
LinkShiftingTool.prototype.canStart = function() {
if (!this.isEnabled) return false;
var diagram = this.diagram;
if (diagram === null || diagram.isReadOnly || diagram.isModelReadOnly) return false;
if (!diagram.lastInput.left) return false;
var h = this.findToolHandleAt(diagram.firstInput.documentPoint, "LinkShiftingFrom");
if (h === null) h = this.findToolHandleAt(diagram.firstInput.documentPoint, "LinkShiftingTo");
return (h !== null);
}
/**
* @this {LinkShiftingTool}
*/
LinkShiftingTool.prototype.doActivate = function() {
var diagram = this.diagram;
if (diagram === null) return;
var h = this.findToolHandleAt(diagram.firstInput.documentPoint, "LinkShiftingFrom");
if (h === null) h = this.findToolHandleAt(diagram.firstInput.documentPoint, "LinkShiftingTo");
if (h === null) return;
var ad = h.part;
var link = ad.adornedObject.part;
if (!(link instanceof go.Link)) return;
this._handle = h;
this._originalPoints = link.points.copy();
this.startTransaction(this.name);
diagram.isMouseCaptured = true;
diagram.currentCursor = 'pointer';
this.isActive = true;
};
/**
* @this {LinkShiftingTool}
*/
LinkShiftingTool.prototype.doDeactivate = function() {
this.isActive = false;
var diagram = this.diagram;
if (diagram === null) return;
diagram.isMouseCaptured = false;
diagram.currentCursor = '';
this.stopTransaction();
};
/**
* Clean up tool state.
* @this {LinkShiftingTool}
*/
LinkShiftingTool.prototype.doStop = function() {
this._handle = null;
this._originalPoints = null;
};
/**
* Clean up tool state.
* @this {LinkShiftingTool}
*/
LinkShiftingTool.prototype.doCancel = function() {
var ad = this._handle.part;
var link = ad.adornedObject.part;
link.points = this._originalPoints;
this.stopTool();
};
/**
* @this {LinkShiftingTool}
*/
LinkShiftingTool.prototype.doMouseMove = function() {
if (this.isActive) {
this.doReshape(this.diagram.lastInput.documentPoint);
}
};
/**
* @this {LinkShiftingTool}
*/
LinkShiftingTool.prototype.doMouseUp = function() {
if (this.isActive) {
this.doReshape(this.diagram.lastInput.documentPoint);
this.transactionResult = this.name;
}
this.stopTool();
};
/**
* @this {LinkShiftingTool}
* @param {Point} pt
*/
LinkShiftingTool.prototype.doReshape = function(pt) {
var ad = this._handle.part;
var link = ad.adornedObject.part;
var fromend = ad.category === "LinkShiftingFrom";
var port = null;
if (fromend) {
port = link.fromPort;
} else {
port = link.toPort;
}
var portb = new go.Rect(port.getDocumentPoint(go.Spot.TopLeft),
port.getDocumentPoint(go.Spot.BottomRight));
// determine new connection point based on closest point to bounds of port property
var x = portb.width > 0 ? (pt.x - portb.x) / portb.width : 0;
var y = portb.height > 0 ? (pt.y - portb.y) / portb.height : 0;
var sx = undefined;
var sy = undefined;
if (x <= 0) {
sx = 0;
if (y <= 0) {
sy = 0;
} else if (y >= 1) {
sy = 1;
} else {
sy = y;
}
} else if (x >= 1) {
sx = 1;
if (y <= 0) {
sy = 0;
} else if (y >= 1) {
sy = 1;
} else {
sy = y;
}
} else {
if (y <= 0) {
sx = x;
sy = 0;
} else if (y >= 1) {
sx = x;
sy = 1;
} else { // in the middle
if (x > y) {
if (x > 1 - y) {
sx = 1; // right side
sy = y;
} else {
sx = x;
sy = 0; // top side
}
} else { // y <= x
if (x > 1 - y) {
sx = x;
sy = 1; // bottom side
} else {
sx = 0; // left side
sy = y;
}
}
}
}
if (sx !== undefined && sy !== undefined) {
if (fromend) {
link.fromSpot = new go.Spot(sx, sy);
} else {
link.toSpot = new go.Spot(sx, sy);
}
}
};
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