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| import {
flatten,
filter,
forEach,
groupBy,
map,
unionBy
} from 'min-dash';
import { saveClear } from '../../util/Removal';
import {
remove as collectionRemove
} from '../../util/Collections';
import { getNewAttachShapeDelta } from '../../util/AttachUtil';
import inherits from 'inherits';
var LOW_PRIORITY = 251,
HIGH_PRIORITY = 1401;
import CommandInterceptor from '../../command/CommandInterceptor';
/**
* Adds the notion of attached elements to the modeler.
*
* Optionally depends on `diagram-js/lib/features/move` to render
* the attached elements during move preview.
*
* Optionally depends on `diagram-js/lib/features/label-support`
* to render attached labels during move preview.
*
* @param {didi.Injector} injector
* @param {EventBus} eventBus
* @param {Rules} rules
* @param {Modeling} modeling
*/
export default function AttachSupport(injector, eventBus, rules, modeling) {
CommandInterceptor.call(this, eventBus);
var movePreview = injector.get('movePreview', false);
// remove all the attached elements from the shapes to be validated
// add all the attached shapes to the overall list of moved shapes
eventBus.on('shape.move.start', HIGH_PRIORITY, function(e) {
var context = e.context,
shapes = context.shapes,
validatedShapes = context.validatedShapes;
context.shapes = addAttached(shapes);
context.validatedShapes = removeAttached(validatedShapes);
});
// add attachers to the visual's group
movePreview && eventBus.on('shape.move.start', LOW_PRIORITY, function(e) {
var context = e.context,
shapes = context.shapes,
attachers = getAttachers(shapes);
forEach(attachers, function(attacher) {
movePreview.makeDraggable(context, attacher, true);
forEach(attacher.labels, function(label) {
movePreview.makeDraggable(context, label, true);
});
});
});
// add all attachers to move closure
this.preExecuted('elements.move', HIGH_PRIORITY, function(e) {
var context = e.context,
closure = context.closure,
shapes = context.shapes,
attachers = getAttachers(shapes);
forEach(attachers, function(attacher) {
closure.add(attacher, closure.topLevel[attacher.host.id]);
});
});
// perform the attaching after shapes are done moving
this.postExecuted('elements.move', function(e) {
var context = e.context,
shapes = context.shapes,
newHost = context.newHost,
attachers;
// we only support attachment / detachment of one element
if (shapes.length > 1) {
return;
}
if (newHost) {
attachers = shapes;
} else {
attachers = filter(shapes, function(s) {
return !!s.host;
});
}
forEach(attachers, function(attacher) {
modeling.updateAttachment(attacher, newHost);
});
});
// ensure invalid attachment connections are removed
this.postExecuted('elements.move', function(e) {
var shapes = e.context.shapes;
forEach(shapes, function(shape) {
forEach(shape.attachers, function(attacher) {
// remove invalid outgoing connections
forEach(attacher.outgoing.slice(), function(connection) {
var allowed = rules.allowed('connection.reconnectStart', {
connection: connection,
source: connection.source,
target: connection.target
});
if (!allowed) {
modeling.removeConnection(connection);
}
});
// remove invalid incoming connections
forEach(attacher.incoming.slice(), function(connection) {
var allowed = rules.allowed('connection.reconnectEnd', {
connection: connection,
source: connection.source,
target: connection.target
});
if (!allowed) {
modeling.removeConnection(connection);
}
});
});
});
});
this.postExecute('shape.create', function(e) {
var context = e.context,
shape = context.shape,
host = context.host;
if (host) {
modeling.updateAttachment(shape, host);
}
});
// update attachments if the host is replaced
this.postExecute('shape.replace', function(e) {
var context = e.context,
oldShape = context.oldShape,
newShape = context.newShape;
// move the attachers to the new host
saveClear(oldShape.attachers, function(attacher) {
var allowed = rules.allowed('elements.move', {
target: newShape,
shapes: [attacher]
});
if (allowed === 'attach') {
modeling.updateAttachment(attacher, newShape);
} else {
modeling.removeShape(attacher);
}
});
// move attachers if new host has different size
if (newShape.attachers.length) {
forEach(newShape.attachers, function(attacher) {
var delta = getNewAttachShapeDelta(attacher, oldShape, newShape);
modeling.moveShape(attacher, delta, attacher.parent);
});
}
});
// move shape on host resize
this.postExecute('shape.resize', function(event) {
var context = event.context,
shape = context.shape,
oldBounds = context.oldBounds,
newBounds = context.newBounds,
attachers = shape.attachers;
forEach(attachers, function(attacher) {
var delta = getNewAttachShapeDelta(attacher, oldBounds, newBounds);
modeling.moveShape(attacher, delta, attacher.parent);
forEach(attacher.labels, function(label) {
modeling.moveShape(label, delta, label.parent);
});
});
});
// remove attachments
this.preExecute('shape.delete', function(event) {
var shape = event.context.shape;
saveClear(shape.attachers, function(attacher) {
modeling.removeShape(attacher);
});
if (shape.host) {
modeling.updateAttachment(shape, null);
}
});
// Prevent attachers and their labels from moving, when the space tool is performed.
// Otherwise the attachers and their labels would be moved twice.
eventBus.on('spaceTool.move', function(event) {
var context = event.context,
initialized = context.initialized,
attachSupportInitialized = context.attachSupportInitialized;
if (!initialized || attachSupportInitialized) {
return;
}
var movingShapes = context.movingShapes;
// collect attachers whose host is not being moved using the space tool
var staticAttachers = filter(movingShapes, function(shape) {
var host = shape.host;
return host && movingShapes.indexOf(host) === -1;
});
// remove attachers that are not going to be moved from moving shapes
forEach(staticAttachers, function(shape) {
collectionRemove(movingShapes, shape);
forEach(shape.labels, function(label) {
collectionRemove(movingShapes, shape.label);
});
});
context.attachSupportInitialized = true;
});
}
inherits(AttachSupport, CommandInterceptor);
AttachSupport.$inject = [
'injector',
'eventBus',
'rules',
'modeling'
];
/**
* Return attachers of the given shapes
*
* @param {Array<djs.model.Base>} shapes
* @return {Array<djs.model.Base>}
*/
function getAttachers(shapes) {
return flatten(map(shapes, function(s) {
return s.attachers || [];
}));
}
/**
* Return a combined list of elements and
* attachers.
*
* @param {Array<djs.model.Base>} elements
* @return {Array<djs.model.Base>} filtered
*/
function addAttached(elements) {
var attachers = getAttachers(elements);
return unionBy('id', elements, attachers);
}
/**
* Return a filtered list of elements that do not
* contain attached elements with hosts being part
* of the selection.
*
* @param {Array<djs.model.Base>} elements
*
* @return {Array<djs.model.Base>} filtered
*/
function removeAttached(elements) {
var ids = groupBy(elements, 'id');
return filter(elements, function(element) {
while (element) {
// host in selection
if (element.host && ids[element.host.id]) {
return false;
}
element = element.parent;
}
return true;
});
}
|