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| import {
bind,
debounce,
forEach,
isNumber,
isObject
} from 'min-dash';
import {
isSnapped,
setSnapped
} from './SnapUtil';
import {
append as svgAppend,
attr as svgAttr,
classes as svgClasses,
create as svgCreate
} from 'tiny-svg';
var SNAP_TOLERANCE = 7;
export var SNAP_LINE_HIDE_DELAY = 1000;
/**
* Generic snapping feature.
*
* @param {EventBus} eventBus
* @param {Canvas} canvas
*/
export default function Snapping(canvas) {
this._canvas = canvas;
// delay hide by 1000 seconds since last snap
this._asyncHide = debounce(bind(this.hide, this), SNAP_LINE_HIDE_DELAY);
}
Snapping.$inject = [ 'canvas' ];
/**
* Snap an event to given snap points.
*
* @param {Event} event
* @param {SnapPoints} snapPoints
*/
Snapping.prototype.snap = function(event, snapPoints) {
var context = event.context,
snapContext = context.snapContext,
snapLocations = snapContext.getSnapLocations();
var snapping = {
x: isSnapped(event, 'x'),
y: isSnapped(event, 'y')
};
forEach(snapLocations, function(location) {
var snapOrigin = snapContext.getSnapOrigin(location);
var snapCurrent = {
x: event.x + snapOrigin.x,
y: event.y + snapOrigin.y
};
// snap both axis if not snapped already
forEach([ 'x', 'y' ], function(axis) {
var locationSnapping;
if (!snapping[axis]) {
locationSnapping = snapPoints.snap(snapCurrent, location, axis, SNAP_TOLERANCE);
if (locationSnapping !== undefined) {
snapping[axis] = {
value: locationSnapping,
originValue: locationSnapping - snapOrigin[axis]
};
}
}
});
// no need to continue snapping
if (snapping.x && snapping.y) {
return false;
}
});
// show snap lines
this.showSnapLine('vertical', snapping.x && snapping.x.value);
this.showSnapLine('horizontal', snapping.y && snapping.y.value);
// snap event
forEach([ 'x', 'y' ], function(axis) {
var axisSnapping = snapping[axis];
if (isObject(axisSnapping)) {
setSnapped(event, axis, axisSnapping.originValue);
}
});
};
Snapping.prototype._createLine = function(orientation) {
var root = this._canvas.getLayer('snap');
var line = svgCreate('path');
svgAttr(line, { d: 'M0,0 L0,0' });
svgClasses(line).add('djs-snap-line');
svgAppend(root, line);
return {
update: function(position) {
if (!isNumber(position)) {
svgAttr(line, { display: 'none' });
} else {
if (orientation === 'horizontal') {
svgAttr(line, {
d: 'M-100000,' + position + ' L+100000,' + position,
display: ''
});
} else {
svgAttr(line, {
d: 'M ' + position + ',-100000 L ' + position + ', +100000',
display: ''
});
}
}
}
};
};
Snapping.prototype._createSnapLines = function() {
this._snapLines = {
horizontal: this._createLine('horizontal'),
vertical: this._createLine('vertical')
};
};
Snapping.prototype.showSnapLine = function(orientation, position) {
var line = this.getSnapLine(orientation);
Eif (line) {
line.update(position);
}
this._asyncHide();
};
Snapping.prototype.getSnapLine = function(orientation) {
if (!this._snapLines) {
this._createSnapLines();
}
return this._snapLines[orientation];
};
Snapping.prototype.hide = function() {
forEach(this._snapLines, function(snapLine) {
snapLine.update();
});
};
|