81 lines
1.9 KiB
JavaScript
81 lines
1.9 KiB
JavaScript
'use strict';
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var getChildLanes = require('../util/LaneUtil').getChildLanes;
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var LANE_INDENTATION = require('../util/LaneUtil').LANE_INDENTATION;
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/**
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* A handler that splits a lane into a number of sub-lanes,
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* creating new sub lanes, if neccessary.
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*
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* @param {Modeling} modeling
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*/
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function SplitLaneHandler(modeling) {
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this._modeling = modeling;
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}
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SplitLaneHandler.$inject = [ 'modeling' ];
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module.exports = SplitLaneHandler;
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SplitLaneHandler.prototype.preExecute = function(context) {
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var modeling = this._modeling;
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var shape = context.shape,
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newLanesCount = context.count;
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var childLanes = getChildLanes(shape),
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existingLanesCount = childLanes.length;
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if (existingLanesCount > newLanesCount) {
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throw new Error('more than ' + newLanesCount + ' child lanes');
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}
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var newLanesHeight = Math.round(shape.height / newLanesCount);
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// Iterate from top to bottom in child lane order,
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// resizing existing lanes and creating new ones
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// so that they split the parent proportionally.
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//
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// Due to rounding related errors, the bottom lane
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// needs to take up all the remaining space.
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var laneY,
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laneHeight,
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laneBounds,
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newLaneAttrs,
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idx;
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for (idx = 0; idx < newLanesCount; idx++) {
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laneY = shape.y + idx * newLanesHeight;
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// if bottom lane
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if (idx === newLanesCount - 1) {
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laneHeight = shape.height - (newLanesHeight * idx);
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} else {
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laneHeight = newLanesHeight;
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}
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laneBounds = {
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x: shape.x + LANE_INDENTATION,
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y: laneY,
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width: shape.width - LANE_INDENTATION,
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height: laneHeight
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};
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if (idx < existingLanesCount) {
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// resize existing lane
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modeling.resizeShape(childLanes[idx], laneBounds);
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} else {
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// create a new lane at position
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newLaneAttrs = {
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type: 'bpmn:Lane'
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};
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modeling.createShape(newLaneAttrs, laneBounds, shape);
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}
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}
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};
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