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| import {
pick,
assign
} from 'min-dash';
import {
resizeBounds,
ensureConstraints,
computeChildrenBBox,
getMinResizeBounds
} from './ResizeUtil';
import {
asTRBL,
roundBounds
} from '../../layout/LayoutUtil';
var DEFAULT_MIN_WIDTH = 10;
/**
* A component that provides resizing of shapes on the canvas.
*
* The following components are part of shape resize:
*
* * adding resize handles,
* * creating a visual during resize
* * checking resize rules
* * committing a change once finished
*
*
* ## Customizing
*
* It's possible to customize the resizing behaviour by intercepting 'resize.start'
* and providing the following parameters through the 'context':
*
* * minDimensions ({ width, height }): minimum shape dimensions
*
* * childrenBoxPadding ({ left, top, bottom, right } || number):
* gap between the minimum bounding box and the container
*
* f.ex:
*
* ```javascript
* eventBus.on('resize.start', 1500, function(event) {
* var context = event.context,
*
* context.minDimensions = { width: 140, height: 120 };
*
* // Passing general padding
* context.childrenBoxPadding = 30;
*
* // Passing padding to a specific side
* context.childrenBoxPadding.left = 20;
* });
* ```
*/
export default function Resize(eventBus, rules, modeling, dragging) {
this._dragging = dragging;
this._rules = rules;
var self = this;
/**
* Handle resize move by specified delta.
*
* @param {Object} context
* @param {Point delta
*/
function handleMove(context, delta) {
var shape = context.shape,
direction = context.direction,
resizeConstraints = context.resizeConstraints,
newBounds;
context.delta = delta;
newBounds = resizeBounds(shape, direction, delta);
// ensure constraints during resize
context.newBounds = ensureConstraints(newBounds, resizeConstraints);
// update + cache executable state
context.canExecute = self.canResize(context);
}
/**
* Handle resize start.
*
* @param {Object} context
*/
function handleStart(context) {
var resizeConstraints = context.resizeConstraints,
// evaluate minBounds for backwards compatibility
minBounds = context.minBounds;
Iif (resizeConstraints !== undefined) {
return;
}
if (minBounds === undefined) {
minBounds = self.computeMinResizeBox(context);
}
context.resizeConstraints = {
min: asTRBL(minBounds)
};
}
/**
* Handle resize end.
*
* @param {Object} context
*/
function handleEnd(context) {
var shape = context.shape,
canExecute = context.canExecute,
newBounds = context.newBounds;
if (canExecute) {
// ensure we have actual pixel values for new bounds
// (important when zoom level was > 1 during move)
newBounds = roundBounds(newBounds);
// perform the actual resize
modeling.resizeShape(shape, newBounds);
}
}
eventBus.on('resize.start', function(event) {
handleStart(event.context);
});
eventBus.on('resize.move', function(event) {
var delta = {
x: event.dx,
y: event.dy
};
handleMove(event.context, delta);
});
eventBus.on('resize.end', function(event) {
handleEnd(event.context);
});
}
Resize.prototype.canResize = function(context) {
var rules = this._rules;
var ctx = pick(context, [ 'newBounds', 'shape', 'delta', 'direction' ]);
return rules.allowed('shape.resize', ctx);
};
/**
* Activate a resize operation.
*
* You may specify additional contextual information and must specify a
* resize direction during activation of the resize event.
*
* @param {MouseEvent} event
* @param {djs.model.Shape} shape
* @param {Object|String} contextOrDirection
*/
Resize.prototype.activate = function(event, shape, contextOrDirection) {
var dragging = this._dragging,
context,
direction;
if (typeof contextOrDirection === 'string') {
contextOrDirection = {
direction: contextOrDirection
};
}
context = assign({ shape: shape }, contextOrDirection);
direction = context.direction;
Iif (!direction) {
throw new Error('must provide a direction (nw|se|ne|sw)');
}
dragging.init(event, 'resize', {
autoActivate: true,
cursor: 'resize-' + (/nw|se/.test(direction) ? 'nwse' : 'nesw'),
data: {
shape: shape,
context: context
}
});
};
Resize.prototype.computeMinResizeBox = function(context) {
var shape = context.shape,
direction = context.direction,
minDimensions,
childrenBounds;
minDimensions = context.minDimensions || {
width: DEFAULT_MIN_WIDTH,
height: DEFAULT_MIN_WIDTH
};
// get children bounds
childrenBounds = computeChildrenBBox(shape, context.childrenBoxPadding);
// get correct minimum bounds from given resize direction
// basically ensures that the minBounds is max(childrenBounds, minDimensions)
return getMinResizeBounds(direction, shape, minDimensions, childrenBounds);
};
Resize.$inject = [
'eventBus',
'rules',
'modeling',
'dragging'
]; |