konva
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HTML5 2d canvas library for interactive graphics, design editors, whiteboards, and diagrams.
253 lines (252 loc) • 8.33 kB
JavaScript
import { Factory } from "../Factory.js";
import { Util } from "../Util.js";
import { Shape } from "../Shape.js";
import { Group } from "../Group.js";
import { getNumberOrArrayOfNumbersValidator, getNumberValidator, } from "../Validators.js";
import { _registerNode } from "../Global.js";
import { Text } from "./Text.js";
// constants
const ATTR_CHANGE_LIST = [
...Text.prototype._attrsAffectingSize,
'width',
'height',
'pointerDirection',
'pointerWidth',
'pointerHeight',
], CHANGE_EVENTS = ATTR_CHANGE_LIST.map((attr) => attr + 'Change.konva').join(' '), NONE = 'none', UP = 'up', RIGHT = 'right', DOWN = 'down', LEFT = 'left';
/**
* Label constructor. Labels are groups that contain a Text and Tag shape
* @constructor
* @memberof Konva
* @param {Object} config
* @@nodeParams
* @example
* // create label
* var label = new Konva.Label({
* x: 100,
* y: 100,
* draggable: true
* });
*
* // add a tag to the label
* label.add(new Konva.Tag({
* fill: '#bbb',
* stroke: '#333',
* shadowColor: 'black',
* shadowBlur: 10,
* shadowOffset: { x: 10, y: 10 },
* shadowOpacity: 0.2,
* lineJoin: 'round',
* pointerDirection: 'up',
* pointerWidth: 20,
* pointerHeight: 20,
* cornerRadius: 5
* }));
*
* // add text to the label
* label.add(new Konva.Text({
* text: 'Hello World!',
* fontSize: 50,
* lineHeight: 1.2,
* padding: 10,
* fill: 'green'
* }));
*/
export class Label extends Group {
constructor(config) {
super(config);
this._sync = this._sync.bind(this);
this.on('add.konva', function (evt) {
// re-adding the same child must not stack another listener
evt.child.off(CHANGE_EVENTS, this._sync).on(CHANGE_EVENTS, this._sync);
this._sync();
});
}
/**
* get Text shape for the label. You need to access the Text shape in order to update
* the text properties
* @name Konva.Label#getText
* @method
* @example
* label.getText().fill('red')
*/
getText() {
return this.find('Text')[0];
}
/**
* get Tag shape for the label. You need to access the Tag shape in order to update
* the pointer properties and the corner radius
* @name Konva.Label#getTag
* @method
*/
getTag() {
return this.find('Tag')[0];
}
getWidth() {
return this.getText().width();
}
getHeight() {
return this.getText().height();
}
_sync() {
let text = this.getText(), tag = this.getTag(), width, height, pointerDirection, pointerWidth, x, y, pointerHeight;
if (text && tag) {
width = text.width();
height = text.height();
pointerDirection = tag.pointerDirection();
pointerWidth = tag.pointerWidth();
pointerHeight = tag.pointerHeight();
x = 0;
y = 0;
switch (pointerDirection) {
case UP:
x = width / 2;
y = -1 * pointerHeight;
break;
case RIGHT:
x = width + pointerWidth;
y = height / 2;
break;
case DOWN:
x = width / 2;
y = height + pointerHeight;
break;
case LEFT:
x = -1 * pointerWidth;
y = height / 2;
break;
}
tag.setAttrs({
x: -1 * x,
y: -1 * y,
width: width,
height: height,
});
text.setAttrs({
x: -1 * x,
y: -1 * y,
});
}
}
}
Label.prototype.className = 'Label';
_registerNode(Label);
/**
* Tag constructor. A Tag can be configured
* to have a pointer element that points up, right, down, or left
* @constructor
* @memberof Konva
* @param {Object} config
* @param {String} [config.pointerDirection] can be up, right, down, left, or none; the default
* is none. When a pointer is present, the positioning of the label is relative to the tip of the pointer.
* @param {Number} [config.pointerWidth]
* @param {Number} [config.pointerHeight]
* @param {Number} [config.cornerRadius]
*/
export class Tag extends Shape {
_sceneFunc(context) {
const width = this.width(), height = this.height(), pointerDirection = this.pointerDirection(), pointerWidth = this.pointerWidth(), pointerHeight = this.pointerHeight(), cornerRadius = this.cornerRadius();
const [topLeft, topRight, bottomRight, bottomLeft] = Util._cornerRadii(cornerRadius, width, height);
context.beginPath();
context.moveTo(topLeft, 0);
if (pointerDirection === UP) {
context.lineTo((width - pointerWidth) / 2, 0);
context.lineTo(width / 2, -1 * pointerHeight);
context.lineTo((width + pointerWidth) / 2, 0);
}
context.lineTo(width - topRight, 0);
context.arc(width - topRight, topRight, topRight, (Math.PI * 3) / 2, 0, false);
if (pointerDirection === RIGHT) {
context.lineTo(width, (height - pointerHeight) / 2);
context.lineTo(width + pointerWidth, height / 2);
context.lineTo(width, (height + pointerHeight) / 2);
}
context.lineTo(width, height - bottomRight);
context.arc(width - bottomRight, height - bottomRight, bottomRight, 0, Math.PI / 2, false);
if (pointerDirection === DOWN) {
context.lineTo((width + pointerWidth) / 2, height);
context.lineTo(width / 2, height + pointerHeight);
context.lineTo((width - pointerWidth) / 2, height);
}
context.lineTo(bottomLeft, height);
context.arc(bottomLeft, height - bottomLeft, bottomLeft, Math.PI / 2, Math.PI, false);
if (pointerDirection === LEFT) {
context.lineTo(0, (height + pointerHeight) / 2);
context.lineTo(-1 * pointerWidth, height / 2);
context.lineTo(0, (height - pointerHeight) / 2);
}
context.lineTo(0, topLeft);
context.arc(topLeft, topLeft, topLeft, Math.PI, (Math.PI * 3) / 2, false);
context.closePath();
context.fillStrokeShape(this);
}
getSelfRect() {
let x = 0, y = 0, pointerWidth = this.pointerWidth(), pointerHeight = this.pointerHeight(), direction = this.pointerDirection(), width = this.width(), height = this.height();
if (direction === UP) {
y -= pointerHeight;
height += pointerHeight;
}
else if (direction === DOWN) {
height += pointerHeight;
}
else if (direction === LEFT) {
x -= pointerWidth;
width += pointerWidth;
}
else if (direction === RIGHT) {
width += pointerWidth;
}
return {
x: x,
y: y,
width: width,
height: height,
};
}
}
Tag.prototype.className = 'Tag';
_registerNode(Tag);
/**
* get/set pointer direction
* @name Konva.Tag#pointerDirection
* @method
* @param {String} pointerDirection can be up, right, down, left, or none. The default is none.
* @returns {String}
* @example
* tag.pointerDirection('right');
*/
Factory.addGetterSetter(Tag, 'pointerDirection', NONE);
/**
* get/set pointer width
* @name Konva.Tag#pointerWidth
* @method
* @param {Number} pointerWidth
* @returns {Number}
* @example
* tag.pointerWidth(20);
*/
Factory.addGetterSetter(Tag, 'pointerWidth', 0, getNumberValidator());
/**
* get/set pointer height
* @method
* @name Konva.Tag#pointerHeight
* @param {Number} pointerHeight
* @returns {Number}
* @example
* tag.pointerHeight(20);
*/
Factory.addGetterSetter(Tag, 'pointerHeight', 0, getNumberValidator());
/**
* get/set cornerRadius
* @name Konva.Tag#cornerRadius
* @method
* @param {Number} cornerRadius
* @returns {Number}
* @example
* tag.cornerRadius(20);
*
* // set different corner radius values
* // top-left, top-right, bottom-right, bottom-left
* tag.cornerRadius([0, 10, 20, 30]);
*/
Factory.addGetterSetter(Tag, 'cornerRadius', 0, getNumberOrArrayOfNumbersValidator(4));