/*eslint-disable max-depth */
(function() {
'use strict';
// var isFirefox = navigator.userAgent.toLowerCase().indexOf('firefox') > -1;
// constants
var AUTO = 'auto',
//CANVAS = 'canvas',
CENTER = 'center',
JUSTIFY = 'justify',
CHANGE_KONVA = 'Change.konva',
CONTEXT_2D = '2d',
DASH = '-',
EMPTY_STRING = '',
LEFT = 'left',
TEXT = 'text',
TEXT_UPPER = 'Text',
MIDDLE = 'middle',
NORMAL = 'normal',
PX_SPACE = 'px ',
SPACE = ' ',
RIGHT = 'right',
WORD = 'word',
CHAR = 'char',
NONE = 'none',
ELLIPSIS = '…',
ATTR_CHANGE_LIST = [
'fontFamily',
'fontSize',
'fontStyle',
'fontVariant',
'padding',
'align',
'lineHeight',
'text',
'width',
'height',
'wrap',
'ellipsis',
'letterSpacing'
],
// cached variables
attrChangeListLen = ATTR_CHANGE_LIST.length;
var dummyContext;
function getDummyContext() {
if (dummyContext) {
return dummyContext;
}
dummyContext = Konva.Util.createCanvasElement().getContext(CONTEXT_2D);
return dummyContext;
}
/**
* Text constructor
* @constructor
* @memberof Konva
* @augments Konva.Shape
* @param {Object} config
* @param {String} [config.fontFamily] default is Arial
* @param {Number} [config.fontSize] in pixels. Default is 12
* @param {String} [config.fontStyle] can be normal, bold, or italic. Default is normal
* @param {String} [config.fontVariant] can be normal or small-caps. Default is normal
* @param {String} config.text
* @param {String} [config.align] can be left, center, or right
* @param {Number} [config.padding]
* @param {Number} [config.lineHeight] default is 1
* @param {String} [config.wrap] can be word, char, or none. Default is word
* @param {Boolean} [config.ellipsis] can be true or false. Default is false. if Konva.Text config is set to wrap="none" and ellipsis=true, then it will add "..." to the end
* @@shapeParams
* @@nodeParams
* @example
* var text = new Konva.Text({
* x: 10,
* y: 15,
* text: 'Simple Text',
* fontSize: 30,
* fontFamily: 'Calibri',
* fill: 'green'
* });
*/
Konva.Text = function(config) {
this.___init(config);
};
function _fillFunc(context) {
context.fillText(this.partialText, 0, 0);
}
function _strokeFunc(context) {
context.strokeText(this.partialText, 0, 0);
}
Konva.Text.prototype = {
___init: function(config) {
config = config || {};
// set default color to black
if (
!config.fillLinearGradientColorStops &&
!config.fillRadialGradientColorStops
) {
config.fill = config.fill || 'black';
}
//
// if (config.width === undefined) {
// config.width = AUTO;
// }
// if (config.height === undefined) {
// config.height = AUTO;
// }
// call super constructor
Konva.Shape.call(this, config);
this._fillFunc = _fillFunc;
this._strokeFunc = _strokeFunc;
this.className = TEXT_UPPER;
// update text data for certain attr changes
for (var n = 0; n < attrChangeListLen; n++) {
this.on(ATTR_CHANGE_LIST[n] + CHANGE_KONVA, this._setTextData);
}
this._setTextData();
this.sceneFunc(this._sceneFunc);
this.hitFunc(this._hitFunc);
},
_sceneFunc: function(context) {
var padding = this.getPadding(),
textHeight = this.getTextHeight(),
lineHeightPx = this.getLineHeight() * textHeight,
textArr = this.textArr,
textArrLen = textArr.length,
align = this.getAlign(),
totalWidth = this.getWidth(),
letterSpacing = this.getLetterSpacing(),
textDecoration = this.textDecoration(),
fill = this.fill(),
fontSize = this.fontSize(),
n;
context.setAttr('font', this._getContextFont());
context.setAttr('textBaseline', MIDDLE);
context.setAttr('textAlign', LEFT);
if (padding) {
context.translate(padding, 0);
context.translate(0, padding + lineHeightPx / 2);
} else {
context.translate(0, lineHeightPx / 2);
}
// draw text lines
for (n = 0; n < textArrLen; n++) {
var obj = textArr[n],
text = obj.text,
width = obj.width,
lastLine = n !== textArrLen - 1,
spacesNumber,
oneWord,
lineWidth;
// horizontal alignment
context.save();
if (align === RIGHT) {
context.translate(totalWidth - width - padding * 2, 0);
} else if (align === CENTER) {
context.translate((totalWidth - width - padding * 2) / 2, 0);
}
if (textDecoration.indexOf('underline') !== -1) {
context.save();
context.beginPath();
context.moveTo(0, Math.round(lineHeightPx / 2));
spacesNumber = text.split(' ').length - 1;
oneWord = spacesNumber === 0;
lineWidth =
align === JUSTIFY && lastLine && !oneWord
? totalWidth - padding * 2
: width;
context.lineTo(Math.round(lineWidth), Math.round(lineHeightPx / 2));
// TODO: I have no idea what is real ratio
// just /15 looks good enough
context.lineWidth = fontSize / 15;
context.strokeStyle = fill;
context.stroke();
context.restore();
}
if (textDecoration.indexOf('line-through') !== -1) {
context.save();
context.beginPath();
context.moveTo(0, 0);
spacesNumber = text.split(' ').length - 1;
oneWord = spacesNumber === 0;
lineWidth =
align === JUSTIFY && lastLine && !oneWord
? totalWidth - padding * 2
: width;
context.lineTo(Math.round(lineWidth), 0);
context.lineWidth = fontSize / 15;
context.strokeStyle = fill;
context.stroke();
context.restore();
}
if (letterSpacing !== 0 || align === JUSTIFY) {
// var words = text.split(' ');
spacesNumber = text.split(' ').length - 1;
for (var li = 0; li < text.length; li++) {
var letter = text[li];
// skip justify for the last line
if (letter === ' ' && n !== textArrLen - 1 && align === JUSTIFY) {
context.translate(
Math.floor((totalWidth - padding * 2 - width) / spacesNumber),
0
);
}
this.partialText = letter;
context.fillStrokeShape(this);
context.translate(
Math.round(this._getTextSize(letter).width) + letterSpacing,
0
);
}
} else {
this.partialText = text;
context.fillStrokeShape(this);
}
context.restore();
if (textArrLen > 1) {
context.translate(0, lineHeightPx);
}
}
},
_hitFunc: function(context) {
var width = this.getWidth(),
height = this.getHeight();
context.beginPath();
context.rect(0, 0, width, height);
context.closePath();
context.fillStrokeShape(this);
},
setText: function(text) {
var str = Konva.Util._isString(text) ? text : (text || '').toString();
this._setAttr(TEXT, str);
return this;
},
/**
* get width of text area, which includes padding
* @method
* @memberof Konva.Text.prototype
* @returns {Number}
*/
getWidth: function() {
var isAuto = this.attrs.width === AUTO || this.attrs.width === undefined;
return isAuto
? this.getTextWidth() + this.getPadding() * 2
: this.attrs.width;
},
/**
* get the height of the text area, which takes into account multi-line text, line heights, and padding
* @method
* @memberof Konva.Text.prototype
* @returns {Number}
*/
getHeight: function() {
var isAuto =
this.attrs.height === AUTO || this.attrs.height === undefined;
return isAuto
? this.getTextHeight() * this.textArr.length * this.getLineHeight() +
this.getPadding() * 2
: this.attrs.height;
},
/**
* get text width
* @method
* @memberof Konva.Text.prototype
* @returns {Number}
*/
getTextWidth: function() {
return this.textWidth;
},
/**
* get text height
* @method
* @memberof Konva.Text.prototype
* @returns {Number}
*/
getTextHeight: function() {
return this.textHeight;
},
_getTextSize: function(text) {
var _context = getDummyContext(),
fontSize = this.getFontSize(),
metrics;
_context.save();
_context.font = this._getContextFont();
metrics = _context.measureText(text);
_context.restore();
return {
width: metrics.width,
height: parseInt(fontSize, 10)
};
},
_getContextFont: function() {
// IE don't want to work with usual font style
// bold was not working
// removing font variant will solve
// fix for: https://github.com/konvajs/konva/issues/94
if (Konva.UA.isIE) {
return (
this.getFontStyle() +
SPACE +
this.getFontSize() +
PX_SPACE +
this.getFontFamily()
);
}
return (
this.getFontStyle() +
SPACE +
this.getFontVariant() +
SPACE +
this.getFontSize() +
PX_SPACE +
this.getFontFamily()
);
},
_addTextLine: function(line) {
if (this.align() === JUSTIFY) {
line = line.trim();
}
var width = this._getTextWidth(line);
return this.textArr.push({ text: line, width: width });
},
_getTextWidth: function(text) {
var latterSpacing = this.getLetterSpacing();
var length = text.length;
return (
getDummyContext().measureText(text).width +
(length ? latterSpacing * (length - 1) : 0)
);
},
_setTextData: function() {
var lines = this.getText().split('\n'),
fontSize = +this.getFontSize(),
textWidth = 0,
lineHeightPx = this.getLineHeight() * fontSize,
width = this.attrs.width,
height = this.attrs.height,
fixedWidth = width !== AUTO,
fixedHeight = height !== AUTO,
padding = this.getPadding(),
maxWidth = width - padding * 2,
maxHeightPx = height - padding * 2,
currentHeightPx = 0,
wrap = this.getWrap(),
shouldWrap = wrap !== NONE,
wrapAtWord = wrap !== CHAR && shouldWrap,
shouldAddEllipsis = this.getEllipsis() && !shouldWrap;
this.textArr = [];
getDummyContext().font = this._getContextFont();
for (var i = 0, max = lines.length; i < max; ++i) {
var line = lines[i];
var additionalWidth = shouldAddEllipsis
? this._getTextWidth(ELLIPSIS)
: 0;
var lineWidth = this._getTextWidth(line);
if (fixedWidth && lineWidth > maxWidth) {
/*
* if width is fixed and line does not fit entirely
* break the line into multiple fitting lines
*/
while (line.length > 0) {
/*
* use binary search to find the longest substring that
* that would fit in the specified width
*/
var low = 0,
high = line.length,
match = '',
matchWidth = 0;
while (low < high) {
var mid = (low + high) >>> 1,
substr = line.slice(0, mid + 1),
substrWidth = this._getTextWidth(substr) + additionalWidth;
if (substrWidth <= maxWidth) {
low = mid + 1;
match = substr + (shouldAddEllipsis ? ELLIPSIS : '');
matchWidth = substrWidth;
} else {
high = mid;
}
}
/*
* 'low' is now the index of the substring end
* 'match' is the substring
* 'matchWidth' is the substring width in px
*/
if (match) {
// a fitting substring was found
if (wrapAtWord) {
// try to find a space or dash where wrapping could be done
var wrapIndex;
var nextChar = line[match.length];
var nextIsSpaceOrDash = nextChar === SPACE || nextChar === DASH;
if (nextIsSpaceOrDash && matchWidth <= maxWidth) {
wrapIndex = match.length;
} else {
wrapIndex =
Math.max(
match.lastIndexOf(SPACE),
match.lastIndexOf(DASH)
) + 1;
}
if (wrapIndex > 0) {
// re-cut the substring found at the space/dash position
low = wrapIndex;
match = match.slice(0, low);
matchWidth = this._getTextWidth(match);
}
}
this._addTextLine(match);
textWidth = Math.max(textWidth, matchWidth);
currentHeightPx += lineHeightPx;
if (
!shouldWrap ||
(fixedHeight && currentHeightPx + lineHeightPx > maxHeightPx)
) {
/*
* stop wrapping if wrapping is disabled or if adding
* one more line would overflow the fixed height
*/
break;
}
line = line.slice(low);
if (line.length > 0) {
// Check if the remaining text would fit on one line
lineWidth = this._getTextWidth(line);
if (lineWidth <= maxWidth) {
// if it does, add the line and break out of the loop
this._addTextLine(line);
currentHeightPx += lineHeightPx;
textWidth = Math.max(textWidth, lineWidth);
break;
}
}
} else {
// not even one character could fit in the element, abort
break;
}
}
} else {
// element width is automatically adjusted to max line width
this._addTextLine(line);
currentHeightPx += lineHeightPx;
textWidth = Math.max(textWidth, lineWidth);
}
// if element height is fixed, abort if adding one more line would overflow
if (fixedHeight && currentHeightPx + lineHeightPx > maxHeightPx) {
break;
}
}
this.textHeight = fontSize;
// var maxTextWidth = 0;
// for(var j = 0; j < this.textArr.length; j++) {
// maxTextWidth = Math.max(maxTextWidth, this.textArr[j].width);
// }
this.textWidth = textWidth;
}
};
Konva.Util.extend(Konva.Text, Konva.Shape);
// add getters setters
Konva.Factory.addGetterSetter(Konva.Text, 'fontFamily', 'Arial');
/**
* get/set font family
* @name fontFamily
* @method
* @memberof Konva.Text.prototype
* @param {String} fontFamily
* @returns {String}
* @example
* // get font family
* var fontFamily = text.fontFamily();
*
* // set font family
* text.fontFamily('Arial');
*/
Konva.Factory.addGetterSetter(Konva.Text, 'fontSize', 12);
/**
* get/set font size in pixels
* @name fontSize
* @method
* @memberof Konva.Text.prototype
* @param {Number} fontSize
* @returns {Number}
* @example
* // get font size
* var fontSize = text.fontSize();
*
* // set font size to 22px
* text.fontSize(22);
*/
Konva.Factory.addGetterSetter(Konva.Text, 'fontStyle', NORMAL);
/**
* set font style. Can be 'normal', 'italic', or 'bold'. 'normal' is the default.
* @name fontStyle
* @method
* @memberof Konva.Text.prototype
* @param {String} fontStyle
* @returns {String}
* @example
* // get font style
* var fontStyle = text.fontStyle();
*
* // set font style
* text.fontStyle('bold');
*/
Konva.Factory.addGetterSetter(Konva.Text, 'fontVariant', NORMAL);
/**
* set font variant. Can be 'normal' or 'small-caps'. 'normal' is the default.
* @name fontVariant
* @method
* @memberof Konva.Text.prototype
* @param {String} fontVariant
* @returns {String}
* @example
* // get font variant
* var fontVariant = text.fontVariant();
*
* // set font variant
* text.fontVariant('small-caps');
*/
Konva.Factory.addGetterSetter(Konva.Text, 'padding', 0);
/**
* set padding
* @name padding
* @method
* @memberof Konva.Text.prototype
* @param {Number} padding
* @returns {Number}
* @example
* // get padding
* var padding = text.padding();
*
* // set padding to 10 pixels
* text.padding(10);
*/
Konva.Factory.addGetterSetter(Konva.Text, 'align', LEFT);
/**
* get/set horizontal align of text. Can be 'left', 'center', 'right' or 'justify'
* @name align
* @method
* @memberof Konva.Text.prototype
* @param {String} align
* @returns {String}
* @example
* // get text align
* var align = text.align();
*
* // center text
* text.align('center');
*
* // align text to right
* text.align('right');
*/
Konva.Factory.addGetterSetter(Konva.Text, 'lineHeight', 1);
/**
* get/set line height. The default is 1.
* @name lineHeight
* @method
* @memberof Konva.Text.prototype
* @param {Number} lineHeight
* @returns {Number}
* @example
* // get line height
* var lineHeight = text.lineHeight();
*
* // set the line height
* text.lineHeight(2);
*/
Konva.Factory.addGetterSetter(Konva.Text, 'wrap', WORD);
/**
* get/set wrap. Can be word, char, or none. Default is word.
* @name wrap
* @method
* @memberof Konva.Text.prototype
* @param {String} wrap
* @returns {String}
* @example
* // get wrap
* var wrap = text.wrap();
*
* // set wrap
* text.wrap('word');
*/
Konva.Factory.addGetterSetter(Konva.Text, 'ellipsis', false);
/**
* get/set ellipsis. Can be true or false. Default is false.
* if Konva.Text config is set to wrap="none" and ellipsis=true, then it will add "..." to the end
* @name ellipsis
* @method
* @memberof Konva.Text.prototype
* @param {Boolean} ellipsis
* @returns {Boolean}
* @example
* // get ellipsis
* var ellipsis = text.ellipsis();
*
* // set ellipsis
* text.ellipsis(true);
*/
Konva.Factory.addGetterSetter(Konva.Text, 'letterSpacing', 0);
/**
* set letter spacing property. Default value is 0.
* @name letterSpacing
* @method
* @memberof Konva.TextPath.prototype
* @param {Number} letterSpacing
*/
Konva.Factory.addGetter(Konva.Text, 'text', EMPTY_STRING);
Konva.Factory.addOverloadedGetterSetter(Konva.Text, 'text');
/**
* get/set text
* @name getText
* @method
* @memberof Konva.Text.prototype
* @param {String} text
* @returns {String}
* @example
* // get text
* var text = text.text();
*
* // set text
* text.text('Hello world!');
*/
Konva.Factory.addGetterSetter(Konva.Text, 'textDecoration', EMPTY_STRING);
/**
* get/set text decoration of a text. Possible values are 'underline', 'line-through' or combination of these values separated by space
* @name textDecoration
* @method
* @memberof Konva.Text.prototype
* @param {String} textDecoration
* @returns {String}
* @example
* // get text decoration
* var textDecoration = text.textDecoration();
*
* // underline text
* text.textDecoration('underline');
*
* // strike text
* text.textDecoration('line-through');
*
* // underline and strike text
* text.textDecoration('underline line-through');
*/
Konva.Collection.mapMethods(Konva.Text);
})();