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Added multiline + text wrap support for textarea #261

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Added multiline + text wrap support for textarea #261

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119 changes: 92 additions & 27 deletions src/Parse.js
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Expand Up @@ -164,33 +164,98 @@ _html2canvas.Parse = function (images, options) {
};

if (_html2canvas.Util.trimText(textNode.nodeValue).length > 0) {
textNode.nodeValue = textTransform(textNode.nodeValue, getCSS(el, "textTransform"));
textAlign = textAlign.replace(["-webkit-auto"],["auto"]);

textList = (!options.letterRendering && /^(left|right|justify|auto)$/.test(textAlign) && noLetterSpacing(getCSS(el, "letterSpacing"))) ?
textNode.nodeValue.split(/(\b| )/)
: textNode.nodeValue.split("");

metrics = setTextVariables(ctx, el, textDecoration, color);

if (options.chinese) {
textList.forEach(function(word, index) {
if (/.*[\u4E00-\u9FA5].*$/.test(word)) {
word = word.split("");
word.unshift(index, 1);
textList.splice.apply(textList, word);
}
});
}

textList.forEach(function(text, index) {
var bounds = getTextBounds(state, text, textDecoration, (index < textList.length - 1));
if (bounds) {
drawText(text, bounds.left, bounds.bottom, ctx);
renderTextDecoration(ctx, textDecoration, bounds, metrics, color);
}
});
}
textNode.nodeValue = textTransform(textNode.nodeValue, getCSS(el, "textTransform"));
textAlign = textAlign.replace(["-webkit-auto"],["auto"]);

textList = (!options.letterRendering && /^(left|right|justify|auto)$/.test(textAlign) && noLetterSpacing(getCSS(el, "letterSpacing"))) ?
textNode.nodeValue.match(/\S+|\s/g)
: textNode.nodeValue.split("");

metrics = setTextVariables(ctx, el, textDecoration, color);

if (options.chinese) {
textList.forEach(function(word, index) {
if (/.*[\u4E00-\u9FA5].*$/.test(word)) {
word = word.split("");
word.unshift(index, 1);
textList.splice.apply(textList, word);
}
});
}

if(el.nodeName == 'TEXTAREA') {
var elemLineHeight = +(window.getComputedStyle(el).getPropertyValue('line-height')||'').replace('px','');
// Multiline rendering support
var multilineData = {
lines: [],
offsetTop: 0,
height: elemLineHeight
};

// group textList elements into lines
var currentLine = [];
textList.forEach(function(text,index){
if(text != "\n") currentLine.push(text);
if(text == "\n" || (index==textList.length-1)) {
multilineData.lines.push(currentLine);
currentLine = [];
}
});

// draw line by line
multilineData.lines.forEach(function(line){

state.textOffset = 0;
state.node.nodeValue = line.join('');

// line measurements. These numbers are to account for the height of a wrapped line
var top = null; // top of line
var bottom = null; // bottom of line
var charHeight = null; // height of character (different from lineHeight)

// render wrapped text, draw chunk by chunk
line.forEach(function(text, index) {
var bounds = getTextBounds(state, text, textDecoration, (index < textList.length - 1));
if (bounds) {
// since ClientRect bounds properties are readonly,
// we create a raw object to manipulate its properties
bounds = {
top: bounds.top + multilineData.offsetTop,
bottom: bounds.bottom + multilineData.offsetTop,
height: bounds.height,
left: bounds.left,
right: bounds.right,
width: bounds.width
};

// set the line measurements
if(top === null) top = bounds.top;
if(charHeight === null) charHeight = bounds.height;
bottom = bounds.bottom;

drawText(text, bounds.left, bounds.bottom, ctx);
renderTextDecoration(ctx, textDecoration, bounds, metrics, color);
}
});

// calculate offset between element's lineHeight value and character height
var charOffset = multilineData.height - +charHeight;
// calculate official line offset
var totalLineHeight = +bottom - +top + charOffset;

// increase the line offset
multilineData.offsetTop += totalLineHeight;
});
} else {
textList.forEach(function(text, index) {
var bounds = getTextBounds(state, text, textDecoration, (index < textList.length - 1));
if (bounds) {
drawText(text, bounds.left, bounds.bottom, ctx);
renderTextDecoration(ctx, textDecoration, bounds, metrics, color);
}
});
}
}
}

function listPosition (element, val) {
Expand Down