File: /home/cafsindia/snap.cafsinfotech.in/node_modules/fabric/src/mixins/itext_key_behavior.mixin.js
fabric.util.object.extend(fabric.IText.prototype, /** @lends fabric.IText.prototype */ {
/**
* Initializes hidden textarea (needed to bring up keyboard in iOS)
*/
initHiddenTextarea: function() {
this.hiddenTextarea = fabric.document.createElement('textarea');
this.hiddenTextarea.setAttribute('autocapitalize', 'off');
this.hiddenTextarea.setAttribute('autocorrect', 'off');
this.hiddenTextarea.setAttribute('autocomplete', 'off');
this.hiddenTextarea.setAttribute('spellcheck', 'false');
this.hiddenTextarea.setAttribute('data-fabric-hiddentextarea', '');
this.hiddenTextarea.setAttribute('wrap', 'off');
var style = this._calcTextareaPosition();
// line-height: 1px; was removed from the style to fix this:
// https://bugs.chromium.org/p/chromium/issues/detail?id=870966
this.hiddenTextarea.style.cssText = 'position: absolute; top: ' + style.top +
'; left: ' + style.left + '; z-index: -999; opacity: 0; width: 1px; height: 1px; font-size: 1px;' +
' padding-top: ' + style.fontSize + ';';
if (this.hiddenTextareaContainer) {
this.hiddenTextareaContainer.appendChild(this.hiddenTextarea);
}
else {
fabric.document.body.appendChild(this.hiddenTextarea);
}
fabric.util.addListener(this.hiddenTextarea, 'keydown', this.onKeyDown.bind(this));
fabric.util.addListener(this.hiddenTextarea, 'keyup', this.onKeyUp.bind(this));
fabric.util.addListener(this.hiddenTextarea, 'input', this.onInput.bind(this));
fabric.util.addListener(this.hiddenTextarea, 'copy', this.copy.bind(this));
fabric.util.addListener(this.hiddenTextarea, 'cut', this.copy.bind(this));
fabric.util.addListener(this.hiddenTextarea, 'paste', this.paste.bind(this));
fabric.util.addListener(this.hiddenTextarea, 'compositionstart', this.onCompositionStart.bind(this));
fabric.util.addListener(this.hiddenTextarea, 'compositionupdate', this.onCompositionUpdate.bind(this));
fabric.util.addListener(this.hiddenTextarea, 'compositionend', this.onCompositionEnd.bind(this));
if (!this._clickHandlerInitialized && this.canvas) {
fabric.util.addListener(this.canvas.upperCanvasEl, 'click', this.onClick.bind(this));
this._clickHandlerInitialized = true;
}
},
/**
* For functionalities on keyDown
* Map a special key to a function of the instance/prototype
* If you need different behaviour for ESC or TAB or arrows, you have to change
* this map setting the name of a function that you build on the fabric.Itext or
* your prototype.
* the map change will affect all Instances unless you need for only some text Instances
* in that case you have to clone this object and assign your Instance.
* this.keysMap = fabric.util.object.clone(this.keysMap);
* The function must be in fabric.Itext.prototype.myFunction And will receive event as args[0]
*/
keysMap: {
9: 'exitEditing',
27: 'exitEditing',
33: 'moveCursorUp',
34: 'moveCursorDown',
35: 'moveCursorRight',
36: 'moveCursorLeft',
37: 'moveCursorLeft',
38: 'moveCursorUp',
39: 'moveCursorRight',
40: 'moveCursorDown',
},
keysMapRtl: {
9: 'exitEditing',
27: 'exitEditing',
33: 'moveCursorUp',
34: 'moveCursorDown',
35: 'moveCursorLeft',
36: 'moveCursorRight',
37: 'moveCursorRight',
38: 'moveCursorUp',
39: 'moveCursorLeft',
40: 'moveCursorDown',
},
/**
* For functionalities on keyUp + ctrl || cmd
*/
ctrlKeysMapUp: {
67: 'copy',
88: 'cut'
},
/**
* For functionalities on keyDown + ctrl || cmd
*/
ctrlKeysMapDown: {
65: 'selectAll'
},
onClick: function() {
// No need to trigger click event here, focus is enough to have the keyboard appear on Android
this.hiddenTextarea && this.hiddenTextarea.focus();
},
/**
* Handles keydown event
* only used for arrows and combination of modifier keys.
* @param {Event} e Event object
*/
onKeyDown: function(e) {
if (!this.isEditing) {
return;
}
var keyMap = this.direction === 'rtl' ? this.keysMapRtl : this.keysMap;
if (e.keyCode in keyMap) {
this[keyMap[e.keyCode]](e);
}
else if ((e.keyCode in this.ctrlKeysMapDown) && (e.ctrlKey || e.metaKey)) {
this[this.ctrlKeysMapDown[e.keyCode]](e);
}
else {
return;
}
e.stopImmediatePropagation();
e.preventDefault();
if (e.keyCode >= 33 && e.keyCode <= 40) {
// if i press an arrow key just update selection
this.inCompositionMode = false;
this.clearContextTop();
this.renderCursorOrSelection();
}
else {
this.canvas && this.canvas.requestRenderAll();
}
},
/**
* Handles keyup event
* We handle KeyUp because ie11 and edge have difficulties copy/pasting
* if a copy/cut event fired, keyup is dismissed
* @param {Event} e Event object
*/
onKeyUp: function(e) {
if (!this.isEditing || this._copyDone || this.inCompositionMode) {
this._copyDone = false;
return;
}
if ((e.keyCode in this.ctrlKeysMapUp) && (e.ctrlKey || e.metaKey)) {
this[this.ctrlKeysMapUp[e.keyCode]](e);
}
else {
return;
}
e.stopImmediatePropagation();
e.preventDefault();
this.canvas && this.canvas.requestRenderAll();
},
/**
* Handles onInput event
* @param {Event} e Event object
*/
onInput: function(e) {
var fromPaste = this.fromPaste;
this.fromPaste = false;
e && e.stopPropagation();
if (!this.isEditing) {
return;
}
// decisions about style changes.
var nextText = this._splitTextIntoLines(this.hiddenTextarea.value).graphemeText,
charCount = this._text.length,
nextCharCount = nextText.length,
removedText, insertedText,
charDiff = nextCharCount - charCount,
selectionStart = this.selectionStart, selectionEnd = this.selectionEnd,
selection = selectionStart !== selectionEnd,
copiedStyle, removeFrom, removeTo;
if (this.hiddenTextarea.value === '') {
this.styles = { };
this.updateFromTextArea();
this.fire('changed');
if (this.canvas) {
this.canvas.fire('text:changed', { target: this });
this.canvas.requestRenderAll();
}
return;
}
var textareaSelection = this.fromStringToGraphemeSelection(
this.hiddenTextarea.selectionStart,
this.hiddenTextarea.selectionEnd,
this.hiddenTextarea.value
);
var backDelete = selectionStart > textareaSelection.selectionStart;
if (selection) {
removedText = this._text.slice(selectionStart, selectionEnd);
charDiff += selectionEnd - selectionStart;
}
else if (nextCharCount < charCount) {
if (backDelete) {
removedText = this._text.slice(selectionEnd + charDiff, selectionEnd);
}
else {
removedText = this._text.slice(selectionStart, selectionStart - charDiff);
}
}
insertedText = nextText.slice(textareaSelection.selectionEnd - charDiff, textareaSelection.selectionEnd);
if (removedText && removedText.length) {
if (insertedText.length) {
// let's copy some style before deleting.
// we want to copy the style before the cursor OR the style at the cursor if selection
// is bigger than 0.
copiedStyle = this.getSelectionStyles(selectionStart, selectionStart + 1, false);
// now duplicate the style one for each inserted text.
copiedStyle = insertedText.map(function() {
// this return an array of references, but that is fine since we are
// copying the style later.
return copiedStyle[0];
});
}
if (selection) {
removeFrom = selectionStart;
removeTo = selectionEnd;
}
else if (backDelete) {
// detect differences between forwardDelete and backDelete
removeFrom = selectionEnd - removedText.length;
removeTo = selectionEnd;
}
else {
removeFrom = selectionEnd;
removeTo = selectionEnd + removedText.length;
}
this.removeStyleFromTo(removeFrom, removeTo);
}
if (insertedText.length) {
if (fromPaste && insertedText.join('') === fabric.copiedText && !fabric.disableStyleCopyPaste) {
copiedStyle = fabric.copiedTextStyle;
}
this.insertNewStyleBlock(insertedText, selectionStart, copiedStyle);
}
this.updateFromTextArea();
this.fire('changed');
if (this.canvas) {
this.canvas.fire('text:changed', { target: this });
this.canvas.requestRenderAll();
}
},
/**
* Composition start
*/
onCompositionStart: function() {
this.inCompositionMode = true;
},
/**
* Composition end
*/
onCompositionEnd: function() {
this.inCompositionMode = false;
},
// /**
// * Composition update
// */
onCompositionUpdate: function(e) {
this.compositionStart = e.target.selectionStart;
this.compositionEnd = e.target.selectionEnd;
this.updateTextareaPosition();
},
/**
* Copies selected text
* @param {Event} e Event object
*/
copy: function() {
if (this.selectionStart === this.selectionEnd) {
//do not cut-copy if no selection
return;
}
fabric.copiedText = this.getSelectedText();
if (!fabric.disableStyleCopyPaste) {
fabric.copiedTextStyle = this.getSelectionStyles(this.selectionStart, this.selectionEnd, true);
}
else {
fabric.copiedTextStyle = null;
}
this._copyDone = true;
},
/**
* Pastes text
* @param {Event} e Event object
*/
paste: function() {
this.fromPaste = true;
},
/**
* @private
* @param {Event} e Event object
* @return {Object} Clipboard data object
*/
_getClipboardData: function(e) {
return (e && e.clipboardData) || fabric.window.clipboardData;
},
/**
* Finds the width in pixels before the cursor on the same line
* @private
* @param {Number} lineIndex
* @param {Number} charIndex
* @return {Number} widthBeforeCursor width before cursor
*/
_getWidthBeforeCursor: function(lineIndex, charIndex) {
var widthBeforeCursor = this._getLineLeftOffset(lineIndex), bound;
if (charIndex > 0) {
bound = this.__charBounds[lineIndex][charIndex - 1];
widthBeforeCursor += bound.left + bound.width;
}
return widthBeforeCursor;
},
/**
* Gets start offset of a selection
* @param {Event} e Event object
* @param {Boolean} isRight
* @return {Number}
*/
getDownCursorOffset: function(e, isRight) {
var selectionProp = this._getSelectionForOffset(e, isRight),
cursorLocation = this.get2DCursorLocation(selectionProp),
lineIndex = cursorLocation.lineIndex;
// if on last line, down cursor goes to end of line
if (lineIndex === this._textLines.length - 1 || e.metaKey || e.keyCode === 34) {
// move to the end of a text
return this._text.length - selectionProp;
}
var charIndex = cursorLocation.charIndex,
widthBeforeCursor = this._getWidthBeforeCursor(lineIndex, charIndex),
indexOnOtherLine = this._getIndexOnLine(lineIndex + 1, widthBeforeCursor),
textAfterCursor = this._textLines[lineIndex].slice(charIndex);
return textAfterCursor.length + indexOnOtherLine + 1 + this.missingNewlineOffset(lineIndex);
},
/**
* private
* Helps finding if the offset should be counted from Start or End
* @param {Event} e Event object
* @param {Boolean} isRight
* @return {Number}
*/
_getSelectionForOffset: function(e, isRight) {
if (e.shiftKey && this.selectionStart !== this.selectionEnd && isRight) {
return this.selectionEnd;
}
else {
return this.selectionStart;
}
},
/**
* @param {Event} e Event object
* @param {Boolean} isRight
* @return {Number}
*/
getUpCursorOffset: function(e, isRight) {
var selectionProp = this._getSelectionForOffset(e, isRight),
cursorLocation = this.get2DCursorLocation(selectionProp),
lineIndex = cursorLocation.lineIndex;
if (lineIndex === 0 || e.metaKey || e.keyCode === 33) {
// if on first line, up cursor goes to start of line
return -selectionProp;
}
var charIndex = cursorLocation.charIndex,
widthBeforeCursor = this._getWidthBeforeCursor(lineIndex, charIndex),
indexOnOtherLine = this._getIndexOnLine(lineIndex - 1, widthBeforeCursor),
textBeforeCursor = this._textLines[lineIndex].slice(0, charIndex),
missingNewlineOffset = this.missingNewlineOffset(lineIndex - 1);
// return a negative offset
return -this._textLines[lineIndex - 1].length
+ indexOnOtherLine - textBeforeCursor.length + (1 - missingNewlineOffset);
},
/**
* for a given width it founds the matching character.
* @private
*/
_getIndexOnLine: function(lineIndex, width) {
var line = this._textLines[lineIndex],
lineLeftOffset = this._getLineLeftOffset(lineIndex),
widthOfCharsOnLine = lineLeftOffset,
indexOnLine = 0, charWidth, foundMatch;
for (var j = 0, jlen = line.length; j < jlen; j++) {
charWidth = this.__charBounds[lineIndex][j].width;
widthOfCharsOnLine += charWidth;
if (widthOfCharsOnLine > width) {
foundMatch = true;
var leftEdge = widthOfCharsOnLine - charWidth,
rightEdge = widthOfCharsOnLine,
offsetFromLeftEdge = Math.abs(leftEdge - width),
offsetFromRightEdge = Math.abs(rightEdge - width);
indexOnLine = offsetFromRightEdge < offsetFromLeftEdge ? j : (j - 1);
break;
}
}
// reached end
if (!foundMatch) {
indexOnLine = line.length - 1;
}
return indexOnLine;
},
/**
* Moves cursor down
* @param {Event} e Event object
*/
moveCursorDown: function(e) {
if (this.selectionStart >= this._text.length && this.selectionEnd >= this._text.length) {
return;
}
this._moveCursorUpOrDown('Down', e);
},
/**
* Moves cursor up
* @param {Event} e Event object
*/
moveCursorUp: function(e) {
if (this.selectionStart === 0 && this.selectionEnd === 0) {
return;
}
this._moveCursorUpOrDown('Up', e);
},
/**
* Moves cursor up or down, fires the events
* @param {String} direction 'Up' or 'Down'
* @param {Event} e Event object
*/
_moveCursorUpOrDown: function(direction, e) {
// getUpCursorOffset
// getDownCursorOffset
var action = 'get' + direction + 'CursorOffset',
offset = this[action](e, this._selectionDirection === 'right');
if (e.shiftKey) {
this.moveCursorWithShift(offset);
}
else {
this.moveCursorWithoutShift(offset);
}
if (offset !== 0) {
this.setSelectionInBoundaries();
this.abortCursorAnimation();
this._currentCursorOpacity = 1;
this.initDelayedCursor();
this._fireSelectionChanged();
this._updateTextarea();
}
},
/**
* Moves cursor with shift
* @param {Number} offset
*/
moveCursorWithShift: function(offset) {
var newSelection = this._selectionDirection === 'left'
? this.selectionStart + offset
: this.selectionEnd + offset;
this.setSelectionStartEndWithShift(this.selectionStart, this.selectionEnd, newSelection);
return offset !== 0;
},
/**
* Moves cursor up without shift
* @param {Number} offset
*/
moveCursorWithoutShift: function(offset) {
if (offset < 0) {
this.selectionStart += offset;
this.selectionEnd = this.selectionStart;
}
else {
this.selectionEnd += offset;
this.selectionStart = this.selectionEnd;
}
return offset !== 0;
},
/**
* Moves cursor left
* @param {Event} e Event object
*/
moveCursorLeft: function(e) {
if (this.selectionStart === 0 && this.selectionEnd === 0) {
return;
}
this._moveCursorLeftOrRight('Left', e);
},
/**
* @private
* @return {Boolean} true if a change happened
*/
_move: function(e, prop, direction) {
var newValue;
if (e.altKey) {
newValue = this['findWordBoundary' + direction](this[prop]);
}
else if (e.metaKey || e.keyCode === 35 || e.keyCode === 36 ) {
newValue = this['findLineBoundary' + direction](this[prop]);
}
else {
this[prop] += direction === 'Left' ? -1 : 1;
return true;
}
if (typeof newValue !== 'undefined' && this[prop] !== newValue) {
this[prop] = newValue;
return true;
}
},
/**
* @private
*/
_moveLeft: function(e, prop) {
return this._move(e, prop, 'Left');
},
/**
* @private
*/
_moveRight: function(e, prop) {
return this._move(e, prop, 'Right');
},
/**
* Moves cursor left without keeping selection
* @param {Event} e
*/
moveCursorLeftWithoutShift: function(e) {
var change = true;
this._selectionDirection = 'left';
// only move cursor when there is no selection,
// otherwise we discard it, and leave cursor on same place
if (this.selectionEnd === this.selectionStart && this.selectionStart !== 0) {
change = this._moveLeft(e, 'selectionStart');
}
this.selectionEnd = this.selectionStart;
return change;
},
/**
* Moves cursor left while keeping selection
* @param {Event} e
*/
moveCursorLeftWithShift: function(e) {
if (this._selectionDirection === 'right' && this.selectionStart !== this.selectionEnd) {
return this._moveLeft(e, 'selectionEnd');
}
else if (this.selectionStart !== 0){
this._selectionDirection = 'left';
return this._moveLeft(e, 'selectionStart');
}
},
/**
* Moves cursor right
* @param {Event} e Event object
*/
moveCursorRight: function(e) {
if (this.selectionStart >= this._text.length && this.selectionEnd >= this._text.length) {
return;
}
this._moveCursorLeftOrRight('Right', e);
},
/**
* Moves cursor right or Left, fires event
* @param {String} direction 'Left', 'Right'
* @param {Event} e Event object
*/
_moveCursorLeftOrRight: function(direction, e) {
var actionName = 'moveCursor' + direction + 'With';
this._currentCursorOpacity = 1;
if (e.shiftKey) {
actionName += 'Shift';
}
else {
actionName += 'outShift';
}
if (this[actionName](e)) {
this.abortCursorAnimation();
this.initDelayedCursor();
this._fireSelectionChanged();
this._updateTextarea();
}
},
/**
* Moves cursor right while keeping selection
* @param {Event} e
*/
moveCursorRightWithShift: function(e) {
if (this._selectionDirection === 'left' && this.selectionStart !== this.selectionEnd) {
return this._moveRight(e, 'selectionStart');
}
else if (this.selectionEnd !== this._text.length) {
this._selectionDirection = 'right';
return this._moveRight(e, 'selectionEnd');
}
},
/**
* Moves cursor right without keeping selection
* @param {Event} e Event object
*/
moveCursorRightWithoutShift: function(e) {
var changed = true;
this._selectionDirection = 'right';
if (this.selectionStart === this.selectionEnd) {
changed = this._moveRight(e, 'selectionStart');
this.selectionEnd = this.selectionStart;
}
else {
this.selectionStart = this.selectionEnd;
}
return changed;
},
/**
* Removes characters from start/end
* start/end ar per grapheme position in _text array.
*
* @param {Number} start
* @param {Number} end default to start + 1
*/
removeChars: function(start, end) {
if (typeof end === 'undefined') {
end = start + 1;
}
this.removeStyleFromTo(start, end);
this._text.splice(start, end - start);
this.text = this._text.join('');
this.set('dirty', true);
if (this._shouldClearDimensionCache()) {
this.initDimensions();
this.setCoords();
}
this._removeExtraneousStyles();
},
/**
* insert characters at start position, before start position.
* start equal 1 it means the text get inserted between actual grapheme 0 and 1
* if style array is provided, it must be as the same length of text in graphemes
* if end is provided and is bigger than start, old text is replaced.
* start/end ar per grapheme position in _text array.
*
* @param {String} text text to insert
* @param {Array} style array of style objects
* @param {Number} start
* @param {Number} end default to start + 1
*/
insertChars: function(text, style, start, end) {
if (typeof end === 'undefined') {
end = start;
}
if (end > start) {
this.removeStyleFromTo(start, end);
}
var graphemes = fabric.util.string.graphemeSplit(text);
this.insertNewStyleBlock(graphemes, start, style);
this._text = [].concat(this._text.slice(0, start), graphemes, this._text.slice(end));
this.text = this._text.join('');
this.set('dirty', true);
if (this._shouldClearDimensionCache()) {
this.initDimensions();
this.setCoords();
}
this._removeExtraneousStyles();
},
});