Press n or j to go to the next uncovered block, b, p or k for the previous block.
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type CursorPosition = {
start: number;
end: number;
}
interface UserKeyPressed {
iShouldDealIt: boolean; // =false
unicodeKey: string; // ="\u0041"
shiftKeyPressed: boolean; // =false
replaceLastChar: boolean; // =false
placeTo: number; // =3
position: CursorPosition; // { 1,8 }
characterType: number; // 1~7
}
type PartialUserKeyPressed = Partial<UserKeyPressed>;
export class KeyboardHandler {
public letterInformation: LetterInformation;
private oEvent: KeyboardEvent;
private textInputSource: HTMLTextAreaElement | HTMLInputElement;
constructor() {
this.letterInformation = new LetterInformation();
}
selectKeyPressed(): PartialUserKeyPressed {
var keyPressed = this.oEvent.key;
var position: CursorPosition = this.cursorPosition();
// delete or backspace - for immediate change
if (keyPressed === 'Delete' || keyPressed === 'Backspace') {
let keyCodeForBackspace: PartialUserKeyPressed = {
unicodeKey: keyPressed,
iShouldDealIt: true,
placeTo: position.start,
position: position
};
return keyCodeForBackspace;
}
// using ctrl+m or F9 button to language switch
if ((this.oEvent.ctrlKey == true && keyPressed === 'm') || keyPressed === 'F9') {
let _C = this.letterInformation.currentLanguage === "bn_BD" ? "en_US" : "bn_BD";
this.letterInformation.currentLanguage = _C;
}
// ctrl, shift, alt, alt-grp, up arrow, down arrow
if (this.oEvent.ctrlKey || this.oEvent.altKey || this.oEvent.metaKey || ['ArrowUp', 'ArrowDown', 'ArrowRight', 'ArrowLeft', 'Escape', 'Insert', 'PageUp', 'PageDown', 'Alt' ].indexOf(keyPressed) >= 0) {
return {
iShouldDealIt: false
};
}
var unicodeKey = "";
var charCode = keyPressed.charCodeAt(0);
// letters: A-Z and a-z
var isLetter = (c:string) => c.toLowerCase() != c.toUpperCase() && c.length == 1;
var isNumber = (str:string) => !isNaN(parseInt(str)) && str.length == 1;
if (keyPressed >= 'A' && keyPressed <= 'Z' && isLetter(keyPressed)) {
unicodeKey = this.letterInformation.letterKeyMap[charCode - 'A'.charCodeAt(0)][1];
}
else if (keyPressed >= 'a' && keyPressed <= 'z' && isLetter(keyPressed)) {
unicodeKey = this.letterInformation.letterKeyMap[charCode - 'a'.charCodeAt(0)][0];
}
// numbers: 0-9
else if ( (keyPressed >= '0' && keyPressed <= '9') && isNumber(keyPressed) ) {
unicodeKey = this.letterInformation.numberKeyMap[charCode - '0'.charCodeAt(0)][0];
}
// taka symbol
else if (keyPressed === '$')
unicodeKey = "\u09f3";
// full-stop from keyboard/numpad
else if (keyPressed === ".")
unicodeKey = "\u0964";
// shift with plus-sign, replace with Q[0] or hasanta
else if (keyPressed === '+')
unicodeKey = this.letterInformation.letterKeyMap['q'.charCodeAt(0) - 'a'.charCodeAt(0)][0];
// not in scope and nothing to handle
else return {
iShouldDealIt: false
};
// change last character using `h`
var replaceLastChar = (keyPressed === 'h') && !this.oEvent.shiftKey;
let userTypedKey: PartialUserKeyPressed = {
iShouldDealIt: true, // =false
unicodeKey: unicodeKey, // ="\u0041"
shiftKeyPressed: this.oEvent.shiftKey, // =false
replaceLastChar: replaceLastChar, // =false
placeTo: position.start, // =3
position: position, // { 1,8 }
characterType: <number>this.letterInformation.getFollower(unicodeKey, 1) // 1~7
};
return userTypedKey;
}
handleKeyboardInput(oEvent: KeyboardEvent, oSource: HTMLInputElement | HTMLTextAreaElement): boolean {
this.textInputSource = oSource;
this.oEvent = oEvent;
var prev: string = "", prevPrev = "", nextNext = "",
text: string = !!oSource ? this.textInputSource.value : "", prevCharacterType: number = 0;
var keyState = this.selectKeyPressed();
// <summary>Decision; Should script continue or not</summary>
if (keyState.iShouldDealIt === false || this.letterInformation.currentLanguage === "en_US") {
return true;
}
// set previous and next characters
if (keyState.placeTo >= 2) {
prevPrev = text.charAt(keyState.placeTo - 2);
prev = text.charAt(keyState.placeTo - 1);
prevCharacterType = <number>this.letterInformation.getFollower(prev, 1);
}
else if (keyState.placeTo === 1) {
prev = text.charAt(keyState.placeTo - 1);
prevCharacterType = <number>this.letterInformation.getFollower(prev, 1);
}
/**************************************
unicodeKey change if necessary
***************************************/
// consonant+h type input or hasanta pressed twice
keyState.replaceLastChar = keyState.replaceLastChar || (prev === "\u09CD" && keyState.unicodeKey === "\u09CD");
if (keyState.replaceLastChar) {
// if hasanta then +
if (prevCharacterType == LetterType.HASANTA && keyState.unicodeKey === "\u09CD") {
keyState.unicodeKey = "\u002B";
}
// if hasanta and h then force end at hasanta
else if (prevCharacterType == LetterType.HASANTA && keyState.unicodeKey === "") {
keyState.unicodeKey = "\u09CD" + this.letterInformation.ZWNJ;
}
// other
else if (prevCharacterType === LetterType.VOWEL_IN_KAR_FORM)
keyState.unicodeKey = <string>this.letterInformation.getFollower(prev, 2);
else if (prevCharacterType === LetterType.VOWEL_IN_FULL_FORM)
keyState.unicodeKey = this.letterInformation.ZWNJ + this.letterInformation.getFollower(prev, 2);
else
keyState.unicodeKey = <string>this.letterInformation.getFollower(prev, 2);
// if valid key reduce start position-1 because this will not be inserted
if (keyState.unicodeKey.length > 0) {
keyState.placeTo -= 1;
keyState.position.start -= 1;
}
}
// rab => r za-fola
if (keyState.unicodeKey === "\u09cd\u09af" && prev === "\u09b0") {
// grand hotel spelling
if (keyState.position.start > 0 && this.letterInformation.getFollower(prevPrev, 1) === 4)
keyState.unicodeKey = "\u09cd" + "\u09af";
else {
keyState.position.start -= 1;
keyState.unicodeKey = "\u09b0" + this.letterInformation.ZWNJ + "\u09cd" + "\u09af";
}
}
// same vowel pressed twice will cause a switch
if (prev === keyState.unicodeKey && (prevCharacterType === LetterType.VOWEL_IN_KAR_FORM || prevCharacterType === LetterType.VOWEL_IN_FULL_FORM)) {
var temp = <string> this.letterInformation.getConsecutiveVowel(keyState.unicodeKey);
// for "onamika" => no switch character because switching a character with same character insert nothing
if (temp.length > 0) {
keyState.position.start -= 1;
keyState.unicodeKey = temp;
}
else
keyState.unicodeKey = <string>this.letterInformation.getFollower(keyState.unicodeKey, 2);
}
// change vowel in full-form to kar-form if prevCharacterType is not consonant/fola
else if (keyState.characterType === LetterType.VOWEL_IN_KAR_FORM && !(prevCharacterType === LetterType.CONSONANT || prevCharacterType === LetterType.FOLA)) {
keyState.unicodeKey = <string>this.letterInformation.getFollower(keyState.unicodeKey, 2);
}
// fullstop button pressed twice will cause a dot ..
if (prev === "\u0964" && keyState.unicodeKey === "\u0964") {
keyState.unicodeKey = "\u002E";
keyState.position.start -= 1;
}
// <summary>Backspace or Delete</summary>
// prevPrev is hasanta
if (keyState.unicodeKey === 'Backspace') {
// if end==start then selected text so cursor should not move; otherwise should
keyState.position.start -= +(keyState.position.start === keyState.position.end);
if (prevPrev === "\u09CD" || prevPrev === this.letterInformation.ZWNJ)
keyState.position.start -= 1;
if (keyState.position.start < 0)
keyState.position.start = 0;
}
// nextNext is hasanta
else if (keyState.unicodeKey === 'Delete') {
// if end==start then selected text so cursor should not move; otherwise should
keyState.position.end += +(keyState.position.start === keyState.position.end);
keyState.position.end += nextNext === "\u09CD" ? 1 : 0;
}
// For Delete/Backspace, nothing should be written
if (keyState.unicodeKey == 'Delete' || keyState.unicodeKey == 'Backspace'){
keyState.unicodeKey = "";
}
// <summary>Final data preparation</summary>
var firstPortion = text.slice(0, keyState.position.start);
var lastPortion = text.slice(keyState.position.end);
var finalText = firstPortion + keyState.unicodeKey + lastPortion;
var caretPosition = keyState.position.start + keyState.unicodeKey.length;
// <summary>Write final data and update caret</summary>
var scrollTop = this.textInputSource.scrollTop;
this.textInputSource.value = finalText;
this.textInputSource.focus();
this.textInputSource.scrollTop = scrollTop;
this.textInputSource.setSelectionRange(caretPosition, caretPosition);
return false;
}
// No support beyond IE <= 8. Details here: http://stackoverflow.com/a/16106012/385205
cursorPosition(): CursorPosition {
return {
start: this.textInputSource.selectionStart,
end: this.textInputSource.selectionEnd
};
};
} |