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https://github.com/gyurix1968/guacamole-client.git
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GUAC-810: Implement guacTextInput directive.
This commit is contained in:
Michael Jumper
@@ -0,0 +1,289 @@
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/*
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* Copyright (C) 2014 Glyptodon LLC
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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/**
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* A directive which displays the Guacamole text input method.
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*/
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angular.module('textInput').directive('guacTextInput', [function guacTextInput() {
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return {
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restrict: 'E',
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replace: true,
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scope: {},
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templateUrl: 'app/textInput/templates/guacTextInput.html',
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controller: ['$scope', '$rootScope', '$element', '$timeout',
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function guacTextInput($scope, $rootScope, $element, $timeout) {
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/**
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* The number of characters to include on either side of text input
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* content, to allow the user room to use backspace and delete.
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*
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* @type Number
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*/
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var TEXT_INPUT_PADDING = 128;
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/**
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* The Unicode codepoint of the character to use for padding on
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* either side of text input content.
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*
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* @type Number
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*/
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var TEXT_INPUT_PADDING_CODEPOINT = 0x200B;
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/**
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* Recently-sent text, ordered from oldest to most recent.
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*
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* @type String[]
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*/
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$scope.sentText = [];
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/**
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* Whether the "Alt" key is currently pressed within the text input
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* interface.
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*
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* @type Boolean
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*/
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$scope.altPressed = false;
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/**
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* Whether the "Ctrl" key is currently pressed within the text
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* input interface.
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*
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* @type Boolean
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*/
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$scope.ctrlPressed = false;
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/**
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* The text area input target.
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*
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* @type Element
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*/
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var target = $element.find('.target')[0];
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/**
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* Whether the text input target currently has focus. Setting this
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* attribute has no effect, but any bound property will be updated
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* as focus is gained or lost.
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*
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* @type Boolean
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*/
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var hasFocus = false;
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target.onfocus = function targetFocusGained() {
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hasFocus = true;
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resetTextInputTarget(TEXT_INPUT_PADDING);
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};
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target.onblur = function targetFocusLost() {
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hasFocus = false;
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target.focus();
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};
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/**
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* Whether composition is currently active within the text input
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* target element, such as when an IME is in use.
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*
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* @type Boolean
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*/
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var composingText = false;
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target.addEventListener("compositionstart", function targetComposeStart(e) {
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composingText = true;
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}, false);
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target.addEventListener("compositionend", function targetComposeEnd(e) {
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composingText = false;
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}, false);
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/**
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* Translates a given Unicode codepoint into the corresponding X11
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* keysym.
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*
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* @param {Number} codepoint
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* The Unicode codepoint to translate.
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*
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* @returns {Number}
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* The X11 keysym that corresponds to the given Unicode
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* codepoint, or null if no such keysym exists.
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*/
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var keysymFromCodepoint = function keysymFromCodepoint(codepoint) {
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// Keysyms for control characters
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if (codepoint <= 0x1F || (codepoint >= 0x7F && codepoint <= 0x9F))
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return 0xFF00 | codepoint;
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// Keysyms for ASCII chars
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if (codepoint >= 0x0000 && codepoint <= 0x00FF)
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return codepoint;
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// Keysyms for Unicode
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if (codepoint >= 0x0100 && codepoint <= 0x10FFFF)
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return 0x01000000 | codepoint;
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return null;
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};
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/**
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* Presses and releases the key corresponding to the given keysym,
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* as if typed by the user.
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*
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* @param {Number} keysym The keysym of the key to send.
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*/
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var sendKeysym = function sendKeysym(keysym) {
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$rootScope.$broadcast('guacKeydown', keysym);
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$rootScope.$broadcast('guacKeyup', keysym);
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};
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/**
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* Presses and releases the key having the keysym corresponding to
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* the Unicode codepoint given, as if typed by the user.
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*
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* @param {Number} codepoint
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* The Unicode codepoint of the key to send.
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*/
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var sendCodepoint = function sendCodepoint(codepoint) {
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if (codepoint === 10) {
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sendKeysym(0xFF0D);
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releaseStickyKeys();
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return;
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}
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var keysym = keysymFromCodepoint(codepoint);
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if (keysym) {
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sendKeysym(keysym);
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releaseStickyKeys();
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}
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};
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/**
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* Translates each character within the given string to keysyms and
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* sends each, in order, as if typed by the user.
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*
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* @param {String} content
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* The string to send.
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*/
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var sendString = function sendString(content) {
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var sentText = "";
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// Send each codepoint within the string
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for (var i=0; i<content.length; i++) {
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var codepoint = content.charCodeAt(i);
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if (codepoint !== TEXT_INPUT_PADDING_CODEPOINT) {
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sentText += String.fromCharCode(codepoint);
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sendCodepoint(codepoint);
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}
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}
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// Display the text that was sent
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$scope.$apply(function addSentText() {
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$scope.sentText.push(sentText);
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});
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// Remove text after one second
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$timeout(function removeSentText() {
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$scope.sentText.shift();
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}, 1000);
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};
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/**
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* Releases all currently-held sticky keys within the text input UI.
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*/
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var releaseStickyKeys = function releaseStickyKeys() {
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// Reset all sticky keys
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$scope.$apply(function clearAllStickyKeys() {
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$scope.altPressed = false;
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$scope.ctrlPressed = false;
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});
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};
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/**
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* Removes all content from the text input target, replacing it
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* with the given number of padding characters. Padding of the
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* requested size is added on both sides of the cursor, thus the
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* overall number of characters added will be twice the number
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* specified.
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*
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* @param {Number} padding
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* The number of characters to pad the text area with.
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*/
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var resetTextInputTarget = function resetTextInputTarget(padding) {
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var paddingChar = String.fromCharCode(TEXT_INPUT_PADDING_CODEPOINT);
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// Pad text area with an arbitrary, non-typable character (so there is something
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// to delete with backspace or del), and position cursor in middle.
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target.value = new Array(padding*2 + 1).join(paddingChar);
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target.setSelectionRange(padding, padding);
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};
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target.addEventListener("input", function(e) {
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// Ignore input events during text composition
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if (composingText)
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return;
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var i;
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var content = target.value;
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var expectedLength = TEXT_INPUT_PADDING*2;
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// If content removed, update
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if (content.length < expectedLength) {
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// Calculate number of backspaces and send
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var backspaceCount = TEXT_INPUT_PADDING - target.selectionStart;
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for (i = 0; i < backspaceCount; i++)
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sendKeysym(0xFF08);
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// Calculate number of deletes and send
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var deleteCount = expectedLength - content.length - backspaceCount;
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for (i = 0; i < deleteCount; i++)
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sendKeysym(0xFFFF);
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}
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else
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sendString(content);
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// Reset content
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resetTextInputTarget(TEXT_INPUT_PADDING);
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e.preventDefault();
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}, false);
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// Do not allow event target contents to be selected during input
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target.addEventListener("selectstart", function(e) {
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e.preventDefault();
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}, false);
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}]
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};
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}]);
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