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Allow user of API to decide whether keyboard events are canceled.

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This commit is contained in:
Michael Jumper
2012-03-29 10:05:38 -07:00
parent e8ee79a5b0
commit eca34b24fb
1 changed files with 82 additions and 71 deletions
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153
guacamole-common-js/src/main/resources/keyboard.js
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@@ -60,8 +60,11 @@ Guacamole.Keyboard = function(element) {
*
* @event
* @param {Number} keysym The keysym of the key being pressed.
* @returns {Boolean} true if the originating event of this keypress should
* be allowed through to the browser, false or undefined
* otherwise.
*/
this.onkeydown = null;
this.onkeydown = null;
/**
* Fired whenever the user releases a key with the element associated
@@ -69,8 +72,11 @@ Guacamole.Keyboard = function(element) {
*
* @event
* @param {Number} keysym The keysym of the key being released.
* @returns {Boolean} true if the originating event of this key release
* should be allowed through to the browser, false or
* undefined otherwise.
*/
this.onkeyup = null;
this.onkeyup = null;
/**
* Map of known JavaScript keycodes which do not map to typable characters
@@ -127,10 +133,10 @@ Guacamole.Keyboard = function(element) {
18: 0xFFE7 // alt
};
// Single key state/modifier buffer
var modShift = false;
var modCtrl = false;
var modAlt = false;
// Single key state/modifier buffer
var modShift = false;
var modCtrl = false;
var modAlt = false;
var keydownChar = new Array();
@@ -138,19 +144,19 @@ Guacamole.Keyboard = function(element) {
var repeatKeyTimeoutId = -1;
var repeatKeyIntervalId = -1;
// Starts repeating keystrokes
function startRepeat(keySym) {
repeatKeyIntervalId = setInterval(function() {
// Starts repeating keystrokes
function startRepeat(keySym) {
repeatKeyIntervalId = setInterval(function() {
sendKeyReleased(keySym);
sendKeyPressed(keySym);
}, 50);
}
}
// Stops repeating keystrokes
function stopRepeat() {
if (repeatKeyTimeoutId != -1) clearInterval(repeatKeyTimeoutId);
if (repeatKeyIntervalId != -1) clearInterval(repeatKeyIntervalId);
}
// Stops repeating keystrokes
function stopRepeat() {
if (repeatKeyTimeoutId != -1) clearInterval(repeatKeyTimeoutId);
if (repeatKeyIntervalId != -1) clearInterval(repeatKeyIntervalId);
}
function getKeySymFromKeyIdentifier(shifted, keyIdentifier) {
@@ -194,8 +200,8 @@ Guacamole.Keyboard = function(element) {
function getKeySymFromKeyCode(keyCode) {
var keysym = null;
if (!modShift) keysym = unshiftedKeySym[keyCode];
else {
if (!modShift) keysym = unshiftedKeySym[keyCode];
else {
keysym = shiftedKeySym[keyCode];
if (keysym == null) keysym = unshiftedKeySym[keyCode];
}
@@ -205,17 +211,19 @@ Guacamole.Keyboard = function(element) {
}
// Sends a single keystroke over the network
function sendKeyPressed(keysym) {
if (keysym != null && guac_keyboard.onkeydown)
guac_keyboard.onkeydown(keysym);
}
// Sends a single keystroke over the network
function sendKeyPressed(keysym) {
if (keysym != null && guac_keyboard.onkeydown)
return guac_keyboard.onkeydown(keysym) != false;
return true;
}
// Sends a single keystroke over the network
function sendKeyReleased(keysym) {
if (keysym != null && guac_keyboard.onkeyup)
guac_keyboard.onkeyup(keysym);
}
// Sends a single keystroke over the network
function sendKeyReleased(keysym) {
if (keysym != null && guac_keyboard.onkeyup)
return guac_keyboard.onkeyup(keysym) != false;
return true;
}
var KEYDOWN = 1;
@@ -223,24 +231,24 @@ Guacamole.Keyboard = function(element) {
var keySymSource = null;
// When key pressed
// When key pressed
var keydownCode = null;
element.onkeydown = function(e) {
element.onkeydown = function(e) {
// Only intercept if handler set
if (!guac_keyboard.onkeydown) return true;
var keynum;
if (window.event) keynum = window.event.keyCode;
else if (e.which) keynum = e.which;
var keynum;
if (window.event) keynum = window.event.keyCode;
else if (e.which) keynum = e.which;
// Ctrl/Alt/Shift
if (keynum == 16)
modShift = true;
else if (keynum == 17)
modCtrl = true;
else if (keynum == 18)
modAlt = true;
// Ctrl/Alt/Shift
if (keynum == 16)
modShift = true;
else if (keynum == 17)
modCtrl = true;
else if (keynum == 18)
modAlt = true;
var keysym = getKeySymFromKeyCode(keynum);
if (keysym) {
@@ -269,11 +277,13 @@ Guacamole.Keyboard = function(element) {
// Send key event here
if (keySymSource == KEYDOWN) {
var returnValue = true;
if (keydownChar[keynum] != keysym) {
// Send event
keydownChar[keynum] = keysym;
sendKeyPressed(keysym);
returnValue = sendKeyPressed(keysym);
// Clear old key repeat, if any.
stopRepeat();
@@ -283,14 +293,14 @@ Guacamole.Keyboard = function(element) {
repeatKeyTimeoutId = setTimeout(function() { startRepeat(keysym); }, 500);
}
return false;
return returnValue;
}
return true;
};
};
// When key pressed
// When key pressed
element.onkeypress = function(e) {
// Only intercept if handler set
@@ -298,10 +308,11 @@ Guacamole.Keyboard = function(element) {
if (keySymSource != KEYPRESS) return false;
var keynum;
if (window.event) keynum = window.event.keyCode;
else if (e.which) keynum = e.which;
var keynum;
if (window.event) keynum = window.event.keyCode;
else if (e.which) keynum = e.which;
var returnValue = true;
var keysym = getKeySymFromCharCode(keynum);
if (keysym && keydownChar[keynum] != keysym) {
@@ -316,32 +327,33 @@ Guacamole.Keyboard = function(element) {
stopRepeat();
// Send key event
sendKeyPressed(keysym);
returnValue = sendKeyPressed(keysym);
// Start repeating (if not a modifier key) after a short delay
repeatKeyTimeoutId = setTimeout(function() { startRepeat(keysym); }, 500);
}
return false;
};
return returnValue;
// When key released
element.onkeyup = function(e) {
};
// When key released
element.onkeyup = function(e) {
// Only intercept if handler set
if (!guac_keyboard.onkeyup) return true;
var keynum;
if (window.event) keynum = window.event.keyCode;
else if (e.which) keynum = e.which;
// Ctrl/Alt/Shift
if (keynum == 16)
modShift = false;
else if (keynum == 17)
modCtrl = false;
else if (keynum == 18)
modAlt = false;
var keynum;
if (window.event) keynum = window.event.keyCode;
else if (e.which) keynum = e.which;
// Ctrl/Alt/Shift
if (keynum == 16)
modShift = false;
else if (keynum == 17)
modCtrl = false;
else if (keynum == 18)
modAlt = false;
else
stopRepeat();
@@ -352,16 +364,15 @@ Guacamole.Keyboard = function(element) {
keydownChar[keynum] = null;
// Send release event
sendKeyReleased(lastKeyDownChar);
return sendKeyReleased(lastKeyDownChar);
return false;
};
};
// When focus is lost, clear modifiers.
element.onblur = function() {
modAlt = false;
modCtrl = false;
modShift = false;
};
// When focus is lost, clear modifiers.
element.onblur = function() {
modAlt = false;
modCtrl = false;
modShift = false;
};
};