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This is part of addressing issue #21 - non-US keyboard layouts. There are several challenges when dealing with keyboard events: - The meaning and use of keyCode, charCode and which depends on both the browser and the event type (keyDown/Up vs keyPress). - We cannot automatically determine the keyboard layout - The keyDown and keyUp events have a keyCode value that has not been translated by modifier keys. - The keyPress event has a translated (for layout and modifiers) character code but the attribute containing it differs. keyCode contains the translated value in WebKit (Chrome/Safari), Opera 11 and IE9. charCode contains the value in WebKit and Firefox. The which attribute contains the value on WebKit, Firefox and Opera 11. - The keyDown/Up keyCode value indicates (sort of) the physical key was pressed but only for standard US layout. On a US keyboard, the '-' and '_' characters are on the same key and generate a keyCode value of 189. But on an AZERTY keyboard even though they are different physical keys they both still generate a keyCode of 189! - To prevent a key event from propagating to the browser and causing unwanted default actions (such as closing a tab, opening a menu, shifting focus, etc) we must suppress this event in both keyDown and keyPress because not all key strokes generate on a keyPress event. Also, in WebKit and IE9 suppressing the keyDown prevents a keyPress but other browsers still generated a keyPress even if keyDown is suppressed. For safe key events, we wait until the keyPress event before reporting a key down event. For unsafe key events, we report a key down event when the keyDown event fires and we suppress any further actions (including keyPress). In order to report a key up event that matches what we reported for the key down event, we keep a list of keys that are currently down. When the keyDown event happens, we add the key event to the list. If it is a safe key event, then we update the which attribute in the most recent item on the list when we received a keyPress event (keyPress should immediately follow keyDown). When we received a keyUp event we search for the event on the list with a matching keyCode and we report the character code using the value in the 'which' attribute that was stored with that key. For character codes above 255 we use a character code to keysym lookup table. This is generated using the util/u2x11 script contributed by Colin Dean (xvpsource.org).
78 lines
2.4 KiB
HTML
78 lines
2.4 KiB
HTML
<!DOCTYPE html>
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<html>
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<head><title>Input Test</title></head>
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<body>
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<br><br>
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Canvas:<br>
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<canvas id="canvas" width="640" height="20"
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style="border-style: dotted; border-width: 1px;">
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Canvas not supported.
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</canvas>
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<br>
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Results:<br>
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<textarea id="messages" style="font-size: 9;" cols=80 rows=25></textarea>
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</body>
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<!--
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<script type='text/javascript'
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src='http://getfirebug.com/releases/lite/1.2/firebug-lite-compressed.js'></script>
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-->
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<script src="../include/util.js"></script>
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<script src="../include/webutil.js"></script>
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<script src="../include/base64.js"></script>
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<script src="../include/input.js"></script>
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<script src="../include/canvas.js"></script>
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<script>
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var msg_cnt = 0;
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var width = 400, height = 200;
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var iterations;
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var newline = "\n";
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if (Util.Engine.trident) {
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var newline = "<br>\n";
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}
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function message(str) {
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console.log(str);
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cell = $D('messages');
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cell.innerHTML += msg_cnt + ": " + str + newline;
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cell.scrollTop = cell.scrollHeight;
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msg_cnt++;
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}
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function mouseButton(x, y, down, bmask) {
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msg = 'mouse x,y: ' + x + ',' + y + ' down: ' + down;
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msg += ' bmask: ' + bmask;
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message(msg);
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}
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function mouseMove(x, y) {
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msg = 'mouse x,y: ' + x + ',' + y;
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//console.log(msg);
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}
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function keyPress(keysym, down, e) {
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var d = down ? "down" : " up ";
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msg = "keyPress " + d + " keysym: " + keysym +
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" (key: " + e.keyCode + ", char: " + e.charCode +
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", which: " + e.which +")";
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message(msg);
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}
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window.onload = function() {
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var canvas = new Canvas({'target' : $D('canvas')});
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keyboard = new Keyboard({'target': document,
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'keyPress': keyPress});
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mouse = new Mouse({'target': $D('canvas'),
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'mouseButton': mouseButton,
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'mouseMove': mouseMove});
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canvas.resize(width, height, true);
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keyboard.grab();
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mouse.grab();
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message("Canvas initialized");
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}
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</script>
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</html>
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