我有 emscripten 编译的 c++ 代码(使用 openGL)在我的网页中运行(转换为 WebGL)并呈现图像。一切都很好,除了当我在网页上键入 textarea
时,Emscripten 编译的 Javascript 阻止我使用“删除”、“退格”、“tab”键。请注意,所有字母键和“空格”都可以正常工作。
作为引用,我在 JavaScript 代码中实例化的模块与默认模块几乎完全相同:
var Module = {
preRun: [],
postRun: [],
print: (function() {
var element = document.getElementById('emscriptenOutput');
if (element) element.value = ''; // clear browser cache
return function(text) {
if (arguments.length > 1) text = Array.prototype.slice.call(arguments).join(' ');
// These replacements are necessary if you render to raw HTML
//text = text.replace(/&/g, "&");
//text = text.replace(/</g, "<");
//text = text.replace(/>/g, ">");
//text = text.replace('\n', '<br>', 'g');
console.log(text);
if (element) {
element.value += text + "\n";
element.scrollTop = element.scrollHeight; // focus on bottom
}
};
})(),
printErr: function(text) {
if (arguments.length > 1) text = Array.prototype.slice.call(arguments).join(' ');
if (0) { // XXX disabled for safety typeof dump == 'function') {
dump(text + '\n'); // fast, straight to the real console
} else {
console.error(text);
}
},
canvas: (function() {
var canvas = document.getElementById('canvas');
// As a default initial behavior, pop up an alert when webgl context is lost. To make your
// application robust, you may want to override this behavior before shipping!
// See http://www.khronos.org/registry/webgl/specs/latest/1.0/#5.15.2
canvas.addEventListener("webglcontextlost", function(e) { alert('WebGL context lost. You will need to reload the page.'); e.preventDefault(); }, false);
return canvas;
})(),
totalDependencies: 0,
//doNotCaptureKeyboard: true,
monitorRunDependencies: function(left) {
this.totalDependencies = Math.max(this.totalDependencies, left);
// Module.setStatus(left ? 'Preparing... (' + (this.totalDependencies-left) + '/' + this.totalDependencies + ')' : 'All downloads complete.');
}
};
(function() {
var memoryInitializer = 'renderer.js.mem';
if (typeof Module['locateFile'] === 'function') {
memoryInitializer = Module['locateFile'](memoryInitializer);
} else if (Module['memoryInitializerPrefixURL']) {
memoryInitializer = Module['memoryInitializerPrefixURL'] + memoryInitializer;
}
var meminitXHR = Module['memoryInitializerRequest'] = new XMLHttpRequest();
meminitXHR.open('GET', memoryInitializer, true);
meminitXHR.responseType = 'arraybuffer';
meminitXHR.send(null);
})();
var script = document.createElement('script');
script.src = "renderer.js";
document.body.appendChild(script);
当然,emscripten 编译的 JavaScript 对人眼来说是乱码,但罪魁祸首很可能就在那里。
我的猜测是 WebGL 上下文正在占用键盘事件,但我不确定。我查看了这些链接并尝试将“doNotCaptureKeyboard: true”包含到模块元素中,但没有成功。
https://forum.unity.com/threads/disable-enable-keyboard-in-runtime-webgl.286557/#post-1892527 https://github.com/kripken/emscripten/issues/2668#event-154218404
有人遇到过类似的问题吗?我很茫然。
最佳答案
对于那些好奇的人,我有一个解决方案,但不确定它是否是最好的。我刚刚添加了自己的事件监听器来阻止已编译 JavaScript 代码的事件监听器:
/* code to prevent emscripten compiled code from eating key input */
window.addEventListener('keydown', function(event){
event.stopImmediatePropagation();
}, true);
window.addEventListener('keyup', function(event){
event.stopImmediatePropagation();
}, true);
关于javascript - 防止 Emscripten 编译的 JavaScript 阻止某些关键输入,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/47229867/