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KB.component('screenshot', function (containerElement) {
var pasteCatcher = null;
var inputElement = null;
function onFileLoaded(e) {
createImage(e.target.result);
}
function onPaste(e) {
// Firefox doesn't have the property e.clipboardData.items (only Chrome)
if (e.clipboardData && e.clipboardData.items) {
var items = e.clipboardData.items;
if (items) {
for (var i = 0; i < items.length; i++) {
// Find an image in pasted elements
if (items[i].type.indexOf("image") !== -1) {
var blob = items[i].getAsFile();
// Get the image as base64 data
var reader = new FileReader();
reader.onload = onFileLoaded;
reader.readAsDataURL(blob);
}
}
}
} else {
// Handle Firefox
setTimeout(checkInput, 100);
}
}
function initialize() {
destroy();
if (! window.Clipboard) {
// Insert the content editable at the top to avoid scrolling down in the board view
pasteCatcher = document.createElement('div');
pasteCatcher.id = 'screenshot-pastezone';
pasteCatcher.contentEditable = true;
pasteCatcher.style.opacity = 0;
pasteCatcher.style.position = 'fixed';
pasteCatcher.style.top = 0;
pasteCatcher.style.right = 0;
pasteCatcher.style.width = 0;
document.body.insertBefore(pasteCatcher, document.body.firstChild);
pasteCatcher.focus();
// Set the focus when clicked anywhere in the document
document.addEventListener('click', setFocus);
// Set the focus when clicked in screenshot dropzone
document.getElementById('screenshot-zone').addEventListener('click', setFocus);
}
window.addEventListener('paste', onPaste, false);
}
function destroy() {
if (KB.exists('#screenshot-pastezone')) {
KB.find('#screenshot-pastezone').remove();
}
document.removeEventListener('click', setFocus);
pasteCatcher = null;
}
function setFocus() {
if (pasteCatcher !== null) {
pasteCatcher.focus();
}
}
function checkInput() {
var child = pasteCatcher.childNodes[0];
if (child) {
// If the user pastes an image, the src attribute
// will represent the image as a base64 encoded string.
if (child.tagName === 'IMG') {
createImage(child.src);
}
}
pasteCatcher.innerHTML = '';
}
function createImage(blob) {
var pastedImage = new Image();
pastedImage.src = blob;
// Send the image content to the form variable
pastedImage.onload = function() {
var sourceSplit = blob.split('base64,');
inputElement.value = sourceSplit[1];
};
var zone = document.getElementById('screenshot-zone');
zone.innerHTML = '';
zone.className = 'screenshot-pasted';
zone.appendChild(pastedImage);
destroy();
initialize();
}
KB.on('modal.close', function () {
destroy();
});
this.render = function () {
inputElement = KB.dom('input')
.attr('type', 'hidden')
.attr('name', 'screenshot')
.build();
containerElement.appendChild(inputElement);
initialize();
};
});
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