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function Screenshot() {
this.pasteCatcher = null;
}
Screenshot.prototype.execute = function() {
this.initialize();
};
// Setup event listener and workarounds
Screenshot.prototype.initialize = function() {
this.destroy();
if (! window.Clipboard) {
// Create a contenteditable element
this.pasteCatcher = document.createElement("div");
this.pasteCatcher.id = "screenshot-pastezone";
this.pasteCatcher.contentEditable = "true";
// Insert the content editable at the top to avoid scrolling down in the board view
this.pasteCatcher.style.opacity = 0;
this.pasteCatcher.style.position = "fixed";
this.pasteCatcher.style.top = 0;
this.pasteCatcher.style.right = 0;
this.pasteCatcher.style.width = 0;
document.body.insertBefore(this.pasteCatcher, document.body.firstChild);
// Set focus on the contenteditable element
this.pasteCatcher.focus();
// Set the focus when clicked anywhere in the document
document.addEventListener("click", this.setFocus.bind(this));
// Set the focus when clicked in screenshot dropzone (popover)
document.getElementById("screenshot-zone").addEventListener("click", this.setFocus.bind(this));
}
window.addEventListener("paste", this.pasteHandler.bind(this));
};
// Destroy contentEditable element
Screenshot.prototype.destroy = function() {
if (this.pasteCatcher != null) {
document.body.removeChild(this.pasteCatcher);
}
else if (document.getElementById("screenshot-pastezone")) {
document.body.removeChild(document.getElementById("screenshot-pastezone"));
}
document.removeEventListener("click", this.setFocus.bind(this));
this.pasteCatcher = null;
};
// Set focus on contentEditable element
Screenshot.prototype.setFocus = function() {
if (this.pasteCatcher !== null) {
this.pasteCatcher.focus();
}
};
// Paste event callback
Screenshot.prototype.pasteHandler = function(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();
var self = this;
reader.onload = function(event) {
self.createImage(event.target.result);
};
reader.readAsDataURL(blob);
}
}
}
}
else {
// Handle Firefox
setTimeout(this.checkInput.bind(this), 100);
}
};
// Parse the input in the paste catcher element
Screenshot.prototype.checkInput = function() {
var child = this.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") {
this.createImage(child.src);
}
}
pasteCatcher.innerHTML = "";
};
// Creates a new image from a given source
Screenshot.prototype.createImage = function(blob) {
var pastedImage = new Image();
pastedImage.src = blob;
// Send the image content to the form variable
pastedImage.onload = function() {
var sourceSplit = blob.split("base64,");
var sourceString = sourceSplit[1];
$("input[name=screenshot]").val(sourceString);
};
var zone = document.getElementById("screenshot-zone");
zone.innerHTML = "";
zone.className = "screenshot-pasted";
zone.appendChild(pastedImage);
this.destroy();
this.initialize();
};
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