132 lines
3.9 KiB
JavaScript
132 lines
3.9 KiB
JavaScript
function Screenshot() {
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this.pasteCatcher = null;
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}
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Screenshot.prototype.execute = function() {
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this.initialize();
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};
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// Setup event listener and workarounds
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Screenshot.prototype.initialize = function() {
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this.destroy();
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if (! window.Clipboard) {
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// Create a contenteditable element
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this.pasteCatcher = document.createElement("div");
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this.pasteCatcher.id = "screenshot-pastezone";
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this.pasteCatcher.contentEditable = "true";
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// Insert the content editable at the top to avoid scrolling down in the board view
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this.pasteCatcher.style.opacity = 0;
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this.pasteCatcher.style.position = "fixed";
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this.pasteCatcher.style.top = 0;
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this.pasteCatcher.style.right = 0;
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this.pasteCatcher.style.width = 0;
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document.body.insertBefore(this.pasteCatcher, document.body.firstChild);
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// Set focus on the contenteditable element
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this.pasteCatcher.focus();
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// Set the focus when clicked anywhere in the document
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document.addEventListener("click", this.setFocus.bind(this));
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// Set the focus when clicked in screenshot dropzone (popover)
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document.getElementById("screenshot-zone").addEventListener("click", this.setFocus.bind(this));
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}
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window.addEventListener("paste", this.pasteHandler.bind(this));
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};
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// Destroy contentEditable element
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Screenshot.prototype.destroy = function() {
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if (this.pasteCatcher != null) {
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document.body.removeChild(this.pasteCatcher);
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}
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else if (document.getElementById("screenshot-pastezone")) {
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document.body.removeChild(document.getElementById("screenshot-pastezone"));
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}
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document.removeEventListener("click", this.setFocus.bind(this));
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this.pasteCatcher = null;
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};
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// Set focus on contentEditable element
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Screenshot.prototype.setFocus = function() {
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if (this.pasteCatcher !== null) {
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this.pasteCatcher.focus();
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}
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};
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// Paste event callback
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Screenshot.prototype.pasteHandler = function(e) {
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// Firefox doesn't have the property e.clipboardData.items (only Chrome)
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if (e.clipboardData && e.clipboardData.items) {
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var items = e.clipboardData.items;
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if (items) {
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for (var i = 0; i < items.length; i++) {
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// Find an image in pasted elements
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if (items[i].type.indexOf("image") !== -1) {
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var blob = items[i].getAsFile();
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// Get the image as base64 data
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var reader = new FileReader();
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var self = this;
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reader.onload = function(event) {
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self.createImage(event.target.result);
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};
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reader.readAsDataURL(blob);
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}
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}
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}
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}
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else {
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// Handle Firefox
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setTimeout(this.checkInput.bind(this), 100);
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}
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};
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// Parse the input in the paste catcher element
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Screenshot.prototype.checkInput = function() {
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var child = this.pasteCatcher.childNodes[0];
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if (child) {
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// If the user pastes an image, the src attribute
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// will represent the image as a base64 encoded string.
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if (child.tagName === "IMG") {
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this.createImage(child.src);
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}
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}
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this.pasteCatcher.innerHTML = "";
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};
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// Creates a new image from a given source
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Screenshot.prototype.createImage = function(blob) {
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var pastedImage = new Image();
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pastedImage.src = blob;
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// Send the image content to the form variable
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pastedImage.onload = function() {
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var sourceSplit = blob.split("base64,");
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var sourceString = sourceSplit[1];
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$("input[name=screenshot]").val(sourceString);
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};
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var zone = document.getElementById("screenshot-zone");
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zone.innerHTML = "";
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zone.className = "screenshot-pasted";
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zone.appendChild(pastedImage);
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this.destroy();
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this.initialize();
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};
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