gitea/web_src/js/features/comp/ImagePaste.js

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import $ from 'jquery';
import {htmlEscape} from 'escape-goat';
import {POST} from '../../modules/fetch.js';
import {imageInfo} from '../../utils/image.js';
async function uploadFile(file, uploadUrl) {
const formData = new FormData();
formData.append('file', file, file.name);
const res = await POST(uploadUrl, {data: formData});
return await res.json();
}
function clipboardPastedImages(e) {
if (!e.clipboardData) return [];
const files = [];
for (const item of e.clipboardData.items || []) {
if (!item.type || !item.type.startsWith('image/')) continue;
files.push(item.getAsFile());
}
return files;
}
function triggerEditorContentChanged(target) {
target.dispatchEvent(new CustomEvent('ce-editor-content-changed', {bubbles: true}));
}
class TextareaEditor {
constructor(editor) {
this.editor = editor;
}
insertPlaceholder(value) {
const editor = this.editor;
const startPos = editor.selectionStart;
const endPos = editor.selectionEnd;
editor.value = editor.value.substring(0, startPos) + value + editor.value.substring(endPos);
editor.selectionStart = startPos;
editor.selectionEnd = startPos + value.length;
editor.focus();
triggerEditorContentChanged(editor);
}
replacePlaceholder(oldVal, newVal) {
const editor = this.editor;
const startPos = editor.selectionStart;
const endPos = editor.selectionEnd;
if (editor.value.substring(startPos, endPos) === oldVal) {
editor.value = editor.value.substring(0, startPos) + newVal + editor.value.substring(endPos);
editor.selectionEnd = startPos + newVal.length;
} else {
editor.value = editor.value.replace(oldVal, newVal);
editor.selectionEnd -= oldVal.length;
editor.selectionEnd += newVal.length;
}
editor.selectionStart = editor.selectionEnd;
editor.focus();
triggerEditorContentChanged(editor);
}
}
class CodeMirrorEditor {
constructor(editor) {
this.editor = editor;
}
insertPlaceholder(value) {
const editor = this.editor;
const startPoint = editor.getCursor('start');
const endPoint = editor.getCursor('end');
editor.replaceSelection(value);
endPoint.ch = startPoint.ch + value.length;
editor.setSelection(startPoint, endPoint);
editor.focus();
triggerEditorContentChanged(editor.getTextArea());
}
replacePlaceholder(oldVal, newVal) {
const editor = this.editor;
const endPoint = editor.getCursor('end');
if (editor.getSelection() === oldVal) {
editor.replaceSelection(newVal);
} else {
editor.setValue(editor.getValue().replace(oldVal, newVal));
}
endPoint.ch -= oldVal.length;
endPoint.ch += newVal.length;
editor.setSelection(endPoint, endPoint);
editor.focus();
triggerEditorContentChanged(editor.getTextArea());
}
}
const uploadClipboardImage = async (editor, dropzone, e) => {
const $dropzone = $(dropzone);
const uploadUrl = $dropzone.attr('data-upload-url');
const $files = $dropzone.find('.files');
if (!uploadUrl || !$files.length) return;
const pastedImages = clipboardPastedImages(e);
if (!pastedImages || pastedImages.length === 0) {
return;
}
e.preventDefault();
e.stopPropagation();
for (const img of pastedImages) {
const name = img.name.slice(0, img.name.lastIndexOf('.'));
const placeholder = `![${name}](uploading ...)`;
editor.insertPlaceholder(placeholder);
const {uuid} = await uploadFile(img, uploadUrl);
const {width, dppx} = await imageInfo(img);
const url = `/attachments/${uuid}`;
let text;
if (width > 0 && dppx > 1) {
// Scale down images from HiDPI monitors. This uses the <img> tag because it's the only
// method to change image size in Markdown that is supported by all implementations.
text = `<img width="${Math.round(width / dppx)}" alt="${htmlEscape(name)}" src="${htmlEscape(url)}">`;
} else {
text = `![${name}](${url})`;
}
editor.replacePlaceholder(placeholder, text);
const $input = $(`<input name="files" type="hidden">`).attr('id', uuid).val(uuid);
$files.append($input);
}
};
export function initEasyMDEImagePaste(easyMDE, dropzone) {
if (!dropzone) return;
easyMDE.codemirror.on('paste', async (_, e) => {
return uploadClipboardImage(new CodeMirrorEditor(easyMDE.codemirror), dropzone, e);
});
}
export function initTextareaImagePaste(textarea, dropzone) {
if (!dropzone) return;
$(textarea).on('paste', async (e) => {
return uploadClipboardImage(new TextareaEditor(textarea), dropzone, e.originalEvent);
});
}