forgejo/web_src/js/features/comp/ImagePaste.js
yp05327 c4303efc23
Support markdown editor for issue template (#24400)
Fixes #24398

Task:
- [x] Reusing "textarea" like GitHub seems more friendly to users.
- [x] ^V image pasting and file uploading handling.

<details><summary>screenshots</summary>


![image](https://user-images.githubusercontent.com/18380374/235418877-00090552-ebda-411c-8e39-b47246bc8746.png)

![image](https://user-images.githubusercontent.com/18380374/235419073-dc33cad7-7626-4bce-9161-eb205c7384b5.png)
Display only one markdown editor:

![image](https://user-images.githubusercontent.com/18380374/235419098-ee21386d-2b2d-432e-bdb2-18646cc031e7.png)
Support file upload and ^V image pasting

![image](https://user-images.githubusercontent.com/18380374/235419364-7b390fa4-da56-437d-b55e-3847fbc049e7.png)

</details>

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: silverwind <me@silverwind.io>
2023-05-08 22:22:52 +00:00

138 lines
4 KiB
JavaScript

import $ from 'jquery';
const {csrfToken} = window.config;
async function uploadFile(file, uploadUrl) {
const formData = new FormData();
formData.append('file', file, file.name);
const res = await fetch(uploadUrl, {
method: 'POST',
headers: {'X-Csrf-Token': csrfToken},
body: 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 = `![${name}](uploading ...)`;
editor.insertPlaceholder(placeholder);
const data = await uploadFile(img, uploadUrl);
editor.replacePlaceholder(placeholder, `![${name}](/attachments/${data.uuid})`);
const $input = $(`<input name="files" type="hidden">`).attr('id', data.uuid).val(data.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);
});
}