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import {Renderer} from './Renderer';
import {throttle, debounce} from 'throttle-debounce';
import {PasteImage} from './PasteImage';
import Thenable = JQuery.Thenable;
import TextEditorPreviewPlugin = OCA.Files_Texteditor.TextEditorPreviewPlugin;
declare const aceEditor: AceAjax.Editor;
type onPopstate = (this: Window, ev: PopStateEvent) => any;
const scrollOffsetLines = 3;
export class PreviewPlugin implements TextEditorPreviewPlugin {
private renderer: Renderer;
private rangeConstructor: new (startRow: number, startColumn: number, endRow: number, endColumn: number) => AceAjax.Range;
private initPromise: Promise<void> | null = null;
private textEditorOnHashChange: onPopstate | null;
private offsetMap: number[] = [];
private session: AceAjax.IEditSession;
private previewElement: JQuery;
private scrollMode: 'editor' | 'preview' | null = null;
init() {
if (!this.initPromise) {
this.initPromise = import('./Renderer').then(({Renderer}) => {
this.renderer = new Renderer();
}, console.error.bind(console));
if (!this.textEditorOnHashChange) {
this.textEditorOnHashChange = window.onpopstate;
}
const aceRequire = window['ace']['acequire'] || window['ace'].require;
this.rangeConstructor = aceRequire("ace/range").Range;
new PasteImage().listen(this.handleImage);
}
return this.initPromise;
}
initAceHooks() {
if (this.session !== aceEditor.getSession()) {
this.session = aceEditor.getSession();
aceEditor.$blockScrolling = Infinity;
this.session.on("changeScrollTop", this.onScrollEditor);
}
}
initPreviewHooks(element) {
if (this.previewElement !== element) {
this.previewElement = element;
this.previewElement.scroll(this.onScrollPreview);
this.initCheckboxHandler(element);
}
}
onHashChange(e: PopStateEvent) {
const hash = window.location.hash.substr(1);
if (hash.substr(0, 6) !== 'editor' && this.textEditorOnHashChange) {
this.textEditorOnHashChange.call(window, e)
}
}
preview = throttle(500, (text: string, element) => {
this.initAceHooks();
this.initPreviewHooks(element);
window.onpopstate = this.onHashChange;
this.init().then(() => {
this.renderer.renderText(text, element).then(() => {
setTimeout(() => {
this.buildOffsetMap(element)
}, 500);
});
});
});
initCheckboxHandler(element) {
const Range = this.rangeConstructor;
const session = this.session;
element.on('change', 'input[type=checkbox]', function () {
const checked = this.checked;
const row = this.dataset.line;
const oldText = session.getLine(row);
const index = oldText.indexOf('[') + 1;
session.replace(new Range(row, index, row, index + 1), checked ? 'x' : ' ');
session['$wrapData'].length = session.doc.getLength();
});
}
buildOffsetMap = throttle(1000, (element) => {
const previewOffset = (element.offset() as { top: number }).top;
const offsetMap: number[] = [];
element.find('[data-line]').each(function () {
offsetMap[parseInt(this.dataset.line, 10)] = ($(this).offset() as { top: number }).top - previewOffset;
});
this.offsetMap = offsetMap;
});
onScrollEditor = throttle(100, (top: number) => {
if (this.scrollMode === 'preview') {
return;
}
this.scrollMode = 'editor';
const line = Math.max(0, Math.floor(top / 15) - scrollOffsetLines);
const previewOffset = this.offsetMap.find((offset, index) => (typeof offset !== 'undefined') && index >= line);
if (typeof previewOffset !== 'undefined') {
$('#preview').scrollTop(previewOffset);
}
this.resetScrollMode();
});
onScrollPreview = throttle(100, () => {
if (this.scrollMode === 'editor') {
return;
}
this.scrollMode = 'preview';
const top = this.previewElement.scrollTop() as number;
const previewLine = this.offsetMap.findIndex(offset => offset >= (top - 1));
if (previewLine < this.session.getLength()) {
aceEditor.scrollToLine(Math.max(previewLine - scrollOffsetLines, 0), false, true, () => {
});
}
this.resetScrollMode();
});
resetScrollMode = debounce(500, () => {
this.scrollMode = null;
});
handleImage = (image: HTMLImageElement, file) => {
OC.dialogs.prompt('Enter the name for the image', 'Upload image', (ok, name) => {
if (!ok) {
return;
}
const blob = image.src;
const cursorPos = aceEditor.getCursorPosition();
const uploadText = ``;
const finalText = ``;
this.session.insert(cursorPos, uploadText);
this.uploadImage(name, file).then(() => {
this.session.replace(
new this.rangeConstructor(cursorPos.row, cursorPos.column, cursorPos.row, cursorPos.column + uploadText.length),
finalText
);
});
}, true, 'image name');
};
uploadImage(name: string, file: File): Thenable<void> {
const path = `${this.getCurrentPath()}/${name}`.replace(/\/\/+/g, '/');
const url = OC.linkToRemote('files' + path);
const reader = new FileReader();
const deferred = $.Deferred();
reader.onloadend = (e) => {
if (reader.result) {
$.ajax({
url: url,
processData: false,
data: reader.result.toString(),
type: 'PUT',
success: deferred.resolve.bind(deferred),
error: deferred.reject.bind(deferred)
});
}
};
reader.readAsArrayBuffer(file);
return deferred.promise();
}
getCurrentPath() {
if (OCA.Files_Texteditor.file && OCA.Files_Texteditor.file.dir) {
return OCA.Files_Texteditor.file.dir;
} else if (OCA.Files.App && OCA.Files.App.fileList._currentDirectory) {
return OCA.Files.App.fileList._currentDirectory;
}
}
}
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