问题描述
我正在尝试在PDFTron上添加Guidance Grid,以便用户可以轻松添加注释。稍后,如果用户正在移动注解,并且注解靠近网格线,则应将其获取到该网格线。作为第一部分,我试图绘制一个指导网格。
WebViewer({
licenseKey: '',path: './public/webviewer',css: './css/pdftron-custom.css'
},document.getElementById('pdfEditor') as HTMLElement).then(async(instance: WebViewerInstance) => {
webViewerInstance = instance;
webViewerInstance.docViewer.on('documentLoaded',async() => {
await this.loadAnnotations();
const pagesCount = docViewer.getPageCount();
let pageLoop;
let pageWidthCount;
const pageNumber = docViewer.getCurrentPage();
const pageWidth = docViewer.getPageWidth(pageNumber);
const pageHeight = docViewer.getPageHeight(pageNumber);
const instanceAnnotations = webViewerInstance.Annotations;
for (pageLoop = 1; pageLoop <= pagesCount; pageLoop++) {
for (pageWidthCount = 20; pageWidthCount < pageWidth;) {
const lineAnnot = new instanceAnnotations.LineAnnotation();
lineAnnot.PageNumber = pageLoop;
lineAnnot.setStartPoint(pageWidthCount,0);
lineAnnot.setEndPoint(pageWidthCount,pageHeight);
lineAnnot.strokeColor = new instanceAnnotations.Color(144,144,1);
lineAnnot.strokeThickness = 1;
lineAnnot.ReadOnly = true;
lineAnnot.Printable = false;
lineAnnot.Listable = false;
lineAnnot.Author = annotManager.getCurrentUser();
annotManager.addAnnotation(lineAnnot,false);
annotManager.redrawAnnotation(lineAnnot);
pageWidthCount = pageWidthCount + 20;
}
}
});
});
如您所见,我正在添加注解,还尝试在循环内绘制该注解,从而导致性能问题。所以我的问题是:
有没有一种方法可以在循环内添加注释,然后刷新文档,从而提高页面速度(或者如果您有其他方法可以这样做)?
侧面问题:如何添加虚线?
旁注-用户将无法在上述行注释上执行任何操作。它是只读的。
解决方法
您可以将注释收集到数组中,然后调用
const allAnnotations = [];
///... for loop here to collect all the annotations
annotManager.addAnnotations(allAnnotations);
annotManager.drawAnnotationsFromList(allAnnotations);