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PDF editor: Add multi-page support

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This commit is contained in:
Raphael Michel
2022-03-13 14:10:02 +01:00
committed by Raphael Michel
parent b05fa89010
commit ebf0320c2c
5 changed files with 126 additions and 50 deletions
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119
src/pretix/static/pretixcontrol/js/ui/editor.js
View File

@@ -102,11 +102,15 @@ var editor = {
objects: [],
history: [],
clipboard: [],
pdf: null,
pdf_page: null,
pdf_page_number: 1,
pdf_page_count: 1,
pdf_scale: 1,
pdf_viewport: null,
_history_pos: 0,
_history_modification_in_progress: false,
_other_page_objects: [],
dirty: false,
pdf_url: null,
uploaded_file_id: null,
@@ -130,7 +134,7 @@ var editor = {
},
dump: function (objs) {
var d = [];
var d = !objs ? JSON.parse(JSON.stringify(editor._other_page_objects)) : [];
objs = objs || editor.fabric.getObjects();
for (var i in objs) {
@@ -149,6 +153,7 @@ var editor = {
}
d.push({
type: "textarea",
page: editor.pdf_page_number,
locale: $("#pdf-info-locale").val(),
left: editor._px2mm(left).toFixed(2),
bottom: editor._px2mm(bottom).toFixed(2),
@@ -168,6 +173,7 @@ var editor = {
} else if (o.type === "imagearea") {
d.push({
type: "imagearea",
page: editor.pdf_page_number,
left: editor._px2mm(left).toFixed(2),
bottom: editor._px2mm(editor.pdf_viewport.height - o.height * o.scaleY - top).toFixed(2),
height: editor._px2mm(o.height * o.scaleY).toFixed(2),
@@ -177,6 +183,7 @@ var editor = {
} else if (o.type === "barcodearea") {
d.push({
type: "barcodearea",
page: editor.pdf_page_number,
left: editor._px2mm(left).toFixed(2),
bottom: editor._px2mm(editor.pdf_viewport.height - o.height * o.scaleY - top).toFixed(2),
size: editor._px2mm(o.height * o.scaleY).toFixed(2),
@@ -186,6 +193,7 @@ var editor = {
} else if (o.type === "poweredby") {
d.push({
type: "poweredby",
page: editor.pdf_page_number,
left: editor._px2mm(left).toFixed(2),
bottom: editor._px2mm(editor.pdf_viewport.height - o.height * o.scaleY - top).toFixed(2),
size: editor._px2mm(o.height * o.scaleY).toFixed(2),
@@ -197,6 +205,11 @@ var editor = {
},
_add_from_data: function (d) {
var targetPage = d.page || 1;
if (targetPage !== editor.pdf_page_number) {
editor._other_page_objects.push(d);
return
}
if (d.type === "barcodearea") {
o = editor._add_qrcode();
o.content = d.content;
@@ -251,6 +264,7 @@ var editor = {
load: function(data) {
editor.fabric.clear();
editor._other_page_objects = [];
for (var i in data) {
var d = data[i], o;
editor._add_from_data(d);
@@ -268,6 +282,71 @@ var editor = {
return $('#toolbox-content option[value='+key+']').attr('data-sample') || '';
},
_load_page: function (page_number, dump) {
var previous_dump = editor._fabric_loaded ? editor.dump() : [];
// Fetch the required page
editor.pdf.getPage(page_number).then(function (page) {
console.log('Page loaded');
var canvas = document.getElementById('pdf-canvas');
var scale = editor.$cva.width() / page.getViewport(1.0).width;
var viewport = page.getViewport(scale);
// Prepare canvas using PDF page dimensions
var context = canvas.getContext('2d');
context.clearRect(0, 0, canvas.width, canvas.height);
canvas.height = viewport.height;
canvas.width = viewport.width;
editor.pdf_page = page;
editor.pdf_scale = scale;
editor.pdf_viewport = viewport;
// Render PDF page into canvas context
var renderContext = {
canvasContext: context,
viewport: viewport
};
var renderTask = page.render(renderContext);
renderTask.then(function () {
editor.pdf_page_number = page_number
editor._init_page_nav();
console.log('Page rendered');
if (dump || !editor._fabric_loaded) {
editor._init_fabric(dump);
} else {
editor.load(previous_dump);
}
});
});
},
_init_page_nav: function () {
if (editor.pdf_page_count === 1) {
$("#page_nav").hide();
} else {
$("#page_nav").html("");
for (i = 1; i <= editor.pdf_page_count; i++) {
var $li = $("<li>").addClass("nav-item");
var $a = $("<a>").text(i).attr("href", "#").attr("data-page", i).appendTo($li);
if (i === editor.pdf_page_number) {
$li.addClass("active")
}
$("#page_nav").append($li)
$a.on("click", function (event) {
console.log("switch to page", $(this).attr("data-page"));
editor.fabric.deactivateAll();
editor._load_page(parseInt($(this).attr("data-page")));
event.preventDefault();
return true;
})
}
$("#page_nav").show();
}
},
_load_pdf: function (dump) {
// TODO: Loading indicators
var url = editor.pdf_url;
@@ -279,36 +358,13 @@ var editor = {
loadingTask.promise.then(function (pdf) {
console.log('PDF loaded');
// Fetch the first page
var pageNumber = 1;
pdf.getPage(pageNumber).then(function (page) {
console.log('Page loaded');
var canvas = document.getElementById('pdf-canvas');
var scale = editor.$cva.width() / page.getViewport(1.0).width;
var viewport = page.getViewport(scale);
// Prepare canvas using PDF page dimensions
var context = canvas.getContext('2d');
context.clearRect(0, 0, canvas.width, canvas.height);
canvas.height = viewport.height;
canvas.width = viewport.width;
editor.pdf_page = page;
editor.pdf_scale = scale;
editor.pdf_viewport = viewport;
// Render PDF page into canvas context
var renderContext = {
canvasContext: context,
viewport: viewport
};
var renderTask = page.render(renderContext);
renderTask.then(function () {
console.log('Page rendered');
editor._init_fabric(dump);
});
});
editor.pdf = pdf;
editor.pdf_page_count = pdf.numPages;
if (editor.pdf_page_count > 10) {
alert('Please do not upload files with more than 10 pages for performance reasons.')
}
editor._init_page_nav();
editor._load_page(1, dump);
}, function (reason) {
var msg = gettext('The PDF background file could not be loaded for the following reason:');
editor._error(msg + ' ' + reason);
@@ -664,6 +720,7 @@ var editor = {
editor._history_modification_in_progress = true;
var objs = [];
for (var i in editor.clipboard) {
editor.clipboard[i].page = editor.pdf_page_number;
objs.push(editor._add_from_data(editor.clipboard[i]));
}
editor.fabric.discardActiveObject();

7
src/pretix/static/pretixcontrol/scss/pdfeditor.css
View File

@@ -69,3 +69,10 @@ body {
margin-top: 10px;
margin-bottom: 0;
}
.panel-pdf-editor .panel-body {
padding: 0;
}
.panel-pdf-editor .panel-body .nav-pills {
padding: 15px;
background: #eee;
}