antosdk-apps/Preview/main.coffee

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# Copyright 2017-2018 Xuan Sang LE <xsang.le AT gmail DOT com>
# AnTOS Web desktop is is licensed under the GNU General Public
# License v3.0, see the LICENCE file for more information
# This program is free software: you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation, either version 3 of
# the License, or (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
# You should have received a copy of the GNU General Public License
#along with this program. If not, see https://www.gnu.org/licenses/.
class Preview extends this.OS.GUI.BaseApplication
constructor: (args) ->
super "Preview", args
main: () ->
@currfile = @args[0].path.asFileHandle() if @args and @args.length > 0
@view = @find "view"
@status = @find "status"
PDFJS.workerSrc = "#{@path()}/pdf.worker.js".asFileHandle().getlink()
@bindKey "ALT-O", () => @actionFile "#{@name}-Open"
@bindKey "CTRL-X", () => @actionFile "#{@name}-Close"
@open @currfile
open: (file) ->
return unless file
@currfile = file unless @currfile is file
file.onready().then () =>
file.info.size = (file.info.size / 1024).toFixed(2)
@renderFile file
.catch (err) =>
@error __("File not found {0}", file.path), err
renderFile: (file) ->
mime = file.info.mime
return unless mime
($ @view).empty()
if mime.match /^[^\/]+\/.*pdf.*/g
@renderPDF file
else if mime.match /image\/.*svg.*/g
@renderSVG file
else if mime.match /image\/.*/g
@renderImage file
else
@notify __("Mime type {0} is not supported", file.info.mime)
setStatus: (t) ->
($ @status).html t
renderPDF: (file) ->
status = "#{file.info.name} (#{file.info.size} Kb)"
q = @_api.mid()
file.read("binary").then (d) =>
@_api.loading q, "RENDERING"
($ @view).removeClass()
PDFJS.getDocument { data: d }
.then (pdf) =>
fn = (p) =>
if p > pdf.numPages
@setStatus "#{status} - loaded"
return @_api.loaded q, "OK"
pdf.getPage(p).then (page) =>
scale = 1.5
viewport = page.getViewport scale
div = ($ "<div/>").attr("id", "page-" + (page.pageIndex + 1))
($ @view).append div
canvas = ($ "<canvas>")[0]
div.append canvas
context = canvas.getContext '2d'
canvas.height = viewport.height
canvas.width = viewport.width
renderContext =
canvasContext: context
viewport: viewport
page.render renderContext
@setStatus "#{status} - #{p}/#{pdf.numPages} loaded"
fn(p+1)
fn(1)
.catch (err) =>
@error __("Cannot render the PDF file")
@_api.loaded q, "FAIL"
.catch (e) =>
@_api.loaded q, "FAIL"
@error __("Unable to read file: {}", file.path), e
renderSVG: (file) ->
($ @view).attr("class", "image")
file.read().then (d) =>
@view.innerHTML = d
$($(@view).children()[0])
.css "width", "100%"
.css "height", "100%"
.catch (e) => @error __("Unable to read file: {}", file.path), e
renderImage: (file) ->
($ @view).attr("class", "image")
file.read("binary").then (d) =>
img = new Image()
canvas = ($ "<canvas/>")[0]
($ @view).append canvas
#($ me.view).append img
img.onload = () =>
context = canvas.getContext '2d'
canvas.height = img.height
canvas.width = img.width
#console.log canvas.width, canvas.height
context.drawImage img, 0, 0
@setStatus "#{file.info.name} (#{file.info.size} Kb) - #{img.width}x#{img.height}"
blob = new Blob [d], { type: file.info.mime }
img.src = URL.createObjectURL blob
.catch (e) => @error __("Unable to read file: {}", file.path), e
menu: () ->
menu = [{
text: "__(File)",
child: [
{ text: "__(Open)", dataid: "#{@name}-Open", shortcut: "A-O" },
{ text: "__(Close)", dataid: "#{@name}-Close", shortcut: "C-X" },
],
onchildselect: (e) => @actionFile e.data.item.get("data").dataid
}]
menu
actionFile: (e) ->
switch e
when "#{@name}-Open"
@openDialog("FileDialog", {
title: __("Open file"),
mimes: @meta().mimes
}).then ( d ) =>
@open d.file.path.asFileHandle()
when "#{@name}-Close"
@quit()
this.OS.register "Preview", Preview