antosdk-apps/Preview/main.coffee
2020-06-05 17:45:07 +02:00

233 lines
8.2 KiB
CoffeeScript

# 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.application.BaseApplication
constructor: (args) ->
super "Preview", args
main: () ->
@currfile = undefined
@currfile = @args[0].path.asFileHandle() if @args and @args.length > 0
@view = @find "view"
@status = @find "status"
@zoom = @find "zoom"
@btnext = @find "btnext"
@btprev = @find "btprev"
@btreset = @find "btreset"
@txtpage = @find "txtpage"
@zoom.onvaluechange = (e) => @setViewScale e.data
@btreset.onbtclick = (e) =>
@zoom.value = 100
@setViewScale 100
@btnext.onbtclick = (e) =>
val = parseInt $(@txtpage).val()
return if isNaN val
$(@txtpage).val val + 1
@gotoPage()
@btprev.onbtclick = (e) =>
val = parseInt $(@txtpage).val()
return if isNaN val
$(@txtpage).val val - 1
@gotoPage()
$(@txtpage).keyup (e) =>
return unless e.which is 13
return unless @pdf
@gotoPage()
PDFJS.workerSrc = "#{@path()}/pdf.worker.js".asFileHandle().getlink()
@pdf = undefined
@img = undefined
@bindKey "ALT-O", () => @actionFile "#{@name}-Open"
@bindKey "CTRL-X", () => @actionFile "#{@name}-Close"
@zoom.max = 200
@zoom.value = 100
@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()
.catch (err) =>
@error __("File not found {0}", file.path), err
gotoPage: () ->
return unless @pdf
val = parseInt $(@txtpage).val()
return if isNaN(val)
return if val <= 0 or val > @pdf.numPages
($ @view).empty()
@renderPDFPages val, (@zoom.value / 100), false
.catch (e) => @error __("Unable to render page {0}", val), e
renderFile: () ->
mime = @currfile.info.mime
return unless mime
@pdf = undefined
@img = undefined
($ @view).empty()
@zoom.value = 100
if mime.match /^[^\/]+\/.*pdf.*/g
@renderPDF()
else if mime.match /image\/.*svg.*/g
@renderSVG()
else if mime.match /image\/.*/g
@renderImage()
else
@notify __("Mime type {0} is not supported", file.info.mime)
setStatus: (t) ->
($ @status).html t
setViewScale: (value) ->
return unless @currfile
mime = @currfile.info.mime
scale = (value / 100)
if mime.match /^[^\/]+\/.*pdf.*/g
return unless @pdf
($ @view).empty()
@load @renderPDFPages 1, scale
.catch (e) => @error __("Unable to set view scale"), e
else if mime.match /image\/.*svg.*/g
$($(@view).children()[0])
.css "width", "#{Math.round(value)}%"
.css "height", "#{Math.round(value)}%"
else if mime.match /image\/.*/g
return unless @img
canvas = $(@view).children()[0]
context = canvas.getContext '2d'
w = @img.width * scale
h = @img.height * scale
canvas.height = h
canvas.width = w
context.clearRect(0, 0, canvas.width, canvas.height)
context.scale scale, scale
context.drawImage @img, 0, 0
renderPDFPages: (n, scale, recursive) ->
new Promise (resolve, reject) =>
status = "#{@currfile.info.name} (#{@currfile.info.size} Kb)"
return resolve() if n > @pdf.numPages
@pdf.getPage(n).then (page) =>
viewport = page.getViewport scale
div = ($ "<div/>")
.attr("id", "page-" + (page.pageIndex + 1))
.attr("scale", scale)
.addClass "pdf-page"
($ @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
page._canvas = canvas
@setStatus "#{status} - page #{n}/#{@pdf.numPages} loaded"
if recursive
@renderPDFPages n + 1, scale, recursive
.then () -> resolve()
.catch (e) -> reject __e e
else
resolve()
.catch (e) -> reject __e e
renderPDF: () ->
@load new Promise (resolve, reject) =>
@currfile.read("binary").then (d) =>
($ @view).removeClass()
PDFJS.getDocument { data: d }
.then (pdf) =>
@pdf = pdf
@renderPDFPages 1, 1, false
.then () =>
$(@txtpage).val("1")
resolve()
.catch (e) -> reject __e e
.catch (e) -> reject __e e
.catch (e) -> reject __e e
.catch (e) => @error __("Unable to view file: {0}", @currfile.path), e
renderSVG: () ->
($ @view).attr("class", "image")
@currfile.read().then (d) =>
@view.innerHTML = d
$($(@view).children()[0])
.css "width", "100%"
.css "height", "100%"
.catch (e) => @error __("Unable to read file: {0}", @currfile.path), e
renderImage: () ->
($ @view).attr("class", "image")
@currfile.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
@img = img
#console.log canvas.width, canvas.height
context.drawImage img, 0, 0
@setStatus "#{@currfile.info.name} (#{@currfile.info.size} Kb) - #{img.width}x#{img.height}"
blob = new Blob [d], { type: @currfile.info.mime }
img.src = URL.createObjectURL blob
.catch (e) => @error __("Unable to read file: {0}", @currfile.path), e
menu: () ->
menu = [{
text: "__(File)",
nodes: [
{ text: "__(Open)", dataid: "#{@name}-Open", shortcut: "A-O" },
{ text: "__(Close)", dataid: "#{@name}-Close", shortcut: "C-X" },
],
onchildselect: (e) => @actionFile e.data.item.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