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--- Customize how single images are displayed in the browser.
--
-- This module provides an improved version of the default WebKit image view.
-- Images are now centered within the page, and an option is provided for
-- specifying the page background color.
--
-- @module image_css
-- @copyright 2017 Aidan Holm <aidanholm@gmail.com>
local webview = require("webview")
local window = require("window")
local settings = require("settings")
local wm = require_web_module("image_css_wm")
local _M = {}
--- The background color to use when showing images.
-- @readwrite
-- @type string
_M.background = "#222"
-- Drawn from Firefox's TopLevelImageDocument.css, with some simplifications
local css_tmpl = [===[
@media not print {
body {
margin: 0;
background-color: {background} !important;
}
img {
text-align: center;
position: absolute;
margin: auto;
top: 0;
right: 0;
bottom: 0;
left: 0;
}
/* Prevent clipping the top part of the image */
img.verticalOverflow {
margin-top: 0 !important;
}
}
]===]
local css = string.gsub(css_tmpl, "{(%w+)}", { background = _M.background })
--- Stylesheet that is applied to webviews that contain only a single image.
-- @readonly
-- @type stylesheet
_M.stylesheet = stylesheet{ source = css }
webview.add_signal("init", function (view)
local top_level = {}
local uri_mime_cache = {}
view:add_signal("load-status", function (v, status)
if status == "provisional" then
top_level[v] = true
settings.override_setting_for_view(view, "webview.zoom_level", nil)
elseif status == "committed" then
top_level[v] = nil
local mime = uri_mime_cache[v.uri]
local is_image = mime and mime:match("^image/")
view.stylesheets[_M.stylesheet] = is_image
if is_image then
wm:emit_signal(view, "image")
view.zoom_level = 1.0
settings.override_setting_for_view(view, "webview.zoom_level", 100)
end
end
end)
view:add_signal("mime-type-decision", function (v, uri, mime)
if top_level[v] then
uri_mime_cache[uri] = mime
end
end)
local recalc_cb = function (v)
local w = window.ancestor(v)
if w and w.view == v then
wm:emit_signal(view, "recalc")
end
end
view:add_signal("resize", recalc_cb)
view:add_signal("switched-page", recalc_cb)
view:add_signal("property::zoom_level", recalc_cb)
end)
return _M
-- vim: et:sw=4:ts=8:sts=4:tw=80
|
