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koreader/frontend/ui/reader/readerzooming.lua

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Lua
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ReaderZooming = InputContainer:new{
key_events = {
ZoomIn = { { "Shift", Input.group.PgFwd }, doc = "zoom in", event = "Zoom", args = "in" },
ZoomOut = { { "Shift", Input.group.PgBack }, doc = "zoom out", event = "Zoom", args = "out" },
ZoomToFitPage = { {"A"}, doc = "zoom to fit page", event = "SetZoomMode", args = "page" },
ZoomToFitContent = { {"Shift", "A"}, doc = "zoom to fit content", event = "SetZoomMode", args = "content" },
ZoomToFitPageWidth = { {"S"}, doc = "zoom to fit page width", event = "SetZoomMode", args = "pagewidth" },
ZoomToFitContentWidth = { {"Shift", "S"}, doc = "zoom to fit content width", event = "SetZoomMode", args = "contentwidth" },
ZoomToFitPageHeight = { {"D"}, doc = "zoom to fit page height", event = "SetZoomMode", args = "pageheight" },
ZoomToFitContentHeight = { {"Shift", "D"}, doc = "zoom to fit content height", event = "SetZoomMode", args = "contentheight" },
},
zoom = 1.0,
zoom_mode = "free",
current_page = 1,
rotation = 0
}
function ReaderZooming:onSetDimensions(dimensions)
-- we were resized
self.dimen = dimensions
end
function ReaderZooming:onRotationUpdate(rotation)
self.rotation = rotation
self:setZoom()
end
function ReaderZooming:setZoom()
-- nothing to do in free zoom mode
if self.zoom_mode == "free" then
return
end
-- check if we're in bbox mode and work on bbox if that's the case
local page_size = {}
if self.zoom_mode == "content" or self.zoom_mode == "contentwidth" or self.zoom_mode == "content_height" then
-- TODO: enable this, still incomplete
page_size = self.ui.document:getUsedBBox(self.current_page)
self.view:handleEvent(Event:new("BBoxUpdate", page_size))
else
-- otherwise, operate on full page
page_size = self.ui.document:getNativePageDimensions(self.current_page)
end
-- calculate zoom value:
local zoom_w = self.dimen.w / page_size.w
local zoom_h = self.dimen.h / page_size.h
if self.rotation % 180 ~= 0 then
-- rotated by 90 or 270 degrees
zoom_w = self.dimen.w / page_size.h
zoom_h = self.dimen.h / page_size.w
end
if self.zoom_mode == "content" or self.zoom_mode == "page" then
if zoom_w < zoom_h then
self.zoom = zoom_w
else
self.zoom = zoom_h
end
elseif self.zoom_mode == "contentwidth" or self.zoom_mode == "pagewidth" then
self.zoom = zoom_w
elseif self.zoom_mode == "contentheight" or self.zoom_mode == "pageheight" then
self.zoom = zoom_h
end
self.view:ZoomUpdate(self.zoom)
end
function ReaderZooming:onZoom(direction)
DEBUG("zoom", direction)
if direction == "in" then
self.zoom = self.zoom * 1.333333
elseif direction == "out" then
self.zoom = self.zoom * 0.75
end
DEBUG("zoom is now at", self.zoom)
self:onSetZoomMode("free")
self.view:ZoomUpdate(self.zoom)
return true
end
function ReaderZooming:onSetZoomMode(what)
if self.zoom_mode ~= what then
DEBUG("setting zoom mode to", what)
self.zoom_mode = what
self:setZoom()
end
return true
end
function ReaderZooming:onPageUpdate(new_page_no)
self.current_page = new_page_no
self:setZoom()
end