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