mirror of
https://github.com/koreader/koreader
synced 2024-11-13 19:11:25 +00:00
fadee1f5dc
Basically: * Use `extend` for class definitions * Use `new` for object instantiations That includes some minor code cleanups along the way: * Updated `Widget`'s docs to make the semantics clearer. * Removed `should_restrict_JIT` (it's been dead code since https://github.com/koreader/android-luajit-launcher/pull/283) * Minor refactoring of LuaSettings/LuaData/LuaDefaults/DocSettings to behave (mostly, they are instantiated via `open` instead of `new`) like everything else and handle inheritance properly (i.e., DocSettings is now a proper LuaSettings subclass). * Default to `WidgetContainer` instead of `InputContainer` for stuff that doesn't actually setup key/gesture events. * Ditto for explicit `*Listener` only classes, make sure they're based on `EventListener` instead of something uselessly fancier. * Unless absolutely necessary, do not store references in class objects, ever; only values. Instead, always store references in instances, to avoid both sneaky inheritance issues, and sneaky GC pinning of stale references. * ReaderUI: Fix one such issue with its `active_widgets` array, with critical implications, as it essentially pinned *all* of ReaderUI's modules, including their reference to the `Document` instance (i.e., that was a big-ass leak). * Terminal: Make sure the shell is killed on plugin teardown. * InputText: Fix Home/End/Del physical keys to behave sensibly. * InputContainer/WidgetContainer: If necessary, compute self.dimen at paintTo time (previously, only InputContainers did, which might have had something to do with random widgets unconcerned about input using it as a baseclass instead of WidgetContainer...). * OverlapGroup: Compute self.dimen at *init* time, because for some reason it needs to do that, but do it directly in OverlapGroup instead of going through a weird WidgetContainer method that it was the sole user of. * ReaderCropping: Under no circumstances should a Document instance member (here, self.bbox) risk being `nil`ed! * Kobo: Minor code cleanups.
128 lines
3.8 KiB
Lua
128 lines
3.8 KiB
Lua
--[[--
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Widget component that handles pagination for a list of items.
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Example:
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local list_view = ListView:new{
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height = Screen:scaleBySize(400),
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width = Screen:scaleBySize(200),
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page_update_cb = function(curr_page_num, total_pages)
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-- This callback function will be called whenever a page
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-- turn event is triggered. You can use it to update
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-- information on the parent widget.
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end,
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items = {
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FrameContainer:new{
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bordersize = 0,
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background = Blitbuffer.COLOR_WHITE,
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TextWidget:new{
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text = "foo",
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face = Font:getFace("cfont"),
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}
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},
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FrameContainer:new{
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bordersize = 0,
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background = Blitbuffer.COLOR_LIGHT_GRAY,
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TextWidget:new{
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text = "bar",
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face = Font:getFace("cfont"),
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}
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},
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-- You can add as many widgets as you want here...
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}
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}
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Note that ListView is created mainly to be used as a building block for other
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widgets like @{ui.widget.networksetting|NetworkSetting}, so they can share the same pagination code.
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]]
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local BD = require("ui/bidi")
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local Blitbuffer = require("ffi/blitbuffer")
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local Device = require("device")
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local FrameContainer = require("ui/widget/container/framecontainer")
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local Geom = require("ui/geometry")
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local GestureRange = require("ui/gesturerange")
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local InputContainer = require("ui/widget/container/inputcontainer")
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local Size = require("ui/size")
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local VerticalGroup = require("ui/widget/verticalgroup")
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local ListView = InputContainer:extend{
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width = nil,
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height = nil,
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padding = nil,
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item_height = nil,
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itmes = nil,
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}
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function ListView:init()
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if #self.items <= 0 then return end
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self.show_page = 1
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self.dimen = Geom:new{x = 0, y = 0, w = self.width, h = self.height}
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if Device:isTouchDevice() then
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self.ges_events.Swipe = {
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GestureRange:new{
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ges = "swipe",
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range = self.dimen,
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}
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}
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end
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local padding = self.padding or Size.padding.large
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self.item_height = self.item_height or self.items[1]:getSize().h
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self.item_width = self.dimen.w - 2 * padding
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self.items_per_page = math.floor(self.height / self.item_height)
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self.main_content = VerticalGroup:new{}
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self:_populateItems()
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self[1] = FrameContainer:new{
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height = self.dimen.h,
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padding = padding,
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bordersize = 0,
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background = Blitbuffer.COLOR_WHITE,
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self.main_content,
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}
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end
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-- make sure self.item_height are set before calling this
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function ListView:_populateItems()
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self.pages = math.ceil(#self.items / self.items_per_page)
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self.main_content:clear()
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local idx_offset = (self.show_page - 1) * self.items_per_page
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for idx = 1, self.items_per_page do
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local item = self.items[idx_offset + idx]
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if item == nil then break end
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table.insert(self.main_content, item)
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end
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self.page_update_cb(self.show_page, self.pages)
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end
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function ListView:nextPage()
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local new_page = math.min(self.show_page+1, self.pages)
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if new_page > self.show_page then
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self.show_page = new_page
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self:_populateItems()
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end
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end
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function ListView:prevPage()
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local new_page = math.max(self.show_page-1, 1)
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if new_page < self.show_page then
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self.show_page = new_page
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self:_populateItems()
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end
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end
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function ListView:onSwipe(arg, ges_ev)
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local direction = BD.flipDirectionIfMirroredUILayout(ges_ev.direction)
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if direction == "west" then
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self:nextPage()
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return true
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elseif direction == "east" then
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self:prevPage()
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return true
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end
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end
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return ListView
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