mirror of
https://github.com/koreader/koreader
synced 2024-11-10 01:10:34 +00:00
2011cf1ad1
* Fix the "Enable debug logging" checkbox so that it properly disables "Enable verbose debug logging" when it gets disabled * Avoid asking ImageWidget for alpha-blending when it's not useful * Make ImageWidget's alpha-blending code-path double-check that alpha-blending actually is needed, and avoid it if possible * In the same vein, only do alpha-blending in textboxwidget when absolutely necessary * Prefer color constants over the gray() method, ensuring that they're part of the eInk palette Depends on https://github.com/koreader/koreader-base/pull/853 Fix #4774
126 lines
3.7 KiB
Lua
126 lines
3.7 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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fact = 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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fact = 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 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:new{
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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{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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if ges_ev.direction == "west" then
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self:nextPage()
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return true
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elseif ges_ev.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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