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84 lines
2.8 KiB
Lua
84 lines
2.8 KiB
Lua
local InputContainer = require("ui/widget/container/inputcontainer")
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local TextBoxWidget = require("ui/widget/textboxwidget")
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local VerticalScrollBar = require("ui/widget/verticalscrollbar")
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local Geom = require("ui/geometry")
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local GestureRange = require("ui/gesturerange")
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local UIManager = require("ui/uimanager")
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local Screen = require("device").screen
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local HorizontalGroup = require("ui/widget/horizontalgroup")
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local HorizontalSpan = require("ui/widget/horizontalspan")
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local Device = require("device")
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local Blitbuffer = require("ffi/blitbuffer")
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--[[
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Text widget with vertical scroll bar
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--]]
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local ScrollTextWidget = InputContainer:new{
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text = nil,
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face = nil,
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fgcolor = Blitbuffer.COLOR_BLACK,
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width = 400,
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height = 20,
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scroll_bar_width = Screen:scaleByDPI(6),
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text_scroll_span = Screen:scaleByDPI(6),
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dialog = nil,
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}
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function ScrollTextWidget:init()
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self.text_widget = TextBoxWidget:new{
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text = self.text,
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face = self.face,
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fgcolor = self.fgcolor,
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width = self.width - self.scroll_bar_width - self.text_scroll_span,
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height = self.height
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}
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local visible_line_count = self.text_widget:getVisLineCount()
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local total_line_count = self.text_widget:getAllLineCount()
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self.v_scroll_bar = VerticalScrollBar:new{
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enable = visible_line_count < total_line_count,
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low = 0,
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high = visible_line_count/total_line_count,
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width = Screen:scaleByDPI(6),
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height = self.height,
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}
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local horizontal_group = HorizontalGroup:new{}
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table.insert(horizontal_group, self.text_widget)
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table.insert(horizontal_group, HorizontalSpan:new{width = Screen:scaleByDPI(6)})
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table.insert(horizontal_group, self.v_scroll_bar)
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self[1] = horizontal_group
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self.dimen = Geom:new(self[1]:getSize())
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if Device:isTouchDevice() then
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self.ges_events = {
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ScrollText = {
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GestureRange:new{
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ges = "swipe",
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range = function() return self.dimen end,
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},
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},
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}
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end
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end
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function ScrollTextWidget:updateScrollBar(text)
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local virtual_line_num = text:getVirtualLineNum()
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local visible_line_count = text:getVisLineCount()
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local all_line_count = text:getAllLineCount()
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self.v_scroll_bar:set(
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(virtual_line_num - 1) / all_line_count,
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(virtual_line_num - 1 + visible_line_count) / all_line_count
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)
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end
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function ScrollTextWidget:onScrollText(arg, ges)
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if ges.direction == "north" then
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self.text_widget:scrollDown()
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self:updateScrollBar(self.text_widget)
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elseif ges.direction == "south" then
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self.text_widget:scrollUp()
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self:updateScrollBar(self.text_widget)
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end
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UIManager:setDirty(self.dialog, "partial")
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end
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return ScrollTextWidget
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