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248 lines
10 KiB
Lua
248 lines
10 KiB
Lua
local Blitbuffer = require("ffi/blitbuffer")
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local Button = require("ui/widget/button")
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local Device = require("device")
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local FocusManager = require("ui/widget/focusmanager")
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local HorizontalGroup = require("ui/widget/horizontalgroup")
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local LineWidget = require("ui/widget/linewidget")
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local Size = require("ui/size")
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local VerticalGroup = require("ui/widget/verticalgroup")
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local VerticalSpan = require("ui/widget/verticalspan")
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local Geom = require("ui/geometry")
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local Screen = Device.screen
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local ButtonTable = FocusManager:extend{
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width = nil,
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-- If requested, allow ButtonTable to shrink itself if 'width' can
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-- be reduced without any truncation or font size getting smaller.
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shrink_unneeded_width = false,
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-- But we won't go below this: buttons are tapable, we want some
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-- minimal width so they are easy to tap (this is mostly needed
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-- for CJK languages where button text can be one or two glyphs).
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shrink_min_width = Screen:scaleBySize(100),
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buttons = {
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{
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{text="OK", enabled=true, callback=nil},
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{text="Cancel", enabled=false, callback=nil},
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},
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},
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sep_width = Size.line.medium,
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zero_sep = false,
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}
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function ButtonTable:init()
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self.width = self.width or math.floor(math.min(Screen:getWidth(), Screen:getHeight()) * 0.9)
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self.buttons_layout = {}
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self.button_by_id = {}
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self.container = VerticalGroup:new{ width = self.width }
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self[1] = self.container
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if self.zero_sep then
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-- If we're asked to add a first line, don't add a vspan before: caller
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-- must do its own padding before.
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self:addVerticalSeparator()
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end
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local row_cnt = #self.buttons
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local table_min_needed_width = -1
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for i = 1, row_cnt do
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self:addVerticalSpan()
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local buttons_layout_line = {}
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local horizontal_group = HorizontalGroup:new{}
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local row = self.buttons[i]
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local column_cnt = #row
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local available_width = self.width - self.sep_width * (column_cnt - 1)
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local unspecified_width_buttons = 0
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for j = 1, column_cnt do
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local btn_entry = row[j]
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if btn_entry.width then
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available_width = available_width - btn_entry.width
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else
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unspecified_width_buttons = unspecified_width_buttons + 1
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end
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end
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local default_button_width = math.floor(available_width / unspecified_width_buttons)
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local min_needed_button_width = -1
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for j = 1, column_cnt do
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local btn_entry = row[j]
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local button = Button:new{
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text = btn_entry.text,
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text_func = btn_entry.text_func,
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checked_func = btn_entry.checked_func,
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lang = btn_entry.lang,
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icon = btn_entry.icon,
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icon_width = btn_entry.icon_width,
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icon_height = btn_entry.icon_height,
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align = btn_entry.align,
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enabled = btn_entry.enabled,
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enabled_func = btn_entry.enabled_func,
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callback = function()
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if self.show_parent and self.show_parent.movable then
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self.show_parent.movable:resetEventState()
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end
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btn_entry.callback()
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end,
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hold_callback = btn_entry.hold_callback,
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allow_hold_when_disabled = btn_entry.allow_hold_when_disabled,
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vsync = btn_entry.vsync,
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width = btn_entry.width or default_button_width,
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bordersize = 0,
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margin = 0,
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padding = Size.padding.buttontable, -- a bit taller than standalone buttons, for easier tap
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padding_h = btn_entry.align == "left" and Size.padding.large or Size.padding.button,
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-- allow text to take more of the horizontal space if centered
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avoid_text_truncation = btn_entry.avoid_text_truncation,
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text_font_face = btn_entry.font_face,
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text_font_size = btn_entry.font_size,
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text_font_bold = btn_entry.font_bold,
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show_parent = self.show_parent,
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}
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if self.shrink_unneeded_width and not btn_entry.width and min_needed_button_width ~= false then
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-- We gather the largest min width of all buttons without a specified width,
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-- and will see how it does when this largest min width is applied to all
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-- buttons (without a specified width): we still want to keep them the same
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-- size and balanced.
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local min_width = button:getMinNeededWidth()
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if min_width then
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if min_needed_button_width < min_width then
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min_needed_button_width = min_width
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end
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else
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-- If any one button in this row can't be made smaller, give up
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min_needed_button_width = false
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end
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end
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if btn_entry.id then
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self.button_by_id[btn_entry.id] = button
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end
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local button_dim = button:getSize()
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local vertical_sep = LineWidget:new{
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background = Blitbuffer.COLOR_GRAY,
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dimen = Geom:new{
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w = self.sep_width,
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h = button_dim.h,
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}
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}
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buttons_layout_line[j] = button
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table.insert(horizontal_group, button)
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if j < column_cnt then
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table.insert(horizontal_group, vertical_sep)
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end
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end -- end for each button
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table.insert(self.container, horizontal_group)
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self:addVerticalSpan()
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if i < row_cnt then
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self:addVerticalSeparator()
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end
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if column_cnt > 0 then
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-- Only add lines that are not separator to the focusmanager
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table.insert(self.buttons_layout, buttons_layout_line)
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end
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if self.shrink_unneeded_width and table_min_needed_width ~= false then
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if min_needed_button_width then
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if min_needed_button_width >= 0 and min_needed_button_width < default_button_width then
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local row_min_width = self.width - (default_button_width - min_needed_button_width)*unspecified_width_buttons
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if table_min_needed_width < row_min_width then
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table_min_needed_width = row_min_width
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end
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end
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else
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-- If any one row can't be made smaller, give up
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table_min_needed_width = false
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end
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end
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end -- end for each button line
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if Device:hasDPad() then
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self.layout = self.buttons_layout
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self:refocusWidget()
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else
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self.key_events = {} -- deregister all key press event listeners
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end
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if self.shrink_unneeded_width and table_min_needed_width ~= false
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and table_min_needed_width > 0 and table_min_needed_width < self.width then
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self.width = table_min_needed_width > self.shrink_min_width and table_min_needed_width or self.shrink_min_width
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self.shrink_unneeded_width = false
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self:free()
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self:init()
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end
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end
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function ButtonTable:addVerticalSpan()
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table.insert(self.container, VerticalSpan:new{
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width = Size.span.vertical_default,
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})
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end
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function ButtonTable:addVerticalSeparator(black_line)
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table.insert(self.container, LineWidget:new{
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background = black_line and Blitbuffer.COLOR_BLACK or Blitbuffer.COLOR_GRAY,
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dimen = Geom:new{
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w = self.width,
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h = self.sep_width,
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},
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})
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end
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function ButtonTable:setupGridScrollBehaviour()
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-- So that the last row get the same height as all others,
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-- we add an invisible separator below it
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self.container:resetLayout()
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table.insert(self.container, VerticalSpan:new{
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width = self.sep_width,
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})
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self.container:getSize() -- have it recompute its offsets and size
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-- Generate self.step_scroll_grid (so that what we add next is not part of it)
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self:getStepScrollGrid()
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-- Insert 2 lines off-dimensions in VerticalGroup (that will show only when overflowing)
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table.insert(self.container, 1, LineWidget:new{
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background = Blitbuffer.COLOR_BLACK,
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dimen = Geom:new{
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w = self.width,
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h = self.sep_width,
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},
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})
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table.insert(self.container._offsets, 1, { x=self.width, y=-self.sep_width })
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table.insert(self.container, LineWidget:new{
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background = Blitbuffer.COLOR_BLACK,
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dimen = Geom:new{
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w = self.width,
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h = self.sep_width,
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},
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})
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table.insert(self.container._offsets, { x=self.width, y=self.container._size.h + self.sep_width })
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end
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function ButtonTable:getStepScrollGrid()
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if not self.step_scroll_grid then
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local step_rows = {}
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local offsets = self.container._offsets
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local idx = self.zero_sep and 2 or 1
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local row_num = 1
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while idx <= #self.container do
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local row = {
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row_num = row_num, -- (not used, but may help with debugging)
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top = offsets[idx].y, -- top of our vspan above text
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content_top = offsets[idx+1].y, -- top of our text widget
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content_bottom = offsets[idx+2].y - 1, -- bottom of our text widget
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bottom = idx+4 <= #self.container and offsets[idx+4].y -1 or self.container:getSize().h -1
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-- bottom of our vspan + separator below text
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-- To implement when needed:
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-- columns = { array of similar info about each button in that row's HorizontalGroup }
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-- Its absence means free scrolling on the x-axis (if scroll ends up being needed)
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}
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table.insert(step_rows, row)
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idx = idx + 4
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row_num = row_num + 1
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end
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self.step_scroll_grid = step_rows
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end
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return self.step_scroll_grid
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end
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function ButtonTable:getButtonById(id)
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return self.button_by_id[id] -- nil if not found
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end
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return ButtonTable
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