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koreader/frontend/ui/widget/confirmbox.lua

220 lines
6.6 KiB
Lua

--[[--
Widget that shows a confirmation alert with a message and Cancel/OK buttons
Example:
UIManager:show(ConfirmBox:new{
text = _("Save the document?"),
ok_text = _("Save"), -- ok_text defaults to _("OK")
ok_callback = function()
-- save document
end,
})
It is strongly recommended to set a custom `ok_text` describing the action to be
confirmed, as demonstrated in the example above. No ok_text should be specified
if the resulting phrase would be longer than three words.
]]
local Blitbuffer = require("ffi/blitbuffer")
local ButtonTable = require("ui/widget/buttontable")
local CenterContainer = require("ui/widget/container/centercontainer")
local Device = require("device")
local Font = require("ui/font")
local FrameContainer = require("ui/widget/container/framecontainer")
local Geom = require("ui/geometry")
local GestureRange = require("ui/gesturerange")
local HorizontalGroup = require("ui/widget/horizontalgroup")
local HorizontalSpan = require("ui/widget/horizontalspan")
local IconWidget = require("ui/widget/iconwidget")
local InputContainer = require("ui/widget/container/inputcontainer")
local MovableContainer = require("ui/widget/container/movablecontainer")
local Size = require("ui/size")
local TextBoxWidget = require("ui/widget/textboxwidget")
local UIManager = require("ui/uimanager")
local VerticalGroup = require("ui/widget/verticalgroup")
local VerticalSpan = require("ui/widget/verticalspan")
local logger = require("logger")
local _ = require("gettext")
local Screen = Device.screen
local ConfirmBox = InputContainer:new{
modal = true,
text = _("no text"),
face = Font:getFace("infofont"),
ok_text = _("OK"),
cancel_text = _("Cancel"),
ok_callback = function() end,
cancel_callback = function() end,
other_buttons = nil,
margin = Size.margin.default,
padding = Size.padding.default,
dismissable = true, -- set to false if any button callback is required
}
function ConfirmBox:init()
if self.dismissable then
if Device:isTouchDevice() then
self.ges_events.TapClose = {
GestureRange:new{
ges = "tap",
range = Geom:new{
x = 0, y = 0,
w = Screen:getWidth(),
h = Screen:getHeight(),
}
}
}
end
if Device:hasKeys() then
self.key_events = {
Close = { {"Back"}, doc = "cancel" }
}
end
end
local text_widget = TextBoxWidget:new{
text = self.text,
face = self.face,
width = math.floor(Screen:getWidth() * 2/3),
}
local content = HorizontalGroup:new{
align = "center",
IconWidget:new{
icon = "notice-question",
},
HorizontalSpan:new{ width = Size.span.horizontal_default },
text_widget,
}
local buttons = {{
text = self.cancel_text,
callback = function()
self.cancel_callback()
UIManager:close(self)
end,
}, {
text = self.ok_text,
callback = function()
self.ok_callback()
UIManager:close(self)
end,
},}
buttons = { buttons } -- single row
if self.other_buttons ~= nil then
-- additional rows
for __, buttons_row in ipairs(self.other_buttons) do
local row = {}
table.insert(buttons, row)
for ___, button in ipairs(buttons_row) do
assert(type(button.text) == "string")
assert(button.callback == nil or type(button.callback) == "function")
table.insert(row, {
text = button.text,
callback = function()
if button.callback ~= nil then
button.callback()
end
UIManager:close(self)
end,
})
end
end
end
local button_table = ButtonTable:new{
width = content:getSize().w,
button_font_face = "cfont",
button_font_size = 20,
buttons = buttons,
zero_sep = true,
show_parent = self,
}
local frame = FrameContainer:new{
background = Blitbuffer.COLOR_WHITE,
margin = self.margin,
radius = Size.radius.window,
padding = self.padding,
padding_bottom = 0, -- no padding below buttontable
VerticalGroup:new{
align = "left",
content,
-- Add same vertical space after than before content
VerticalSpan:new{ width = self.margin + self.padding },
button_table,
}
}
self.movable = MovableContainer:new{
frame,
}
self[1] = CenterContainer:new{
dimen = Screen:getSize(),
self.movable,
}
-- Reduce font size until widget fit screen height if needed
local cur_size = frame:getSize()
if cur_size and cur_size.h > 0.95 * Screen:getHeight() then
local orig_font = text_widget.face.orig_font
local orig_size = text_widget.face.orig_size
local real_size = text_widget.face.size
if orig_size > 10 then -- don't go too small
while true do
orig_size = orig_size - 1
self.face = Font:getFace(orig_font, orig_size)
-- scaleBySize() in Font:getFace() may give the same
-- real font size even if we decreased orig_size,
-- so check we really got a smaller real font size
if self.face.size < real_size then
break
end
end
-- re-init this widget
self:free()
self:init()
end
end
end
function ConfirmBox:onShow()
UIManager:setDirty(self, function()
return "ui", self[1][1].dimen
end)
end
function ConfirmBox:onCloseWidget()
UIManager:setDirty(nil, function()
return "partial", self[1][1].dimen
end)
end
function ConfirmBox:onClose()
-- Call cancel_callback, parent may expect a choice
self.cancel_callback()
UIManager:close(self)
return true
end
function ConfirmBox:onTapClose(arg, ges)
if ges.pos:notIntersectWith(self[1][1].dimen) then
self:onClose()
end
-- Don't let it propagate to underlying widgets
return true
end
function ConfirmBox:onSelect()
logger.dbg("selected:", self.selected.x)
if self.selected.x == 1 then
self:ok_callback()
else
self:cancel_callback()
end
UIManager:close(self)
return true
end
return ConfirmBox