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@ -1,5 +1,6 @@
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local Blitbuffer = require("ffi/blitbuffer")
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local Widget = require("ui/widget/widget")
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local LineWidget = require("ui/widget/linewidget")
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local RenderText = require("ui/rendertext")
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local Screen = require("device").screen
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local Geom = require("ui/geometry")
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@ -11,193 +12,134 @@ A TextWidget that handles long text wrapping
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--]]
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local TextBoxWidget = Widget:new{
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text = nil,
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charlist = nil,
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charpos = nil,
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char_width_list = nil, -- list of widths of the chars in `charlist`.
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vertical_string_list = nil,
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editable = false, -- Editable flag for whether drawing the cursor or not.
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cursor_line = nil, -- LineWidget to draw the vertical cursor.
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face = nil,
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bold = nil,
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line_height = 0.3, -- in em
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fgcolor = Blitbuffer.COLOR_BLACK,
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width = 400, -- in pixels
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height = nil,
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first_line = 1,
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virtual_line = 1, -- used by scroll bar
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line_height = 0.3, -- in em
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v_list = nil,
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height = nil, -- nil value indicates unscrollable text widget
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virtual_line_num = 1, -- used by scroll bar
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_bb = nil,
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_length = 0,
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}
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function TextBoxWidget:init()
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local v_list
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if self.height then
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v_list = self:_getCurrentVerticalList()
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else
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v_list = self:_getVerticalList()
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end
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self:_render(v_list)
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self.dimen = Geom:new(self:getSize())
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end
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function TextBoxWidget:_wrapGreedyAlg(h_list)
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local line_height = (1 + self.line_height) * self.face.size
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local cur_line_width = 0
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local cur_line = {}
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local v_list = {}
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for k,w in ipairs(h_list) do
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w.box = {
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x = cur_line_width,
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w = w.width,
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self.cursor_line = LineWidget:new{
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dimen = Geom:new{
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w = Screen:scaleBySize(1),
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h = line_height,
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}
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cur_line_width = cur_line_width + w.width
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if w.word == "\n" then
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if cur_line_width > 0 then
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-- hard line break
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table.insert(v_list, cur_line)
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cur_line = {}
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cur_line_width = 0
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end
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elseif cur_line_width > self.width then
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-- wrap to next line
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table.insert(v_list, cur_line)
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cur_line = {}
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cur_line_width = w.width
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table.insert(cur_line, w)
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else
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table.insert(cur_line, w)
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end
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}
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self:_evalCharWidthList()
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self:_splitCharWidthList()
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if self.height == nil then
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self:_renderText(1, #self.vertical_string_list)
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else
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self:_renderText(1, self:getVisLineCount())
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end
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-- handle last line
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table.insert(v_list, cur_line)
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return v_list
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if self.editable then
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local x, y
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x, y = self:_findCharPos()
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self.cursor_line:paintTo(self._bb, x, y)
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end
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self.dimen = Geom:new(self:getSize())
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end
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function TextBoxWidget:_getVerticalList(alg)
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if self.vertical_list then
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return self.vertical_list
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-- Evaluate the width of each char in `self.charlist`.
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function TextBoxWidget:_evalCharWidthList()
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if self.charlist == nil then
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self.charlist = util.splitToChars(self.text)
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self.charpos = #self.charlist + 1
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end
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-- build horizontal list
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local h_list = {}
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for line in util.gsplit(self.text, "\n", true) do
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for words in line:gmatch("[\32-\127\192-\255]+[\128-\191]*") do
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for word in util.gsplit(words, "%s+", true) do
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for w in util.gsplit(word, "%p+", true) do
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local word_box = {}
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word_box.word = w
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word_box.width = RenderText:sizeUtf8Text(0, Screen:getWidth(), self.face, w, true, self.bold).x
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table.insert(h_list, word_box)
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end
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end
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end
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if line:sub(-1) == "\n" then table.insert(h_list, {word = '\n', width = 0}) end
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self.char_width_list = {}
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for _, v in ipairs(self.charlist) do
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local w = RenderText:sizeUtf8Text(0, Screen:getWidth(), self.face, v, true, self.bold).x
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table.insert(self.char_width_list, {char = v, width = w})
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end
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-- @TODO check alg here 25.04 2012 (houqp)
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-- @TODO replace greedy algorithm with K&P algorithm 25.04 2012 (houqp)
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self.vertical_list = self:_wrapGreedyAlg(h_list)
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return self.vertical_list
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end
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function TextBoxWidget:_getCurrentVerticalList()
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local line_height = (1 + self.line_height) * self.face.size
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local v_list = self:_getVerticalList()
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local current_v_list = {}
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local height = 0
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for i = self.first_line, #v_list do
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if height < self.height - line_height then
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table.insert(current_v_list, v_list[i])
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height = height + line_height
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else
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break
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end
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end
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return current_v_list
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end
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-- Split the text into logical lines to fit into the text box.
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function TextBoxWidget:_splitCharWidthList()
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self.vertical_string_list = {}
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self.vertical_string_list[1] = {text = "Demo hint", offset = 1, width = 0} -- hint for empty string
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function TextBoxWidget:_getPreviousVerticalList()
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local line_height = (1 + self.line_height) * self.face.size
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local v_list = self:_getVerticalList()
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local previous_v_list = {}
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local height = 0
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if self.first_line == 1 then
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return self:_getCurrentVerticalList()
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end
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self.virtual_line = self.first_line
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for i = self.first_line - 1, 1, -1 do
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if height < self.height - line_height then
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table.insert(previous_v_list, 1, v_list[i])
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height = height + line_height
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self.virtual_line = self.virtual_line - 1
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else
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break
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local idx = 1
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local size = #self.char_width_list
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local ln = 1
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local offset, cur_line_width, cur_line_text
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while idx <= size do
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offset = idx
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-- Appending chars until the accumulated width exceeds `self.width`,
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-- or a newline occurs, or no more chars to consume.
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cur_line_width = 0
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local hard_newline = false
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while idx <= size do
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if self.char_width_list[idx].char == "\n" then
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hard_newline = true
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break
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end
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cur_line_width = cur_line_width + self.char_width_list[idx].width
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if cur_line_width > self.width then break else idx = idx + 1 end
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end
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end
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for i = self.first_line, #v_list do
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if height < self.height - line_height then
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table.insert(previous_v_list, v_list[i])
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height = height + line_height
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if cur_line_width <= self.width then -- a hard newline or end of string
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cur_line_text = table.concat(self.charlist, "", offset, idx - 1)
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else
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break
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end
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end
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if self.first_line > #previous_v_list then
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self.first_line = self.first_line - #previous_v_list
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else
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self.first_line = 1
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end
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return previous_v_list
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end
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function TextBoxWidget:_getNextVerticalList()
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local line_height = (1 + self.line_height) * self.face.size
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local v_list = self:_getVerticalList()
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local current_v_list = self:_getCurrentVerticalList()
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local next_v_list = {}
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local height = 0
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if self.first_line + #current_v_list > #v_list then
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return current_v_list
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end
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self.virtual_line = self.first_line
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for i = self.first_line + #current_v_list, #v_list do
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if height < self.height - line_height then
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table.insert(next_v_list, v_list[i])
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height = height + line_height
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self.virtual_line = self.virtual_line + 1
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else
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break
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-- Backtrack the string until the length fit into one line.
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local c = self.char_width_list[idx].char
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if util.isSplitable(c) then
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cur_line_text = table.concat(self.charlist, "", offset, idx - 1)
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cur_line_width = cur_line_width - self.char_width_list[idx].width
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else
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local adjusted_idx = idx
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local adjusted_width = cur_line_width
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repeat
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adjusted_width = adjusted_width - self.char_width_list[adjusted_idx].width
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adjusted_idx = adjusted_idx - 1
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c = self.char_width_list[adjusted_idx].char
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until adjusted_idx > offset and util.isSplitable(c)
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if adjusted_idx == offset then -- a very long english word ocuppying more than one line
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cur_line_text = table.concat(self.charlist, "", offset, idx - 1)
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cur_line_width = cur_line_width - self.char_width_list[idx].width
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else
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cur_line_text = table.concat(self.charlist, "", offset, adjusted_idx)
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cur_line_width = adjusted_width
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idx = adjusted_idx + 1
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end
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end -- endif util.isSplitable(c)
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end -- endif cur_line_width > self.width
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self.vertical_string_list[ln] = {text = cur_line_text, offset = offset, width = cur_line_width}
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if hard_newline then
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idx = idx + 1
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self.vertical_string_list[ln + 1] = {text = "", offset = idx, width = 0}
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end
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ln = ln + 1
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-- Make sure `idx` point to the next char to be processed in the next loop.
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end
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self.first_line = self.first_line + #current_v_list
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return next_v_list
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end
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function TextBoxWidget:_render(v_list)
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self.rendering_vlist = v_list
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function TextBoxWidget:_renderText(start_row_idx, end_row_idx)
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local font_height = self.face.size
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local line_height_px = self.line_height * font_height
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local h = (font_height + line_height_px) * #v_list
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local line_height = (1 + self.line_height) * font_height
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if start_row_idx < 1 then start_row_idx = 1 end
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if end_row_idx > #self.vertical_string_list then end_row_idx = #self.vertical_string_list end
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local row_count = end_row_idx == 0 and 1 or end_row_idx - start_row_idx + 1
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local h = line_height * row_count
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self._bb = Blitbuffer.new(self.width, h)
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self._bb:fill(Blitbuffer.COLOR_WHITE)
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local y = font_height
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local pen_x
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for _,l in ipairs(v_list) do
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if self.alignment == "center" then
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local line_len = 0
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for _,w in ipairs(l) do
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line_len = line_len + w.width
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end
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pen_x = (self.width - line_len)/2
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else
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pen_x = 0
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end
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for _,w in ipairs(l) do
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w.box.y = y - line_height_px - font_height
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for i = start_row_idx, end_row_idx do
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local line = self.vertical_string_list[i]
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local pen_x = self.alignment == "center" and (self.width - line.width)/2 or 0
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--@TODO Don't use kerning for monospaced fonts. (houqp)
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-- refert to cb25029dddc42693cc7aaefbe47e9bd3b7e1a750 in master tree
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RenderText:renderUtf8Text(self._bb, pen_x, y, self.face, w.word, true, self.bold, self.fgcolor)
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pen_x = pen_x + w.width
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end
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y = y + line_height_px + font_height
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RenderText:renderUtf8Text(self._bb, pen_x, y, self.face, line.text, true, self.bold, self.fgcolor)
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y = y + line_height
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end
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-- -- if text is shorter than one line, shrink to text's width
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-- if #v_list == 1 then
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@ -205,13 +147,52 @@ function TextBoxWidget:_render(v_list)
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-- end
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end
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function TextBoxWidget:getVirtualLineNum()
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return self.virtual_line
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-- Return the position of the cursor corresponding to `self.charpos`,
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-- Be aware of virtual line number of the scorllTextWidget.
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function TextBoxWidget:_findCharPos()
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-- Find the line number.
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local ln = self.height == nil and 1 or self.virtual_line_num
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while ln + 1 <= #self.vertical_string_list do
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if self.vertical_string_list[ln + 1].offset > self.charpos then break else ln = ln + 1 end
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end
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-- Find the offset at the current line.
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local x = 0
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local offset = self.vertical_string_list[ln].offset
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while offset < self.charpos do
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x = x + self.char_width_list[offset].width
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offset = offset + 1
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end
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local line_height = (1 + self.line_height) * self.face.size
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return x + 1, (ln - 1) * line_height -- offset `x` by 1 to avoid overlap
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end
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function TextBoxWidget:getAllLineCount()
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local v_list = self:_getVerticalList()
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return #v_list
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-- Click event: Move the cursor to a new location with (x, y), in pixels.
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-- Be aware of virtual line number of the scorllTextWidget.
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function TextBoxWidget:moveCursor(x, y)
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local w = 0
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local line_height = (1 + self.line_height) * self.face.size
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local ln = self.height == nil and 1 or self.virtual_line_num
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ln = ln + math.ceil(y / line_height) - 1
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if ln > #self.vertical_string_list then
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ln = #self.vertical_string_list
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x = self.width
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end
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local offset = self.vertical_string_list[ln].offset
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local idx = ln == #self.vertical_string_list and #self.char_width_list or self.vertical_string_list[ln + 1].offset - 1
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while offset <= idx do
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w = w + self.char_width_list[offset].width
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if w > x then break else offset = offset + 1 end
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end
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if w > x then
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local w_prev = w - self.char_width_list[offset].width
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if x - w_prev < w - x then -- the previous one is more closer
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w = w_prev
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end
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end
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self:free()
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self:_renderText(1, #self.vertical_string_list)
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self.cursor_line:paintTo(self._bb, w + 1, (ln - self.virtual_line_num) * line_height)
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return offset
|
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|
end
|
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function TextBoxWidget:getVisLineCount()
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|
@ -219,16 +200,35 @@ function TextBoxWidget:getVisLineCount()
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return math.floor(self.height / line_height)
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|
end
|
|
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|
|
function TextBoxWidget:getAllLineCount()
|
|
|
|
|
return #self.vertical_string_list
|
|
|
|
|
end
|
|
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|
-- TODO: modify `charpos` so that it can render the cursor
|
|
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|
|
function TextBoxWidget:scrollDown()
|
|
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|
|
local next_v_list = self:_getNextVerticalList()
|
|
|
|
|
self:free()
|
|
|
|
|
self:_render(next_v_list)
|
|
|
|
|
local visible_line_count = self:getVisLineCount()
|
|
|
|
|
if self.virtual_line_num + visible_line_count <= #self.vertical_string_list then
|
|
|
|
|
self:free()
|
|
|
|
|
self.virtual_line_num = self.virtual_line_num + visible_line_count
|
|
|
|
|
self:_renderText(self.virtual_line_num, self.virtual_line_num + visible_line_count - 1)
|
|
|
|
|
end
|
|
|
|
|
return (self.virtual_line_num - 1) / #self.vertical_string_list, (self.virtual_line_num - 1 + visible_line_count) / #self.vertical_string_list
|
|
|
|
|
end
|
|
|
|
|
|
|
|
|
|
-- TODO: modify `charpos` so that it can render the cursor
|
|
|
|
|
function TextBoxWidget:scrollUp()
|
|
|
|
|
local previous_v_list = self:_getPreviousVerticalList()
|
|
|
|
|
self:free()
|
|
|
|
|
self:_render(previous_v_list)
|
|
|
|
|
local visible_line_count = self:getVisLineCount()
|
|
|
|
|
if self.virtual_line_num > 1 then
|
|
|
|
|
self:free()
|
|
|
|
|
if self.virtual_line_num <= visible_line_count then
|
|
|
|
|
self.virtual_line_num = 1
|
|
|
|
|
else
|
|
|
|
|
self.virtual_line_num = self.virtual_line_num - visible_line_count
|
|
|
|
|
end
|
|
|
|
|
self:_renderText(self.virtual_line_num, self.virtual_line_num + visible_line_count - 1)
|
|
|
|
|
end
|
|
|
|
|
return (self.virtual_line_num - 1) / #self.vertical_string_list, (self.virtual_line_num - 1 + visible_line_count) / #self.vertical_string_list
|
|
|
|
|
end
|
|
|
|
|
|
|
|
|
|
function TextBoxWidget:getSize()
|
|
|
|
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|
Huang Xin
8 years ago