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Merge pull request #4995 from wiktor-obrebski/widgets/text-area
Widgets/text area
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,183 @@ | ||
| -- Multiline text area control | ||
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| local Panel = require('gui.widgets.containers.panel') | ||
| local Scrollbar = require('gui.widgets.scrollbar') | ||
| local TextAreaContent = require('gui.widgets.text_area.text_area_content') | ||
| local HistoryStore = require('gui.widgets.text_area.history_store') | ||
|
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| local HISTORY_ENTRY = HistoryStore.HISTORY_ENTRY | ||
|
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| TextArea = defclass(TextArea, Panel) | ||
|
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| TextArea.ATTRS{ | ||
| init_text = '', | ||
| init_cursor = DEFAULT_NIL, | ||
| text_pen = COLOR_LIGHTCYAN, | ||
| ignore_keys = {}, | ||
| select_pen = COLOR_CYAN, | ||
| on_text_change = DEFAULT_NIL, | ||
| on_cursor_change = DEFAULT_NIL, | ||
| one_line_mode = false, | ||
| debug = false | ||
| } | ||
|
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| function TextArea:init() | ||
| self.render_start_line_y = 1 | ||
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| self.text_area = TextAreaContent{ | ||
| frame={l=0,r=3,t=0}, | ||
| text=self.init_text, | ||
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| text_pen=self.text_pen, | ||
| ignore_keys=self.ignore_keys, | ||
| select_pen=self.select_pen, | ||
| debug=self.debug, | ||
| one_line_mode=self.one_line_mode, | ||
|
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| on_text_change=function (text, old_text) | ||
| self:updateLayout() | ||
| if self.on_text_change then | ||
| self.on_text_change(text, old_text) | ||
| end | ||
| end, | ||
| on_cursor_change=self:callback('onCursorChange') | ||
| } | ||
| self.scrollbar = Scrollbar{ | ||
| frame={r=0,t=1}, | ||
| on_scroll=self:callback('onScrollbar'), | ||
| visible=not self.one_line_mode | ||
| } | ||
|
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| self:addviews{ | ||
| self.text_area, | ||
| self.scrollbar, | ||
| } | ||
| end | ||
|
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| function TextArea:getText() | ||
| return self.text_area.text | ||
| end | ||
|
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| function TextArea:setText(text) | ||
| self.text_area.history:store( | ||
| HISTORY_ENTRY.OTHER, | ||
| self:getText(), | ||
| self:getCursor() | ||
| ) | ||
|
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| return self.text_area:setText(text) | ||
| end | ||
|
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| function TextArea:getCursor() | ||
| return self.text_area.cursor | ||
| end | ||
|
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| function TextArea:setCursor(cursor_offset) | ||
| return self.text_area:setCursor(cursor_offset) | ||
| end | ||
|
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| function TextArea:clearHistory() | ||
| return self.text_area.history:clear() | ||
| end | ||
|
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| function TextArea:onCursorChange(cursor, old_cursor) | ||
| local x, y = self.text_area.wrapped_text:indexToCoords( | ||
| self.text_area.cursor | ||
| ) | ||
|
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||
| if y >= self.render_start_line_y + self.text_area.frame_body.height then | ||
| self:updateScrollbar( | ||
| y - self.text_area.frame_body.height + 1 | ||
| ) | ||
| elseif (y < self.render_start_line_y) then | ||
| self:updateScrollbar(y) | ||
| end | ||
|
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||
| if self.on_cursor_change then | ||
| self.on_cursor_change(cursor, old_cursor) | ||
| end | ||
| end | ||
|
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| function TextArea:scrollToCursor(cursor_offset) | ||
| if self.scrollbar.visible then | ||
| local _, cursor_line_y = self.text_area.wrapped_text:indexToCoords( | ||
| cursor_offset | ||
| ) | ||
| self:updateScrollbar(cursor_line_y) | ||
| end | ||
| end | ||
|
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||
| function TextArea:getPreferredFocusState() | ||
| return true | ||
| end | ||
|
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| function TextArea:postUpdateLayout() | ||
| self:updateScrollbar(self.render_start_line_y) | ||
|
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| if self.text_area.cursor == nil then | ||
| local cursor = self.init_cursor or #self.init_text + 1 | ||
| self.text_area:setCursor(cursor) | ||
| self:scrollToCursor(cursor) | ||
| end | ||
| end | ||
|
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| function TextArea:onScrollbar(scroll_spec) | ||
| local height = self.text_area.frame_body.height | ||
|
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| local render_start_line = self.render_start_line_y | ||
| if scroll_spec == 'down_large' then | ||
| render_start_line = render_start_line + math.ceil(height / 2) | ||
| elseif scroll_spec == 'up_large' then | ||
| render_start_line = render_start_line - math.ceil(height / 2) | ||
| elseif scroll_spec == 'down_small' then | ||
| render_start_line = render_start_line + 1 | ||
| elseif scroll_spec == 'up_small' then | ||
| render_start_line = render_start_line - 1 | ||
| else | ||
| render_start_line = tonumber(scroll_spec) | ||
| end | ||
|
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| self:updateScrollbar(render_start_line) | ||
| end | ||
|
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| function TextArea:updateScrollbar(scrollbar_current_y) | ||
| local lines_count = #self.text_area.wrapped_text.lines | ||
|
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| local render_start_line_y = math.min( | ||
| #self.text_area.wrapped_text.lines - self.text_area.frame_body.height + 1, | ||
| math.max(1, scrollbar_current_y) | ||
| ) | ||
|
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| self.scrollbar:update( | ||
| render_start_line_y, | ||
| self.frame_body.height, | ||
| lines_count | ||
| ) | ||
|
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| if (self.frame_body.height >= lines_count) then | ||
| render_start_line_y = 1 | ||
| end | ||
|
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| self.render_start_line_y = render_start_line_y | ||
| self.text_area:setRenderStartLineY(self.render_start_line_y) | ||
| end | ||
|
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| function TextArea:renderSubviews(dc) | ||
| self.text_area.frame_body.y1 = self.frame_body.y1-(self.render_start_line_y - 1) | ||
| -- only visible lines of text_area will be rendered | ||
| TextArea.super.renderSubviews(self, dc) | ||
| end | ||
|
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| function TextArea:onInput(keys) | ||
| if (self.scrollbar.is_dragging) then | ||
| return self.scrollbar:onInput(keys) | ||
| end | ||
|
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| if keys._MOUSE_L and self:getMousePos() then | ||
| self:setFocus(true) | ||
| end | ||
|
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| return TextArea.super.onInput(self, keys) | ||
| end | ||
|
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| return TextArea |
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