cre: add Word Gap setting to bottom config panel (#4026)

Maps to crengine's Space Condensing feature (named Word Gap
as a similar feature is named for PDF)

frontend/apps/reader/modules/readerfont.lua

@@ -150,6 +150,10 @@ function ReaderFont:onReadSettings(config)
             or G_reader_settings:readSetting("copt_font_hinting") or 2 -- default in cre.cpp
     self.ui.document:setFontHinting(self.font_hinting)
 
+    self.space_condensing = config:readSetting("space_condensing")
+        or G_reader_settings:readSetting("copt_space_condensing") or 75
+    self.ui.document:setSpaceCondensing(self.space_condensing)
+
     self.line_space_percent = config:readSetting("line_space_percent")
             or G_reader_settings:readSetting("copt_line_spacing")
             or DCREREADER_CONFIG_LINE_SPACE_PERCENT_MEDIUM
@@ -250,6 +254,13 @@ function ReaderFont:onSetFontHinting(mode)
     return true
 end
 
+function ReaderFont:onSetSpaceCondensing(space)
+    self.space_condensing = space
+    self.ui.document:setSpaceCondensing(space)
+    self.ui:handleEvent(Event:new("UpdatePos"))
+    return true
+end
+
 function ReaderFont:onSetFontGamma(gamma)
     self.gamma_index = gamma
     self.ui.document:setGammaIndex(self.gamma_index)
@@ -268,6 +279,7 @@ function ReaderFont:onSaveSettings()
     self.ui.doc_settings:saveSetting("font_size", self.font_size)
     self.ui.doc_settings:saveSetting("font_embolden", self.font_embolden)
     self.ui.doc_settings:saveSetting("font_hinting", self.font_hinting)
+    self.ui.doc_settings:saveSetting("space_condensing", self.space_condensing)
     self.ui.doc_settings:saveSetting("line_space_percent", self.line_space_percent)
     self.ui.doc_settings:saveSetting("gamma_index", self.gamma_index)
 end

frontend/document/credocument.lua

@@ -132,13 +132,6 @@ function CreDocument:init()
             G_reader_settings:readSetting("cre_header_status_font_size"))
     end
 
-    -- min space condensing percent (how much we can decrease a space width to
-    -- make text fit on a line) default is 50%
-    if G_reader_settings:readSetting("cre_min_space_condensing_percent") then
-        self._document:setIntProperty("crengine.style.space.condensing.percent",
-            G_reader_settings:readSetting("cre_min_space_condensing_percent"))
-    end
-
     -- set fallback font face
     self._document:setStringProperty("crengine.font.fallback.face",
         G_reader_settings:readSetting("fallback_font") or self.fallback_font)
@@ -527,6 +520,13 @@ function CreDocument:setFontHinting(mode)
     self._document:setIntProperty("font.hinting.mode", mode)
 end
 
+-- min space condensing percent (how much we can decrease a space width to
+-- make text fit on a line) 25...100%
+function CreDocument:setSpaceCondensing(value)
+    logger.dbg("CreDocument: set space condensing", value)
+    self._document:setIntProperty("crengine.style.space.condensing.percent", value)
+end
+
 function CreDocument:setStyleSheet(new_css_file, appended_css_content )
     logger.dbg("CreDocument: set style sheet:",
         new_css_file and new_css_file or "no file",

frontend/ui/data/creoptions.lua

@@ -155,6 +155,19 @@ local CreOptions = {
                 args = {0, 1, 2},
                 event = "SetFontHinting",
                 name_text_hold_callback = optionsutil.showValues,
+            },
+            {
+                name = "space_condensing",
+                name_text = S.WORD_GAP,
+                toggle = {S.SMALL, S.MEDIUM, S.LARGE},
+                values = {50, 75, 100},
+                default_value = 75,
+                args = {50, 75, 100},
+                event = "SetSpaceCondensing",
+                name_text_hold_callback = optionsutil.showValues,
+                -- used by showValues
+                name_text_suffix = "%",
+                name_text_true_values = true,
             }
         }
     },

frontend/ui/widget/toggleswitch.lua

@@ -47,12 +47,13 @@ function ToggleSwitch:init()
     -- Item count per row
     self.n_pos = math.ceil(#self.toggle / self.row_count)
     self.position = nil
+    local border_size = Size.border.thin
 
     self.toggle_frame = FrameContainer:new{
         background = Blitbuffer.COLOR_WHITE,
         color = Blitbuffer.COLOR_GREY,
         radius = Size.radius.window,
-        bordersize = Size.border.thin,
+        bordersize = border_size,
         padding = Size.padding.small,
         dim = not self.enabled,
     }
@@ -63,7 +64,7 @@ function ToggleSwitch:init()
     end
 
     local center_dimen = Geom:new{
-        w = self.width / self.n_pos,
+        w = (self.width - border_size*(2*self.n_pos-2)) / self.n_pos,
         h = self.height / self.row_count,
     }
     local button_width = math.floor(self.width / self.n_pos)
@@ -88,7 +89,7 @@ function ToggleSwitch:init()
             color = Blitbuffer.COLOR_GREY,
             margin = 0,
             radius = Size.radius.window,
-            bordersize = Size.border.thin,
+            bordersize = border_size,
             padding = 0,
             content,
         }

spec/unit/readerfooter_spec.lua

@@ -146,7 +146,7 @@ describe("Readerfooter module", function()
         local timeinfo = footer.textGeneratorMap.time()
         local page_count = readerui.document:getPageCount()
         -- stats has not been initialized here, so we get na TB and TC
-        assert.are.same('1 / '..page_count..' | '..timeinfo..' | => 0 | B:0% | R:1% | TB: na | TC: na',
+        assert.are.same('1 / '..page_count..' | '..timeinfo..' | => 0 | B:0% | R:0% | TB: na | TC: na',
                         footer.footer_text.text)
     end)
 
@@ -295,8 +295,8 @@ describe("Readerfooter module", function()
         assert.are.same(365, footer.text_width)
 
         footer:onPageUpdate(100)
-        assert.are.same(183, footer.progress_bar.width)
-        assert.are.same(397, footer.text_width)
+        assert.are.same(191, footer.progress_bar.width)
+        assert.are.same(389, footer.text_width)
     end)
 
     it("should support chapter markers", function()
@@ -545,7 +545,7 @@ describe("Readerfooter module", function()
         assert.is.same(0, footer.text_width)
 
         tapFooterMenu(fake_menu, "Progress percentage")
-        assert.are.same('R:1%', footer.footer_text.text)
+        assert.are.same('R:0%', footer.footer_text.text)
         assert.is.same(false, footer.has_no_mode)
         assert.is.same(footer.footer_text:getSize().w + footer.text_left_margin,
                        footer.text_width)

spec/unit/readerlink_spec.lua

@@ -17,8 +17,8 @@ describe("ReaderLink module", function()
             document = DocumentRegistry:openDocument(sample_epub),
         }
         readerui.rolling:onGotoPage(4)
-        readerui.link:onTap(nil, {pos = {x = 336, y = 668}})
-        assert.is.same(36, readerui.rolling.current_page)
+        readerui.link:onTap(nil, {pos = {x = 306, y = 710}})
+        assert.is.same(37, readerui.rolling.current_page)
     end)
 
     it("should jump to links in pdf page mode", function()
@@ -54,8 +54,8 @@ describe("ReaderLink module", function()
             document = DocumentRegistry:openDocument(sample_epub),
         }
         readerui.rolling:onGotoPage(4)
-        readerui.link:onTap(nil, {pos = {x = 336, y = 668}})
-        assert.is.same(36, readerui.rolling.current_page)
+        readerui.link:onTap(nil, {pos = {x = 306, y = 710}})
+        assert.is.same(37, readerui.rolling.current_page)
         readerui.link:onGoBackLink()
         assert.is.same(4, readerui.rolling.current_page)
     end)

spec/unit/readertoc_spec.lua

@@ -68,7 +68,7 @@ describe("Readertoc module", function()
     end)
     it("should get page left of chapter", function()
         assert.truthy(toc:getChapterPagesLeft(10, 0) > 10)
-        assert.truthy(toc:getChapterPagesLeft(100, 0) > 10)
+        assert.truthy(toc:getChapterPagesLeft(101, 0) > 10)
         assert.are.same(nil, toc:getChapterPagesLeft(200, 0))
     end)
     it("should get page done of chapter", function()