move reader code into frontend/apps/reader

it makes more sense to completely separate the UI framework and
application code

also move frontend/ui/configurable.lua to frontend/configurable.lua

frontend/apps/reader/modules/readerlink.lua

@@ -0,0 +1,106 @@
+local InputContainer = require("ui/widget/container/inputcontainer")
+local GestureRange = require("ui/gesturerange")
+local Geom = require("ui/geometry")
+local Screen = require("ui/screen")
+local Device = require("ui/device")
+local Event = require("ui/event")
+local DEBUG = require("dbg")
+
+local ReaderLink = InputContainer:new{
+    link_states = {}
+}
+
+function ReaderLink:init()
+    if Device:isTouchDevice() then
+        self:initGesListener()
+    end
+end
+
+function ReaderLink:onReadSettings(config)
+    -- called when loading new document
+    self.link_states = {}
+end
+
+function ReaderLink:initGesListener()
+    if Device:isTouchDevice() then
+        self.ges_events = {
+            Tap = {
+                GestureRange:new{
+                    ges = "tap",
+                    range = Geom:new{
+                        x = 0, y = 0,
+                        w = Screen:getWidth(),
+                        h = Screen:getHeight()
+                    }
+                }
+            },
+            Swipe = {
+                GestureRange:new{
+                    ges = "swipe",
+                    range = Geom:new{
+                        x = 0, y = 0,
+                        w = Screen:getWidth(),
+                        h = Screen:getHeight(),
+                    }
+                }
+            },
+        }
+    end
+end
+
+function ReaderLink:onSetDimensions(dimen)
+    -- update listening according to new screen dimen
+    if Device:isTouchDevice() then
+        self:initGesListener()
+    end
+end
+
+function ReaderLink:onTap(arg, ges)
+    if self.ui.document.info.has_pages then
+        local pos = self.view:screenToPageTransform(ges.pos)
+        if pos then
+            local link = self.ui.document:getLinkFromPosition(pos.page, pos)
+            if link then
+                return self:onGotoLink(link)
+            end
+        end
+    else
+        local link = self.ui.document:getLinkFromPosition(ges.pos)
+        if link ~= "" then
+            return self:onGotoLink(link)
+        end
+    end
+end
+
+function ReaderLink:onGotoLink(link)
+    if self.ui.document.info.has_pages then
+        table.insert(self.link_states, self.view.state.page)
+        self.ui:handleEvent(Event:new("PageUpdate", link.page + 1))
+    else
+        table.insert(self.link_states, self.ui.document:getXPointer())
+        self.document:gotoLink(link)
+        self.ui:handleEvent(Event:new("UpdateXPointer"))
+    end
+    return true
+end
+
+function ReaderLink:onSwipe(arg, ges)
+    if ges.direction == "east" then
+        if self.ui.document.info.has_pages then
+            local last_page = table.remove(self.link_states)
+            if last_page then
+                self.ui:handleEvent(Event:new("PageUpdate", last_page))
+                return true
+            end
+        else
+            local last_xp = table.remove(self.link_states)
+            if last_xp then
+                self.ui.document:gotoXPointer(last_xp)
+                self.ui:handleEvent(Event:new("UpdateXPointer"))
+                return true
+            end
+        end
+    end
+end
+
+return ReaderLink