[UX] SDL2: set window title (#3784)

This initial implementation only sets the title for FileManager and ReaderUI.

Fixes #3713.

base

@@ -1 +1 @@
-Subproject commit 441221ec9ac52863dba9485a657c4694b3c593f8
+Subproject commit 3fed4dfae7f1494ee249da424c9251c06f48c770

frontend/apps/reader/readerui.lua

@@ -46,6 +46,7 @@ local Screenshoter = require("ui/widget/screenshoter")
 local UIManager = require("ui/uimanager")
 local lfs = require("libs/libkoreader-lfs")
 local logger = require("logger")
+local util = require("util")
 local _ = require("gettext")
 local Screen = require("device").screen
 local T = require("ffi/util").template
@@ -187,7 +188,7 @@ function ReaderUI:init()
             ui = self
         })
     end
-    -- configuable controller
+    -- configurable controller
     if self.document.info.configurable then
         -- config panel controller
         self:registerModule("config", ReaderConfig:new{
@@ -470,6 +471,16 @@ function ReaderUI:doShowReader(file, provider)
         covers_fullscreen = true, -- hint for UIManager:_repaint()
         document = document,
     }
+
+    local title = reader.document:getProps().title
+
+    if title ~= "" then
+        Screen:setWindowTitle(title)
+    else
+        local _, filename = util.splitFilePathName(file)
+        Screen:setWindowTitle(filename)
+    end
+
     UIManager:show(reader)
     _running_instance = reader
 end

frontend/ui/widget/filechooser.lua

@@ -261,6 +261,10 @@ end
 
 function FileChooser:refreshPath()
     local itemmatch = nil
+
+    local _, folder_name = require("util").splitFilePathName(self.path)
+    Screen:setWindowTitle(folder_name)
+
     if self.focused_path then
         itemmatch = {path = self.focused_path}
         -- We use focused_path only once, but remember it
@@ -268,15 +272,18 @@ function FileChooser:refreshPath()
         self.prev_focused_path = self.focused_path
         self.focused_path = nil
     end
+
     self:switchItemTable(nil, self:genItemTableFromPath(self.path), self.path_items[self.path], itemmatch)
 end
 
 function FileChooser:changeToPath(path, focused_path)
     path = util.realpath(path)
     self.path = path
+
     if focused_path then
         self.focused_path = focused_path
     end
+
     self:refreshPath()
     self:onPathChanged(path)
 end