VirtualKeyboard: Allow hiding the keyboard with a hold on the down arrow key (#7751)

(And showing it again with a tap on an input field)

frontend/ui/widget/inputdialog.lua

@@ -391,6 +391,7 @@ function InputDialog:init()
         scroll_callback = self._buttons_scroll_callback, -- nil if no Nav or Scroll buttons
         scroll = true,
         scroll_by_pan = self.scroll_by_pan,
+        has_nav_bar = self.add_nav_bar,
         cursor_at_end = self.cursor_at_end,
         readonly = self.readonly,
         parent = self,

frontend/ui/widget/inputtext.lua

@@ -61,6 +61,7 @@ local InputText = InputContainer:new{
     for_measurement_only = nil, -- When the widget is a one-off used to compute text height
     do_select = false, -- to start text selection
     selection_start_pos = nil, -- selection start position
+    is_keyboard_hidden = false, -- to be able to show the keyboard again when it was hidden (by VK itself)
 }
 
 -- only use PhysicalKeyboard if the device does not have touch screen
@@ -121,6 +122,11 @@ if Device:isTouchDevice() or Device:hasDPad() then
         function InputText:onTapTextBox(arg, ges)
             if self.parent.onSwitchFocus then
                 self.parent:onSwitchFocus(self)
+            else
+                if self.is_keyboard_hidden == true then
+                    self:onShowKeyboard()
+                    self.is_keyboard_hidden = false
+                end
             end
             if #self.charlist > 0 then -- Avoid cursor moving within a hint.
                 local textwidget_offset = self.margin + self.bordersize + self.padding
@@ -563,12 +569,21 @@ end
 
 function InputText:onShowKeyboard(ignore_first_hold_release)
     Device:startTextInput()
-
     self.keyboard.ignore_first_hold_release = ignore_first_hold_release
     UIManager:show(self.keyboard)
     return true
 end
 
+function InputText:onHideKeyboard()
+    if not self.has_nav_bar then
+        UIManager:close(self.keyboard)
+        Device:stopTextInput()
+        self.is_keyboard_hidden = true
+    end
+
+    return self.is_keyboard_hiddenend
+end
+
 function InputText:onCloseKeyboard()
     UIManager:close(self.keyboard)
     Device:stopTextInput()

frontend/ui/widget/virtualkeyboard.lua

@@ -111,7 +111,7 @@ function VirtualKey:init()
             self.keyboard:delToStartOfLine()
         end
         --self.skiphold = true
-    elseif self.label =="←" then
+    elseif self.label == "←" then
         self.callback = function() self.keyboard:leftChar() end
         self.hold_callback = function()
             self.ignore_key_release = true
@@ -127,6 +127,13 @@ function VirtualKey:init()
         self.callback = function() self.keyboard:upLine() end
     elseif self.label == "↓" then
         self.callback = function() self.keyboard:downLine() end
+        self.hold_callback = function()
+            self.ignore_key_release = true
+            if not self.keyboard:onHideKeyboard() then
+                -- Keyboard was *not* actually hidden: refresh the key to clear the highlight
+                self:update_keyboard(false, true)
+            end
+        end
     else
         self.callback = function () self.keyboard:addChar(self.key) end
         self.hold_callback = function()
@@ -762,6 +769,10 @@ function VirtualKeyboard:onClose()
     return true
 end
 
+function VirtualKeyboard:onHideKeyboard()
+    return self.inputbox:onHideKeyboard()
+end
+
 function VirtualKeyboard:onPressKey()
     self:getFocusItem():handleEvent(Event:new("TapSelect"))
     return true