Create Demo_Touch_Keyboard

I needed a simple keyboard to use the GUI on a touchscreen system without keyboard. Turned out to be quite tricky and I do not think that this is the best way to do it. But in principle it works. I didn't manage to get it working with Multilines and Comboboxes though.

Maybe someone with better understanding of PySimpleGUI and tkinter can offer a more universal and elegant way...

Demo_Touch_Keyboard

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+import PySimpleGUI as sg
+
+class keyboard():
+  def __init__(self,font=('Arial',16)):
+    self.font=font
+    numberRow='1234567890'
+    topRow='QWERTYUIOP'
+    midRow='ASDFGHJKL'
+    bottomRow='ZXCVBNM'
+    keyboard_layout=[[sg.ReadButton(c, key=c, pad=(0, 0), size=(4, 2), font=self.font) for c in numberRow]+[sg.ReadButton('⌫', key='back', pad=(0, 0), size=(4, 2), font=self.font),sg.ReadButton('Esc', key='close', pad=(0, 0), size=(4, 2), font=self.font)],
+                     [sg.T(' '*4)]+[sg.ReadButton(c, key=c, pad=(0, 0), size=(4, 2), font=self.font) for c in topRow],
+                     [sg.T(' '*11)]+[sg.ReadButton(c, key=c, pad=(0, 0), size=(4, 2), font=self.font) for c in midRow],
+                     [sg.T(' '*18)]+[sg.ReadButton(c, key=c, pad=(0, 0), size=(4, 2), font=self.font) for c in bottomRow]]
+
+    self.window=sg.Window('keyboard', grab_anywhere=True, keep_on_top=True, no_titlebar=True).Layout(
+      keyboard_layout).Finalize()
+    self.hide()
+
+  def _keyboardhandler(self):
+    if self.event is not None:
+      if self.event=='close':
+        self.hide()
+      elif len(self.event)==1:
+        self.focus.Update(self.focus.Get()+self.event)
+      elif self.event=='back':
+        Text=self.focus.Get()
+        if len(Text)>0:
+          Text=Text[:-1]
+          self.focus.Update(Text)
+
+  def hide(self):
+    self.visible=False
+    self.window.Disappear()
+
+  def show(self):
+    self.visible=True
+    self.window.Reappear()
+
+  def togglevis(self):
+    if self.visible:
+      self.hide()
+    else:
+      self.show()
+
+  def update(self,focus):
+    self.event,_=self.window.ReadNonBlocking()
+    self.focus=focus
+    self._keyboardhandler()
+
+  def close(self):
+    self.window.CloseNonBlocking()
+
+
+class GUI():
+  def __init__(self):
+    layout = [[sg.Text('Enter Text')],
+          [sg.Input(size=(17, 1), key='input1',)],
+          [sg.InputText(size=(17, 1), key='input2')],
+          [sg.ReadButton('on-screen keyboard',key='keyboard')],
+          [sg.ReadButton('close',key='close')]]
+
+    self.mainWindow = sg.Window('On-screen test', grab_anywhere=False,no_titlebar=True).Layout(layout)
+    self.keyboard=keyboard()
+    self.focus=None
+
+
+  def run(self):
+    while True:
+      for row in self.mainWindow.Rows:
+        for element in row:
+          if element.Type=='input' and element.TKEntry is not None and element.TKEntry is element.TKEntry.focus_get():
+            self.focus=element
+      event, values=self.mainWindow.ReadNonBlocking()
+      self.keyboard.update(self.focus)
+      if event=='keyboard':
+        self.keyboard.togglevis()
+      elif event=='close':
+        break
+    self.keyboard.close()
+    self.mainWindow.CloseNonBlocking()
+
+if __name__ == '__main__':
+  app=GUI()
+  app.run()