virtual keyboard plugin

gui/gui_classic.py

@@ -1486,6 +1486,7 @@ class ElectrumWindow(QMainWindow):
         vbox.addLayout(ok_cancel_buttons(d))
         d.setLayout(vbox)
 
+        self.run_hook('password_dialog', pw, grid, 1)
         if not d.exec_(): return
         return unicode(pw.text())
 

plugins/virtualkeyboard.py

@@ -0,0 +1,65 @@
+from PyQt4.QtGui import *
+from electrum_gui import BasePlugin
+from electrum_gui.i18n import _
+
+class Plugin(BasePlugin):
+
+
+    def __init__(self, gui):
+        BasePlugin.__init__(self, gui, 'virtualkeyboard', 'Virtual Keyboard',
+                            _("Add an optional, mouse keyboard to the password dialog.\nWarning: do not use this if it makes you pick a weaker password."))
+        self.vkb = None
+        self.vkb_index = 0
+
+
+    def password_dialog(self, pw, grid, pos):
+        vkb_button = QPushButton(_("+"))
+        vkb_button.setFixedWidth(20)
+        vkb_button.clicked.connect(lambda: self.toggle_vkb(grid, pw))
+        grid.addWidget(vkb_button, pos, 2)
+        self.kb_pos = 2
+
+
+    def toggle_vkb(self, grid, pw):
+        if self.vkb: grid.removeItem(self.vkb)
+        self.vkb = self.virtual_keyboard(self.vkb_index, pw)
+        grid.addLayout(self.vkb, self.kb_pos, 0, 1, 3)
+        self.vkb_index += 1
+
+
+    def virtual_keyboard(self, i, pw):
+        import random
+        i = i%3
+        if i == 0:
+            chars = 'abcdefghijklmnopqrstuvwxyz '
+        elif i == 1:
+            chars = 'ABCDEFGHIJKLMNOPQRTSUVWXYZ '
+        elif i == 2:
+            chars = '1234567890!?.,;:/%&()[]{}+-'
+            
+        n = len(chars)
+        s = []
+        for i in xrange(n):
+            while True:
+                k = random.randint(0,n-1)
+                if k not in s:
+                    s.append(k)
+                    break
+
+        def add_target(t):
+            return lambda: pw.setText(str( pw.text() ) + t)
+            
+        vbox = QVBoxLayout()
+        grid = QGridLayout()
+        grid.setSpacing(2)
+        for i in range(n):
+            l_button = QPushButton(chars[s[i]])
+            l_button.setFixedWidth(25)
+            l_button.setFixedHeight(25)
+            l_button.clicked.connect(add_target(chars[s[i]]) )
+            grid.addWidget(l_button, i/6, i%6)
+
+        vbox.addLayout(grid)
+
+        return vbox
+