qml: add word picker to SeedTextArea

electrum/gui/qml/components/controls/SeedTextArea.qml

@@ -1,20 +1,102 @@
-import QtQuick 2.6
+import QtQuick 2.15
 import QtQuick.Layouts 1.0
-import QtQuick.Controls 2.1
+import QtQuick.Controls 2.15
 import QtQuick.Controls.Material 2.0
 
+import org.electrum 1.0
+
+Pane {
+    id: root
+    implicitHeight: rootLayout.height
+    padding: 0
+
+    property alias readOnly: seedtextarea.readOnly
+    property alias text: seedtextarea.text
+    property alias placeholderText: seedtextarea.placeholderText
+
+    property var _suggestions: []
+
+    background: Rectangle {
+        color: "transparent"
+    }
+
+    ColumnLayout {
+        id: rootLayout
+        width: parent.width
+        spacing: 0
+        Flickable {
+            Layout.preferredWidth: parent.width
+            Layout.minimumHeight: fontMetrics.lineSpacing + 2*constants.paddingXXSmall + 2*constants.paddingXSmall + 2
+            implicitHeight: wordsLayout.height
+
+            visible: !readOnly
+            flickableDirection: Flickable.HorizontalFlick
+            contentWidth: wordsLayout.width
+            interactive: wordsLayout.width > width
+
+            RowLayout {
+                id: wordsLayout
+                Repeater {
+                    model: _suggestions
+                    Rectangle {
+                        Layout.margins: constants.paddingXXSmall
+                        width: suggestionLabel.width
+                        height: suggestionLabel.height
+                        color: constants.lighterBackground
+                        radius: constants.paddingXXSmall
+                        Label {
+                            id: suggestionLabel
+                            text: modelData
+                            padding: constants.paddingXSmall
+                            leftPadding: constants.paddingSmall
+                            rightPadding: constants.paddingSmall
+                        }
+                        MouseArea {
+                            anchors.fill: parent
+                            onClicked: {
+                                var words = seedtextarea.text.split(' ')
+                                words.pop()
+                                words.push(modelData)
+                                seedtextarea.text = words.join(' ') + ' '
+                            }
+                        }
+                    }
+                }
+            }
+        }
+
         TextArea {
-    id: seedtext
+            id: seedtextarea
             Layout.fillWidth: true
-    Layout.minimumHeight: 80
+            Layout.minimumHeight: fontMetrics.height * 3 + topPadding + bottomPadding
+
             rightPadding: constants.paddingLarge
             leftPadding: constants.paddingLarge
+
             wrapMode: TextInput.WordWrap
             font.bold: true
             font.pixelSize: constants.fontSizeLarge
+            font.family: FixedFont
             inputMethodHints: Qt.ImhSensitiveData | Qt.ImhPreferLowercase | Qt.ImhNoPredictiveText
+
             background: Rectangle {
-        color: "transparent"
+                color: constants.darkerBackground
-        border.color: Material.accentColor
+            }
+
+            onTextChanged: {
+                _suggestions = bitcoin.mnemonicsFor(seedtextarea.text.split(' ').pop())
+                // TODO: cursorPosition only on suggestion apply
+                cursorPosition = text.length
+            }
+        }
+    }
+
+    FontMetrics {
+        id: fontMetrics
+        font: seedtextarea.font
+    }
+
+    Bitcoin {
+        id: bitcoin
     }
 }

electrum/gui/qml/components/wizard/WCConfirmSeed.qml

@@ -41,6 +41,7 @@ WizardComponent {
             SeedTextArea {
                 id: confirm
                 Layout.fillWidth: true
+                placeholderText: qsTr('Enter your seed')
                 onTextChanged: checkValid()
             }
 

electrum/gui/qml/components/wizard/WCHaveSeed.qml

@@ -165,16 +165,13 @@ WizardComponent {
                 Layout.columnSpan: 2
             }
 
-            Label {
-                Layout.topMargin: constants.paddingMedium
-                Layout.columnSpan: 2
-                text: cosigner ? qsTr('Enter cosigner seed') : qsTr('Enter your seed')
-            }
-
             SeedTextArea {
                 id: seedtext
                 Layout.fillWidth: true
                 Layout.columnSpan: 2
+
+                placeholderText: cosigner ? qsTr('Enter cosigner seed') : qsTr('Enter your seed')
+
                 onTextChanged: {
                     validationTimer.restart()
                 }

electrum/gui/qml/qebitcoin.py

@@ -10,7 +10,8 @@ from electrum.logging import get_logger
 from electrum.slip39 import decode_mnemonic, Slip39Error
 from electrum.util import parse_URI, create_bip21_uri, InvalidBitcoinURI, get_asyncio_loop
 from electrum.transaction import tx_from_any
-from electrum.mnemonic import is_any_2fa_seed_type
+from electrum.mnemonic import Mnemonic, is_any_2fa_seed_type
+from electrum.old_mnemonic import wordlist as old_wordlist
 
 from .qetypes import QEAmount
 
@@ -26,6 +27,8 @@ class QEBitcoin(QObject):
     validationMessageChanged = pyqtSignal()
     _validationMessage = ''
 
+    _words = None
+
     def __init__(self, config, parent=None):
         super().__init__(parent)
         self.config = config
@@ -165,3 +168,11 @@ class QEBitcoin(QObject):
     @pyqtSlot(str, result=bool)
     def isPrivateKeyList(self, csv: str):
         return keystore.is_private_key_list(csv)
+
+    @pyqtSlot(str, result='QVariantList')
+    def mnemonicsFor(self, fragment):
+        if not fragment:
+            return []
+        if not self._words:
+            self._words = set(Mnemonic('en').wordlist).union(set(old_wordlist))
+        return sorted(filter(lambda x: x.startswith(fragment), self._words))