qml: ReceiveDialog: clicking QR code to show encoded text

closes https://github.com/spesmilo/electrum/issues/8331

electrum/gui/qml/components/ReceiveDialog.qml

@@ -85,6 +85,7 @@ ElDialog {
                             QRImage {
                                 qrdata: _bolt11
                                 render: _render_qr
+                                enable_toggle_text: true
                             }
                         }
                         Component {
@@ -92,6 +93,7 @@ ElDialog {
                             QRImage {
                                 qrdata: _bip21uri
                                 render: _render_qr
+                                enable_toggle_text: true
                             }
                         }
                         Component {
@@ -99,32 +101,10 @@ ElDialog {
                             QRImage {
                                 qrdata: _address
                                 render: _render_qr
+                                enable_toggle_text: true
                             }
                         }
                     }
-
-                    MouseArea {
-                        anchors.fill: parent
-                        onClicked: {
-                            if (rootLayout.state == 'bolt11') {
-                                if (_bip21uri != '')
-                                    rootLayout.state = 'bip21uri'
-                                else if (_address != '')
-                                    rootLayout.state = 'address'
-                            } else if (rootLayout.state == 'bip21uri') {
-                                if (_address != '')
-                                    rootLayout.state = 'address'
-                                else if (_bolt11 != '')
-                                    rootLayout.state = 'bolt11'
-                            } else if (rootLayout.state == 'address') {
-                                if (_bolt11 != '')
-                                    rootLayout.state = 'bolt11'
-                                else if (_bip21uri != '')
-                                    rootLayout.state = 'bip21uri'
-                            }
-                            Config.preferredRequestType = rootLayout.state
-                        }
-                    }
                 }
 
                 RowLayout {

electrum/gui/qml/components/controls/QRImage.qml

@@ -7,6 +7,9 @@ Item {
     property bool render: true // init to false, then set true if render needs delay
     property var qrprops: QRIP.getDimensions(qrdata)
 
+    property bool enable_toggle_text: false  // if true, clicking the QR code shows the encoded text
+    property bool is_in_text_state: false    // internal state, if the above is enabled
+
     width: r.width
     height: r.height
 
@@ -19,6 +22,7 @@ Item {
 
     Image {
         source: qrdata && render ? 'image://qrgen/' + qrdata : ''
+        visible: !is_in_text_state
 
         Rectangle {
             visible: root.render && qrprops.valid
@@ -44,4 +48,27 @@ Item {
             anchors.centerIn: parent
         }
     }
+
+    Label {
+        visible: is_in_text_state
+        text: qrdata
+        wrapMode: Text.WrapAnywhere
+        elide: Text.ElideRight
+        anchors.centerIn: parent
+        horizontalAlignment: Qt.AlignHCenter
+        verticalAlignment: Qt.AlignVCenter
+        color: 'black'
+        width: r.width
+        height: r.height
+    }
+
+    MouseArea {
+        anchors.fill: parent
+        onClicked: {
+            if (enable_toggle_text) {
+                root.is_in_text_state = !root.is_in_text_state
+            }
+        }
+    }
+
 }