qml: Don't allow Coin selection if there are none available

Author: johnny9

src/qml/controls/LabeledCoinControlButton.qml

@@ -8,6 +8,7 @@ import QtQuick.Layouts 1.15
 
 Item {
     property int coinsSelected: 0
+    property int coinCount: 0
 
     signal openCoinControl
 
@@ -32,7 +33,9 @@ Item {
         color: Theme.color.orangeLight1
         font.pixelSize: 18
         text: {
-            if (coinsSelected === 0) {
+            if (coinCount === 0) {
+                qsTr("No coins available")
+            } else if (coinsSelected === 0) {
                 qsTr("Select")
             } else {
                 qsTr("%1 input%2 selected")
@@ -43,7 +46,11 @@ Item {
 
         MouseArea {
             anchors.fill: parent
-            onClicked: root.openCoinControl()
+            onClicked: {
+                if (coinCount > 0) {
+                    root.openCoinControl()
+                }
+            }
             cursorShape: Qt.PointingHandCursor
         }
     }

src/qml/models/coinslistmodel.cpp

@@ -15,6 +15,7 @@
 CoinsListModel::CoinsListModel(WalletQmlModel* parent)
     : QAbstractListModel(parent), m_wallet_model(parent), m_sort_by("amount"), m_total_amount(0)
 {
+    update();
 }
 
 CoinsListModel::~CoinsListModel() = default;
@@ -73,6 +74,7 @@ void CoinsListModel::update()
         }
     }
     endResetModel();
+    Q_EMIT coinCountChanged();
 }
 
 void CoinsListModel::setSortBy(const QString& roleName)
@@ -129,3 +131,8 @@ bool CoinsListModel::overRequiredAmount() const
 {
     return m_total_amount > m_wallet_model->sendRecipient()->cAmount();
 }
+
+int CoinsListModel::coinCount() const
+{
+    return m_coins.size();
+}

src/qml/models/coinslistmodel.h

@@ -20,6 +20,7 @@ class CoinsListModel : public QAbstractListModel
     Q_OBJECT
     Q_PROPERTY(int lockedCoinsCount READ lockedCoinsCount NOTIFY lockedCoinsCountChanged)
     Q_PROPERTY(int selectedCoinsCount READ selectedCoinsCount NOTIFY selectedCoinsCountChanged)
+    Q_PROPERTY(int coinCount READ coinCount NOTIFY coinCountChanged)
     Q_PROPERTY(QString totalSelected READ totalSelected NOTIFY selectedCoinsCountChanged)
     Q_PROPERTY(QString changeAmount READ changeAmount NOTIFY selectedCoinsCountChanged)
     Q_PROPERTY(bool overRequiredAmount READ overRequiredAmount NOTIFY selectedCoinsCountChanged)
@@ -50,11 +51,13 @@ public Q_SLOTS:
     QString totalSelected() const;
     QString changeAmount() const;
     bool overRequiredAmount() const;
+    int coinCount() const;
 
 Q_SIGNALS:
     void sortByChanged(const QString& roleName);
     void lockedCoinsCountChanged();
     void selectedCoinsCountChanged();
+    void coinCountChanged();
 
 private:
     WalletQmlModel* m_wallet_model;

src/qml/pages/wallet/Send.qml

@@ -185,6 +185,7 @@ PageStack {
                     visible: settings.coinControlEnabled
                     Layout.fillWidth: true
                     coinsSelected: wallet.coinsListModel.selectedCoinsCount
+                    coinCount: wallet.coinsListModel.coinCount
                     onOpenCoinControl: {
                         root.wallet.coinsListModel.update()
                         root.push(coinSelectionPage)