Merge #11015: [Qt] Add delay before filtering transactions

Summary:
7b137aced [Qt] Add delay before filtering transactions Fixes 3141 (Lucas Betschart)

Pull request description:

  As discussed in bitcoin/bitcoin#3141.

  This adds a QTimer pause of 200ms before start to filter so it should be possible to filter big data sets easier.

Tree-SHA512: ee599367794eac2c5b8bc7ecac47f44295e40c0ff543ff2f2c4860590f917b59b1cfb273fa564e6eb4c44016c0ef412d49f1a8f1b36b07e034022f51bb76653c

Backport of Core PR11015
bitcoin/bitcoin#11015

Test Plan:
  make check
  ./bitcoin-qt -> transactions -> enter a filter

Reviewers: deadalnix, Fabien, jasonbcox, O1 Bitcoin ABC, #bitcoin_abc

Reviewed By: Fabien, jasonbcox, O1 Bitcoin ABC, #bitcoin_abc

Differential Revision: https://reviews.bitcoinabc.org/D3832

src/qt/transactionview.cpp

@@ -31,6 +31,7 @@
 #include <QPoint>
 #include <QScrollBar>
 #include <QTableView>
+#include <QTimer>
 #include <QUrl>
 #include <QVBoxLayout>
 
@@ -123,6 +124,17 @@ TransactionView::TransactionView(const PlatformStyle *platformStyle,
     amountWidget->setValidator(new QDoubleValidator(0, 1e20, 8, this));
     hlayout->addWidget(amountWidget);
 
+    // Delay before filtering transactions in ms
+    static const int input_filter_delay = 200;
+
+    QTimer *amount_typing_delay = new QTimer(this);
+    amount_typing_delay->setSingleShot(true);
+    amount_typing_delay->setInterval(input_filter_delay);
+
+    QTimer *prefix_typing_delay = new QTimer(this);
+    prefix_typing_delay->setSingleShot(true);
+    prefix_typing_delay->setInterval(input_filter_delay);
+
     QVBoxLayout *vlayout = new QVBoxLayout(this);
     vlayout->setContentsMargins(0, 0, 0, 0);
     vlayout->setSpacing(0);
@@ -176,7 +188,10 @@ TransactionView::TransactionView(const PlatformStyle *platformStyle,
     contextMenu->addAction(editLabelAction);
 
     // Connect actions
-    connect(amountWidget, &QLineEdit::textChanged, this,  &TransactionView::changedAmount);
+    connect(amountWidget, SIGNAL(textChanged(QString)), amount_typing_delay,      SLOT(start()));
+    connect(amount_typing_delay, SIGNAL(timeout()), this,           SLOT(changedAmount()));
+    connect(addressWidget, SIGNAL(textChanged(QString)), prefix_typing_delay,         SLOT(start()));
+    connect(prefix_typing_delay, SIGNAL(timeout()), this,            SLOT(changedPrefix()));
 
     connect(dateWidget,
             static_cast<void (QComboBox::*)(int)>(&QComboBox::activated), this,
@@ -200,6 +215,8 @@ TransactionView::TransactionView(const PlatformStyle *platformStyle,
     connect(copyTxPlainText, &QAction::triggered, this,   &TransactionView::copyTxPlainText);
     connect(editLabelAction, &QAction::triggered, this,   &TransactionView::editLabel);
     connect(showDetailsAction, &QAction::triggered, this,   &TransactionView::showDetails);
+
+
 }
 
 void TransactionView::setModel(WalletModel *_model) {
@@ -336,22 +353,22 @@ void TransactionView::chooseWatchonly(int idx) {
             watchOnlyWidget->itemData(idx).toInt()));
 }
 
-void TransactionView::changedPrefix(const QString &prefix) {
+void TransactionView::changedPrefix() {
     if (!transactionProxyModel) {
         return;
     }
 
-    transactionProxyModel->setAddressPrefix(prefix);
+    transactionProxyModel->setAddressPrefix(addressWidget->text());
 }
 
-void TransactionView::changedAmount(const QString &amount) {
+void TransactionView::changedAmount() {
     if (!transactionProxyModel) {
         return;
     }
 
     Amount amount_parsed = Amount::zero();
-    if (BitcoinUnits::parse(model->getOptionsModel()->getDisplayUnit(), amount,
-                            &amount_parsed)) {
+    if (BitcoinUnits::parse(model->getOptionsModel()->getDisplayUnit(),
+                            amountWidget->text(), &amount_parsed)) {
         transactionProxyModel->setMinAmount(amount_parsed);
     } else {
         transactionProxyModel->setMinAmount(Amount::zero());

src/qt/transactionview.h

@@ -115,8 +115,8 @@ public Q_SLOTS:
     void chooseDate(int idx);
     void chooseType(int idx);
     void chooseWatchonly(int idx);
-    void changedPrefix(const QString &prefix);
-    void changedAmount(const QString &amount);
+    void changedAmount();
+    void changedPrefix();
     void exportClicked();
     void focusTransaction(const QModelIndex &);
     void focusTransaction(const uint256 &txid);