Merge bitcoin-core/gui#204: Drop buggy TableViewLastColumnResizingFixer class

3913d1e8c1f604bdd622d5e81e5077ef52b30466 qt: Drop buggy TableViewLastColumnResizingFixer class (Hennadii Stepanov)

Pull request description:

  In Qt 5 the last column resizing with dragging its left edge works out-of-the-box.

  The current `TableViewLastColumnResizingFixer` implementation could put the last column content out of the view port and confuse a user:
  ![Screenshot from 2021-01-31 18-04-32](https://user-images.githubusercontent.com/32963518/106390022-fd6bd180-63ee-11eb-9216-6e5117f8dc96.png)

  Historical context:
  - https://github.com/bitcoin/bitcoin/pull/2862
  - https://github.com/bitcoin/bitcoin/pull/3626
  - https://github.com/bitcoin/bitcoin/pull/3738
  - https://github.com/bitcoin/bitcoin/pull/3920

  #205 is a nice addition.

ACKs for top commit:
  jarolrod:
    ACK 3913d1e8c1f604bdd622d5e81e5077ef52b30466, tested on macOS 11.1 Qt 5.15.2
  Talkless:
    tACK 3913d1e8c1f604bdd622d5e81e5077ef52b30466, tested on Debian Sid. Can confirm that behavior in previous commit does not produce scroll bar, last column gets "hidden". This PR makes clear that there's more to see in the view.
  promag:
    Tested ACK 3913d1e8c1f604bdd622d5e81e5077ef52b30466 on macos.

Tree-SHA512: 12582dfce54bb1db3d9934ae092e305d32e9760cc99b0265322e161fa7f54b7d6fb6cefedf700783f767d5c3a56a8545c8d2f5ade66596c4e67b8a5287063e8a

6 files changed, 4 insertions, 182 deletions

diff --git a/src/qt/guiutil.cpp b/src/qt/guiutil.cpp
index 4107538d45..d72ed0c3ff 100644
--- a/src/qt/guiutil.cpp
+++ b/src/qt/guiutil.cpp
@@ -470,120 +470,6 @@ bool LabelOutOfFocusEventFilter::eventFilter(QObject* watched, QEvent* event)
     return QObject::eventFilter(watched, event);
 }
 
-void TableViewLastColumnResizingFixer::connectViewHeadersSignals()
-{
-    connect(tableView->horizontalHeader(), &QHeaderView::sectionResized, this, &TableViewLastColumnResizingFixer::on_sectionResized);
-    connect(tableView->horizontalHeader(), &QHeaderView::geometriesChanged, this, &TableViewLastColumnResizingFixer::on_geometriesChanged);
-}
-
-// We need to disconnect these while handling the resize events, otherwise we can enter infinite loops.
-void TableViewLastColumnResizingFixer::disconnectViewHeadersSignals()
-{
-    disconnect(tableView->horizontalHeader(), &QHeaderView::sectionResized, this, &TableViewLastColumnResizingFixer::on_sectionResized);
-    disconnect(tableView->horizontalHeader(), &QHeaderView::geometriesChanged, this, &TableViewLastColumnResizingFixer::on_geometriesChanged);
-}
-
-// Setup the resize mode, handles compatibility for Qt5 and below as the method signatures changed.
-// Refactored here for readability.
-void TableViewLastColumnResizingFixer::setViewHeaderResizeMode(int logicalIndex, QHeaderView::ResizeMode resizeMode)
-{
-    tableView->horizontalHeader()->setSectionResizeMode(logicalIndex, resizeMode);
-}
-
-void TableViewLastColumnResizingFixer::resizeColumn(int nColumnIndex, int width)
-{
-    tableView->setColumnWidth(nColumnIndex, width);
-    tableView->horizontalHeader()->resizeSection(nColumnIndex, width);
-}
-
-int TableViewLastColumnResizingFixer::getColumnsWidth()
-{
-    int nColumnsWidthSum = 0;
-    for (int i = 0; i < columnCount; i++)
-    {
-        nColumnsWidthSum += tableView->horizontalHeader()->sectionSize(i);
-    }
-    return nColumnsWidthSum;
-}
-
-int TableViewLastColumnResizingFixer::getAvailableWidthForColumn(int column)
-{
-    int nResult = lastColumnMinimumWidth;
-    int nTableWidth = tableView->horizontalHeader()->width();
-
-    if (nTableWidth > 0)
-    {
-        int nOtherColsWidth = getColumnsWidth() - tableView->horizontalHeader()->sectionSize(column);
-        nResult = std::max(nResult, nTableWidth - nOtherColsWidth);
-    }
-
-    return nResult;
-}
-
-// Make sure we don't make the columns wider than the table's viewport width.
-void TableViewLastColumnResizingFixer::adjustTableColumnsWidth()
-{
-    disconnectViewHeadersSignals();
-    resizeColumn(lastColumnIndex, getAvailableWidthForColumn(lastColumnIndex));
-    connectViewHeadersSignals();
-
-    int nTableWidth = tableView->horizontalHeader()->width();
-    int nColsWidth = getColumnsWidth();
-    if (nColsWidth > nTableWidth)
-    {
-        resizeColumn(secondToLastColumnIndex,getAvailableWidthForColumn(secondToLastColumnIndex));
-    }
-}
-
-// Make column use all the space available, useful during window resizing.
-void TableViewLastColumnResizingFixer::stretchColumnWidth(int column)
-{
-    disconnectViewHeadersSignals();
-    resizeColumn(column, getAvailableWidthForColumn(column));
-    connectViewHeadersSignals();
-}
-
-// When a section is resized this is a slot-proxy for ajustAmountColumnWidth().
-void TableViewLastColumnResizingFixer::on_sectionResized(int logicalIndex, int oldSize, int newSize)
-{
-    adjustTableColumnsWidth();
-    int remainingWidth = getAvailableWidthForColumn(logicalIndex);
-    if (newSize > remainingWidth)
-    {
-       resizeColumn(logicalIndex, remainingWidth);
-    }
-}
-
-// When the table's geometry is ready, we manually perform the stretch of the "Message" column,
-// as the "Stretch" resize mode does not allow for interactive resizing.
-void TableViewLastColumnResizingFixer::on_geometriesChanged()
-{
-    if ((getColumnsWidth() - this->tableView->horizontalHeader()->width()) != 0)
-    {
-        disconnectViewHeadersSignals();
-        resizeColumn(secondToLastColumnIndex, getAvailableWidthForColumn(secondToLastColumnIndex));
-        connectViewHeadersSignals();
-    }
-}
-
-/**
- * Initializes all internal variables and prepares the
- * the resize modes of the last 2 columns of the table and
- */
-TableViewLastColumnResizingFixer::TableViewLastColumnResizingFixer(QTableView* table, int lastColMinimumWidth, int allColsMinimumWidth, QObject *parent) :
-    QObject(parent),
-    tableView(table),
-    lastColumnMinimumWidth(lastColMinimumWidth),
-    allColumnsMinimumWidth(allColsMinimumWidth)
-{
-    columnCount = tableView->horizontalHeader()->count();
-    lastColumnIndex = columnCount - 1;
-    secondToLastColumnIndex = columnCount - 2;
-    tableView->horizontalHeader()->setMinimumSectionSize(allColumnsMinimumWidth);
-    setViewHeaderResizeMode(secondToLastColumnIndex, QHeaderView::Interactive);
-    setViewHeaderResizeMode(lastColumnIndex, QHeaderView::Interactive);
-}
-
 #ifdef WIN32
 fs::path static StartupShortcutPath()
 {
diff --git a/src/qt/guiutil.h b/src/qt/guiutil.h
index a671e830f1..3134c98429 100644
--- a/src/qt/guiutil.h
+++ b/src/qt/guiutil.h
@@ -181,45 +181,6 @@ namespace GUIUtil
         bool eventFilter(QObject* watched, QEvent* event) override;
     };
 
-    /**
-     * Makes a QTableView last column feel as if it was being resized from its left border.
-     * Also makes sure the column widths are never larger than the table's viewport.
-     * In Qt, all columns are resizable from the right, but it's not intuitive resizing the last column from the right.
-     * Usually our second to last columns behave as if stretched, and when on stretch mode, columns aren't resizable
-     * interactively or programmatically.
-     *
-     * This helper object takes care of this issue.
-     *
-     */
-    class TableViewLastColumnResizingFixer: public QObject
-    {
-        Q_OBJECT
-
-        public:
-            TableViewLastColumnResizingFixer(QTableView* table, int lastColMinimumWidth, int allColsMinimumWidth, QObject *parent);
-            void stretchColumnWidth(int column);
-
-        private:
-            QTableView* tableView;
-            int lastColumnMinimumWidth;
-            int allColumnsMinimumWidth;
-            int lastColumnIndex;
-            int columnCount;
-            int secondToLastColumnIndex;
-
-            void adjustTableColumnsWidth();
-            int getAvailableWidthForColumn(int column);
-            int getColumnsWidth();
-            void connectViewHeadersSignals();
-            void disconnectViewHeadersSignals();
-            void setViewHeaderResizeMode(int logicalIndex, QHeaderView::ResizeMode resizeMode);
-            void resizeColumn(int nColumnIndex, int width);
-
-        private Q_SLOTS:
-            void on_sectionResized(int logicalIndex, int oldSize, int newSize);
-            void on_geometriesChanged();
-    };
-
     bool GetStartOnSystemStartup();
     bool SetStartOnSystemStartup(bool fAutoStart);
 
diff --git a/src/qt/receivecoinsdialog.cpp b/src/qt/receivecoinsdialog.cpp
index 0aea920c86..15f9c8591b 100644
--- a/src/qt/receivecoinsdialog.cpp
+++ b/src/qt/receivecoinsdialog.cpp
@@ -24,7 +24,6 @@
 ReceiveCoinsDialog::ReceiveCoinsDialog(const PlatformStyle *_platformStyle, QWidget *parent) :
     QDialog(parent, GUIUtil::dialog_flags),
     ui(new Ui::ReceiveCoinsDialog),
-    columnResizingFixer(nullptr),
     model(nullptr),
     platformStyle(_platformStyle)
 {
@@ -78,7 +77,6 @@ void ReceiveCoinsDialog::setModel(WalletModel *_model)
         QTableView* tableView = ui->recentRequestsView;
 
         tableView->verticalHeader()->hide();
-        tableView->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
         tableView->setModel(_model->getRecentRequestsTableModel());
         tableView->setAlternatingRowColors(true);
         tableView->setSelectionBehavior(QAbstractItemView::SelectRows);
@@ -86,12 +84,12 @@ void ReceiveCoinsDialog::setModel(WalletModel *_model)
         tableView->setColumnWidth(RecentRequestsTableModel::Date, DATE_COLUMN_WIDTH);
         tableView->setColumnWidth(RecentRequestsTableModel::Label, LABEL_COLUMN_WIDTH);
         tableView->setColumnWidth(RecentRequestsTableModel::Amount, AMOUNT_MINIMUM_COLUMN_WIDTH);
+        tableView->horizontalHeader()->setMinimumSectionSize(MINIMUM_COLUMN_WIDTH);
+        tableView->horizontalHeader()->setStretchLastSection(true);
 
         connect(tableView->selectionModel(),
             &QItemSelectionModel::selectionChanged, this,
             &ReceiveCoinsDialog::recentRequestsView_selectionChanged);
-        // Last 2 columns are set by the columnResizingFixer, when the table geometry is ready.
-        columnResizingFixer = new GUIUtil::TableViewLastColumnResizingFixer(tableView, AMOUNT_MINIMUM_COLUMN_WIDTH, DATE_COLUMN_WIDTH, this);
 
         if (model->wallet().getDefaultAddressType() == OutputType::BECH32) {
             ui->useBech32->setCheckState(Qt::Checked);
@@ -235,14 +233,6 @@ void ReceiveCoinsDialog::on_removeRequestButton_clicked()
     model->getRecentRequestsTableModel()->removeRows(firstIndex.row(), selection.length(), firstIndex.parent());
 }
 
-// We override the virtual resizeEvent of the QWidget to adjust tables column
-// sizes as the tables width is proportional to the dialogs width.
-void ReceiveCoinsDialog::resizeEvent(QResizeEvent *event)
-{
-    QWidget::resizeEvent(event);
-    columnResizingFixer->stretchColumnWidth(RecentRequestsTableModel::Message);
-}
-
 QModelIndex ReceiveCoinsDialog::selectedRow()
 {
     if(!model || !model->getRecentRequestsTableModel() || !ui->recentRequestsView->selectionModel())
diff --git a/src/qt/receivecoinsdialog.h b/src/qt/receivecoinsdialog.h
index 9b89bd6a8b..1ef84640f2 100644
--- a/src/qt/receivecoinsdialog.h
+++ b/src/qt/receivecoinsdialog.h
@@ -51,14 +51,12 @@ public Q_SLOTS:
 
 private:
     Ui::ReceiveCoinsDialog *ui;
-    GUIUtil::TableViewLastColumnResizingFixer *columnResizingFixer;
     WalletModel *model;
     QMenu *contextMenu;
     const PlatformStyle *platformStyle;
 
     QModelIndex selectedRow();
     void copyColumnToClipboard(int column);
-    virtual void resizeEvent(QResizeEvent *event) override;
 
 private Q_SLOTS:
     void on_receiveButton_clicked();
diff --git a/src/qt/transactionview.cpp b/src/qt/transactionview.cpp
index 0cf6480b82..22cbb7fb69 100644
--- a/src/qt/transactionview.cpp
+++ b/src/qt/transactionview.cpp
@@ -217,7 +217,6 @@ void TransactionView::setModel(WalletModel *_model)
 
         transactionProxyModel->setSortRole(Qt::EditRole);
 
-        transactionView->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
         transactionView->setModel(transactionProxyModel);
         transactionView->setAlternatingRowColors(true);
         transactionView->setSelectionBehavior(QAbstractItemView::SelectRows);
@@ -231,8 +230,8 @@ void TransactionView::setModel(WalletModel *_model)
         transactionView->setColumnWidth(TransactionTableModel::Date, DATE_COLUMN_WIDTH);
         transactionView->setColumnWidth(TransactionTableModel::Type, TYPE_COLUMN_WIDTH);
         transactionView->setColumnWidth(TransactionTableModel::Amount, AMOUNT_MINIMUM_COLUMN_WIDTH);
-
-        columnResizingFixer = new GUIUtil::TableViewLastColumnResizingFixer(transactionView, AMOUNT_MINIMUM_COLUMN_WIDTH, MINIMUM_COLUMN_WIDTH, this);
+        transactionView->horizontalHeader()->setMinimumSectionSize(MINIMUM_COLUMN_WIDTH);
+        transactionView->horizontalHeader()->setStretchLastSection(true);
 
         if (_model->getOptionsModel())
         {
@@ -623,14 +622,6 @@ void TransactionView::focusTransaction(const uint256& txid)
     }
 }
 
-// We override the virtual resizeEvent of the QWidget to adjust tables column
-// sizes as the tables width is proportional to the dialogs width.
-void TransactionView::resizeEvent(QResizeEvent* event)
-{
-    QWidget::resizeEvent(event);
-    columnResizingFixer->stretchColumnWidth(TransactionTableModel::ToAddress);
-}
-
 // Need to override default Ctrl+C action for amount as default behaviour is just to copy DisplayRole text
 bool TransactionView::eventFilter(QObject *obj, QEvent *event)
 {
diff --git a/src/qt/transactionview.h b/src/qt/transactionview.h
index b268823066..72d6cc31b8 100644
--- a/src/qt/transactionview.h
+++ b/src/qt/transactionview.h
@@ -82,10 +82,6 @@ private:
 
     QWidget *createDateRangeWidget();
 
-    GUIUtil::TableViewLastColumnResizingFixer *columnResizingFixer{nullptr};
-
-    virtual void resizeEvent(QResizeEvent* event) override;
-
     bool eventFilter(QObject *obj, QEvent *event) override;
 
 private Q_SLOTS: