From 8b5aa7a7dedcb52d0af2b1241a5f27d105e81cab Mon Sep 17 00:00:00 2001
From: Christian Ehrlicher <ch.ehrlicher@gmx.de>
Date: Fri, 4 Dec 2020 23:13:15 +0100
Subject: [PATCH 006/147] QTableView: honor spans when calculating height/width
 hint

QTableViewPrivate::heightHintForIndex()/widthHintForIndex() did not
honor spans and therefore returned too big values.

Fixes: QTBUG-89116
Change-Id: I52948902b7eaaa27c092ed39da68950c3840e8e4
Pick-to: 5.15
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@qt.io>
(cherry picked from commit 0e4cc2aca7eb77879d20142e761773a891b33f10)
---
 src/widgets/itemviews/qtableview.cpp          | 17 +++++
 .../itemviews/qtableview/tst_qtableview.cpp   | 65 +++++++++++++++++++
 2 files changed, 82 insertions(+)

diff --git a/src/widgets/itemviews/qtableview.cpp b/src/widgets/itemviews/qtableview.cpp
index d120c41dc9..09d34005a7 100644
--- a/src/widgets/itemviews/qtableview.cpp
+++ b/src/widgets/itemviews/qtableview.cpp
@@ -1013,6 +1013,7 @@ void QTableViewPrivate::drawCell(QPainter *painter, const QStyleOptionViewItem &
 int QTableViewPrivate::widthHintForIndex(const QModelIndex &index, int hint, const QStyleOptionViewItem &option) const
 {
     Q_Q(const QTableView);
+    const int oldHint = hint;
     QWidget *editor = editorForIndex(index).widget.data();
     if (editor && persistent.contains(editor)) {
         hint = qMax(hint, editor->sizeHint().width());
@@ -1021,6 +1022,17 @@ int QTableViewPrivate::widthHintForIndex(const QModelIndex &index, int hint, con
         hint = qBound(min, hint, max);
     }
     hint = qMax(hint, q->itemDelegate(index)->sizeHint(option, index).width());
+
+    if (hasSpans()) {
+        auto span = spans.spanAt(index.column(), index.row());
+        if (span && span->m_left == index.column() && span->m_top == index.row()) {
+            // spans are screwed up when sections are moved
+            const auto left = logicalColumn(span->m_left);
+            for (int i = 1; i <= span->width(); ++i)
+               hint -= q->columnWidth(visualColumn(left + i));
+        }
+        hint = std::max(hint, oldHint);
+    }
     return hint;
 }
 
@@ -1053,6 +1065,11 @@ int QTableViewPrivate::heightHintForIndex(const QModelIndex &index, int hint, QS
         option.rect.setHeight(height);
         option.rect.setX(q->columnViewportPosition(index.column()));
         option.rect.setWidth(q->columnWidth(index.column()));
+        if (hasSpans()) {
+            auto span = spans.spanAt(index.column(), index.row());
+            if (span && span->m_left == index.column() && span->m_top == index.row())
+                option.rect.setWidth(std::max(option.rect.width(), visualSpanRect(*span).width()));
+        }
         // 1px less space when grid is shown (see drawCell)
         if (showGrid)
             option.rect.setWidth(option.rect.width() - 1);
diff --git a/tests/auto/widgets/itemviews/qtableview/tst_qtableview.cpp b/tests/auto/widgets/itemviews/qtableview/tst_qtableview.cpp
index 761357b252..06bb706074 100644
--- a/tests/auto/widgets/itemviews/qtableview/tst_qtableview.cpp
+++ b/tests/auto/widgets/itemviews/qtableview/tst_qtableview.cpp
@@ -397,6 +397,7 @@ private slots:
     void checkHeaderMinSize();
 
     void resizeToContents();
+    void resizeToContentsSpans();
 
     void tabFocus();
     void bigModel();
@@ -3721,6 +3722,70 @@ void tst_QTableView::resizeToContents()
 
 }
 
+
+class SpanModel : public QAbstractTableModel
+{
+public:
+    SpanModel(bool sectionsMoved)
+        : _sectionsMoved(sectionsMoved)
+    {}
+    int columnCount(const QModelIndex & = {}) const override { return 2; }
+    int rowCount(const QModelIndex & = {}) const override { return 1; }
+    QVariant data(const QModelIndex &idx, int role = Qt::DisplayRole) const override
+    {
+        if (role != Qt::DisplayRole)
+            return QVariant();
+        const int col = _sectionsMoved ? 1 - idx.column() : idx.column();
+        if (col == 0)
+            return "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.";
+        return QVariant();
+    }
+private:
+    bool _sectionsMoved;
+};
+
+
+void tst_QTableView::resizeToContentsSpans()
+{
+    SpanModel model1(false);
+    SpanModel model2(true);
+    QTableView view1, view2, view3;
+    view1.setModel(&model1);
+    view2.setModel(&model2);
+    view2.horizontalHeader()->moveSection(0, 1);
+    view3.setModel(&model1);
+
+    view1.setSpan(0, 0, 1, 2);
+    view2.setSpan(0, 1, 1, 2);
+    view1.show();
+    view2.show();
+    view3.show();
+    QVERIFY(QTest::qWaitForWindowExposed(&view1));
+    QVERIFY(QTest::qWaitForWindowExposed(&view2));
+    QVERIFY(QTest::qWaitForWindowExposed(&view3));
+    view1.setColumnWidth(0, 100);
+    view1.setColumnWidth(1, 100);
+    view2.setColumnWidth(0, 100);
+    view2.setColumnWidth(1, 100);
+    view3.setColumnWidth(0, 200);
+
+    view1.resizeRowToContents(0);
+    view2.resizeRowToContents(0);
+    view3.resizeRowToContents(0);
+    QCOMPARE(view1.rowHeight(0), view3.rowHeight(0));
+    QCOMPARE(view2.rowHeight(0), view3.rowHeight(0));
+
+    view3.resizeColumnToContents(0);
+    view3.resizeRowToContents(0);
+    // height should be only 1 text line for easy testing
+    view1.setRowHeight(0, view3.verticalHeader()->sectionSize(0));
+    view2.setRowHeight(0, view3.verticalHeader()->sectionSize(0));
+    view1.resizeColumnToContents(0);
+    view2.resizeColumnToContents(1);
+    QCOMPARE(view1.columnWidth(0), view3.columnWidth(0) - view1.columnWidth(1));
+    QCOMPARE(view2.columnWidth(0), view3.columnWidth(0) - view2.columnWidth(1));
+}
+
 QT_BEGIN_NAMESPACE
 extern bool Q_WIDGETS_EXPORT qt_tab_all_widgets(); // qapplication.cpp
 QT_END_NAMESPACE
-- 
2.40.1