Implement heightForWidth support for QTabWidget and QStackedLayout.

In order to add the support we also had to add hasHeightForWidth to
QWidget that calls the new virtual hasHeightForWidth() in QWidgetPrivate

Task-number: QTBUG-7792
Reviewed-by: Paul

1 files changed, 47 insertions, 0 deletions

diff --git a/tests/auto/qtabwidget/tst_qtabwidget.cpp b/tests/auto/qtabwidget/tst_qtabwidget.cpp
index 4491fb3..204c27a 100644
--- a/tests/auto/qtabwidget/tst_qtabwidget.cpp
+++ b/tests/auto/qtabwidget/tst_qtabwidget.cpp
@@ -45,6 +45,7 @@
 #include <qdebug.h>
 #include <qapplication.h>
 #include <qlabel.h>
+#include <qboxlayout.h>
 
 //TESTED_CLASS=
 //TESTED_FILES=
@@ -120,6 +121,8 @@ class tst_QTabWidget:public QObject {
     void clear();
     void keyboardNavigation();
     void paintEventCount();
+    void heightForWidth();
+    void heightForWidth_data();
 
   private:
     int addPage();
@@ -621,6 +624,50 @@ void tst_QTabWidget::paintEventCount()
     QCOMPARE(tab2->count, 1);
 }
 
+void tst_QTabWidget::heightForWidth_data()
+{
+    QTest::addColumn<int>("tabPosition");
+    QTest::newRow("West") << int(QTabWidget::West);
+    QTest::newRow("North") << int(QTabWidget::North);
+    QTest::newRow("East") << int(QTabWidget::East);
+    QTest::newRow("South") << int(QTabWidget::South);
+}
+
+void tst_QTabWidget::heightForWidth()
+{
+    QFETCH(int, tabPosition);
+
+    QWidget *window = new QWidget;
+    QVBoxLayout *lay = new QVBoxLayout(window);
+    lay->setMargin(0);
+    lay->setSpacing(0);
+    QTabWidget *tabWid = new QTabWidget(window);
+    QWidget *w = new QWidget;
+    tabWid->addTab(w, QLatin1String("HFW page"));
+    tabWid->setTabPosition(QTabWidget::TabPosition(tabPosition));
+    QVBoxLayout *lay2 = new QVBoxLayout(w);
+    QLabel *label = new QLabel("Label with wordwrap turned on makes it trade height for width."
+                               " Make it a really long text so that it spans on several lines"
+                               " when the label is on its narrowest."
+                               " I don't like to repeat myself."
+                               " I don't like to repeat myself."
+                               " I don't like to repeat myself."
+                               " I don't like to repeat myself."
+                               );
+    label->setWordWrap(true);
+    lay2->addWidget(label);
+    lay2->setMargin(0);
+
+    lay->addWidget(tabWid);
+    int h = window->heightForWidth(160);
+    window->resize(160, h);
+    window->show();
+
+    QTest::qWaitForWindowShown(window);
+    QVERIFY(label->height() >= label->heightForWidth(label->width()));
+
+    delete window;
+}
 
 QTEST_MAIN(tst_QTabWidget)
 #include "tst_qtabwidget.moc"