Target setup page: Fix some glitches

- Make sure the "Manage" button is always enabled.
- Clear the list of possible build configs and collapse
  the details widget when a kit becomes unusable.
- Do not collapse the details widget when it gets selected.
- The "Details" button was sometimes grayed out when it shouldn't
  have been.

Change-Id: Ibc0f44213b633aebddfa7542d7dbdd0244df23f9
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/libs/utils/detailsbutton.cpp

@@ -110,6 +110,14 @@ bool DetailsButton::event(QEvent *e)
     return false;
 }
 
+void DetailsButton::changeEvent(QEvent *e)
+{
+    if (e->type() == QEvent::EnabledChange) {
+        m_checkedPixmap = QPixmap();
+        m_uncheckedPixmap = QPixmap();
+    }
+}
+
 void DetailsButton::paintEvent(QPaintEvent *e)
 {
     QWidget::paintEvent(e);

src/libs/utils/detailsbutton.h

@@ -71,6 +71,7 @@ public:
 protected:
     void paintEvent(QPaintEvent *e) override;
     bool event(QEvent *e) override;
+    void changeEvent(QEvent *e) override;
 
 private:
     QPixmap cacheRendering(const QSize &size, bool checked);

src/libs/utils/detailswidget.cpp

@@ -229,6 +229,16 @@ void DetailsWidget::setUseCheckBox(bool b)
     d->updateControls();
 }
 
+void DetailsWidget::setCheckable(bool b)
+{
+    d->m_summaryCheckBox->setEnabled(b);
+}
+
+void DetailsWidget::setExpandable(bool b)
+{
+    d->m_detailsButton->setEnabled(b);
+}
+
 void DetailsWidget::setChecked(bool b)
 {
     d->m_summaryCheckBox->setChecked(b);

src/libs/utils/detailswidget.h

@@ -78,6 +78,8 @@ public:
 
     bool useCheckBox();
     void setUseCheckBox(bool b);
+    void setCheckable(bool b);
+    void setExpandable(bool b);
     void setIcon(const QIcon &icon);
 
     static QPixmap createBackground(const QSize &size, int topHeight, QWidget *widget);

src/plugins/projectexplorer/targetsetupwidget.cpp

@@ -122,7 +122,7 @@ bool TargetSetupWidget::isKitSelected() const
 void TargetSetupWidget::setKitSelected(bool b)
 {
     // Only check target if there are build configurations possible
-    b &= !selectedBuildInfoList().isEmpty();
+    b &= hasSelectedBuildConfigurations();
     m_ignoreChange = true;
     m_detailsWidget->setChecked(b);
     m_detailsWidget->widget()->setEnabled(b);
@@ -187,9 +187,12 @@ void TargetSetupWidget::targetCheckBoxToggled(bool b)
     if (m_ignoreChange)
         return;
     m_detailsWidget->widget()->setEnabled(b);
-    m_detailsWidget->setState(b && Utils::contains(m_infoStore, &BuildInfoStore::hasIssues)
+    if (b && (contains(m_infoStore, &BuildInfoStore::hasIssues)
-                              ? Utils::DetailsWidget::Expanded
+              || !contains(m_infoStore, &BuildInfoStore::isEnabled))) {
-                              : Utils::DetailsWidget::Collapsed);
+        m_detailsWidget->setState(DetailsWidget::Expanded);
+    } else if (!b) {
+        m_detailsWidget->setState(Utils::DetailsWidget::Collapsed);
+    }
     emit selectedToggled();
 }
 
@@ -230,12 +233,13 @@ void TargetSetupWidget::update(const Kit::Predicate &predicate)
     // Kits that don't fulfill the project predicate are not selectable, because we cannot
     // guarantee that we can handle the project sensibly (e.g. qmake project without Qt).
     if (predicate && !predicate(kit())) {
-        setEnabled(false);
+        toggleEnabled(false);
+        m_infoStore.clear();
         m_detailsWidget->setToolTip(tr("You cannot use this kit, because it does not fulfill "
                                        "the project's prerequisites."));
         return;
     }
-    setEnabled(true);
+    toggleEnabled(true);
     m_detailsWidget->setIcon(kit()->isValid() ? kit()->icon() : Icons::CRITICAL.icon());
     m_detailsWidget->setToolTip(m_kit->toHtml());
     updateDefaultBuildDirectories();
@@ -251,6 +255,22 @@ const QList<BuildInfo> TargetSetupWidget::buildInfoList(const Kit *k, const File
     return {info};
 }
 
+bool TargetSetupWidget::hasSelectedBuildConfigurations() const
+{
+    return !selectedBuildInfoList().isEmpty();
+}
+
+void TargetSetupWidget::toggleEnabled(bool enabled)
+{
+    m_detailsWidget->widget()->setEnabled(enabled && hasSelectedBuildConfigurations());
+    m_detailsWidget->setCheckable(enabled);
+    m_detailsWidget->setExpandable(enabled);
+    if (!enabled) {
+        m_detailsWidget->setState(DetailsWidget::Collapsed);
+        m_detailsWidget->setChecked(false);
+    }
+}
+
 const QList<BuildInfo> TargetSetupWidget::selectedBuildInfoList() const
 {
     QList<BuildInfo> result;

src/plugins/projectexplorer/targetsetupwidget.h

@@ -78,6 +78,9 @@ signals:
 private:
     static const QList<BuildInfo> buildInfoList(const Kit *k, const Utils::FilePath &projectPath);
 
+    bool hasSelectedBuildConfigurations() const;
+
+    void toggleEnabled(bool enabled);
     void checkBoxToggled(bool b);
     void pathChanged();
     void targetCheckBoxToggled(bool b);