Utils: Start decoupling LayoutBuilder from Aspects

Makes it easier reusable elsewhere.

Change-Id: I86ff9f40229a33690f854f5fda692bc06d6976ef
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/libs/utils/aspects.cpp

@@ -421,10 +421,17 @@ QAction *BaseAspect::action()
     Adds the visual representation of this aspect to a layout using
     a layout builder.
 */
-void BaseAspect::addToLayout(Layouting::LayoutBuilder &)
+void BaseAspect::addToLayout(LayoutBuilder &)
 {
 }
 
+void doLayout(const BaseAspect &aspect, LayoutBuilder &builder)
+{
+    const_cast<BaseAspect &>(aspect).addToLayout(builder);
+    if (builder.layoutType() == LayoutBuilder::FormLayout || builder.layoutType() == LayoutBuilder::VBoxLayout)
+        builder.finishRow();
+}
+
 /*!
     Updates this aspect's value from user-initiated changes in the widget.
 

src/libs/utils/aspects.h

@@ -25,7 +25,11 @@ namespace Utils {
 
 class AspectContainer;
 class BoolAspect;
-namespace Layouting { class LayoutBuilder; }
+
+namespace Layouting {
+class LayoutBuilder;
+class LayoutItem;
+} // Layouting
 
 namespace Internal {
 class AspectContainerPrivate;
@@ -206,6 +210,8 @@ private:
     std::unique_ptr<Internal::BaseAspectPrivate> d;
 };
 
+QTCREATOR_UTILS_EXPORT void doLayout(const BaseAspect &aspect, Layouting::LayoutBuilder &builder);
+
 class QTCREATOR_UTILS_EXPORT BoolAspect : public BaseAspect
 {
     Q_OBJECT

src/libs/utils/layoutbuilder.cpp

@@ -9,12 +9,12 @@
 #include <QFormLayout>
 #include <QGridLayout>
 #include <QGroupBox>
+#include <QLabel>
 #include <QPushButton>
 #include <QStackedLayout>
 #include <QSplitter>
 #include <QStyle>
 #include <QTabWidget>
-#include <QWidget>
 
 namespace Utils::Layouting {
 
@@ -51,42 +51,23 @@ LayoutItem::LayoutItem()
 
 
 /*!
-    Constructs a layout item proxy for \a layout.
+    \fn  template <class T> LayoutItem(const T &t)
+
+    Constructs a layout item proxy for \a t.
+
+    T could be
+    \list
+    \li  \c {QString}
+    \li  \c {QWidget *}
+    \li  \c {QLayout *}
+    \endlist
  */
-LayoutItem::LayoutItem(QLayout *layout)
-    : layout(layout)
-{}
+
 
 /*!
-    Constructs a layout item proxy for \a widget.
+    Constructs a layout item representing something that knows how to add it
+    to a layout by itself.
  */
-LayoutItem::LayoutItem(QWidget *widget)
-    : widget(widget)
-{}
-
-/*!
-    Constructs a layout item representing a \c BaseAspect.
-
-    This ultimately uses the \a aspect's \c addToLayout(LayoutBuilder &) function,
-    which in turn can add one or more layout items to the target layout.
-
-    \sa BaseAspect::addToLayout()
- */
-LayoutItem::LayoutItem(BaseAspect &aspect)
-    : aspect(&aspect)
-{}
-
-LayoutItem::LayoutItem(BaseAspect *aspect)
-    : aspect(aspect)
-{}
-
-/*!
-    Constructs a layout item containing some static \a text.
- */
-LayoutItem::LayoutItem(const QString &text)
-    : text(text)
-{}
-
 QLayout *LayoutBuilder::createLayout() const
 {
     QLayout *layout = nullptr;
@@ -276,7 +257,7 @@ static void doLayoutHelper(QLayout *layout,
 /*!
     Constructs a layout item from the contents of another LayoutBuilder
  */
-LayoutItem::LayoutItem(const LayoutBuilder &builder)
+void LayoutItem::setBuilder(const LayoutBuilder &builder)
 {
     layout = builder.createLayout();
     doLayoutHelper(layout, builder.m_items, Layouting::WithoutMargins);
@@ -357,10 +338,8 @@ LayoutBuilder &LayoutBuilder::addRow(const LayoutItems &items)
  */
 LayoutBuilder &LayoutBuilder::addItem(const LayoutItem &item)
 {
-    if (item.aspect) {
-        item.aspect->addToLayout(*this);
-        if (m_layoutType == FormLayout || m_layoutType == VBoxLayout)
-            finishRow();
+    if (item.onAdd) {
+        item.onAdd(*this);
     } else {
         m_items.push_back(item);
     }
@@ -427,29 +406,6 @@ LayoutExtender::~LayoutExtender()
 
 // Special items
 
-Break::Break()
-{
-    specialType = SpecialType::Break;
-}
-
-Stretch::Stretch(int stretch)
-{
-    specialType = SpecialType::Stretch;
-    specialValue = stretch;
-}
-
-Space::Space(int space)
-{
-    specialType = SpecialType::Space;
-    specialValue = space;
-}
-
-Span::Span(int span_, const LayoutItem &item)
-{
-    LayoutItem::operator=(item);
-    span = span_;
-}
-
 Tab::Tab(const QString &tabName, const LayoutBuilder &item)
 {
     text = tabName;
@@ -457,11 +413,6 @@ Tab::Tab(const QString &tabName, const LayoutBuilder &item)
     item.attachTo(widget);
 }
 
-HorizontalRule::HorizontalRule()
-{
-    specialType = SpecialType::HorizontalRule;
-}
-
 // "Widgets"
 
 static void applyItems(QWidget *widget, const QList<LayoutItem> &items)

src/libs/utils/layoutbuilder.h

@@ -18,10 +18,7 @@ class QTabWidget;
 class QWidget;
 QT_END_NAMESPACE
 
-namespace Utils {
-class BaseAspect;
-class BoolAspect;
-} // Utils
+namespace Utils { class BoolAspect; }
 
 namespace Utils::Layouting {
 
@@ -32,6 +29,43 @@ enum AttachType {
 };
 
 class LayoutBuilder;
+class LayoutItem;
+
+// Special items
+
+class QTCREATOR_UTILS_EXPORT Space
+{
+public:
+    explicit Space(int space) : space(space) {}
+    const int space;
+};
+
+class QTCREATOR_UTILS_EXPORT Stretch
+{
+public:
+    explicit Stretch(int stretch = 1) : stretch(stretch) {}
+    const int stretch;
+};
+
+class QTCREATOR_UTILS_EXPORT Break
+{
+public:
+    Break() {}
+};
+
+class QTCREATOR_UTILS_EXPORT Span
+{
+public:
+    Span(int span, const LayoutItem &item) : span(span), item(item) {}
+    const int span;
+    const LayoutItem &item;
+};
+
+class QTCREATOR_UTILS_EXPORT HorizontalRule
+{
+public:
+    HorizontalRule() {}
+};
 
 // LayoutItem
 
@@ -52,18 +86,49 @@ public:
     };
 
     using Setter = std::function<void(QObject *target)>;
+    using OnAdder = std::function<void(LayoutBuilder &)>;
+
     LayoutItem();
-    LayoutItem(QLayout *layout);
-    LayoutItem(QWidget *widget);
-    LayoutItem(BaseAspect *aspect); // Remove
-    LayoutItem(BaseAspect &aspect);
-    LayoutItem(const QString &text);
-    LayoutItem(const LayoutBuilder &builder);
-    LayoutItem(const Setter &setter) { this->setter = setter; }
+
+    template <class T> LayoutItem(const T &t)
+    {
+        if constexpr (std::is_same_v<QString, T>) {
+            text = t;
+        } else if constexpr (std::is_same_v<Space, T>) {
+            specialType = LayoutItem::SpecialType::Space;
+            specialValue = t.space;
+        } else if constexpr (std::is_same_v<Stretch, T>) {
+            specialType = LayoutItem::SpecialType::Stretch;
+            specialValue = t.stretch;
+        } else if constexpr (std::is_same_v<Break, T>) {
+            specialType = LayoutItem::SpecialType::Break;
+        } else if constexpr (std::is_same_v<Span, T>) {
+            LayoutItem::operator=(t.item);
+            span = t.span;
+        } else if constexpr (std::is_same_v<HorizontalRule, T>) {
+            specialType = SpecialType::HorizontalRule;
+        } else if constexpr (std::is_base_of_v<LayoutBuilder, T>) {
+            setBuilder(t);
+        } else if constexpr (std::is_base_of_v<LayoutItem, T>) {
+            LayoutItem::operator=(t);
+        } else if constexpr (std::is_base_of_v<Setter, T>) {
+            setter = t;
+        } else if constexpr (std::is_base_of_v<QLayout, std::remove_pointer_t<T>>) {
+            layout = t;
+        } else if constexpr (std::is_base_of_v<QWidget, std::remove_pointer_t<T>>) {
+            widget = t;
+        } else if constexpr (std::is_pointer_v<T>) {
+            onAdd = [t](LayoutBuilder &builder) { doLayout(*t, builder); };
+        } else {
+            onAdd = [&t](LayoutBuilder &builder) { doLayout(t, builder); };
+        }
+    }
+
+    void setBuilder(const LayoutBuilder &builder);
 
     QLayout *layout = nullptr;
     QWidget *widget = nullptr;
-    BaseAspect *aspect = nullptr;
+    OnAdder onAdd;
 
     QString text; // FIXME: Use specialValue for that
     int span = 1;
@@ -73,42 +138,12 @@ public:
     QVariant specialValue;
 };
 
-class QTCREATOR_UTILS_EXPORT Space : public LayoutItem
-{
-public:
-    explicit Space(int space);
-};
-
-class QTCREATOR_UTILS_EXPORT Span : public LayoutItem
-{
-public:
-    Span(int span, const LayoutItem &item);
-};
-
-class QTCREATOR_UTILS_EXPORT Stretch : public LayoutItem
-{
-public:
-    explicit Stretch(int stretch = 1);
-};
-
 class QTCREATOR_UTILS_EXPORT Tab : public LayoutItem
 {
 public:
     Tab(const QString &tabName, const LayoutBuilder &item);
 };
 
-class QTCREATOR_UTILS_EXPORT Break : public LayoutItem
-{
-public:
-    Break();
-};
-
-class QTCREATOR_UTILS_EXPORT HorizontalRule : public LayoutItem
-{
-public:
-    HorizontalRule();
-};
-
 class QTCREATOR_UTILS_EXPORT Group : public LayoutItem
 {
 public:

tests/manual/tasktree/taskwidget.cpp

@@ -184,7 +184,11 @@ Tasking::WorkflowPolicy GroupWidget::workflowPolicy() const
     return m_workflowPolicy;
 }
 
-TaskGroup::TaskGroup(QWidget *group, std::initializer_list<LayoutItem> items)
-    : Row({ group, Group { Column { items } } })
-{}
+
+void doLayout(const TaskGroup &taskGroup, LayoutBuilder &builder)
+{
+    builder.addItem(taskGroup.group);
+    builder.addItem(Group { taskGroup.items });
+    builder.finishRow();
+}
 

tests/manual/tasktree/taskwidget.h

@@ -76,8 +76,11 @@ private:
     Utils::Tasking::WorkflowPolicy m_workflowPolicy = Utils::Tasking::WorkflowPolicy::StopOnError;
 };
 
-class TaskGroup : public Utils::Layouting::Row
+class TaskGroup
 {
 public:
-    TaskGroup(QWidget *group, std::initializer_list<Utils::Layouting::LayoutItem> items);
+    QWidget *group;
+    Utils::Layouting::Column items;
 };
+
+void doLayout(const TaskGroup &taskGroup, Utils::Layouting::LayoutBuilder &builder);