From a1737ecbd0aaea0aa8ce34557663cf0b4cdb8910 Mon Sep 17 00:00:00 2001
From: Dennis Brentjes <d.brentjes@gmail.com>
Date: Fri, 30 May 2014 22:15:28 +0200
Subject: Unified and simplified the widget creation api.

---
 form.hpp       | 27 ++++++++-------------------
 main.cpp       | 11 +++++------
 qt_adapter.hpp | 37 ++++++++++++++++++++++++++++++++++---
 3 files changed, 47 insertions(+), 28 deletions(-)

diff --git a/form.hpp b/form.hpp
index e90a3da..66a798e 100644
--- a/form.hpp
+++ b/form.hpp
@@ -144,7 +144,7 @@ private slots:
 
 //This base is required because an QObject may not be templated and Form is a class template.
 //Slots can be virtual however.
-class QtFormBase : public QObject
+class QtFormBase : public QMdiArea
 {
 
 	Q_OBJECT
@@ -159,12 +159,12 @@ template <typename T>
 struct Form : public QtFormBase, public FusionModelObserver {
 	
 	std::shared_ptr<T> model;
-	QMdiArea* area;
 	QVBoxLayout* layout;
 	QFormLayout* form_layout;
 	QHBoxLayout* button_layout;
 	QPushButton* prev;
 	QLineEdit* jump_edit;
+	QLabel* label;
 	QPushButton* next;
 	std::vector<std::shared_ptr<FormUpdateHandler>> updatehandlers;
 	std::map<int, QLineEdit*> line_edits;
@@ -173,12 +173,12 @@ struct Form : public QtFormBase, public FusionModelObserver {
 	
 	Form(std::shared_ptr<T> model)
 	: model(model)
-	, area(new QMdiArea())
 	, layout(new QVBoxLayout())
 	, form_layout(new QFormLayout())
 	, button_layout(new QHBoxLayout())
 	, prev(new QPushButton("&Previous"))
 	, jump_edit(new QLineEdit())
+	, label(new QLabel())
 	, next(new QPushButton("&Next"))
 	, updatehandlers()
 	, line_edits()
@@ -196,18 +196,20 @@ struct Form : public QtFormBase, public FusionModelObserver {
 		layout->addLayout(form_layout);
 		layout->addLayout(button_layout);
 		
+		label->setText("/" + QString::number(model->row_count()));
+		label->setMaximumWidth(100);
+		
 		button_layout->addWidget(prev);
 		button_layout->addWidget(jump_edit);
+		button_layout->addWidget(label);
 		button_layout->addWidget(next);
 		button_layout->setAlignment(Qt::AlignHCenter);
 		
-		area->setLayout(layout);
+		setLayout(layout);
 		
 		setup_gui();
 		fill_data();
 		
-		area->updateGeometry();
-		
 		set_button_state();
 		connect(
 			prev, SIGNAL(clicked()),
@@ -310,17 +312,4 @@ struct Form : public QtFormBase, public FusionModelObserver {
 		int i = clamp_index(current_index + 1);
 		set_current_index(i);
 	}
-	
-	QWidget* get_widget()
-	{
-		return area;
-	}
 };
-
-template <typename Model>
-std::shared_ptr<Form<Model>> make_form(std::shared_ptr<Model> model)
-{
-	auto ret = std::make_shared<Form<Model>>(model);
-	model->add_observer(ret);
-	return ret;
-}
diff --git a/main.cpp b/main.cpp
index b631722..2adb4e8 100644
--- a/main.cpp
+++ b/main.cpp
@@ -85,16 +85,15 @@ int main()
 
 	MainWindow w;
 	
-	auto widget1 = std::make_shared<CustomDataModelWidget>(model);
-	auto widget2 = make_qt_widget(model);
-	auto widget3 = make_qt_widget(mapping);
+	auto widget1 = make_qt_widget<CustomDataModelWidget>(model);
+	auto widget2 = make_qt_widget<Gui::Table>(model);
+	auto widget3 = make_qt_widget<Gui::Table>(mapping);
+	auto widget4 = make_qt_widget<Gui::Form>(model);
 	
-	auto form = make_form(model);
-	
-	w.add_widget(form->get_widget());
 	w.add_widget(widget1.get());
 	w.add_widget(widget2.get());
 	w.add_widget(widget3.get());
+	w.add_widget(widget4.get());;
 	
 	int ret = w.show_and_run();
 	
diff --git a/qt_adapter.hpp b/qt_adapter.hpp
index 9a5c383..405f4f9 100644
--- a/qt_adapter.hpp
+++ b/qt_adapter.hpp
@@ -4,6 +4,7 @@
 #include "boost_any_qvariant_convert.hpp"
 #include "meta_types.hpp"
 #include "gui_item_delegate.hpp"
+#include "form.hpp"
 
 #include <QAbstractTableModel>
 #include <QTableView>
@@ -16,6 +17,12 @@
 #include <vector>
 #include <map>
 
+namespace Gui
+{
+	struct Table{};
+	struct Form{};
+}
+
 template <typename T>
 struct QtModelType
 {
@@ -215,9 +222,33 @@ struct WidgetType {
 	typedef typename AdapterType<Model>::type::widget type;
 };
 
-template <typename Model>
-std::shared_ptr<typename WidgetType<Model>::type> make_qt_widget(std::shared_ptr<Model> x)
+//Generate a default Table-based widget.
+template <typename GuiType, typename Model, typename... Args>
+typename std::enable_if<std::is_same<Gui::Table, GuiType>::value, std::shared_ptr<typename WidgetType<Model>::type>>::type
+make_qt_widget(std::shared_ptr<Model> model, Args... args)
 {
-	auto widget_ptr = std::make_shared<typename WidgetType<Model>::type>(x);
+	auto widget_ptr = std::make_shared<typename WidgetType<Model>::type>(model, args...);
 	return widget_ptr;
 }
+
+//Generate a default Form based widget.
+template <typename GuiType, typename Model, typename... Args>
+typename std::enable_if<std::is_same<Gui::Form, GuiType>::value, std::shared_ptr<Form<Model>>>::type
+make_qt_widget(std::shared_ptr<Model> model, Args... args)
+{
+	auto widget_ptr = std::make_shared<Form<Model>>(model, args...);
+	return widget_ptr;
+}
+
+//Generate a custom widget thats is neither a default Form or Table, for total specialisation of the function.
+template <typename GuiType, typename Model, typename... Args>
+typename std::enable_if<
+	!std::is_same<Gui::Form, GuiType>::value &&
+	!std::is_same<Gui::Table, GuiType>::value, std::shared_ptr<GuiType>
+>::type
+make_qt_widget(std::shared_ptr<Model> model, Args... args)
+{
+	auto widget_ptr = std::make_shared<GuiType>(model, args...);
+	return widget_ptr;
+}
+
-- 
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