VisualBuilder: Support loading a saved form from JSON.

The form to load is specified on the command line, e.g "vb test.frm".

DevTools/VisualBuilder/VBForm.cpp

@@ -1,6 +1,7 @@
 #include "VBForm.h"
 #include "VBProperty.h"
 #include "VBWidget.h"
+#include "VBWidgetRegistry.h"
 #include <AK/JsonArray.h>
 #include <AK/JsonObject.h>
 #include <LibCore/CFile.h>
@@ -24,22 +25,6 @@ VBForm::VBForm(const String& name, GWidget* parent)
     set_background_color(Color::LightGray);
     set_greedy_for_hits(true);
 
-    auto box1 = VBWidget::create(VBWidgetType::GSpinBox, *this);
-    box1->set_rect({ 10, 10, 81, 21 });
-    m_widgets.append(move(box1));
-
-    auto box2 = VBWidget::create(VBWidgetType::GTextEditor, *this);
-    box2->set_rect({ 100, 100, 161, 161 });
-    m_widgets.append(move(box2));
-
-    auto button1 = VBWidget::create(VBWidgetType::GButton, *this);
-    button1->set_rect({ 200, 50, 81, 21 });
-    m_widgets.append(move(button1));
-
-    auto groupbox1 = VBWidget::create(VBWidgetType::GGroupBox, *this);
-    groupbox1->set_rect({ 300, 150, 161, 51 });
-    m_widgets.append(move(groupbox1));
-
     m_context_menu = make<GMenu>("Context menu");
     m_context_menu->add_action(GAction::create("Move to front", [this](auto&) {
         if (auto* widget = single_selected_widget())
@@ -305,6 +290,41 @@ void VBForm::mousemove_event(GMouseEvent& event)
     }
 }
 
+void VBForm::load_from_file(const String& path)
+{
+    CFile file(path);
+    if (!file.open(CIODevice::ReadOnly)) {
+        GMessageBox::show(String::format("Could not open '%s' for reading", path.characters()), "Error", GMessageBox::Type::Error, window());
+        return;
+    }
+
+    auto file_contents = file.read_all();
+    auto form_json = JsonValue::from_string(file_contents);
+
+    if (!form_json.is_object()) {
+        GMessageBox::show(String::format("Could not parse '%s'", path.characters()), "Error", GMessageBox::Type::Error, window());
+        return;
+    }
+
+    m_name = form_json.as_object().get("name").to_string();
+    auto widgets = form_json.as_object().get("widgets").as_array();
+
+    widgets.for_each([&](const JsonValue& widget_value) {
+        auto& widget_object = widget_value.as_object();
+        auto widget_class = widget_object.get("class").as_string();
+        auto widget_type = widget_type_from_class_name(widget_class);
+        auto vbwidget = VBWidget::create(widget_type, *this);
+        widget_object.for_each_member([&](auto& property_name, const JsonValue& property_value) {
+            (void)property_name;
+            (void)property_value;
+            VBProperty& property = vbwidget->property(property_name);
+            dbgprintf("Set property %s.%s to '%s'\n", widget_class.characters(), property_name.characters(), property_value.serialized().characters());
+            property.set_value(property_value);
+        });
+        m_widgets.append(vbwidget);
+    });
+}
+
 void VBForm::write_to_file(const String& path)
 {
     CFile file(path);

DevTools/VisualBuilder/VBForm.h

@@ -26,6 +26,7 @@ public:
 
     Function<void(VBWidget*)> on_widget_selected;
 
+    void load_from_file(const String& path);
     void write_to_file(const String& path);
     void dump();
 

DevTools/VisualBuilder/VBWidgetRegistry.cpp

@@ -11,7 +11,7 @@
 #include <LibGUI/GSpinBox.h>
 #include <LibGUI/GTextEditor.h>
 
-static String to_class_name(VBWidgetType type)
+String to_class_name(VBWidgetType type)
 {
     switch (type) {
     case VBWidgetType::GWidget:
@@ -41,6 +41,33 @@ static String to_class_name(VBWidgetType type)
     }
 }
 
+VBWidgetType widget_type_from_class_name(const StringView& name)
+{
+    if (name == "GWidget")
+        return VBWidgetType::GWidget;
+    if (name == "GButton")
+        return VBWidgetType::GButton;
+    if (name == "GLabel")
+        return VBWidgetType::GLabel;
+    if (name == "GSpinBox")
+        return VBWidgetType::GSpinBox;
+    if (name == "GTextEditor")
+        return VBWidgetType::GTextEditor;
+    if (name == "GProgressBar")
+        return VBWidgetType::GProgressBar;
+    if (name == "GCheckBox")
+        return VBWidgetType::GCheckBox;
+    if (name == "GRadioButton")
+        return VBWidgetType::GRadioButton;
+    if (name == "GScrollBar")
+        return VBWidgetType::GScrollBar;
+    if (name == "GGroupBox")
+        return VBWidgetType::GGroupBox;
+    if (name == "GSlider")
+        return VBWidgetType::GSlider;
+    ASSERT_NOT_REACHED();
+}
+
 static GWidget* build_gwidget(VBWidgetType type, GWidget* parent)
 {
     switch (type) {

DevTools/VisualBuilder/VBWidgetRegistry.h

@@ -20,3 +20,6 @@ public:
 
     static GWidget* build_gwidget(VBWidget&, VBWidgetType, GWidget* parent, Vector<OwnPtr<VBProperty>>&);
 };
+
+String to_class_name(VBWidgetType);
+VBWidgetType widget_type_from_class_name(const StringView&);

DevTools/VisualBuilder/main.cpp

@@ -68,6 +68,10 @@ int main(int argc, char** argv)
 
     propbox->show();
 
+    if (argc == 2) {
+        form1->load_from_file(argv[1]);
+    }
+
     return app.exec();
 }