Resolves #343 GUI and Frame Refactor

Major rewrite of the GUI into a module and view form, also using a new Feed class. The frame and frameset data structures have also been rewritten to support memory pooling and response frames.

applications/gui2/src/views/addsource.cpp

@@ -8,6 +8,7 @@
 #include <nanogui/button.h>
 #include <nanogui/vscrollpanel.h>
 #include <nanogui/tabwidget.h>
+#include <nanogui/formhelper.h>
 
 #include <loguru.hpp>
 
@@ -168,13 +169,38 @@ void AddSourceWindow::rebuild() {
 		_addButton(s, tab_items_[2]);
 	}
 
-	button = new Button(tab_items_[3], "Add Host", ENTYPO_ICON_PLUS);
-	button->setIconPosition(Button::IconPosition::Left);
-	button->setIconExtraScale(1.2);
+	auto *host_menu = new Widget(tab_items_[3]);
+	host_menu->setLayout(new BoxLayout(nanogui::Orientation::Horizontal, nanogui::Alignment::Maximum, 5,4));
+
+	button = new Button(host_menu, "Add", ENTYPO_ICON_PLUS);
 	button->setFontSize(18);
-	button->setTooltip("Manually add a new connection URI");
+	button->setTooltip("Connect to a new machine");
 	button->setCallback([this]() {
+		FormHelper *fh = new FormHelper(screen());
+		auto *win = fh->addWindow(Vector2i(10,10), "Add Host");
+		win->center();
+		win->setTheme(dynamic_cast<ftl::gui2::Screen*>(win->screen())->getTheme("window_dark"));
+		//win->setWidth(200);
+		fh->addVariable<std::string>("URI", [this,win](const std::string &v) {
+			try {
+				ctrl_->add(v);
+			} catch (const ftl::exception &e) {
+				LOG(ERROR) << "Add failed: " << e.what();
+			}
+			win->dispose();
+		}, [this]() {
+			return "";
+		})->setFixedWidth(150);
+		win->screen()->performLayout();
+		delete fh;
+	});
 
+	button = new Button(host_menu, "Clear", ENTYPO_ICON_CYCLE);
+	button->setFontSize(18);
+	button->setTooltip("Clear host history");
+	button->setCallback([this]() {
+		ctrl_->feed()->clearHostHistory();
+		uptodate_.clear();
 	});
 
 	auto hostsrcs = ctrl_->getHosts();
@@ -239,9 +265,7 @@ void AddSourceWindow::draw(NVGcontext *ctx) {
 	{
 		UNIQUE_LOCK(mutex_, lk);
 		if (!uptodate_.test_and_set()) {
-			tabs_->requestFocus();
-			// Note the 1, first widget is the title bar buttons
-			//while(childCount() > 1) { removeChild(childCount()-1); }
+			tabs_->requestFocus();  // Must ensure focus item not deleted
 			rebuild();
 			screen()->performLayout();
 		}