Basic GUI Creation

Entry posted by GorzenDev · October 14, 2017

2,370 views

Bare with me im not a very good story teller .
I will not be focusing on basic leadwerks usage and assume the reader knows a thing or 2 about leadwerks.

So lets start with the basics,
Create a window and context.

bool App::Start()
{
	window = Leadwerks::Window::Create("GUI Tutorial", 0, 0, 1024, 768);
	context = Leadwerks::Context::Create(window);
  
  	return true;
}

bool App::Loop()
{
	if (window->Closed() || window->KeyHit(Key::Escape)) return false;

	return true;
}

Now i personally like to use classes for my GUI so thats what we are gonna do.
Create a new class called "UI_Interface".

UI_Interface.h

#pragma once

#include "Leadwerks.h"

//Forward declare
class App;

using namespace Leadwerks;

class UI_Interface
{
private:
	App* app = NULL;
	//
	GUI* gui = NULL;
public:
	UI_Interface();
	UI_Interface(App* pApp);
	~UI_Interface();

	void Process();
	bool ProcessEvent(Event event);
};

UI_Interface.cpp

#include "UI_Interface.h"

//Forward declares
#include "App.h"

UI_Interface::UI_Interface() {}

UI_Interface::UI_Interface(App* pApp)
{

}

UI_Interface::~UI_Interface()
{
}

void UI_Interface::Process()
{
	while (EventQueue::Peek())
	{
		Event event = EventQueue::Wait();
		ProcessEvent(event);
	}
}

bool UI_Interface::ProcessEvent(Event event)
{
	if (event.id == Event::WidgetSelect)
	{

	}
	//
	if (event.id == Event::WidgetAction)
	{

	}
	//
	return false;
}

now that we have a interface class lets first make sure it is created and called in your main function or app.

App.h

#pragma once

#include "Leadwerks.h"
#include "UI_Interface.h"

#undef GetFileType

using namespace Leadwerks;

class App
{
public:
	Leadwerks::Window* window;
	Context* context;
	World* world;
	Camera* camera;

	UI_Interface* ui_Interface = NULL;

	App();
	virtual ~App();

    bool Start();
    bool Loop();
};

App.cpp

#include "App.h"

using namespace Leadwerks;

App::App() : window(NULL), context(NULL), world(NULL), camera(NULL) {}

App::~App() { delete ui_Interface; delete world; delete window; }

bool App::Start()
{
	window = Leadwerks::Window::Create("GUI Tutorial", 0, 0, 1024, 768);
	context = Leadwerks::Context::Create(window);

	//create GUI
	ui_Interface = new UI_Interface(this);

	return true;
}

bool App::Loop()
{
	if (window->Closed() || window->KeyHit(Key::Escape))
	{
		return false;
	}

	context->SetColor(0.0, 0.0, 0.0);
	context->Clear();

	//
	ui_Interface->Process();

	//
	Time::Update();

	//
	//world->Update();

	//
	//world->Render();

	//
	context->Sync();

	return true;
}

Now lets create the GUI in the UI_Interface class.

UI_Interface::UI_Interface(App* pApp)
{
	app = pApp;
	//
	//create gui
	gui = GUI::Create(app->context);
	float guiScale = gui->GetScale();
	gui->GetBase()->SetScript("Scripts/GUI/Panel.lua");
  	//make the base gui invisible if you want
	//gui->GetBase()->SetObject("backgroundcolor", new Vec4(0, 0, 0, 0));
}