87 lines
2.4 KiB
C++
87 lines
2.4 KiB
C++
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/*
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src/nanogui_helloworld.cpp -- C++ version of an helloworld example application
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*/
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#include <nanogui/opengl.h>
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#include <nanogui/screen.h>
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#include <nanogui/window.h>
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#include <nanogui/layout.h>
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#include <nanogui/label.h>
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#include <nanogui/button.h>
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#include <iostream>
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using namespace nanogui;
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class HelloWorldApplication : public Screen {
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public:
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HelloWorldApplication() : Screen(Vector2i(400, 300), "NanoGUI Hello World") {
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inc_ref();
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window = new Window(this, "Demo Window");
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window->set_layout(new BoxLayout(Orientation::Vertical, Alignment::Middle, 20, 20));
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resize_event(size());
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new Label(window, "NanoGUI Demo", "sans-bold");
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Button *b = new Button(window, "Say hello!");
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b->set_callback([] { std::cout << "Well, 'ello there!" << std::endl; });
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b->set_tooltip("Push me!");
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perform_layout();
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}
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virtual bool resize_event(const Vector2i &size) {
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window->set_fixed_size(size);
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window->set_size(size);
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window->center();
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window->perform_layout(nvg_context());
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return true;
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}
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virtual bool keyboard_event(int key, int scancode, int action, int modifiers) {
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if (Screen::keyboard_event(key, scancode, action, modifiers))
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return true;
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if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS) {
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set_visible(false);
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return true;
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}
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return false;
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}
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virtual void draw(NVGcontext *ctx) {
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/* Draw the user interface */
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Screen::draw(ctx);
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}
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private:
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Window *window;
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};
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int main(int /* argc */, char ** /* argv */) {
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try {
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nanogui::init();
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/* scoped variables */ {
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ref<HelloWorldApplication> app = new HelloWorldApplication();
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app->dec_ref();
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app->draw_all();
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app->set_visible(true);
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nanogui::mainloop(1 / 60.f * 1000);
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}
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nanogui::shutdown();
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} catch (const std::exception &e) {
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std::string error_msg = std::string("Caught a fatal error: ") + std::string(e.what());
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#if defined(_WIN32)
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MessageBoxA(nullptr, error_msg.c_str(), NULL, MB_ICONERROR | MB_OK);
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#else
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std::cerr << error_msg << std::endl;
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#endif
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return -1;
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} catch (...) {
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std::cerr << "Caught an unknown error!" << std::endl;
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}
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return 0;
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}
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