C++ window::get_canvas方法代码示例

void outro::draw_callback(window& window)
{
	if(SDL_GetTicks() < next_draw_) {
		return;
	}

	/* If we've faded fully in...
	 *
	 * NOTE: we want fading to take around half a second. Given this function runs about every 3 frames, we
	 * limit ourselves to a reasonable 10 fade steps with an alpha difference (rounded up) of 25.5 each cycle.
	 * The actual calculation for alpha is done in the window definition in WFL.
	 */
	if(fading_in_ && fade_step_ > 10) {
		// Schedule the fadeout after the provided delay.
		if(timer_id_ == 0) {
			timer_id_ = add_timer(duration_, [this](size_t) { fading_in_ = false; });
		}

		return;
	}

	// If we've faded fully out...
	if(!fading_in_ && fade_step_ < 0) {
		window.close();
		return;
	}

	canvas& window_canvas = window.get_canvas(0);

	window_canvas.set_variable("fade_step", wfl::variant(fade_step_));
	window_canvas.set_is_dirty(true);

	window.set_is_dirty(true);

	if(fading_in_) {
		fade_step_ ++;
	} else {
		fade_step_ --;
	}

	set_next_draw();
}

void title_screen::pre_show(window& win)
{
	win.set_click_dismiss(false);
	win.set_enter_disabled(true);
	win.set_escape_disabled(true);

	// Each time the dialog shows, we set this to false
	redraw_background_ = false;

#ifdef DEBUG_TOOLTIP
	win.connect_signal<event::SDL_MOUSE_MOTION>(
			std::bind(debug_tooltip, std::ref(win), _3, _5),
			event::dispatcher::front_child);
#endif

	win.connect_signal<event::SDL_VIDEO_RESIZE>(std::bind(&title_screen::on_resize, this, std::ref(win)));

	//
	// General hotkeys
	//
	win.register_hotkey(hotkey::TITLE_SCREEN__RELOAD_WML, [](event::dispatcher& w, hotkey::HOTKEY_COMMAND) {
		dynamic_cast<window&>(w).set_retval(RELOAD_GAME_DATA);
		return true;
	});

	win.register_hotkey(hotkey::HOTKEY_FULLSCREEN, std::bind(fullscreen, std::ref(win.video())));
	win.register_hotkey(hotkey::LUA_CONSOLE, std::bind(&launch_lua_console, std::ref(win)));

	//
	// Background and logo images
	//
	if(game_config::images::game_title.empty()) {
		ERR_CF << "No title image defined" << std::endl;
	} 

	win.get_canvas()[0].set_variable("title_image", variant(game_config::images::game_title));

	if(game_config::images::game_title_background.empty()) {
		ERR_CF << "No title background image defined" << std::endl;
	}

	win.get_canvas()[0].set_variable("background_image", variant(game_config::images::game_title_background));

	find_widget<image>(&win, "logo-bg", false).set_image(game_config::images::game_logo_background);
	find_widget<image>(&win, "logo", false).set_image(game_config::images::game_logo);

	//
	// Version string
	//
	const std::string version_string = formatter() << ("Version") << " " << game_config::revision;

	if(label* version_label = find_widget<label>(&win, "revision_number", false, false)) {
		version_label->set_label(version_string);
	}

	win.get_canvas()[0].set_variable("revision_number", variant(version_string));

	//
	// Tip-of-the-day browser
	//
	multi_page& tip_pages = find_widget<multi_page>(&win, "tips", false);

	std::vector<game_tip> tips(settings::get_tips());
	if(tips.empty()) {
		WRN_CF << "There are no tips of day available." << std::endl;
	}

	for(const auto& tip : tips)	{
		string_map widget;
		std::map<std::string, string_map> page;

		widget["use_markup"] = "true";

		widget["label"] = tip.text();
		page.emplace("tip", widget);

		widget["label"] = tip.source();
		page.emplace("source", widget);

		tip_pages.add_page(page);
	}

	update_tip(win, true);

	register_button(win, "next_tip", hotkey::TITLE_SCREEN__NEXT_TIP,
		std::bind(&title_screen::update_tip, this, std::ref(win), true));
	register_button(win, "previous_tip", hotkey::TITLE_SCREEN__PREVIOUS_TIP,
		std::bind(&title_screen::update_tip, this, std::ref(win), false));

	//
	// Help
	//
	register_button(win, "help", hotkey::HOTKEY_HELP, [this](window&) {
		help::help_manager help_manager(&game_config_manager::get()->game_config());
		help::show_help(game_.video());
	});

	//
	// About
	//
//.........这里部分代码省略.........