ClassiCube/ClassicalSharp/2D/Screens/ClickableScreen.cs

// Copyright 2014-2017 ClassicalSharp | Licensed under BSD-3
using System;
using System.Drawing;
using ClassicalSharp.Gui.Widgets;
using OpenTK.Input;

namespace ClassicalSharp.Gui.Screens {
	public abstract class ClickableScreen : Screen {
		
		public ClickableScreen(Game game) : base(game) {
		}
		
		protected bool HandleMouseClick(Widget[] widgets, int mouseX, int mouseY, MouseButton button) {
			// iterate backwards (because last elements rendered are shown over others)
			for (int i = widgets.Length - 1; i >= 0; i--) {
				Widget widget = widgets[i];
				if (widget != null && widget.Bounds.Contains(mouseX, mouseY)) {
					if (widget.OnClick != null && !widget.Disabled)
						widget.OnClick(game, widget, button, mouseX, mouseY);
					return true;
				}
			}
			return false;
		}
		
		int lastX = -1, lastY = -1;
		protected bool HandleMouseMove(Widget[] widgets, int mouseX, int mouseY) {
			if (lastX == mouseX && lastY == mouseY)
				return true;
			for (int i = 0; i < widgets.Length; i++) {
				if (widgets[i] == null || !widgets[i].Active) continue;
				widgets[i].Active = false;
			}
			
			for (int i = widgets.Length - 1; i >= 0; i--) {
				Widget widget = widgets[i];
				if (widget != null && widget.Bounds.Contains(mouseX, mouseY)) {
					widget.Active = true;
					lastX = mouseX; lastY = mouseY;
					WidgetSelected(widget);
					return true;
				}
			}
			lastX = mouseX; lastY = mouseY;
			WidgetSelected(null);
			return false;
		}
		
		protected virtual void WidgetSelected(Widget widget) {
		}
		
		protected ButtonWidget MakeBack(bool toGame, Font font, SimpleClickHandler onClick) {
			return MakeBack(200, toGame ? "Back to game" : "Back to menu", 25, font, onClick);
		}
		
		protected ButtonWidget MakeBack(int width, string text, int y, Font font, SimpleClickHandler onClick) {
			return ButtonWidget.Create(game, width, text, font, LeftOnly(onClick))
				.SetLocation(Anchor.Centre, Anchor.BottomOrRight, 0, y);
		}
	}
}