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gui.py
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gui.py
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#Snaildash is a small game created in the scope of a school project
#Copyright (C) 2022 Louis HEREDERO & Mathéo BENEY
import json
import os
import time
import pygame
from font_manager import FontManager
class GUI:
"""Class managing menus"""
MENUS = ["main", "waiting", "credits", "breakdown", "tutorial", "nameinput"]
def __init__(self):
"""Initializes a GUI instance"""
self.menus = {}
self._menu = self.MENUS[0]
self.visible = True
self.load_menus()
def load_menus(self):
"""Loads all menu files"""
for m in self.MENUS:
with open(os.path.join("assets", "menus", f"{m}.json"), "r", encoding="utf-8") as f:
self.menus[m] = Menu(json.load(f))
def render(self, surf):
"""Renders the active menu
Args:
surf (pygame.Surface): window surface
"""
if self.visible:
self.get_menu().render(surf)
def get_menu(self):
"""Gets the active menu
Returns:
Menu: active menu
"""
return self.menus[self._menu]
def set_menu(self, menu):
"""Sets the active menu
Args:
menu (str): new active menu name
"""
self._menu = menu
def on_mouse_down(self, event):
"""Handles a pygame.MOUSEBUTTONDOWN event
Args:
event (pygame.EVENT): the pygame event
"""
if not self.visible: return
if event.button == 1:
self.get_menu().on_mouse_down(event)
def on_mouse_up(self, event):
"""Handles a pygame.MOUSEBUTTONUP event
Args:
event (pygame.EVENT): the pygame event
"""
if not self.visible: return
if event.button == 1:
self.get_menu().on_mouse_up(event)
def on_key_down(self, event):
if not self.visible: return
self.get_menu().on_key_down(event)
class Menu:
"""Class representing a menu, composed of texts and buttons"""
def __init__(self, data):
"""Initializes a Menu instance
Args:
data (list[dict]): list of components
"""
self.width, self.height = 0, 0
self.components = []
for c in data:
type_ = c["type"]
if type_ == "button":
cls = Button
elif type_ == "text":
cls = Text
elif type_ == "input":
cls = Input
else:
continue
self.components.append(cls(self, **c))
def render(self, surf):
"""Renders this menu
Args:
surf (pygame.Surface): window surface
"""
self.width, self.height = surf.get_size()
for c in self.components:
c.render(surf)
def on_mouse_down(self, event):
"""Handles a pygame.MOUSEBUTTONDOWN event
Args:
event (pygame.EVENT): the pygame event
"""
for c in self.components:
if not isinstance(c, Button): continue
if not c.visible: continue
x,y,w,h = c.rect
if x <= event.pos[0] < x+w and y <= event.pos[1] < y+h:
c.pressed = True
break
def on_mouse_up(self, event):
"""Handles a pygame.MOUSEBUTTONDOWN event
Args:
event (pygame.EVENT): the pygame event
"""
for c in self.components:
if not isinstance(c, Button): continue
if not c.visible: continue
x,y,w,h = c.rect
if x <= event.pos[0] < x+w and y <= event.pos[1] < y+h:
if c.pressed:
pygame.event.post(pygame.event.Event(pygame.USEREVENT+1, name=c.name))
c.pressed = False
def on_key_down(self, event):
for c in self.components:
if not isinstance(c, Input): continue
if not c.visible: continue
c.handle_event(event)
class Button:
"""Class representing a clickable button"""
COLOR = (133, 255, 255)
TXT_COLOR = (0, 0, 0)
def __init__(self, menu, x, y, txt="", name="", width=1, margin=None, pos="relative", color=TXT_COLOR, bg=COLOR, **kwargs):
"""Initializes a Button instance
Args:
menu (Menu): parent menu
x (float): x position factor
y (float): y position factor
txt (str, optional): displayed text. Defaults to "".
name (str, optional): named passed when the button is clicked. Defaults to "".
width (float, optional): width factor. Defaults to 1.
margin (int, optional): if not None, margin in pixels and overrides width. Defaults to None.
pos (str, optional): type of positioning. Either "relative" or "absolute". Defaults to "relative".
color (tuple[int, int, int], optional): text color. Defaults to TXT_COLOR.
bg (tuple[int, int, int], optional): background color. Defaults to COLOR.
"""
self.menu = menu
self.x = x
self.y = y
self.txt = txt
self.name = name
self.width = width
self.margin = margin
self.pos = pos
self.rect = [0,0,0,0]
self.pressed = False
self.color = color
self.bg = bg
self.visible = True
def render(self, surf):
"""Renders this button
Args:
surf (pygame.Surface): window surface
"""
if not self.visible: return
font = FontManager.get("arial", 30)
txt = font.render(self.txt, True, self.color)
width = self.menu.width*self.width
height = txt.get_height()+20
if self.margin is not None:
width = txt.get_width()+2*self.margin
height = txt.get_height()+self.margin
if self.pos == "relative":
x = self.menu.width*self.x - width/2
y = self.menu.height*self.y - height/2
elif self.pos == "absolute":
x = self.x if self.x >= 0 else self.menu.width+self.x-width
y = self.y if self.y >= 0 else self.menu.height+self.y-height
else:
return
self.rect = [x, y, width, height]
pygame.draw.rect(surf, self.bg, self.rect)
surf.blit(txt, [x+width/2-txt.get_width()/2, y+height/2-txt.get_height()/2])
class Text:
"""Class representing a text element"""
COLOR = (255, 255, 255)
def __init__(self, menu, x, y, txt="", font_family="arial", size=30, align="center", bold=False, color=COLOR, **kwargs):
"""Initializes a Text instance
Args:
menu (Menu): parent menu
x (float): x position factor
y (float): y position facor
txt (str, optional): text content. Defaults to "".
font_family (str, optional): font family. Defaults to "arial".
size (int, optional): font size. Defaults to 30.
align (str, optional): text alignment. One of: "left", "center" or "right". Defaults to "center".
bold (bool, optional): whether the text is bold. Defaults to False.
color (tuple[int, int, int], optional): text color. Defaults to COLOR.
"""
self.menu = menu
self.x = x
self.y = y
self.txt = txt
self.font = FontManager.get(font_family, size, bold=bold)
self.align = align
self.color = color
def render(self, surf):
"""Renders this text
Args:
surf (pygame.Surface): window surface
"""
txt = self.font.render(self.txt, True, self.color)
x = self.menu.width*self.x
y = self.menu.height*self.y
y = y-txt.get_height()/2
if self.align == "right":
x -= txt.get_width()
elif self.align == "center":
x -= txt.get_width()/2
surf.blit(txt, [x, y])
class Input:
"""Class representing an input element"""
COLOR = (255, 255, 255)
VALID = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_-"
def __init__(self, menu, x, y, txt="", font_family="arial", size=30, align="center", color=COLOR, maxlen=10, width=0.3, height=0.1, **kwargs):
"""Initializes an Input instance
Args:
menu (Menu): parent menu
x (float): x position factor
y (float): y position facor
txt (str, optional): text content. Defaults to "".
font_family (str, optional): font family. Defaults to "arial".
size (int, optional): font size. Defaults to 30.
align (str, optional): text alignment. One of: "left", "center" or "right". Defaults to "center".
bold (bool, optional): whether the text is bold. Defaults to False.
color (tuple[int, int, int], optional): text color. Defaults to COLOR.
"""
self.menu = menu
self.x = x
self.y = y
self.txt = txt
self.font = FontManager.get(font_family, size)
self.align = align
self.color = color
self.maxlen = maxlen
self.width = width
self.height = height
self.visible = True
def render(self, surf):
"""Renders this text
Args:
surf (pygame.Surface): window surface
"""
txt = self.font.render(self.txt, True, self.color)
x = self.menu.width*self.x
y = self.menu.height*self.y
bx = x - self.width*self.menu.width/2
by = y - self.height*self.menu.height/2
y = y-txt.get_height()/2
if self.align == "right":
x -= txt.get_width()
elif self.align == "center":
x -= txt.get_width()/2
pygame.draw.rect(surf, self.color, (bx, by, self.width*self.menu.width, self.height*self.menu.height), width = 2)
surf.blit(txt, [x, y])
if int(time.time()*2)%2 == 0:
pygame.draw.rect(surf, self.color, [x + txt.get_width(), y, 3, txt.get_height()])
def handle_event(self, event):
"""Handles a pygame.KEYDOWN event
Args:
event (pygame.EVENT): the pygame event
"""
if event.key == pygame.K_BACKSPACE:
self.set_txt(self.txt[:-1])
elif event.unicode in self.VALID:
self.set_txt(self.txt + event.unicode)
def set_txt(self, txt):
"""Sets the current text
Args:
txt (str): new text
"""
if len(txt) > self.maxlen:
txt = txt[:10]
self.txt = txt