pygame_minimal_text_paragraph_input.py

# pygame.font module
# https://www.pygame.org/docs/ref/font.html
#
# Text with a Drop-shadow
# https://stackoverflow.com/questions/52960057/pygame-text-with-a-drop-shadow/73927438#73927438
#
# GitHub - PyGameExamplesAndAnswers - Text and font - Text
# https://github.com/Rabbid76/PyGameExamplesAndAnswers/blob/master/documentation/pygame/pygame_text_and_font.md

import pygame 

textAlignLeft = 0
textAlignRight = 1
textAlignCenter = 2
textAlignBlock = 3

def drawText(surface, text, color, rect, font, align=textAlignLeft, aa=False, bkg=None):
    lineSpacing = -2
    spaceWidth, fontHeight = font.size(" ")[0], font.size("Tg")[1]

    listOfWords = text.split(" ")
    if bkg:
        imageList = [font.render(word, 1, color, bkg) for word in listOfWords]
        for image in imageList: image.set_colorkey(bkg)
    else:
        imageList = [font.render(word, aa, color) for word in listOfWords]

    maxLen = rect[2]
    lineLenList = [0]
    lineList = [[]]
    for image in imageList:
        width = image.get_width()
        lineLen = lineLenList[-1] + len(lineList[-1]) * spaceWidth + width
        if len(lineList[-1]) == 0 or lineLen <= maxLen:
            lineLenList[-1] += width
            lineList[-1].append(image)
        else:
            lineLenList.append(width)
            lineList.append([image])

    lineBottom = rect[1]
    lastLine = 0
    for lineLen, lineImages in zip(lineLenList, lineList):
        lineLeft = rect[0]
        if align == textAlignRight:
            lineLeft += + rect[2] - lineLen - spaceWidth * (len(lineImages)-1)
        elif align == textAlignCenter:
            lineLeft += (rect[2] - lineLen - spaceWidth * (len(lineImages)-1)) // 2
        elif align == textAlignBlock and len(lineImages) > 1:
            spaceWidth = (rect[2] - lineLen) // (len(lineImages)-1)
        if lineBottom + fontHeight > rect[1] + rect[3]:
            break
        lastLine += 1
        for i, image in enumerate(lineImages):
            x, y = lineLeft + i*spaceWidth, lineBottom
            surface.blit(image, (round(x), y))
            lineLeft += image.get_width() 
        lineBottom += fontHeight + lineSpacing

    if lastLine < len(lineList):
        drawWords = sum([len(lineList[i]) for i in range(lastLine)])
        remainingText = ""
        for text in listOfWords[drawWords:]: remainingText += text + " "
        return remainingText
    return ""

class InputBox():
    def __init__(self, max_len, x, y, width, height, text = ''):
        self.color = inactive_color
        self.len = max_len
        self.rect = pygame.Rect(x,y,width,height)
        self.text = text 
        self.text_surf = font.render(text,True,self.color)
        self.active = False

    def event_handler(self,event):
        if event.type == pygame.MOUSEBUTTONDOWN:
            if self.rect.collidepoint(event.pos):
                self.active = not self.active 
            else:
                self.active = False
        self.color = active_color if self.active else inactive_color
    
        if event.type == pygame.KEYDOWN:
            if self.active:
                if event.key == pygame.K_RETURN:
                    self.text = ''
                elif event.key == pygame.K_BACKSPACE:
                    self.text = self.text[:-1]
                else:
                    self.text += event.unicode

    def draw(self,screen):
        pygame.draw.rect(screen, self.color, self.rect, 1)
        drawTextRect = self.rect.inflate(-5, -5)
        drawText(screen, self.text, self.color, drawTextRect, font, textAlignLeft, True)

    def update(self):
        pass

pygame.init()
window = pygame.display.set_mode((400, 300))
clock = pygame.time.Clock()
font = pygame.font.SysFont(None, 32)
active_color = pygame.Color('dodgerblue2')
inactive_color = pygame.Color('white')
        
inputbox = InputBox(15, 20, 20, 360, 260, 'The Quick Brown Fox Jumps Over The Lazy Dog.')

run = True
while run:
    clock.tick(60)
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False
        inputbox.event_handler(event)
    
    window.fill('black')        
    inputbox.update()
    inputbox.draw(window)
    pygame.display.update()

pygame.quit()
exit()