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.venv/lib/python3.8/site-packages/pygame/examples/textinput.py

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+#!/usr/bin/env python
+""" pg.examples.textinput
+
+A little "console" where you can write in text.
+
+Shows how to use the TEXTEDITING and TEXTINPUT events.
+"""
+import sys
+import pygame as pg
+import pygame.freetype as freetype
+
+# Version check
+if pg.get_sdl_version() < (2, 0, 0):
+    raise Exception("This example requires pygame 2.")
+
+###CONSTS
+# Set to true or add 'showevent' in argv to see IME and KEYDOWN events
+PRINT_EVENT = False
+# frames per second, the general speed of the program
+FPS = 50
+# size of window
+WINDOWWIDTH, WINDOWHEIGHT = 640, 480
+BGCOLOR = (0, 0, 0)
+
+# position of chatlist and chatbox
+CHATLIST_POS = pg.Rect(0, 20, WINDOWWIDTH, 400)
+CHATBOX_POS = pg.Rect(0, 440, WINDOWWIDTH, 40)
+CHATLIST_MAXSIZE = 20
+
+TEXTCOLOR = (0, 255, 0)
+
+# Add fontname for each language, otherwise some text can't be correctly displayed.
+FONTNAMES = [
+    "notosanscjktcregular",
+    "notosansmonocjktcregular",
+    "notosansregular,",
+    "microsoftjhengheimicrosoftjhengheiuilight",
+    "microsoftyaheimicrosoftyaheiuilight",
+    "msgothicmsuigothicmspgothic",
+    "msmincho",
+    "Arial",
+]
+
+# Initalize
+pg.init()
+Screen = pg.display.set_mode((WINDOWWIDTH, WINDOWHEIGHT))
+pg.display.set_caption("TextInput example")
+FPSClock = pg.time.Clock()
+
+# Freetype
+# "The font name can be a comma separated list of font names to search for."
+FONTNAMES = ",".join(str(x) for x in FONTNAMES)
+Font = freetype.SysFont(FONTNAMES, 24)
+FontSmall = freetype.SysFont(FONTNAMES, 16)
+print("Using font: " + Font.name)
+
+# Main loop process
+def main():
+    global BGCOLOR, PRINT_EVENT, CHATBOX_POS, CHATLIST_POS, CHATLIST_MAXSIZE
+    global FPSClock, Font, Screen
+
+    """
+    https://wiki.libsdl.org/SDL_HINT_IME_INTERNAL_EDITING
+    https://wiki.libsdl.org/Tutorials/TextInput
+    Candidate list not showing due to SDL2 problem ;w;
+    """
+    pg.key.start_text_input()
+    input_rect = pg.Rect(80, 80, 320, 40)
+    pg.key.set_text_input_rect(input_rect)
+
+    _IMEEditing = False
+    _IMEText = ""
+    _IMETextPos = 0
+    _IMEEditingText = ""
+    _IMEEditingPos = 0
+    ChatList = []
+
+    while True:
+        for event in pg.event.get():
+            if event.type == pg.QUIT:
+                pg.quit()
+                return
+
+            elif event.type == pg.KEYDOWN:
+                if PRINT_EVENT:
+                    print(event)
+
+                if _IMEEditing:
+                    if len(_IMEEditingText) == 0:
+                        _IMEEditing = False
+                    continue
+
+                if event.key == pg.K_BACKSPACE:
+                    if len(_IMEText) > 0 and _IMETextPos > 0:
+                        _IMEText = (
+                            _IMEText[0 : _IMETextPos - 1] + _IMEText[_IMETextPos:]
+                        )
+                        _IMETextPos = max(0, _IMETextPos - 1)
+
+                elif event.key == pg.K_DELETE:
+                    _IMEText = _IMEText[0:_IMETextPos] + _IMEText[_IMETextPos + 1 :]
+                elif event.key == pg.K_LEFT:
+                    _IMETextPos = max(0, _IMETextPos - 1)
+                elif event.key == pg.K_RIGHT:
+                    _IMETextPos = min(len(_IMEText), _IMETextPos + 1)
+                # Handle ENTER key
+                elif event.key in [pg.K_RETURN, pg.K_KP_ENTER]:
+                    # Block if we have no text to append
+                    if len(_IMEText) == 0:
+                        continue
+
+                    # Append chat list
+                    ChatList.append(_IMEText)
+                    if len(ChatList) > CHATLIST_MAXSIZE:
+                        ChatList.pop(0)
+                    _IMEText = ""
+                    _IMETextPos = 0
+
+            elif event.type == pg.TEXTEDITING:
+                if PRINT_EVENT:
+                    print(event)
+                _IMEEditing = True
+                _IMEEditingText = event.text
+                _IMEEditingPos = event.start
+
+            elif event.type == pg.TEXTINPUT:
+                if PRINT_EVENT:
+                    print(event)
+                _IMEEditing = False
+                _IMEEditingText = ""
+                _IMEText = _IMEText[0:_IMETextPos] + event.text + _IMEText[_IMETextPos:]
+                _IMETextPos += len(event.text)
+
+        # Screen updates
+        Screen.fill(BGCOLOR)
+
+        # Chat List updates
+        chat_height = CHATLIST_POS.height / CHATLIST_MAXSIZE
+        for i, chat in enumerate(ChatList):
+            FontSmall.render_to(
+                Screen,
+                (CHATLIST_POS.x, CHATLIST_POS.y + i * chat_height),
+                chat,
+                TEXTCOLOR,
+            )
+
+        # Chat box updates
+        start_pos = CHATBOX_POS.copy()
+        ime_textL = ">" + _IMEText[0:_IMETextPos]
+        ime_textM = (
+            _IMEEditingText[0:_IMEEditingPos] + "|" + _IMEEditingText[_IMEEditingPos:]
+        )
+        ime_textR = _IMEText[_IMETextPos:]
+
+        rect_textL = Font.render_to(Screen, start_pos, ime_textL, TEXTCOLOR)
+        start_pos.x += rect_textL.width
+
+        # Editing texts should be underlined
+        rect_textM = Font.render_to(
+            Screen, start_pos, ime_textM, TEXTCOLOR, None, freetype.STYLE_UNDERLINE
+        )
+        start_pos.x += rect_textM.width
+        Font.render_to(Screen, start_pos, ime_textR, TEXTCOLOR)
+
+        pg.display.update()
+
+        FPSClock.tick(FPS)
+
+
+if __name__ == "__main__":
+    if "showevent" in sys.argv:
+        PRINT_EVENT = True
+
+    main()