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https://github.com/OpenRCT2/OpenRCT2
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Move more platform code to UiContext
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Ted John
300
src/openrct2-ui/TextComposition.cpp
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300
src/openrct2-ui/TextComposition.cpp
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#pragma region Copyright (c) 2014-2016 OpenRCT2 Developers
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/*****************************************************************************
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* OpenRCT2, an open source clone of Roller Coaster Tycoon 2.
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*
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* OpenRCT2 is the work of many authors, a full list can be found in contributors.md
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* For more information, visit https://github.com/OpenRCT2/OpenRCT2
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*
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* OpenRCT2 is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* A full copy of the GNU General Public License can be found in licence.txt
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*****************************************************************************/
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#pragma endregion
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#include <openrct2/common.h>
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#include <SDL.h>
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#include <openrct2/core/Math.hpp>
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#include <openrct2/core/Memory.hpp>
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#include <openrct2/core/String.hpp>
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#include <openrct2/localisation/localisation.h>
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#include "TextComposition.h"
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extern "C"
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{
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#include <openrct2/interface/console.h>
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#include <openrct2/interface/window.h>
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}
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#ifdef __MACOSX__
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// macOS uses COMMAND rather than CTRL for many keyboard shortcuts
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#define KEYBOARD_PRIMARY_MODIFIER KMOD_GUI
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#else
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#define KEYBOARD_PRIMARY_MODIFIER KMOD_CTRL
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#endif
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using namespace OpenRCT2;
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using namespace OpenRCT2::Ui;
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bool TextComposition::IsActive()
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{
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return SDL_IsTextInputActive() && _session.Buffer != nullptr;
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}
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const TextInputSession * TextComposition::Start(utf8 * buffer, size_t bufferSize)
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{
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Guard::ArgumentNotNull(buffer);
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// TODO This doesn't work, and position could be improved to where text entry is
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SDL_Rect rect = { 10, 10, 100, 100 };
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SDL_SetTextInputRect(&rect);
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SDL_StartTextInput();
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_session.Buffer = buffer;
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_session.BufferSize = bufferSize - 1;
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_session.Size = strlen(buffer);
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_session.SelectionStart = _session.Size;
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_session.SelectionSize = 0;
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RecalculateLength();
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return &_session;
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}
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void TextComposition::Stop()
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{
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SDL_StopTextInput();
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_session.Buffer = nullptr;
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_imeActive = false;
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}
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void TextComposition::HandleMessage(const SDL_Event * e)
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{
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switch (e->type) {
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case SDL_TEXTEDITING:
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// When inputting Korean characters, `edit.length` is always zero
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String::Set(_imeBuffer, sizeof(_imeBuffer), e->edit.text);
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_imeStart = e->edit.start;
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_imeLength = e->edit.length;
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_imeActive = ((e->edit.length != 0 || String::SizeOf(e->edit.text) != 0) && _imeBuffer[0] != '\0');
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break;
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case SDL_TEXTINPUT:
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// will receive an `SDL_TEXTINPUT` event when a composition is committed
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_imeActive = false;
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if (_session.Buffer != nullptr)
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{
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// HACK ` will close console, so don't input any text
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if (e->text.text[0] == '`' && gConsoleOpen) {
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break;
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}
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utf8 * newText = String::Duplicate(e->text.text);
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utf8_remove_formatting(newText, false);
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Insert(newText);
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Memory::Free(newText);
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console_refresh_caret();
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window_update_textbox();
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}
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break;
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case SDL_KEYDOWN:
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{
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if (_imeActive)
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{
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break;
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}
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uint16 modifier = e->key.keysym.mod;
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SDL_Keycode key = e->key.keysym.sym;
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if (key == SDLK_KP_ENTER)
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{
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// Map Keypad enter to regular enter.
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key = SDLK_RETURN;
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}
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// _lastKeyPressed = e.key.keysym.sym;
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// _keysPressed[e.key.keysym.scancode] = 1;
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// Text input
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if (_session.Buffer == nullptr)
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{
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break;
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}
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// Clear the input on <CTRL>Backspace (Windows/Linux) or <MOD>Backspace (macOS)
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if (key == SDLK_BACKSPACE && (modifier & KEYBOARD_PRIMARY_MODIFIER))
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{
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Clear();
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console_refresh_caret();
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window_update_textbox();
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}
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switch (key) {
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case SDLK_BACKSPACE:
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// If backspace and we have input text with a cursor position none zero
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if (_session.SelectionStart > 0)
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{
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size_t endOffset = _session.SelectionStart;
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CursorLeft();
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_session.SelectionSize = endOffset - _session.SelectionStart;
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Delete();
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console_refresh_caret();
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window_update_textbox();
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}
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break;
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case SDLK_HOME:
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CursorHome();
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console_refresh_caret();
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break;
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case SDLK_END:
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CursorEnd();
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console_refresh_caret();
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break;
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case SDLK_DELETE:
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{
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size_t startOffset = _session.SelectionStart;
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CursorRight();
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_session.SelectionSize = _session.SelectionStart - startOffset;
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_session.SelectionStart = startOffset;
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Delete();
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console_refresh_caret();
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window_update_textbox();
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break;
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}
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case SDLK_RETURN:
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window_cancel_textbox();
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break;
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case SDLK_LEFT:
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CursorLeft();
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console_refresh_caret();
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break;
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case SDLK_RIGHT:
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CursorRight();
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console_refresh_caret();
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break;
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case SDLK_v:
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if ((modifier & KEYBOARD_PRIMARY_MODIFIER) && SDL_HasClipboardText())
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{
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utf8 * text = SDL_GetClipboardText();
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utf8_remove_formatting(text, false);
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Insert(text);
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SDL_free(text);
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window_update_textbox();
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}
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break;
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}
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}
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}
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}
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void TextComposition::CursorHome()
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{
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_session.SelectionStart = 0;
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}
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void TextComposition::CursorEnd()
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{
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_session.SelectionStart = _session.SelectionSize;
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}
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void TextComposition::CursorLeft()
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{
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size_t selectionOffset = _session.SelectionStart;
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if (selectionOffset > 0)
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{
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const utf8 * ch = _session.Buffer + selectionOffset;
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do
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{
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ch--;
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selectionOffset--;
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}
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while (!utf8_is_codepoint_start(ch) && selectionOffset > 0);
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_session.SelectionStart = selectionOffset;
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}
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}
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void TextComposition::CursorRight()
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{
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size_t selectionOffset = _session.SelectionStart;
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size_t selectionMaxOffset = _session.Size;
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if (selectionOffset < selectionMaxOffset)
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{
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const utf8 * ch = _session.Buffer + _session.SelectionStart;
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do
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{
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ch++;
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selectionOffset++;
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}
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while (!utf8_is_codepoint_start(ch) && selectionOffset < selectionMaxOffset);
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_session.SelectionSize = Math::Max<size_t>(0, _session.SelectionSize - (selectionOffset - _session.SelectionStart));
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_session.SelectionStart = selectionOffset;
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}
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}
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void TextComposition::Insert(const utf8 * text)
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{
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const utf8 * ch = text;
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uint32 codepoint;
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while ((codepoint = utf8_get_next(ch, &ch)) != 0)
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{
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InsertCodepoint(codepoint);
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}
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}
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void TextComposition::InsertCodepoint(codepoint_t codepoint)
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{
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size_t codepointLength = utf8_get_codepoint_length(codepoint);
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size_t remainingSize = _session.BufferSize - _session.Size;
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if (codepointLength <= remainingSize)
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{
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utf8 * buffer = (utf8 *)_session.Buffer;
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utf8 * insertPtr = buffer + _session.SelectionStart;
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if (_session.SelectionStart < _session.Size)
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{
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// Shift bytes (including null terminator) right to make room for new codepoint
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utf8 * targetShiftPtr = insertPtr + codepointLength;
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size_t shiftSize = _session.Size - _session.SelectionStart + 1;
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memmove(targetShiftPtr, insertPtr, shiftSize);
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}
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else
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{
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// Character is appended onto the end, so set byte after it to null terminator
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buffer[_session.Size + codepointLength] = 0;
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}
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utf8_write_codepoint(insertPtr, codepoint);
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_session.SelectionStart += codepointLength;
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_session.Size += codepointLength;
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_session.Length++;
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}
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}
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void TextComposition::Clear()
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{
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utf8 * buffer = (utf8 *)_session.Buffer;
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buffer[0] = 0;
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_session.Size = 0;
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_session.Length = 0;
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_session.SelectionStart = 0;
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_session.SelectionSize = 0;
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}
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void TextComposition::Delete()
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{
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utf8 * buffer = (utf8 *)_session.Buffer;
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utf8 * targetShiftPtr = buffer + _session.SelectionStart;
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utf8 * sourceShiftPtr = targetShiftPtr + _session.SelectionSize;
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size_t shiftSize = _session.SelectionSize - _session.SelectionStart - _session.SelectionSize + 1;
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memmove(targetShiftPtr, sourceShiftPtr, shiftSize);
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_session.SelectionSize = 0;
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RecalculateLength();
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}
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void TextComposition::RecalculateLength()
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{
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_session.Size = String::SizeOf(_session.Buffer);
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_session.Length = String::LengthOf(_session.Buffer);
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}
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