textfield.cpp

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/*
 * The ManaPlus Client
 * Copyright (C) 2004-2009 The Mana World Development Team
 * Copyright (C) 2009-2010 The Mana Developers
 * Copyright (C) 2011-2018 The ManaPlus Developers
 *
 * This file is part of The ManaPlus Client.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

/* _______ __ __ __ ______ __ __ _______ __ __
 * / _____/\ / /\ / /\ / /\ / ____/\ / /\ / /\ / ___ /\ / |\/ /\
 * / /\____\// / // / // / // /\___\// /_// / // /\_/ / // , |/ / /
 * / / /__ / / // / // / // / / / ___ / // ___ / // /| ' / /
 * / /_// /\ / /_// / // / // /_/_ / / // / // /\_/ / // / | / /
 * /______/ //______/ //_/ //_____/\ /_/ //_/ //_/ //_/ //_/ /|_/ /
 * \______\/ \______\/ \_\/ \_____\/ \_\/ \_\/ \_\/ \_\/ \_\/ \_\/
 *
 * Copyright (c) 2004 - 2008 Olof Naessén and Per Larsson
 *
 *
 * Per Larsson a.k.a finalman
 * Olof Naessén a.k.a jansem/yakslem
 *
 * Visit: http://guichan.sourceforge.net
 *
 * License: (BSD)
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in
 * the documentation and/or other materials provided with the
 * distribution.
 * 3. Neither the name of Guichan nor the names of its contributors may
 * be used to endorse or promote products derived from this software
 * without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "gui/widgets/textfield.h"

#include "settings.h"

#ifdef USE_SDL2
#include "enums/input/keyvalue.h"
#endif // USE_SDL2

#include "gui/gui.h"
#include "gui/skin.h"
#ifdef ANDROID
#include "gui/windowmanager.h"
#endif // ANDROID

#include "gui/fonts/font.h"

#include "gui/popups/popupmenu.h"

#include "input/inputmanager.h"

#include "utils/copynpaste.h"
#include "utils/stringutils.h"

#ifndef USE_SDL2
#include "utils/timer.h"
#endif // USE_SDL2

#include "render/graphics.h"

#include "resources/imagerect.h"

#include "resources/image/image.h"

#undef DELETE // Win32 compatibility hack

#include "debug.h"

Skin *TextField::mSkin;
int TextField::instances = 0;
float TextField::mAlpha = 1.0;
ImageRect TextField::skin;

TextField::TextField(const Widget2 *restrict const widget,
 const std::string &restrict text,
 const LoseFocusOnTab loseFocusOnTab,
 ActionListener *restrict const listener,
 const std::string &restrict eventId,
 const bool sendAlwaysEvents) :
 Widget(widget),
 FocusListener(),
 KeyListener(),
 MouseListener(),
 WidgetListener(),
 mText(text),
 mTextChunk(),
 mCaretPosition(0),
 mXScroll(0),
 mCaretColor(&getThemeColor(ThemeColorId::CARET, 255U)),
 mMinimum(0),
 mMaximum(0),
 mLastEventPaste(0),
 mPadding(1),
 mNumeric(false),
 mLoseFocusOnTab(loseFocusOnTab),
 mAllowSpecialActions(true),
 mSendAlwaysEvents(sendAlwaysEvents),
 mTextChanged(true)
{
 mAllowLogic = false;
 setFocusable(true);
 addMouseListener(this);
 addKeyListener(this);

 setFrameSize(2);
 mForegroundColor = getThemeColor(ThemeColorId::TEXTFIELD, 255U);
 mForegroundColor2 = getThemeColor(ThemeColorId::TEXTFIELD_OUTLINE, 255U);

 addFocusListener(this);

 if (instances == 0)
 {
 if (theme != nullptr)
 {
 mSkin = theme->loadSkinRect(skin,
 "textfield.xml",
 "textfield_background.xml",
 0,
 8);
 }
 }

 instances++;

 if (mSkin != nullptr)
 {
 mPadding = mSkin->getPadding();
 mFrameSize = mSkin->getOption("frameSize", 2);
 }

 adjustSize();
 if (!eventId.empty())
 setActionEventId(eventId);

 if (listener != nullptr)
 addActionListener(listener);
}

TextField::~TextField()
{
 if (mWindow != nullptr)
 mWindow->removeWidgetListener(this);

 if (gui != nullptr)
 gui->removeDragged(this);

 instances--;
 if (instances == 0)
 {
 if (theme != nullptr)
 {
 theme->unload(mSkin);
 Theme::unloadRect(skin, 0, 8);
 }
 }
 mTextChunk.deleteImage();
}

void TextField::updateAlpha()
{
 const float alpha = std::max(settings.guiAlpha,
 theme->getMinimumOpacity());

 if (alpha != mAlpha)
 {
 mAlpha = alpha;
 for (int a = 0; a < 9; a++)
 {
 if (skin.grid[a] != nullptr)
 skin.grid[a]->setAlpha(mAlpha);
 }
 }
}

void TextField::draw(Graphics *const graphics)
{
 BLOCK_START("TextField::draw")
 updateAlpha();

 Font *const font = getFont();
 if (isFocused())
 {
 drawCaret(graphics,
 font->getWidth(mText.substr(0, mCaretPosition)) - mXScroll);
 }

 if (mTextChanged)
 {
 mTextChunk.textFont = font;
 mTextChunk.deleteImage();
 mTextChunk.text = mText;
 mTextChunk.color = mForegroundColor;
 mTextChunk.color2 = mForegroundColor2;
 font->generate(mTextChunk);
 mTextChanged = false;
 }

 const Image *const image = mTextChunk.img;
 if (image != nullptr)
 graphics->drawImage(image, mPadding - mXScroll, mPadding);

 BLOCK_END("TextField::draw")
}

void TextField::safeDraw(Graphics *const graphics)
{
 TextField::draw(graphics);
}

void TextField::drawFrame(Graphics *const graphics)
{
 BLOCK_START("TextField::drawFrame")
 const int bs = 2 * mFrameSize;
 graphics->drawImageRect(0,
 0,
 mDimension.width + bs,
 mDimension.height + bs,
 skin);
 BLOCK_END("TextField::drawFrame")
}

void TextField::safeDrawFrame(Graphics *const graphics)
{
 BLOCK_START("TextField::drawFrame")
 const int bs = 2 * mFrameSize;
 graphics->drawImageRect(0,
 0,
 mDimension.width + bs,
 mDimension.height + bs,
 skin);
 BLOCK_END("TextField::drawFrame")
}

void TextField::setNumeric(const bool numeric)
{
 mNumeric = numeric;
 if (!numeric)
 return;

 const char *const text = mText.c_str();
 for (const char *textPtr = text; *textPtr != 0; ++textPtr)
 {
 if (*textPtr < '0' || *textPtr > '9')
 {
 setText(mText.substr(0, textPtr - text));
 return;
 }
 }
}

int TextField::getValue() const
{
 if (!mNumeric)
 return 0;

 const int value = atoi(mText.c_str());
 if (value < mMinimum)
 return mMinimum;

 if (value > mMaximum)
 return mMaximum;

 return value;
}

void TextField::keyPressed(KeyEvent &event)
{
 const int val = event.getKey().getValue();

#ifdef USE_SDL2
 if (val == KeyValue::TEXTINPUT)
 {
 std::string str = event.getText();
 mText.insert(mCaretPosition, str);
 mTextChanged = true;
 mCaretPosition += CAST_U32(str.size());
 event.consume();
 fixScroll();
 if (mSendAlwaysEvents)
 distributeActionEvent();
 return;
 }
 bool consumed(false);
#else // USE_SDL2

 if (val >= 32)
 {
 if (mNumeric)
 {
 if ((val >= '0' && val <= '9') ||
 (val == '-' && mCaretPosition == 0u))
 {
 char buf[2];
 buf[0] = CAST_8(val);
 buf[1] = 0;
 mText.insert(mCaretPosition, std::string(buf));
 mTextChanged = true;
 mCaretPosition += 1;
 event.consume();
 fixScroll();
 if (mSendAlwaysEvents)
 distributeActionEvent();
 return;
 }
 }
 else if ((mMaximum == 0) ||
 CAST_S32(mText.size()) < mMaximum)
 {
 int len;
 if (val < 128)
 len = 1; // 0xxxxxxx
 else if (val < 0x800)
 len = 2; // 110xxxxx 10xxxxxx
 else if (val < 0x10000)
 len = 3; // 1110xxxx 10xxxxxx 10xxxxxx
 else
 len = 4; // 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx

 char buf[4];
 for (int i = 0; i < len; ++ i)
 {
 buf[i] = CAST_8(val >> (6 * (len - i - 1)));
 if (i > 0)
 buf[i] = CAST_8((buf[i] & 63) | 128);
 }

 if (len > 1)
 buf[0] |= CAST_8(255U << (8 - len));

 mText.insert(mCaretPosition, std::string(buf, buf + len));
 mCaretPosition += len;
 mTextChanged = true;
 event.consume();
 fixScroll();
 if (mSendAlwaysEvents)
 distributeActionEvent();
 return;
 }
 }

 /* In UTF-8, 10xxxxxx is only used for inner parts of characters. So skip
 them when processing key presses. */

 // unblock past key
 if (val != 22)
 mLastEventPaste = 0;

 bool consumed(false);
#endif // USE_SDL2

 const InputActionT action = event.getActionId();
 if (!inputManager.isActionActive(InputAction::GUI_CTRL))
 {
 if (!handleNormalKeys(action, consumed))
 {
 if (consumed)
 event.consume();
 return;
 }
 }
 else
 {
 handleCtrlKeys(action, consumed);
 }

 if (mSendAlwaysEvents)
 distributeActionEvent();

 if (consumed)
 event.consume();
 fixScroll();
}

bool TextField::handleNormalKeys(const InputActionT action, bool &consumed)
{
 PRAGMA45(GCC diagnostic push)
 PRAGMA45(GCC diagnostic ignored "-Wswitch-enum")
 switch (action)
 {
 case InputAction::GUI_LEFT:
 {
 consumed = true;
 while (mCaretPosition > 0)
 {
 --mCaretPosition;
 if ((mText[mCaretPosition] & 192) != 128)
 break;
 }
 break;
 }

 case InputAction::GUI_RIGHT:
 {
 consumed = true;
 const unsigned sz = CAST_U32(mText.size());
 while (mCaretPosition < sz)
 {
 ++mCaretPosition;
 if (mCaretPosition == sz ||
 (mText[mCaretPosition] & 192) != 128)
 {
 break;
 }
 }
 break;
 }

 case InputAction::GUI_DELETE:
 {
 consumed = true;
 unsigned sz = CAST_U32(mText.size());
 while (mCaretPosition < sz)
 {
 --sz;
 mText.erase(mCaretPosition, 1);
 mTextChanged = true;
 if (mCaretPosition == sz ||
 (mText[mCaretPosition] & 192) != 128)
 {
 break;
 }
 }
 break;
 }

 case InputAction::GUI_BACKSPACE:
 consumed = true;
 deleteCharLeft(mText, &mCaretPosition);
 mTextChanged = true;
 break;

 case InputAction::GUI_SELECT2:
 distributeActionEvent();
 consumed = true;
 fixScroll();
 return false;

 case InputAction::GUI_HOME:
 mCaretPosition = 0;
 consumed = true;
 break;

 case InputAction::GUI_END:
 mCaretPosition = CAST_U32(mText.size());
 consumed = true;
 break;

 case InputAction::GUI_TAB:
 if (mLoseFocusOnTab == LoseFocusOnTab_true)
 return false;
 consumed = true;
 break;

 default:
 break;
 }
 PRAGMA45(GCC diagnostic pop)
 return true;
}

void TextField::handleCtrlKeys(const InputActionT action, bool &consumed)
{
 PRAGMA45(GCC diagnostic push)
 PRAGMA45(GCC diagnostic ignored "-Wswitch-enum")
 switch (action)
 {
 case InputAction::GUI_LEFT:
 {
 moveCaretWordBack();
 consumed = true;
 break;
 }
 case InputAction::GUI_RIGHT:
 {
 moveCaretWordForward();
 consumed = true;
 break;
 }
 case InputAction::GUI_B:
 {
 if (mAllowSpecialActions)
 {
 moveCaretBack();
 consumed = true;
 }
 break;
 }
 case InputAction::GUI_F:
 {
 moveCaretForward();
 consumed = true;
 break;
 }
 case InputAction::GUI_D:
 {
 caretDelete();
 consumed = true;
 break;
 }
 case InputAction::GUI_E:
 {
 mCaretPosition = CAST_S32(mText.size());
 consumed = true;
 break;
 }
 case InputAction::GUI_H:
 {
 deleteCharLeft(mText, &mCaretPosition);
 mTextChanged = true;
 consumed = true;
 break;
 }
 case InputAction::GUI_K:
 {
 mText = mText.substr(0, mCaretPosition);
 mTextChanged = true;
 consumed = true;
 break;
 }
 case InputAction::GUI_U:
 {
 caretDeleteToStart();
 consumed = true;
 break;
 }
 case InputAction::GUI_C:
 {
 handleCopy();
 consumed = true;
 break;
 }
 case InputAction::GUI_V:
 {
#ifdef USE_SDL2
 handlePaste();
#else // USE_SDL2

 // hack to prevent paste key sticking
 if ((mLastEventPaste != 0) && mLastEventPaste > cur_time)
 break;
 handlePaste();
 mLastEventPaste = cur_time + 2;
#endif // USE_SDL2

 consumed = true;
 break;
 }
 case InputAction::GUI_W:
 {
 caretDeleteWord();
 consumed = true;
 break;
 }
 default:
 break;
 }
 PRAGMA45(GCC diagnostic pop)
}

void TextField::moveCaretBack()
{
 while (mCaretPosition > 0)
 {
 --mCaretPosition;
 if ((mText[mCaretPosition] & 192) != 128)
 break;
 }
}

void TextField::moveCaretForward()
{
 const unsigned sz = CAST_U32(mText.size());
 while (mCaretPosition < sz)
 {
 ++mCaretPosition;
 if (mCaretPosition == sz || (mText[mCaretPosition] & 192) != 128)
 break;
 }
}

void TextField::caretDelete()
{
 unsigned sz = CAST_U32(mText.size());
 while (mCaretPosition < sz)
 {
 --sz;
 mText.erase(mCaretPosition, 1);
 if (mCaretPosition == sz || (mText[mCaretPosition] & 192) != 128)
 break;
 }
 mTextChanged = true;
}

void TextField::handlePaste()
{
 std::string text = getText();
 size_t caretPos = CAST_SIZE(getCaretPosition());

 if (retrieveBuffer(text, caretPos))
 {
 setText(text);
 setCaretPosition(CAST_U32(caretPos));
 }
}

void TextField::caretDeleteToStart()
{
 if (mCaretPosition > 0)
 {
 mText = mText.substr(mCaretPosition);
 mCaretPosition = 0;
 }
 mTextChanged = true;
}

void TextField::moveCaretWordBack()
{
 const unsigned int oldCaret = mCaretPosition;
 while (mCaretPosition > 0)
 {
 if (!isWordSeparator(mText[mCaretPosition - 1]))
 break;
 mCaretPosition --;
 }
 if (oldCaret != mCaretPosition)
 return;
 while (mCaretPosition > 0)
 {
 if (isWordSeparator(mText[mCaretPosition - 1]))
 break;
 mCaretPosition --;
 }
}

void TextField::moveCaretWordForward()
{
 const unsigned sz = CAST_U32(mText.size());
 const unsigned int oldCaret = mCaretPosition;
 while (mCaretPosition < sz)
 {
 if (!isWordSeparator(mText[mCaretPosition]))
 break;
 mCaretPosition ++;
 }
 if (oldCaret != mCaretPosition)
 return;
 while (mCaretPosition < sz)
 {
 if (isWordSeparator(mText[mCaretPosition]))
 break;
 mCaretPosition ++;
 }
}

void TextField::caretDeleteWord()
{
 while (mCaretPosition > 0)
 {
 deleteCharLeft(mText, &mCaretPosition);
 if (mCaretPosition > 0 && isWordSeparator(mText[mCaretPosition - 1]))
 break;
 }
 mTextChanged = true;
}

void TextField::handleCopy() const
{
 std::string text = getText();
 sendBuffer(text);
}

void TextField::drawCaret(Graphics* graphics, int x)
{
 const ClipRect &clipArea = graphics->getTopClip();

 graphics->setColor(*mCaretColor);
 graphics->drawLine(x + mPadding, clipArea.height - mPadding,
 x + mPadding, mPadding);
}

void TextField::adjustSize()
{
 setWidth(getFont()->getWidth(mText) + 2 * mPadding + 1);
 adjustHeight();

 fixScroll();
}

void TextField::adjustHeight()
{
 setHeight(getFont()->getHeight() + 2 * mPadding);
}

void TextField::fixScroll()
{
 if (isFocused())
 {
 const int caretX = getFont()->getWidth(
 mText.substr(0, mCaretPosition));

 const int width = mDimension.width;
 const int pad = 2 * mPadding;
 if (caretX - mXScroll >= width - pad)
 {
 mXScroll = caretX - width + pad;
 }
 else if (caretX - mXScroll <= 0)
 {
 mXScroll = caretX - width / 2;

 if (mXScroll < 0)
 mXScroll = 0;
 }
 }
}

void TextField::setCaretPosition(unsigned int position)
{
 const unsigned int sz = CAST_U32(mText.size());
 if (position > sz)
 mCaretPosition = CAST_S32(sz);
 else
 mCaretPosition = position;

 fixScroll();
}

void TextField::fontChanged()
{
 fixScroll();
}

void TextField::mousePressed(MouseEvent &event)
{
#ifdef ANDROID
 if (!WindowManager::isKeyboardVisible())
 inputManager.executeAction(InputAction::SHOW_KEYBOARD);
#endif // ANDROID

 event.consume();
 if (event.getButton() == MouseButton::RIGHT)
 {
#ifndef DYECMD
 if (popupMenu != nullptr)
 popupMenu->showTextFieldPopup(this);
#endif // DYECMD
 }
 else if (event.getButton() == MouseButton::LEFT)
 {
 mCaretPosition = getFont()->getStringIndexAt(
 mText, event.getX() + mXScroll);
 fixScroll();
 }
}

void TextField::focusGained(const Event &event A_UNUSED)
{
#ifdef ANDROID
 if (!WindowManager::isKeyboardVisible())
 inputManager.executeAction(InputAction::SHOW_KEYBOARD);
#endif // ANDROID
}

void TextField::focusLost(const Event &event A_UNUSED)
{
}

void TextField::setText(const std::string& text)
{
 const unsigned int sz = CAST_U32(text.size());
 if (sz < mCaretPosition)
 mCaretPosition = sz;
 mText = text;
 mTextChanged = true;
}

void TextField::mouseDragged(MouseEvent& event)
{
 event.consume();
}

void TextField::widgetHidden(const Event &event A_UNUSED)
{
 mTextChanged = true;
 mTextChunk.deleteImage();
}

void TextField::setParent(Widget *widget)
{
 if (mWindow != nullptr)
 mWindow->addWidgetListener(this);
 Widget::setParent(widget);
}

void TextField::setWindow(Widget *const widget)
{
 if ((widget == nullptr) && (mWindow != nullptr))
 {
 mWindow->removeWidgetListener(this);
 mWindow = nullptr;
 }
 else
 {
 Widget2::setWindow(widget);
 }
}

void TextField::signalEvent()
{
 distributeActionEvent();
}