scrollarea.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/scrollarea.h"

#include "settings.h"

#include "gui/gui.h"
#include "gui/skin.h"

#include "utils/delete2.h"
#include "utils/stringutils.h"

#include "render/graphics.h"

#include "render/vertexes/imagecollection.h"

#include "resources/imagerect.h"

#include "resources/image/image.h"

#include "debug.h"

int ScrollArea::instances = 0;
float ScrollArea::mAlpha = 1.0;
bool ScrollArea::mShowButtons = true;
int ScrollArea::mMarkerSize = 0;
int ScrollArea::mScrollbarSize = 12;
ImageRect ScrollArea::background;
ImageRect ScrollArea::vMarker;
ImageRect ScrollArea::vMarkerHi;
ImageRect ScrollArea::vBackground;
ImageRect ScrollArea::hBackground;
Image *ScrollArea::buttons[4][2];

static std::string const buttonFiles[2] =
{
 "scrollbuttons.xml",
 "scrollbuttons_pressed.xml"
};

ScrollArea::ScrollArea(Widget2 *const widget2,
 Widget *const widget,
 const Opaque opaque,
 const std::string &skin) :
 BasicContainer(widget2),
 MouseListener(),
 WidgetListener(),
 mVertexes(new ImageCollection),
 mVertexes2(new ImageCollection),
 mHPolicy(SHOW_AUTO),
 mVPolicy(SHOW_AUTO),
 mVScroll(0),
 mHScroll(0),
 mScrollbarWidth(12),
 mUpButtonScrollAmount(10),
 mDownButtonScrollAmount(10),
 mLeftButtonScrollAmount(10),
 mRightButtonScrollAmount(10),
 mHorizontalMarkerDragOffset(0),
 mVerticalMarkerDragOffset(0),
 mX(0),
 mY(0),
 mClickX(0),
 mClickY(0),
 mXOffset(0),
 mYOffset(0),
 mDrawWidth(0),
 mDrawHeight(0),
 mVBarVisible(false),
 mHBarVisible(false),
 mUpButtonPressed(false),
 mDownButtonPressed(false),
 mLeftButtonPressed(false),
 mRightButtonPressed(false),
 mIsVerticalMarkerDragged(false),
 mIsHorizontalMarkerDragged(false),
 mOpaque(Opaque_true),
 mHasMouse(false)
{
 setContent(widget);
 addMouseListener(this);
 mOpaque = opaque;
 init(skin);
}

ScrollArea::~ScrollArea()
{
 if (gui != nullptr)
 gui->removeDragged(this);

 // Garbage collection
 delete getContent();

 instances--;
 if (instances == 0)
 {
 Theme::unloadRect(background, 0, 8);
 Theme::unloadRect(vMarker, 0, 8);
 Theme::unloadRect(vMarkerHi, 0, 8);
 Theme::unloadRect(vBackground, 0, 8);
 Theme::unloadRect(hBackground, 0, 8);
 for (int i = 0; i < 2; i ++)
 {
 for (int f = UP; f < BUTTONS_DIR; f ++)
 {
 if (buttons[f][i] != nullptr)
 buttons[f][i]->decRef();
 }
 }
 }

 delete2(mVertexes);
 delete2(mVertexes2);

 setContent(nullptr);
}

void ScrollArea::init(std::string skinName)
{
 setOpaque(mOpaque);

 setUpButtonScrollAmount(2);
 setDownButtonScrollAmount(2);
 setLeftButtonScrollAmount(2);
 setRightButtonScrollAmount(2);

 if (instances == 0)
 {
 for (int f = 0; f < 9; f ++)
 {
 background.grid[f] = nullptr;
 vMarker.grid[f] = nullptr;
 vMarkerHi.grid[f] = nullptr;
 vBackground.grid[f] = nullptr;
 hBackground.grid[f] = nullptr;
 }

 // +++ here probably need move background from static
 if (skinName.empty())
 skinName = "scroll_background.xml";
 if (theme != nullptr)
 {
 theme->loadRect(background,
 skinName,
 "scroll_background.xml",
 0,
 8);
 theme->loadRect(vMarker,
 "scroll.xml",
 "",
 0,
 8);
 theme->loadRect(vMarkerHi,
 "scroll_highlighted.xml",
 "scroll.xml",
 0,
 8);
 theme->loadRect(vBackground,
 "scroll_vbackground.xml",
 "",
 0,
 8);
 theme->loadRect(hBackground,
 "scroll_hbackground.xml",
 "",
 0,
 8);
 }

 for (int i = 0; i < 2; i ++)
 {
 Skin *skin = nullptr;
 if (theme != nullptr)
 {
 skin = theme->load(buttonFiles[i],
 "scrollbuttons.xml",
  true,
 Theme::getThemePath());
 }
 if (skin != nullptr)
 {
 const ImageRect &rect = skin->getBorder();
 for (int f = UP; f < BUTTONS_DIR; f ++)
 {
 if (rect.grid[f] != nullptr)
 rect.grid[f]->incRef();
 buttons[f][i] = rect.grid[f];
 }
 if (i == 0)
 {
 mShowButtons = (skin->getOption("showbuttons", 1) == 1);
 mMarkerSize = skin->getOption("markersize", 0);
 mScrollbarSize = skin->getOption("scrollbarsize", 12);
 }
 }
 else
 {
 for (int f = UP; f < BUTTONS_DIR; f ++)
 buttons[f][i] = nullptr;
 }
 if (theme != nullptr)
 theme->unload(skin);
 }
 }
 mScrollbarWidth = mScrollbarSize;
 instances++;
}

void ScrollArea::logic()
{
 BLOCK_START("ScrollArea::logic")
 if (!isVisible())
 {
 BLOCK_END("ScrollArea::logic")
 return;
 }

 checkPolicies();

 setVerticalScrollAmount(mVScroll);
 setHorizontalScrollAmount(mHScroll);

 Widget *const content = getContent();
 if (content != nullptr)
 {
 unsigned int frameSize = content->getFrameSize();
 content->setPosition(-mHScroll + frameSize, -mVScroll + frameSize);
 content->logic();

 // When no scrollbar in a certain direction,
 // adapt content size to match the content dimension exactly.
 frameSize = 2 * content->getFrameSize();
 if (mHPolicy == ScrollArea::SHOW_NEVER)
 {
 content->setWidth((mVBarVisible ? (mDimension.width
 - mScrollbarWidth) : mDimension.width) - frameSize);
 }
 if (mVPolicy == ScrollArea::SHOW_NEVER)
 {
 content->setHeight((mHBarVisible ? (mDimension.height
 - mScrollbarWidth) : mDimension.height) - frameSize);
 }
 }

 if (mUpButtonPressed)
 setVerticalScrollAmount(mVScroll - mUpButtonScrollAmount);
 else if (mDownButtonPressed)
 setVerticalScrollAmount(mVScroll + mDownButtonScrollAmount);
 else if (mLeftButtonPressed)
 setHorizontalScrollAmount(mHScroll - mLeftButtonScrollAmount);
 else if (mRightButtonPressed)
 setHorizontalScrollAmount(mHScroll + mRightButtonScrollAmount);
 BLOCK_END("ScrollArea::logic")
}

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

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

void ScrollArea::draw(Graphics *const graphics)
{
 BLOCK_START("ScrollArea::draw")
 if (mVBarVisible || mHBarVisible)
 {
 if (mOpaque == Opaque_false)
 updateCalcFlag(graphics);
 // need add caching or remove calc calls.
// if (mRedraw)
 {
 mVertexes->clear();
 if (mVBarVisible)
 {
 if (mShowButtons)
 {
 calcButton(graphics, UP);
 calcButton(graphics, DOWN);
 }
 calcVBar(graphics);
 calcVMarker(graphics);
 }

 if (mHBarVisible)
 {
 if (mShowButtons)
 {
 calcButton(graphics, LEFT);
 calcButton(graphics, RIGHT);
 }
 calcHBar(graphics);
 calcHMarker(graphics);
 }
 graphics->finalize(mVertexes);
 }
 graphics->drawTileCollection(mVertexes);
 }

 updateAlpha();

 if (mRedraw)
 {
 const bool redraw = graphics->getRedraw();
 graphics->setRedraw(true);
 drawChildren(graphics);
 graphics->setRedraw(redraw);
 }
 else
 {
 drawChildren(graphics);
 }
 mRedraw = false;
 BLOCK_END("ScrollArea::draw")
}

void ScrollArea::safeDraw(Graphics *const graphics)
{
 BLOCK_START("ScrollArea::draw")
 if (mVBarVisible)
 {
 if (mShowButtons)
 {
 drawButton(graphics, UP);
 drawButton(graphics, DOWN);
 }
 drawVBar(graphics);
 drawVMarker(graphics);
 }

 if (mHBarVisible)
 {
 if (mShowButtons)
 {
 drawButton(graphics, LEFT);
 drawButton(graphics, RIGHT);
 }
 drawHBar(graphics);
 drawHMarker(graphics);
 }

 updateAlpha();

 safeDrawChildren(graphics);
 mRedraw = false;
 BLOCK_END("ScrollArea::draw")
}

void ScrollArea::updateCalcFlag(const Graphics *const graphics)
{
 if (!mRedraw)
 {
 // because we don't know where parent windows was moved,
 // need recalc vertexes
 const ClipRect &rect = graphics->getTopClip();
 if (rect.xOffset != mXOffset || rect.yOffset != mYOffset)
 {
 mRedraw = true;
 mXOffset = rect.xOffset;
 mYOffset = rect.yOffset;
 }
 else if (rect.width != mDrawWidth || rect.height != mDrawHeight)
 {
 mRedraw = true;
 mDrawWidth = rect.width;
 mDrawHeight = rect.height;
 }
 else if (graphics->getRedraw())
 {
 mRedraw = true;
 }
 }
}

void ScrollArea::drawFrame(Graphics *const graphics)
{
 BLOCK_START("ScrollArea::drawFrame")
 if (mOpaque == Opaque_true)
 {
 const int bs = mFrameSize * 2;
 const int w = mDimension.width + bs;
 const int h = mDimension.height + bs;

 updateCalcFlag(graphics);

 if (mRedraw)
 {
 mVertexes2->clear();
 graphics->calcWindow(mVertexes2,
 0, 0,
 w, h,
 background);
 graphics->finalize(mVertexes2);
 }
 graphics->drawTileCollection(mVertexes2);
 }
 BLOCK_END("ScrollArea::drawFrame")
}

void ScrollArea::safeDrawFrame(Graphics *const graphics)
{
 BLOCK_START("ScrollArea::drawFrame")
 if (mOpaque == Opaque_true)
 {
 const int bs = mFrameSize * 2;
 const int w = mDimension.width + bs;
 const int h = mDimension.height + bs;

 updateCalcFlag(graphics);
 graphics->drawImageRect(0, 0,
 w, h,
 background);
 }
 BLOCK_END("ScrollArea::drawFrame")
}

void ScrollArea::setOpaque(Opaque opaque)
{
 mOpaque = opaque;
 setFrameSize(mOpaque == Opaque_true ? 2 : 0);
}

Image *ScrollArea::getImageByState(Rect &dim, const BUTTON_DIR dir)
{
 int state = 0;

 switch (dir)
 {
 case UP:
 state = mUpButtonPressed ? 1 : 0;
 dim = getUpButtonDimension();
 break;
 case DOWN:
 state = mDownButtonPressed ? 1 : 0;
 dim = getDownButtonDimension();
 break;
 case LEFT:
 state = mLeftButtonPressed ? 1 : 0;
 dim = getLeftButtonDimension();
 break;
 case RIGHT:
 state = mRightButtonPressed ? 1 : 0;
 dim = getRightButtonDimension();
 break;
 case BUTTONS_DIR:
 default:
 logger->log("ScrollArea::drawButton unknown dir: "
 + toString(CAST_U32(dir)));
 return nullptr;
 }
 return buttons[CAST_SIZE(dir)][state];
}

void ScrollArea::drawButton(Graphics *const graphics,
 const BUTTON_DIR dir)
{
 Rect dim;
 const Image *const image = getImageByState(dim, dir);

 if (image != nullptr)
 graphics->drawImage(image, dim.x, dim.y);
}

void ScrollArea::calcButton(Graphics *const graphics,
 const BUTTON_DIR dir)
{
 Rect dim;
 const Image *const image = getImageByState(dim, dir);

 if (image != nullptr)
 {
 static_cast<Graphics*>(graphics)->calcTileCollection(
 mVertexes, image, dim.x, dim.y);
 }
}

void ScrollArea::drawVBar(Graphics *const graphics) const
{
 const Rect &dim = getVerticalBarDimension();

 if (vBackground.grid[4] != nullptr)
 {
 graphics->drawPattern(vBackground.grid[4],
 dim.x, dim.y, dim.width, dim.height);
 }
 if (vBackground.grid[1] != nullptr)
 {
 graphics->drawPattern(vBackground.grid[1],
 dim.x, dim.y,
 dim.width, vBackground.grid[1]->getHeight());
 }
 if (vBackground.grid[7] != nullptr)
 {
 graphics->drawPattern(vBackground.grid[7],
 dim.x, dim.height - vBackground.grid[7]->getHeight() + dim.y,
 dim.width, vBackground.grid[7]->getHeight());
 }
}

void ScrollArea::calcVBar(const Graphics *const graphics)
{
 const Rect &dim = getVerticalBarDimension();

 if (vBackground.grid[4] != nullptr)
 {
 graphics->calcPattern(mVertexes,
 vBackground.grid[4],
 dim.x, dim.y,
 dim.width, dim.height);
 }
 if (vBackground.grid[1] != nullptr)
 {
 graphics->calcPattern(mVertexes,
 vBackground.grid[1],
 dim.x, dim.y,
 dim.width, vBackground.grid[1]->getHeight());
 }
 if (vBackground.grid[7] != nullptr)
 {
 graphics->calcPattern(mVertexes,
 vBackground.grid[7],
 dim.x, dim.height - vBackground.grid[7]->getHeight() + dim.y,
 dim.width, vBackground.grid[7]->getHeight());
 }
}

void ScrollArea::drawHBar(Graphics *const graphics) const
{
 const Rect &dim = getHorizontalBarDimension();

 if (hBackground.grid[4] != nullptr)
 {
 graphics->drawPattern(hBackground.grid[4],
 dim.x, dim.y,
 dim.width, dim.height);
 }

 if (hBackground.grid[3] != nullptr)
 {
 graphics->drawPattern(hBackground.grid[3],
 dim.x, dim.y,
 hBackground.grid[3]->getWidth(), dim.height);
 }

 if (hBackground.grid[5] != nullptr)
 {
 graphics->drawPattern(hBackground.grid[5],
 dim.x + dim.width - hBackground.grid[5]->getWidth(),
 dim.y,
 hBackground.grid[5]->getWidth(),
 dim.height);
 }
}

void ScrollArea::calcHBar(const Graphics *const graphics)
{
 const Rect &dim = getHorizontalBarDimension();

 if (hBackground.grid[4] != nullptr)
 {
 graphics->calcPattern(mVertexes,
 hBackground.grid[4],
 dim.x, dim.y,
 dim.width, dim.height);
 }

 if (hBackground.grid[3] != nullptr)
 {
 graphics->calcPattern(mVertexes,
 hBackground.grid[3],
 dim.x, dim.y,
 hBackground.grid[3]->getWidth(), dim.height);
 }

 if (hBackground.grid[5] != nullptr)
 {
 graphics->calcPattern(mVertexes,
 hBackground.grid[5],
 dim.x + dim.width - hBackground.grid[5]->getWidth(),
 dim.y,
 hBackground.grid[5]->getWidth(),
 dim.height);
 }
}

void ScrollArea::drawVMarker(Graphics *const graphics)
{
 const Rect &dim = getVerticalMarkerDimension();

 if ((mHasMouse) && (mX > (mDimension.width - mScrollbarWidth)))
 {
 graphics->drawImageRect(dim.x, dim.y,
 dim.width, dim.height,
 vMarkerHi);
 }
 else
 {
 graphics->drawImageRect(dim.x, dim.y,
 dim.width, dim.height,
 vMarker);
 }
}

void ScrollArea::calcVMarker(Graphics *const graphics)
{
 const Rect &dim = getVerticalMarkerDimension();

 if ((mHasMouse) && (mX > (mDimension.width - mScrollbarWidth)))
 {
 graphics->calcWindow(mVertexes,
 dim.x, dim.y,
 dim.width, dim.height,
 vMarkerHi);
 }
 else
 {
 graphics->calcWindow(mVertexes,
 dim.x, dim.y,
 dim.width, dim.height,
 vMarker);
 }
}

void ScrollArea::drawHMarker(Graphics *const graphics)
{
 const Rect dim = getHorizontalMarkerDimension();

 if ((mHasMouse) && (mY > (mDimension.height - mScrollbarWidth)))
 {
 graphics->drawImageRect(dim.x, dim.y,
 dim.width, dim.height,
 vMarkerHi);
 }
 else
 {
 graphics->drawImageRect(
 dim.x, dim.y,
 dim.width, dim.height,
 vMarker);
 }
}

void ScrollArea::calcHMarker(Graphics *const graphics)
{
 const Rect dim = getHorizontalMarkerDimension();

 if ((mHasMouse) && (mY > (mDimension.height - mScrollbarWidth)))
 {
 graphics->calcWindow(mVertexes,
 dim.x, dim.y,
 dim.width, dim.height,
 vMarkerHi);
 }
 else
 {
 graphics->calcWindow(mVertexes,
 dim.x, dim.y,
 dim.width, dim.height,
 vMarker);
 }
}

void ScrollArea::mouseMoved(MouseEvent& event)
{
 mX = event.getX();
 mY = event.getY();
}

void ScrollArea::mouseEntered(MouseEvent& event A_UNUSED)
{
 mHasMouse = true;
}

void ScrollArea::mouseExited(MouseEvent& event A_UNUSED)
{
 mHasMouse = false;
}

void ScrollArea::widgetResized(const Event &event A_UNUSED)
{
 mRedraw = true;
 const unsigned int frameSize = 2 * mFrameSize;
 Widget *const content = getContent();
 if (content != nullptr)
 {
 content->setSize(mDimension.width - frameSize,
 mDimension.height - frameSize);
 }
}

void ScrollArea::widgetMoved(const Event& event A_UNUSED)
{
 mRedraw = true;
}

void ScrollArea::mousePressed(MouseEvent& event)
{
 const int x = event.getX();
 const int y = event.getY();

 if (getUpButtonDimension().isPointInRect(x, y))
 {
 setVerticalScrollAmount(mVScroll
 - mUpButtonScrollAmount);
 mUpButtonPressed = true;
 event.consume();
 }
 else if (getDownButtonDimension().isPointInRect(x, y))
 {
 setVerticalScrollAmount(mVScroll
 + mDownButtonScrollAmount);
 mDownButtonPressed = true;
 event.consume();
 }
 else if (getLeftButtonDimension().isPointInRect(x, y))
 {
 setHorizontalScrollAmount(mHScroll
 - mLeftButtonScrollAmount);
 mLeftButtonPressed = true;
 event.consume();
 }
 else if (getRightButtonDimension().isPointInRect(x, y))
 {
 setHorizontalScrollAmount(mHScroll
 + mRightButtonScrollAmount);
 mRightButtonPressed = true;
 event.consume();
 }
 else if (getVerticalMarkerDimension().isPointInRect(x, y))
 {
 mIsHorizontalMarkerDragged = false;
 mIsVerticalMarkerDragged = true;

 mVerticalMarkerDragOffset = y - getVerticalMarkerDimension().y;
 event.consume();
 }
 else if (getVerticalBarDimension().isPointInRect(x, y))
 {
 if (y < getVerticalMarkerDimension().y)
 {
 setVerticalScrollAmount(mVScroll
 - CAST_S32(getChildrenArea().height * 0.1));
 }
 else
 {
 setVerticalScrollAmount(mVScroll
 + CAST_S32(getChildrenArea().height * 0.1));
 }
 event.consume();
 }
 else if (getHorizontalMarkerDimension().isPointInRect(x, y))
 {
 mIsHorizontalMarkerDragged = true;
 mIsVerticalMarkerDragged = false;
 mHorizontalMarkerDragOffset = x - getHorizontalMarkerDimension().x;
 event.consume();
 }
 else if (getHorizontalBarDimension().isPointInRect(x, y))
 {
 if (x < getHorizontalMarkerDimension().x)
 {
 setHorizontalScrollAmount(mHScroll
 - CAST_S32(getChildrenArea().width * 0.1));
 }
 else
 {
 setHorizontalScrollAmount(mHScroll
 + CAST_S32(getChildrenArea().width * 0.1));
 }
 event.consume();
 }

 if (event.getButton() == MouseButton::LEFT &&
 !event.isConsumed())
 {
 mClickX = event.getX();
 mClickY = event.getY();
 }
}

void ScrollArea::mouseReleased(MouseEvent& event)
{
 if (event.getButton() == MouseButton::LEFT &&
 mClickX != 0 &&
 mClickY != 0)
 {
 if (!event.isConsumed())
 {
#ifdef ANDROID
 int dx = mClickX - event.getX();
 int dy = mClickY - event.getY();
#else // ANDROID

 int dx = event.getX() - mClickX;
 int dy = event.getY() - mClickY;
#endif // ANDROID

 if ((dx < 20 && dx > 0) || (dx > -20 && dx < 0))
 dx = 0;

 if ((dy < 20 && dy > 0) || (dy > -20 && dy < 0))
 dy = 0;

 if (abs(dx) > abs(dy))
 {
 int s = mHScroll + dx;
 if (s < 0)
 {
 s = 0;
 }
 else
 {
 const int maxH = getHorizontalMaxScroll();
 if (s > maxH)
 s = maxH;
 }

 setHorizontalScrollAmount(s);
 }
 else if (dy != 0)
 {
 int s = mVScroll + dy;
 if (s < 0)
 {
 s = 0;
 }
 else
 {
 const int maxV = getVerticalMaxScroll();
 if (s > maxV)
 s = maxV;
 }

 setVerticalScrollAmount(s);
 }
 mClickX = 0;
 mClickY = 0;
 if (mMouseConsume && ((dx != 0) || (dy != 0)))
 event.consume();
 }
 }
 mUpButtonPressed = false;
 mDownButtonPressed = false;
 mLeftButtonPressed = false;
 mRightButtonPressed = false;
 mIsHorizontalMarkerDragged = false;
 mIsVerticalMarkerDragged = false;
 if (mMouseConsume)
 event.consume();
 mRedraw = true;
}

void ScrollArea::mouseDragged(MouseEvent &event)
{
 if (mIsVerticalMarkerDragged)
 {
 const Rect barDim = getVerticalBarDimension();

 const int pos = event.getY() - barDim.y
 - mVerticalMarkerDragOffset;
 const int length = getVerticalMarkerDimension().height;

 if ((barDim.height - length) > 0)
 {
 setVerticalScrollAmount((getVerticalMaxScroll() * pos)
 / (barDim.height - length));
 }
 else
 {
 setVerticalScrollAmount(0);
 }
 }

 if (mIsHorizontalMarkerDragged)
 {
 const Rect barDim = getHorizontalBarDimension();

 const int pos = event.getX() - barDim.x
 - mHorizontalMarkerDragOffset;
 const int length = getHorizontalMarkerDimension().width;

 if ((barDim.width - length) > 0)
 {
 setHorizontalScrollAmount((getHorizontalMaxScroll() * pos)
 / (barDim.width - length));
 }
 else
 {
 setHorizontalScrollAmount(0);
 }
 }

 event.consume();
 mRedraw = true;
}

Rect ScrollArea::getVerticalBarDimension() const
{
 if (!mVBarVisible)
 return Rect(0, 0, 0, 0);

 const int height = mShowButtons ? mScrollbarWidth : 0;
 if (mHBarVisible)
 {
 return Rect(mDimension.width - mScrollbarWidth,
 height,
 mScrollbarWidth,
 mDimension.height - 2 * height - mScrollbarWidth);
 }

 return Rect(mDimension.width - mScrollbarWidth,
 height,
 mScrollbarWidth,
 mDimension.height - 2 * height);
}

Rect ScrollArea::getHorizontalBarDimension() const
{
 if (!mHBarVisible)
 return Rect(0, 0, 0, 0);

 const int width = mShowButtons ? mScrollbarWidth : 0;
 if (mVBarVisible)
 {
 return Rect(width,
 mDimension.height - mScrollbarWidth,
 mDimension.width - 2 * width - mScrollbarWidth,
 mScrollbarWidth);
 }

 return Rect(width,
 mDimension.height - mScrollbarWidth,
 mDimension.width - 2 * width,
 mScrollbarWidth);
}

Rect ScrollArea::getVerticalMarkerDimension()
{
 if (!mVBarVisible)
 return Rect(0, 0, 0, 0);

 int length, pos;
 int height;
 const int h2 = mShowButtons
 ? mScrollbarWidth : mMarkerSize / 2;
 const Widget *content;
 if (!mWidgets.empty())
 content = *mWidgets.begin();
 else
 content = nullptr;

 if (mHBarVisible)
 height = mDimension.height - 2 * h2 - mScrollbarWidth;
 else
 height = mDimension.height - 2 * h2;

 const int maxV = getVerticalMaxScroll();
 if ((mMarkerSize != 0) && (maxV != 0))
 {
 pos = (mVScroll * height / maxV - mMarkerSize / 2);
 length = mMarkerSize;
 }
 else
 {
 if (content != nullptr)
 {
 const int h3 = content->getHeight();
 if (h3 != 0)
 length = (height * getChildrenArea().height) / h3;
 else
 length = height;
 }
 else
 {
 length = height;
 }

 if (length < mScrollbarWidth)
 length = mScrollbarWidth;

 if (length > height)
 length = height;

 if (maxV != 0)
 pos = ((height - length) * mVScroll) / maxV;
 else
 pos = 0;
 }

 return Rect(mDimension.width - mScrollbarWidth, h2 + pos,
 mScrollbarWidth, length);
}

Rect ScrollArea::getHorizontalMarkerDimension()
{
 if (!mHBarVisible)
 return Rect(0, 0, 0, 0);

 int length, pos;
 int width;
 const int w2 = mShowButtons
 ? mScrollbarWidth : mMarkerSize / 2;
 const Widget *content;
 if (!mWidgets.empty())
 content = *mWidgets.begin();
 else
 content = nullptr;

 if (mVBarVisible)
 width = mDimension.width - 2 * w2 - mScrollbarWidth;
 else
 width = mDimension.width - w2 - mScrollbarWidth;

 const int maxH = getHorizontalMaxScroll();
 if (mMarkerSize != 0 && maxH != 0)
 {
 pos = (mHScroll * width / maxH - mMarkerSize / 2);
 length = mMarkerSize;
 }
 else
 {
 if (content != nullptr)
 {
 const int w3 = content->getWidth();
 if (w3 != 0)
 length = (width * getChildrenArea().width) / w3;
 else
 length = width;
 }
 else
 {
 length = width;
 }

 if (length < mScrollbarWidth)
 length = mScrollbarWidth;

 if (length > width)
 length = width;

 if (maxH != 0)
 {
 pos = ((width - length) * mHScroll) / maxH;
 }
 else
 {
 pos = 0;
 }
 }

 return Rect(w2 + pos, mDimension.height - mScrollbarWidth,
 length, mScrollbarWidth);
}

Rect ScrollArea::getUpButtonDimension() const
{
 if (!mVBarVisible || !mShowButtons)
 return Rect(0, 0, 0, 0);

 return Rect(mDimension.width - mScrollbarWidth, 0,
 mScrollbarWidth, mScrollbarWidth);
}

Rect ScrollArea::getDownButtonDimension() const
{
 if (!mVBarVisible || !mShowButtons)
  return Rect(0, 0, 0, 0);

 if (mHBarVisible)
 {
 return Rect(mDimension.width - mScrollbarWidth,
 mDimension.height - mScrollbarWidth * 2,
 mScrollbarWidth,
 mScrollbarWidth);
 }

 return Rect(mDimension.width - mScrollbarWidth,
 mDimension.height - mScrollbarWidth,
 mScrollbarWidth,
 mScrollbarWidth);
}

Rect ScrollArea::getLeftButtonDimension() const
{
 if (!mHBarVisible || !mShowButtons)
 return Rect(0, 0, 0, 0);

 return Rect(0, mDimension.height - mScrollbarWidth,
 mScrollbarWidth, mScrollbarWidth);
}

Rect ScrollArea::getRightButtonDimension() const
{
 if (!mHBarVisible || !mShowButtons)
 return Rect(0, 0, 0, 0);

 if (mVBarVisible)
 {
 return Rect(mDimension.width - mScrollbarWidth*2,
 mDimension.height - mScrollbarWidth,
 mScrollbarWidth,
 mScrollbarWidth);
 }

 return Rect(mDimension.width - mScrollbarWidth,
 mDimension.height - mScrollbarWidth,
 mScrollbarWidth,
 mScrollbarWidth);
}

void ScrollArea::setContent(Widget* widget)
{
 if (widget != nullptr)
 {
 clear();
 add(widget);
 widget->setPosition(0, 0);
 }
 else
 {
 clear();
 }

 checkPolicies();
}

Widget* ScrollArea::getContent()
{
 if (!mWidgets.empty())
 return *mWidgets.begin();

 return nullptr;
}

void ScrollArea::setHorizontalScrollPolicy(const ScrollPolicy hPolicy)
{
 mHPolicy = hPolicy;
 checkPolicies();
}

void ScrollArea::setVerticalScrollPolicy(const ScrollPolicy vPolicy)
{
 mVPolicy = vPolicy;
 checkPolicies();
}

void ScrollArea::setScrollPolicy(const ScrollPolicy hPolicy,
 const ScrollPolicy vPolicy)
{
 mHPolicy = hPolicy;
 mVPolicy = vPolicy;
 checkPolicies();
}

void ScrollArea::setVerticalScrollAmount(const int vScroll)
{
 const int max = getVerticalMaxScroll();

 mVScroll = vScroll;

 if (vScroll > max)
 mVScroll = max;

 if (vScroll < 0)
 mVScroll = 0;
}

void ScrollArea::setHorizontalScrollAmount(int hScroll)
{
 const int max = getHorizontalMaxScroll();

 mHScroll = hScroll;

 if (hScroll > max)
 mHScroll = max;
 else if (hScroll < 0)
 mHScroll = 0;
}

void ScrollArea::setScrollAmount(const int hScroll, const int vScroll)
{
 setHorizontalScrollAmount(hScroll);
 setVerticalScrollAmount(vScroll);
}

int ScrollArea::getHorizontalMaxScroll()
{
 checkPolicies();

 const Widget *const content = getContent();
 if (content == nullptr)
 return 0;

 const int value = content->getWidth() - getChildrenArea().width +
 2 * content->getFrameSize();

 if (value < 0)
 return 0;

 return value;
}

int ScrollArea::getVerticalMaxScroll()
{
 checkPolicies();

 const Widget *const content = getContent();
 if (content == nullptr)
 return 0;

 int value;

 value = content->getHeight() - getChildrenArea().height +
 2 * content->getFrameSize();

 if (value < 0)
 return 0;

 return value;
}

void ScrollArea::setScrollbarWidth(const int width)
{
 if (width > 0)
 mScrollbarWidth = width;
}

void ScrollArea::showWidgetPart(Widget *const widget, const Rect &area)
{
 const Widget *const content = getContent();
 if (widget != content || (content == nullptr))
 return;

 BasicContainer::showWidgetPart(widget, area);

 setHorizontalScrollAmount(content->getFrameSize()
 - content->getX());
 setVerticalScrollAmount(content->getFrameSize()
 - content->getY());
}

Rect ScrollArea::getChildrenArea()
{
 const Rect area = Rect(0, 0,
 mVBarVisible ? (getWidth() - mScrollbarWidth) : getWidth(),
 mHBarVisible ? (getHeight() - mScrollbarWidth) : getHeight());

 if (area.width < 0 || area.height < 0)
 return Rect();

 return area;
}

Widget *ScrollArea::getWidgetAt(int x, int y)
{
 if (getChildrenArea().isPointInRect(x, y))
 return getContent();

 return nullptr;
}

void ScrollArea::setWidth(int width)
{
 Widget::setWidth(width);
 checkPolicies();
}

void ScrollArea::setHeight(int height)
{
 Widget::setHeight(height);
 checkPolicies();
}

void ScrollArea::setDimension(const Rect& dimension)
{
 Widget::setDimension(dimension);
 checkPolicies();
}

void ScrollArea::mouseWheelMovedUp(MouseEvent& event)
{
 if (event.isConsumed())
 return;

 setVerticalScrollAmount(mVScroll
 - getChildrenArea().height / 8);

 event.consume();
}

void ScrollArea::mouseWheelMovedDown(MouseEvent& event)
{
 if (event.isConsumed())
 return;

 setVerticalScrollAmount(mVScroll
 + getChildrenArea().height / 8);

 event.consume();
}

void ScrollArea::checkPolicies()
{
 const int w = getWidth();
 const int h = getHeight();

 mHBarVisible = false;
 mVBarVisible = false;

 const Widget *const content = getContent();
 if (content == nullptr)
 {
 mHBarVisible = (mHPolicy == SHOW_ALWAYS);
 mVBarVisible = (mVPolicy == SHOW_ALWAYS);
 return;
 }

 if (mHPolicy == SHOW_AUTO &&
 mVPolicy == SHOW_AUTO)
 {
 if (content->getWidth() <= w
 && content->getHeight() <= h)
 {
 mHBarVisible = false;
 mVBarVisible = false;
 }

 if (content->getWidth() > w)
 {
 mHBarVisible = true;
 }

 if ((content->getHeight() > h)
 || (mHBarVisible && content->getHeight()
 > h - mScrollbarWidth))
 {
 mVBarVisible = true;
 }

 if (mVBarVisible && content->getWidth() > w - mScrollbarWidth)
 mHBarVisible = true;

 return;
 }

 switch (mHPolicy)
 {
 case SHOW_NEVER:
 mHBarVisible = false;
 break;

 case SHOW_ALWAYS:
 mHBarVisible = true;
 break;

 case SHOW_AUTO:
 if (mVPolicy == SHOW_NEVER)
 {
 mHBarVisible = (content->getWidth() > w);
 }
 else // (mVPolicy == SHOW_ALWAYS)
 {
 mHBarVisible = (content->getWidth()
 > w - mScrollbarWidth);
 }
 break;

 default:
 break;
 }

 switch (mVPolicy)
 {
 case SHOW_NEVER:
 mVBarVisible = false;
 break;

 case SHOW_ALWAYS:
 mVBarVisible = true;
 break;

 case SHOW_AUTO:
 if (mHPolicy == SHOW_NEVER)
 {
 mVBarVisible = (content->getHeight() > h);
 }
 else // (mHPolicy == SHOW_ALWAYS)
 {
 mVBarVisible = (content->getHeight()
 > h - mScrollbarWidth);
 }
 break;
 default:
 break;
 }
}

bool ScrollArea::isSelectable() const noexcept2
{
 if (mVBarVisible || mHBarVisible)
 return true;
 return Widget::isSelectable();
}