slider.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,
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 * 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/>.
 */

/* _______ __ __ __ ______ __ __ _______ __ __
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 *
 * 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
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 * License: (BSD)
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 * 3. Neither the name of Guichan nor the names of its contributors may
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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 */

#include "gui/widgets/slider.h"

#include "settings.h"

#include "enums/gui/slidergrid.h"

#include "gui/gui.h"

#include "utils/delete2.h"

#include "resources/imagerect.h"

#include "resources/image/image.h"

#include "render/graphics.h"

#include "render/vertexes/imagecollection.h"

#include "debug.h"

ImageRect Slider::buttons[2];
float Slider::mAlpha = 1.0;
int Slider::mInstances = 0;

static std::string const data[2] =
{
 "slider.xml",
 "slider_highlighted.xml"
};

Slider::Slider(Widget2 *const widget,
 const double scaleEnd,
 const double stepLength) :
 Widget(widget),
 MouseListener(),
 KeyListener(),
 mValue(0),
 mStepLength(stepLength),
 mScaleStart(0),
 mScaleEnd(scaleEnd),
 mOrientation(Orientation::HORIZONTAL),
 mVertexes(new ImageCollection),
 mMarkerLength(10),
 mHasMouse(false)
{
 init();
}

Slider::Slider(Widget2 *const widget,
 const double scaleStart,
 const double scaleEnd,
 const double stepLength) :
 Widget(widget),
 MouseListener(),
 KeyListener(),
 mValue(scaleStart),
 mStepLength(stepLength),
 mScaleStart(scaleStart),
 mScaleEnd(scaleEnd),
 mOrientation(Orientation::HORIZONTAL),
 mVertexes(new ImageCollection),
 mMarkerLength(10),
 mHasMouse(false)
{
 init();
}

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

 delete2(mVertexes);
 mInstances--;
 if (mInstances == 0)
 {
 for (int mode = 0; mode < 2; mode ++)
 Theme::unloadRect(buttons[mode], 0, 8);
 }
}

void Slider::init()
{
 mAllowLogic = false;
 setFocusable(true);
 setFrameSize(1);

 addMouseListener(this);
 addKeyListener(this);

 setFrameSize(0);

 // Load resources
 if (mInstances == 0)
 {
 if (theme != nullptr)
 {
 for (int mode = 0; mode < 2; mode ++)
 theme->loadRect(buttons[mode], data[mode], "slider.xml", 0, 8);
 }
 updateAlpha();
 }

 mInstances++;

 if (buttons[0].grid[SliderGrid::HGRIP] != nullptr)
 setMarkerLength(buttons[0].grid[SliderGrid::HGRIP]->getWidth());
}

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

 if (alpha != mAlpha)
 {
 mAlpha = alpha;
 for (int f = 0; f < 2; f ++)
 {
 for (int d = 0; d < SliderGrid::SLIDER_MAX; d ++)
 {
 if (buttons[f].grid[d] != nullptr)
 buttons[f].grid[d]->setAlpha(mAlpha);
 }
 }
 }
}

void Slider::draw(Graphics *const graphics)
{
 BLOCK_START("Slider::draw")
 if ((buttons[0].grid[SliderGrid::HSTART] == nullptr) ||
 (buttons[1].grid[SliderGrid::HSTART] == nullptr) ||
 (buttons[0].grid[SliderGrid::HEND] == nullptr))
 {
 BLOCK_END("Slider::draw")
 return;
 }

 int w = getWidth();
 const int h = getHeight();
 const int y = mHasMouse ?
 (h - buttons[1].grid[SliderGrid::HSTART]->getHeight()) / 2 :
 (h - buttons[0].grid[SliderGrid::HSTART]->getHeight()) / 2;

 updateAlpha();

 if (mRedraw || graphics->getRedraw())
 {
 int x = 0;
 mRedraw = false;
 mVertexes->clear();
 if (!mHasMouse)
 {
 graphics->calcTileCollection(mVertexes,
 buttons[0].grid[SliderGrid::HSTART],
 x, y);

 const int width = buttons[0].grid[SliderGrid::HSTART]->getWidth();
 w -= width + buttons[0].grid[SliderGrid::HEND]->getWidth();
 x += width;

 if (buttons[0].grid[SliderGrid::HMID] != nullptr)
 {
 const Image *const hMid = buttons[0].grid[SliderGrid::HMID];
 graphics->calcPattern(mVertexes,
 hMid,
 x, y,
 w, hMid->getHeight());
 }

 x += w;
 graphics->calcTileCollection(mVertexes,
 buttons[0].grid[SliderGrid::HEND],
 x, y);

 const Image *const img = buttons[0].grid[SliderGrid::HGRIP];
 if (img != nullptr)
 {
 graphics->calcTileCollection(mVertexes,
 img,
 getMarkerPosition(),
 (mDimension.height - img->getHeight()) / 2);
 }
 }
 else
 {
 graphics->calcTileCollection(mVertexes,
 buttons[1].grid[SliderGrid::HSTART],
 x, y);

 const int width = buttons[1].grid[SliderGrid::HSTART]->getWidth();
 w -= width;
 if (buttons[1].grid[SliderGrid::HEND] != nullptr)
 w -= buttons[1].grid[SliderGrid::HEND]->getWidth();
 x += width;

 if (buttons[1].grid[SliderGrid::HMID] != nullptr)
 {
 const Image *const hMid = buttons[1].grid[SliderGrid::HMID];
 graphics->calcPattern(mVertexes,
 hMid,
 x, y,
 w, hMid->getHeight());
 }

 x += w;
 if (buttons[1].grid[SliderGrid::HEND] != nullptr)
 {
 graphics->calcTileCollection(mVertexes,
 buttons[1].grid[SliderGrid::HEND], x, y);
 }

 const Image *const img = buttons[1].grid[SliderGrid::HGRIP];
 if (img != nullptr)
 {
 graphics->calcTileCollection(mVertexes,
 img,
 getMarkerPosition(),
 (mDimension.height - img->getHeight()) / 2);
 }
 }
 graphics->finalize(mVertexes);
 }
 graphics->drawTileCollection(mVertexes);

 BLOCK_END("Slider::draw")
}

void Slider::safeDraw(Graphics *const graphics)
{
 BLOCK_START("Slider::draw")
 if ((buttons[0].grid[SliderGrid::HSTART] == nullptr) ||
 (buttons[1].grid[SliderGrid::HSTART] == nullptr) ||
 (buttons[0].grid[SliderGrid::HEND] == nullptr))
 {
 BLOCK_END("Slider::draw")
 return;
 }

 int w = getWidth();
 const int h = getHeight();
 int x = 0;
 const int y = mHasMouse ?
 (h - buttons[1].grid[SliderGrid::HSTART]->getHeight()) / 2 :
 (h - buttons[0].grid[SliderGrid::HSTART]->getHeight()) / 2;

 updateAlpha();

 if (!mHasMouse)
 {
 graphics->drawImage(buttons[0].grid[SliderGrid::HSTART], x, y);
 const int width = buttons[0].grid[SliderGrid::HSTART]->getWidth();
 w -= width + buttons[0].grid[SliderGrid::HEND]->getWidth();
 x += width;

  if (buttons[0].grid[SliderGrid::HMID] != nullptr)
 {
 const Image *const hMid = buttons[0].grid[SliderGrid::HMID];
 graphics->drawPattern(hMid, x, y, w, hMid->getHeight());
 }

 x += w;
 graphics->drawImage(buttons[0].grid[SliderGrid::HEND], x, y);

 const Image *const img = buttons[0].grid[SliderGrid::HGRIP];
 if (img != nullptr)
 {
 graphics->drawImage(img, getMarkerPosition(),
 (mDimension.height - img->getHeight()) / 2);
 }
 }
 else
 {
 graphics->drawImage(buttons[1].grid[SliderGrid::HSTART], x, y);

 const int width = buttons[1].grid[SliderGrid::HSTART]->getWidth();
 w -= width;
 if (buttons[1].grid[SliderGrid::HEND] != nullptr)
 w -= buttons[1].grid[SliderGrid::HEND]->getWidth();
 x += width;

 if (buttons[1].grid[SliderGrid::HMID] != nullptr)
 {
 const Image *const hMid = buttons[1].grid[SliderGrid::HMID];
 graphics->drawPattern(hMid, x, y, w, hMid->getHeight());
 }

 x += w;
 if (buttons[1].grid[SliderGrid::HEND] != nullptr)
 graphics->drawImage(buttons[1].grid[SliderGrid::HEND], x, y);

 const Image *const img = buttons[1].grid[SliderGrid::HGRIP];
 if (img != nullptr)
 {
 graphics->drawImage(img, getMarkerPosition(),
 (mDimension.height - img->getHeight()) / 2);
 }
 }

 BLOCK_END("Slider::draw")
}

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

void Slider::mouseExited(MouseEvent& event A_UNUSED)
{
 mHasMouse = false;
 mRedraw = true;
}

void Slider::mousePressed(MouseEvent &event)
{
 const int x = event.getX();
 const int y = event.getY();
 const int width = mDimension.width;
 const int height = mDimension.height;

 if (event.getButton() == MouseButton::LEFT
 && x >= 0 && x <= width && y >= 0 && y <= height)
 {
 event.consume();
 if (mOrientation == Orientation::HORIZONTAL)
 setValue(markerPositionToValue(x - mMarkerLength / 2));
 else
 setValue(markerPositionToValue(height - y - mMarkerLength / 2));
 distributeActionEvent();
 }
}

void Slider::mouseDragged(MouseEvent &event)
{
 if (mOrientation == Orientation::HORIZONTAL)
 {
 setValue(markerPositionToValue(event.getX() - mMarkerLength / 2));
 }
 else
 {
 setValue(markerPositionToValue(
 mDimension.height - event.getY() - mMarkerLength / 2));
 }

 distributeActionEvent();

 event.consume();
}

void Slider::mouseWheelMovedUp(MouseEvent &event)
{
 setValue(mValue + mStepLength);
 distributeActionEvent();
 event.consume();
}

void Slider::mouseWheelMovedDown(MouseEvent &event)
{
 setValue(mValue - mStepLength);
 distributeActionEvent();
 event.consume();
}

void Slider::keyPressed(KeyEvent& event)
{
 const InputActionT action = event.getActionId();

 if (mOrientation == Orientation::HORIZONTAL)
 {
 if (action == InputAction::GUI_RIGHT)
 {
 setValue(mValue + mStepLength);
 distributeActionEvent();
 event.consume();
 }
 else if (action == InputAction::GUI_LEFT)
 {
 setValue(mValue - mStepLength);
 distributeActionEvent();
 event.consume();
 }
 }
 else
 {
 if (action == InputAction::GUI_UP)
 {
 setValue(mValue + mStepLength);
 distributeActionEvent();
 event.consume();
 }
 else if (action == InputAction::GUI_DOWN)
 {
 setValue(mValue - mStepLength);
 distributeActionEvent();
 event.consume();
 }
 }
}

void Slider::setScale(const double scaleStart, const double scaleEnd)
{
 mScaleStart = scaleStart;
 mScaleEnd = scaleEnd;
}

void Slider::setValue(const double value)
{
 mRedraw = true;
 if (value > mScaleEnd)
 mValue = mScaleEnd;
 else if (value < mScaleStart)
 mValue = mScaleStart;
 else
 mValue = value;
 mValue = CAST_S32((mValue - mScaleStart) / mStepLength)
 * mStepLength + mScaleStart;
}

double Slider::markerPositionToValue(const int v) const
{
 int w;
 if (mOrientation == Orientation::HORIZONTAL)
 w = mDimension.width;
 else
 w = mDimension.height;

 const double pos = v / (static_cast<double>(w) - mMarkerLength);
 return (1.0 - pos) * mScaleStart + pos * mScaleEnd;
}

int Slider::valueToMarkerPosition(const double value) const
{
 int v;
 if (mOrientation == Orientation::HORIZONTAL)
 v = mDimension.width;
 else
 v = mDimension.height;

 const int w = CAST_S32((v - mMarkerLength)
 * (value - mScaleStart)
 / (mScaleEnd - mScaleStart));

 if (w < 0)
 return 0;

 if (w > v - mMarkerLength)
 return v - mMarkerLength;

 return w;
}