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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
* slider.cc
*
* Sat Nov 26 18:10:22 CET 2011
* Copyright 2011 Bent Bisballe Nyeng
* deva@aasimon.org
****************************************************************************/
/*
* This file is part of DrumGizmo.
*
* DrumGizmo is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* DrumGizmo 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with DrumGizmo; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "slider.h"
#include "painter.h"
#include <hugin.hpp>
#include <stdio.h>
namespace GUI
{
Slider::Slider(Widget* parent) : Widget(parent)
{
state = State::up;
current_value = 0.0;
maximum = 1.0;
minimum = 0.0;
}
void Slider::setValue(float new_value)
{
current_value = new_value;
if (current_value < 0.)
{
current_value = 0.;
}
else if (current_value > 1.0) {
current_value = 1.0;
}
redraw();
clickNotifier();
valueChangedNotifier(current_value);
}
float Slider::value() const
{
return current_value;
}
void Slider::setColour(Colour colour)
{
switch (colour) {
case Colour::Green:
active_inner_bar = &inner_bar_green;
break;
case Colour::Red:
active_inner_bar = &inner_bar_red;
break;
case Colour::Blue:
active_inner_bar = &inner_bar_blue;
break;
case Colour::Yellow:
active_inner_bar = &inner_bar_yellow;
break;
case Colour::Purple:
active_inner_bar = &inner_bar_purple;
break;
case Colour::Grey:
active_inner_bar = &inner_bar_grey;
break;
}
if (enabled) { inner_bar = active_inner_bar; }
}
void Slider::setEnabled(bool enabled)
{
this->enabled = enabled;
if (enabled) {
inner_bar = active_inner_bar;
}
else {
active_inner_bar = inner_bar;
inner_bar = &inner_bar_light_grey;
}
redraw();
}
void Slider::repaintEvent(RepaintEvent* repaintEvent)
{
Painter p(*this);
auto inner_offset = (current_value / maximum) * getControlWidth();
auto button_x = button_offset + inner_offset - (button.width() / 2);
auto button_y = (height() - button.height()) / 2;
// draw bar
bar.setSize(width(), height());
p.drawImage(0, 0, bar);
// draw inner bar
inner_bar->setSize(button_x - bar_boundary, height() - 2 * bar_boundary);
p.drawImage(bar_boundary, bar_boundary, *inner_bar);
// draw button
p.drawImage(button_x, button_y, button);
}
void Slider::buttonEvent(ButtonEvent* buttonEvent)
{
// Ignore everything except left clicks.
if(!enabled || buttonEvent->button != MouseButton::left)
{
return;
}
if(buttonEvent->direction == Direction::down)
{
state = State::down;
recomputeCurrentValue(buttonEvent->x);
redraw();
clickNotifier();
valueChangedNotifier(current_value);
}
if(buttonEvent->direction == Direction::up)
{
state = State::up;
recomputeCurrentValue(buttonEvent->x);
redraw();
clickNotifier();
valueChangedNotifier(current_value);
}
}
void Slider::mouseMoveEvent(MouseMoveEvent* mouseMoveEvent)
{
if(state == State::down)
{
recomputeCurrentValue(mouseMoveEvent->x);
redraw();
clickNotifier();
valueChangedNotifier(current_value);
}
}
void Slider::scrollEvent(ScrollEvent* scrollEvent)
{
if (!enabled) { return; }
current_value -= scrollEvent->delta/(float)getControlWidth();
if (current_value < 0.)
{
current_value = 0.;
}
else if (current_value > 1.0) {
current_value = 1.0;
}
redraw();
clickNotifier();
valueChangedNotifier(current_value);
}
std::size_t Slider::getControlWidth() const
{
if(width() < 2 * button_offset)
{
return 0;
}
return width() - 2 * button_offset;
}
void Slider::recomputeCurrentValue(float x)
{
if(x < button_offset)
{
current_value = 0;
}
else
{
current_value = (x - button_offset) / getControlWidth();
}
if (current_value < 0.)
{
current_value = 0.;
}
else if (current_value > 1.0) {
current_value = 1.0;
}
}
} // GUI::
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