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Diffstat (limited to 'dggui/slider.cc')
| -rw-r--r-- | dggui/slider.cc | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/dggui/slider.cc b/dggui/slider.cc new file mode 100644 index 0000000..15a82b3 --- /dev/null +++ b/dggui/slider.cc @@ -0,0 +1,217 @@ +/* -*- 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:: |