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Diffstat (limited to 'dggui/scrollbar.cc')
| -rw-r--r-- | dggui/scrollbar.cc | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/dggui/scrollbar.cc b/dggui/scrollbar.cc new file mode 100644 index 0000000..9a17d1d --- /dev/null +++ b/dggui/scrollbar.cc @@ -0,0 +1,214 @@ +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/*************************************************************************** + * scrollbar.cc + * + * Sun Apr 14 12:54:58 CEST 2013 + * Copyright 2013 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 "scrollbar.h" + +#include <hugin.hpp> + +#include "painter.h" + +namespace GUI { + +ScrollBar::ScrollBar(Widget *parent) + : Widget(parent) +{ +} + +void ScrollBar::setRange(int r) +{ + rangeValue = r; + setValue(value()); + redraw(); +} + +int ScrollBar::range() +{ + return rangeValue; +} + +void ScrollBar::setMaximum(int m) +{ + maxValue = m; + if(maxValue < rangeValue) + { + rangeValue = maxValue; + } + setValue(value()); + redraw(); +} + +int ScrollBar::maximum() +{ + return maxValue; +} + +void ScrollBar::addValue(int delta) +{ + setValue(value() + delta); +} + +void ScrollBar::setValue(int value) +{ + if(value > (maxValue - rangeValue)) + { + value = maxValue - rangeValue; + } + + if(value < 0) + { + value = 0; + } + + if(currentValue == value) + { + return; + } + + currentValue = value; + + valueChangeNotifier(value); + + redraw(); +} + +int ScrollBar::value() +{ + return currentValue; +} + +//! Draw an up/down arrow at (x,y) with the bounding box size (w,h) +//! If h is negative the arrow will point down, if positive it will point up. +static void drawArrow(Painter &p, int x, int y, int w, int h) +{ + if(h < 0) + { + y -= h; + } + + p.drawLine(x, y, x + (w / 2), y + h); + p.drawLine(x + (w / 2), y + h, x + w, y); + + ++y; + p.drawLine(x, y, x + (w / 2), y + h); + p.drawLine(x + (w / 2), y + h, x + w, y); +} + +void ScrollBar::repaintEvent(RepaintEvent* repaintEvent) +{ + Painter p(*this); + + p.clear(); + + p.drawImageStretched(0, 0, bg_img, width(), height()); + + p.setColour(Colour(183.0f/255.0f, 219.0f/255.0f, 255.0f/255.0f, 1.0f)); + if(!maxValue) + { + return; + } + + { + int h = height() - 2 * width() - 3; + int offset = width() + 2; + + int y_val1 = (currentValue * h) / maxValue; + int y_val2 = ((currentValue + rangeValue) * h) / maxValue - 1; + + p.drawFilledRectangle(2, y_val1 + offset, width() - 1, y_val2 + offset); + } + + p.drawLine(0, 0, 0, height()); + + drawArrow(p, width()/4, width()/4, width()/2, -1 * (width()/3)); + p.drawLine(0, width(), width(), width()); + + drawArrow(p, width()/4, height() - width() + width()/4, width()/2, width()/3); + p.drawLine(0, height() - width(), width(), height() - width()); +} + +void ScrollBar::scrollEvent(ScrollEvent* scrollEvent) +{ + setValue(value() + scrollEvent->delta); +} + +void ScrollBar::mouseMoveEvent(MouseMoveEvent* mouseMoveEvent) +{ + if(!dragging) + { + return; + } + + float delta = yOffset - mouseMoveEvent->y; + + int h = height() - 2 * width() - 3; + delta /= (float)h / (float)maxValue; + + int newval = valueOffset - delta; + if(newval != value()) + { + setValue(newval); + } +} + +void ScrollBar::buttonEvent(ButtonEvent* buttonEvent) +{ + // Ignore everything except left clicks. + if(buttonEvent->button != MouseButton::left) + { + return; + } + + if((buttonEvent->y < (int)width()) && buttonEvent->y > 0) + { + if(buttonEvent->direction == Direction::down) + { + addValue(-1); + } + + return; + } + + if((buttonEvent->y > ((int)height() - (int)width())) && + (buttonEvent->y < (int)height())) + { + if(buttonEvent->direction == Direction::down) + { + addValue(1); + } + + return; + } + + if(buttonEvent->direction == Direction::down) + { + yOffset = buttonEvent->y; + valueOffset = value(); + } + + dragging = (buttonEvent->direction == Direction::down); +} + +} // GUI:: |