From 645250e1cd8ce9bc1faea599df7a1b05836bfeb8 Mon Sep 17 00:00:00 2001
From: Bent Bisballe Nyeng <deva@aasimon.org>
Date: Tue, 29 Dec 2020 16:09:43 +0100
Subject: Split UI code into application/plugin UI and UI library.

---
 dggui/scrollbar.cc | 214 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 214 insertions(+)
 create mode 100644 dggui/scrollbar.cc

(limited to 'dggui/scrollbar.cc')

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::
-- 
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