Split UI code into application/plugin UI and UI library.

1 files changed, 255 insertions, 0 deletions

diff --git a/dggui/knob.cc b/dggui/knob.cc
new file mode 100644
index 0000000..25200a7
--- /dev/null
+++ b/dggui/knob.cc
@@ -0,0 +1,255 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ *            knob.cc
+ *
+ *  Thu Feb 28 07:37:27 CET 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 "knob.h"
+
+#include "painter.h"
+
+#include <hugin.hpp>
+#include <cmath>
+
+namespace
+{
+const double pi = std::atan(1.0) * 4.0;
+}
+
+namespace GUI
+{
+
+Knob::Knob(Widget *parent)
+	: Widget(parent)
+	, img_knob(getImageCache(), ":resources/knob.png")
+{
+	state = up;
+
+	maximum = 1.0;
+	minimum = 0.0;
+
+	current_value = 0.0;
+
+	mouse_offset_x = 0;
+}
+
+void Knob::setValue(float value)
+{
+	value -= minimum;
+	value /= (maximum - minimum);
+	internalSetValue(value);
+}
+
+void Knob::setDefaultValue(float value)
+{
+	default_value = value;
+}
+
+void Knob::setRange(float minimum, float maximum)
+{
+	this->minimum = minimum;
+	this->maximum = maximum;
+	internalSetValue(current_value);
+}
+
+float Knob::value()
+{
+	return current_value * (maximum - minimum) + minimum;
+}
+
+void Knob::showValue(bool show_value)
+{
+	this->show_value = show_value;
+}
+
+void Knob::scrollEvent(ScrollEvent* scrollEvent)
+{
+	float value = (current_value - (scrollEvent->delta / 200.0));
+	internalSetValue(value);
+}
+
+void Knob::mouseMoveEvent(MouseMoveEvent* mouseMoveEvent)
+{
+	if(state == down)
+	{
+		if(mouse_offset_x == (mouseMoveEvent->x + (-1 * mouseMoveEvent->y)))
+		{
+			return;
+		}
+
+		float dval =
+			mouse_offset_x - (mouseMoveEvent->x + (-1 * mouseMoveEvent->y));
+		float value = current_value - (dval / 300.0);
+
+		internalSetValue(value);
+
+		mouse_offset_x = mouseMoveEvent->x + (-1 * mouseMoveEvent->y);
+	}
+}
+
+void Knob::keyEvent(KeyEvent* keyEvent)
+{
+	if(keyEvent->direction != Direction::up)
+	{
+		return;
+	}
+
+	float value = current_value;
+	switch(keyEvent->keycode) {
+	case Key::up:
+		value += 0.01;
+		break;
+	case Key::down:
+		value -= 0.01;
+		break;
+	case Key::right:
+		value += 0.01;
+		break;
+	case Key::left:
+		value -= 0.01;
+		break;
+	case Key::home:
+		value = 0;
+		break;
+	case Key::end:
+		value = 1;
+		break;
+	default:
+		break;
+	}
+
+	internalSetValue(value);
+}
+
+void Knob::buttonEvent(ButtonEvent* buttonEvent)
+{
+	// Ignore everything except left clicks.
+	if(buttonEvent->button != MouseButton::left)
+	{
+		return;
+	}
+
+	if(buttonEvent->doubleClick)
+	{
+		float value = default_value;
+		value -= minimum;
+		value /= (maximum - minimum);
+		internalSetValue(value);
+		return;
+	}
+
+	if(buttonEvent->direction == Direction::down)
+	{
+		state = down;
+		mouse_offset_x = buttonEvent->x + (-1 * buttonEvent->y);
+		return;
+	}
+
+	if(buttonEvent->direction == Direction::up)
+	{
+		state = up;
+		mouse_offset_x = buttonEvent->x + (-1 * buttonEvent->y);
+		clicked();
+		return;
+	}
+}
+
+void Knob::repaintEvent(RepaintEvent* repaintEvent)
+{
+	int diameter = (width()>height()?height():width());
+	int radius = diameter / 2;
+	int center_x = width() / 2;
+	int center_y = height() / 2;
+
+	Painter p(*this);
+	p.clear();
+
+	p.drawImageStretched(0, 0, img_knob, diameter, diameter);
+
+	float range = maximum - minimum;
+
+	if (show_value) {
+		// Show 0, 1 or 2 decimal point depending on the size of the range
+		char buf[64];
+		if(range> 100.0f)
+		{
+			sprintf(buf, "%.0f", current_value * range + minimum);
+		}
+		else if(range > 10.0f)
+		{
+			sprintf(buf, "%.1f", current_value * range + minimum);
+		}
+		else
+		{
+			sprintf(buf, "%.2f", current_value * range + minimum);
+		}
+		p.drawText(center_x - font.textWidth(buf) / 2 + 1,
+				   center_y + font.textHeight(buf) / 2 + 1, font, buf);
+	}
+
+	// Make it start from 20% and stop at 80%
+	double padval = current_value * 0.8 + 0.1;
+
+	double from_x = sin((-1 * padval + 1) * 2 * pi) * radius * 0.6;
+	double from_y = cos((-1 * padval + 1) * 2 * pi) * radius * 0.6;
+
+	double to_x = sin((-1 * padval + 1) * 2 * pi) * radius * 0.8;
+	double to_y = cos((-1 * padval + 1) * 2 * pi) * radius * 0.8;
+
+	// Draw "fat" line by drawing 9 lines with moved start/ending points.
+	p.setColour(Colour(1.0f, 0.0f, 0.0f, 1.0f));
+	for(int _x = -1; _x < 2; _x++)
+	{
+		for(int _y = -1; _y < 2; _y++)
+		{
+			p.drawLine(from_x + center_x + _x,
+			           from_y + center_y + _y,
+			           to_x + center_x + _x,
+			           to_y + center_y + _y);
+		}
+	}
+}
+
+void Knob::internalSetValue(float new_value)
+{
+	if(new_value < 0.0)
+	{
+	  new_value = 0.0;
+	}
+
+	if(new_value > 1.0)
+	{
+		new_value = 1.0;
+	}
+
+	if(new_value == current_value)
+	{
+		return;
+	}
+
+	current_value = new_value;
+	valueChangedNotifier(value());
+	redraw();
+}
+
+} // GUI::