src/colorSelector.cc

/*
 *  LDForge: LDraw parts authoring CAD
 *  Copyright (C) 2013, 2014 Santeri Piippo
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *  =====================================================================
 *
 *  colorSelectDialog.cxx: Color selector box.
 */

#include <QGraphicsScene>
#include <QGraphicsItem>
#include <QMouseEvent>
#include <QScrollBar>
#include <QColorDialog>
#include "main.h"
#include "mainWindow.h"
#include "colorSelector.h"
#include "colors.h"
#include "configuration.h"
#include "miscallenous.h"
#include "ui_colorsel.h"

static const int g_numColumns = 16;
static const int g_squareSize = 32;

EXTERN_CFGENTRY (String, mainColor);
EXTERN_CFGENTRY (Float, mainColorAlpha);

// =============================================================================
//
ColorSelector::ColorSelector (LDColor defval, QWidget* parent) : QDialog (parent)
{
	m_firstResize = true;
	ui = new Ui_ColorSelUI;
	ui->setupUi (this);

	m_scene = new QGraphicsScene;
	ui->viewport->setScene (m_scene);
	setSelection (defval);

	// not really an icon but eh
	m_scene->setBackgroundBrush (getIcon ("checkerboard"));
	drawScene();

	int width = viewportWidth();
	ui->viewport->setMinimumWidth (width);
	ui->viewport->setMaximumWidth (width);

	connect (ui->directColor, SIGNAL (clicked (bool)), this, SLOT (chooseDirectColor()));
	connect (ui->transparentDirectColor, SIGNAL (clicked (bool)), this, SLOT (transparentCheckboxClicked()));

	drawColorInfo();
}

// =============================================================================
//
ColorSelector::~ColorSelector()
{
	delete ui;
}

// =============================================================================
//
void ColorSelector::drawScene()
{
	const int numCols = g_numColumns;
	const int square = g_squareSize;
	const int g_maxHeight = (numRows() * square);
	QRect sceneRect (0, 0, viewportWidth(), g_maxHeight);

	m_scene->setSceneRect (sceneRect);
	ui->viewport->setSceneRect (sceneRect);

	const double penWidth = 1.0f;

	// Draw the color rectangles.
	m_scene->clear();

	for (int i = 0; i < numLDConfigColors(); ++i)
	{
		LDColor info = LDColor::fromIndex (i);

		if (info == null)
			continue;

		const double x = (i % numCols) * square;
		const double y = (i / numCols) * square;
		const double w = square - (penWidth / 2);

		QColor col (info->faceColor());

		if (i == mainColorIndex)
		{
			// Use the user preferences for main color here
			col = QColor (cfg::mainColor);
			col.setAlpha (cfg::mainColorAlpha * 255.0f);
		}

		QPen pen (info->edgeColor(), penWidth, Qt::SolidLine, Qt::FlatCap, Qt::MiterJoin);
		m_scene->addRect (x, y, w, w, pen, col);
		QGraphicsTextItem* numtext = m_scene->addText (format ("%1", i));
		numtext->setDefaultTextColor ((luma (col) < 80) ? Qt::white : Qt::black);
		numtext->setPos (x, y);

		if (selection() && i == selection()->index())
		{
			auto curspic = m_scene->addPixmap (getIcon ("colorcursor"));
			curspic->setPos (x, y);
		}
	}
}

// =============================================================================
//
int ColorSelector::numRows() const
{
	return (numLDConfigColors() / g_numColumns);
}

// =============================================================================
//
int ColorSelector::viewportWidth() const
{
	return g_numColumns * g_squareSize + 21;
}

// =============================================================================
//
void ColorSelector::drawColorInfo()
{
	if (selection() == null)
	{
		ui->colorLabel->setText ("---");
		ui->iconLabel->setPixmap (null);
		ui->transparentDirectColor->setChecked (false);
		return;
	}

	ui->colorLabel->setText (format ("%1 - %2", selection()->indexString(),
		(selection()->isDirect() ? "<direct color>" : selection()->name())));
	ui->iconLabel->setPixmap (makeColorIcon (selection(), 16).pixmap (16, 16));
	ui->transparentDirectColor->setEnabled (selection()->isDirect());
	ui->transparentDirectColor->setChecked (selection()->isDirect() && selection()->faceColor().alphaF() < 1.0);
}

// =============================================================================
//
void ColorSelector::resizeEvent (QResizeEvent*)
{
	// If this is the first resize, check if we need to scroll down to see the
	// currently selected color. We cannot do this in the constructor because the
	// height is not set properly there. Though don't do this if we selected a
	// direct color.
	if (m_firstResize && selection()->index() >= numLDConfigColors())
	{
		int visibleColors = (ui->viewport->height() / g_squareSize) * g_numColumns;

		if (selection() && selection()->index() >= visibleColors)
		{
			int y = (selection()->index() / g_numColumns) * g_squareSize;
			ui->viewport->verticalScrollBar()->setValue (y);
		}
	}

	m_firstResize = false;
	drawScene();
}

// =============================================================================
//
void ColorSelector::mousePressEvent (QMouseEvent* event)
{
	QPointF scenepos = ui->viewport->mapToScene (event->pos());

	int x = (scenepos.x() - (g_squareSize / 2)) / g_squareSize;
	int y = (scenepos.y() - (g_squareSize / 2)) / g_squareSize;
	int idx = (y * g_numColumns) + x;

	LDColor col = LDColor::fromIndex (idx);

	if (not col)
		return;

	setSelection (col);
	drawScene();
	drawColorInfo();
}

// =============================================================================
//
void ColorSelector::selectDirectColor (QColor col)
{
	int32 idx = (ui->transparentDirectColor->isChecked() ? 0x03000000 : 0x02000000);
	idx |= (col.red() << 16) | (col.green() << 8) | (col.blue());
	setSelection (LDColor::fromIndex (idx));
	drawColorInfo();
}

// =============================================================================
//
void ColorSelector::chooseDirectColor()
{
	QColor defcolor = selection() != null ? selection()->faceColor() : Qt::white;
	QColor newcolor = QColorDialog::getColor (defcolor);

	if (not newcolor.isValid())
		return; // canceled

	selectDirectColor (newcolor);
}

// =============================================================================
//
void ColorSelector::transparentCheckboxClicked()
{
	if (selection() == null || not selection()->isDirect())
		return;

	selectDirectColor (selection()->faceColor());
}

// =============================================================================
//
bool ColorSelector::selectColor (LDColor& val, LDColor defval, QWidget* parent)
{
	ColorSelector dlg (defval, parent);

	if (dlg.exec() && dlg.selection() != null)
	{
		val = dlg.selection();
		return true;
	}

	return false;
}