src/document.cpp

/*
 *  LDForge: LDraw parts authoring CAD
 *  Copyright (C) 2013 - 2020 Teemu 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/>.
 */

#include <QMouseEvent>
#include <QMessageBox>
#include "document.h"
#include "ui_document.h"
#include "model.h"
#include "modeleditcontext.h"
#include "tools/basetool.h"
#include "tools/drawtool.h"
#include "tools/selecttool.h"
#include "tools/transformtool.h"

static const QMetaObject* const toolMetaObjects[] = {
	&SelectTool::staticMetaObject,
	&DrawTool::staticMetaObject,
	&TransformTool::staticMetaObject,
};

Document::Document(
	Model* model,
	DocumentManager* documents,
	const ldraw::ColorTable& colorTable,
	QWidget* parent) :
	QWidget{parent},
	model{model},
	documents{documents},
	colorTable{colorTable},
	vertexMap{model},
	renderer{new Canvas{model, documents, colorTable, this}},
	ui{*new Ui::Document},
	toolsBar{new QToolBar{this}}
{
	this->ui.setupUi(this);
	this->ui.toolsBarContainer->setLayout(new QVBoxLayout{this->ui.toolsBarContainer});
	this->ui.toolsBarContainer->layout()->addWidget(this->toolsBar);
	this->ui.listView->setModel(model);
	this->ui.viewportFrame->setLayout(new QVBoxLayout{this->ui.listView});
	this->ui.viewportFrame->layout()->addWidget(this->renderer);
	this->toolsBar->setOrientation(Qt::Vertical);
	this->setMouseTracking(true);
	connect(this->ui.splitter, &QSplitter::splitterMoved, this, &Document::splitterChanged);
	connect(this->renderer, &Canvas::newStatusText, this, &Document::newStatusText);
	connect(this->renderer, &Canvas::selectionChanged, [&](const QSet<ldraw::id_t>& newSelection)
	{
		QItemSelectionModel* selectionModel = this->ui.listView->selectionModel();
		QItemSelection selection;
		for (ldraw::id_t id : newSelection)
		{
			QModelIndex index = this->model->lookup(id);
			if (index != QModelIndex{})
			{
				selection.select(index, index);
			}
		}
		QSignalBlocker blocker{this};
		selectionModel->select(selection, QItemSelectionModel::ClearAndSelect);
		this->selectionChanged(newSelection);
	});
	connect(this->ui.listView->selectionModel(), &QItemSelectionModel::selectionChanged,
		[&](const QItemSelection& selected, const QItemSelection& deselected)
	{
		auto resolveIndex = [this](const QModelIndex& index){ return this->model->resolve(index); };
		auto resolve = [resolveIndex](const QItemSelection& selection)
		{
			return fn::map<QSet<ldraw::id_t>>(selection.indexes(), resolveIndex);
		};
		this->renderer->handleSelectionChange(resolve(selected), resolve(deselected));
		this->selectionChanged(resolve(this->ui.listView->selectionModel()->selection()));
	});
	connect(this->model, &Model::dataChanged, this->renderer, qOverload<>(&Canvas::update));
	connect(this->renderer, &Canvas::mouseClick, this, [this](Canvas* canvas, QMouseEvent* event)
	{
		if (this->selectedTool != nullptr)
		{
			this->selectedTool->mouseClick(this, canvas, event);
		}
	});
	connect(this->renderer, &Canvas::mouseMove, this, [this](Canvas* canvas, QMouseEvent* event)
	{
		if (this->selectedTool != nullptr)
		{
			this->selectedTool->mouseMove(this, canvas, event);
		}
	});
	connect(&this->vertexMap, &VertexMap::verticesChanged, [&]()
	{
		this->renderer->rebuildVertices(this);
	});
	this->setCanvasOverpaintCallback([&](Canvas* canvas, QPainter* painter)
	{
		if (this->selectedTool != nullptr)
		{
			this->selectedTool->overpaint(canvas, painter);
		}
	});
	this->initializeTools();
}

Document::~Document()
{
	delete &this->ui;
}

QByteArray Document::saveSplitterState() const
{
	return this->ui.splitter->saveState();
}

void Document::restoreSplitterState(const QByteArray& state)
{
	this->ui.splitter->restoreState(state);
}

void Document::setRenderPreferences(const gl::RenderPreferences& newPreferences)
{
	this->renderer->setRenderPreferences(newPreferences);
}

void Document::setCanvasOverpaintCallback(Canvas::OverpaintCallback fn)
{
	this->renderer->setOverpaintCallback(fn);
}

Model::EditContext Document::editModel()
{
	return this->model->edit();
}

void Document::applyToVertices(VertexMap::ApplyFunction fn) const
{
	this->vertexMap.apply(fn);
}

void Document::selectionChanged(const QSet<ldraw::id_t>& newSelection)
{
	for (BaseTool* tool : this->tools)
	{
		tool->selectionChanged(newSelection);
	}
}

void Document::initializeTools()
{
	for (const QMetaObject* const metaObject : ::toolMetaObjects)
	{
		QObject* const objectInstance = metaObject->newInstance(Q_ARG(Model*, this->model), Q_ARG(QObject*, this));
		BaseTool* const toolInstance = qobject_cast<BaseTool*>(objectInstance);
		if (toolInstance)
		{
			this->tools.append(toolInstance);
			QAction* action = new QAction{toolInstance->name(), this};
			action->setCheckable(true);
			this->toolActions[toolInstance] = action;
			action->setToolTip(toolInstance->toolTip());
			connect(action, &QAction::triggered, this, &Document::toolActionTriggered);
			this->toolsBar->addAction(action);
			QWidget* const widget = toolInstance->toolWidget();
			if (widget)
			{
				this->ui.toolWidgetStack->addWidget(widget);
			}
			else
			{
				this->ui.toolWidgetStack->addWidget(new QWidget{this});
			}
		}
		else
		{
			QMessageBox::critical(this, tr("Error"), tr("Unable to construct %1").arg(metaObject->className()));
		}
	}
	this->selectTool(this->tools[0]);
}

void Document::toolActionTriggered()
{
	QAction* action = qobject_cast<QAction*>(sender());
	if (action != nullptr)
	{
		BaseTool* tool = nullptr;
		for (auto&& pair : items(this->toolActions))
		{
			if (pair.value == action)
			{
				tool = pair.key;
			}
		}
		this->selectTool(tool);
	}
}

void Document::selectTool(BaseTool* tool)
{
	if (tool != nullptr && tool != this->selectedTool)
	{
		if (this->selectedTool != nullptr)
		{
			this->selectedTool->reset();
		}
		this->selectedTool = tool;
		for (auto&& pair : items(this->toolActions))
		{
			pair.value->setChecked(pair.key == tool);
		}
		const int index = this->tools.indexOf(tool);
		if (index != -1)
		{
			this->ui.toolWidgetStack->setCurrentIndex(index);
		}
	}
}

void Document::handleKeyPress(QKeyEvent* event)
{
	if (this->selectedTool != nullptr)
	{
		this->selectedTool->keyReleased(this, this->renderer, event);
	}
}