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OpenBoard/src/gui/UBDocumentNavigator.cpp

436 lines
11 KiB

13 years ago
/*
* 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 <QList>
#include <QPointF>
#include <QPixmap>
#include <QTransform>
#include <QScrollBar>
#include <QFontMetrics>
#include <QGraphicsItem>
#include <QGraphicsPixmapItem>
#include "core/UBApplication.h"
#include "UBDocumentNavigator.h"
#include "board/UBBoardController.h"
#include "adaptors/UBThumbnailAdaptor.h"
#include "adaptors/UBSvgSubsetAdaptor.h"
#include "document/UBDocumentController.h"
#include "domain/UBGraphicsScene.h"
#include "core/memcheck.h"
/**
* \brief Constructor
* @param parent as the parent widget
* @param name as the object name
*/
UBDocumentNavigator::UBDocumentNavigator(QWidget *parent, const char *name):QGraphicsView(parent)
, mScene(NULL)
, mCrntItem(NULL)
, mCrntDoc(NULL)
, mNbColumns(1)
, mThumbnailWidth(0)
, mThumbnailMinWidth(100)
, bNavig(false)
{
setObjectName(name);
mScene = new QGraphicsScene(this);
setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
setScene(mScene);
mThumbnailWidth = width() - 2*border();
connect(UBApplication::boardController, SIGNAL(activeSceneChanged()), this, SLOT(addNewPage()));
connect(mScene, SIGNAL(selectionChanged()), this, SLOT(onSelectionChanged()));
}
/**
* \brief Destructor
*/
UBDocumentNavigator::~UBDocumentNavigator()
{
if(NULL != mCrntItem)
{
delete mCrntItem;
mCrntItem = NULL;
}
if(NULL != mScene)
{
delete mScene;
mScene = NULL;
}
}
/**
* \brief Set the current document
* @param document as the new document
*/
void UBDocumentNavigator::setDocument(UBDocumentProxy *document)
{
// Here we set a new document to the navigator. We must clear the current
// content and add all the pages of the given document.
if(document)
{
mCrntDoc = document;
generateThumbnails();
}
}
/**
* \brief Generate the thumbnails
*/
void UBDocumentNavigator::generateThumbnails()
{
QList<QGraphicsItem*> items;
//QList<QUrl> itemsPath;
QStringList labels;
// Get the thumbnails
QList<QPixmap> thumbs = UBThumbnailAdaptor::load(mCrntDoc);
QGraphicsPixmapItem* selection = NULL;
for(int i = 0; i < thumbs.count(); i++)
{
QPixmap pix = thumbs.at(i);
QGraphicsPixmapItem* pixmapItem = new UBSceneThumbnailPixmap(pix, mCrntDoc, i);
// Get the selected item
if(UBApplication::boardController->activeSceneIndex() == i)
{
selection = pixmapItem;
mCrntItem = dynamic_cast<UBSceneThumbnailPixmap*>(pixmapItem);
mCrntItem->setSelected(true);
}
items << pixmapItem;
labels << tr("Page %0").arg(i + 1);
//itemsPath.append(QUrl::fromLocalFile(mCrntDoc->persistencePath() + QString("/pages/%0").arg(i + 1)));
}
// Draw the items
setGraphicsItems(items, labels);
}
/**
* \brief Refresh the given thumbnail
* @param iPage as the given page related thumbnail
*/
void UBDocumentNavigator::updateSpecificThumbnail(int iPage)
{
// Generate the new thumbnail
UBGraphicsScene* pScene = UBApplication::boardController->activeScene();
if(NULL != pScene)
{
// Save the current state of the scene
pScene->setModified(true);
UBSvgSubsetAdaptor::persistScene(mCrntDoc,pScene, iPage);
UBThumbnailAdaptor::persistScene(mCrntDoc->persistencePath(), pScene, iPage);
// Load it
QList<QPixmap> thumbs = UBThumbnailAdaptor::load(mCrntDoc);
QPixmap pix = thumbs.at(iPage);
QGraphicsPixmapItem* pixmapItem = new UBSceneThumbnailPixmap(pix, mCrntDoc, iPage);
if(pixmapItem)
{
// Get the old thumbnail
QGraphicsItem* pItem = mThumbnails.at(iPage);
if(NULL != pItem)
{
mScene->removeItem(pItem);
mScene->addItem(pixmapItem);
mThumbnails.replace(iPage, pixmapItem);
}
}
}
}
/**
* \brief Add a new page to the thumbnails list
*
* This method is called automatically by the board controller each time the user
* adds a new page, duplicates a page or imports a document.
*/
void UBDocumentNavigator::addNewPage()
{
if(!bNavig)
{
generateThumbnails();
if(NULL != mCrntItem)
{
mCrntItem->setSelected(true);
}
}
}
/**
* \brief Set the graphics items of the scene
* @param items as the items list
* @param labels as the page labels
*/
void UBDocumentNavigator::setGraphicsItems(QList<QGraphicsItem *> items, QStringList labels)
{
mThumbnails = items;
mLab = labels;
// First, clear the actual thumbnails
foreach(QGraphicsItem* it, mScene->items())
{
mScene->removeItem(it);
delete it;
}
// Add the new thumbnails
foreach(QGraphicsItem* it, items)
{
mScene->addItem(it);
}
// Add the labels
mLabels.clear();
foreach(QString lb, labels)
{
UBThumbnailTextItem *labelItem = new UBThumbnailTextItem(lb);
mScene->addItem(labelItem);
mLabels << labelItem;
}
// Refresh the scene
refreshScene();
}
/**
* \brief Put the element in the right place in the scene.
*/
void UBDocumentNavigator::refreshScene()
{
int labelSpacing = 0;
if(mLabels.size() > 0)
{
QFontMetrics fm(mLabels.at(0)->font());
labelSpacing = UBSettings::thumbnailSpacing + fm.height();
}
qreal thumbnailHeight = mThumbnailWidth / UBSettings::minScreenRatio;
for(int i = 0; i < mThumbnails.size(); i++)
{
// Get the item
QGraphicsItem* item = mThumbnails.at(i);
// Compute the scale factor
qreal scaleWidth = mThumbnailWidth / item->boundingRect().width();
qreal scaleHeight = thumbnailHeight / item->boundingRect().height();
qreal scaleFactor = qMin(scaleWidth, scaleHeight);
UBThumbnail* pix = dynamic_cast<UBThumbnail*>(item);
if(pix)
{
scaleFactor = qMin(scaleFactor, 1.0);
}
QTransform transform;
transform.scale(scaleFactor, scaleFactor);
// Apply the scaling
item->setTransform(transform);
item->setFlag(QGraphicsItem::ItemIsSelectable, true);
int columnIndex = i % mNbColumns;
int rowIndex = i / mNbColumns;
if(pix)
{
pix->setColumn(columnIndex);
pix->setRow(rowIndex);
}
int w = item->boundingRect().width();
int h = item->boundingRect().height();
QPointF pos( border() + (mThumbnailWidth - w * scaleFactor) / 2 + columnIndex * (mThumbnailWidth + border()),
border() + rowIndex * (thumbnailHeight + border() + labelSpacing) + (thumbnailHeight - h * scaleFactor) / 2);
item->setPos(pos);
// Add the labels "Page x"
if(mLabels.size() > i)
{
QFontMetrics fm(mLabels.at(i)->font(), this);
QString elidedText = fm.elidedText(mLab.at(i), Qt::ElideRight, mThumbnailWidth);
mLabels.at(i)->setPlainText(elidedText);
mLabels.at(i)->setWidth(fm.width(elidedText) + 2 * mLabels.at(i)->document()->documentMargin());
pos.setY(pos.y() + (thumbnailHeight + h * scaleFactor) / 2 + 5); // What is this 5 ??
qreal labelWidth = fm.width(elidedText);
pos.setX(border() + (mThumbnailWidth - labelWidth) / 2 + columnIndex * (mThumbnailWidth + border()));
mLabels.at(i)->setPos(pos);
}
}
QScrollBar *vertScrollBar = verticalScrollBar();
int scrollBarThickness = 0;
if (vertScrollBar && vertScrollBar->isVisible())
scrollBarThickness = vertScrollBar->width();
}
/**
* \brief Set the number of thumbnails columns
* @param nbColumns as the number of columns
*/
void UBDocumentNavigator::setNbColumns(int nbColumns)
{
mNbColumns = nbColumns;
}
/**
* \brief Get the number of columns
* @return the number of thumbnails columns
*/
int UBDocumentNavigator::nbColumns()
{
return mNbColumns;
}
/**
* \brief Set the thumbnails minimum width
* @param width as the minimum width
*/
void UBDocumentNavigator::setThumbnailMinWidth(int width)
{
mThumbnailMinWidth = width;
}
/**
* \brief Get the thumbnails minimum width
* @return the minimum thumbnails width
*/
int UBDocumentNavigator::thumbnailMinWidth()
{
return mThumbnailMinWidth;
}
/**
* \brief Get the border size
* @return the border size in pixels
*/
int UBDocumentNavigator::border()
{
return 20;
}
/**
* \brief Handle the resize event
* @param event as the resize event
*/
void UBDocumentNavigator::resizeEvent(QResizeEvent *event)
{
Q_UNUSED(event);
// Update the thumbnails width
mThumbnailWidth = (width() > mThumbnailMinWidth) ? width() - 2*border() : mThumbnailMinWidth;
// Update the scene rect
// QRect sceneRect;
// sceneRect.setWidth(width() - 2*border());
// sceneRect.setHeight(height() - 2*border());
// sceneRect.moveLeft(border());
// sceneRect.moveTop(border());
// scene()->setSceneRect(sceneRect);
// Refresh the scene
refreshScene();
}
/**
* \brief Handle the mouse press event
* @param event as the mouse event
*/
void UBDocumentNavigator::mousePressEvent(QMouseEvent *event)
{
QGraphicsItem* pClickedItem = itemAt(event->pos());
if(NULL != pClickedItem)
{
bNavig = true;
// First, select the clicked item
UBSceneThumbnailPixmap* pCrntItem = dynamic_cast<UBSceneThumbnailPixmap*>(pClickedItem);
if(NULL == pCrntItem)
{
// If we fall here we may have clicked on the label instead of the thumbnail
UBThumbnailTextItem* pTextItem = dynamic_cast<UBThumbnailTextItem*>(pClickedItem);
if(NULL != pTextItem)
{
pCrntItem = dynamic_cast<UBSceneThumbnailPixmap*>(mThumbnails.at(mLabels.indexOf(pTextItem)));
}
}
else
{
if(NULL != mCrntItem && mCrntItem != pCrntItem)
{
// Unselect the previous item
int iOldPage = mThumbnails.indexOf(mCrntItem);
mCrntItem->setSelected(false);
updateSpecificThumbnail(iOldPage);
mCrntItem = pCrntItem;
}
pCrntItem->setSelected(true);
// Then display the related page
emit changeCurrentPage();
refreshScene();
}
bNavig = false;
}
}
/**
* \brief Get the selected page number
* @return the selected page number
*/
int UBDocumentNavigator::selectedPageNumber()
{
int nbr = NO_PAGESELECTED;
if(NULL != mCrntItem)
{
nbr = mThumbnails.indexOf(mCrntItem);
}
return nbr;
}
/**
* \brief Get the current document
* @return the current document
*/
UBDocumentProxy* UBDocumentNavigator::currentDoc()
{
return mCrntDoc;
}
/**
* \brief Occurs when the selection changed
*/
void UBDocumentNavigator::onSelectionChanged()
{
// QList<QGraphicsItem*> qlItems = mScene->selectedItems();
// qDebug() << "The number of selected items is " << qlItems.count();
}