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OpenBoard/src/gui/UBDocumentThumbnailWidget.cpp

258 lines
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/*
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.
*
13 years ago
* 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 "UBDocumentThumbnailWidget.h"
#include "core/UBApplication.h"
#include "core/UBMimeData.h"
#include "core/UBSettings.h"
#include "core/memcheck.h"
UBDocumentThumbnailWidget::UBDocumentThumbnailWidget(QWidget* parent)
: UBThumbnailWidget(parent)
, mDropCaretRectItem(0)
, mClosestDropItem(0)
, mDragEnabled(true)
{
// NOOP
}
UBDocumentThumbnailWidget::~UBDocumentThumbnailWidget()
{
// NOOP
}
void UBDocumentThumbnailWidget::mouseMoveEvent(QMouseEvent *event)
{
if (!dragEnabled())
{
event->ignore();
return;
}
if (!(event->buttons() & Qt::LeftButton))
return;
if ((event->pos() - mMousePressPos).manhattanLength()
< QApplication::startDragDistance())
return;
QList<QGraphicsItem*> graphicsItems = items(mMousePressPos);
UBSceneThumbnailPixmap* sceneItem = 0;
while (!graphicsItems.isEmpty() && !sceneItem)
{
sceneItem = dynamic_cast<UBSceneThumbnailPixmap*>(graphicsItems.takeFirst());
}
if (sceneItem)
{
QDrag *drag = new QDrag(this);
QList<UBMimeDataItem> mimeDataItems;
foreach (QGraphicsItem *item, selectedItems())
mimeDataItems.append(UBMimeDataItem(sceneItem->proxy(), mGraphicItems.indexOf(item)));
UBMimeData *mime = new UBMimeData(mimeDataItems);
drag->setMimeData(mime);
drag->setPixmap(sceneItem->pixmap().scaledToWidth(100));
drag->setHotSpot(QPoint(drag->pixmap().width()/2,
drag->pixmap().height() / 2));
drag->exec(Qt::MoveAction);
}
UBThumbnailWidget::mouseMoveEvent(event);
}
void UBDocumentThumbnailWidget::dragEnterEvent(QDragEnterEvent *event)
{
if (!event->mimeData()->hasFormat(UBApplication::mimeTypeUniboardPage))
{
event->setDropAction(Qt::IgnoreAction);
event->ignore();
return;
}
UBThumbnailWidget::dragEnterEvent(event);
}
void UBDocumentThumbnailWidget::dragLeaveEvent(QDragLeaveEvent *event)
{
Q_UNUSED(event);
deleteDropCaret();
}
void UBDocumentThumbnailWidget::dragMoveEvent(QDragMoveEvent *event)
{
QList<UBSceneThumbnailPixmap*> pixmapItems;
foreach (QGraphicsItem *item, scene()->items(mapToScene(frameRect())))
{
UBSceneThumbnailPixmap* sceneItem = dynamic_cast<UBSceneThumbnailPixmap*>(item);
if (sceneItem)
pixmapItems.append(sceneItem);
}
int minDistance = 0;
QGraphicsItem *underlyingItem = itemAt(event->pos());
mClosestDropItem = dynamic_cast<UBSceneThumbnailPixmap*>(underlyingItem);
if (!mClosestDropItem)
{
foreach (UBSceneThumbnailPixmap *item, pixmapItems)
{
qreal scale = item->transform().m11();
QPointF itemCenter(
item->pos().x() + item->boundingRect().width() * scale / 2,
item->pos().y() + item->boundingRect().height() * scale / 2);
int distance = (itemCenter.toPoint() - mapToScene(event->pos()).toPoint()).manhattanLength();
if (!mClosestDropItem || distance < minDistance)
{
mClosestDropItem = item;
minDistance = distance;
}
}
}
if (mClosestDropItem)
{
qreal scale = mClosestDropItem->transform().m11();
QPointF itemCenter(
mClosestDropItem->pos().x() + mClosestDropItem->boundingRect().width() * scale / 2,
mClosestDropItem->pos().y() + mClosestDropItem->boundingRect().height() * scale / 2);
mDropIsRight = mapToScene(event->pos()).x() > itemCenter.x();
if (!mDropCaretRectItem && selectedItems().count() < mGraphicItems.count())
{
mDropCaretRectItem = new QGraphicsRectItem(0, scene());
mDropCaretRectItem->setPen(QPen(Qt::darkGray));
mDropCaretRectItem->setBrush(QBrush(Qt::lightGray));
}
QRectF dropCaretRect(
mDropIsRight ? mClosestDropItem->pos().x() + mClosestDropItem->boundingRect().width() * scale + spacing() / 2 - 1 : mClosestDropItem->pos().x() - spacing() / 2 - 1,
mClosestDropItem->pos().y(),
3,
mClosestDropItem->boundingRect().height() * scale);
if (mDropCaretRectItem)
mDropCaretRectItem->setRect(dropCaretRect);
}
event->acceptProposedAction();
}
void UBDocumentThumbnailWidget::dropEvent(QDropEvent *event)
{
deleteDropCaret();
if (mClosestDropItem)
{
int targetIndex = mDropIsRight ? mGraphicItems.indexOf(mClosestDropItem) + 1 : mGraphicItems.indexOf(mClosestDropItem);
QList<UBMimeDataItem> mimeDataItems;
if (event->mimeData()->hasFormat(UBApplication::mimeTypeUniboardPage))
{
const UBMimeData* mimeData = qobject_cast<const UBMimeData*>(event->mimeData());
if (mimeData)
mimeDataItems = mimeData->items();
}
if (1 == mimeDataItems.count() &&
(mimeDataItems.at(0).sceneIndex() == mGraphicItems.indexOf(mClosestDropItem) ||
targetIndex == mimeDataItems.at(0).sceneIndex() ||
targetIndex == mimeDataItems.at(0).sceneIndex() + 1))
{
return;
}
int sourceIndexOffset = 0;
int actualTargetIndex = targetIndex;
for (int i = mimeDataItems.count() - 1; i >= 0; i--)
{
UBMimeDataItem sourceItem = mimeDataItems.at(i);
int actualSourceIndex = sourceItem.sceneIndex();
if (sourceItem.sceneIndex() >= targetIndex)
actualSourceIndex += sourceIndexOffset;
event->acceptProposedAction();
if (sourceItem.sceneIndex() < targetIndex)
{
if (actualSourceIndex != actualTargetIndex - 1)
emit sceneDropped(sourceItem.documentProxy(), actualSourceIndex, actualTargetIndex - 1);
actualTargetIndex -= 1;
}
else
{
if (actualSourceIndex != actualTargetIndex)
emit sceneDropped(sourceItem.documentProxy(), actualSourceIndex, actualTargetIndex);
sourceIndexOffset += 1;
}
}
}
}
void UBDocumentThumbnailWidget::deleteDropCaret()
{
if (mDropCaretRectItem && scene())
{
scene()->removeItem(mDropCaretRectItem);
delete mDropCaretRectItem;
mDropCaretRectItem = 0;
}
}
void UBDocumentThumbnailWidget::setGraphicsItems(const QList<QGraphicsItem*>& pGraphicsItems,
const QList<QUrl>& pItemPaths, const QStringList pLabels,
const QString& pMimeType)
{
deleteDropCaret();
UBThumbnailWidget::setGraphicsItems(pGraphicsItems, pItemPaths, pLabels, pMimeType);
}
void UBDocumentThumbnailWidget::setDragEnabled(bool enabled)
{
mDragEnabled = enabled;
}
bool UBDocumentThumbnailWidget::dragEnabled() const
{
return mDragEnabled;
}
void UBDocumentThumbnailWidget::hightlightItem(int index)
{
if (0 <= index && index < mLabelsItems.length())
{
mLabelsItems.at(index)->highlight();
}
if (0 <= index && index < mGraphicItems.length())
{
UBSceneThumbnailPixmap *thumbnail = dynamic_cast<UBSceneThumbnailPixmap*>(mGraphicItems.at(index));
if (thumbnail)
thumbnail->highlight();
}
}