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https://bitbucket.org/mfeemster/fractorium.git
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2fba807777
-Query matrices when drawing affines even if they are set not to be drawn because the values are used elsewhere. -No longer need to move library items on a delayed timer when dragging and dropping.
96 lines
2.6 KiB
C++
96 lines
2.6 KiB
C++
#include "FractoriumPch.h"
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#include "LibraryTreeWidget.h"
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#include "Fractorium.h"
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/// <summary>
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/// Set a pointer to the main window.
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/// </summary>
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/// <param name="f">Pointer to the main Fractorium object</param>
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void LibraryTreeWidget::SetMainWindow(Fractorium* f)
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{
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m_Fractorium = f;
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}
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/// <summary>
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/// Process the drop event to allow for moving items around inside of the tree.
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/// </summary>
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/// <param name="de">Pointer to the QDropEvent object</param>
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void LibraryTreeWidget::dropEvent(QDropEvent* de)
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{
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QModelIndex droppedIndex = indexAt(de->pos());
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auto items = selectionModel()->selectedRows();
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if (!droppedIndex.isValid())//Don't process drop because it's outside of the droppable area.
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{
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de->ignore();
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return;
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}
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else if (!items.empty())//Actually do the drop and move the item to a new location.
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{
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// get the list of the items that are about to be dragged
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int i, row = droppedIndex.row();
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DropIndicatorPosition dp = dropIndicatorPosition();
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QList<QTreeWidgetItem*> dragItems = selectedItems();
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if (dp == QAbstractItemView::BelowItem)
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row++;
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auto itemat = this->itemFromIndex(droppedIndex);
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QTreeWidget::dropEvent(de);//This internally changes the order of the items.
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//Qt has a long standing major bug that rearranges the order of disjoint selections when
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//The drop location is in between the disjoint regions.
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//This is an attempt to correct for that bug by removing the dropped items, then re-inserting them
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//in the order they were selected.
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//This bug remains present as of Qt 5.8: https://bugreports.qt.io/browse/QTBUG-45320
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if (auto top = topLevelItem(0))
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{
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if (itemat)
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{
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auto offsetitem = this->indexFromItem(itemat);
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if (dp == QAbstractItemView::BelowItem)
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{
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auto itemrow = offsetitem.row() + 1;
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for (i = 0; i < dragItems.size(); i++)
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{
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if (itemrow < top->childCount())
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top->takeChild(itemrow);
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}
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for (i = 0; i < dragItems.size(); i++)
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{
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auto offset = i + itemrow;
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if (offset <= top->childCount())
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top->insertChild(offset, dragItems[i]);
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}
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}
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else
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{
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auto itemrow = offsetitem.row();//Will be at least 1 if dropped above it.
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auto offset = itemrow;
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for (i = 0; i < dragItems.size() && offset > 0; i++)
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{
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offset--;
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if (offset < top->childCount())
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top->takeChild(offset);
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}
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for (i = 0; i < dragItems.size(); i++)
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{
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if (offset <= top->childCount())
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top->insertChild(offset, dragItems[i]);
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offset++;
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}
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}
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}
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}
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m_Fractorium->m_Controller->MoveLibraryItems(items, row);
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}
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} |