65 lines
1.6 KiB
C++
65 lines
1.6 KiB
C++
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#include "operationCommand.h"
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#include <QGraphicsItem>
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AddItemCommand::AddItemCommand(QGraphicsItem* item, QGraphicsScene* scene, QUndoCommand* parent)
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: QUndoCommand(parent)
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{
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m_pItem = item;
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m_itemPos = item->pos();
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m_pGraphicsScene = scene;
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}
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AddItemCommand::~AddItemCommand()
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{
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}
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void AddItemCommand::undo()
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{
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m_pGraphicsScene->removeItem(m_pItem);
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m_pGraphicsScene->update();
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}
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void AddItemCommand::redo()
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{
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if(m_pItem->scene()) //因为添加图元后同步创建一条该指令，平且在push进入stack的时候redo会被触发一次，因此这里加判断，防止重复操作
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return;
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m_pGraphicsScene->addItem(m_pItem);
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m_pItem->setPos(m_itemPos);
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m_pGraphicsScene->update();
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}
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DeleteItemCommand::DeleteItemCommand(QGraphicsScene* scene, QUndoCommand* parent)
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: QUndoCommand(parent)
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{
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m_pGraphicsScene = scene;
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m_listItem = scene->selectedItems();
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}
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DeleteItemCommand::~DeleteItemCommand()
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{
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}
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void DeleteItemCommand::undo()
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{
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foreach(QGraphicsItem* item, m_listItem)
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{
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QGraphicsItemGroup* group = dynamic_cast<QGraphicsItemGroup*>(item->parentItem());
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if(!group)
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{
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m_pGraphicsScene->addItem(item);
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}
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}
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m_pGraphicsScene->update();
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}
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void DeleteItemCommand::redo()
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{
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foreach(QGraphicsItem* item, m_listItem)
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{
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QGraphicsItemGroup* group = dynamic_cast<QGraphicsItemGroup*>(item->parentItem());
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if(!group)
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{
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m_pGraphicsScene->removeItem(item); //remove即可，不要delete，因为会影响撤回（undo）操作
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}
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}
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m_pGraphicsScene->update();
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}
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