添加‘撤回/重做’功能模块，并完成了对‘添加图形’和‘删除图形’的指令实现

CMakeLists.txt

@@ -39,6 +39,7 @@ set(H_HEADER_FILES
     include/drawingPanel.h
     include/designerScene.h
     include/designerView.h
+    include/operationCommand.h
 
     include/util/baseSelector.h
     include/util/creatingSelector.h
@@ -57,6 +58,7 @@ set(CPP_SOURCE_FILES
     source/drawingPanel.cpp
     source/designerScene.cpp
     source/designerView.cpp
+    source/operationCommand.cpp
 
     source/util/baseSelector.cpp
     source/util/creatingSelector.cpp

include/designerScene.h

@@ -16,12 +16,17 @@ public:
     QGraphicsView *getView() { return m_pView; }
     void callParentEvent(QGraphicsSceneMouseEvent*);
 
+signals:
+    void signalAddItem(QGraphicsItem*);
+
 protected:
     void drawBackground(QPainter*, const QRectF&) override;
     void mousePressEvent(QGraphicsSceneMouseEvent*) override;
     void mouseMoveEvent(QGraphicsSceneMouseEvent*) override;
     void mouseReleaseEvent(QGraphicsSceneMouseEvent*) override;
     void mouseDoubleClickEvent(QGraphicsSceneMouseEvent*) override;
+    void keyPressEvent(QKeyEvent*) override;
+    void keyReleaseEvent(QKeyEvent*) override;
 
 private:
     bool            m_bGridVisible;

include/drawingPanel.h

@@ -19,6 +19,9 @@ public:
     DrawingPanel(QWidget *parent = nullptr);
     ~DrawingPanel();
 
+    QGraphicsScene* getQGraphicsScene();
+    DesignerScene* getDesignerScene();
+
 public slots:
     void onSignal_addGraphicsItem(GraphicsItemType&);
 

include/mainwindow.h

@@ -13,8 +13,11 @@ QT_BEGIN_NAMESPACE
 namespace Ui { class CMainWindow; }
 QT_END_NAMESPACE
 
+class QGraphicsItem;
+class QUndoStack;
 class DrawingPanel;
 class GraphicElementsPanel;
+class DesignerScene;
 
 class CMainWindow : public QMainWindow
 {
@@ -27,11 +30,21 @@ public:
 protected:
 	virtual void closeEvent(QCloseEvent* event) override;
 
+private:
+    void initializeDockUi();
+    void initializeAction();
+
+private slots:
+    void onSignal_addItem(QGraphicsItem*);
+    void onSignal_deleteItem();
+
 private:
 	QAction* SavePerspectiveAction = nullptr;
 	QWidgetAction* PerspectiveListAction = nullptr;
 	QComboBox* PerspectiveComboBox = nullptr;
 
+    QUndoStack* m_pUndoStack;
+
     Ui::CMainWindow *ui;
 
     ads::CDockManager* DockManager;
@@ -40,10 +53,5 @@ private:
 
     DrawingPanel*          m_pDrawingPanel;
     GraphicElementsPanel*  m_pGraphicElementsPanel;
-
-    void createPerspectiveUi();
-
-private slots:
-	void savePerspective();
 };
 #endif // MAINWINDOW_H

include/operationCommand.h

@@ -0,0 +1,46 @@
+/**
+     *\file operationCommand.h
+     *
+     *\brief 用来实现“撤销/重做”的操作指令,继承自QUndoCommand
+     *
+     *\author dsc
+     */
+
+#ifndef OPERATIONCOMMAND_H
+#define OPERATIONCOMMAND_H
+
+#include <QUndoCommand>
+#include <QGraphicsScene>
+
+class AddItemCommand : public QUndoCommand
+{
+public:
+    explicit AddItemCommand(QGraphicsItem* item, QGraphicsScene* graphicsScene, QUndoCommand* parent = 0);
+    ~AddItemCommand();
+
+public:
+    void undo() override;
+    void redo() override;
+
+private:
+    QGraphicsItem*    m_pItem;
+    QPointF           m_itemPos;
+    QGraphicsScene*   m_pGraphicsScene;
+};
+
+class DeleteItemCommand : public QUndoCommand
+{
+public:
+    explicit DeleteItemCommand(QGraphicsScene* graphicsScene, QUndoCommand* parent = 0);
+    ~DeleteItemCommand();
+
+public:
+    void undo() override;
+    void redo() override;
+
+private:
+    QList<QGraphicsItem*>  m_listItem;
+    QGraphicsScene*        m_pGraphicsScene;
+};
+
+#endif

source/designerScene.cpp

@@ -83,6 +83,16 @@ void DesignerScene::mouseDoubleClickEvent(QGraphicsSceneMouseEvent* mouseEvent)
         QGraphicsScene::mouseReleaseEvent(mouseEvent);
 }
 
+void DesignerScene::keyPressEvent(QKeyEvent* event)
+{
+    QGraphicsScene::keyPressEvent(event);
+}
+
+void DesignerScene::keyReleaseEvent(QKeyEvent* event)
+{
+    QGraphicsScene::keyReleaseEvent(event);
+}
+
 void DesignerScene::setGridVisible(bool bVisible)
 {
     m_bGridVisible = bVisible;

source/drawingPanel.cpp

@@ -19,8 +19,6 @@ DrawingPanel::DrawingPanel(QWidget *parent)
     m_pGraphicsView->setScene(m_pGraphicsScene);
     m_pGraphicsScene->setView(m_pGraphicsView);
     ui->mainLayout->addWidget(m_pGraphicsView);
-
-
 }
 
 DrawingPanel::~DrawingPanel()
@@ -28,6 +26,16 @@ DrawingPanel::~DrawingPanel()
     delete ui;
 }
 
+QGraphicsScene* DrawingPanel::getQGraphicsScene()
+{
+    return m_pGraphicsView->scene();
+}
+
+DesignerScene* DrawingPanel::getDesignerScene()
+{
+    return m_pGraphicsScene;
+}
+
 void DrawingPanel::onSignal_addGraphicsItem(GraphicsItemType& itemType)
 {
     if(SelectorManager::getInstance())

source/mainwindow.cpp

@@ -3,20 +3,11 @@
 #include "ui_mainwindow.h"
 
 #include <QWidgetAction>
-#include <QLabel>
-#include <QCalendarWidget>
-#include <QTreeView>
-#include <QFileSystemModel>
 #include <QTableWidget>
-#include <QHBoxLayout>
-#include <QRadioButton>
-#include <QPushButton>
-#include <QInputDialog>
-#include <QFileDialog>
 #include <QSettings>
-#include <QMessageBox>
+#include <QUndoStack>
-#include <QPlainTextEdit>
+#include <QGraphicsScene>
-#include <QToolBar>
+#include <QGraphicsItem>
 
 #include "DockAreaWidget.h"
 #include "DockAreaTitleBar.h"
@@ -25,7 +16,9 @@
 #include "DockComponentsFactory.h"
 
 #include "drawingPanel.h"
+#include "designerScene.h"
 #include "graphicElementsPanel.h"
+#include "operationCommand.h"
 
 using namespace ads;
 
@@ -35,6 +28,30 @@ CMainWindow::CMainWindow(QWidget *parent)
     , ui(new Ui::CMainWindow)
 {
     ui->setupUi(this);
+    m_pUndoStack = nullptr;
+
+    initializeDockUi();
+    initializeAction();
+
+    connect(m_pGraphicElementsPanel,SIGNAL(addGraphicsItem(GraphicsItemType&)),m_pDrawingPanel,SLOT(onSignal_addGraphicsItem(GraphicsItemType&)));
+}
+
+CMainWindow::~CMainWindow()
+{
+    delete ui;
+}
+
+
+void CMainWindow::closeEvent(QCloseEvent* event)
+{
+    // Delete dock manager here to delete all floating widgets. This ensures
+    // that all top level windows of the dock manager are properly closed
+    DockManager->deleteLater();
+	QMainWindow::closeEvent(event);
+}
+
+void CMainWindow::initializeDockUi()
+{
     CDockManager::setConfigFlag(CDockManager::OpaqueSplitterResize, true);
     CDockManager::setConfigFlag(CDockManager::XmlCompressionEnabled, false);
     CDockManager::setConfigFlag(CDockManager::FocusHighlighting, true);
@@ -42,6 +59,7 @@ CMainWindow::CMainWindow(QWidget *parent)
 
     // Set central widget
     m_pDrawingPanel = new DrawingPanel();
+    connect(m_pDrawingPanel->getDesignerScene(), SIGNAL(signalAddItem(QGraphicsItem*)), this, SLOT(onSignal_addItem(QGraphicsItem*)));
     CDockWidget* CentralDockWidget = new CDockWidget("CentralWidget");
     CentralDockWidget->setWidget(m_pDrawingPanel);
     auto* CentralDockArea = DockManager->setCentralWidget(CentralDockWidget);
@@ -54,10 +72,9 @@ CMainWindow::CMainWindow(QWidget *parent)
     GrapicElementsDockWidget->setMinimumSizeHintMode(CDockWidget::MinimumSizeHintFromDockWidget);
     GrapicElementsDockWidget->resize(400, 150);
     GrapicElementsDockWidget->setMinimumSize(200,150);
-    auto TableArea = DockManager->addDockWidget(DockWidgetArea::LeftDockWidgetArea, GrapicElementsDockWidget);
+    DockManager->addDockWidget(DockWidgetArea::LeftDockWidgetArea, GrapicElementsDockWidget);
     ui->menuView->addAction(GrapicElementsDockWidget->toggleViewAction());
 
-
     QTableWidget* propertiesTable = new QTableWidget();
     propertiesTable->setColumnCount(3);
     propertiesTable->setRowCount(10);
@@ -68,57 +85,41 @@ CMainWindow::CMainWindow(QWidget *parent)
     PropertiesDockWidget->setMinimumSize(200,150);
     DockManager->addDockWidget(DockWidgetArea::RightDockWidgetArea, PropertiesDockWidget, CentralDockArea);
     ui->menuView->addAction(PropertiesDockWidget->toggleViewAction());
-
-    //createPerspectiveUi();
-    connect(m_pGraphicElementsPanel,SIGNAL(addGraphicsItem(GraphicsItemType&)),m_pDrawingPanel,SLOT(onSignal_addGraphicsItem(GraphicsItemType&)));
 }
 
-CMainWindow::~CMainWindow()
+void CMainWindow::initializeAction()
 {
-    delete ui;
+    //撤销、重做
+    m_pUndoStack = new QUndoStack(this);
+    ui->actionUndo = m_pUndoStack->createUndoAction(this, tr("撤销"));
+    ui->actionUndo->setIcon(QIcon::fromTheme(QString::fromUtf8("edit-undo")));
+    ui->actionUndo->setShortcuts(QKeySequence::Undo);
+    ui->actionRedo = m_pUndoStack->createRedoAction(this, tr("重做"));
+    ui->actionRedo->setIcon(QIcon::fromTheme(QString::fromUtf8("edit-redo")));
+    ui->actionRedo->setShortcuts(QKeySequence::Redo);
+    ui->toolBar->addAction(ui->actionUndo);
+    ui->toolBar->addAction(ui->actionRedo);
+    ui->actionUndo->setEnabled(m_pUndoStack->canUndo());
+    ui->actionRedo->setEnabled(m_pUndoStack->canRedo());
+
+    ui->actionDelete->setShortcut(QKeySequence::Delete);
+
+    connect(ui->actionDelete, SIGNAL(triggered()), this, SLOT(onSignal_deleteItem()));
 }
 
-
+void CMainWindow::onSignal_addItem(QGraphicsItem* item)
-void CMainWindow::createPerspectiveUi()
 {
-	SavePerspectiveAction = new QAction("Create Perspective", this);
+    QUndoCommand* addItemCommand = new AddItemCommand(item, item->scene());
-	connect(SavePerspectiveAction, SIGNAL(triggered()), SLOT(savePerspective()));
+    m_pUndoStack->push(addItemCommand);
-	PerspectiveListAction = new QWidgetAction(this);
-	PerspectiveComboBox = new QComboBox(this);
-	PerspectiveComboBox->setSizeAdjustPolicy(QComboBox::AdjustToContents);
-	PerspectiveComboBox->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);
-	connect(PerspectiveComboBox, SIGNAL(currentTextChanged(const QString&)),
-		DockManager, SLOT(openPerspective(const QString&)));
-	PerspectiveListAction->setDefaultWidget(PerspectiveComboBox);
-	ui->toolBar->addSeparator();
-	ui->toolBar->addAction(PerspectiveListAction);
-	ui->toolBar->addAction(SavePerspectiveAction);
 }
 
-
+void CMainWindow::onSignal_deleteItem()
-void CMainWindow::savePerspective()
-{
-	QString PerspectiveName = QInputDialog::getText(this, "Save Perspective", "Enter unique name:");
-	if (PerspectiveName.isEmpty())
 {
+    QGraphicsScene* scene = m_pDrawingPanel->getQGraphicsScene();
+    if (scene && scene->selectedItems().isEmpty())
         return;
+
+    QUndoCommand* deleteItemCommand = new DeleteItemCommand(scene);
+    m_pUndoStack->push(deleteItemCommand); //push时会自动调用一次command的redo函数
 }
 
-	DockManager->addPerspective(PerspectiveName);
-	QSignalBlocker Blocker(PerspectiveComboBox);
-	PerspectiveComboBox->clear();
-	PerspectiveComboBox->addItems(DockManager->perspectiveNames());
-	PerspectiveComboBox->setCurrentText(PerspectiveName);
-}
-
-
-//============================================================================
-void CMainWindow::closeEvent(QCloseEvent* event)
-{
-    // Delete dock manager here to delete all floating widgets. This ensures
-    // that all top level windows of the dock manager are properly closed
-    DockManager->deleteLater();
-	QMainWindow::closeEvent(event);
-}
-
-

source/operationCommand.cpp

@@ -0,0 +1,64 @@
+#include "operationCommand.h"
+#include <QGraphicsItem>
+
+AddItemCommand::AddItemCommand(QGraphicsItem* item, QGraphicsScene* scene, QUndoCommand* parent)
+    : QUndoCommand(parent)
+{
+    m_pItem = item;
+    m_itemPos = item->pos();
+    m_pGraphicsScene = scene;
+}
+AddItemCommand::~AddItemCommand()
+{
+}
+void AddItemCommand::undo()
+{
+    m_pGraphicsScene->removeItem(m_pItem);
+    m_pGraphicsScene->update();
+}
+void AddItemCommand::redo()
+{
+    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
+        return;
+
+    m_pGraphicsScene->addItem(m_pItem);
+    m_pItem->setPos(m_itemPos);
+    m_pGraphicsScene->update();
+}
+
+DeleteItemCommand::DeleteItemCommand(QGraphicsScene* scene, QUndoCommand* parent)
+    : QUndoCommand(parent)
+{
+    m_pGraphicsScene = scene;
+    m_listItem = scene->selectedItems();
+}
+DeleteItemCommand::~DeleteItemCommand()
+{
+}
+void DeleteItemCommand::undo()
+{
+    foreach(QGraphicsItem* item, m_listItem)
+    {
+        QGraphicsItemGroup* group = dynamic_cast<QGraphicsItemGroup*>(item->parentItem());
+        if(!group)
+        {
+            m_pGraphicsScene->addItem(item);
+        }
+    }
+
+    m_pGraphicsScene->update();
+}
+void DeleteItemCommand::redo()
+{
+    foreach(QGraphicsItem* item, m_listItem)
+    {
+        QGraphicsItemGroup* group = dynamic_cast<QGraphicsItemGroup*>(item->parentItem());
+        if(!group)
+        {
+            m_pGraphicsScene->removeItem(item); //remove即可，不要delete，因为会影响撤回（undo）操作
+        }
+    }
+
+    m_pGraphicsScene->update();
+}
+

source/util/creatingSelector.cpp

@@ -80,6 +80,7 @@ void CreatingSelector::mouseReleaseEvent(QGraphicsSceneMouseEvent* event, Design
     else if (m_pCreatingItem && ms_ptMouseLast != ms_ptMouseDown)
     {
         m_pCreatingItem->updateCoordinate();
+        emit scene->signalAddItem(m_pCreatingItem);
     }
 
     ms_nDragHandle = H_none;

ui/mainwindow.ui

@@ -7,7 +7,7 @@
     <x>0</x>
     <y>0</y>
     <width>1284</width>
-    <height>757</height>
+    <height>756</height>
    </rect>
   </property>
   <property name="windowTitle">
@@ -60,8 +60,6 @@
    <addaction name="actionZoomFit"/>
    <addaction name="actionGrid"/>
    <addaction name="separator"/>
-   <addaction name="actionUndo"/>
-   <addaction name="actionRedo"/>
   </widget>
   <action name="actionNew">
    <property name="icon">
@@ -224,9 +222,6 @@
    <property name="toolTip">
     <string>撤销</string>
    </property>
-   <property name="menuRole">
-    <enum>QAction::MenuRole::NoRole</enum>
-   </property>
   </action>
   <action name="actionRedo">
    <property name="icon">