From 6a9e5e80d054db6179e077f8ebe5d2a91368c8a0 Mon Sep 17 00:00:00 2001
From: Gary Wang <wzc782970009@gmail.com>
Date: Fri, 19 Mar 2021 23:11:06 +0800
Subject: [PATCH] feat: basic image flip support

---
 app/actionmanager.cpp |  2 ++
 app/actionmanager.h   |  1 +
 app/graphicsview.cpp  | 11 +++++++++++
 app/graphicsview.h    |  1 +
 app/mainwindow.cpp    |  9 +++++++++
 app/mainwindow.h      |  1 +
 6 files changed, 25 insertions(+)

diff --git a/app/actionmanager.cpp b/app/actionmanager.cpp
index c0d2546..c87523d 100644
--- a/app/actionmanager.cpp
+++ b/app/actionmanager.cpp
@@ -23,6 +23,7 @@ void ActionManager::setupAction(MainWindow *mainWindow)
 {
     CREATE_NEW_ACTION(mainWindow, actionZoomIn);
     CREATE_NEW_ACTION(mainWindow, actionZoomOut);
+    CREATE_NEW_ACTION(mainWindow, actionHorizontalFlip);
     CREATE_NEW_ACTION(mainWindow, actionCopyPixmap);
     CREATE_NEW_ACTION(mainWindow, actionCopyFilePath);
     CREATE_NEW_ACTION(mainWindow, actionPaste);
@@ -45,6 +46,7 @@ void ActionManager::retranslateUi(MainWindow *mainWindow)
 
     actionZoomIn->setText(QCoreApplication::translate("MainWindow", "Zoom in", nullptr));
     actionZoomOut->setText(QCoreApplication::translate("MainWindow", "Zoom out", nullptr));
+    actionHorizontalFlip->setText(QCoreApplication::translate("MainWindow", "Horizontal flip", nullptr));
     actionCopyPixmap->setText(QCoreApplication::translate("MainWindow", "Copy P&ixmap", nullptr));
     actionCopyFilePath->setText(QCoreApplication::translate("MainWindow", "Copy &File Path", nullptr));
     actionPaste->setText(QCoreApplication::translate("MainWindow", "&Paste", nullptr));
diff --git a/app/actionmanager.h b/app/actionmanager.h
index e8fe8e7..cb31694 100644
--- a/app/actionmanager.h
+++ b/app/actionmanager.h
@@ -18,6 +18,7 @@ public:
 public:
     QAction *actionZoomIn;
     QAction *actionZoomOut;
+    QAction *actionHorizontalFlip;
     QAction *actionCopyPixmap;
     QAction *actionCopyFilePath;
     QAction *actionPaste;
diff --git a/app/graphicsview.cpp b/app/graphicsview.cpp
index ef363a4..d2a3346 100644
--- a/app/graphicsview.cpp
+++ b/app/graphicsview.cpp
@@ -134,6 +134,17 @@ void GraphicsView::zoomView(qreal scaleFactor)
     emit navigatorViewRequired(!isThingSmallerThanWindowWith(transform()), m_rotateAngle);
 }
 
+void GraphicsView::flipView(bool horizontal)
+{
+    if (horizontal) {
+        scale(-1, 1);
+    } else {
+        scale(1, -1);
+    }
+    // I guess we don't need to check if we need to trigger navigator view here
+    // since fliping doesn't affact the image rectangle size.
+}
+
 void GraphicsView::resetScale()
 {
     resetWithScaleAndRotate(1, m_rotateAngle);
diff --git a/app/graphicsview.h b/app/graphicsview.h
index 79deb2f..708245e 100644
--- a/app/graphicsview.h
+++ b/app/graphicsview.h
@@ -26,6 +26,7 @@ public:
 
     void resetTransform();
     void zoomView(qreal scaleFactor);
+    void flipView(bool horizontal = true);
     void resetScale();
     void rotateView(qreal rotateAngel);
     void fitInView(const QRectF &rect, Qt::AspectRatioMode aspectRadioMode = Qt::IgnoreAspectRatio);
diff --git a/app/mainwindow.cpp b/app/mainwindow.cpp
index 242adf3..ed413a8 100644
--- a/app/mainwindow.cpp
+++ b/app/mainwindow.cpp
@@ -420,6 +420,10 @@ void MainWindow::contextMenuEvent(QContextMenuEvent *event)
         menu->addAction(paste);
     }
 
+    menu->addSeparator();
+
+    menu->addAction(m_am->actionHorizontalFlip);
+
     menu->addSeparator();
     menu->addAction(stayOnTopMode);
     menu->addAction(protectedMode);
@@ -554,6 +558,11 @@ void MainWindow::on_actionZoomOut_triggered()
     m_graphicsView->zoomView(0.8);
 }
 
+void MainWindow::on_actionHorizontalFlip_triggered()
+{
+    m_graphicsView->flipView();
+}
+
 void MainWindow::on_actionCopyPixmap_triggered()
 {
     QClipboard *cb = QApplication::clipboard();
diff --git a/app/mainwindow.h b/app/mainwindow.h
index d12c6ed..0eb2a8d 100644
--- a/app/mainwindow.h
+++ b/app/mainwindow.h
@@ -65,6 +65,7 @@ protected:
 private slots:
     void on_actionZoomIn_triggered();
     void on_actionZoomOut_triggered();
+    void on_actionHorizontalFlip_triggered();
     void on_actionCopyPixmap_triggered();
     void on_actionCopyFilePath_triggered();
     void on_actionPaste_triggered();