From 038d04b3da8238cc71914d5851f2586857b8445d Mon Sep 17 00:00:00 2001
From: Gary Wang <wzc782970009@gmail.com>
Date: Fri, 14 May 2021 00:00:03 +0800
Subject: [PATCH] feat: fit by width

Signed-off-by: Gary Wang <wzc782970009@gmail.com>
---
 app/actionmanager.cpp |  2 ++
 app/actionmanager.h   |  1 +
 app/graphicsview.cpp  | 25 +++++++++++++++++++++++++
 app/graphicsview.h    |  1 +
 app/mainwindow.cpp    |  6 ++++++
 app/mainwindow.h      |  1 +
 6 files changed, 36 insertions(+)

diff --git a/app/actionmanager.cpp b/app/actionmanager.cpp
index f914f77..c876a61 100644
--- a/app/actionmanager.cpp
+++ b/app/actionmanager.cpp
@@ -24,6 +24,7 @@ void ActionManager::setupAction(MainWindow *mainWindow)
     CREATE_NEW_ACTION(mainWindow, actionZoomIn);
     CREATE_NEW_ACTION(mainWindow, actionZoomOut);
     CREATE_NEW_ACTION(mainWindow, actionHorizontalFlip);
+    CREATE_NEW_ACTION(mainWindow, actionFitByWidth);
     CREATE_NEW_ACTION(mainWindow, actionCopyPixmap);
     CREATE_NEW_ACTION(mainWindow, actionCopyFilePath);
     CREATE_NEW_ACTION(mainWindow, actionPaste);
@@ -47,6 +48,7 @@ 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", "Flip &Horizontally", nullptr));
+    actionFitByWidth->setText("Fit by width"); // TODO: what should it called?
     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 cb31694..50e7978 100644
--- a/app/actionmanager.h
+++ b/app/actionmanager.h
@@ -19,6 +19,7 @@ public:
     QAction *actionZoomIn;
     QAction *actionZoomOut;
     QAction *actionHorizontalFlip;
+    QAction *actionFitByWidth;
     QAction *actionCopyPixmap;
     QAction *actionCopyFilePath;
     QAction *actionPaste;
diff --git a/app/graphicsview.cpp b/app/graphicsview.cpp
index b59a196..3bce171 100644
--- a/app/graphicsview.cpp
+++ b/app/graphicsview.cpp
@@ -171,6 +171,31 @@ void GraphicsView::fitInView(const QRectF &rect, Qt::AspectRatioMode aspectRadio
     applyTransformationModeByScaleFactor();
 }
 
+void GraphicsView::fitByOrientation(Qt::Orientation ori, bool scaleDownOnly)
+{
+    resetScale();
+
+    QRectF viewRect = this->viewport()->rect().adjusted(2, 2, -2, -2);
+    QRectF imageRect = transform().mapRect(sceneRect());
+
+    qreal ratio;
+
+    if (ori == Qt::Horizontal) {
+        ratio = viewRect.width() / imageRect.width();
+    } else {
+        ratio = viewRect.height() / imageRect.height();
+    }
+
+    if (scaleDownOnly && ratio > 1) ratio = 1;
+
+    scale(ratio, ratio);
+    centerOn(imageRect.top(), 0);
+    m_enableFitInView = false;
+
+    applyTransformationModeByScaleFactor();
+    emit navigatorViewRequired(!isThingSmallerThanWindowWith(transform()), transform());
+}
+
 void GraphicsView::checkAndDoFitInView(bool markItOnAnyway)
 {
     if (!isThingSmallerThanWindowWith(transform())) {
diff --git a/app/graphicsview.h b/app/graphicsview.h
index ab324de..b741c4f 100644
--- a/app/graphicsview.h
+++ b/app/graphicsview.h
@@ -30,6 +30,7 @@ public:
     void flipView(bool horizontal = true);
     void resetScale();
     void fitInView(const QRectF &rect, Qt::AspectRatioMode aspectRadioMode = Qt::IgnoreAspectRatio);
+    void fitByOrientation(Qt::Orientation ori = Qt::Horizontal, bool scaleDownOnly = false);
 
     void checkAndDoFitInView(bool markItOnAnyway = true);
 
diff --git a/app/mainwindow.cpp b/app/mainwindow.cpp
index bac7f8b..699f2c8 100644
--- a/app/mainwindow.cpp
+++ b/app/mainwindow.cpp
@@ -421,6 +421,7 @@ void MainWindow::contextMenuEvent(QContextMenuEvent *event)
     menu->addSeparator();
 
     menu->addAction(m_am->actionHorizontalFlip);
+    menu->addAction(m_am->actionFitByWidth);
 
     menu->addSeparator();
     menu->addAction(stayOnTopMode);
@@ -561,6 +562,11 @@ void MainWindow::on_actionHorizontalFlip_triggered()
     m_graphicsView->flipView();
 }
 
+void MainWindow::on_actionFitByWidth_triggered()
+{
+    m_graphicsView->fitByOrientation();
+}
+
 void MainWindow::on_actionCopyPixmap_triggered()
 {
     QClipboard *cb = QApplication::clipboard();
diff --git a/app/mainwindow.h b/app/mainwindow.h
index 0eb2a8d..4ab6c65 100644
--- a/app/mainwindow.h
+++ b/app/mainwindow.h
@@ -66,6 +66,7 @@ private slots:
     void on_actionZoomIn_triggered();
     void on_actionZoomOut_triggered();
     void on_actionHorizontalFlip_triggered();
+    void on_actionFitByWidth_triggered();
     void on_actionCopyPixmap_triggered();
     void on_actionCopyFilePath_triggered();
     void on_actionPaste_triggered();