From 92ce87e599aa969494c3d9a34639152f658de7df Mon Sep 17 00:00:00 2001
From: Filip Leonarski <filip.leonarski@psi.ch>
Date: Mon, 8 Dec 2025 10:58:01 +0100
Subject: [PATCH] jfjoch_viewer: Set foreground with holding F

---
 viewer/JFJochViewerWindow.cpp       | 24 ++++++++++++++++++++++++
 viewer/JFJochViewerWindow.h         |  3 +++
 viewer/image_viewer/JFJochImage.cpp |  9 ++++++++-
 viewer/image_viewer/JFJochImage.h   |  4 ++++
 4 files changed, 39 insertions(+), 1 deletion(-)

diff --git a/viewer/JFJochViewerWindow.cpp b/viewer/JFJochViewerWindow.cpp
index 97c0c687..89e23b97 100644
--- a/viewer/JFJochViewerWindow.cpp
+++ b/viewer/JFJochViewerWindow.cpp
@@ -6,6 +6,7 @@
 #include <QSplitter>
 #include <QThread>
 #include <QDockWidget>
+#include <QKeyEvent>
 
 #include "JFJochImageReadingWorker.h"
 #include "image_viewer/JFJochDiffractionImage.h"
@@ -28,6 +29,8 @@ JFJochViewerWindow::JFJochViewerWindow(QWidget *parent, bool dbus, const QString
     menuBar = new JFJochViewerMenu(this);
     setMenuBar(menuBar);
 
+    setFocusPolicy(Qt::StrongFocus);
+
     auto toolBarImage = new JFJochViewerToolbarImage(this);
     addToolBar(Qt::TopToolBarArea, toolBarImage);
     addToolBarBreak(Qt::TopToolBarArea);
@@ -315,6 +318,9 @@ JFJochViewerWindow::JFJochViewerWindow(QWidget *parent, bool dbus, const QString
     connect(menuBar, &JFJochViewerMenu::openDatasetInfo, this, &JFJochViewerWindow::NewDatasetInfo);
     NewDatasetInfo();
 
+    connect(this, &JFJochViewerWindow::adjustForegroundButton,
+            viewer, &JFJochDiffractionImage::adjustForeground);
+
     if (!file.isEmpty())
         LoadFile(file, 0, 1);
 }
@@ -360,3 +366,21 @@ void JFJochViewerWindow::NewDatasetInfo() {
     connect(info, &JFJochViewerDatasetInfo::writeStatusBar,
             statusbar, &JFJochViewerStatusBar::display);
 }
+
+void JFJochViewerWindow::keyPressEvent(QKeyEvent *event) {
+        if (event->key() == Qt::Key_F) {
+                emit adjustForegroundButton(true);
+                event->accept();
+                return;
+        }
+        QMainWindow::keyPressEvent(event);
+}
+
+void JFJochViewerWindow::keyReleaseEvent(QKeyEvent *event) {
+        if (event->key() == Qt::Key_F) {
+                emit adjustForegroundButton(false);
+                event->accept();
+                return;
+        }
+        QMainWindow::keyReleaseEvent(event);
+}
diff --git a/viewer/JFJochViewerWindow.h b/viewer/JFJochViewerWindow.h
index 843b891b..31454ca7 100644
--- a/viewer/JFJochViewerWindow.h
+++ b/viewer/JFJochViewerWindow.h
@@ -32,6 +32,8 @@ private:
 
     QThread *reading_thread;
 
+    void keyPressEvent(QKeyEvent *event) override;
+    void keyReleaseEvent(QKeyEvent *event) override;
 public slots:
     void LoadFile(const QString &filename, qint64 image_number, qint64 summation);
     void LoadImage(qint64 image_number, qint64 summation);
@@ -40,6 +42,7 @@ public slots:
 signals:
     void LoadFileRequest(const QString &filename, qint64 image_number, qint64 summation);
     void LoadImageRequest(int64_t image_number, int64_t summation);
+    void adjustForegroundButton(bool input);
 };
 
 
diff --git a/viewer/image_viewer/JFJochImage.cpp b/viewer/image_viewer/JFJochImage.cpp
index a69db633..2c9f1246 100644
--- a/viewer/image_viewer/JFJochImage.cpp
+++ b/viewer/image_viewer/JFJochImage.cpp
@@ -76,7 +76,10 @@ void JFJochImage::wheelEvent(QWheelEvent *event) {
     // Get the position of the mouse in scene coordinates
     QPointF targetScenePos = mapToScene(event->position().toPoint());
 
-    if (event->modifiers() == Qt::ShiftModifier) {
+    const bool adjustForeground =
+        (event->modifiers() == Qt::ShiftModifier) || m_adjustForegroundWithWheel;
+
+    if (adjustForeground) {
         float new_foreground = foreground + event->angleDelta().y() / 120.0f;
         if (new_foreground < 1)
             new_foreground = 1.0;
@@ -821,3 +824,7 @@ void JFJochImage::fitToViewShorterSideOnce() {
     initial_fit_done_ = true;
     last_fit_viewport_ = vp;
 }
+
+void JFJochImage::adjustForeground(bool input) {
+    m_adjustForegroundWithWheel = input;
+}
diff --git a/viewer/image_viewer/JFJochImage.h b/viewer/image_viewer/JFJochImage.h
index a6c97d1f..8e3bd522 100644
--- a/viewer/image_viewer/JFJochImage.h
+++ b/viewer/image_viewer/JFJochImage.h
@@ -13,6 +13,8 @@
 class JFJochImage : public QGraphicsView {
     Q_OBJECT
 
+    bool m_adjustForegroundWithWheel = false;
+
     void DrawROI();
     virtual void addCustomOverlay();
     void updateROI();
@@ -101,6 +103,8 @@ public slots:
 
     void centerOnSpot(QPointF point);
     void fitToView();
+
+    void adjustForeground(bool input);
 public:
     explicit JFJochImage(QWidget *parent = nullptr);
 };