Measure: Show delta option also in interactive mode (#16379)

* Initial commit to apply delta also for interactive measurement
* Not required special logic to check if possible, it can be easily checked if the property exists
* remember setting so it is not required to turn it always on

src/Mod/Measure/Gui/TaskMeasure.cpp

@@ -32,6 +32,8 @@
 
 #include <App/DocumentObjectGroup.h>
 #include <App/Link.h>
+#include <Mod/Measure/App/MeasureDistance.h>
+#include <App/PropertyStandard.h>
 #include <Gui/MainWindow.h>
 #include <Gui/Application.h>
 #include <Gui/BitmapFactory.h>
@@ -40,9 +42,15 @@
 
 #include <QFormLayout>
 #include <QPushButton>
+#include <QSettings>
 
 using namespace Gui;
 
+namespace
+{
+constexpr auto taskMeasureSettingsGroup = "TaskMeasure";
+constexpr auto taskMeasureShowDeltaSettingsName = "ShowDelta";
+}  // namespace
 
 TaskMeasure::TaskMeasure()
 {
@@ -54,6 +62,15 @@ TaskMeasure::TaskMeasure()
                                               true,
                                               nullptr);
 
+    QSettings settings;
+    settings.beginGroup(QLatin1String(taskMeasureSettingsGroup));
+    delta = settings.value(QLatin1String(taskMeasureShowDeltaSettingsName), true).toBool();
+
+    showDelta = new QCheckBox();
+    showDelta->setChecked(delta);
+    showDeltaLabel = new QLabel(tr("Show Delta:"));
+    connect(showDelta, &QCheckBox::stateChanged, this, &TaskMeasure::showDeltaChanged);
+
     // Create mode dropdown and add all registered measuretypes
     modeSwitch = new QComboBox();
     modeSwitch->addItem(QString::fromLatin1("Auto"));
@@ -82,6 +99,7 @@ TaskMeasure::TaskMeasure()
     formLayout->setFormAlignment(Qt::AlignCenter);
 
     formLayout->addRow(tr("Mode:"), modeSwitch);
+    formLayout->addRow(showDeltaLabel, showDelta);
     formLayout->addRow(tr("Result:"), valueResult);
     layout->addLayout(formLayout);
 
@@ -319,6 +337,15 @@ void TaskMeasure::update()
     valueResult->setText(_mMeasureObject->getResultString());
 
     createViewObject(_mMeasureObject);
+
+    // Must be after createViewObject!
+    assert(_mViewObject);
+    auto* prop = dynamic_cast<App::PropertyBool*>(_mViewObject->getPropertyByName("ShowDelta"));
+    setDeltaPossible(prop != nullptr);
+    if (prop) {
+        prop->setValue(showDelta->isChecked());
+        _mViewObject->update(prop);
+    }
 }
 
 void TaskMeasure::close()
@@ -462,9 +489,27 @@ bool TaskMeasure::eventFilter(QObject* obj, QEvent* event)
     return TaskDialog::eventFilter(obj, event);
 }
 
+void TaskMeasure::setDeltaPossible(bool possible)
+{
+    showDelta->setVisible(possible);
+    showDeltaLabel->setVisible(possible);
+}
+
 void TaskMeasure::onModeChanged(int index)
 {
     explicitMode = (index != 0);
+
+    this->update();
+}
+
+void TaskMeasure::showDeltaChanged(int checkState)
+{
+    delta = checkState == Qt::CheckState::Checked;
+
+    QSettings settings;
+    settings.beginGroup(QLatin1String(taskMeasureSettingsGroup));
+    settings.setValue(QLatin1String(taskMeasureShowDeltaSettingsName), delta);
+
     this->update();
 }
 

src/Mod/Measure/Gui/TaskMeasure.h

@@ -24,6 +24,7 @@
 #include <QString>
 #include <QComboBox>
 #include <QLineEdit>
+#include <QCheckBox>
 
 #include <App/Application.h>
 #include <App/Document.h>
@@ -77,9 +78,12 @@ private:
 
     QLineEdit* valueResult {nullptr};
     QComboBox* modeSwitch {nullptr};
+    QCheckBox* showDelta {nullptr};
+    QLabel* showDeltaLabel {nullptr};
 
     void removeObject();
     void onModeChanged(int index);
+    void showDeltaChanged(int checkState);
     void setModeSilent(App::MeasureType* mode);
     App::MeasureType* getMeasureType();
     void enableAnnotateButton(bool state);
@@ -87,6 +91,7 @@ private:
     Gui::ViewProviderDocumentObject* createViewObject(App::DocumentObject* measureObj);
     void saveObject();
     void ensureGroup(Measure::MeasureBase* measurement);
+    void setDeltaPossible(bool possible);
 
 
     // List of measure types
@@ -94,6 +99,9 @@ private:
 
     // Stores if the mode is explicitly set by the user or implicitly through the selection
     bool explicitMode = false;
+
+    // Stores if delta measures shall be shown
+    bool delta = true;
 };
 
 }  // namespace Gui