Only save settings that has been changed

src/settings/settingspage.cpp

@@ -19,8 +19,119 @@
  */
 
 #include <QWidget>
+#include <QCheckBox>
+#include <QComboBox>
+#include <QSpinBox>
+#include <QRadioButton>
+#include <QSlider>
+#include <QLineEdit>
+#include <QShowEvent>
+
+#include "core/logging.h"
 
 #include "settingsdialog.h"
 #include "settingspage.h"
 
-SettingsPage::SettingsPage(SettingsDialog *dialog) : QWidget(dialog), dialog_(dialog) { }
+SettingsPage::SettingsPage(SettingsDialog *dialog) : QWidget(dialog), dialog_(dialog), ui_widget_(nullptr), changed_(false) {}
+
+void SettingsPage::showEvent(QShowEvent *e) {
+
+  changed_ = false;
+
+  QWidget::showEvent(e);
+
+}
+
+void SettingsPage::Init(QWidget *ui_widget) {
+
+  if (!ui_widget) return;
+
+  ui_widget_ = ui_widget;
+  changed_ = false;
+
+  checkboxes_.clear();
+  radiobuttons_.clear();
+  comboboxes_.clear();
+  spinboxes_.clear();
+  sliders_.clear();
+  lineedits_.clear();
+
+  QList<QWidget*> list = ui_widget_->findChildren<QWidget*>(QString(), Qt::FindChildrenRecursively);
+  for (QWidget *w : list) {
+    if (QCheckBox *checkbox = qobject_cast<QCheckBox*>(w)) {
+      checkboxes_ << qMakePair(checkbox, checkbox->checkState());
+    }
+    else if (QRadioButton *radiobutton = qobject_cast<QRadioButton*>(w)) {
+      radiobuttons_ << qMakePair(radiobutton, radiobutton->isChecked());
+    }
+    else if (QComboBox *combobox = qobject_cast<QComboBox*>(w)) {
+      comboboxes_ << qMakePair(combobox, combobox->currentText());
+    }
+    else if (QSpinBox *spinbox = qobject_cast<QSpinBox*>(w)) {
+      spinboxes_ << qMakePair(spinbox, spinbox->value());
+    }
+    else if (QLineEdit *lineedit = qobject_cast<QLineEdit*>(w)) {
+      lineedits_ << qMakePair(lineedit, lineedit->text());
+    }
+    else if (QSlider *slider = qobject_cast<QSlider*>(w)) {
+      sliders_ << qMakePair(slider, slider->value());
+    }
+  }
+
+}
+
+void SettingsPage::Accept() {
+  Apply();
+}
+
+void SettingsPage::Reject() {
+  Cancel();
+  changed_ = false;
+}
+
+void SettingsPage::Apply() {
+
+  if (!ui_widget_) {
+    qLog(Error) << windowTitle() << "is not initialized!";
+    changed_ = true;
+  }
+
+  for (QPair<QCheckBox*, Qt::CheckState> &checkbox : checkboxes_) {
+    if (checkbox.first->checkState() == checkbox.second) continue;
+    changed_ = true;
+    qLog(Info) << checkbox.first->objectName() << "is changed for" << windowTitle() << "settings.";
+  }
+  for (QPair<QRadioButton*, bool> &radiobutton : radiobuttons_) {
+    if (radiobutton.first->isChecked() == radiobutton.second) continue;
+    changed_ = true;
+    qLog(Info) << radiobutton.first->objectName() << "is changed for" << windowTitle() << "settings.";
+  }
+  for (QPair<QComboBox*, QString> &combobox : comboboxes_) {
+    if (combobox.first->currentText() == combobox.second) continue;
+    changed_ = true;
+    qLog(Info) << combobox.first->objectName() << "is changed for" << windowTitle() << "settings.";
+  }
+  for (QPair<QSpinBox*, int> &spinbox : spinboxes_) {
+    if (spinbox.first->value() == spinbox.second) continue;
+    changed_ = true;
+    qLog(Info) << spinbox.first->objectName() << "is changed for" << windowTitle() << "settings.";
+  }
+  for (QPair<QLineEdit*, QString> &lineedit : lineedits_) {
+    if (lineedit.first->text() == lineedit.second) continue;
+    changed_ = true;
+    if (lineedit.first->objectName().isEmpty()) continue;
+    qLog(Info) << lineedit.first->objectName() << "is changed for" << windowTitle() << "settings.";
+  }
+  for (QPair<QSlider*, int> &slider : sliders_) {
+    if (slider.first->value() == slider.second) continue;
+    changed_ = true;
+    qLog(Info) << slider.first->objectName() << "is changed for" << windowTitle() << "settings.";
+  }
+
+  if (changed_) {
+    qLog(Info) << "Saving settings for" << windowTitle();
+    Save();
+    Init(ui_widget_);
+  }
+
+}