Grey out Apply button when there are no changes

Resolves #1313

What this commit does:
* Whenever the Apply button is pressed, and if the save was successful, then the Apply button is disabled.
* Each subwidget used by EditEntryWidget has now a signal called `widgetUpdated` that is emitted when the widgets' internal content changes. The EditEntryWidget subscribes to that signal to know when to enable the Apply button (by calling `entryUpdated()`).
* There are some views that are not isolated in their own widgets (`m_advancedUi`, for example) so in those cases I invoked `entryUpdated()` directly whenever I detected an update:
  * some updates occur directly in a Qt widget like when editing the text of a QLineItem, so in that case I connected the widget's signals directly to the `entryUpdated()` slot.
  * some updates occur in EditEntryWidget, so in those cases the invocation to `entryUpdated()` is made as soon as the change is detected (for example when the user has confirmed an action in a dialog).

A known problem: there are some situations when the Apply button will get enabled even if there are no changes, this is because the app changes the value of a field by itself so it's considered an update (for example, clicking on the "Reveal" button changes the text shown in a text field).
The solution to this can be a bit complicated: disabling temporarily the `entryUpdated()` whenever the app is going to do an action with such side-effects.
So I preferred to let the Apply button get enabled in those cases.

src/gui/EditWidget.cpp

@@ -117,6 +117,14 @@ bool EditWidget::readOnly() const
     return m_readOnly;
 }
 
+void EditWidget::enableApplyButton(bool enabled)
+{
+    QPushButton* applyButton = m_ui->buttonBox->button(QDialogButtonBox::Apply);
+    if (applyButton) {
+        applyButton->setEnabled(enabled);
+    }
+}
+
 void EditWidget::showMessage(const QString& text, MessageWidget::MessageType type)
 {
     m_ui->messageWidget->setCloseButtonVisible(false);

src/gui/EditWidget.h

@@ -47,6 +47,7 @@ public:
     QLabel* headlineLabel();
     void setReadOnly(bool readOnly);
     bool readOnly() const;
+    void enableApplyButton(bool enabled);
 
 signals:
     void apply();

src/gui/EditWidgetIcons.cpp

@@ -66,6 +66,13 @@ EditWidgetIcons::EditWidgetIcons(QWidget* parent)
     connect(m_ui->deleteButton, SIGNAL(clicked()), SLOT(removeCustomIcon()));
     connect(m_ui->faviconButton, SIGNAL(clicked()), SLOT(downloadFavicon()));
 
+    connect(m_ui->defaultIconsRadio, SIGNAL(toggled(bool)), this, SIGNAL(widgetUpdated()));
+    connect(m_ui->defaultIconsRadio, SIGNAL(toggled(bool)), this, SIGNAL(widgetUpdated()));
+    connect(m_ui->defaultIconsView->selectionModel(), SIGNAL(selectionChanged(const QItemSelection&, const QItemSelection&)),
+            this, SIGNAL(widgetUpdated()));
+    connect(m_ui->customIconsView->selectionModel(), SIGNAL(selectionChanged(const QItemSelection&, const QItemSelection&)),
+            this, SIGNAL(widgetUpdated()));
+
     m_ui->faviconButton->setVisible(false);
 }
 
@@ -268,6 +275,8 @@ void EditWidgetIcons::addCustomIcon(const QImage& icon)
         updateRadioButtonCustomIcons();
         QModelIndex index = m_customIconModel->indexFromUuid(uuid);
         m_ui->customIconsView->setCurrentIndex(index);
+
+        emit widgetUpdated();
     }
 }
 
@@ -347,6 +356,8 @@ void EditWidgetIcons::removeCustomIcon()
             } else {
                 m_ui->defaultIconsView->setCurrentIndex(m_defaultIconModel->index(Group::DefaultIconNumber));
             }
+
+            emit widgetUpdated();
         }
     }
 }

src/gui/EditWidgetIcons.h

@@ -62,6 +62,7 @@ public slots:
 signals:
     void messageEditEntry(QString, MessageWidget::MessageType);
     void messageEditEntryDismiss();
+    void widgetUpdated();
 
 private slots:
     void downloadFavicon();

src/gui/entry/EditEntryWidget.cpp

@@ -95,6 +95,7 @@ EditEntryWidget::EditEntryWidget(QWidget* parent)
 #endif
     setupProperties();
     setupHistory();
+    setupEntryUpdate();
 
     connect(this, SIGNAL(accepted()), SLOT(acceptEntry()));
     connect(this, SIGNAL(rejected()), SLOT(cancel()));
@@ -227,6 +228,59 @@ void EditEntryWidget::setupHistory()
     connect(m_historyUi->deleteAllButton, SIGNAL(clicked()), SLOT(deleteAllHistoryEntries()));
 }
 
+void EditEntryWidget::setupEntryUpdate()
+{
+    // Entry tab
+    connect(m_mainUi->titleEdit, SIGNAL(textChanged(const QString&)), this, SLOT(setUnsavedChanges()));
+    connect(m_mainUi->usernameEdit, SIGNAL(textChanged(const QString&)), this, SLOT(setUnsavedChanges()));
+    connect(m_mainUi->passwordEdit, SIGNAL(textChanged(const QString&)), this, SLOT(setUnsavedChanges()));
+    connect(m_mainUi->passwordRepeatEdit, SIGNAL(textChanged(const QString&)), this, SLOT(setUnsavedChanges()));
+    connect(m_mainUi->urlEdit, SIGNAL(textChanged(const QString&)), this, SLOT(setUnsavedChanges()));
+    connect(m_mainUi->expireCheck, SIGNAL(stateChanged(int)), this, SLOT(setUnsavedChanges()));
+    connect(m_mainUi->notesEnabled, SIGNAL(stateChanged(int)), this, SLOT(setUnsavedChanges()));
+    connect(m_mainUi->expireDatePicker, SIGNAL(dateTimeChanged(const QDateTime&)), this, SLOT(setUnsavedChanges()));
+    connect(m_mainUi->notesEdit, SIGNAL(textChanged()), this, SLOT(setUnsavedChanges()));
+
+    // Advanced tab
+    connect(m_advancedUi->attributesEdit, SIGNAL(textChanged()), this, SLOT(setUnsavedChanges()));
+    connect(m_advancedUi->protectAttributeButton, SIGNAL(stateChanged(int)), this, SLOT(setUnsavedChanges()));
+    connect(m_advancedUi->fgColorCheckBox, SIGNAL(stateChanged(int)), this, SLOT(setUnsavedChanges()));
+    connect(m_advancedUi->bgColorCheckBox, SIGNAL(stateChanged(int)), this, SLOT(setUnsavedChanges()));
+    connect(m_advancedUi->attachmentsWidget, SIGNAL(widgetUpdated()), this, SLOT(setUnsavedChanges()));
+
+    // Icon tab
+    connect(m_iconsWidget, SIGNAL(widgetUpdated()), this, SLOT(setUnsavedChanges()));
+
+    // Auto-Type tab
+    connect(m_autoTypeUi->enableButton, SIGNAL(stateChanged(int)), this, SLOT(setUnsavedChanges()));
+    connect(m_autoTypeUi->customWindowSequenceButton, SIGNAL(stateChanged(int)), this, SLOT(setUnsavedChanges()));
+    connect(m_autoTypeUi->inheritSequenceButton, SIGNAL(toggled(bool)), this, SLOT(setUnsavedChanges()));
+    connect(m_autoTypeUi->customSequenceButton, SIGNAL(toggled(bool)), this, SLOT(setUnsavedChanges()));
+    connect(m_autoTypeUi->windowSequenceEdit, SIGNAL(textChanged(const QString&)), this, SLOT(setUnsavedChanges()));
+    connect(m_autoTypeUi->sequenceEdit, SIGNAL(textChanged(const QString&)), this, SLOT(setUnsavedChanges()));
+    connect(m_autoTypeUi->windowTitleCombo, SIGNAL(currentIndexChanged(int)), this, SLOT(setUnsavedChanges()));
+    connect(m_autoTypeUi->windowTitleCombo, SIGNAL(editTextChanged(const QString&)), this, SLOT(setUnsavedChanges()));
+
+    // Properties and History tabs don't need extra connections
+
+#ifdef WITH_XC_SSHAGENT
+    // SSH Agent tab
+    if (config()->get("SSHAgent", false).toBool()) {
+        connect(m_sshAgentUi->attachmentRadioButton, SIGNAL(toggled(bool)), this, SLOT(setUnsavedChanges()));
+        connect(m_sshAgentUi->externalFileRadioButton, SIGNAL(toggled(bool)), this, SLOT(setUnsavedChanges()));
+        connect(m_sshAgentUi->attachmentComboBox, SIGNAL(currentIndexChanged(int)), this, SLOT(setUnsavedChanges()));
+        connect(m_sshAgentUi->attachmentComboBox, SIGNAL(editTextChanged(const QString&)), this, SLOT(setUnsavedChanges()));
+        connect(m_sshAgentUi->externalFileEdit, SIGNAL(textChanged(const QString&)), this, SLOT(setUnsavedChanges()));
+        connect(m_sshAgentUi->publicKeyEdit, SIGNAL(textChanged()), this, SLOT(setUnsavedChanges()));
+        connect(m_sshAgentUi->addKeyToAgentCheckBox, SIGNAL(stateChanged(int)), this, SLOT(setUnsavedChanges()));
+        connect(m_sshAgentUi->removeKeyFromAgentCheckBox, SIGNAL(stateChanged(int)), this, SLOT(setUnsavedChanges()));
+        connect(m_sshAgentUi->requireUserConfirmationCheckBox, SIGNAL(stateChanged(int)), this, SLOT(setUnsavedChanges()));
+        connect(m_sshAgentUi->lifetimeCheckBox, SIGNAL(stateChanged(int)), this, SLOT(setUnsavedChanges()));
+        connect(m_sshAgentUi->lifetimeSpinBox, SIGNAL(valueChanged(int)), this, SLOT(setUnsavedChanges()));
+    }
+#endif
+}
+
 void EditEntryWidget::emitHistoryEntryActivated(const QModelIndex& index)
 {
     Q_ASSERT(!m_history);
@@ -581,7 +635,6 @@ void EditEntryWidget::loadEntry(Entry* entry, bool create, bool history, const Q
     m_database = database;
     m_create = create;
     m_history = history;
-    m_saved = false;
 
     if (history) {
         setHeadline(QString("%1 > %2").arg(parentName, tr("Entry history")));
@@ -601,6 +654,9 @@ void EditEntryWidget::loadEntry(Entry* entry, bool create, bool history, const Q
 
     setCurrentPage(0);
     setPageHidden(m_historyWidget, m_history || m_entry->historyItems().count() < 1);
+
+    // Force the user to Save/Apply/Discard new entries
+    setUnsavedChanges(m_create);
 }
 
 void EditEntryWidget::setForms(const Entry* entry, bool restore)
@@ -780,7 +836,7 @@ bool EditEntryWidget::commitEntry()
     }
 
     updateEntryData(m_entry);
-    m_saved = true;
+    setUnsavedChanges(false);
 
     if (!m_create) {
         m_entry->endUpdate();
@@ -940,6 +996,8 @@ void EditEntryWidget::insertAttribute()
 
     m_advancedUi->attributesView->setCurrentIndex(index);
     m_advancedUi->attributesView->edit(index);
+
+    setUnsavedChanges(true);
 }
 
 void EditEntryWidget::editCurrentAttribute()
@@ -950,6 +1008,7 @@ void EditEntryWidget::editCurrentAttribute()
 
     if (index.isValid()) {
         m_advancedUi->attributesView->edit(index);
+        setUnsavedChanges(true);
     }
 }
 
@@ -963,6 +1022,7 @@ void EditEntryWidget::removeCurrentAttribute()
         if (MessageBox::question(this, tr("Confirm Remove"), tr("Are you sure you want to remove this attribute?"),
                                  QMessageBox::Yes | QMessageBox::No) == QMessageBox::Yes) {
             m_entryAttributes->remove(m_attributesModel->keyByIndex(index));
+            setUnsavedChanges(true);
         }
     }
 }
@@ -1047,9 +1107,11 @@ void EditEntryWidget::revealCurrentAttribute()
     if (! m_advancedUi->attributesEdit->isEnabled()) {
         QModelIndex index = m_advancedUi->attributesView->currentIndex();
         if (index.isValid()) {
+            bool oldBlockSignals = m_advancedUi->attributesEdit->blockSignals(true);
             QString key = m_attributesModel->keyByIndex(index);
             m_advancedUi->attributesEdit->setPlainText(m_entryAttributes->value(key));
             m_advancedUi->attributesEdit->setEnabled(true);
+            m_advancedUi->attributesEdit->blockSignals(oldBlockSignals);
         }
     }
 }
@@ -1083,6 +1145,7 @@ void EditEntryWidget::insertAutoTypeAssoc()
     m_autoTypeUi->assocView->setCurrentIndex(newIndex);
     loadCurrentAssoc(newIndex);
     m_autoTypeUi->windowTitleCombo->setFocus();
+    setUnsavedChanges(true);
 }
 
 void EditEntryWidget::removeAutoTypeAssoc()
@@ -1091,6 +1154,7 @@ void EditEntryWidget::removeAutoTypeAssoc()
 
     if (currentIndex.isValid()) {
         m_autoTypeAssoc->remove(currentIndex.row());
+        setUnsavedChanges(true);
     }
 }
 
@@ -1153,6 +1217,7 @@ void EditEntryWidget::restoreHistoryEntry()
     QModelIndex index = m_sortModel->mapToSource(m_historyUi->historyView->currentIndex());
     if (index.isValid()) {
         setForms(m_historyModel->entryFromIndex(index), true);
+        setUnsavedChanges(true);
     }
 }
 
@@ -1166,6 +1231,7 @@ void EditEntryWidget::deleteHistoryEntry()
         } else {
             m_historyUi->deleteAllButton->setEnabled(false);
         }
+        setUnsavedChanges(true);
     }
 }
 
@@ -1178,6 +1244,7 @@ void EditEntryWidget::deleteAllHistoryEntries()
     else {
         m_historyUi->deleteAllButton->setEnabled(false);
     }
+    setUnsavedChanges(true);
 }
 
 QMenu* EditEntryWidget::createPresetsMenu()
@@ -1229,5 +1296,12 @@ void EditEntryWidget::pickColor()
     QColor newColor = colorDialog.getColor(oldColor);
     if (newColor.isValid()) {
         setupColorButton(isForeground, newColor);
+        setUnsavedChanges(true);
     }
 }
+
+void EditEntryWidget::setUnsavedChanges(bool hasUnsaved)
+{
+    m_saved = !hasUnsaved;
+    enableApplyButton(hasUnsaved);
+}

src/gui/entry/EditEntryWidget.h

@@ -100,6 +100,7 @@ private slots:
     void useExpiryPreset(QAction* action);
     void toggleHideNotes(bool visible);
     void pickColor();
+    void setUnsavedChanges(bool hasUnsaved = true);
 #ifdef WITH_XC_SSHAGENT
     void updateSSHAgent();
     void updateSSHAgentAttachment();
@@ -122,6 +123,7 @@ private:
 #endif
     void setupProperties();
     void setupHistory();
+    void setupEntryUpdate();
     void setupColorButton(bool foreground, const QColor& color);
 
     bool passwordsEqual();

src/gui/entry/EntryAttachmentsWidget.cpp

@@ -147,6 +147,7 @@ void EntryAttachmentsWidget::insertAttachments()
     if (!insertAttachments(filenames, errorMessage)) {
         errorOccurred(errorMessage);
     }
+    emit widgetUpdated();
 }
 
 void EntryAttachmentsWidget::removeSelectedAttachments()
@@ -170,6 +171,7 @@ void EntryAttachmentsWidget::removeSelectedAttachments()
             keys.append(m_attachmentsModel->keyByIndex(index));
         }
         m_entryAttachments->remove(keys);
+        emit widgetUpdated();
     }
 }
 

src/gui/entry/EntryAttachmentsWidget.h

@@ -39,6 +39,7 @@ signals:
     void errorOccurred(const QString& error);
     void readOnlyChanged(bool readOnly);
     void buttonsVisibleChanged(bool isButtonsVisible);
+    void widgetUpdated();
 
 private slots:
     void insertAttachments();