Printing support #1525: print images in Editor Dialog and menu in hex

Added support for printing images in the Editor Dialog. A new action added
that can be activated through the context menu or shortcut for printing.

The same approach is applied to the hex editor, which also lacked a
context menu. Consequently the specific shortcut can be deleted.

src/EditDialog.cpp

@@ -18,6 +18,7 @@
 #include <QMessageBox>
 #include <QPrinter>
 #include <QPrintPreviewDialog>
+#include <QPainter>
 
 EditDialog::EditDialog(QWidget* parent)
     : QDialog(parent),
@@ -50,12 +51,14 @@ EditDialog::EditDialog(QWidget* parent)
     connect(sciEdit, SIGNAL(textChanged()), this, SLOT(updateApplyButton()));
     connect(sciEdit, SIGNAL(textChanged()), this, SLOT(editTextChanged()));
 
-    // Create shortcuts for the widgets that doesn't have its own printing mechanism.
-    QShortcut* shortcutPrintHex = new QShortcut(QKeySequence::Print, hexEdit, nullptr, nullptr, Qt::WidgetShortcut);
-    connect(shortcutPrintHex, &QShortcut::activated, this, &EditDialog::openPrintDialog);
+    // Create shortcuts for the widgets that doesn't have its own print action or printing mechanism.
     QShortcut* shortcutPrintText = new QShortcut(QKeySequence::Print, ui->editorText, nullptr, nullptr, Qt::WidgetShortcut);
     connect(shortcutPrintText, &QShortcut::activated, this, &EditDialog::openPrintDialog);
 
+    // Add actions to editors that have a context menu based on actions. This also activates the shortcuts.
+    ui->editorImage->addAction(ui->actionPrintImage);
+    ui->editorBinary->addAction(ui->actionPrint);
+
     mustIndentAndCompact = Settings::getValue("databrowser", "indent_compact").toBool();
     ui->buttonIndent->setChecked(mustIndentAndCompact);
 
@@ -359,6 +362,8 @@ void EditDialog::importData()
 
 void EditDialog::exportData()
 {
+    openPrintImageDialog();
+    return;
     QStringList filters;
     switch (dataType) {
     case Image: {
@@ -1060,3 +1065,23 @@ void EditDialog::openPrintDialog()
     delete dialog;
     delete document;
 }
+
+void EditDialog::openPrintImageDialog()
+{
+    QPrinter printer;
+    QPrintPreviewDialog *dialog = new QPrintPreviewDialog(&printer);
+
+    connect(dialog, &QPrintPreviewDialog::paintRequested, [&](QPrinter *previewPrinter) {
+            QPainter painter(previewPrinter);
+            QRect rect = painter.viewport();
+            QSize size = ui->editorImage->pixmap()->size();
+            size.scale(rect.size(), Qt::KeepAspectRatio);
+            painter.setViewport(rect.x(), rect.y(), size.width(), size.height());
+            painter.setWindow(ui->editorImage->pixmap()->rect());
+            painter.drawPixmap(0, 0, *ui->editorImage->pixmap());
+        });
+
+    dialog->exec();
+
+    delete dialog;
+}

src/EditDialog.h

@@ -43,6 +43,8 @@ private slots:
     void switchEditorMode(bool autoSwitchForType);
     void updateCellInfoAndMode(const QByteArray& data);
     void setMustIndentAndCompact(bool enable);
+    void openPrintDialog();
+    void openPrintImageDialog();
 
 signals:
     void recordTextUpdated(const QPersistentModelIndex& idx, const QByteArray& data, bool isBlob);
@@ -89,7 +91,6 @@ private:
     bool promptInvalidData(const QString& dataType, const QString& errorString);
     void setDataInBuffer(const QByteArray& data, DataSources source);
     void setStackCurrentIndex(int editMode);
-    void openPrintDialog();
 };
 
 #endif

src/EditDialog.ui

@@ -216,7 +216,11 @@
        </item>
       </layout>
      </widget>
-     <widget class="QWidget" name="editorBinary"/>
+     <widget class="QWidget" name="editorBinary">
+      <property name="contextMenuPolicy">
+       <enum>Qt::ActionsContextMenu</enum>
+      </property>
+     </widget>
      <widget class="QScrollArea" name="editorImageScrollArea">
       <property name="widgetResizable">
        <bool>true</bool>
@@ -233,6 +237,9 @@
        <layout class="QVBoxLayout" name="verticalLayout_2">
         <item>
          <widget class="QLabel" name="editorImage">
+          <property name="contextMenuPolicy">
+           <enum>Qt::ActionsContextMenu</enum>
+          </property>
           <property name="text">
            <string/>
           </property>
@@ -302,6 +309,36 @@ Errors are indicated with a red squiggle underline.</string>
     </layout>
    </item>
   </layout>
+  <action name="actionPrintImage">
+   <property name="icon">
+    <iconset resource="icons/icons.qrc">
+     <normaloff>:/icons/print</normaloff>:/icons/print</iconset>
+   </property>
+   <property name="text">
+    <string>Print...</string>
+   </property>
+   <property name="toolTip">
+    <string>Open preview dialog for printing displayed image</string>
+   </property>
+   <property name="shortcut">
+    <string>Ctrl+P</string>
+   </property>
+  </action>
+  <action name="actionPrint">
+   <property name="icon">
+    <iconset resource="icons/icons.qrc">
+     <normaloff>:/icons/print</normaloff>:/icons/print</iconset>
+   </property>
+   <property name="text">
+    <string>Print...</string>
+   </property>
+   <property name="toolTip">
+    <string>Open preview dialog for printing displayed text</string>
+   </property>
+   <property name="shortcut">
+    <string>Ctrl+P</string>
+   </property>
+  </action>
  </widget>
  <tabstops>
   <tabstop>buttonExport</tabstop>
@@ -439,6 +476,38 @@ Errors are indicated with a red squiggle underline.</string>
     </hint>
    </hints>
   </connection>
+  <connection>
+   <sender>actionPrintImage</sender>
+   <signal>triggered()</signal>
+   <receiver>EditDialog</receiver>
+   <slot>openPrintImageDialog()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>-1</x>
+     <y>-1</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>308</x>
+     <y>190</y>
+    </hint>
+   </hints>
+  </connection>
+  <connection>
+   <sender>actionPrint</sender>
+   <signal>triggered()</signal>
+   <receiver>EditDialog</receiver>
+   <slot>openPrintDialog()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>-1</x>
+     <y>-1</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>308</x>
+     <y>190</y>
+    </hint>
+   </hints>
+  </connection>
  </connections>
  <slots>
   <slot>importData()</slot>