convenience option for duplex printing of multiple files (IDEA-164472)

platform/lang-impl/src/com/intellij/codeEditor/printing/MultiFilePainter.java

@@ -26,12 +26,15 @@ import java.util.List;
 
 class MultiFilePainter extends BasePainter {
   private final List<PsiFile> myFilesList;
+  private final boolean myEvenNumberOfPagesPerFile;
   private int myFileIndex = 0;
   private int myStartPageIndex = 0;
   private TextPainter myTextPainter = null;
+  private int myLargestPrintedPage = -1;
 
-  public MultiFilePainter(List<PsiFile> filesList) {
+  public MultiFilePainter(List<PsiFile> filesList, boolean evenNumberOfPagesPerFile) {
     myFilesList = filesList;
+    myEvenNumberOfPagesPerFile = evenNumberOfPagesPerFile;
   }
 
   @Override
@@ -57,13 +60,19 @@ class MultiFilePainter extends BasePainter {
           return Printable.NO_SUCH_PAGE;
         }
         if (ret == Printable.PAGE_EXISTS) {
+          myLargestPrintedPage = pageIndex;
           return Printable.PAGE_EXISTS;
         }
+        if (myEvenNumberOfPagesPerFile && pageIndex == (myLargestPrintedPage + 1) && (pageIndex % 2) == 1 &&
+            myFileIndex < (myFilesList.size() - 1)) {
+          return PAGE_EXISTS;
+        }
         myTextPainter.dispose();
         myTextPainter = null;
         myStartPageIndex = pageIndex;
       }
       myFileIndex++;
+      myLargestPrintedPage = -1;
     }
     return Printable.NO_SUCH_PAGE;
   }

platform/lang-impl/src/com/intellij/codeEditor/printing/PrintDialog.java

@@ -63,6 +63,7 @@ class PrintDialog extends DialogWrapper {
   private JTextField myRightMarginField = null;
 
   private JCheckBox myCbDrawBorder = null;
+  private JCheckBox myCbEvenNumberOfPages = null;
 
   private JTextField myLineTextField1 = null;
   private JComboBox myLinePlacementCombo1 = null;
@@ -144,12 +145,7 @@ class PrintDialog extends DialogWrapper {
     buttonGroup.add(myRbSelectedText);
     buttonGroup.add(myRbCurrentPackage);
 
-    ActionListener actionListener = new ActionListener() {
-      @Override
-      public void actionPerformed(ActionEvent e) {
-        myCbIncludeSubpackages.setEnabled(myRbCurrentPackage.isSelected());
-      }
-    };
+    ActionListener actionListener = e -> updateDependentComponents();
 
     myRbCurrentFile.addActionListener(actionListener);
     myRbSelectedText.addActionListener(actionListener);
@@ -158,6 +154,11 @@ class PrintDialog extends DialogWrapper {
     return panel;
   }
 
+  private void updateDependentComponents() {
+    myCbIncludeSubpackages.setEnabled(myRbCurrentPackage.isSelected());
+    myCbEvenNumberOfPages.setVisible(myRbCurrentFile.isSelected() && mySelectedFileCount > 1 || myRbCurrentPackage.isSelected());
+  }
+
   @Override
   protected JComponent createCenterPanel() {
     TabbedPaneWrapper tabbedPaneWrapper = new TabbedPaneWrapper(myDisposable);
@@ -211,6 +212,10 @@ class PrintDialog extends DialogWrapper {
     gbConstraints.gridy++;
     panel.add(myCbDrawBorder, gbConstraints);
 
+    myCbEvenNumberOfPages = new JCheckBox(CodeEditorBundle.message("print.settings.even.number.of.pages"));
+    gbConstraints.gridy++;
+    panel.add(myCbEvenNumberOfPages, gbConstraints);
+
     gbConstraints.insets = new Insets(0, 0, 6, 4);
     gbConstraints.gridx = 0;
     gbConstraints.gridwidth = 3;
@@ -515,7 +520,8 @@ class PrintDialog extends DialogWrapper {
     myRbCurrentPackage.setSelected(myDirectoryName != null && !isSelectedTextEnabled && myFileName == null);
 
     myCbIncludeSubpackages.setSelected(printSettings.isIncludeSubdirectories());
-    myCbIncludeSubpackages.setEnabled(myRbCurrentPackage.isSelected());
+
+    updateDependentComponents();
 
     Object selectedPageSize = PageSizes.getItem(printSettings.PAPER_SIZE);
     if(selectedPageSize != null) {
@@ -549,7 +555,7 @@ class PrintDialog extends DialogWrapper {
     myRightMarginField.setText(String.valueOf(printSettings.RIGHT_MARGIN));
 
     myCbDrawBorder.setSelected(printSettings.DRAW_BORDER);
-
+    myCbEvenNumberOfPages.setSelected(printSettings.EVEN_NUMBER_OF_PAGES);
 
     myLineTextField1.setText(printSettings.FOOTER_HEADER_TEXT1);
     myLinePlacementCombo1.setSelectedItem(printSettings.FOOTER_HEADER_PLACEMENT1);
@@ -618,6 +624,7 @@ class PrintDialog extends DialogWrapper {
     catch(NumberFormatException ignored) { }
 
     printSettings.DRAW_BORDER = myCbDrawBorder.isSelected();
+    printSettings.EVEN_NUMBER_OF_PAGES = myCbEvenNumberOfPages.isSelected();
     printSettings.FOOTER_HEADER_TEXT1 = myLineTextField1.getText();
     printSettings.FOOTER_HEADER_ALIGNMENT1 = (String)myLineAlignmentCombo1.getSelectedItem();
     printSettings.FOOTER_HEADER_PLACEMENT1 = (String)myLinePlacementCombo1.getSelectedItem();

platform/lang-impl/src/com/intellij/codeEditor/printing/PrintManager.java

@@ -98,13 +98,13 @@ class PrintManager {
 
     PrintSettings printSettings = PrintSettings.getInstance();
     if (printSettings.getPrintScope() == PrintSettings.PRINT_FILE && psiFiles.size() > 1) {
-      painter = new MultiFilePainter(psiFiles);
+      painter = new MultiFilePainter(psiFiles, printSettings.EVEN_NUMBER_OF_PAGES);
     }
     else if (printSettings.getPrintScope() == PrintSettings.PRINT_DIRECTORY) {
       List<PsiFile> filesList = ContainerUtil.newArrayList();
       boolean isRecursive = printSettings.isIncludeSubdirectories();
       addToPsiFileList(psiDirectory, filesList, isRecursive);
-      painter = new MultiFilePainter(filesList);
+      painter = new MultiFilePainter(filesList, printSettings.EVEN_NUMBER_OF_PAGES);
     }
     else {
       if (psiFile == null && editor == null) return;

platform/lang-impl/src/com/intellij/codeEditor/printing/PrintSettings.java

@@ -47,6 +47,8 @@ public class PrintSettings implements PersistentStateComponent<PrintSettings> {
 
   public boolean DRAW_BORDER = true;
 
+  public boolean EVEN_NUMBER_OF_PAGES = false;
+
   public String FOOTER_HEADER_TEXT1 = CodeEditorBundle.message("print.header.default.line.1");
   public String FOOTER_HEADER_PLACEMENT1 = HEADER;
   public String FOOTER_HEADER_ALIGNMENT1 = LEFT;

platform/platform-resources-en/src/messages/CodeEditorBundle.properties

@@ -29,6 +29,7 @@ print.settings.paper.size.label=Paper size
 print.settings.font.label=Font
 print.settings.show.line.numbers.checkbox=Show line numbers
 print.settings.draw.border.checkbox=Draw border
+print.settings.even.number.of.pages=Even number of pages per file (for duplex printing)
 print.orientation.group=Orientation
 print.orientation.portrait.radio=Portrait
 print.orientation.landscape.radio=Landscape