QPrinter - Fix DuplexMode on all platforms

Add support to get/set the DuplexMode on Windows and Mac, improve the
CUPS duplex handling, ensure support is the same on all platforms.

[ChangeLog][QtPrintSupport][QPrinter] Added duplex support for Windows
and OS X.

Task-number: QTBUG-11332
Change-Id: I9d61d63233d828c3b1fd6df54072c6049f3c6298
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Lars Knoll <lars.knoll@digia.com>

1 files changed, 47 insertions, 7 deletions

diff --git a/src/printsupport/kernel/qprintengine_win.cpp b/src/printsupport/kernel/qprintengine_win.cpp
index a1a2f97abe..90b204eb0c 100644
--- a/src/printsupport/kernel/qprintengine_win.cpp
+++ b/src/printsupport/kernel/qprintengine_win.cpp
@@ -1003,9 +1003,6 @@ void QWin32PrintEngine::setProperty(PrintEnginePropertyKey key, const QVariant &
     // The following keys are settings that are unsupported by the Windows PrintEngine
     case PPK_CustomBase:
         break;
-    case PPK_Duplex:
-        // TODO Add support using DEVMODE.dmDuplex
-        break;
     case PPK_FontEmbedding:
         break;
     case PPK_PageOrder:
@@ -1046,6 +1043,33 @@ void QWin32PrintEngine::setProperty(PrintEnginePropertyKey key, const QVariant &
         d->docName = value.toString();
         break;
 
+    case PPK_Duplex: {
+        if (!d->devMode)
+            break;
+        QPrint::DuplexMode mode = QPrint::DuplexMode(value.toInt());
+        if (mode == property(PPK_Duplex).toInt() || !d->m_printDevice.supportedDuplexModes().contains(mode))
+            break;
+        switch (mode) {
+        case QPrinter::DuplexNone:
+            d->devMode->dmDuplex = DMDUP_SIMPLEX;
+            break;
+        case QPrinter::DuplexAuto:
+            d->devMode->dmDuplex = d->m_pageLayout.orientation() == QPageLayout::Landscape ? DMDUP_HORIZONTAL : DMDUP_VERTICAL;
+            break;
+        case QPrinter::DuplexLongSide:
+            d->devMode->dmDuplex = DMDUP_VERTICAL;
+            break;
+        case QPrinter::DuplexShortSide:
+            d->devMode->dmDuplex = DMDUP_HORIZONTAL;
+            break;
+        default:
+            // Don't change
+            break;
+        }
+        d->doReinit();
+        break;
+    }
+
     case PPK_FullPage:
         if (value.toBool())
             d->m_pageLayout.setMode(QPageLayout::FullPageMode);
@@ -1260,10 +1284,6 @@ QVariant QWin32PrintEngine::property(PrintEnginePropertyKey key) const
 
     // The following keys are settings that are unsupported by the Windows PrintEngine
     // Return sensible default values to ensure consistent behavior across platforms
-    case PPK_Duplex:
-        // TODO Add support using DEVMODE.dmDuplex
-        value = QPrinter::DuplexNone;
-        break;
     case PPK_FontEmbedding:
         value = false;
         break;
@@ -1300,6 +1320,26 @@ QVariant QWin32PrintEngine::property(PrintEnginePropertyKey key) const
         value = d->docName;
         break;
 
+    case PPK_Duplex: {
+        if (!d->devMode) {
+            value = QPrinter::DuplexNone;
+        } else {
+            switch (d->devMode->dmDuplex) {
+            case DMDUP_VERTICAL:
+                value = QPrinter::DuplexLongSide;
+                break;
+            case DMDUP_HORIZONTAL:
+                value = QPrinter::DuplexShortSide;
+                break;
+            case DMDUP_SIMPLEX:
+            default:
+                value = QPrinter::DuplexNone;
+                break;
+            }
+        }
+        break;
+    }
+
     case PPK_FullPage:
         value =  d->m_pageLayout.mode() == QPageLayout::FullPageMode;
         break;