QPA: Introducing QPlatformTheme standardPixmap(), fileIconPixmap()

The basic idea is that the platform theme is now responsible for
providing the pixmaps for the given standard name, or any file or
directory. Then, the QStyle implementation should query the platform
theme for the pixmaps, and build the icons accordingly using
ThemeHint::IconPixmapSizes. Same thing for QFileIconProvider. This
also opens future support for getting platform dependent pixmaps in
QtQuick components.

Also includes the implementation for the Cocoa (QCocoaTheme) and
Windows (QWindowsTheme) platform plugins.

Task-number: QTBUG-27450
Change-Id: I4e8406585d970a9af481be10f6643cf0abbc38a3
Reviewed-by: Gabriel de Dietrich <gabriel.dedietrich@digia.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Jens Bache-Wiig <jens.bache-wiig@digia.com>
Reviewed-by: Morten Johan Sørvig <morten.sorvig@digia.com>

2 files changed, 146 insertions, 0 deletions

diff --git a/src/plugins/platforms/cocoa/qcocoatheme.h b/src/plugins/platforms/cocoa/qcocoatheme.h
index a747a82d09..0ff160957f 100644
--- a/src/plugins/platforms/cocoa/qcocoatheme.h
+++ b/src/plugins/platforms/cocoa/qcocoatheme.h
@@ -67,6 +67,8 @@ public:
 
     const QPalette *palette(Palette type = SystemPalette) const;
     const QFont *font(Font type = SystemFont) const;
+    QPixmap standardPixmap(StandardPixmap sp, const QSizeF &size) const;
+    QPixmap fileIconPixmap(const QFileInfo &fileInfo, const QSizeF &size) const;
 
     QVariant themeHint(ThemeHint hint) const;
 
diff --git a/src/plugins/platforms/cocoa/qcocoatheme.mm b/src/plugins/platforms/cocoa/qcocoatheme.mm
index ddb550dd5f..967d65faec 100644
--- a/src/plugins/platforms/cocoa/qcocoatheme.mm
+++ b/src/plugins/platforms/cocoa/qcocoatheme.mm
@@ -54,7 +54,9 @@
 #include "qcocoamenu.h"
 #include "qcocoamenubar.h"
 
+#include <QtCore/qfileinfo.h>
 #include <QtGui/private/qguiapplication_p.h>
+#include <QtGui/qpainter.h>
 #include <qpa/qplatformintegration.h>
 #include <qpa/qplatformnativeinterface.h>
 
@@ -135,6 +137,143 @@ const QFont *QCocoaTheme::font(Font type) const
     return m_fonts.value(type, 0);
 }
 
+// Defined in qpaintengine_mac.mm
+extern CGContextRef qt_mac_cg_context(const QPaintDevice *pdev);
+
+//! \internal
+QPixmap qt_mac_convert_iconref(const IconRef icon, int width, int height)
+{
+    QPixmap ret(width, height);
+    ret.fill(QColor(0, 0, 0, 0));
+
+    CGRect rect = CGRectMake(0, 0, width, height);
+
+    CGContextRef ctx = qt_mac_cg_context(&ret);
+    CGAffineTransform old_xform = CGContextGetCTM(ctx);
+    CGContextConcatCTM(ctx, CGAffineTransformInvert(old_xform));
+    CGContextConcatCTM(ctx, CGAffineTransformIdentity);
+
+    ::RGBColor b;
+    b.blue = b.green = b.red = 255*255;
+    PlotIconRefInContext(ctx, &rect, kAlignNone, kTransformNone, &b, kPlotIconRefNormalFlags, icon);
+    CGContextRelease(ctx);
+    return ret;
+}
+
+QPixmap QCocoaTheme::standardPixmap(StandardPixmap sp, const QSizeF &size) const
+{
+    OSType iconType = 0;
+    switch (sp) {
+    case MessageBoxQuestion:
+        iconType = kQuestionMarkIcon;
+        break;
+    case MessageBoxInformation:
+        iconType = kAlertNoteIcon;
+        break;
+    case MessageBoxWarning:
+        iconType = kAlertCautionIcon;
+        break;
+    case MessageBoxCritical:
+        iconType = kAlertStopIcon;
+        break;
+    case DesktopIcon:
+        iconType = kDesktopIcon;
+        break;
+    case TrashIcon:
+        iconType = kTrashIcon;
+        break;
+    case ComputerIcon:
+        iconType = kComputerIcon;
+        break;
+    case DriveFDIcon:
+        iconType = kGenericFloppyIcon;
+        break;
+    case DriveHDIcon:
+        iconType = kGenericHardDiskIcon;
+        break;
+    case DriveCDIcon:
+    case DriveDVDIcon:
+        iconType = kGenericCDROMIcon;
+        break;
+    case DriveNetIcon:
+        iconType = kGenericNetworkIcon;
+        break;
+    case DirOpenIcon:
+        iconType = kOpenFolderIcon;
+        break;
+    case DirClosedIcon:
+    case DirLinkIcon:
+        iconType = kGenericFolderIcon;
+        break;
+    case FileLinkIcon:
+    case FileIcon:
+        iconType = kGenericDocumentIcon;
+        break;
+    default:
+        break;
+    }
+    if (iconType != 0) {
+        QPixmap pixmap;
+        IconRef icon;
+        IconRef overlayIcon = 0;
+        if (iconType != kGenericApplicationIcon) {
+            GetIconRef(kOnSystemDisk, kSystemIconsCreator, iconType, &icon);
+        } else {
+            FSRef fsRef;
+            ProcessSerialNumber psn = { 0, kCurrentProcess };
+            GetProcessBundleLocation(&psn, &fsRef);
+            GetIconRefFromFileInfo(&fsRef, 0, 0, 0, 0, kIconServicesNormalUsageFlag, &icon, 0);
+            if (sp == MessageBoxCritical) {
+                overlayIcon = icon;
+                GetIconRef(kOnSystemDisk, kSystemIconsCreator, kAlertCautionIcon, &icon);
+            }
+        }
+
+        if (icon) {
+            pixmap = qt_mac_convert_iconref(icon, size.width(), size.height());
+            ReleaseIconRef(icon);
+        }
+
+        if (overlayIcon) {
+            QSizeF littleSize = size / 2;
+            QPixmap overlayPix = qt_mac_convert_iconref(overlayIcon, littleSize.width(), littleSize.height());
+            QPainter painter(&pixmap);
+            painter.drawPixmap(littleSize.width(), littleSize.height(), overlayPix);
+            ReleaseIconRef(overlayIcon);
+        }
+
+        return pixmap;
+    }
+
+    return QPlatformTheme::standardPixmap(sp, size);
+}
+
+QPixmap QCocoaTheme::fileIconPixmap(const QFileInfo &fileInfo, const QSizeF &size) const
+{
+    FSRef macRef;
+    OSStatus status = FSPathMakeRef(reinterpret_cast<const UInt8*>(fileInfo.canonicalFilePath().toUtf8().constData()),
+                                    &macRef, 0);
+    if (status != noErr)
+        return QPixmap();
+    FSCatalogInfo info;
+    HFSUniStr255 macName;
+    status = FSGetCatalogInfo(&macRef, kIconServicesCatalogInfoMask, &info, &macName, 0, 0);
+    if (status != noErr)
+        return QPixmap();
+    IconRef iconRef;
+    SInt16 iconLabel;
+    status = GetIconRefFromFileInfo(&macRef, macName.length, macName.unicode,
+                                    kIconServicesCatalogInfoMask, &info, kIconServicesNormalUsageFlag,
+                                    &iconRef, &iconLabel);
+    if (status != noErr)
+        return QPixmap();
+
+    QPixmap pixmap = qt_mac_convert_iconref(iconRef, size.width(), size.height());
+    ReleaseIconRef(iconRef);
+
+    return pixmap;
+}
+
 QVariant QCocoaTheme::themeHint(ThemeHint hint) const
 {
     switch (hint) {
@@ -146,6 +285,11 @@ QVariant QCocoaTheme::themeHint(ThemeHint hint) const
         return QVariant(int(MacKeyboardScheme));
     case TabAllWidgets:
         return QVariant(bool([[NSApplication sharedApplication] isFullKeyboardAccessEnabled]));
+    case IconPixmapSizes: {
+        QList<int> sizes;
+        sizes << 16 << 32 << 64 << 128;
+        return QVariant::fromValue(sizes);
+    }
     default:
         break;
     }