iOS: Let QScreen manage UIWindow and root view-controller

Instead of having the application delegate set up a UIWindow and root
view-controller, we move the responsibility to QScreen, since in a multi
screen scenario we will need one UIWindow per screen, as well as one
root viewcontroller per window.

Change-Id: If5b0d44b8f8a697d830b33b4fe420bff56a7629b
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@digia.com>

src/plugins/platforms/ios/qiosapplicationdelegate.h

@@ -45,7 +45,4 @@
 #import "qiosviewcontroller.h"
 
 @interface QIOSApplicationDelegate : UIResponder <UIApplicationDelegate>
-
-@property (strong, nonatomic) UIWindow *window;
-
 @end

src/plugins/platforms/ios/qiosapplicationdelegate.mm

@@ -52,40 +52,6 @@
 
 @implementation QIOSApplicationDelegate
 
-@synthesize window;
-
-- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
-{
-    Q_UNUSED(application);
-    Q_UNUSED(launchOptions);
-
-    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
-    self.window.rootViewController = [[[QIOSViewController alloc] init] autorelease];
-
-#if QT_IOS_DEPLOYMENT_TARGET_BELOW(__IPHONE_7_0)
-    QSysInfo::MacVersion iosVersion = QSysInfo::MacintoshVersion;
-
-    // We prefer to keep the root viewcontroller in fullscreen layout, so that
-    // we don't have to compensate for the viewcontroller position. This also
-    // gives us the same behavior on iOS 5/6 as on iOS 7, where full screen layout
-    // is the only way.
-    if (iosVersion < QSysInfo::MV_IOS_7_0)
-        self.window.rootViewController.wantsFullScreenLayout = YES;
-
-    // Use translucent statusbar by default on iOS6 iPhones (unless the user changed
-    // the default in the Info.plist), so that windows placed under the stausbar are
-    // still visible, just like on iOS7.
-    if (iosVersion >= QSysInfo::MV_IOS_6_0 && iosVersion < QSysInfo::MV_IOS_7_0
-        && [UIDevice currentDevice].userInterfaceIdiom == UIUserInterfaceIdiomPhone
-        && [UIApplication sharedApplication].statusBarStyle == UIStatusBarStyleDefault)
-        [[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleBlackTranslucent];
-#endif
-
-    self.window.hidden = NO;
-
-    return YES;
-}
-
 - (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation
 {
     Q_UNUSED(application);
@@ -103,11 +69,5 @@
     return iosServices->handleUrl(QUrl::fromNSURL(url));
 }
 
-- (void)dealloc
-{
-    [window release];
-    [super dealloc];
-}
-
 @end
 

src/plugins/platforms/ios/qiosintegration.mm

@@ -72,7 +72,7 @@ QIOSIntegration *QIOSIntegration::instance()
 QIOSIntegration::QIOSIntegration()
     : m_fontDatabase(new QCoreTextFontDatabase)
     , m_clipboard(new QIOSClipboard)
-    , m_inputContext(new QIOSInputContext)
+    , m_inputContext(0)
     , m_platformServices(new QIOSServices)
     , m_accessibility(0)
 {
@@ -91,6 +91,9 @@ QIOSIntegration::QIOSIntegration()
     for (UIScreen *screen in [UIScreen screens])
         addScreen(new QIOSScreen(screen));
 
+    // Depends on a primary screen being present
+    m_inputContext = new QIOSInputContext;
+
     m_touchDevice = new QTouchDevice;
     m_touchDevice->setType(QTouchDevice::TouchScreen);
     m_touchDevice->setCapabilities(QTouchDevice::Position | QTouchDevice::NormalizedPosition);

src/plugins/platforms/ios/qiosscreen.h

@@ -80,6 +80,7 @@ public slots:
 
 private:
     UIScreen *m_uiScreen;
+    UIWindow *m_uiWindow;
     QRect m_geometry;
     QRect m_availableGeometry;
     int m_depth;

src/plugins/platforms/ios/qiosscreen.mm

@@ -181,8 +181,28 @@ static QString deviceModelIdentifier()
 QIOSScreen::QIOSScreen(UIScreen *screen)
     : QPlatformScreen()
     , m_uiScreen(screen)
+    , m_uiWindow(0)
     , m_orientationListener(0)
 {
+    for (UIWindow *existingWindow in [[UIApplication sharedApplication] windows]) {
+        if (existingWindow.screen == m_uiScreen) {
+            m_uiWindow = [m_uiWindow retain];
+            break;
+        }
+    }
+
+    if (!m_uiWindow) {
+        // Create a window and associated view-controller that we can use
+        m_uiWindow = [[UIWindow alloc] initWithFrame:[m_uiScreen bounds]];
+        m_uiWindow.rootViewController = [[[QIOSViewController alloc] initWithQIOSScreen:this] autorelease];
+
+        // FIXME: Only do once windows are added to the screen, and for any screen
+        if (screen == [UIScreen mainScreen]) {
+            m_uiWindow.screen = m_uiScreen;
+            m_uiWindow.hidden = NO;
+        }
+    }
+
     if (screen == [UIScreen mainScreen]) {
         QString deviceIdentifier = deviceModelIdentifier();
 
@@ -213,17 +233,12 @@ QIOSScreen::QIOSScreen(UIScreen *screen)
 QIOSScreen::~QIOSScreen()
 {
     [m_orientationListener release];
+    [m_uiWindow release];
 }
 
 void QIOSScreen::updateProperties()
 {
-    UIWindow *uiWindow = 0;
-    for (uiWindow in [[UIApplication sharedApplication] windows]) {
-        if (uiWindow.screen == m_uiScreen)
-            break;
-    }
-
-    bool inPortrait = UIInterfaceOrientationIsPortrait(uiWindow.rootViewController.interfaceOrientation);
+    bool inPortrait = UIInterfaceOrientationIsPortrait(m_uiWindow.rootViewController.interfaceOrientation);
     QRect geometry = inPortrait ? fromCGRect(m_uiScreen.bounds).toRect()
         : QRect(m_uiScreen.bounds.origin.x, m_uiScreen.bounds.origin.y,
             m_uiScreen.bounds.size.height, m_uiScreen.bounds.size.width);

src/plugins/platforms/ios/qiosviewcontroller.h

@@ -41,7 +41,13 @@
 
 #import <UIKit/UIKit.h>
 
-@interface QIOSViewController : UIViewController
+class QIOSScreen;
+
+@interface QIOSViewController : UIViewController {
+    QIOSScreen *m_screen;
+}
+
+- (id)initWithQIOSScreen:(QIOSScreen *)screen;
 - (BOOL)prefersStatusBarHidden;
 @end
 

src/plugins/platforms/ios/qiosviewcontroller.mm

@@ -53,6 +53,35 @@
 
 @implementation QIOSViewController
 
+- (id)initWithQIOSScreen:(QIOSScreen *)screen
+{
+    if (self = [self init]) {
+        m_screen = screen;
+
+#if QT_IOS_DEPLOYMENT_TARGET_BELOW(__IPHONE_7_0)
+        QSysInfo::MacVersion iosVersion = QSysInfo::MacintoshVersion;
+
+        // We prefer to keep the root viewcontroller in fullscreen layout, so that
+        // we don't have to compensate for the viewcontroller position. This also
+        // gives us the same behavior on iOS 5/6 as on iOS 7, where full screen layout
+        // is the only way.
+        if (iosVersion < QSysInfo::MV_IOS_7_0)
+            self.wantsFullScreenLayout = YES;
+
+        // Use translucent statusbar by default on iOS6 iPhones (unless the user changed
+        // the default in the Info.plist), so that windows placed under the stausbar are
+        // still visible, just like on iOS7.
+        if (screen->uiScreen() == [UIScreen mainScreen]
+            && iosVersion >= QSysInfo::MV_IOS_6_0 && iosVersion < QSysInfo::MV_IOS_7_0
+            && [UIDevice currentDevice].userInterfaceIdiom == UIUserInterfaceIdiomPhone
+            && [UIApplication sharedApplication].statusBarStyle == UIStatusBarStyleDefault)
+            [[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleBlackTranslucent];
+#endif
+    }
+
+    return self;
+}
+
 -(BOOL)shouldAutorotate
 {
     // Until a proper orientation and rotation API is in place, we always auto rotate.
@@ -85,8 +114,7 @@
     if (!QCoreApplication::instance())
         return; // FIXME: Store orientation for later (?)
 
-    QIOSScreen *qiosScreen = static_cast<QIOSScreen *>(QGuiApplication::primaryScreen()->handle());
-    qiosScreen->updateProperties();
+    m_screen->updateProperties();
 }
 
 #if QT_IOS_PLATFORM_SDK_EQUAL_OR_ABOVE(__IPHONE_7_0)