iOS: Add platform plugin option to debug window management

When the 'debugWindowManagement' option is enabled, e.g. by passing the
argument -platform ios:debugWindowManagement to the application, the
plugin will add a background color and outline to all QUIViews, as
well as draw a grid for the underlying QUIViewController. This makes
it easier to see where windows are placed when the window itself
doesn't draw anything, e.g. in unit tests.

Change-Id: If9a59822e0b320b154ad8e338f9fb5ec7cf191a2
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@theqtcompany.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/src/plugins/platforms/ios/quiview.mm b/src/plugins/platforms/ios/quiview.mm
index f36cbaf685..a56db1d6f5 100644
--- a/src/plugins/platforms/ios/quiview.mm
+++ b/src/plugins/platforms/ios/quiview.mm
@@ -73,6 +73,20 @@
             self.hidden = YES;
 
         self.multipleTouchEnabled = YES;
+
+        if (QIOSIntegration::instance()->debugWindowManagement()) {
+            static CGFloat hue = 0.0;
+            CGFloat lastHue = hue;
+            for (CGFloat diff = 0; diff < 0.1 || diff > 0.9; diff = fabsf(hue - lastHue))
+                hue = drand48();
+
+            #define colorWithBrightness(br) \
+                [UIColor colorWithHue:hue saturation:0.5 brightness:br alpha:1.0].CGColor
+
+            self.layer.backgroundColor = colorWithBrightness(0.5);
+            self.layer.borderColor = colorWithBrightness(1.0);
+            self.layer.borderWidth = 1.0;
+        }
     }
 
     return self;