StackView: add attached activated() etc. signals

For initializing and cleaning up item-specific resources, these are
much more convenient than a StackView.onStatusChanged handler.

[ChangeLog][StackView] Added attached activated(), deactivated(),
activating(), and deactivating() signals that are convenient for
initializing and cleaning up item-specific resources.

Change-Id: If8df45b31a14cd2491db2c87eeb1c071af4e695f
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>

1 files changed, 61 insertions, 0 deletions

diff --git a/tests/auto/controls/data/tst_stackview.qml b/tests/auto/controls/data/tst_stackview.qml
index 9966fa47..0e1f1fbe 100644
--- a/tests/auto/controls/data/tst_stackview.qml
+++ b/tests/auto/controls/data/tst_stackview.qml
@@ -59,6 +59,11 @@ TestCase {
         StackView { }
     }
 
+    Component {
+        id: signalSpy
+        SignalSpy { }
+    }
+
     function test_initialItem() {
         var control1 = stackView.createObject(testCase)
         verify(control1)
@@ -856,4 +861,60 @@ TestCase {
 
         control.destroy()
     }
+
+    Component {
+        id: signalTest
+        Control {
+            id: ctrl
+            property SignalSpy activatedSpy: SignalSpy { target: ctrl.StackView; signalName: "activated" }
+            property SignalSpy activatingSpy: SignalSpy { target: ctrl.StackView; signalName: "activating" }
+            property SignalSpy deactivatedSpy: SignalSpy { target: ctrl.StackView; signalName: "deactivated" }
+            property SignalSpy deactivatingSpy: SignalSpy { target: ctrl.StackView; signalName: "deactivating" }
+        }
+    }
+
+    function test_signals() {
+        var control = stackView.createObject(testCase)
+        verify(control)
+
+        var item1 = signalTest.createObject(control)
+        compare(item1.StackView.status, StackView.Inactive)
+        control.push(item1)
+        compare(item1.StackView.status, StackView.Active)
+        compare(item1.activatedSpy.count, 1)
+        compare(item1.activatingSpy.count, 1)
+        compare(item1.deactivatedSpy.count, 0)
+        compare(item1.deactivatingSpy.count, 0)
+
+        var item2 = signalTest.createObject(control)
+        compare(item2.StackView.status, StackView.Inactive)
+        control.push(item2)
+        compare(item2.StackView.status, StackView.Activating)
+        compare(item2.activatedSpy.count, 0)
+        compare(item2.activatingSpy.count, 1)
+        compare(item2.deactivatedSpy.count, 0)
+        compare(item2.deactivatingSpy.count, 0)
+        compare(item1.StackView.status, StackView.Deactivating)
+        compare(item1.activatedSpy.count, 1)
+        compare(item1.activatingSpy.count, 1)
+        compare(item1.deactivatedSpy.count, 0)
+        compare(item1.deactivatingSpy.count, 1)
+        tryCompare(item2.activatedSpy, "count", 1)
+        tryCompare(item1.deactivatedSpy, "count", 1)
+
+        control.pop()
+        compare(item2.StackView.status, StackView.Deactivating)
+        compare(item2.activatedSpy.count, 1)
+        compare(item2.activatingSpy.count, 1)
+        compare(item2.deactivatedSpy.count, 0)
+        compare(item2.deactivatingSpy.count, 1)
+        compare(item1.StackView.status, StackView.Activating)
+        compare(item1.activatedSpy.count, 1)
+        compare(item1.activatingSpy.count, 2)
+        compare(item1.deactivatedSpy.count, 1)
+        compare(item1.deactivatingSpy.count, 1)
+        tryCompare(item1.activatedSpy, "count", 2)
+
+        control.destroy()
+    }
 }