Expose QQuickCheckDelegate::nextCheckState() to QML

Same as 043e3d24 for CheckBox.

[ChangeLog][Controls][CheckDelegate] Made it possible to implement
nextCheckState() in QML.

Task-number: QTBUG-63238
Change-Id: Id765191b1e5559393696183ffea9ed9c69eed475
Reviewed-by: Liang Qi <liang.qi@qt.io>

1 files changed, 47 insertions, 0 deletions

diff --git a/tests/auto/controls/data/tst_checkdelegate.qml b/tests/auto/controls/data/tst_checkdelegate.qml
index 9f92b4dc..72b45251 100644
--- a/tests/auto/controls/data/tst_checkdelegate.qml
+++ b/tests/auto/controls/data/tst_checkdelegate.qml
@@ -170,4 +170,51 @@ TestCase {
             break;
         }
     }
+
+    Component {
+        id: nextCheckStateDelegate
+        CheckDelegate {
+            tristate: true
+            nextCheckState: function() {
+                if (checkState === Qt.Checked)
+                    return Qt.Unchecked
+                else
+                    return Qt.Checked
+            }
+        }
+    }
+
+    function test_nextCheckState_data() {
+        return [
+            { tag: "unchecked", checkState: Qt.Unchecked, expectedState: Qt.Checked },
+            { tag: "partially-checked", checkState: Qt.PartiallyChecked, expectedState: Qt.Checked },
+            { tag: "checked", checkState: Qt.Checked, expectedState: Qt.Unchecked }
+        ]
+    }
+
+    function test_nextCheckState(data) {
+        var control = createTemporaryObject(nextCheckStateDelegate, testCase)
+        verify(control)
+
+        // mouse
+        control.checkState = data.checkState
+        compare(control.checkState, data.checkState)
+        mouseClick(control)
+        compare(control.checkState, data.expectedState)
+
+        // touch
+        control.checkState = data.checkState
+        compare(control.checkState, data.checkState)
+        var touch = touchEvent(control)
+        touch.press(0, control).commit().release(0, control).commit()
+        compare(control.checkState, data.expectedState)
+
+        // keyboard
+        control.forceActiveFocus()
+        tryCompare(control, "activeFocus", true)
+        control.checkState = data.checkState
+        compare(control.checkState, data.checkState)
+        keyClick(Qt.Key_Space)
+        compare(control.checkState, data.expectedState)
+    }
 }