ScrollBar: add increase(), decrease() and stepSize

Change-Id: I052b650fee7ae94cc826446d285d653a41bd1e75
Reviewed-by: Mitch Curtis <mitch.curtis@theqtcompany.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/tests/auto/controls/data/tst_scrollbar.qml b/tests/auto/controls/data/tst_scrollbar.qml
index 55f31e12..9fa6496e 100644
--- a/tests/auto/controls/data/tst_scrollbar.qml
+++ b/tests/auto/controls/data/tst_scrollbar.qml
@@ -210,4 +210,42 @@ TestCase {
 
         control.destroy()
     }
+
+    function test_stepSize_data() {
+        return [
+            { tag: "0.0", stepSize: 0.0 },
+            { tag: "0.1", stepSize: 0.1 },
+            { tag: "0.5", stepSize: 0.5 }
+        ]
+    }
+
+    function test_stepSize(data) {
+        var control = scrollBar.createObject(testCase, {stepSize: data.stepSize})
+        verify(control)
+
+        compare(control.stepSize, data.stepSize)
+        compare(control.position, 0.0)
+
+        var count = 10
+        if (data.stepSize !== 0.0)
+            count = 1.0 / data.stepSize
+
+        // increase until 1.0
+        for (var i = 1; i <= count; ++i) {
+            control.increase()
+            compare(control.position, i / count)
+        }
+        control.increase()
+        compare(control.position, 1.0)
+
+        // decrease until 0.0
+        for (var d = count - 1; d >= 0; --d) {
+            control.decrease()
+            compare(control.position, d / count)
+        }
+        control.decrease()
+        compare(control.position, 0.0)
+
+        control.destroy()
+    }
 }