public void LayoutManager_Should_Recover_From_Infinite_Loop_On_Measure()
{
// Test for issue #3041.
var control = new LayoutTestControl();
var root = new LayoutTestRoot {
Child = control
};
root.LayoutManager.ExecuteInitialLayoutPass(root);
control.Measured = false;
control.DoMeasureOverride = (l, s) =>
{
control.InvalidateMeasure();
return(new Size(100, 100));
};
control.InvalidateMeasure();
root.LayoutManager.ExecuteLayoutPass();
// This is the important part: running a second layout pass in which we exceed the maximum
// retries causes LayoutQueue<T>.Info.Count to exceed _maxEnqueueCountPerLoop.
root.LayoutManager.ExecuteLayoutPass();
control.Measured = false;
control.DoMeasureOverride = null;
root.LayoutManager.ExecuteLayoutPass();
Assert.True(control.Measured);
Assert.True(control.IsMeasureValid);
}
public void LayoutManager_Should_Prevent_Infinite_Loop_On_Measure()
{
var control = new LayoutTestControl();
var root = new LayoutTestRoot {
Child = control
};
root.LayoutManager.ExecuteInitialLayoutPass(root);
control.Measured = false;
int cnt = 0;
int maxcnt = 100;
control.DoMeasureOverride = (l, s) =>
{
//emulate a problem in the logic of a control that triggers
//invalidate measure during measure
//it can lead to an infinite loop in layoutmanager
if (++cnt < maxcnt)
{
control.InvalidateMeasure();
}
return(new Size(100, 100));
};
control.InvalidateMeasure();
root.LayoutManager.ExecuteLayoutPass();
Assert.True(cnt < 100);
}
public void Calling_ExecuteLayoutPass_From_ExecuteInitialLayoutPass_Does_Not_Break_Measure()
{
// Test for issue #3550.
var control = new LayoutTestControl();
var root = new LayoutTestRoot {
Child = control
};
var count = 0;
root.LayoutManager.ExecuteInitialLayoutPass(root);
control.Measured = false;
control.DoMeasureOverride = (l, s) =>
{
if (count++ == 0)
{
control.InvalidateMeasure();
root.LayoutManager.ExecuteLayoutPass();
return(new Size(100, 100));
}
else
{
return(new Size(200, 200));
}
};
root.InvalidateMeasure();
control.InvalidateMeasure();
root.LayoutManager.ExecuteInitialLayoutPass(root);
Assert.Equal(new Size(200, 200), control.Bounds.Size);
Assert.Equal(new Size(200, 200), control.DesiredSize);
}
public void Measures_In_Correct_Order()
{
LayoutTestControl control1;
LayoutTestControl control2;
var root = new LayoutTestRoot
{
Child = control1 = new LayoutTestControl
{
Child = control2 = new LayoutTestControl(),
}
};
var order = new List <ILayoutable>();
Size MeasureOverride(ILayoutable control, Size size)
{
order.Add(control);
return(new Size(10, 10));
}
root.DoMeasureOverride = MeasureOverride;
control1.DoMeasureOverride = MeasureOverride;
control2.DoMeasureOverride = MeasureOverride;
root.LayoutManager.ExecuteInitialLayoutPass(root);
control2.InvalidateMeasure();
control1.InvalidateMeasure();
root.InvalidateMeasure();
order.Clear();
root.LayoutManager.ExecuteLayoutPass();
Assert.Equal(new ILayoutable[] { root, control1, control2 }, order);
}
public void Measures_And_Arranges_InvalidateMeasured_Control()
{
var control = new LayoutTestControl();
var root = new LayoutTestRoot {
Child = control
};
root.LayoutManager.ExecuteInitialLayoutPass(root);
control.Measured = control.Arranged = false;
control.InvalidateMeasure();
root.LayoutManager.ExecuteLayoutPass();
Assert.True(control.Measured);
Assert.True(control.Arranged);
}
public void Doesnt_Measure_And_Arrange_InvalidateMeasured_Control_When_TopLevel_Is_Not_Visible()
{
var control = new LayoutTestControl();
var root = new LayoutTestRoot {
Child = control, IsVisible = false
};
root.LayoutManager.ExecuteInitialLayoutPass();
control.Measured = control.Arranged = false;
control.InvalidateMeasure();
root.LayoutManager.ExecuteLayoutPass();
Assert.False(control.Measured);
Assert.False(control.Arranged);
}
public void Doesnt_Measure_Removed_Control()
{
var control = new LayoutTestControl();
var root = new LayoutTestRoot {
Child = control
};
root.LayoutManager.ExecuteInitialLayoutPass(root);
control.Measured = control.Arranged = false;
control.InvalidateMeasure();
root.Child = null;
root.LayoutManager.ExecuteLayoutPass();
Assert.False(control.Measured);
Assert.False(control.Arranged);
}
public void Doesnt_Measure_Non_Invalidated_Root()
{
var control = new LayoutTestControl();
var root = new LayoutTestRoot {
Child = control
};
root.LayoutManager.ExecuteInitialLayoutPass();
root.Measured = root.Arranged = false;
control.Measured = control.Arranged = false;
control.InvalidateMeasure();
root.LayoutManager.ExecuteLayoutPass();
Assert.False(root.Measured);
Assert.False(root.Arranged);
Assert.True(control.Measured);
Assert.True(control.Arranged);
}