public void Run()
{
RenderOptions.ProcessRenderMode = RenderMode.SoftwareOnly;
var visualizer = new MenuViewMessageInterpreter();
var state = new MenuViewMessage {
Items =
{
MenuItemViewMessage.MakeRange("[-1, 1]: 0.5", -1, +1, 0.5, false),
MenuItemViewMessage.MakeRange("[-1, 1]: -1", -1, +1, -1, true),
MenuItemViewMessage.MakeRange("[-1, 1]: 0", -1, +1, 0, false),
MenuItemViewMessage.MakeRange("[-1, 1]: +1", -1, +1, +1, false),
MenuItemViewMessage.MakeRange("[0, 1]: 0.5", 0, 1, 0.5, false),
MenuItemViewMessage.MakeRange("[0, 1]: 0", 0, 1, 0, false),
MenuItemViewMessage.MakeRange("[0, 1]: 1", 0, 1, 1, false)
}
};
var visual = visualizer.Interpret(state);
var window = new Window {
Background = Brushes.Pink,
Content = visual
};
window.Show();
Dispatcher.Run();
}
public UIElement Interpret(MenuViewMessage state)
{
var canvas = new Canvas {
HorizontalAlignment = HorizontalAlignment.Stretch
};
if (state == null)
{
return(canvas);
}
double position = state.Position;
double topOffset = Height / 2 - itemHeight * position;
int firstVisibleChildIdx = IntegerUtils.Clamp(
(int)Math.Floor(-(itemHeight + topOffset) / itemHeight),
0, state.Items.Count);
int lastVisibleChildIdx = IntegerUtils.Clamp(
(int)Math.Ceiling((Height - topOffset) / itemHeight),
0, state.Items.Count - 1);
for (int childIdx = firstVisibleChildIdx; childIdx <= lastVisibleChildIdx; ++childIdx)
{
var item = state.Items[childIdx];
var childElem = CreateItem(item);
canvas.Children.Add(childElem);
Canvas.SetTop(childElem, topOffset + itemHeight * childIdx);
childElem.Width = Width;
}
return(canvas);
}
