/// <summary>
/// Mark areas by drag.
/// </summary>
/// <param name="keys">Keys.</param>
/// <param name="n">Number of targets.</param>
/// <param name="eventHandler">Event handler.</param>
/// <param name="getState">Callback to get a target state.</param>
private static void Mark(Keys[] keys, int n, TargetMarkEventHandler eventHandler, Func <TargetStateByDrag> getState)
{
if (n <= 0)
{
throw new ArgumentException($"Invalid n: {n}");
}
lock (stateLocker) {
if (state != null)
{
throw new InvalidOperationException("Already marking a target by drag");
}
state = getState();
}
string eventName = $"{nameof(TargetMarkerByDrag)}.drag";
if (keys == null)
{
keys = defaultKeys;
}
EventDispatcher.KeyDown(
$"{eventName}.start", keys, (e) => {
state.UpdateArea(e.State.Mouse.Position);
}, forSystem: true
);
EventDispatcher.KeyUp(
$"{eventName}.end", keys, (e) => {
if (!state.Next())
{
EventDispatcher.Unlisten(eventName, forSystem: true);
TargetMarkEventArgs eventArgs = new TargetMarkEventArgs(state.GetTargets());
state = null;
eventHandler(eventArgs);
}
}, forSystem: true
);
}
/// <summary>
/// Mark areas by drag with multiple border widths and colors.
/// </summary>
/// <param name="eventHandler">Event handler.</param>
/// <param name="keys">Keys.</param>
/// <param name="n">Number of targets.</param>
/// <param name="borderWidths">Border widths.</param>
/// <param name="borderColors">Border colors.</param>
public static void MarkByDrag(TargetMarkEventHandler eventHandler, Keys[] keys = null, int n = 1, int[] borderWidths = null, Color[] borderColors = null)
{
TargetMarkerByDrag.Mark(keys, n, eventHandler, borderWidths, borderColors);
}
/// <summary>
/// Mark areas by drag with multiple border widths and colors.
/// </summary>
/// <param name="keys">Keys.</param>
/// <param name="n">Number of targets.</param>
/// <param name="eventHandler">Event handler.</param>
/// <param name="borderWidths">Border widths.</param>
/// <param name="borderColors">Border colors.</param>
public static void Mark(Keys[] keys, int n, TargetMarkEventHandler eventHandler, int[] borderWidths, Color[] borderColors)
{
Mark(keys, n, eventHandler, () => { return(new TargetStateByDrag(n, borderWidths, borderColors)); });
}