/// <summary>
/// Creates a trackbar and attaches it to the window.
/// </summary>
/// <param name="trackbarName">Name of the created trackbar.</param>
/// <param name="value">A reference to an integer value that specifies the position of the slider.</param>
/// <param name="count">Maximal position of the slider. Minimal position is always 0.</param>
/// <param name="onChanged">
/// The callback method that will be called every time the slider changes position.
/// </param>
public void CreateTrackbar(string trackbarName, ref int value, int count, TrackbarCallback onChanged = null)
{
if (trackbars == null)
{
trackbars = new List <TrackbarCallback>();
}
if (onChanged != null)
{
trackbars.Add(onChanged);
}
NativeMethods.cvCreateTrackbar(trackbarName, name, ref value, count, onChanged);
}
/// <summary>
/// ウィンドウにトラックバーを作成し、作成したトラックバーを返す
/// </summary>
/// <param name="name">トラックバーの名前</param>
/// <param name="value">スライダの初期位置</param>
/// <param name="count">スライダの最大値．最小値は常に 0.</param>
/// <param name="onChange">スライダの位置が変更されるたびに呼び出されるデリゲート</param>
/// <returns></returns>
#else
/// <summary>
/// Creates the trackbar and attaches it to this window
/// </summary>
/// <param name="name">Name of created trackbar. </param>
/// <param name="value">The position of the slider</param>
/// <param name="count">Maximal position of the slider. Minimal position is always 0. </param>
/// <param name="onChange">the function to be called every time the slider changes the position. This function should be prototyped as void Foo(int);</param>
/// <returns></returns>
#endif
public TrackbarWithLabel CreateTrackbar(string name, int value, int count, TrackbarCallback onChange)
{
var t = new TrackbarWithLabel(name, value, count, 0);
t.Dock = DockStyle.Top;
t.Trackbar.ValueChanged += (o, e) =>
{
int pos = ((TrackBar)o).Value;
onChange(pos);
};
SetClientSize(new System.Drawing.Size(ClientSize.Width, ClientSize.Height + t.Height));
_panelTrackbar.Height += t.Height;
_panelTrackbar.Controls.Add(t);
return(t);
}
/// <summary>
/// 初期化
/// </summary>
/// <param name="name">トラックバーの名前</param>
/// <param name="window">トラックバーの親ウィンドウ名</param>
/// <param name="value">スライダの初期位置</param>
/// <param name="max">スライダの最大値．最小値は常に 0.</param>
/// <param name="callback">スライダの位置が変更されるたびに呼び出されるデリゲート</param>
#else
/// <summary>
/// Constructor
/// </summary>
/// <param name="trackbarName">Trackbar name</param>
/// <param name="windowName">Window name</param>
/// <param name="initialPos">Initial slider position</param>
/// <param name="max">The upper limit of the range this trackbar is working with. </param>
/// <param name="callback">Callback handler</param>
#endif
internal CvTrackbar(string trackbarName, string windowName, int initialPos, int max, TrackbarCallback callback)
{
if (string.IsNullOrEmpty(trackbarName))
{
throw new ArgumentNullException(nameof(trackbarName));
}
if (string.IsNullOrEmpty(windowName))
{
throw new ArgumentNullException(nameof(windowName));
}
this.callback = callback ?? throw new ArgumentNullException(nameof(callback));
TrackbarName = trackbarName;
WindowName = windowName;
// userData wrapper
callbackNative = (pos, ud) => callback(pos);
gchCallback = GCHandle.Alloc(callback);
gchCallbackNative = GCHandle.Alloc(callbackNative);
var callbackPtr = Marshal.GetFunctionPointerForDelegate(callbackNative);
NativeMethods.HandleException(
NativeMethods.highgui_createTrackbar(
trackbarName, windowName, IntPtr.Zero, max, callbackPtr, IntPtr.Zero, out result));
// Set initial trackbar position
NativeMethods.HandleException(
NativeMethods.highgui_setTrackbarPos(
trackbarName, windowName, initialPos));
if (result == 0)
{
throw new OpenCvSharpException("Failed to create CvTrackbar.");
}
}
/// <summary>
/// 初期化(目盛りは0~100)
/// </summary>
/// <param name="name">トラックバーの名前</param>
/// <param name="window">トラックバーの親ウィンドウ名</param>
/// <param name="callback">スライダの位置が変更されるたびに呼び出されるデリゲート</param>
#else
/// <summary>
/// Constructor (value=0, max=100)
/// </summary>
/// <param name="name">Trackbar name</param>
/// <param name="window">Window name</param>
/// <param name="callback">Callback handler</param>
#endif
internal CvTrackbar(string name, string window, TrackbarCallback callback)
: this(name, window, 0, 100, callback)
{
}
internal static extern int cvCreateTrackbar(
string trackbar_name,
string window_name,
ref int value,
int count,
TrackbarCallback on_change);