///////////////////////////////////////////////////////////////////////////////
// Small helping Methods //
///////////////////////////////////////////////////////////////////////////////
#region HELPER
/// <summary>
/// Compares to markers and returns true, if they are at the same position.
/// </summary>
/// <param name="a">Marker 1</param>
/// <param name="b">Marker 2</param>
/// <returns>true if at the same place</returns>
private static int CompareMarkers(Marker a, Marker b)
{
return a.Position.CompareTo(b.Position);
}
///////////////////////////////////////////////////////////////////////////////
// Eventhandler for Custom Defined Events //
///////////////////////////////////////////////////////////////////////////////
#region CUSTOMEVENTHANDLER
/// <summary>
/// Raised, when a marker is selected. Updates UI fields with marker values.
/// </summary>
/// <param name="sender">marker that is selected</param>
/// <param name="e">An empty <see cref="EventArgs"/></param>
private void gradientBuilder_MarkerSelected(object sender, EventArgs e)
{
Marker tempMarker = sender as Marker;
marker = null; // Freeze all other event handlers
if (tempMarker != null)
{
colorEditor.Value = tempMarker.Color;
opacityBox.Value = Convert.ToDecimal(tempMarker.Color.A * (100.0f / 255));
positionBox.Enabled = tempMarker.IsMovable;
positionBox.Value = (int)(tempMarker.Position * 100.0f);
grpEditor.Enabled = true;
}
else
grpEditor.Enabled = false;
marker = tempMarker;
}
/// <summary>
/// Override. If an location on the marker strip is double clicked where there
/// are no existing markers, a new marker is added.
/// </summary>
/// <param name="e"></param>
protected override void OnMouseDoubleClick(MouseEventArgs e)
{
Point pt = new Point(e.X, e.Y);
if (gradBarRect.Contains(pt))
{
int i = 0;
for (; i < markers.Count; i++)
if (markers[i].Bounds.Contains(pt))
return;
else if (markers[i].Bounds.X > pt.X)
break;
float a, b;
a = (float)e.X - DEFAULT_PADDING;
b = (float)markerStrip.Width;
Marker newMarker = new Marker(a / b);
newMarker.UpdateBounds(compensatedMarkerStrip);
// Select the color for the new marker. It should be the current
// color of the gradient at the marker point.
if (this.gradientBmp != null)
newMarker.Color = gradientBmp.GetPixel(
(int)newMarker.Bounds.X, 0);
newMarker.MarkerUpdated += new EventHandler(marker_MarkerUpdated);
markers.Insert(i, newMarker);
// Notify that we have a new gradient
OnGradientChanged(false);
OnMarkerSelected(newMarker);
}
}
/// <summary>
/// Override. Updates gradient with changes.
/// </summary>
/// <param name="e">MouseEventArgs</param>
protected override void OnMouseUp(MouseEventArgs e)
{
this.Cursor = Cursors.Default;
if (movingMarker != null) // A movement was done. Resort the array
{
markers.Sort(CompareMarkers);
Invalidate(gradBarRect);
//selectedMarker = movingMarker;
//OnMarkerSelected(movingMarker);
if (!markerStrip.Contains(e.X, e.Y))
{
this.markers.Remove(movingMarker);
this.movingMarker = null;
}
// Notify that we have a new gradient
OnGradientChanged(false);
}
//else if (markers[0].Bounds.Contains(e.X, e.Y))
// OnMarkerSelected(markers[0]);
//else if (markers[markers.Count - 1].Bounds.Contains(e.X, e.Y))
// OnMarkerSelected(markers[markers.Count - 1]);
movingMarker = null;
}
/// <summary>
/// Override. Can a marker (other than the first or the last) receive this
/// mouse down event?
/// </summary>
/// <param name="e">MouseEventArgs</param>
protected override void OnMouseDown(MouseEventArgs e)
{
for (int i = 1; i < markers.Count - 1; i++)
if (markers[i].Bounds.Contains(e.X, e.Y))
{
movingMarker = markers[i];
break;
}
if (movingMarker != null)
{
selectedMarker = movingMarker;
OnMarkerSelected(movingMarker);
}
else
{
if (markers[0].Bounds.Contains(e.X, e.Y))
OnMarkerSelected(markers[0]);
else if (markers[markers.Count - 1].Bounds.Contains(e.X, e.Y))
OnMarkerSelected(markers[markers.Count - 1]);
}
Invalidate();
}
/// <summary>
/// Raises MarkerSelected event.
/// </summary>
/// <param name="selectedMarker">currently selected Marker</param>
protected virtual void OnMarkerSelected(Marker selectedMarker)
{
this.selectedMarker = selectedMarker;
Rectangle invalidRect = markerStrip;
invalidRect.Inflate((int)selectedMarker.Bounds.Width, 0);
this.Invalidate(invalidRect);
if (MarkerSelected != null)
MarkerSelected(selectedMarker, EventArgs.Empty);
}
///////////////////////////////////////////////////////////////////////////////
// Construction and Initializing methods //
///////////////////////////////////////////////////////////////////////////////
#region CONSTRUCTION
/// <summary>
/// Constructor. Initializes gradient builder control.
/// </summary>
public GradientBuilder()
{
SetStyle(ControlStyles.AllPaintingInWmPaint, true);
SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
SetStyle(ControlStyles.ResizeRedraw, true);
SetStyle(ControlStyles.UserPaint, true);
this.gradient = new Gradient();
this.gradient.GradientDirection = LinearGradientMode.Horizontal;
this.markers = new List<Marker>(2);
Marker startMarker, endMarker;
startMarker = new Marker(0.0f, Color.Black, false);
endMarker = new Marker(1.0f, Color.White, false);
markers.Add(startMarker);
markers.Add(endMarker);
startMarker.MarkerUpdated += new EventHandler(marker_MarkerUpdated);
endMarker.MarkerUpdated += new EventHandler(marker_MarkerUpdated);
}