private void RemoveGradientStop(GradientThumb toRemoveThumb)
{
if (toRemoveThumb == null || !(toRemoveThumb.Tag is double) || !(toRemoveThumb.Parent is Canvas))
{
return;
}
var offsetTag = (double)toRemoveThumb.Tag;
var linebrush = GradientBorder.Background as LinearGradientBrush;
var removeTag = linebrush.GradientStops.FirstOrDefault(x => x.Offset == offsetTag);
if (removeTag != null)
{
linebrush.GradientStops.Remove(removeTag);
}
var canvas = toRemoveThumb.Parent as Canvas;
//canvas.Children.Remove(toRemoveThumb);
toRemoveThumb.Opacity = 0d;
var rtnStyle = new StyleColor();
rtnStyle.FillType = ColorFillType.Gradient;
rtnStyle.Frames = new Dictionary <double, int>();
foreach (var gs in linebrush.GradientStops)
{
rtnStyle.Frames.Add(gs.Offset, gs.Color.ToArgb());
}
CurrentStyle = rtnStyle;
}
protected virtual void OnInitialColorChanged(StyleColor oldInitialColor, StyleColor newInitialColor)
{
if (!(GradientBorder.Background is LinearGradientBrush))
{
return;
}
var linebrush = GradientBorder.Background as LinearGradientBrush;
linebrush.GradientStops.Clear();
var newFrames = newInitialColor.Frames;
if (newFrames == null || newFrames.Count == 0)
{
newFrames = new Dictionary <double, int>();
newFrames[0] = -1;
newFrames[1] = -16777216;
}
var parentCanvas = this.canvas;
parentCanvas.Children.Clear();
var actualWidth = parentCanvas.ActualWidth;
foreach (var keypair in newFrames)
{
var gradientThumb = new GradientThumb
{
Template = this.Resources["GradientThumbTemplate"] as ControlTemplate,
Tag = keypair.Key
};
gradientThumb.DragDelta += gradientThumb_DragDelta;
gradientThumb.MouseClicked += gradientThumb_MouseDown;
gradientThumb.ThumbRemoving += gradientThumb_ThumbRemoving;
gradientThumb.ThumbRecovering += gradientThumb_ThumbRecovering;
gradientThumb.ThumbRemoved += gradientThumb_ThumbRemoved;
Canvas.SetLeft(gradientThumb, keypair.Key * actualWidth);
parentCanvas.Children.Add(gradientThumb);
var drawingColor = System.Drawing.Color.FromArgb(keypair.Value);
gradientThumb.SetColor(Color.FromArgb(drawingColor.A, drawingColor.R, drawingColor.G, drawingColor.B));
var gradientStop = new GradientStop(
Color.FromArgb(drawingColor.A, drawingColor.R, drawingColor.G, drawingColor.B),
keypair.Key);
linebrush.GradientStops.Add(gradientStop);
}
this.selectedThumb = parentCanvas.Children[0] as GradientThumb;
this.selectedThumb.SetSelected(true);
this.SelectedColor = linebrush.GradientStops[0].Color;
CurrentStyle = newInitialColor;
}
private void SetThumbSeletected(GradientThumb sthumb)
{
var parentCanvas = this.canvas;
foreach (var thumb in parentCanvas.Children.OfType <GradientThumb>())
{
if (thumb == sthumb)
{
thumb.SetSelected(true);
this.selectedThumb = thumb;
this.SelectedColor = thumb.GetColor();
}
else
{
thumb.SetSelected(false);
}
}
}
void gradientThumb_ThumbRemoved(object sender, EventArgs e)
{
var thumb = sender as GradientThumb;
if (thumb == null || !(thumb.Parent is Canvas))
{
return;
}
var canvas = thumb.Parent as Canvas;
canvas.Children.Remove(thumb);
var toSelectedThumb = canvas.Children.OfType <GradientThumb>().OrderBy(x => x.Tag is double?(double)x.Tag: double.MaxValue).FirstOrDefault();
if (toSelectedThumb != null)
{
this.selectedThumb = toSelectedThumb;
this.selectedThumb.SetSelected(true);
this.SelectedColor = this.selectedThumb.GetColor();
}
}
private void CanvasMouseDown(object sender, MouseButtonEventArgs e)
{
///暂时屏蔽多点渐变色
if (e.LeftButton == MouseButtonState.Pressed &&
e.RightButton == MouseButtonState.Released &&
sender is Canvas)
{
var canvas = sender as Canvas;
var mouseposition = e.GetPosition(canvas);
var newOffset = Math.Round(mouseposition.X / canvas.ActualWidth, 2);
var linebrush = GradientBorder.Background as LinearGradientBrush;
if (linebrush.GradientStops.Any(x => Math.Abs(x.Offset - newOffset) <= 0.05))
{
return;
}
var gradientThumb = new GradientThumb
{
Template = this.Resources["GradientThumbTemplate"] as ControlTemplate,
Tag = newOffset
};
gradientThumb.DragDelta += gradientThumb_DragDelta;
gradientThumb.MouseClicked += gradientThumb_MouseDown;
gradientThumb.ThumbRemoving += gradientThumb_ThumbRemoving;
gradientThumb.ThumbRecovering += gradientThumb_ThumbRecovering;
gradientThumb.ThumbRemoved += gradientThumb_ThumbRemoved;
Canvas.SetLeft(gradientThumb, newOffset * canvas.ActualWidth);
canvas.Children.Add(gradientThumb);
var relativeposition = new System.Windows.Point(
newOffset * GradientBorder.ActualWidth,
GradientBorder.ActualHeight / 2);
var screenposition = GradientBorder.PointToScreen(relativeposition);
var drawingColor = ColorPickerManager.GetColor((int)screenposition.X, (int)screenposition.Y);
gradientThumb.SetColor(Color.FromArgb(drawingColor.A, drawingColor.R, drawingColor.G, drawingColor.B));
var gradientStop = new GradientStop(
Color.FromArgb(drawingColor.A, drawingColor.R, drawingColor.G, drawingColor.B),
newOffset);
linebrush.GradientStops.Add(gradientStop);
foreach (var thumb in canvas.Children.OfType <GradientThumb>())
{
if (thumb == gradientThumb)
{
thumb.SetSelected(true);
this.selectedThumb = thumb;
}
else
{
thumb.SetSelected(false);
}
}
this.selectedThumb.SetSelected(true);
this.SelectedColor = drawingColor;
var rtnStyle = new StyleColor();
rtnStyle.FillType = ColorFillType.Gradient;
rtnStyle.Frames = new Dictionary <double, int>();
foreach (var gs in linebrush.GradientStops)
{
rtnStyle.Frames.Add(gs.Offset, gs.Color.ToArgb());
}
CurrentStyle = rtnStyle;
}
}
