private void TrackResizePreview(SplitterGrip grip, double horizontalChange, double verticalChange)
{
int gripIndex;
int resizeIndex1;
int resizeIndex2;
if (!this.GetResizeIndices(grip, out gripIndex, out resizeIndex1, out resizeIndex2))
{
return;
}
double pixelAmount = this.Orientation == Orientation.Horizontal ? horizontalChange : verticalChange;
IList <SplitterMeasureData> splitterMeasureDataList = SplitterMeasureData.FromElements((IList)this.InternalChildren);
this.ResizeChildrenCore(splitterMeasureDataList[resizeIndex1], splitterMeasureDataList[resizeIndex2], pixelAmount);
SplitterPanel.Measure(this.RenderSize, this.Orientation, (IEnumerable <SplitterMeasureData>)splitterMeasureDataList, false);
Point point = grip.TransformToAncestor((Visual)this).Transform(new Point(0.0, 0.0));
if (this.Orientation == Orientation.Horizontal)
{
point.X += splitterMeasureDataList[gripIndex].MeasuredBounds.Width - this.InternalChildren[gripIndex].RenderSize.Width;
}
else
{
point.Y += splitterMeasureDataList[gripIndex].MeasuredBounds.Height - this.InternalChildren[gripIndex].RenderSize.Height;
}
Point screen = this.PointToScreen(point);
this.currentPreviewWindow.Move((double)(int)screen.X, (double)(int)screen.Y);
}
private void CommitResize(SplitterGrip grip, double horizontalChange, double verticalChange)
{
int gripIndex;
int resizeIndex1;
int resizeIndex2;
if (!this.GetResizeIndices(grip, out gripIndex, out resizeIndex1, out resizeIndex2))
{
return;
}
double pixelAmount = this.Orientation == Orientation.Horizontal ? horizontalChange : verticalChange;
this.ResizeChildren(resizeIndex1, resizeIndex2, pixelAmount);
}
private void OnSplitterResized(object sender, DragDeltaEventArgs args)
{
SplitterGrip grip = sender as SplitterGrip;
if (grip == null)
{
return;
}
args.Handled = true;
if (this.IsShowingResizePreview)
{
this.TrackResizePreview(grip, args.HorizontalChange, args.VerticalChange);
}
else
{
this.CommitResize(grip, args.HorizontalChange, args.VerticalChange);
}
}
private void OnSplitterDragStarted(object sender, DragStartedEventArgs args)
{
SplitterGrip originalSource = args.OriginalSource as SplitterGrip;
if (originalSource == null)
{
return;
}
args.Handled = true;
originalSource.DragDelta += new DragDeltaEventHandler(this.OnSplitterResized);
originalSource.DragCompleted += new DragCompletedEventHandler(this.OnSplitterDragCompleted);
if (!this.ShowResizePreview)
{
return;
}
this.currentPreviewWindow = new SplitterResizePreviewWindow();
this.currentPreviewWindow.Show((UIElement)originalSource);
}
private bool GetResizeIndices(SplitterGrip grip, out int gripIndex, out int resizeIndex1, out int resizeIndex2)
{
for (int index = 0; index < this.InternalChildren.Count; ++index)
{
if (this.InternalChildren[index].IsAncestorOf((DependencyObject)grip))
{
gripIndex = index;
switch (grip.ResizeBehavior)
{
case GridResizeBehavior.CurrentAndNext:
resizeIndex1 = index;
resizeIndex2 = index + 1;
break;
case GridResizeBehavior.PreviousAndCurrent:
resizeIndex1 = index - 1;
resizeIndex2 = index;
break;
case GridResizeBehavior.PreviousAndNext:
resizeIndex1 = index - 1;
resizeIndex2 = index + 1;
break;
default:
throw new InvalidOperationException("BasedOnAlignment is not a valid resize behavior");
}
if (resizeIndex1 >= 0 && resizeIndex2 >= 0 && resizeIndex1 < this.InternalChildren.Count)
{
return(resizeIndex2 < this.InternalChildren.Count);
}
return(false);
}
}
gripIndex = -1;
resizeIndex1 = -1;
resizeIndex2 = -1;
return(false);
}
private void OnSplitterDragCompleted(object sender, DragCompletedEventArgs args)
{
SplitterGrip grip = sender as SplitterGrip;
if (grip == null)
{
return;
}
args.Handled = true;
if (this.IsShowingResizePreview)
{
this.currentPreviewWindow.Hide();
this.currentPreviewWindow = (SplitterResizePreviewWindow)null;
if (!args.Canceled)
{
Point logicalUnits = new Point(args.HorizontalChange, args.VerticalChange).DeviceToLogicalUnits();
this.CommitResize(grip, logicalUnits.X, logicalUnits.Y);
}
}
grip.DragDelta -= new DragDeltaEventHandler(this.OnSplitterResized);
grip.DragCompleted -= new DragCompletedEventHandler(this.OnSplitterDragCompleted);
}
