/// <summary>
/// 设置界面的滑块的移动方式
/// </summary>
/// <param name="thumb">滑块</param>
/// <param name="e">事件对象</param>
/// <param name="lBorder">左边界</param>
/// <param name="rBorder">右边界</param>
private void OptionThumbDrug(Thumb thumb, DragDeltaEventArgs e, double lBorder, double rBorder)
{
double x = Canvas.GetLeft(thumb);
Canvas.SetLeft(thumb, x + e.HorizontalChange); //令thumb跟随鼠标移动
if (x < lBorder)
{
thumb.CancelDrag(); //删除thumb的鼠标捕获并触发DragComplete事件
Canvas.SetLeft(thumb, lBorder); //防止thumb停在界外，下同
}
if (x > rBorder)
{
thumb.CancelDrag();
Canvas.SetLeft(thumb, rBorder);
}
}
public void DefaultMethods()
{
Thumb t = new Thumb();
t.CancelDrag();
t.OnApplyTemplate();
ControlTest.CheckDefaultMethods(t);
}
private bool SetValueStartDrag(
Func <IInputElement, Point> getPosition,
Action <UIElement> captureDevice)
{
if (!_canDrag)
{
return(false);
}
try
{
_isDragStarting = true;
var originTrackPoint = getPosition(_track);
var newValue = _track.ValueFromPoint(originTrackPoint);
newValue = Math.Min(this.Maximum, Math.Max(this.Minimum, Math.Round(newValue)));
if (newValue == this.Value)
{
return(false);
}
// Set new value.
_updateValue.Invoke(this, new object[] { newValue });
}
finally
{
_isDragStarting = false;
}
// Reproduce Thumb.OnMouseLeftButtonDown method.
if (!_thumb.IsDragging)
{
// Start drag operation for Thumb.
_thumb.Focus();
captureDevice(_thumb);
_thumbIsDragging.SetValue(_thumb, true);
var originThumbPoint = getPosition(_thumb);
var originThumbPointToScreen = _thumb.PointToScreen(originThumbPoint);
//_thumbOriginThumbPoint.SetValue(_thumb, originThumbPoint);
_thumbPreviousScreenCoordPosition.SetValue(_thumb, originThumbPointToScreen);
_thumbOriginScreenCoordPosition.SetValue(_thumb, originThumbPointToScreen);
try
{
_thumb.RaiseEvent(new DragStartedEventArgs(originThumbPoint.X, originThumbPoint.Y));
}
catch
{
_thumb.CancelDrag();
throw;
}
}
return(true);
}
protected virtual bool SetValueStartDrag(
Func <IInputElement, Point> getPosition,
Action <UIElement> captureDevice)
{
if (!CanDrag)
{
return(false);
}
if (!this.IsFocused)
{
this.Focus();
}
var originTrackPoint = getPosition(_track);
var newValue = _track.ValueFromPoint(originTrackPoint);
if (UpdateValue(newValue))
{
return(false);
}
// Reproduce Thumb.OnMouseLeftButtonDown method.
if (!_thumb.IsDragging)
{
// Start drag operation for Thumb.
_thumb.Focus();
captureDevice(_thumb);
_thumbIsDragging.SetValue(_thumb, true);
var originThumbPoint = getPosition(_thumb);
var originThumbPointToScreen = _thumb.PointToScreen(originThumbPoint);
//_thumbOriginThumbPoint.SetValue(_thumb, originThumbPoint);
_thumbPreviousScreenCoordPosition.SetValue(_thumb, originThumbPointToScreen);
_thumbOriginScreenCoordPosition.SetValue(_thumb, originThumbPointToScreen);
try
{
// Trigger Thumb.DragStartedEvent event.
_thumb.RaiseEvent(new DragStartedEventArgs(originThumbPoint.X, originThumbPoint.Y));
}
catch
{
_thumb.CancelDrag();
throw;
}
}
return(true);
}
public void Events()
{
Thumb t = new Thumb();
t.DragStarted += delegate(object sender, DragStartedEventArgs e) {
throw new InvalidOperationException("DragStarted");
};
t.DragDelta += delegate(object sender, DragDeltaEventArgs e) {
throw new InvalidOperationException("DragDelta");
};
t.DragCompleted += delegate(object sender, DragCompletedEventArgs e) {
throw new InvalidOperationException("DragCompleted");
};
t.CancelDrag();
}
/// <summary>
/// Cancels the active scrub
/// </summary>
public void CancelScrub()
{
if (pointerCaptured)
{
pointerReleaseAction();
pointerReleaseAction = null;
pointerCaptured = false;
}
else if (Thumb.IsDragging)
{
Thumb.CancelDrag();
#if SILVERLIGHT
Thumb.ReleaseMouseCapture();
#else
Thumb.ReleasePointerCaptures();
#endif
}
UpdateScrubbingVisualState();
}
private void FixScrollView()
{
// the file uploader is used in windowless mode (to avoid overlap issues, and make it display correctly in firefox
// when initially hiding it in a display:none div), so need to do some code to fix mouse capture issues
FrameworkElement fe = VisualTreeHelper.GetChild(fileUploader.ScrollViewer, 0) as FrameworkElement;
if (fe != null)
{
//find the vertical scrollbar
ScrollBar sb = fe.FindName("VerticalScrollBar") as ScrollBar; if (sb != null)
{
//Get the scrollbar's thumbnail. This is the sucker that remains stuck in the "drag" state
Thumb thumb = ((FrameworkElement)VisualTreeHelper.GetChild(sb, 0)).FindName("VerticalThumb") as Thumb;
//cancel the operation
thumb.CancelDrag();
}
}
}
private void HandleRotate(object sender, DragDeltaEventArgs e)
{
Point pos = Mouse.GetPosition(AdornedElement);
double rotationAngle = GetAngle(_rotationCenter, pos);
var difference = rotationAngle - _rotateTransform.Angle;
if (_vm.IsRotateable(difference, _rotationCenter))
{
_rotationAngle = GetAngle(_rotationCenter, pos);
_rotateTransform.Angle = _rotationAngle;
_reverseRotateTransform.Angle = -_rotationAngle;
_vm.RotateSelectedItems(difference, _rotationCenter);
}
else
{
_rotate.CancelDrag();
}
}