private void ChangeState(bool collapse)
{
if (_isAnimating || _isChanging)
{
return;
}
DefinitionBase definition = GetDefinition();
if (definition == null)
{
return;
}
var byRow = _gridCollapseDirection == GridCollapseOrientation.Rows;
var actionProp = byRow ? RowDefinition.HeightProperty : ColumnDefinition.WidthProperty;
double curVal = ActualValue(definition);
if (collapse)
{
if (curVal == 0)
{
return;
}
_savedGridLength = byRow ? (definition as RowDefinition).Height : (definition as ColumnDefinition).Width;
_savedActualValue = curVal;
// Collapse
if (IsAnimated)
{
AnimateCollapse(definition);
}
else
{
definition.SetValue(actionProp, new GridLength(0));
}
// Raise the Collapsed event.
OnCollapsed(EventArgs.Empty);
}
else
{
if (_savedActualValue == 0 || curVal == _savedActualValue)
{
return;
}
// Expand
if (IsAnimated)
{
AnimateExpand(definition);
}
else
{
definition.SetValue(actionProp, _savedGridLength);
}
// Raise the Expanded event.
OnExpanded(EventArgs.Empty);
}
// Activate the background so the splitter can be dragged again.
_elementGridExpanderBackground.IsHitTestVisible = !collapse;
}
public static void GridSplitterOpeningBounce(this DefinitionBase rowColDefinition, bool opening = false, int openToSize = 0, Action <bool> afterCompleted = null)
{
if (rowColDefinition == null)
{
return; //for when events fire before everything is initialized
}
var isRow = (rowColDefinition.GetType() == typeof(RowDefinition));
Storyboard story;
if (!GridSplitterPositions.TryGetValue(rowColDefinition, out story))
{
var animation = new GridLengthAnimation {
To = new GridLength(openToSize), Duration = new TimeSpan(0, 0, 1)
};
Storyboard.SetTarget(animation, rowColDefinition);
Storyboard.SetTargetProperty(animation, new PropertyPath(isRow ? "Height" : "Width"));
GridSplitterPositions[rowColDefinition] = story = new Storyboard();
story.Children.Add(animation);
if (afterCompleted != null)
{
story.Completed += (s, e) => afterCompleted(opening);
}
}
var currentPositionProperty = isRow ? RowDefinition.HeightProperty : ColumnDefinition.WidthProperty;
if (opening)
{
//only bugger with popping open if not already opened by user
if (((GridLength)rowColDefinition.GetValue(currentPositionProperty)).Value <= 0.0)
{
story.Begin();
}
}
else
{
story.Stop();
//save the current position in the animation's "To" property so it opens back to where it was before we closed it
var current = (GridLength)rowColDefinition.GetValue(currentPositionProperty);
if (current.GridUnitType != GridUnitType.Star && current.Value > 0)
{
((GridLengthAnimation)story.Children[0]).To = current;
}
rowColDefinition.SetValue(currentPositionProperty, new GridLength(0, GridUnitType.Pixel));
}
}
public static void GridSplitterOpeningBounce(DefinitionBase RowColDefinition, int InitialSize, bool Opening)
{
if (RowColDefinition == null)
{
return; //for when events fire before everything is initialized
}
bool IsRow = (RowColDefinition.GetType() == typeof(RowDefinition));
Storyboard story;
if (!GridSplitterPositions.TryGetValue(RowColDefinition, out story))
{
GridLengthAnimation animation = new GridLengthAnimation();
animation.To = new GridLength(InitialSize);
animation.Duration = new TimeSpan(0, 0, 1);
Storyboard.SetTarget(animation, RowColDefinition);
Storyboard.SetTargetProperty(animation, new PropertyPath(IsRow ? "Height" : "Width"));
GridSplitterPositions[RowColDefinition] = story = new Storyboard();
story.Children.Add(animation);
}
if (Opening)
{
story.Begin();
}
else
{
story.Stop();
DependencyProperty CurrentPositionProperty = IsRow ? RowDefinition.HeightProperty : ColumnDefinition.WidthProperty;
//save the current position in the animation's "To" property so it opens back to where it was before we closed it
(story.Children[0] as GridLengthAnimation).To = (GridLength)RowColDefinition.GetValue(CurrentPositionProperty);
RowColDefinition.SetValue(CurrentPositionProperty, new GridLength(0, GridUnitType.Pixel));
}
}
private static void SetDefinitionLength(DefinitionBase definition, GridLength length)
{
definition.SetValue((definition is ColumnDefinition) ? ColumnDefinition.WidthProperty : RowDefinition.HeightProperty, length);
}
private void SetDefinitionLength(DefinitionBase definition, GridLength length)
{
definition.SetValue(definition is ColumnDefinition ? ColumnDefinition.WidthProperty : RowDefinition.HeightProperty, (object)length);
}
private static void SetIsAuto(this DefinitionBase element, bool value)
{
element.SetValue(IsAutoProperty, BooleanBoxes.Box(value));
}