/// <summary>
/// Updates site controls UI position in parent Grid panel based on the
/// location of data bound widget data object within its parent widget container.
/// </summary>
/// <remarks>
/// Widget data model consists of widget data objects which represent individual widgets
/// and widget container objects which represent a 2D matrix of widgets. On the UI side
/// widget containers are bound to source properties of WidgetMatrix controls which in
/// turn create children WidgetSiteControl controls whose source is then bound to
/// corresponding widget data objects.
///
/// If parent widget container is resized, locations of widgets in the UI may need to
/// be updated. The purpose of this method is to perform such an update to ensure the UI
/// remains consistent with its underlying data model.
/// </remarks>
public void UpdateGridPosition()
{
MatrixLoc gridPosition = ParentContainer.Source.Bounds.ToIndex(_location);
SetValue(Grid.RowProperty, gridPosition.Row);
SetValue(Grid.ColumnProperty, gridPosition.Column);
}
/// <summary>
/// Initializing constructor
/// </summary>
/// <param name="action">Specifies if a widget was added, removed or replaced</param>
/// <param name="location">Location of the changed widget</param>
/// <param name="oldWidget">Reference to the original widget, or null if there wasn't any</param>
/// <param name="newWidget">Reference to the new widget, or null if there isn't any</param>
public WidgetContainerChangedEventArgs( NotifyCollectionChangedAction action,
MatrixLoc location,
WidgetData oldWidget,
WidgetData newWidget )
{
_location = location;
_action = action;
_oldWidget = oldWidget;
_newWidget = newWidget;
}
private void UpdateMatrixUI(MatrixLoc insertLoc, WidgetSiteDragDropData data)
{
List <SiteShiftInfo> relocatedSites;
relocatedSites = CalculateWhichSitesToShift(insertLoc, data);
var sitesToMove = relocatedSites.Except(_prevRelocatedSites, SiteShiftInfoComparer.Comparer).ToList();
var sitesToReverse = _prevRelocatedSites.Except(relocatedSites, SiteShiftInfoComparer.Comparer).ToList();
foreach (var s in sitesToMove)
{
AnimateSiteTranslate(s.site, s.translateX, s.translateY);
}
foreach (var s in sitesToReverse)
{
AnimateSiteTranslate(s.site, 0.0, 0.0);
}
_prevRelocatedSites = relocatedSites;
}
private WidgetSiteControl CreateWidgetSite(MatrixLoc location, bool withAnimation, ref TimeSpan animationTime)
{
var site = new WidgetSiteControl();
var transform = new TransformGroup();
transform.Children.Add(withAnimation ? new ScaleTransform(0, 0) : new ScaleTransform(1, 1));
transform.Children.Add(new TranslateTransform());
site.RenderTransform = transform;
site.RenderTransformOrigin = new Point(0.5, 0.5);
if (withAnimation)
{
AnimateSiteScaleTransform(site, ref animationTime, 0, 1, null);
}
matrixPanel.Children.Add(site);
site.Location = location;
return(site);
}
private bool ProcessDataObject(DragEventArgs eventArgs, ProcessDataObjectDelegate callback)
{
WidgetSiteDragDropData data = eventArgs.Data.GetData("Droppy.WidgetSiteDragDropData") as WidgetSiteDragDropData;
if (data == null)
{
eventArgs.Effects = DragDropEffects.None;
return(false);
}
Point pt = eventArgs.GetPosition(this.Target) -
new Vector(data.DraggableOffset.X, data.DraggableOffset.Y);
Rect dragRect = new Rect(pt, new Size(data.Site.ActualWidth + data.Site.Margin.Width(),
data.Site.ActualHeight + data.Site.Margin.Height()));
Point dragCenter = new Point(dragRect.X + dragRect.Width / 2,
dragRect.Y + dragRect.Height / 2);
MatrixLoc insertIndex = new MatrixLoc(
(int)((dragCenter.Y + dragRect.Height) / dragRect.Height) - 1,
(int)((dragCenter.X + dragRect.Width) / dragRect.Width) - 1);
MatrixLoc insertLoc = _controlData.Source.Bounds.ToLocation(insertIndex);
if (_controlData.Source.Bounds.Contains(insertLoc))
{
eventArgs.Effects = DragDropEffects.Move;
callback(insertLoc, data);
}
else
{
eventArgs.Effects = DragDropEffects.None;
}
return(true);
}
private void CommitMove(MatrixLoc insertLoc, WidgetSiteDragDropData data)
{
List <SiteShiftInfo> relocatedSites;
relocatedSites = CalculateWhichSitesToShift(insertLoc, data);
if (relocatedSites.Count > 0)
{
foreach (var s in relocatedSites)
{
_controlData.Source[s.newLocation] = s.widget;
AnimateTranslate(s.site, TranslateTransform.XProperty, null);
AnimateTranslate(s.site, TranslateTransform.YProperty, null);
}
_controlData.Source[insertLoc] = data.Widget;
}
// If there are any controls left out of original position, return them now.
_prevRelocatedSites = _prevRelocatedSites.Except(relocatedSites, SiteShiftInfoComparer.Comparer).ToList();
CancelMove();
}
/// <summary>
/// Sets parent container information on the current widget
/// </summary>
/// <param name="parent">Reference to the parent widget container</param>
/// <param name="location">Location of the widget within the parent container</param>
public void SetOwner( WidgetContainerData parent, MatrixLoc location )
{
_location = location;
_parent = parent;
}
/// <summary>
/// Removes any association between the widget and its parent
/// </summary>
public void ClearOwner()
{
_parent = null;
_location = new MatrixLoc();
}
private void SetWidget( MatrixLoc location, WidgetData widget )
{
WidgetData removedWidget = null;
Validate();
// the same widget is being inserted at the same spot where it is already located,
// let not do anything and just exit
if( widget != null && widget.Parent == this && widget.Location == location ) return;
MatrixRect neededBounds = _containerBounds.GrowTo( location );
// If the cell being modified within the bounds of the current array, let's make sure
// the existing cell is empty. Otherwise, we need to reallocate the array before
// we can assign the widget to it.
if( neededBounds.Size == _containerBounds.Size )
{
removedWidget = ClearWidget( location );
}
else if( widget != null )
{
WidgetContainerResizeJustify resizeJustify =
( _containerBounds.Row == neededBounds.Row ?
WidgetContainerResizeJustify.Top : WidgetContainerResizeJustify.Bottom ) |
( _containerBounds.Column == neededBounds.Column ?
WidgetContainerResizeJustify.Left : WidgetContainerResizeJustify.Right );
Resize( neededBounds.Size, resizeJustify );
}
Validate();
if( widget != null )
{
if( widget.HasOwner )
{
widget.Parent.Remove( widget );
}
_widgetArray[ _containerBounds.ToIndex( location ) ] = widget;
widget.SetOwner( this, location );
widget.IsDirtyChanged += OnChildIsDirtyChanged;
if( removedWidget != null )
{
OnWidgetReplaced( location, removedWidget, widget );
removedWidget = null;
}
else
{
OnWidgetAdded( location, widget );
}
}
if( removedWidget != null )
{
OnWidgetRemoved( location, removedWidget );
}
Validate();
IsDirty = true;
}
private WidgetData ClearWidget( MatrixLoc loc )
{
MatrixLoc arrayIndex = _containerBounds.ToIndex( loc );
WidgetData widget = _widgetArray[ arrayIndex ];
_widgetArray[ arrayIndex ] = null;
if( widget != null )
{
widget.ClearOwner();
widget.IsDirtyChanged -= OnChildIsDirtyChanged;
}
return widget;
}
/// <summary>
/// This method is invoked whenever a widget is replaced
/// </summary>
/// <param name="location">Location where a widget was replaced</param>
/// <param name="oldWidget">Reference to an old widget that was replaced</param>
/// <param name="newWidget">Reference to a new widget that is being inserted</param>
protected virtual void OnWidgetReplaced( MatrixLoc location, WidgetData oldWidget, WidgetData newWidget )
{
if( _containerChangedEvent != null )
{
_containerChangedEvent( this, new WidgetContainerChangedEventArgs(
NotifyCollectionChangedAction.Replace, location, oldWidget, newWidget ) );
}
}
/// <summary>
/// This method is invoked whenever a widget is added
/// </summary>
/// <param name="location">Location where new widget was added</param>
/// <param name="widget">Reference to a widget that was added</param>
protected virtual void OnWidgetAdded( MatrixLoc location, WidgetData widget )
{
if( _containerChangedEvent != null )
{
_containerChangedEvent( this, new WidgetContainerChangedEventArgs(
NotifyCollectionChangedAction.Add, location, null, widget ) );
}
}
/// <summary>
/// Gets/sets a widget at a specified location in the container
/// </summary>
/// <param name="location">Location to access/modify</param>
public WidgetData this[MatrixLoc location]
{
get { return _widgetArray[ _containerBounds.ToIndex( location ) ]; }
set { SetWidget( location, value ); }
}
private List <SiteShiftInfo> CalculateWhichSitesToShift(MatrixLoc insertLoc, WidgetSiteDragDropData data)
{
MatrixLoc sourceLoc = data.Site.Location;
List <SiteShiftInfo> relocatedSites;
int i, step;
double translateBy;
// preallocate enough so we don't need to worry about reallocations
relocatedSites = new List <SiteShiftInfo>(_controlData.Source.Bounds.RowCount +
_controlData.Source.Bounds.ColumnCount + 10);
if (insertLoc.Column != sourceLoc.Column)
{
translateBy = data.Site.ActualWidth + data.Site.Margin.Width();
if (insertLoc.Column < sourceLoc.Column)
{
step = 1;
}
else
{
step = -1;
translateBy = -translateBy;
}
for (i = insertLoc.Column; i != sourceLoc.Column; i += step)
{
MatrixLoc arrayIndex = _controlData.Source.Bounds.ToIndex(new MatrixLoc(sourceLoc.Row, i));
WidgetSiteControl ctrl = _controlData.SiteGrid[arrayIndex];
relocatedSites.Add(new SiteShiftInfo()
{
site = ctrl, widget = (Data.WidgetData)ctrl.Content,
translateX = translateBy, translateY = 0.0,
newLocation = new MatrixLoc(sourceLoc.Row, i + step)
});
}
}
if (insertLoc.Row != sourceLoc.Row)
{
translateBy = data.Site.ActualHeight + data.Site.Margin.Height();
if (insertLoc.Row < sourceLoc.Row)
{
step = 1;
}
else
{
step = -1;
translateBy = -translateBy;
}
for (i = insertLoc.Row; i != sourceLoc.Row; i += step)
{
MatrixLoc arrayIndex = _controlData.Source.Bounds.ToIndex(new MatrixLoc(i, insertLoc.Column));
WidgetSiteControl ctrl = _controlData.SiteGrid[arrayIndex];
relocatedSites.Add(new SiteShiftInfo()
{
site = ctrl, widget = (Data.WidgetData)ctrl.Content,
translateY = translateBy, translateX = 0.0,
newLocation = new MatrixLoc(i + step, insertLoc.Column)
});
}
}
return(relocatedSites);
}
private void UpdateGrid(bool withAnimation)
{
TimeSpan animationTime = new TimeSpan();
List <WidgetSiteControl> sitesToRemove = new List <WidgetSiteControl>(256);
int rowCount = _controlData.Source.Bounds.RowCount;
int columnCount = _controlData.Source.Bounds.ColumnCount;
ResizeRowOrColumn(matrixPanel.RowDefinitions, rowCount);
ResizeRowOrColumn(matrixPanel.ColumnDefinitions, columnCount);
_controlData.SiteGrid = new Array2D <WidgetSiteControl>(rowCount, columnCount);
foreach (var child in matrixPanel.Children)
{
WidgetSiteControl site = child as WidgetSiteControl;
if (site == null)
{
continue;
}
if (!_controlData.Source.Bounds.Contains(site.Location))
{
if (withAnimation)
{
MatrixSize siteDistance = _controlData.Source.Bounds.Distance(site.Location);
TranslateTransform transform = (TranslateTransform)((TransformGroup)site.RenderTransform).Children[1];
transform.Y = site.HeightWithMargin * siteDistance.RowCount;
transform.X = site.WidthWithMargin * siteDistance.ColumnCount;
AnimateSiteScaleTransform(site, ref animationTime, 1, 0,
new EventHandler((o, e) => {
matrixPanel.Children.Remove(site);
}));
}
else
{
sitesToRemove.Add(site);
}
}
else
{
MatrixLoc arrayIndex = _controlData.Source.Bounds.ToIndex(site.Location);
_controlData.SiteGrid[arrayIndex] = site;
site.UpdateGridPosition();
}
}
foreach (var site in sitesToRemove)
{
matrixPanel.Children.Remove(site);
}
foreach (MatrixLoc loc in _controlData.Source.Bounds)
{
MatrixLoc arrayIndex = _controlData.Source.Bounds.ToIndex(loc);
if (_controlData.SiteGrid[arrayIndex] == null)
{
var site = CreateWidgetSite(loc, withAnimation, ref animationTime);
_controlData.SiteGrid[arrayIndex] = site;
}
_controlData.SiteGrid[arrayIndex].Content = _controlData.Source[loc];
}
}