private bool IsTileOnPageLeft(MetroStartPage targetPage, FrameworkElement tile)
{
var target = targetPage.MainContent != null ? targetPage.MainContent : targetPage;
Point tileLeft = tile.TransformToAncestor(target).Transform(new Point(0, 0));
return(tileLeft.X <= tile.Margin.Left);
}
private bool IsTileOnPageRight(MetroStartPage targetPage, FrameworkElement tile)
{
var target = targetPage.MainContent != null ? targetPage.MainContent : targetPage;
Point tileRight = tile.TransformToAncestor(target).Transform(new Point(tile.Width, tile.Height));
return(tileRight.X >= target.ActualWidth - tile.Margin.Left);
}
private bool IsTileOnPageBottom(MetroStartPage targetPage, FrameworkElement tile)
{
var target = targetPage.MainContent != null ? targetPage.MainContent : targetPage;
Point tileBottom = tile.TransformToAncestor(target).Transform(new Point(tile.Width, tile.Height));
return(tileBottom.Y >= target.ActualHeight - tile.Margin.Bottom);
}
private void CleanUpAfterDrag()
{
var window = Window.GetWindow(_MetroControl);
window.ClearValue(Window.AllowDropProperty);
window.DragEnter -= HandleDrag;
window.DragOver -= HandleDrag;
window.DragLeave -= HandleDrag;
window.Drop -= HandleDrop;
window.GiveFeedback -= HandleGiveFeedback;
VisualStateManager.GoToState(_DragTile, "IsNotDragSource", true);
if (_DragAdorner != null)
{
_DragAdorner.Detach();
}
if (_ScrollHelper != null)
{
_ScrollHelper.Stop();
}
_DragAdorner = null;
_DragSourcePage = null;
_DragTile = null;
_DragData = null;
_TileDropHelper = null;
_ScrollHelper = null;
_NewPageHelper = null;
}
private void ClearSpreadPageStates()
{
if (_SpreadPageLeft != null)
{
VisualStateManager.GoToState(_SpreadPageLeft, "NoSpread", true);
_SpreadPageLeft = null;
}
if (_SpreadPageRight != null)
{
VisualStateManager.GoToState(_SpreadPageRight, "NoSpread", true);
_SpreadPageRight = null;
}
}
public bool UpdateView(Point hitPoint, bool clear)
{
if (clear)
{
Clear();
return(false);
}
Point testPoint = _DragHelper.TranslateHitPoint(hitPoint, _DragHelper._MetroControlPanel);
_DropPage = _DragHelper._MetroControlPanel.HitTestForOne <MetroStartPage>(testPoint);
if (_DropPage == null)
{
Clear();
return(false);
}
SetDropTargetTiles(_DragHelper.TranslateHitPoint(hitPoint, _DropPage), _DropPage);
return(true);
}
private Dock GetHitSide(MetroStartPage targetPage, MetroTile hitTile, MetroTile dragTile, Point pos)
{
// For vertically oriented pages, if dragging a small tile and the hit tile is also small,
// treat as if horizontal oriented.
if (targetPage.Orientation == Orientation.Vertical && !(hitTile.Type == MetroTileType.Small && dragTile.Type == MetroTileType.Small))
{
double dY = (hitTile.RenderSize.Height / 2) - pos.Y;
if (dY > 0)
{
return(Dock.Top);
}
return(Dock.Bottom);
}
else
{
double dX = (hitTile.RenderSize.Width / 2) - pos.X;
if (dX > 0)
{
return(Dock.Left);
}
return(Dock.Right);
}
}
private void PrepareForDrag()
{
var window = Window.GetWindow(_MetroControl);
window.AllowDrop = true;
window.DragEnter += HandleDrag;
window.DragOver += HandleDrag;
window.DragLeave += HandleDrag;
window.Drop += HandleDrop;
window.GiveFeedback += HandleGiveFeedback;
if (_MetroControlPanel == null)
{
_MetroControlPanel = _MetroControl.GetItemsHost();
}
VisualStateManager.GoToState(_DragTile, "IsDragSource", true);
_DragSourcePage = _DragTile.GetVisualParent <MetroStartPage>();
_DragData = _DragSourcePage != null?_DragSourcePage.ItemContainerGenerator.ItemFromContainer(_DragTile) : null;
var adornerTemplate = (DataTemplate)_MetroControl.FindResource(MetroControl.DragAdornerDataTemplateKey);
_DragAdorner = new TemplatedDragDropAdorner(_MetroControl, adornerTemplate, _DragData);
_AdornerOffset = _MetroControl.TranslatePoint(_MouseDownPosition, _DragTile);
_CenterOffset = new Point();
_CenterOffset.Offset((_DragTile.RenderSize.Width / 2) - _AdornerOffset.X, (_DragTile.RenderSize.Height / 2) - _AdornerOffset.Y);
_TileDropHelper = new TileDropHelper(this);
_ScrollHelper = new AutoScrollHelper(this);
if (CanCreateNewPages())
{
_NewPageHelper = new DragTileIntoNewPageHelper(this);
}
}
private bool DoDrop()
{
if (_SpreadPageLeft == null && _SpreadPageRight == null)
{
return(false);
}
// Can't rely on Parent Items.Count...
int index = -1;
if (_SpreadPageRight != null)
{
index = _DragHelper._MetroControl.ItemContainerGenerator.IndexFromContainer(_SpreadPageRight);
}
object newPageItem = null;
if (_DragHelper._MetroControl.ItemsSource == null)
{
newPageItem = new MetroStartPage();
if (index >= 0)
{
_DragHelper._MetroControl.Items.Insert(index, newPageItem);
}
else
{
_DragHelper._MetroControl.Items.Add(newPageItem);
}
}
else
{
// Can't insert into Items when ItemsSource is in use. Made check when setting up
// MetroControl as drop target to ensure that the data type used for ItemsSource
// has a default constructor.
var pageDataType = _DragHelper._MetroControl.ItemContainerGenerator.ItemFromContainer(_DragHelper._DragSourcePage).GetType();
var constructor = pageDataType.GetConstructor(System.Type.EmptyTypes);
dynamic page = constructor.Invoke(null);
// Also made check that ItemsSource is a list, but it might be generic and might not be generic,
// so use dynamic here so it won't matter when making call to insert.
dynamic list = _DragHelper._MetroControl.ItemsSource;
if (index >= 0)
{
list.Insert(index, page);
}
else
{
list.Add(page);
}
newPageItem = page;
}
_DragHelper._DragSourcePage.RemoveItem(_DragHelper._DragData);
// Dispatch method call to add tile data to new page, so the new page has time to be created.
_DragHelper._MetroControl.Dispatcher.BeginInvoke(
new Action <MetroControl, object, object, int>(AddDraggedDataToNewPageDispatcherCallback),
DispatcherPriority.ApplicationIdle,
_DragHelper._MetroControl, newPageItem, _DragHelper._DragData, 0);
return(true);
}
private bool SpreadPages(Point hitPoint)
{
MetroStartPage pageLeft = null, pageRight = null;
bool doSearch = true;
var testPoint = _DragHelper.TranslateHitPoint(hitPoint, _DragHelper._MetroControlPanel);
if (testPoint.Y < 0 || testPoint.Y > _DragHelper._MetroControlPanel.ActualHeight)
{
doSearch = false;
}
var hitPage = _DragHelper._MetroControlPanel.HitTestForOne <MetroStartPage>(testPoint);
if (hitPage != null)
{
if (hitPage.MainContent != null)
{
var contentPos = _DragHelper.TranslateHitPoint(hitPoint, hitPage.MainContent);
if (contentPos.X < 0)
{
pageRight = hitPage;
}
else if (contentPos.X > hitPage.MainContent.ActualWidth)
{
pageLeft = hitPage;
}
}
}
if (doSearch)
{
int leftIndex = 0;
if (pageLeft != null)
{
leftIndex = _DragHelper._MetroControl.ItemContainerGenerator.IndexFromContainer(pageLeft) + 1;
}
int rightIndex = _DragHelper._MetroControl.Items.Count;
if (pageRight != null)
{
rightIndex = _DragHelper._MetroControl.ItemContainerGenerator.IndexFromContainer(pageRight);
}
for (int i = leftIndex; i < rightIndex; i++)
{
var page = _DragHelper._MetroControlPanel.Children[i] as MetroStartPage;
// Pages are separated by margins on grids defined in their templates. The
// grids don't have background set so drag events make it through. Here we're
// getting the visible portion of the page against which to test mouse position.
var visible = page.MainContent;
if (visible == null)
{
visible = page;
}
var hitPos = _DragHelper.TranslateHitPoint(hitPoint, visible);
if (visible.IsPointWithin(hitPos))
{
pageLeft = pageRight = null;
break;
}
else if (hitPos.X < 0)
{
pageRight = page;
break;
}
else if (hitPos.X > visible.ActualWidth)
{
pageLeft = page;
}
}
if (_DragHelper._DragSourcePage.Items.Count == 1 && (pageLeft == _DragHelper._DragSourcePage || pageRight == _DragHelper._DragSourcePage))
{
pageRight = pageLeft = null;
}
}
if (pageLeft != _SpreadPageLeft)
{
if (_SpreadPageLeft != null)
{
VisualStateManager.GoToState(_SpreadPageLeft, "NoSpread", true);
}
if (pageLeft != null)
{
VisualStateManager.GoToState(pageLeft, "SpreadLeft", true);
}
_SpreadPageLeft = pageLeft;
}
if (pageRight != _SpreadPageRight)
{
if (_SpreadPageRight != null)
{
VisualStateManager.GoToState(_SpreadPageRight, "NoSpread", true);
}
if (pageRight != null)
{
VisualStateManager.GoToState(pageRight, "SpreadRight", true);
}
_SpreadPageRight = pageRight;
}
return(pageLeft != null || pageRight != null);
}
private MetroTile FindSecondaryTargetTile(MetroStartPage targetPage, MetroTile targetTile, MetroTile dragTile, Dock hitSide, out int dropIndex)
{
int targetIndex = targetPage.ItemContainerGenerator.IndexFromContainer(targetTile);
dropIndex = targetIndex;
if (targetTile == _DragHelper._DragTile)
{
return(null);
}
int sourceIndex = targetPage.ItemContainerGenerator.IndexFromContainer(dragTile);
if (sourceIndex < 0)
{
sourceIndex = int.MaxValue;
}
int secondaryIndex = -1;
if (hitSide == Dock.Top)
{
if (!IsTileOnPageTop(targetPage, targetTile))
{
secondaryIndex = targetIndex - 1;
}
if (sourceIndex < targetIndex)
{
dropIndex--;
}
}
else if (hitSide == Dock.Bottom)
{
if (!IsTileOnPageBottom(targetPage, targetTile))
{
secondaryIndex = targetIndex + 1;
}
if (sourceIndex > targetIndex)
{
dropIndex++;
}
}
else if (hitSide == Dock.Left)
{
if (!IsTileOnPageLeft(targetPage, targetTile))
{
secondaryIndex = targetIndex - 1;
}
if (sourceIndex < targetIndex)
{
dropIndex--;
}
}
else if (hitSide == Dock.Right)
{
if (!IsTileOnPageRight(targetPage, targetTile))
{
secondaryIndex = targetIndex + 1;
}
if (sourceIndex > targetIndex)
{
dropIndex++;
}
}
MetroTile secondary = null;
if (secondaryIndex >= 0 && secondaryIndex < targetPage.Items.Count)
{
secondary = targetPage.ItemContainerGenerator.ContainerFromIndex(secondaryIndex) as MetroTile;
// special case handling for when dropping small tile into empty space beside another small tile,
// in this situation there should be no secondary.
if (secondary != null && secondary.Type != MetroTileType.Small && secondary != dragTile && targetTile.Type == MetroTileType.Small && dragTile.Type == MetroTileType.Small)
{
secondary = null;
}
}
return(secondary);
}
private void SetDropTargetTiles(Point position, MetroStartPage dropTargetPage)
{
var dragTile = _DragHelper._DragTile;
bool suppressAnimation = false;
MetroTile secondaryTarget = null, target2 = null, secondaryTarget2 = null;
var target = dropTargetPage.HitTestForOne <MetroTile>(position, _DragHelper._DragTile.Margin);
if (target == null && dragTile.Type == MetroTileType.Small)
{
target = dropTargetPage.HitTestForOne <MetroTile>(position, new Thickness(0, 0, dragTile.Width, 0));
if (target != null && target.Type == MetroTileType.Large)
{
target = null;
}
suppressAnimation = true;
}
Dock hitSide = Dock.Left;
if (target != null)
{
hitSide = GetHitSide(dropTargetPage, target, dragTile, dropTargetPage.TranslatePoint(position, target));
// If vertical orientation, and hitting a small tile, there might be another small tile beside it which also needs to be animated.
if (_DropPage.Orientation == Orientation.Vertical && target.Type == MetroTileType.Small && dragTile.Type == MetroTileType.Large)
{
int index, adjacentIndex;
target2 = FindAdjacentSmallTile(target, out index, out adjacentIndex);
if (target2 != null)
{
// Might need to switch target and target2 because target defines the insertion index.
if ((hitSide == Dock.Top && adjacentIndex < index) || (hitSide == Dock.Bottom && adjacentIndex > index))
{
var temp = target;
target = target2;
target2 = temp;
}
}
}
// Look for secondary drop target if not dropping onto self or not dropping one small tile onto another small tile.
secondaryTarget = FindSecondaryTargetTile(dropTargetPage, target, dragTile, hitSide, out _DropIndex);
if (secondaryTarget != null && _DropPage.Orientation == Orientation.Vertical && secondaryTarget.Type == MetroTileType.Small && dragTile.Type == MetroTileType.Large)
{
int index, adjacentIndex;
secondaryTarget2 = FindAdjacentSmallTile(secondaryTarget, out index, out adjacentIndex);
}
}
else
{
_DropIndex = _DropPage.Items.Count;
if (_DragHelper._DragSourcePage == _DropPage)
{
_DropIndex--;
}
}
if (!suppressAnimation)
{
UpdateDropTargetTiles(target, target2, secondaryTarget, secondaryTarget2, hitSide);
}
else
{
UpdateDropTargetTiles(null, null, null, null, Dock.Left);
}
}
