/// <summary>
/// Handles control's DragOver event.
/// </summary>
public void DragOver(DragEventArgs e)
{
if (mImageListView.AllowDrop || (mImageListView.AllowDrag && selfDragging))
{
if (mImageListView.Items.Count == 0)
{
if (selfDragging)
{
e.Effect = DragDropEffects.None;
}
else
{
e.Effect = DragDropEffects.Copy;
}
}
else
{
// Calculate the location of the insertion cursor
Point pt = new Point(e.X, e.Y);
pt = mImageListView.PointToClient(pt);
// Do we need to scroll the view?
if (mImageListView.ScrollOrientation == ScrollOrientation.VerticalScroll &&
pt.Y > mImageListView.ClientRectangle.Bottom - 20)
{
scrollTimer.Tag = -120;
scrollTimer.Enabled = true;
}
else if (mImageListView.ScrollOrientation == ScrollOrientation.VerticalScroll &&
pt.Y < mImageListView.ClientRectangle.Top + 20)
{
scrollTimer.Tag = 120;
scrollTimer.Enabled = true;
}
else if (mImageListView.ScrollOrientation == ScrollOrientation.HorizontalScroll &&
pt.X > mImageListView.ClientRectangle.Right - 20)
{
scrollTimer.Tag = -120;
scrollTimer.Enabled = true;
}
else if (mImageListView.ScrollOrientation == ScrollOrientation.HorizontalScroll &&
pt.X < mImageListView.ClientRectangle.Left + 20)
{
scrollTimer.Tag = 120;
scrollTimer.Enabled = true;
}
else
{
scrollTimer.Enabled = false;
}
// Normalize to item area coordinates
pt.X -= mImageListView.layoutManager.ItemAreaBounds.Left;
pt.Y -= mImageListView.layoutManager.ItemAreaBounds.Top;
// Row and column mouse is over
bool dragCaretOnRight = false;
int index = 0;
if (mImageListView.ScrollOrientation == ScrollOrientation.HorizontalScroll)
{
index = (pt.X + mImageListView.ViewOffset.X) / mImageListView.layoutManager.ItemSizeWithMargin.Width;
}
else
{
int col = pt.X / mImageListView.layoutManager.ItemSizeWithMargin.Width;
int row = (pt.Y + mImageListView.ViewOffset.Y) / mImageListView.layoutManager.ItemSizeWithMargin.Height;
if (col > mImageListView.layoutManager.Cols - 1)
{
col = mImageListView.layoutManager.Cols - 1;
dragCaretOnRight = true;
}
index = row * mImageListView.layoutManager.Cols + col;
}
if (index < 0)
{
index = 0;
}
if (index > mImageListView.Items.Count - 1)
{
index = mImageListView.Items.Count - 1;
dragCaretOnRight = true;
}
ImageListViewItem dragDropTarget = mImageListView.Items[index];
if (selfDragging && (dragDropTarget.Selected ||
(!dragCaretOnRight && index > 0 && mImageListView.Items[index - 1].Selected) ||
(dragCaretOnRight && index < mImageListView.Items.Count - 1 && mImageListView.Items[index + 1].Selected)))
{
e.Effect = DragDropEffects.None;
dragDropTarget = null;
}
else if (selfDragging)
{
e.Effect = DragDropEffects.Copy;
}
else
{
e.Effect = DragDropEffects.Copy;
}
if (!ReferenceEquals(dragDropTarget, DropTarget) || dragCaretOnRight != DropToRight)
{
DropTarget = dragDropTarget;
DropToRight = dragCaretOnRight;
mImageListView.Refresh(true);
}
}
}
else
{
e.Effect = DragDropEffects.None;
}
}
/// <summary>
/// Handles control's MouseMove event.
/// </summary>
public void MouseMove(MouseEventArgs e)
{
ImageListViewItem oldHoveredItem = HoveredItem;
ImageListView.ImageListViewColumnHeader oldHoveredColumn = HoveredColumn;
ImageListView.ImageListViewColumnHeader oldHoveredSeparator = HoveredSeparator;
DoHitTest(e.Location);
mImageListView.mRenderer.SuspendPaint();
// Do we need to scroll the view?
if (MouseSelecting && mImageListView.ScrollOrientation == ScrollOrientation.VerticalScroll && !scrollTimer.Enabled)
{
if (e.Y > mImageListView.ClientRectangle.Bottom)
{
scrollTimer.Tag = -120;
scrollTimer.Enabled = true;
}
else if (e.Y < mImageListView.ClientRectangle.Top)
{
scrollTimer.Tag = 120;
scrollTimer.Enabled = true;
}
}
else if (MouseSelecting && mImageListView.ScrollOrientation == ScrollOrientation.HorizontalScroll && !scrollTimer.Enabled)
{
if (e.X > mImageListView.ClientRectangle.Right)
{
scrollTimer.Tag = -120;
scrollTimer.Enabled = true;
}
else if (e.X < mImageListView.ClientRectangle.Left)
{
scrollTimer.Tag = 120;
scrollTimer.Enabled = true;
}
}
else if (scrollTimer.Enabled && mImageListView.ClientRectangle.Contains(e.Location))
{
scrollTimer.Enabled = false;
}
if (DraggingSeperator)
{
int delta = e.Location.X - lastSeparatorDragLocation.X;
int colwidth = SelectedSeperator.Width + delta;
if (colwidth > 16)
{
lastSeparatorDragLocation = e.Location;
}
else
{
lastSeparatorDragLocation = new Point(e.Location.X - colwidth + 16, e.Location.Y);
colwidth = 16;
}
SelectedSeperator.Width = colwidth;
HoveredItem = null;
HoveredColumn = SelectedSeperator;
HoveredSeparator = SelectedSeperator;
mImageListView.Refresh();
}
else if (ResizingPane)
{
int delta = e.Location.X - lastPaneResizeLocation.X;
int width = mImageListView.mPaneWidth + delta;
if (width > 2)
{
lastPaneResizeLocation = e.Location;
}
else
{
lastPaneResizeLocation = new Point(e.Location.X - width + 2, e.Location.Y);
width = 2;
}
mImageListView.mPaneWidth = width;
HoveredItem = null;
HoveredColumn = null;
HoveredSeparator = null;
mImageListView.Refresh();
}
else if (MouseSelecting)
{
if (!ShiftKey && !ControlKey)
{
mImageListView.SelectedItems.Clear(false);
}
// Create the selection rectangle
Point viewOffset = mImageListView.ViewOffset;
Point pt1 = new Point(lastMouseDownLocation.X - (viewOffset.X - lastViewOffset.X),
lastMouseDownLocation.Y - (viewOffset.Y - lastViewOffset.Y));
Point pt2 = new Point(e.Location.X, e.Location.Y);
SelectionRectangle = new Rectangle(Math.Min(pt1.X, pt2.X), Math.Min(pt1.Y, pt2.Y), Math.Abs(pt1.X - pt2.X), Math.Abs(pt1.Y - pt2.Y));
// Normalize to item area coordinates
pt1 = new Point(SelectionRectangle.Left, SelectionRectangle.Top);
pt2 = new Point(SelectionRectangle.Right, SelectionRectangle.Bottom);
Point itemAreaOffset = new Point(-mImageListView.layoutManager.ItemAreaBounds.Left,
-mImageListView.layoutManager.ItemAreaBounds.Top);
pt1.Offset(itemAreaOffset);
pt2.Offset(itemAreaOffset);
// Determine which items are highlighted
highlightedItems.Clear();
int startRow = (int)Math.Floor((float)(Math.Min(pt1.Y, pt2.Y) + viewOffset.Y) /
(float)mImageListView.layoutManager.ItemSizeWithMargin.Height);
int endRow = (int)Math.Floor((float)(Math.Max(pt1.Y, pt2.Y) + viewOffset.Y) /
(float)mImageListView.layoutManager.ItemSizeWithMargin.Height);
int startCol = (int)Math.Floor((float)(Math.Min(pt1.X, pt2.X) + viewOffset.X) /
(float)mImageListView.layoutManager.ItemSizeWithMargin.Width);
int endCol = (int)Math.Floor((float)(Math.Max(pt1.X, pt2.X) + viewOffset.X) /
(float)mImageListView.layoutManager.ItemSizeWithMargin.Width);
if (mImageListView.ScrollOrientation == ScrollOrientation.HorizontalScroll &&
(startRow >= 0 || endRow >= 0))
{
for (int i = startCol; i <= endCol; i++)
{
for (int col = startCol; col <= endCol; col++)
{
if (i >= 0 && i <= mImageListView.Items.Count - 1 &&
!highlightedItems.ContainsKey(mImageListView.Items[i]))
{
highlightedItems.Add(mImageListView.Items[i],
(ControlKey ? !mImageListView.Items[i].Selected : true));
}
}
}
}
else if (mImageListView.ScrollOrientation == ScrollOrientation.VerticalScroll &&
(startCol >= 0 || endCol >= 0) && (startRow >= 0 || endRow >= 0) &&
(startCol <= mImageListView.layoutManager.Cols - 1 || endCol <= mImageListView.layoutManager.Cols - 1))
{
startCol = Math.Min(mImageListView.layoutManager.Cols - 1, Math.Max(0, startCol));
endCol = Math.Min(mImageListView.layoutManager.Cols - 1, Math.Max(0, endCol));
for (int row = startRow; row <= endRow; row++)
{
for (int col = startCol; col <= endCol; col++)
{
int i = row * mImageListView.layoutManager.Cols + col;
if (i >= 0 && i <= mImageListView.Items.Count - 1 &&
!highlightedItems.ContainsKey(mImageListView.Items[i]))
{
highlightedItems.Add(mImageListView.Items[i],
(ControlKey ? !mImageListView.Items[i].Selected : true));
}
}
}
}
HoveredColumn = null;
HoveredSeparator = null;
SelectedSeperator = null;
mImageListView.Refresh();
}
else if (!MouseSelecting && !DraggingSeperator && !ResizingPane &&
inItemArea && lastMouseDownInItemArea &&
(LeftButton || RightButton) &&
((Math.Abs(e.Location.X - lastMouseDownLocation.X) > SelectionTolerance ||
Math.Abs(e.Location.Y - lastMouseDownLocation.Y) > SelectionTolerance)))
{
if (!lastMouseDownOverItem && HoveredItem == null)
{
// Start mouse selection
MouseSelecting = true;
SelectionRectangle = new Rectangle(lastMouseDownLocation, new Size(0, 0));
mImageListView.Refresh();
}
else if (lastMouseDownOverItem && HoveredItem != null && mImageListView.AllowDrag)
{
// Start drag&drop
if (!HoveredItem.Selected)
{
mImageListView.SelectedItems.Clear(false);
HoveredItem.mSelected = true;
mImageListView.OnSelectionChangedInternal();
DropTarget = null;
mImageListView.Refresh(true);
}
// Set drag data
List <string> filenames = new List <string>();
foreach (ImageListViewItem item in mImageListView.SelectedItems)
{
if (item.isVirtualItem)
{
// Get the virtual item source image
VirtualItemImageEventArgs ve = new VirtualItemImageEventArgs(item.mVirtualItemKey);
mImageListView.RetrieveVirtualItemImageInternal(ve);
if (!string.IsNullOrEmpty(ve.FileName))
{
filenames.Add(ve.FileName);
}
}
else
{
filenames.Add(item.FileName);
}
}
DataObject data = new DataObject(DataFormats.FileDrop, filenames.ToArray());
DropTarget = null;
selfDragging = true;
mImageListView.DoDragDrop(data, DragDropEffects.Copy);
selfDragging = false;
// Since the MouseUp event will be eaten by DoDragDrop we will not receive
// the MouseUp event. We need to manually update mouse button flags after
// the drop.
if ((Control.MouseButtons & MouseButtons.Left) == MouseButtons.None)
{
LeftButton = false;
}
if ((Control.MouseButtons & MouseButtons.Right) == MouseButtons.None)
{
RightButton = false;
}
}
}
else if (!MouseSelecting && !DraggingSeperator && !ResizingPane &&
inHeaderArea && lastMouseDownInColumnHeaderArea && lastMouseDownOverSeparator && LeftButton &&
mImageListView.AllowColumnResize && HoveredSeparator != null)
{
// Start dragging a separator
DraggingSeperator = true;
SelectedSeperator = HoveredSeparator;
lastSeparatorDragLocation = e.Location;
}
else if (!MouseSelecting && !DraggingSeperator && !ResizingPane &&
inPaneArea && lastMouseDownInPaneArea && lastMouseDownOverPaneBorder && LeftButton &&
mImageListView.AllowPaneResize && HoveredPaneBorder != false)
{
// Start dragging the pane
ResizingPane = true;
lastPaneResizeLocation = e.Location;
}
else if (!ReferenceEquals(HoveredItem, oldHoveredItem) ||
!ReferenceEquals(HoveredColumn, oldHoveredColumn) ||
!ReferenceEquals(HoveredSeparator, oldHoveredSeparator))
{
// Hovered item changed
if (!ReferenceEquals(HoveredItem, oldHoveredItem))
{
mImageListView.OnItemHover(new ItemHoverEventArgs(HoveredItem, oldHoveredItem));
}
if (!ReferenceEquals(HoveredColumn, oldHoveredColumn))
{
mImageListView.OnColumnHover(new ColumnHoverEventArgs(HoveredColumn, oldHoveredColumn));
}
mImageListView.Refresh();
}
mImageListView.mRenderer.ResumePaint();
// Change to size cursor if mouse is over a column separator or pane border
if (mImageListView.Cursor != Cursors.VSplit && mImageListView.Focused && !MouseSelecting)
{
if ((mImageListView.AllowColumnResize && HoveredSeparator != null) ||
(mImageListView.AllowPaneResize && HoveredPaneBorder != false))
{
mImageListView.Cursor = Cursors.VSplit;
}
}
else if (mImageListView.Cursor == Cursors.VSplit)
{
if (!((inHeaderArea && (DraggingSeperator || HoveredSeparator != null)) ||
(inPaneArea && (ResizingPane || HoveredPaneBorder != false))))
{
mImageListView.Cursor = Cursors.Default;
}
}
lastMouseMoveLocation = e.Location;
}