private bool m_DragVisible; // true if the current drag is moving the visible area. False means it is rearranging pages
// once the user moves far enough to trigger page rearrangement, it never reverts to adjusting the visible area
private void ctrPages_MouseClick(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Right)
{
if (Globals.Root.CurrentConfig.ReadBoolean(Config.Context_Menus))
{
DisplayContextMenu?.Invoke(e.Location);
}
return;
}
int pageIndex = HitTest(e.Location);
if (pageIndex < 0 || pageIndex >= m_Document.Count)
{
return;
}
if (pageIndex != m_DisplayedIndex)
{
DisplayPage?.Invoke(pageIndex);
}
// don't also move within page (tried it and OK, but I think can be confusing)
else if (!m_DisplayArea.IsEmpty)
{
// if m_rctDisplayArea is empty it implies that the entire page is displayed at once, so no point asking to scroll the display
Rectangle pageBounds = PageBounds(pageIndex);
Page page = m_Document.Page(pageIndex);
PointF data = new PointF((e.X - pageBounds.Left) * page.Size.Width / pageBounds.Width,
(pageBounds.Bottom - e.Y) * page.Size.Height / pageBounds.Height); //note that the Y coordinate is inverted between the screen and page
CentreViewOn?.Invoke(data);
}
}
private void ctrPages_MouseMove(object sender, MouseEventArgs e)
{
if (!m_DragTrigger.IsEmpty && !m_DragTrigger.Contains(e.X, e.Y) && m_HitPage >= 0)
{
m_DragPage = m_HitPage;
m_DragTrigger = Rectangle.Empty;
// will flow thru into next condition...
m_DragPageLocation = PageBounds(m_DragPage);
Capture = true;
Invalidate();
if (m_DragPage != m_DisplayedIndex)
{
DisplayPage?.Invoke(m_DragPage);
}
}
if (m_DragPage >= 0)
{
// already dragging. If the drag is quite small we will just move the visible area. If it is larger we will start rearranging pages
Rectangle visible = VisibleAreaLocal();
visible.X = e.X + m_VisibleOffset.Width;
visible.Y = e.Y + m_VisibleOffset.Height; // this is where the visible area would be if we just drag it
// if this has gone significantly outside the page that we will treat this as page rearranging
Rectangle pageBounds = PageBounds(m_DragPage);
pageBounds.Inflate(12, 20);
if (!m_HasDraggedOutside && !m_DragVisible)
{
Invalidate(m_DragPageLocation);
}
if (m_DragVisible && pageBounds.Contains(visible))
{
pageBounds.Inflate(-12, -20);
Page page = m_Document.Page(m_DragPage);
// we then centre the view on the centre of this rectangle (see MouseClick)
Point local = new Point(visible.X + visible.Width / 2, visible.Y + visible.Height / 2);
PointF data = new PointF((local.X - pageBounds.Left) * page.Size.Width / pageBounds.Width, (pageBounds.Bottom - local.Y) * page.Size.Height / pageBounds.Height); //note that the Y coordinate is inverted between the screen and page
CentreViewOn?.Invoke(data);
}
else
{
if (m_DragVisible)
{
Invalidate(PageBounds(m_DragPage));
}
m_DragVisible = false;
// keep width and height of drag version, but move TL
m_DragPageLocation.X = e.X + m_DragPageOffset.Width;
m_DragPageLocation.Y = e.Y + m_DragPageOffset.Height;
m_HasDraggedOutside = e.X <0 || e.Y <0 || e.X> Width || e.Y> Height;
if (m_HasDraggedOutside)
{
if (m_DropBefore >= 0)
{
Invalidate(InsertMarkerBounds(m_DropBefore));
}
m_DropBefore = -1;
}
else
{
int newIndex = HitTestInsert(e.Location);
if (newIndex == m_DragPage || newIndex == m_DragPage + 1)
{
newIndex = -1; // moving page before or after itself want actually change anything!
}
if (newIndex != m_DropBefore)
{
Invalidate(InsertMarkerBounds(m_DropBefore));
Invalidate(InsertMarkerBounds(newIndex));
}
m_DropBefore = newIndex;
Invalidate(m_DragPageLocation);
}
}
}
}