bool KeyboardScroll(Gdk.ModifierType modifier, int relative_row, bool align_y)
{
if (Model == null)
{
return(true);
}
int row_limit;
if (relative_row < 0)
{
if (Selection.FocusedIndex == -1)
{
return(false);
}
row_limit = 0;
}
else
{
row_limit = Model.Count - 1;
}
if (Selection.FocusedIndex == row_limit)
{
return(true);
}
int scroll_target_item_index = Math.Min(Model.Count - 1, Math.Max(0, Selection.FocusedIndex + relative_row));
if (Selection != null)
{
if ((modifier & Gdk.ModifierType.ControlMask) != 0)
{
// Don't change the selection
}
else if ((modifier & Gdk.ModifierType.ShiftMask) != 0)
{
// Behave like nautilus: if and arrow key + shift is pressed and the currently focused item
// is not selected, select it and don't move the focus or vadjustment.
// Otherwise, select the new row and scroll etc as necessary.
if (relative_row * relative_row != 1)
{
Selection.SelectFromFirst(scroll_target_item_index, true, false);
}
else if (Selection.Contains(Selection.FocusedIndex))
{
Selection.SelectFromFirst(scroll_target_item_index, true, false);
}
else
{
Selection.Select(Selection.FocusedIndex, false);
return(true);
}
}
else
{
Selection.Clear(false);
Selection.Select(scroll_target_item_index, false);
}
}
// Scroll if needed
double y_at_row = GetViewPointForModelRow(scroll_target_item_index).Y;
if (align_y)
{
if (y_at_row < VadjustmentValue)
{
ScrollToY(y_at_row);
}
else if (vadjustment != null)
{
var bottom_of_item = y_at_row + ChildSize.Height;
var bottom_of_view = vadjustment.Value + vadjustment.PageSize;
if (bottom_of_item > bottom_of_view)
{
// Scroll down just enough to put the item fully into view
ScrollToY(bottom_of_item - (vadjustment.PageSize));
}
}
}
else if (vadjustment != null)
{
ScrollToY(vadjustment.Value + y_at_row - GetViewPointForModelRow(Selection.FocusedIndex).Y);
}
Selection.FocusedIndex = scroll_target_item_index;
InvalidateList();
return(true);
}
bool OnListButtonPressEvent(Gdk.EventButton evnt)
{
if (Model == null)
{
return(true);
}
int x = (int)evnt.X - list_interaction_alloc.X;
int y = (int)evnt.Y - list_interaction_alloc.Y;
GrabFocus();
int row_index = GetModelRowAt(x, y);
if (row_index < 0 || row_index >= Model.Count)
{
Gtk.Drag.SourceUnset(this);
return(true);
}
if (LayoutChildHandlesEvent(evnt, true))
{
return(true);
}
ProxyEventToCell(evnt, true);
object item = model[row_index];
if (item == null)
{
return(true);
}
if (evnt.Button == 1 && evnt.Type == Gdk.EventType.TwoButtonPress)
{
// Double clicked
OnRowActivated();
}
else if (Selection != null)
{
if ((evnt.State & Gdk.ModifierType.ControlMask) != 0)
{
if (evnt.Button == 3)
{
// Right clicked with ctrl pressed, so make sure row selected
if (!Selection.Contains(row_index))
{
Selection.Select(row_index);
}
}
else
{
// Normal ctrl-click, so toggle
Selection.ToggleSelect(row_index);
}
}
else if ((evnt.State & Gdk.ModifierType.ShiftMask) != 0)
{
// Shift-click, so select from first-row-selected (if any) to the current row
Selection.SelectFromFirst(row_index, true);
}
else
{
if (evnt.Button == 3)
{
// Normal right-click, make sure row is only row selected
if (!Selection.Contains(row_index))
{
Selection.Clear(false);
Selection.Select(row_index);
}
}
else
{
// Normal click, if row not already selected, select only it right now,
// but if it's already selected, wait until the Release to unselect any others so that
// drag and drop of 2+ items works.
if (!Selection.Contains(row_index))
{
Selection.Clear(false);
Selection.Select(row_index);
}
}
}
FocusModelRow(row_index);
// Now that we've worked out the selections, open the context menu
if (evnt.Button == 3)
{
OnPopupMenu();
}
}
InvalidateList();
return(true);
}
private bool KeyboardScroll(Gdk.ModifierType modifier, int relative_row, bool align_y)
{
if (Model == null)
{
return(true);
}
int row_limit;
if (relative_row < 0)
{
if (Selection.FocusedIndex == -1)
{
return(false);
}
row_limit = 0;
}
else
{
row_limit = Model.Count - 1;
}
if (Selection.FocusedIndex == row_limit)
{
return(true);
}
int row_index = Math.Min(Model.Count - 1, Math.Max(0, Selection.FocusedIndex + relative_row));
if (Selection != null)
{
if ((modifier & Gdk.ModifierType.ControlMask) != 0)
{
// Don't change the selection
}
else if ((modifier & Gdk.ModifierType.ShiftMask) != 0)
{
// Behave like nautilus: if and arrow key + shift is pressed and the currently focused item
// is not selected, select it and don't move the focus or vadjustment.
// Otherwise, select the new row and scroll etc as necessary.
if (relative_row * relative_row != 1)
{
Selection.SelectFromFirst(row_index, true);
}
else if (Selection.Contains(Selection.FocusedIndex))
{
Selection.SelectFromFirst(row_index, true);
}
else
{
Selection.Select(Selection.FocusedIndex);
return(true);
}
}
else
{
Selection.Clear(false);
Selection.Select(row_index);
}
}
// Scroll if needed
double y_at_row = GetYAtRow(row_index);
if (align_y)
{
if (y_at_row < VadjustmentValue)
{
ScrollTo(y_at_row);
}
else if (vadjustment != null && (y_at_row + RowHeight) > (vadjustment.Value + vadjustment.PageSize))
{
ScrollTo(y_at_row + RowHeight - (vadjustment.PageSize));
}
}
else if (vadjustment != null)
{
ScrollTo(vadjustment.Value + ((row_index - Selection.FocusedIndex) * RowHeight));
}
Selection.FocusedIndex = row_index;
InvalidateList();
return(true);
}