private void SelectRow(FileSystemElement fse)
{
if (SelectedItems.Contains(fse))
{
return;
}
var container = (ContentPresenter)ItemsSourceRowHitbox.ContainerFromItem(fse);
if (container == null)
{
return;
}
var hitbox = (FrameworkElement)VisualTreeHelper.GetChild(container, 0);
SelectedItems.Add(fse);
selectedElements.Add(hitbox);
//When item which is going to be selected and is focused apply different style
if (fse == FocusedItem)
{
hitbox.Style = (Style)Resources["RowSelectedFocusedStyle"];
}
else
{
hitbox.Style = (Style)Resources["RowSelectedStyle"];
}
}
private void TryScrollFocusSelect(FileSystemElement fse)
{
//Check if the element is even rendered
var container = (ContentPresenter)ItemsSourceRowHitbox.ContainerFromItem(fse);
if (container == null)
{
ScrollTo(fse);
return;
}
var childTransform = container.TransformToVisual(ScrollViewer);
var rectangle = childTransform.TransformBounds(new Rect(new Point(0, 0), container.RenderSize));
var scrollViewerRect = new Rect(new Point(0, 0), ScrollViewer.RenderSize);
//Check if the elements Rect intersects with that of the scrollviewer's
scrollViewerRect.Intersect(rectangle);
//Not in view
if (scrollViewerRect.IsEmpty)
{
ScrollTo(fse);
}
var hitbox = (FrameworkElement)VisualTreeHelper.GetChild(container, 0);
ToggleSelect(fse, hitbox);
FocusRow(fse, hitbox);
}
private void DeselectRow(FileSystemElement fse)
{
var container = (ContentPresenter)ItemsSourceRowHitbox.ContainerFromItem(fse);
var hitbox = (FrameworkElement)VisualTreeHelper.GetChild(container, 0);
SelectedItems.Remove(fse);
selectedElements.Remove(hitbox);
StyleHitbox(fse, hitbox, ROW_DEFAULT_STYLE_NAME);
}
private void ApplySelectedStyle(FileSystemElement fse)
{
var container = (ContentPresenter)ItemsSourceRowHitbox.ContainerFromItem(fse);
if (container == null)
{
return;
}
var hitbox = (FrameworkElement)VisualTreeHelper.GetChild(container, 0);
selectedElements.Add(hitbox);
//When item which is going to be selected is focused apply different style
StyleHitbox(hitbox, "RowSelected");
}
private void ToggleSelect(FileSystemElement fse)
{
var container = (ContentPresenter)ItemsSourceRowHitbox.ContainerFromItem(fse);
var hitbox = (FrameworkElement)VisualTreeHelper.GetChild(container, 0);
if (SelectedItems.Contains(fse))
{
DeselectRow(fse, hitbox);
return;
}
SelectedItems.Add(fse);
selectedElements.Add(hitbox);
StyleHitbox(fse, hitbox, ROW_SELECTED_STYLE_NAME);
}
private void FocusRow(FileSystemElement fse, bool usedKeyboard = false)
{
//Remove focus highlight from old row
//If there has already been a focused element
if (focusedRow != null)
{
if (SelectedItems.Contains(FocusedItem))
{
focusedRow.Style = (Style)Resources["RowSelectedStyle"];
}
else
{
focusedRow.Style = (Style)Resources["RowDefaultStyle"];
}
}
//Scroll to focused item when the user navigates through files with the keyboard
if (usedKeyboard)
{
ScrollTo(fse);
}
//Fetch row (border) from hitboxes (see xaml)
var container = (ContentPresenter)ItemsSourceRowHitbox.ContainerFromItem(fse);
if (container == null)
{
return;
}
var row = (FrameworkElement)VisualTreeHelper.GetChild(container, 0);
//Store FileSystemElement(for checking if its selected) and Border (for styling)
FocusedItem = fse;
focusedRow = row;
//Apply focused style to new row
if (SelectedItems.Contains(FocusedItem))
{
focusedRow.Style = (Style)Resources["RowSelectedFocusedStyle"];
}
else
{
focusedRow.Style = (Style)Resources["RowDefaultFocusedStyle"];
}
}
private void SelectRowsBetween(FileSystemElement fse)
{
var lastTappedRowIndex = FocusedItem == null ? 0 : ItemsSource.IndexOf(FocusedItem); //SelectedItems.Count == 0 ? -1 : ItemsSource.IndexOf(SelectedItems.Last());
var tappedRowIndex = ItemsSource.IndexOf(fse);
var from = Math.Min(lastTappedRowIndex, tappedRowIndex);
var to = Math.Max(lastTappedRowIndex, tappedRowIndex);
for (int i = from; i <= to; i++)
{
//if (i == lastTappedRowIndex) continue;
var item = ItemsSource[i];
var container = (ContentPresenter)ItemsSourceRowHitbox.ContainerFromItem(item);
var row = (FrameworkElement)VisualTreeHelper.GetChild(container, 0);
if (!SelectedItems.Contains(item))
{
ToggleSelect(item, row);
}
}
}
