protected override void OnNavigatedTo(NavigationEventArgs e)
{
base.OnNavigatedTo(e);
var settings = new Models.Domain.FolderItemListing.FolderListingSettings();
if (settings.IsForceEnableXYNavigation ||
Xamarin.Essentials.DeviceInfo.Idiom == Xamarin.Essentials.DeviceIdiom.TV
)
{
if (FoldersAdaptiveGridView.Items.Any())
{
var firstItem = FoldersAdaptiveGridView.Items.First();
var itemContainer = FoldersAdaptiveGridView.ContainerFromItem(firstItem) as Control;
itemContainer.Focus(FocusState.Keyboard);
}
else if (FileItemsRepeater_Small.ItemsSource != null && FileItemsRepeater_Small.Visibility == Visibility.Visible)
{
var item = FileItemsRepeater_Small.FindDescendant <Control>();
item?.Focus(FocusState.Keyboard);
}
else if (FileItemsRepeater_Midium.ItemsSource != null && FileItemsRepeater_Midium.Visibility == Visibility.Visible)
{
var item = FileItemsRepeater_Midium.FindDescendant <Control>();
item?.Focus(FocusState.Keyboard);
}
else if (FileItemsRepeater_Large.ItemsSource != null && FileItemsRepeater_Large.Visibility == Visibility.Visible)
{
var item = FileItemsRepeater_Large.FindDescendant <Control>();
item?.Focus(FocusState.Keyboard);
}
else
{
ReturnSourceFolderPageButton.Focus(FocusState.Keyboard);
this.FoldersAdaptiveGridView.ContainerContentChanging -= FoldersAdaptiveGridView_ContainerContentChanging;
this.FileItemsRepeater_Small.ElementPrepared -= FileItemsRepeater_Large_ElementPrepared;
this.FileItemsRepeater_Midium.ElementPrepared -= FileItemsRepeater_Large_ElementPrepared;
this.FileItemsRepeater_Large.ElementPrepared -= FileItemsRepeater_Large_ElementPrepared;
this.FoldersAdaptiveGridView.ContainerContentChanging += FoldersAdaptiveGridView_ContainerContentChanging;
this.FileItemsRepeater_Small.ElementPrepared += FileItemsRepeater_Large_ElementPrepared;
this.FileItemsRepeater_Midium.ElementPrepared += FileItemsRepeater_Large_ElementPrepared;
this.FileItemsRepeater_Large.ElementPrepared += FileItemsRepeater_Large_ElementPrepared;
}
}
}
protected override async void OnNavigatedTo(NavigationEventArgs e)
{
base.OnNavigatedTo(e);
await Task.Delay(500);
var settings = new Models.Domain.FolderItemListing.FolderListingSettings();
if (settings.IsForceEnableXYNavigation ||
Xamarin.Essentials.DeviceInfo.Idiom == Xamarin.Essentials.DeviceIdiom.TV
)
{
if (FoldersAdaptiveGridView.Items.Any())
{
var firstItem = FoldersAdaptiveGridView.Items.First();
var itemContainer = FoldersAdaptiveGridView.ContainerFromItem(firstItem) as Control;
if (itemContainer != null)
{
itemContainer.Focus(FocusState.Keyboard);
}
}
}
}
public async void BringIntoViewLastIntractItem()
{
var pageVM = (DataContext as FolderListupPageViewModel);
var lastIntaractItem = pageVM.FolderLastIntractItem.Value;
if (lastIntaractItem != null)
{
DependencyObject item;
do
{
item = FoldersAdaptiveGridView.ContainerFromItem(lastIntaractItem);
await Task.Delay(10);
}while (item == null);
if (item is Control control)
{
var transform = control.TransformToVisual(RootScrollViewer);
var positionInScrollViewer = transform.TransformPoint(new Point(0, 0));
RootScrollViewer.ChangeView(null, positionInScrollViewer.Y, null, true);
control.Focus(FocusState.Keyboard);
}
}
else if (pageVM.ImageLastIntractItem.Value >= 1)
{
// 実際にスクロールするまでItemTemplateは解決されない
// 一旦Opacity=0.0に設定した上で要素が取れるまでプログラマチックにスクロールしていく
// 要素が取れてスクロールが完了したらOpacity=1.0に戻す
/*
* DependencyObject item;
* var visibleItemsRepeater = new[] { FileItemsRepeater_Line, FileItemsRepeater_Small, FileItemsRepeater_Midium, FileItemsRepeater_Large }.First(x => x.Visibility == Visibility.Visible);
* visibleItemsRepeater.Opacity = 0.0;
* RootScrollViewer.VerticalScrollBarVisibility = ScrollBarVisibility.Hidden;
* double offset = 0;
* {
* var transform = visibleItemsRepeater.TransformToVisual(RootScrollViewer);
* var positionInScrollViewer = transform.TransformPoint(new Point(0, 0));
* RootScrollViewer.ChangeView(null, positionInScrollViewer.Y, null, true);
* offset = positionInScrollViewer.Y;
* }
*
* do
* {
* item = visibleItemsRepeater.TryGetElement(pageVM.ImageLastIntractItem.Value);
*
* RootScrollViewer.ChangeView(null, offset, null, true);
*
* offset += RootScrollViewer.ViewportHeight;
*
* await Task.Delay(10);
* }
* while (item == null);
*
* await Task.Delay(100);
*
* if (item is Control control)
* {
* var transform = control.TransformToVisual(RootScrollViewer);
* var positionInScrollViewer = transform.TransformPoint(new Point(0, 0));
* control.Focus(FocusState.Keyboard);
* RootScrollViewer.StartBringIntoView(new BringIntoViewOptions() { AnimationDesired = false });
* // RootScrollViewer.ChangeView(null, positionInScrollViewer.Y, null, true);
* }
*
* visibleItemsRepeater.Opacity = 1.0;
* RootScrollViewer.VerticalScrollBarVisibility = ScrollBarVisibility.Visible;
*/
}
}
