public SnapPointsCodeGallery(ItemsLayout itemsLayout)
{
Title = $"Snap Points (Code, {itemsLayout})";
var layout = new Grid
{
RowDefinitions = new RowDefinitionCollection
{
new RowDefinition {
Height = GridLength.Auto
},
new RowDefinition {
Height = GridLength.Auto
},
new RowDefinition {
Height = GridLength.Auto
},
new RowDefinition {
Height = GridLength.Auto
},
new RowDefinition {
Height = GridLength.Star
}
}
};
itemsLayout.SnapPointsAlignment = SnapPointsAlignment.Start;
itemsLayout.SnapPointsType = SnapPointsType.None;
var itemTemplate = ExampleTemplates.SnapPointsTemplate();
var collectionView = new CollectionView
{
ItemsLayout = itemsLayout,
ItemTemplate = itemTemplate,
};
var generator = new ItemsSourceGenerator(collectionView, initialItems: 50);
var snapPointsTypeSelector = new EnumSelector <SnapPointsType>(() => itemsLayout.SnapPointsType,
type => itemsLayout.SnapPointsType = type);
var snapPointsAlignmentSelector = new EnumSelector <SnapPointsAlignment>(() => itemsLayout.SnapPointsAlignment,
type => itemsLayout.SnapPointsAlignment = type);
var flowDirectionSelector = new EnumSelector <FlowDirection>(() => layout.FlowDirection,
type => layout.FlowDirection = type);
layout.Children.Add(generator);
layout.Children.Add(snapPointsTypeSelector);
layout.Children.Add(snapPointsAlignmentSelector);
layout.Children.Add(flowDirectionSelector);
layout.Children.Add(collectionView);
Grid.SetRow(snapPointsTypeSelector, 1);
Grid.SetRow(snapPointsAlignmentSelector, 2);
Grid.SetRow(flowDirectionSelector, 3);
Grid.SetRow(collectionView, 4);
Content = layout;
generator.GenerateItems();
}
public ScrollToIndexControl(ItemsView itemsView, bool showPositionSelector = true)
{
_itemsView = itemsView;
var layout = new StackLayout {
Margin = 3
};
var indexLabel = new Label {
Text = "Scroll To Index: ", VerticalTextAlignment = TextAlignment.Center
};
_entry = new Entry {
Keyboard = Keyboard.Numeric, Text = "0", WidthRequest = 200
};
var indexButton = new Button {
Text = "Go"
};
indexButton.Clicked += ScrollTo;
var row1 = new StackLayout {
Orientation = StackOrientation.Horizontal
};
row1.Children.Add(indexLabel);
row1.Children.Add(_entry);
row1.Children.Add(indexButton);
layout.Children.Add(row1);
var animateLabel = new Label {
Text = "Animate: ", VerticalTextAlignment = TextAlignment.Center
};
_animateSwitch = new Switch {
IsToggled = true
};
var row2 = new StackLayout {
Orientation = StackOrientation.Horizontal
};
row2.Children.Add(animateLabel);
row2.Children.Add(_animateSwitch);
_currentIndex = new Label
{
Text = _index.ToString(),
WidthRequest = 100,
VerticalTextAlignment = TextAlignment.Center,
HorizontalTextAlignment = TextAlignment.Center
};
var forwardButton = new Button {
Text = "Advance 1 >>"
};
forwardButton.Clicked += (sender, args) =>
{
_index = _index + 1;
_currentIndex.Text = _index.ToString();
ScrollToIndex(_index);
};
var backButton = new Button {
Text = "<< Back 1"
};
backButton.Clicked += (sender, args) =>
{
if (_index > 0)
{
_index = _index - 1;
_currentIndex.Text = _index.ToString();
ScrollToIndex(_index);
}
};
layout.Children.Add(row2);
var row3 = new StackLayout {
Orientation = StackOrientation.Horizontal
};
row3.Children.Add(backButton);
row3.Children.Add(_currentIndex);
row3.Children.Add(forwardButton);
layout.Children.Add(row3);
if (showPositionSelector)
{
var row4 = new StackLayout {
Orientation = StackOrientation.Horizontal
};
var scrollPositionSelector = new EnumSelector <ScrollToPosition>(() => _currentScrollToPosition,
type => _currentScrollToPosition = type);
row4.Children.Add(scrollPositionSelector);
layout.Children.Add(row4);
}
Content = layout;
}
public ScrollToItemControl(ItemsView itemsView, bool showPositionSelector = true)
{
_itemsView = itemsView;
var layout = new StackLayout {
Margin = 3
};
_itemsView.PropertyChanged += (sender, args) =>
{
if (args.PropertyName == ItemsView.ItemsSourceProperty.PropertyName)
{
var items = new List <object>();
foreach (var item in itemsView.ItemsSource)
{
items.Add(item);
}
_picker.ItemsSource = items;
}
};
var indexLabel = new Label {
Text = "Scroll To Item: ", VerticalTextAlignment = TextAlignment.Center
};
_picker = new Picker {
WidthRequest = 200
};
var indexButton = new Button {
Text = "Go"
};
indexButton.Clicked += ScrollTo;
var row1 = new StackLayout {
Orientation = StackOrientation.Horizontal
};
row1.Children.Add(indexLabel);
row1.Children.Add(_picker);
row1.Children.Add(indexButton);
layout.Children.Add(row1);
var animateLabel = new Label {
Text = "Animate: ", VerticalTextAlignment = TextAlignment.Center
};
_animateSwitch = new Switch {
IsToggled = true
};
var row2 = new StackLayout {
Orientation = StackOrientation.Horizontal
};
row2.Children.Add(animateLabel);
row2.Children.Add(_animateSwitch);
layout.Children.Add(row2);
if (showPositionSelector)
{
var row4 = new StackLayout {
Orientation = StackOrientation.Horizontal
};
var scrollPositionSelector = new EnumSelector <ScrollToPosition>(() => _currentScrollToPosition,
type => _currentScrollToPosition = type);
row4.Children.Add(scrollPositionSelector);
layout.Children.Add(row4);
}
Content = layout;
}
