Adding left and right full swipe gesture on listview using xamarin forms - xamarin

Question

Currently i have a listview which stores the medications of my users, i want to implement a swipe gesture so that the user can simply swipe left or right to tell if the medication has been taken or not taken.
Is there a way to add a left and right full swipe gesture in a listview just like the way that apple has implemented in their mail.

Answer 1

Note:it cannot achieved moved item follow with fingertip, but could achieved left and right gestures
First, you should build swipe compoment using gesture
SwipeGestureGrid.cs
public class SwipeGestureGrid : Grid
{
#region Private Member
private double _gestureX { get; set; }
private double _gestureY { get; set; }
private bool IsSwipe { get; set; }
#endregion
#region Public Member
#region Events
#region Tapped
public event EventHandler Tapped;
protected void OnTapped(EventArgs e)
{
if (Tapped != null)
Tapped(this, e);
}
#endregion
#region SwipeUP
public event EventHandler SwipeUP;
protected void OnSwipeUP(EventArgs e)
{
if (SwipeUP != null)
SwipeUP(this, e);
}
#endregion
#region SwipeDown
public event EventHandler SwipeDown;
protected void OnSwipeDown(EventArgs e)
{
if (SwipeDown != null)
SwipeDown(this, e);
}
#endregion
#region SwipeRight
public event EventHandler SwipeRight;
protected void OnSwipeRight(EventArgs e)
{
if (SwipeRight != null)
SwipeRight(this, e);
}
#endregion
#region SwipeLeft
public event EventHandler SwipeLeft;
protected void OnSwipeLeft(EventArgs e)
{
if (SwipeLeft != null)
SwipeLeft(this, e);
}
#endregion
#endregion
public double Height
{
get
{
return HeightRequest;
}
set
{
HeightRequest = value;
}
}
public double Width
{
get
{
return WidthRequest;
}
set
{
WidthRequest = value;
}
}
#endregion
public SwipeGestureGrid()
{
PanGestureRecognizer panGesture = new PanGestureRecognizer();
panGesture.PanUpdated += PanGesture_PanUpdated;
TapGestureRecognizer tapGesture = new TapGestureRecognizer();
tapGesture.Tapped += TapGesture_Tapped;
GestureRecognizers.Add(panGesture);
GestureRecognizers.Add(tapGesture);
}
private void TapGesture_Tapped(object sender, EventArgs e)
{
try
{
if (!IsSwipe)
OnTapped(null);
IsSwipe = false;
}
catch (Exception ex)
{
}
}
private void PanGesture_PanUpdated(object sender, PanUpdatedEventArgs e)
{
try
{
switch (e.StatusType)
{
case GestureStatus.Running:
{
_gestureX = e.TotalX;
_gestureY = e.TotalY;
}
break;
case GestureStatus.Completed:
{
IsSwipe = true;
//Debug.WriteLine("{0} {1}", _gestureX, _gestureY);
if (Math.Abs(_gestureX) > Math.Abs(_gestureY))
{
if (_gestureX > 0)
{
OnSwipeRight(null);
}
else
{
OnSwipeLeft(null);
}
}
else
{
if (_gestureY > 0)
{
OnSwipeDown(null);
}
else
{
OnSwipeUP(null);
}
}
}
break;
}
}
catch (Exception ex)
{
}
}
}
Next using datatemplate in listview andattach event for GesturecompomentPage.cs
ListView lsvData = new ListView()
{
VerticalOptions = LayoutOptions.Fill,
HorizontalOptions = LayoutOptions.Fill,
BackgroundColor = Color.White,
HasUnevenRows = true,
};
List<string> lstData = new List<string>();
public Pages()
{
#region DataTemplate
DataTemplate ListDataTemplate = new DataTemplate(() =>
{
#region DataArea of Template
SwipeGestureGrid gridData = new SwipeGestureGrid()
{
HorizontalOptions = LayoutOptions.FillAndExpand,
VerticalOptions = LayoutOptions.FillAndExpand,
HeightRequest = 60,
RowDefinitions =
{
new RowDefinition { },
},
ColumnDefinitions =
{
new ColumnDefinition { },
}
};
#endregion
#region Base of Template
Grid gridBase = new Grid()
{
HorizontalOptions = LayoutOptions.FillAndExpand,
VerticalOptions = LayoutOptions.FillAndExpand,
HeightRequest = 60,
RowDefinitions =
{
new RowDefinition { },
},
ColumnDefinitions =
{
new ColumnDefinition { },
//Put Cells Data here
new ColumnDefinition { Width = new GridLength(0,
GridUnitType.Absolute)}, //Button for Cells here
},
};
#endregion
Label lblText = new Label
{
HorizontalOptions = LayoutOptions.FillAndExpand,
VerticalOptions = LayoutOptions.FillAndExpand,
FontAttributes = FontAttributes.Bold,
VerticalTextAlignment = TextAlignment.End,
TextColor = Color.Black,
BackgroundColor = Color.Silver,
LineBreakMode = LineBreakMode.TailTruncation,
FontSize = 18,
};
lblText.SetBinding(Label.TextProperty, ".");
ImageButton btnCellDelete = new ImageButton() { Source = "Delete" };
gridData.Children.Add(lblText, 0, 0);
gridBase.Children.Add(gridData, 0, 0);
gridBase.Children.Add(btnCellDelete, 1, 0);
gridData.SwipeLeft += GridTemplate_SwipeLeft;
gridData.SwipeRight += GridTemplate_SwipeRight; ;
gridData.Tapped += GridTemplate_Tapped; ;
btnCellDelete.Clicked += BtnCellDelete_Clicked; ;
return new ViewCell
{
View = gridBase,
Height = 60,
};
});
#endregion
for (int i = 1; i <= 100; i++)
{
lstData.Add(i.ToString());
}
lsvData.ItemTemplate = ListDataTemplate;
lsvData.ItemsSource = lstData;
Content = lsvData;
}
Add the event.SwipeLeft to show DeleteButton
private void GridTemplate_SwipeLeft(object sender, EventArgs e)
{
try
{
if (sender is SwipeGestureGrid)
{
var templateGrid = ((SwipeGestureGrid)sender).Parent;
if (templateGrid != null && templateGrid is Grid)
{
var CellTemplateGrid = (Grid)templateGrid;
CellTemplateGrid.ColumnDefinitions[1].Width = new GridLength(60, GridUnitType.Absolute);
}
}
}
catch (Exception ex)
{
}
}
swiperight to hide delete button
private void GridTemplate_SwipeRight(object sender, EventArgs e)
{
try
{
if (sender is SwipeGestureGrid)
{
var templateGrid = ((SwipeGestureGrid)sender).Parent;
if (templateGrid != null && templateGrid is Grid)
{
var CellTemplateGrid = (Grid)templateGrid;
CellTemplateGrid.ColumnDefinitions[1].Width = new GridLength(0, GridUnitType.Absolute);
}
}
}
catch (Exception ex)
{
}
}
Delete button click event
private void BtnCellDelete_Clicked(object sender, EventArgs e)
{
try
{
if (sender is ImageButton)
{
var templateGrid = ((ImageButton)sender);
//templateGrid.Parent = gridBase
//templateGrid.Parent.Parent = cell
if (templateGrid.Parent != null && templateGrid.Parent.Parent != null && templateGrid.Parent.Parent.BindingContext != null && templateGrid.Parent.Parent.BindingContext is string)
{
var deletedate = templateGrid.Parent.Parent.BindingContext as string;
lstData.RemoveAll(f => f == deletedate);
lsvData.ItemsSource = null;
lsvData.ItemsSource = lstData;
}
}
}
catch (Exception ex)
{
}
}
There is all code.
https://github.com/act70255/ListViewSwipeGesture

Answer 2

I will create a listview with a custom cells
https://learn.microsoft.com/en-us/xamarin/xamarin-forms/user-interface/listview/customizing-cell-appearance
and i add swipe left and right gestures on a grid inside to a ViewCell
https://learn.microsoft.com/en-us/xamarin/xamarin-forms/app-fundamentals/gestures/swipe
on left swipe i expand with animation something like a grid column where on start the width is 0 and after swap animated to some width. Same with right swipe.
Check for the animation the OnExpandExchange() method from here
https://github.com/xamarinium/FlippingAndResizableUI/blob/master/FlippingAndResizableView/BitcoinView.xaml.cs