Add Tooltip for Chart Objects

Created at 01 May 2019, 08:56
Join Discord
AF

afhacker

Follow

Joined 15.10.2015

Add Tooltip for Chart Objects
01 May 2019, 08:56

All chart objects must have a tooltip property, so whenever the user moves the mouse over the object it should show that tooltip which is provided programmatically.

It's a very important and easy to implement feature please add it ASAP.

cTrader Automate
@afhacker
Replies

PanagiotisCharalampous
04 Nov 2019, 15:54

Hi AlgoDeveloper,

You might find the below example useful

using System;
using System.Linq;
using cAlgo.API;
using cAlgo.API.Indicators;
using cAlgo.API.Internals;
using cAlgo.Indicators;

namespace cAlgo.Robots
{
    [Robot(TimeZone = TimeZones.UTC, AccessRights = AccessRights.None)]
    public class CustomTooltip : Robot
    {
        [Parameter(DefaultValue = 0.0)]
        public double Parameter { get; set; }

        private Tooltip Tooltip;
        private double LastMouseX;
        private double LastMouseY;

        protected override void OnStart()
        {
            Tooltip = new Tooltip 
            {
                VerticalAlignment = VerticalAlignment.Top,
                HorizontalAlignment = HorizontalAlignment.Left,
                IsVisible = false,
                Width = 120,
                Height = 40
            };
            Chart.AddControl(Tooltip);

            Chart.ObjectHoverChanged += Chart_ObjectHoverChanged;
            Chart.MouseMove += Chart_MouseMove;
        }

        private void Chart_MouseMove(ChartMouseEventArgs obj)
        {
            LastMouseX = obj.MouseX;
            LastMouseY = obj.MouseY;

            if (Tooltip.IsVisible)
                UpdateTooltipCoorinates();
        }

        private void Chart_ObjectHoverChanged(ChartObjectHoverChangedEventArgs obj)
        {
            if (obj.IsObjectHovered)
                ShowTooltip(obj.ChartObject.Name);
            else
                HideTooltip();
        }

        private void ShowTooltip(string text)
        {
            Tooltip.IsVisible = true;
            Tooltip.Text = text;
            UpdateTooltipCoorinates();
        }

        private void UpdateTooltipCoorinates()
        {

            var extraDelta = 10;
            var width = Tooltip.Width;
            var height = Tooltip.Height;
            var left = Chart.Width - LastMouseX > width + extraDelta ? LastMouseX + extraDelta : LastMouseX - width - extraDelta;
            var right = Chart.Height - LastMouseY > height + extraDelta ? LastMouseY + extraDelta : LastMouseY - height - extraDelta;

            Tooltip.Margin = new Thickness(left, right, 0, 0);
        }

        private void HideTooltip()
        {
            Tooltip.IsVisible = false;
        }

        protected override void OnTick()
        {
            // Put your core logic here
        }

        protected override void OnStop()
        {
            // Put your deinitialization logic here
        }
    }

    public class Tooltip : CustomControl
    {
        public Tooltip()
        {
            var border = new Border 
            {
                BackgroundColor = "#3F3F3F",
                BorderColor = "#969696",
                BorderThickness = 1,
                CornerRadius = 5
            };

            ContentLabel = new TextBlock 
            {
                Margin = 5
            };

            border.Child = ContentLabel;
            AddChild(border);
        }

        private TextBlock ContentLabel { get; set; }

        public string Text
        {
            get { return ContentLabel.Text; }
            set { ContentLabel.Text = value; }
        }


    }
}

Best Regards,

Panagiotis

@PanagiotisCharalampous

afhacker
04 Nov 2019, 20:09

That's awesome! and very helpful.

@afhacker

afhacker
05 Nov 2019, 12:16

Production-ready tooltip control for chart objects (Not controls and for now, it only works if the chart object is interactive):

namespace cAlgo.API.Extensions.Controls
{
    public class ChartObjectTooltip : CustomControl
    {
        #region Fields

        private readonly Border _border;

        private readonly Chart _chart;

        private readonly ChartObject _chartObject;

        private double _lastMouseX, _lastMouseY;

        #endregion Fields

        public ChartObjectTooltip(Chart chart, ChartObject chartObject)
        {
            _chart = chart;
            _chartObject = chartObject;

            _border = new Border
            {
                BackgroundColor = "#3F3F3F",
                BorderColor = "#969696",
                BorderThickness = 1,
                CornerRadius = 5
            };

            AddChild(_border);

            _chart.ObjectHoverChanged += Chart_ObjectHoverChanged;
            _chart.MouseMove += Chart_MouseMove;
        }

        #region Properties

        public Color BackgroundColor
        {
            get
            {
                return _border.BackgroundColor;
            }
            set
            {
                _border.BackgroundColor = value;
            }
        }

        public Color BorderColor
        {
            get
            {
                return _border.BorderColor;
            }
            set
            {
                _border.BorderColor = value;
            }
        }

        public Thickness BorderThickness
        {
            get
            {
                return _border.BorderThickness;
            }
            set
            {
                _border.BorderThickness = value;
            }
        }

        public CornerRadius CornerRadius
        {
            get
            {
                return _border.CornerRadius;
            }
            set
            {
                _border.CornerRadius = value;
            }
        }

        public ControlBase Content
        {
            get
            {
                return _border.Child;
            }
            set
            {
                _border.Child = value;
            }
        }

        #endregion Properties

        #region Methods

        private void Chart_ObjectHoverChanged(ChartObjectHoverChangedEventArgs obj)
        {
            if (obj.IsObjectHovered && obj.ChartObject == _chartObject)
            {
                UpdateCoorinates();

                IsVisible = true;
            }
            else
            {
                IsVisible = false;
            }
        }

        private void Chart_MouseMove(ChartMouseEventArgs obj)
        {
            _lastMouseX = obj.MouseX;
            _lastMouseY = obj.MouseY;

            if (IsVisible)
            {
                UpdateCoorinates();
            }
        }

        private void UpdateCoorinates()
        {
            var extraDelta = 10;
            var width = Width;
            var height = Height;
            var left = _chart.Width - _lastMouseX > width + extraDelta ? _lastMouseX + extraDelta : _lastMouseX - width - extraDelta;
            var right = _chart.Height - _lastMouseY > height + extraDelta ? _lastMouseY + extraDelta : _lastMouseY - height - extraDelta;

            Margin = new Thickness(left, right, 0, 0);
        }

        #endregion Methods
    }
}

 

@afhacker

snowchilli
13 Nov 2019, 02:55

RE:

Panagiotis Charalampous said:

Hi AlgoDeveloper,

You might find the below example useful

using System;
using System.Linq;
using cAlgo.API;
using cAlgo.API.Indicators;
using cAlgo.API.Internals;
using cAlgo.Indicators;

namespace cAlgo.Robots
{
    [Robot(TimeZone = TimeZones.UTC, AccessRights = AccessRights.None)]
    public class CustomTooltip : Robot
    {
        [Parameter(DefaultValue = 0.0)]
        public double Parameter { get; set; }

        private Tooltip Tooltip;
        private double LastMouseX;
        private double LastMouseY;

        protected override void OnStart()
        {
            Tooltip = new Tooltip 
            {
                VerticalAlignment = VerticalAlignment.Top,
                HorizontalAlignment = HorizontalAlignment.Left,
                IsVisible = false,
                Width = 120,
                Height = 40
            };
            Chart.AddControl(Tooltip);

            Chart.ObjectHoverChanged += Chart_ObjectHoverChanged;
            Chart.MouseMove += Chart_MouseMove;
        }

        private void Chart_MouseMove(ChartMouseEventArgs obj)
        {
            LastMouseX = obj.MouseX;
            LastMouseY = obj.MouseY;

            if (Tooltip.IsVisible)
                UpdateTooltipCoorinates();
        }

        private void Chart_ObjectHoverChanged(ChartObjectHoverChangedEventArgs obj)
        {
            if (obj.IsObjectHovered)
                ShowTooltip(obj.ChartObject.Name);
            else
                HideTooltip();
        }

        private void ShowTooltip(string text)
        {
            Tooltip.IsVisible = true;
            Tooltip.Text = text;
            UpdateTooltipCoorinates();
        }

        private void UpdateTooltipCoorinates()
        {

            var extraDelta = 10;
            var width = Tooltip.Width;
            var height = Tooltip.Height;
            var left = Chart.Width - LastMouseX > width + extraDelta ? LastMouseX + extraDelta : LastMouseX - width - extraDelta;
            var right = Chart.Height - LastMouseY > height + extraDelta ? LastMouseY + extraDelta : LastMouseY - height - extraDelta;

            Tooltip.Margin = new Thickness(left, right, 0, 0);
        }

        private void HideTooltip()
        {
            Tooltip.IsVisible = false;
        }

        protected override void OnTick()
        {
            // Put your core logic here
        }

        protected override void OnStop()
        {
            // Put your deinitialization logic here
        }
    }

    public class Tooltip : CustomControl
    {
        public Tooltip()
        {
            var border = new Border 
            {
                BackgroundColor = "#3F3F3F",
                BorderColor = "#969696",
                BorderThickness = 1,
                CornerRadius = 5
            };

            ContentLabel = new TextBlock 
            {
                Margin = 5
            };

            border.Child = ContentLabel;
            AddChild(border);
        }

        private TextBlock ContentLabel { get; set; }

        public string Text
        {
            get { return ContentLabel.Text; }
            set { ContentLabel.Text = value; }
        }


    }
}

Best Regards,

Panagiotis

Building the above code (as is) gives me 3 errors
Error CS0246: The type or namespace name 'CustomControl' could not be found (are you missing a using directive or an assembly reference?)

Error CS0122: 'cAlgo.API.TextBlock' is inaccessible due to its protection level

Error CS0053: Inconsistent accessibility: property type 'cAlgo.API.TextBlock' is less accessible than property 'cAlgo.Robots.Tooltip.ContentLabel'

Am I missing references? What else am I missing?

@snowchilli

PanagiotisCharalampous
13 Nov 2019, 09:05

Hi snowchilli,

Thank you for posting in our forum. Do you use v3.6 to build this cBot?

Best Regards,

Panagiotis

@PanagiotisCharalampous

noppanon
09 Apr 2021, 11:46

RE:

PanagiotisCharalampous said:

Hi AlgoDeveloper,

You might find the below example useful

using System;
using System.Linq;
using cAlgo.API;
using cAlgo.API.Indicators;
using cAlgo.API.Internals;
using cAlgo.Indicators;

namespace cAlgo.Robots
{
    [Robot(TimeZone = TimeZones.UTC, AccessRights = AccessRights.None)]
    public class CustomTooltip : Robot
    {
        [Parameter(DefaultValue = 0.0)]
        public double Parameter { get; set; }

        private Tooltip Tooltip;
        private double LastMouseX;
        private double LastMouseY;

        protected override void OnStart()
        {
            Tooltip = new Tooltip 
            {
                VerticalAlignment = VerticalAlignment.Top,
                HorizontalAlignment = HorizontalAlignment.Left,
                IsVisible = false,
                Width = 120,
                Height = 40
            };
            Chart.AddControl(Tooltip);

            Chart.ObjectHoverChanged += Chart_ObjectHoverChanged;
            Chart.MouseMove += Chart_MouseMove;
        }

        private void Chart_MouseMove(ChartMouseEventArgs obj)
        {
            LastMouseX = obj.MouseX;
            LastMouseY = obj.MouseY;

            if (Tooltip.IsVisible)
                UpdateTooltipCoorinates();
        }

        private void Chart_ObjectHoverChanged(ChartObjectHoverChangedEventArgs obj)
        {
            if (obj.IsObjectHovered)
                ShowTooltip(obj.ChartObject.Name);
            else
                HideTooltip();
        }

        private void ShowTooltip(string text)
        {
            Tooltip.IsVisible = true;
            Tooltip.Text = text;
            UpdateTooltipCoorinates();
        }

        private void UpdateTooltipCoorinates()
        {

            var extraDelta = 10;
            var width = Tooltip.Width;
            var height = Tooltip.Height;
            var left = Chart.Width - LastMouseX > width + extraDelta ? LastMouseX + extraDelta : LastMouseX - width - extraDelta;
            var right = Chart.Height - LastMouseY > height + extraDelta ? LastMouseY + extraDelta : LastMouseY - height - extraDelta;

            Tooltip.Margin = new Thickness(left, right, 0, 0);
        }

        private void HideTooltip()
        {
            Tooltip.IsVisible = false;
        }

        protected override void OnTick()
        {
            // Put your core logic here
        }

        protected override void OnStop()
        {
            // Put your deinitialization logic here
        }
    }

    public class Tooltip : CustomControl
    {
        public Tooltip()
        {
            var border = new Border 
            {
                BackgroundColor = "#3F3F3F",
                BorderColor = "#969696",
                BorderThickness = 1,
                CornerRadius = 5
            };

            ContentLabel = new TextBlock 
            {
                Margin = 5
            };

            border.Child = ContentLabel;
            AddChild(border);
        }

        private TextBlock ContentLabel { get; set; }

        public string Text
        {
            get { return ContentLabel.Text; }
            set { ContentLabel.Text = value; }
        }


    }
}

Best Regards,

Panagiotis

 

Hi Panagiotis,

   I'm using the latest cTrader 4.0.   On your sample, I found that event ObjectHoverChanged does not fired, but MouseMove does fired. Is there anything missing?

Regards,

Noppanon

 

@noppanon

PanagiotisCharalampous
09 Apr 2021, 11:59

Hi Noppanon,

How did you come to this conclusion? It works fine for me.

Best Regards,

Panagiotis 

Join us on Telegram

@PanagiotisCharalampous
Copyright © 2025 Spotware Systems Ltd. All rights reserved.
cTrader Ltd offers through its group of companies the cTrader platform. The information on this website is for general informational purposes only and does not constitute financial or investment advice. cTrader does not solicit retail investors. Reliance on this information is at your own risk.