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Custom Gauge Controls for Windows Phone 7: Part II

, 25 Feb 2013
This article is the second in the series that describes a set of gauge controls for WP7.
GaugeLibV2-noexe.zip
GaugeLib
GaugeLib.csproj.user
Properties
Themes
GaugeLibV2.zip
Bin
Debug
GaugeLib.dll
GaugeLib.pdb
Release
GaugeLib.csproj.user
WPScadaControls.zip
WPScadaControls
WPClientV2
ApplicationIcon.png
Background.png
Bin
Debug
ApplicationIcon.png
Background.png
WPClientV2.dll
WPClientV2.xap
WPScadaControlsV2.dll
Release
obj
Debug
TempPE
Properties
SplashScreenImage.jpg
WPClientV2.csproj.user
WPScadaControlsV2
Bin
Debug
WPScadaControlsV2.dll
Release
obj
Debug
TempPE
Themes
Properties
ScaleDiagram.cd
Themes
WPScadaControlsV2.csproj.user
using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Diagnostics;

namespace WPScadaControlsV2
{
    public class LinearBarIndicator:BarIndicator
    {
        public LinearBarIndicator()
        {
            DefaultStyleKey = typeof(LinearBarIndicator);
        }

        protected override void OnValueChanged(double newVal, double oldVal)
        {
            //every time the value changes set the width and the hight of
            //the indicator.
            //setting these properties will trigger the measure and arrange passes
            LinearScale scale = Owner as LinearScale;
            if (scale != null)
            {
                Size sz = GetIndicatorSize(scale);
                Debug.WriteLine("val changed: "+sz);
                Width = sz.Width;
                Height = sz.Height;
            }
        }
        protected override Size MeasureOverride(Size availableSize)
        {
            //call the base version to set the owner
            base.MeasureOverride(availableSize);
            Size size = new Size();
            //get the desired size of the indicator based on the owner size
            LinearScale owner = Owner as LinearScale;
            if (owner != null)
            {
                size = GetIndicatorSize(owner);
            }
            return size;
        }
        protected override Size ArrangeOverride(Size arrangeBounds)
        {//with every arrange pass the size of the indicator should 
            //be set again. this is important if the orientation is
            //vertical as the start position changes every time the value changes
            //so the indicator should be rearranged
            LinearScale scale = Owner as LinearScale;
            Size sz = base.ArrangeOverride(arrangeBounds);
            if (scale != null)
            {
                //reset the indicator size after each arrange phase
                sz = GetIndicatorSize(scale);
                Width = sz.Width;
                Height = sz.Height;
                Point pos = scale.GetIndicatorOffset(this);
                TranslateTransform tt = new TranslateTransform();
                tt.X = pos.X;
                tt.Y = pos.Y;
                this.RenderTransform = tt;
            }
            return sz;
        }
        private Size GetIndicatorSize(LinearScale owner)
        {//gets the size of the indicator based on the current value and the
            //owner dimensions
            double width = 0, height = 0;
            if (owner.Orientation == Orientation.Horizontal)
            {
                height = BarThickness;
                width = GetExtent(owner.ActualWidth, Value, owner.Maximum, owner.Minimum);
            }
            else
            {
                width = BarThickness;
                height = GetExtent(owner.ActualHeight, Value, owner.Maximum, owner.Minimum);
            }
            return new Size(width, height);
        }
        
        //gets the length the indicator should have
        private double GetExtent(double length, double value, double max, double min)
        {
            return length * (value - min) / (max - min);
        }

    }
}

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About the Author

Florin Badea
Software Developer
Romania Romania
No Biography provided

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