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linhdh/Button.cs

Created December 22, 2017 08:36
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  1. linhdh created this gist Dec 22, 2017.
    26 changes: 26 additions & 0 deletions Button.cs
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    using System;
    using System.Collections.Generic;
    using System.Text;
    using Xamarin.Forms;

    namespace GoiXe.CustomControls.Common
    {
    public class Button2 : Xamarin.Forms.Button
    {
    public enum TextAlignment
    {
    Start,
    End,
    Center
    }
    public string ImageLeft { get; set; }
    public string ImageRight { get; set; }
    public string ImageTop { get; set; }
    public string ImageBottom { get; set; }
    public bool IsTextUppercase { get; set; } = false;
    public TextAlignment VerticalTextAlignment { get; set; } = TextAlignment.Center;
    public TextAlignment HorizontalTextAlignment { get; set; } = TextAlignment.Start;
    public int BgResourceId { get; set; }
    public Thickness Padding { get; set; } = new Thickness(0);
    }
    }
    139 changes: 139 additions & 0 deletions ButtonRenderer.cs
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    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;

    using Android.App;
    using Android.Content;
    using Android.Content.PM;
    using Android.Content.Res;
    using Android.Graphics;
    using Android.Graphics.Drawables;
    using Android.OS;
    using Android.Runtime;
    using Android.Views;
    using Android.Widget;
    using Xamarin.Forms;
    using Xamarin.Forms.Platform.Android;
    using Xamarin.Forms.Xaml;

    [assembly: ExportRenderer(typeof(GoiXe.CustomControls.Common.Button2), typeof(GoiXe.Droid.CustomRenderers.Common.Button2Renderer))]
    namespace GoiXe.Droid.CustomRenderers.Common
    {
    class Button2Renderer : Xamarin.Forms.Platform.Android.ButtonRenderer
    {
    private Android.Widget.Button androidButton;
    private GoiXe.CustomControls.Common.Button2 myButton;

    #pragma warning disable 618
    public Button2Renderer() : base()
    #pragma warning restore 618
    {
    }

    public Button2Renderer(Context context) : base(context)
    {
    }

    protected override void OnElementChanged(ElementChangedEventArgs<Xamarin.Forms.Button> e)
    {
    base.OnElementChanged(e);
    if (Control != null)
    {
    androidButton = Control as Android.Widget.Button;
    }
    else
    {
    androidButton = CreateNativeControl();
    SetNativeControl(androidButton);
    }

    if (e.OldElement != null)
    myButton = e.OldElement as GoiXe.CustomControls.Common.Button2;
    if (e.NewElement != null)
    myButton = e.NewElement as GoiXe.CustomControls.Common.Button2;
    if (Element != null)
    myButton = Element as GoiXe.CustomControls.Common.Button2;

    androidButton.LayoutParameters.Width = LayoutParams.WrapContent;
    androidButton.SetAllCaps(myButton.IsTextUppercase);
    androidButton.SetPadding((int)myButton.Padding.Left, (int)myButton.Padding.Top, (int)myButton.Padding.Right, (int)myButton.Padding.Bottom);
    androidButton.CompoundDrawablePadding = 2;
    //androidButton.SetPaddingRelative(0, 0, 0, 0);
    switch (myButton.VerticalTextAlignment)
    {
    case CustomControls.Common.Button2.TextAlignment.Center:
    androidButton.Gravity = GravityFlags.CenterVertical;
    break;
    case CustomControls.Common.Button2.TextAlignment.Start:
    androidButton.Gravity = GravityFlags.Top;
    break;
    case CustomControls.Common.Button2.TextAlignment.End:
    androidButton.Gravity = GravityFlags.Bottom;
    break;
    default:
    break;
    }

    switch (myButton.HorizontalTextAlignment)
    {
    case CustomControls.Common.Button2.TextAlignment.Center:
    androidButton.Gravity |= GravityFlags.CenterHorizontal;
    break;
    case CustomControls.Common.Button2.TextAlignment.Start:
    androidButton.Gravity |= GravityFlags.Left;
    break;
    case CustomControls.Common.Button2.TextAlignment.End:
    androidButton.Gravity |= GravityFlags.Right;
    break;
    default:
    break;
    }
    androidButton.TextAlignment = Android.Views.TextAlignment.Gravity;
    if (myButton.BgResourceId > 0)
    androidButton.SetBackgroundResource(myButton.BgResourceId);
    else
    androidButton.SetBackgroundResource(Resource.Drawable.story_poster_button_states);
    Drawable drawableLeft = null, drawableRight = null, drawableTop = null, drawableBottom = null;
    #pragma warning disable CS0618 // Type or member is obsolete
    if (myButton.ImageLeft?.Length > 0)
    {
    /*
    int resource = Resources.GetIdentifier(myButton.ImageLeft, "drawable", Context.PackageName);
    drawableLeft = Resources.GetDrawable(resource);
    */
    string resourceName = myButton.ImageLeft.ToLower().Remove(myButton.ImageLeft.Length - 4);
    int id = (int) typeof(Resource.Drawable).GetField(resourceName).GetValue(null);
    drawableLeft = Resources.GetDrawable(id);
    }

    if (myButton.ImageRight?.Length > 0)
    {
    //int resource = Resources.GetIdentifier(myButton.ImageRight, "drawable", Context.PackageName);
    //drawableRight = Resources.GetDrawable(resource);
    string resourceName = myButton.ImageRight.ToLower().Remove(myButton.ImageRight.Length - 4);
    int id = (int)typeof(Resource.Drawable).GetField(resourceName).GetValue(null);
    drawableRight = Resources.GetDrawable(id);
    }
    if (myButton.ImageTop?.Length > 0)
    {
    //int resource = Resources.GetIdentifier(myButton.ImageTop, "drawable", Context.PackageName);
    //drawableTop = Resources.GetDrawable(resource);
    string resourceName = myButton.ImageTop.ToLower().Remove(myButton.ImageTop.Length - 4);
    int id = (int)typeof(Resource.Drawable).GetField(resourceName).GetValue(null);
    drawableTop = Resources.GetDrawable(id);
    }
    if (myButton.ImageBottom?.Length > 0)
    {
    //int resource = Resources.GetIdentifier(myButton.ImageBottom, "drawable", Context.PackageName);
    //drawableBottom = Resources.GetDrawable(resource);
    string resourceName = myButton.ImageBottom.ToLower().Remove(myButton.ImageBottom.Length - 4);
    int id = (int)typeof(Resource.Drawable).GetField(resourceName).GetValue(null);
    drawableBottom = Resources.GetDrawable(id);
    }
    #pragma warning restore CS0618 // Type or member is obsolete
    androidButton.SetCompoundDrawablesWithIntrinsicBounds(drawableLeft, drawableTop, drawableRight, drawableBottom);
    //androidButton.StateListAnimator = null;
    }
    }
    }