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using System;
using System.ComponentModel;
using Android.Content.Res;
using Android.Text;
using Android.Text.Method;
using Android.Util;
using Android.Views;
using Java.Lang;
using Xamarin.Forms.Internals;
using Xamarin.Forms.PlatformConfiguration.AndroidSpecific;
namespace Xamarin.Forms.Platform.Android
{
public class EditorRenderer : ViewRenderer<Editor, FormsEditText>, ITextWatcher
{
ColorStateList _defaultColors;
bool _disposed;
public EditorRenderer()
{
AutoPackage = false;
}
IEditorController ElementController => Element;
void ITextWatcher.AfterTextChanged(IEditable s)
{
}
void ITextWatcher.BeforeTextChanged(ICharSequence s, int start, int count, int after)
{
}
void ITextWatcher.OnTextChanged(ICharSequence s, int start, int before, int count)
{
if (string.IsNullOrEmpty(Element.Text) && s.Length() == 0)
return;
if (Element.Text != s.ToString())
((IElementController)Element).SetValueFromRenderer(Editor.TextProperty, s.ToString());
}
protected override FormsEditText CreateNativeControl()
{
return new FormsEditText(Context);
}
protected override void OnElementChanged(ElementChangedEventArgs<Editor> e)
{
base.OnElementChanged(e);
HandleKeyboardOnFocus = true;
FormsEditText edit = Control;
if (edit == null)
{
edit = CreateNativeControl();
SetNativeControl(edit);
edit.AddTextChangedListener(this);
edit.OnKeyboardBackPressed += OnKeyboardBackPressed;
}
edit.SetSingleLine(false);
edit.Gravity = GravityFlags.Top;
edit.SetHorizontallyScrolling(false);
UpdateText();
UpdateInputType();
UpdateTextColor();
UpdateFont();
}
protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
if (e.PropertyName == Editor.TextProperty.PropertyName)
UpdateText();
else if (e.PropertyName == InputView.KeyboardProperty.PropertyName)
UpdateInputType();
else if (e.PropertyName == Editor.TextColorProperty.PropertyName)
UpdateTextColor();
else if (e.PropertyName == Editor.FontAttributesProperty.PropertyName)
UpdateFont();
else if (e.PropertyName == Editor.FontFamilyProperty.PropertyName)
UpdateFont();
else if (e.PropertyName == Editor.FontSizeProperty.PropertyName)
UpdateFont();
base.OnElementPropertyChanged(sender, e);
}
protected override void Dispose(bool disposing)
{
if (_disposed)
{
return;
}
_disposed = true;
if (disposing)
{
if (Control != null)
{
Control.OnKeyboardBackPressed -= OnKeyboardBackPressed;
}
}
base.Dispose(disposing);
}
protected virtual NumberKeyListener GetDigitsKeyListener(InputTypes inputTypes)
{
// Override this in a custom renderer to use a different NumberKeyListener
// or to filter out input types you don't want to allow
// (e.g., inputTypes &= ~InputTypes.NumberFlagSigned to disallow the sign)
return LocalizedDigitsKeyListener.Create(inputTypes);
}
internal override void OnNativeFocusChanged(bool hasFocus)
{
if (Element.IsFocused && !hasFocus) // Editor has requested an unfocus, fire completed event
ElementController.SendCompleted();
}
void UpdateFont()
{
Control.Typeface = Element.ToTypeface();
Control.SetTextSize(ComplexUnitType.Sp, (float)Element.FontSize);
}
void UpdateInputType()
{
Editor model = Element;
FormsEditText edit = Control;
var keyboard = model.Keyboard;
edit.InputType = keyboard.ToInputType() | InputTypes.TextFlagMultiLine;
if (keyboard == Keyboard.Numeric)
{
edit.KeyListener = GetDigitsKeyListener(edit.InputType);
}
}
void UpdateText()
{
string newText = Element.Text ?? "";
if (Control.Text == newText)
return;
Control.Text = newText;
Control.SetSelection(newText.Length);
}
void UpdateTextColor()
{
if (Element.TextColor.IsDefault)
{
if (_defaultColors == null)
{
// This control has always had the default colors; nothing to update
return;
}
// This control is being set back to the default colors
Control.SetTextColor(_defaultColors);
}
else
{
if (_defaultColors == null)
{
// Keep track of the default colors so we can return to them later
// and so we can preserve the default disabled color
_defaultColors = Control.TextColors;
}
Control.SetTextColor(Element.TextColor.ToAndroidPreserveDisabled(_defaultColors));
}
}
void OnKeyboardBackPressed(object sender, EventArgs eventArgs)
{
ElementController?.SendCompleted();
Control?.ClearFocus();
}
}
}
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