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Fix AspectRatioTrigger

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This commit is contained in:
Jérôme Laban 2019-05-17 10:53:10 -04:00
commit 8559c576d6
1 changed files with 121 additions and 101 deletions
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222
src/Calculator.Shared/Views/StateTriggers/AspectRatioTrigger.cs
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@ -14,126 +14,146 @@ using Windows.UI.Xaml;
namespace CalculatorApp.Views.StateTriggers
{
public enum Aspect
{
Height,
Width
}
public enum Aspect
{
Height,
Width
}
public sealed class AspectRatioTrigger : Windows.UI.Xaml.StateTriggerBase
{
/* The source for which this class will respond to size changed events. */
public FrameworkElement Source
{
get { return (FrameworkElement)GetValue(SourceProperty); }
set { SetValue(SourceProperty, value); }
}
public sealed class AspectRatioTrigger : Windows.UI.Xaml.StateTriggerBase
{
/* The source for which this class will respond to size changed events. */
public FrameworkElement Source
{
get { return (FrameworkElement)GetValue(SourceProperty); }
set { SetValue(SourceProperty, value); }
}
public static readonly DependencyProperty SourceProperty =
DependencyProperty.Register("Source", typeof(FrameworkElement), typeof(AspectRatioTrigger), new PropertyMetadata(null));
public static readonly DependencyProperty SourceProperty =
DependencyProperty.Register(
name: nameof(Source),
propertyType: typeof(FrameworkElement),
ownerType: typeof(AspectRatioTrigger),
typeMetadata: new PropertyMetadata(
defaultValue: null,
propertyChangedCallback: (s, e) => (s as AspectRatioTrigger)?.OnSourcePropertyChanged(e.OldValue as FrameworkElement, e.NewValue as FrameworkElement))
);
/* Either Height or Width. The property will determine which aspect is used as the numerator when calculating
/* Either Height or Width. The property will determine which aspect is used as the numerator when calculating
the aspect ratio. */
public Aspect NumeratorAspect
{
get { return (Aspect)GetValue(NumeratorAspectProperty); }
set { SetValue(NumeratorAspectProperty, value); }
}
public Aspect NumeratorAspect
{
get { return (Aspect)GetValue(NumeratorAspectProperty); }
set { SetValue(NumeratorAspectProperty, value); }
}
// Using a DependencyProperty as the backing store for NumeratorAspect. This enables animation, styling, binding, etc...
public static readonly DependencyProperty NumeratorAspectProperty =
DependencyProperty.Register("NumeratorAspect", typeof(Aspect), typeof(AspectRatioTrigger), new PropertyMetadata(Aspect.Height));
// Using a DependencyProperty as the backing store for NumeratorAspect. This enables animation, styling, binding, etc...
public static readonly DependencyProperty NumeratorAspectProperty =
DependencyProperty.Register(
name: "NumeratorAspect",
propertyType: typeof(Aspect),
ownerType: typeof(AspectRatioTrigger),
typeMetadata: new PropertyMetadata(Aspect.Height)
);
/* The threshold that will cause the trigger to fire when the aspect ratio exceeds this value. */
public double Threshold
{
get { return (double)GetValue(ThresholdProperty); }
set { SetValue(ThresholdProperty, value); }
}
/* The threshold that will cause the trigger to fire when the aspect ratio exceeds this value. */
public double Threshold
{
get { return (double)GetValue(ThresholdProperty); }
set { SetValue(ThresholdProperty, value); }
}
// Using a DependencyProperty as the backing store for Threshold. This enables animation, styling, binding, etc...
public static readonly DependencyProperty ThresholdProperty =
DependencyProperty.Register("Threshold", typeof(double), typeof(AspectRatioTrigger), new PropertyMetadata(0.0));
// Using a DependencyProperty as the backing store for Threshold. This enables animation, styling, binding, etc...
public static readonly DependencyProperty ThresholdProperty =
DependencyProperty.Register(
name: "Threshold",
propertyType: typeof(double),
ownerType: typeof(AspectRatioTrigger),
typeMetadata: new PropertyMetadata(0.0)
);
/* If true, the trigger will fire if the aspect ratio is greater than or equal to the threshold. */
public bool ActiveIfEqual
{
get { return (bool)GetValue(ActiveIfEqualProperty); }
set { SetValue(ActiveIfEqualProperty, value); }
}
// Using a DependencyProperty as the backing store for ActiveIfEqual. This enables animation, styling, binding, etc...
public static readonly DependencyProperty ActiveIfEqualProperty =
DependencyProperty.Register(
name: "ActiveIfEqual",
propertyType: typeof(bool),
ownerType: typeof(AspectRatioTrigger),
typeMetadata: new PropertyMetadata(false)
);
AspectRatioTrigger()
{
SetActive(false);
}
/* If true, the trigger will fire if the aspect ratio is greater than or equal to the threshold. */
public bool ActiveIfEqual
{
get { return (bool)GetValue(ActiveIfEqualProperty); }
set { SetValue(ActiveIfEqualProperty, value); }
}
void OnSourcePropertyChanged(FrameworkElement oldValue, FrameworkElement newValue)
{
UnregisterSizeChanged(oldValue);
RegisterSizeChanged(newValue);
}
// Using a DependencyProperty as the backing store for ActiveIfEqual. This enables animation, styling, binding, etc...
public static readonly DependencyProperty ActiveIfEqualProperty =
DependencyProperty.Register("ActiveIfEqual", typeof(bool), typeof(AspectRatioTrigger), new PropertyMetadata(false));
void RegisterSizeChanged(FrameworkElement element)
{
if (element == null)
{
return;
}
if (element != Source)
{
UnregisterSizeChanged(Source);
}
AspectRatioTrigger()
{
SetActive(false);
}
element.SizeChanged += OnSizeChanged;
}
void OnSourcePropertyChanged(FrameworkElement oldValue, FrameworkElement newValue)
{
UnregisterSizeChanged(oldValue);
RegisterSizeChanged(newValue);
}
void UnregisterSizeChanged(FrameworkElement element)
{
if (element != null)
{
element.SizeChanged -= OnSizeChanged;
}
}
void RegisterSizeChanged(FrameworkElement element)
{
if (element == null)
{
return;
}
void OnSizeChanged(object sender, SizeChangedEventArgs e)
{
UpdateIsActive(e.NewSize);
}
if (element != Source)
{
UnregisterSizeChanged(Source);
}
void UpdateIsActive(Size sourceSize)
{
double numerator, denominator;
if (NumeratorAspect == Aspect.Height)
{
numerator = sourceSize.Height;
denominator = sourceSize.Width;
}
else
{
numerator = sourceSize.Width;
denominator = sourceSize.Height;
}
element.SizeChanged += OnSizeChanged;
}
bool isActive = false;
if (denominator > 0)
{
double ratio = numerator / denominator;
double threshold = Math.Abs(Threshold);
void UnregisterSizeChanged(FrameworkElement element)
{
if (element != null)
{
element.SizeChanged -= OnSizeChanged;
}
}
isActive = ((ratio > threshold) || (ActiveIfEqual && (ratio == threshold)));
}
void OnSizeChanged(object sender, SizeChangedEventArgs e)
{
UpdateIsActive(e.NewSize);
}
SetActive(isActive);
}
void UpdateIsActive(Size sourceSize)
{
double numerator, denominator;
if (NumeratorAspect == Aspect.Height)
{
numerator = sourceSize.Height;
denominator = sourceSize.Width;
}
else
{
numerator = sourceSize.Width;
denominator = sourceSize.Height;
}
bool isActive = false;
if (denominator > 0)
{
double ratio = numerator / denominator;
double threshold = Math.Abs(Threshold);
isActive = ((ratio > threshold) || (ActiveIfEqual && (ratio == threshold)));
}
SetActive(isActive);
}
}
}
}