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using System.Collections.Generic;
using System.Windows.Input;
using Xamarin.PropertyEditing.Common;
using Xamarin.PropertyEditing.Drawing;
namespace Xamarin.PropertyEditing.ViewModels
{
internal class AutoResizingPropertyViewModel
: PropertyViewModel<AutoResizingFlags>
{
public AutoResizingPropertyViewModel (TargetPlatform platform, IPropertyInfo property, IEnumerable<IObjectEditor> editors, PropertyVariation variation = null)
: base (platform, property, editors, variation)
{
ToggleMaskCommand = new RelayCommand<AutoResizingFlags> (ToggleFlag);
CycleSizingCommand = new RelayCommand (OnCycleSizing);
}
public ICommand ToggleMaskCommand
{
get;
}
public ICommand CycleSizingCommand
{
get;
}
public bool LeftMarginFixed
{
get => (Value & AutoResizingFlags.FlexibleLeftMargin) != AutoResizingFlags.FlexibleLeftMargin;
set => SetFlag (AutoResizingFlags.FlexibleLeftMargin, !value);
}
public bool RightMarginFixed
{
get => (Value & AutoResizingFlags.FlexibleRightMargin) != AutoResizingFlags.FlexibleRightMargin;
set => SetFlag (AutoResizingFlags.FlexibleRightMargin, !value);
}
public bool TopMarginFixed
{
get => (Value & AutoResizingFlags.FlexibleTopMargin) != AutoResizingFlags.FlexibleTopMargin;
set => SetFlag (AutoResizingFlags.FlexibleTopMargin, !value);
}
public bool BottomMarginFixed
{
get => (Value & AutoResizingFlags.FlexibleBottomMargin) != AutoResizingFlags.FlexibleBottomMargin;
set => SetFlag (AutoResizingFlags.FlexibleBottomMargin, !value);
}
public bool HeightSizable
{
get => (Value & AutoResizingFlags.FlexibleHeight) == AutoResizingFlags.FlexibleHeight;
set => SetFlag (AutoResizingFlags.FlexibleHeight, value);
}
public bool WidthSizable
{
get => (Value & AutoResizingFlags.FlexibleWidth) == AutoResizingFlags.FlexibleWidth;
set => SetFlag (AutoResizingFlags.FlexibleWidth, value);
}
public CommonRectangle GetPreviewElementRectangle (CommonSize window, AutoResizingFlags flags)
{
const int Offset = 5;
const double multiplier = .75;
double width = 10, height = 10;
double left;
bool fixedLeft = !flags.HasFlag (AutoResizingFlags.FlexibleLeftMargin),
fixedRight = !flags.HasFlag (AutoResizingFlags.FlexibleRightMargin);
if (fixedLeft)
left = Offset;
else if (fixedRight)
left = window.Width - Offset - width;
else
left = (window.Width / 2) - (width / 2);
if (flags.HasFlag (AutoResizingFlags.FlexibleWidth)) {
if (fixedRight && fixedLeft) {
width = window.Width - (Offset * 2);
} else if (fixedRight) {
left = window.Width - (window.Width * multiplier);
width = window.Width - left - Offset;
} else if (fixedLeft) {
width = (window.Width * multiplier) - Offset;
} else {
width = window.Width * multiplier;
left = (window.Width - width) / 2;
}
}
double top;
bool fixedTop = !flags.HasFlag (AutoResizingFlags.FlexibleTopMargin),
fixedBottom = !flags.HasFlag (AutoResizingFlags.FlexibleBottomMargin);
if (fixedTop)
top = Offset;
else if (fixedBottom)
top = window.Height - Offset - height;
else
top = (window.Height / 2) - (height / 2);
if (flags.HasFlag (AutoResizingFlags.FlexibleHeight)) {
if (fixedBottom && fixedTop) {
height = window.Height - (Offset * 2);
} else if (fixedBottom) {
top = window.Height - (window.Height * multiplier);
height = window.Height - top - Offset;
} else if (fixedTop) {
height = (window.Height * multiplier) - Offset;
} else {
height = window.Height * multiplier;
top = (window.Height - height) / 2;
}
}
return new CommonRectangle (left, top, width, height);
}
protected override void OnValueChanged ()
{
base.OnValueChanged ();
OnPropertyChanged (nameof(LeftMarginFixed));
OnPropertyChanged (nameof(RightMarginFixed));
OnPropertyChanged (nameof(TopMarginFixed));
OnPropertyChanged (nameof(BottomMarginFixed));
OnPropertyChanged (nameof(HeightSizable));
OnPropertyChanged (nameof(WidthSizable));
}
private void SetFlag (AutoResizingFlags flag, bool set)
{
Value = (set) ? Value | flag : Value & ~flag;
}
private void ToggleFlag (AutoResizingFlags flag)
{
Value = Value ^ flag;
}
private void OnCycleSizing ()
{
if (!WidthSizable && !HeightSizable) {
WidthSizable = true;
} else if (WidthSizable && !HeightSizable) {
HeightSizable = true;
} else if (WidthSizable && HeightSizable) {
WidthSizable = false;
} else if (!WidthSizable && HeightSizable) {
HeightSizable = false;
}
}
}
}
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