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Diffstat (limited to 'Xamarin.Forms.Core/MasterDetailPage.cs')
| -rw-r--r-- | Xamarin.Forms.Core/MasterDetailPage.cs | 229 |
1 files changed, 229 insertions, 0 deletions
diff --git a/Xamarin.Forms.Core/MasterDetailPage.cs b/Xamarin.Forms.Core/MasterDetailPage.cs new file mode 100644 index 00000000..a0849aa4 --- /dev/null +++ b/Xamarin.Forms.Core/MasterDetailPage.cs @@ -0,0 +1,229 @@ +using System; +using Xamarin.Forms.Platform; + +namespace Xamarin.Forms +{ + [RenderWith(typeof(_MasterDetailPageRenderer))] + public class MasterDetailPage : Page + { + public static readonly BindableProperty IsGestureEnabledProperty = BindableProperty.Create("IsGestureEnabled", typeof(bool), typeof(MasterDetailPage), true); + + public static readonly BindableProperty IsPresentedProperty = BindableProperty.Create("IsPresented", typeof(bool), typeof(MasterDetailPage), default(bool), + propertyChanged: OnIsPresentedPropertyChanged, propertyChanging: OnIsPresentedPropertyChanging); + + public static readonly BindableProperty MasterBehaviorProperty = BindableProperty.Create("MasterBehavior", typeof(MasterBehavior), typeof(MasterDetailPage), default(MasterBehavior), + propertyChanged: OnMasterBehaviorPropertyChanged); + + Page _detail; + + Rectangle _detailBounds; + + Page _master; + + Rectangle _masterBounds; + + public Page Detail + { + get { return _detail; } + set + { + if (_detail != null && value == null) + throw new ArgumentNullException("value", "Detail cannot be set to null once a value is set."); + + if (_detail == value) + return; + + if (value.RealParent != null) + throw new InvalidOperationException("Detail must not already have a parent."); + + OnPropertyChanging(); + if (_detail != null) + InternalChildren.Remove(_detail); + _detail = value; + InternalChildren.Add(_detail); + OnPropertyChanged(); + } + } + + public bool IsGestureEnabled + { + get { return (bool)GetValue(IsGestureEnabledProperty); } + set { SetValue(IsGestureEnabledProperty, value); } + } + + public bool IsPresented + { + get { return (bool)GetValue(IsPresentedProperty); } + set { SetValue(IsPresentedProperty, value); } + } + + public Page Master + { + get { return _master; } + set + { + if (_master != null && value == null) + throw new ArgumentNullException("value", "Master cannot be set to null once a value is set"); + + if (string.IsNullOrEmpty(value.Title)) + throw new InvalidOperationException("Title property must be set on Master page"); + + if (_master == value) + return; + + if (value.RealParent != null) + throw new InvalidOperationException("Master must not already have a parent."); + + OnPropertyChanging(); + if (_master != null) + InternalChildren.Remove(_master); + _master = value; + InternalChildren.Add(_master); + OnPropertyChanged(); + } + } + + public MasterBehavior MasterBehavior + { + get { return (MasterBehavior)GetValue(MasterBehaviorProperty); } + set { SetValue(MasterBehaviorProperty, value); } + } + + internal bool CanChangeIsPresented { get; set; } = true; + + internal Rectangle DetailBounds + { + get { return _detailBounds; } + set + { + _detailBounds = value; + if (_detail == null) + throw new InvalidOperationException("Detail must be set before using a MasterDetailPage"); + _detail.Layout(value); + } + } + + internal Rectangle MasterBounds + { + get { return _masterBounds; } + set + { + _masterBounds = value; + if (_master == null) + throw new InvalidOperationException("Master must be set before using a MasterDetailPage"); + _master.Layout(value); + } + } + + internal bool ShouldShowSplitMode + { + get + { + if (Device.Idiom == TargetIdiom.Phone) + return false; + + MasterBehavior behavior = MasterBehavior; + DeviceOrientation orientation = Device.Info.CurrentOrientation; + + bool isSplitOnLandscape = (behavior == MasterBehavior.SplitOnLandscape || behavior == MasterBehavior.Default) && orientation.IsLandscape(); + bool isSplitOnPortrait = behavior == MasterBehavior.SplitOnPortrait && orientation.IsPortrait(); + return behavior == MasterBehavior.Split || isSplitOnLandscape || isSplitOnPortrait; + } + } + + public event EventHandler IsPresentedChanged; + + public virtual bool ShouldShowToolbarButton() + { + if (Device.Idiom == TargetIdiom.Phone) + return true; + + MasterBehavior behavior = MasterBehavior; + DeviceOrientation orientation = Device.Info.CurrentOrientation; + + bool isSplitOnLandscape = (behavior == MasterBehavior.SplitOnLandscape || behavior == MasterBehavior.Default) && orientation.IsLandscape(); + bool isSplitOnPortrait = behavior == MasterBehavior.SplitOnPortrait && orientation.IsPortrait(); + return behavior != MasterBehavior.Split && !isSplitOnLandscape && !isSplitOnPortrait; + } + + protected override void LayoutChildren(double x, double y, double width, double height) + { + if (Master == null || Detail == null) + throw new InvalidOperationException("Master and Detail must be set before using a MasterDetailPage"); + _master.Layout(_masterBounds); + _detail.Layout(_detailBounds); + } + + protected override void OnAppearing() + { + CanChangeIsPresented = true; + UpdateMasterBehavior(this); + base.OnAppearing(); + } + + protected override bool OnBackButtonPressed() + { + if (IsPresented) + { + if (Master.SendBackButtonPressed()) + return true; + } + + EventHandler<BackButtonPressedEventArgs> handler = BackButtonPressed; + if (handler != null) + { + var args = new BackButtonPressedEventArgs(); + handler(this, args); + if (args.Handled) + return true; + } + + if (Detail.SendBackButtonPressed()) + { + return true; + } + + return base.OnBackButtonPressed(); + } + + protected override void OnParentSet() + { + if (RealParent != null && (Master == null || Detail == null)) + throw new InvalidOperationException("Master and Detail must be set before adding MasterDetailPage to a container"); + base.OnParentSet(); + } + + internal event EventHandler<BackButtonPressedEventArgs> BackButtonPressed; + + internal static void UpdateMasterBehavior(MasterDetailPage page) + { + if (page.ShouldShowSplitMode) + { + page.SetValueCore(IsPresentedProperty, true); + if (page.MasterBehavior != MasterBehavior.Default) + page.CanChangeIsPresented = false; + } + } + + static void OnIsPresentedPropertyChanged(BindableObject sender, object oldValue, object newValue) + { + var page = (MasterDetailPage)sender; + EventHandler handler = page.IsPresentedChanged; + if (handler != null) + handler(page, EventArgs.Empty); + } + + static void OnIsPresentedPropertyChanging(BindableObject sender, object oldValue, object newValue) + { + var page = (MasterDetailPage)sender; + if (!page.CanChangeIsPresented) + throw new InvalidOperationException(string.Format("Can't change IsPresented when setting {0}", page.MasterBehavior)); + } + + static void OnMasterBehaviorPropertyChanged(BindableObject sender, object oldValue, object newValue) + { + var page = (MasterDetailPage)sender; + UpdateMasterBehavior(page); + } + } +}
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