diff options
Diffstat (limited to 'Xamarin.Forms.Platform.MacOS/Renderers/TabbedPageRenderer.cs')
| -rw-r--r-- | Xamarin.Forms.Platform.MacOS/Renderers/TabbedPageRenderer.cs | 403 |
1 files changed, 403 insertions, 0 deletions
diff --git a/Xamarin.Forms.Platform.MacOS/Renderers/TabbedPageRenderer.cs b/Xamarin.Forms.Platform.MacOS/Renderers/TabbedPageRenderer.cs new file mode 100644 index 00000000..3aee095d --- /dev/null +++ b/Xamarin.Forms.Platform.MacOS/Renderers/TabbedPageRenderer.cs @@ -0,0 +1,403 @@ +using System; +using System.Collections.Specialized; +using System.ComponentModel; +using AppKit; +using CoreGraphics; +using Xamarin.Forms.Internals; +using Xamarin.Forms.PlatformConfiguration.macOSSpecific; + +namespace Xamarin.Forms.Platform.MacOS +{ + public class TabbedPageRenderer : NSTabViewController, IVisualElementRenderer, IEffectControlProvider + { + const float DefaultImageSizeSegmentedButton = 19; + const int TabHolderHeight = 30; + + bool _disposed; + bool _updatingControllers; + bool _barBackgroundColorWasSet; + bool _barTextColorWasSet; + bool _defaultBarTextColorSet; + bool _defaultBarColorSet; + VisualElementTracker _tracker; + bool _loaded; + Size _queuedSize; + + + public VisualElement Element { get; private set; } + + public event EventHandler<VisualElementChangedEventArgs> ElementChanged; + + public SizeRequest GetDesiredSize(double widthConstraint, double heightConstraint) + { + return NativeView.GetSizeRequest(widthConstraint, heightConstraint); + } + + public NSView NativeView => View; + + public void SetElement(VisualElement element) + { + var oldElement = Element; + Element = element; + + if (oldElement != null) + { + oldElement.PropertyChanged -= OnPropertyChanged; + var tabbedPage = oldElement as TabbedPage; + if (tabbedPage != null) tabbedPage.PagesChanged -= OnPagesChanged; + } + + if (element != null) + { + if (_tracker == null) + { + _tracker = new VisualElementTracker(this); + _tracker.NativeControlUpdated += (sender, e) => UpdateNativeWidget(); + } + } + + OnElementChanged(new VisualElementChangedEventArgs(oldElement, element)); + + ConfigureTabView(); + + OnPagesChanged(null, new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset)); + + Tabbed.PropertyChanged += OnPropertyChanged; + Tabbed.PagesChanged += OnPagesChanged; + + UpdateBarBackgroundColor(); + + UpdateBarTextColor(); + + EffectUtilities.RegisterEffectControlProvider(this, oldElement, element); + } + + IPageController PageController => Element as IPageController; + + IElementController ElementController => Element; + + void IEffectControlProvider.RegisterEffect(Effect effect) + { + var platformEffect = effect as PlatformEffect; + if (platformEffect != null) + platformEffect.Container = View; + } + + public void SetElementSize(Size size) + { + if (_loaded) + Element.Layout(new Rectangle(Element.X, Element.Y, size.Width, size.Height)); + else + _queuedSize = size; + } + + public NSViewController ViewController => this; + + public override void ViewWillLayout() + { + base.ViewWillLayout(); + + if (Element == null) + return; + + if (!Element.Bounds.IsEmpty) + View.Frame = new System.Drawing.RectangleF((float)Element.X, (float)Element.Y, (float)Element.Width, (float)Element.Height); + + var frame = View.Frame; + PageController.ContainerArea = new Rectangle(0, 0, frame.Width, frame.Height - TabHolderHeight); + + if (!_queuedSize.IsZero) + { + Element.Layout(new Rectangle(Element.X, Element.Y, _queuedSize.Width, _queuedSize.Height)); + _queuedSize = Size.Zero; + } + + _loaded = true; + } + + + public override nint SelectedTabViewItemIndex + { + get { return base.SelectedTabViewItemIndex; } + set + { + base.SelectedTabViewItemIndex = value; + if (!_updatingControllers) + UpdateCurrentPage(); + } + } + + public override void ViewDidAppear() + { + PageController.SendAppearing(); + base.ViewDidAppear(); + } + + public override void ViewDidDisappear() + { + base.ViewDidDisappear(); + PageController.SendDisappearing(); + } + + protected override void Dispose(bool disposing) + { + if (disposing && !_disposed) + { + _disposed = true; + PageController.SendDisappearing(); + Tabbed.PropertyChanged -= OnPropertyChanged; + Tabbed.PagesChanged -= OnPagesChanged; + + if (_tracker != null) + { + _tracker.Dispose(); + _tracker = null; + } + } + + base.Dispose(disposing); + } + + protected virtual void ConfigureTabView() + { + View.WantsLayer = true; + TabView.WantsLayer = true; + TabView.DrawsBackground = false; + var tabStyle = Tabbed.OnThisPlatform().GetTabsStyle(); + switch (tabStyle) + { + case TabsStyle.OnNavigation: + case TabsStyle.Hidden: + TabStyle = NSTabViewControllerTabStyle.Unspecified; + break; + case TabsStyle.Icons: + TabStyle = NSTabViewControllerTabStyle.Toolbar; + break; + case TabsStyle.OnBottom: + TabStyle = NSTabViewControllerTabStyle.SegmentedControlOnBottom; + break; + default: + TabStyle = NSTabViewControllerTabStyle.SegmentedControlOnTop; + break; + } + + TabView.TabViewType = NSTabViewType.NSNoTabsNoBorder; + } + + protected virtual void OnElementChanged(VisualElementChangedEventArgs e) + { + ElementChanged?.Invoke(this, e); + } + + protected virtual NSTabViewItem GetTabViewItem(Page page, IVisualElementRenderer pageRenderer) + { + var tvi = new NSTabViewItem { ViewController = pageRenderer.ViewController, Label = page.Title ?? "" }; + if (!string.IsNullOrEmpty (page.Icon)) { + var image = GetTabViewItemIcon (page.Icon); + if (image != null) + tvi.Image = image; + } + return tvi; + } + + protected virtual NSImage GetTabViewItemIcon(string imageName) + { + var image = NSImage.ImageNamed (imageName); + if(image == null) + image = new NSImage (imageName); + + if (image == null) + return null; + + bool shouldResize = TabStyle == NSTabViewControllerTabStyle.SegmentedControlOnTop || + TabStyle == NSTabViewControllerTabStyle.SegmentedControlOnBottom; + if (shouldResize) + image = image.ResizeTo(new CGSize(DefaultImageSizeSegmentedButton, DefaultImageSizeSegmentedButton)); + return image; + } + + protected virtual void UpdateNativeWidget() + { + TabView.Layout(); + } + + protected TabbedPage Tabbed => (TabbedPage)Element; + + void OnPagePropertyChanged(object sender, PropertyChangedEventArgs e) + { + if (e.PropertyName == Page.TitleProperty.PropertyName) + { + var page = (Page)sender; + var index = TabbedPage.GetIndex(page); + TabViewItems[index].Label = page.Title; + } + else if (e.PropertyName == Page.IconProperty.PropertyName) + { + var page = (Page)sender; + + var index = TabbedPage.GetIndex(page); + TabViewItems[index].Label = page.Title; + + if (!string.IsNullOrEmpty(page.Icon)) + { + TabViewItems[index].Image = new NSImage(page.Icon); + } + else if (TabViewItems[index].Image != null) + { + TabViewItems[index].Image = new NSImage(); + } + } + } + + void OnPagesChanged(object sender, NotifyCollectionChangedEventArgs e) + { + e.Apply((o, i, c) => SetupPage((Page)o, i), (o, i) => TeardownPage((Page)o), Reset); + + SetControllers(); + + UpdateChildrenOrderIndex(); + + SetSelectedTabViewItem(); + } + + void OnPropertyChanged(object sender, PropertyChangedEventArgs e) + { + if (e.PropertyName == nameof(TabbedPage.CurrentPage)) + { + var current = Tabbed.CurrentPage; + if (current == null) + return; + + SetSelectedTabViewItem(); + } + else if (e.PropertyName == TabbedPage.BarBackgroundColorProperty.PropertyName) + UpdateBarBackgroundColor(); + else if (e.PropertyName == TabbedPage.BarTextColorProperty.PropertyName) + UpdateBarTextColor(); + } + + void Reset() + { + var i = 0; + foreach (var page in Tabbed.Children) + SetupPage(page, i++); + } + + void SetControllers() + { + _updatingControllers = true; + for (var i = 0; i < ElementController.LogicalChildren.Count; i++) + { + var child = ElementController.LogicalChildren[i]; + var page = child as Page; + if (page == null) + continue; + + var pageRenderer = Platform.GetRenderer(page); + if (pageRenderer != null) + { + pageRenderer.ViewController.Identifier = i.ToString(); + + NSTabViewItem newTvi = GetTabViewItem(page, pageRenderer); + + AddTabViewItem(newTvi); + } + } + _updatingControllers = false; + } + + void SetupPage(Page page, int index) + { + var renderer = Platform.GetRenderer(page); + if (renderer == null) + { + renderer = Platform.CreateRenderer(page); + Platform.SetRenderer(page, renderer); + } + + renderer.ViewController.Identifier = index.ToString(); + + page.PropertyChanged += OnPagePropertyChanged; + } + + void TeardownPage(Page page) + { + page.PropertyChanged -= OnPagePropertyChanged; + + Platform.SetRenderer(page, null); + } + + void SetSelectedTabViewItem() + { + if (Tabbed.CurrentPage == null) + return; + var selectedIndex = TabbedPage.GetIndex(Tabbed.CurrentPage); + SelectedTabViewItemIndex = selectedIndex; + } + + void UpdateChildrenOrderIndex() + { + for (var i = 0; i < TabViewItems.Length; i++) + { + int originalIndex; + if (int.TryParse(TabViewItems[i].ViewController.Identifier, out originalIndex)) + { + var page = PageController.InternalChildren[originalIndex]; + TabbedPage.SetIndex(page as Page, i); + } + } + } + + void UpdateCurrentPage() + { + var count = PageController.InternalChildren.Count; + Tabbed.CurrentPage = SelectedTabViewItemIndex >= 0 && SelectedTabViewItemIndex < count + ? Tabbed.GetPageByIndex((int)SelectedTabViewItemIndex) + : null; + } + + //TODO: Implement UpdateBarBackgroundColor + void UpdateBarBackgroundColor() + { + if (Tabbed == null || TabView == null) + return; + + var barBackgroundColor = Tabbed.BarBackgroundColor; + var isDefaultColor = barBackgroundColor.IsDefault; + + if (isDefaultColor && !_barBackgroundColorWasSet) + return; + + if (!_defaultBarColorSet) + { + //_defaultBarColor = TabView.color; + _defaultBarColorSet = true; + } + + if (!isDefaultColor) + _barBackgroundColorWasSet = true; + } + + //TODO: Implement UpdateBarTextColor + void UpdateBarTextColor() + { + if (Tabbed == null || TabView == null) + return; + + var barTextColor = Tabbed.BarTextColor; + var isDefaultColor = barTextColor.IsDefault; + + if (isDefaultColor && !_barTextColorWasSet) + return; + + if (!_defaultBarTextColorSet) + { + // _defaultBarTextColor = TabBar.TintColor; + _defaultBarTextColorSet = true; + } + + if (!isDefaultColor) + _barTextColorWasSet = true; + } + } +}
\ No newline at end of file |