forked from dotnet/maui
/
ShellSectionView.cs
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/
ShellSectionView.cs
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using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.ComponentModel;
using ElmSharp;
using Tizen.UIExtensions.ElmSharp;
using EBox = ElmSharp.Box;
using EColor = ElmSharp.Color;
using EToolbarItem = ElmSharp.ToolbarItem;
using EToolbarItemEventArgs = ElmSharp.ToolbarItemEventArgs;
namespace Microsoft.Maui.Controls.Platform
{
public interface IShellSectionRenderer : IDisposable
{
EvasObject NativeView { get; }
}
public class ShellSectionView : IAppearanceObserver, IShellSectionRenderer
{
EBox _mainLayout = null;
EBox _contentArea = null;
Tabs _tabs = null;
EvasObject _currentContent = null;
Page _displayedPage;
Dictionary<ShellContent, EvasObject> _contentCache = new Dictionary<ShellContent, EvasObject>();
Dictionary<ShellContent, EToolbarItem> _contentToTabsItem = new Dictionary<ShellContent, EToolbarItem>();
Dictionary<EToolbarItem, ShellContent> _itemToContent = new Dictionary<EToolbarItem, ShellContent>();
List<EToolbarItem> _tabsItems = new List<EToolbarItem>();
EColor _backgroundColor = ShellView.DefaultBackgroundColor;
EColor _foregroundColor = ShellView.DefaultForegroundColor;
bool _disposed = false;
public ShellSectionView(ShellSection section, IMauiContext context)
{
ShellSection = section;
MauiContext = context;
ShellSection.PropertyChanged += OnSectionPropertyChanged;
(ShellSection.Items as INotifyCollectionChanged).CollectionChanged += OnShellSectionCollectionChanged;
_mainLayout = new EBox(NativeParent);
_mainLayout.SetLayoutCallback(OnLayout);
_contentArea = new EBox(NativeParent);
_contentArea.Show();
_mainLayout.PackEnd(_contentArea);
UpdateTabsItem();
UpdateCurrentItem(ShellSection.CurrentItem);
((IShellController)Shell.Current).AddAppearanceObserver(this, ShellSection);
(ShellSection as IShellSectionController).AddDisplayedPageObserver(this, UpdateDisplayedPage);
}
bool HasTabs => _tabs != null;
bool _tabBarIsVisible = true;
protected IMauiContext MauiContext { get; private set; }
protected EvasObject NativeParent
{
get => MauiContext?.Context?.BaseLayout;
}
protected virtual bool TabBarIsVisible
{
get => _tabBarIsVisible;
set
{
if (_tabBarIsVisible != value)
{
_tabBarIsVisible = value;
_mainLayout.MarkChanged();
if (value)
{
_tabs?.Show();
}
else
{
_tabs?.Hide();
}
}
}
}
public ShellSection ShellSection { get; }
public EvasObject NativeView
{
get
{
return _mainLayout;
}
}
public EColor ToolbarBackgroundColor
{
get
{
return _backgroundColor;
}
set
{
_backgroundColor = value;
UpdateToolbarBackgroudColor(_backgroundColor);
}
}
public EColor ToolbarForegroundColor
{
get
{
return _foregroundColor;
}
set
{
_foregroundColor = value;
UpdateToolbarForegroundColor(_foregroundColor);
}
}
~ShellSectionView()
{
Dispose(false);
}
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
void IAppearanceObserver.OnAppearanceChanged(ShellAppearance appearance)
{
var backgroundColor = (appearance as IShellAppearanceElement)?.EffectiveTabBarBackgroundColor;
var foregroundColor = appearance?.ForegroundColor;
ToolbarBackgroundColor = backgroundColor.IsDefault() ? ShellView.DefaultBackgroundColor : backgroundColor.ToNativeEFL();
ToolbarForegroundColor = foregroundColor.IsDefault() ? ShellView.DefaultForegroundColor : foregroundColor.ToNativeEFL();
}
void UpdateDisplayedPage(Page page)
{
if (_displayedPage != null)
{
_displayedPage.PropertyChanged -= OnDisplayedPagePropertyChanged;
}
if (page == null)
{
TabBarIsVisible = true;
return;
}
_displayedPage = page;
_displayedPage.PropertyChanged += OnDisplayedPagePropertyChanged;
TabBarIsVisible = Shell.GetTabBarIsVisible(page);
}
void OnDisplayedPagePropertyChanged(object sender, PropertyChangedEventArgs e)
{
if (e.PropertyName == Shell.TabBarIsVisibleProperty.PropertyName)
{
TabBarIsVisible = Shell.GetTabBarIsVisible(_displayedPage);
}
}
protected virtual void Dispose(bool disposing)
{
if (_disposed)
return;
if (disposing)
{
((IShellController)Shell.Current).RemoveAppearanceObserver(this);
if (ShellSection != null)
{
(ShellSection as IShellSectionController).RemoveDisplayedPageObserver(this);
ShellSection.PropertyChanged -= OnSectionPropertyChanged;
DeinitializeTabs();
foreach (var native in _contentCache.Values)
{
native.Unrealize();
}
_contentCache.Clear();
_contentToTabsItem.Clear();
_itemToContent.Clear();
}
NativeView.Unrealize();
}
_disposed = true;
}
void InitializeTabs()
{
if (_tabs != null)
{
return;
}
_tabs = new Tabs(NativeParent);
_tabs.Show();
_tabs.BackgroundColor = _backgroundColor;
_tabs.Scrollable = TabsType.Fixed;
_tabs.Selected += OnTabsSelected;
_mainLayout.PackEnd(_tabs);
}
void ClearTabsItem()
{
if (!HasTabs)
return;
foreach (var item in _tabsItems)
{
item.Delete();
}
_tabsItems.Clear();
_contentToTabsItem.Clear();
_itemToContent.Clear();
}
void DeinitializeTabs()
{
if (_tabs == null)
{
return;
}
ClearTabsItem();
_tabs.Unrealize();
_tabs = null;
}
void OnSectionPropertyChanged(object sender, PropertyChangedEventArgs e)
{
if (e.PropertyName == "CurrentItem")
{
UpdateCurrentItem(ShellSection.CurrentItem);
}
}
void UpdateCurrentItem(ShellContent content)
{
UpdateCurrentShellContent(content);
if (_contentToTabsItem.ContainsKey(content))
{
_contentToTabsItem[content].IsSelected = true;
}
}
void UpdateToolbarBackgroudColor(EColor color)
{
foreach (EToolbarItem item in _tabsItems)
{
item.SetBackgroundColor(color);
}
}
void UpdateToolbarForegroundColor(EColor color)
{
foreach (EToolbarItem item in _tabsItems)
{
item.SetUnderlineColor(color);
}
}
void UpdateTabsItem()
{
if (ShellSection.Items.Count <= 1)
{
DeinitializeTabs();
return;
}
InitializeTabs();
ClearTabsItem();
foreach (ShellContent content in ShellSection.Items)
{
InsertTabsItem(content);
}
_tabs.Scrollable = ShellSection.Items.Count > 3 ? TabsType.Scrollable : TabsType.Fixed;
}
EToolbarItem InsertTabsItem(ShellContent content)
{
EToolbarItem item = _tabs.Append(content.Title, null);
item.SetBackgroundColor(_backgroundColor);
item.SetUnderlineColor(_foregroundColor);
_tabsItems.Add(item);
_itemToContent[item] = content;
_contentToTabsItem[content] = item;
return item;
}
void OnShellSectionCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
UpdateTabsItem();
}
void OnTabsSelected(object sender, EToolbarItemEventArgs e)
{
if (_tabs.SelectedItem == null)
{
return;
}
ShellContent content = _itemToContent[_tabs.SelectedItem];
if (ShellSection.CurrentItem != content)
{
ShellSection.SetValueFromRenderer(ShellSection.CurrentItemProperty, content);
}
}
void UpdateCurrentShellContent(ShellContent content)
{
if (_currentContent != null)
{
_currentContent.Hide();
_contentArea.UnPack(_currentContent);
_currentContent = null;
}
if (content == null)
{
return;
}
if (!_contentCache.ContainsKey(content))
{
var native = CreateShellContent(content);
native.SetAlignment(-1, -1);
native.SetWeight(1, 1);
_contentCache[content] = native;
}
_currentContent = _contentCache[content];
_currentContent.Show();
_contentArea.PackEnd(_currentContent);
}
EvasObject CreateShellContent(ShellContent content)
{
Page xpage = ((IShellContentController)content).GetOrCreateContent();
return xpage.ToNative(MauiContext);
}
void OnLayout()
{
if (NativeView.Geometry.Width == 0 || NativeView.Geometry.Height == 0)
return;
var bound = NativeView.Geometry;
int tabsHeight;
if (HasTabs && TabBarIsVisible)
{
var tabsBound = bound;
tabsHeight = _tabs.MinimumHeight;
tabsBound.Height = tabsHeight;
_tabs.Geometry = tabsBound;
}
else
{
tabsHeight = 0;
}
var contentBound = bound;
contentBound.Y += tabsHeight;
contentBound.Height -= tabsHeight;
_contentArea.Geometry = contentBound;
}
}
}