protected override void OnPropertyChanged(string propertyName = null)
{
if (!isSettingContent && propertyName == "Content")
{
throw new InvalidOperationException("Cannot set Content of TabLayout");
}
if (propertyName == "SelectedIndex")
{
if (oldSelectedIndex > -1 && this.Children.Count > oldSelectedIndex)
{
var oldTab = this.Children.ElementAt(oldSelectedIndex);
oldTab.SetSelected(false);
}
if (SelectedIndex > -1 && this.Children.Count > SelectedIndex)
{
var newTab = this.Children.ElementAt(SelectedIndex);
newTab.SetSelected(true);
this.TabContentView.RaiseChild(newTab);
}
SetTabChildrenBackground();
}
else if (propertyName == "ScrollEnabled")
{
var stackLayout = (StackLayout)this.Content;
stackLayout.Children.RemoveAt(0);
View view;
if (ScrollEnabled)
{
view = new HorizontalScrollView
{
Padding = 0,
Orientation = ScrollOrientation.Horizontal,
Content = this.GridView
};
CurrentScrollView = view as HorizontalScrollView;
CurrentScrollView.Padding = new Thickness(130, 0, 130, 0);
}
else
{
view = this.GridView;
CurrentScrollView = null;
}
stackLayout.Children.Insert(0, view);
}
switch (propertyName)
{
case "BackgroundColor":
case "SelectedBackgroundColor":
case "SelectedBackgroundImage": SetTabChildrenBackground(); break;
case "BackgroundImage": SetTabChildrenBackground(); break;
case "TabHeight": tabHeight.Height = new GridLength(this.TabHeight); break;
}
base.OnPropertyChanged(propertyName);
}
public TabLayout()
{
this.GridView = new Grid
{
HorizontalOptions = LayoutOptions.FillAndExpand,
RowSpacing = 0,
};
this.GridView.SetBinding(Grid.ColumnSpacingProperty, new Binding(path: "TabSpacing", source: this));
this.VerticalOptions = LayoutOptions.FillAndExpand;
this.HorizontalOptions = LayoutOptions.FillAndExpand;
this.Padding = 0;
TabContentView = new Grid
{
VerticalOptions = LayoutOptions.FillAndExpand,
HorizontalOptions = LayoutOptions.FillAndExpand,
RowSpacing = 0
};
TabContentView.RowDefinitions.Add(new RowDefinition {
Height = new GridLength(1, GridUnitType.Auto)
});
TabContentView.RowDefinitions.Add(new RowDefinition {
Height = new GridLength(1, GridUnitType.Star)
});
View view = null;
if (ScrollEnabled)
{
view = new HorizontalScrollView
{
Padding = 0,
Orientation = ScrollOrientation.Horizontal,
Content = this.GridView
};
CurrentScrollView = view as HorizontalScrollView;
}
else
{
view = this.GridView;
}
var box = new BoxView();
box.SetBinding(BoxView.HeightRequestProperty, new Binding()
{
Source = this, Path = "SeparatorHeight"
});
box.SetBinding(BoxView.ColorProperty, new Binding()
{
Source = this, Path = "LineColor"
});
var box1 = new BoxView();
box1.SetBinding(BoxView.HeightRequestProperty, new Binding()
{
Source = this, Path = "SeparatorHeight"
});
box1.SetBinding(BoxView.ColorProperty, new Binding()
{
Source = this, Path = "LineColor"
});
//this.GridView.Children.Add(box, idx, 1);
isSettingContent = true;
var contentLayout = new StackLayout
{
HorizontalOptions = LayoutOptions.FillAndExpand,
VerticalOptions = LayoutOptions.FillAndExpand,
Orientation = StackOrientation.Vertical,
Padding = 0,
Spacing = 0,
Children =
{
box,
view,
box1
},
};
TabContentView.Children.Add(contentLayout, 0, 0);
this.Content = TabContentView;
isSettingContent = false;
tabHeight = new RowDefinition();
tabHeight.Height = new GridLength(this.TabHeight);
//tabHeight.SetBinding(RowDefinition.HeightProperty, new Binding { Source = this, Path = "HeightRequest" });
//this.GridView.ColumnDefinitions.Add(new ColumnDefinition() { Width = new GridLength(1, GridUnitType.Auto) });
this.GridView.RowDefinitions.Add(tabHeight);
var lineRow = new RowDefinition();
lineRow.SetBinding(RowDefinition.HeightProperty, new Binding {
Source = this, Path = "LineHeight"
});
//this.GridView.RowDefinitions.Add(lineRow);
//this.GridView.ColumnSpacing = 0;
//this.GridView.RowSpacing = 0;
_tabChildren.CollectionChanged += _tabChildren_CollectionChanged;
// TODO: implement XChanged as an event from listview
//Resolver.Get<IScrollListener>().XChanged += TabLayout_XChanged;
}