Ejemplo n.º 1
0
        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);
        }
Ejemplo n.º 2
0
        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;
        }