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using System;
using AppKit;
using CoreGraphics;
using Foundation;
namespace Xamarin.PropertyEditing.Mac
{
internal class UnderlinedTabViewController<TViewModel>
: NotifyingTabViewController<TViewModel>
where TViewModel : NotifyingObject
{
public UnderlinedTabViewController (IHostResourceProvider hostResources)
{
if (hostResources == null)
throw new ArgumentNullException (nameof (hostResources));
HostResources = hostResources;
}
public string TabBackgroundColor
{
get => this.tabBackground;
set
{
if (this.tabContainer != null)
this.tabContainer.FillColorName = value;
this.tabBackground = value;
}
}
public string TabBorderColor
{
get => this.tabBorder;
set
{
if (this.border != null)
this.border.FillColorName = value;
this.tabBorder = value;
}
}
public override void InsertTabViewItem (NSTabViewItem tabViewItem, nint index)
{
this.tabStack.InsertView (GetView (tabViewItem), (nuint)index, NSStackViewGravity.Leading);
base.InsertTabViewItem (tabViewItem, index);
}
public override void RemoveTabViewItem (NSTabViewItem tabViewItem)
{
int index = (int)TabView.IndexOf (tabViewItem);
NSView tabView = this.tabStack.Views[index];
this.tabStack.RemoveView (tabView);
tabView.Dispose ();
base.RemoveTabViewItem (tabViewItem);
}
/// <remarks>This doesn't actually support independent left/right padding, they'll be added and content centered.</remarks>
public NSEdgeInsets ContentPadding {
get => this.edgeInsets;
set {
this.edgeInsets = value;
UpdatePadding ();
}
}
public override void MouseDown (NSEvent theEvent)
{
NSView hit = View.HitTest (View.Superview.ConvertPointFromView (theEvent.LocationInWindow, null));
if (!(hit is IUnderliningTabView))
return;
SelectedTabViewItemIndex = Array.IndexOf (this.tabStack.Views, hit);
}
public override void DidSelect (NSTabView tabView, NSTabViewItem item)
{
base.DidSelect (tabView, item);
int i = (int)TabView.IndexOf (item);
SetSelected (i);
}
public override nint SelectedTabViewItemIndex
{
get => base.SelectedTabViewItemIndex;
set
{
base.SelectedTabViewItemIndex = value;
SetSelected ((int)value);
}
}
public override void LoadView ()
{
this.innerStack = new NSStackView () {
Spacing = 0,
Alignment = NSLayoutAttribute.Left,
Orientation = NSUserInterfaceLayoutOrientation.Vertical,
};
NSView tabs = this.tabStack;
if (TabBackgroundColor != null) {
this.tabContainer = new DynamicBox (HostResources, TabBackgroundColor) {
ContentView = this.tabStack
};
tabs = this.tabContainer;
}
this.innerStack.AddView (tabs, NSStackViewGravity.Top);
if (TabBorderColor != null) {
this.border = new DynamicBox (HostResources, TabBorderColor) {
Frame = new CGRect (0, 0, 1, 1),
AutoresizingMask = NSViewResizingMask.WidthSizable
};
this.innerStack.AddView (this.border, NSStackViewGravity.Top);
}
this.innerStack.AddView (TabView, NSStackViewGravity.Bottom);
View = this.innerStack;
if (TabBackgroundColor != null) {
this.innerStack.AddConstraint (NSLayoutConstraint.Create (this.tabContainer, NSLayoutAttribute.Width, NSLayoutRelation.Equal, this.innerStack, NSLayoutAttribute.Width, 1, 0));
}
this.innerStack.AddConstraint (NSLayoutConstraint.Create (TabView, NSLayoutAttribute.CenterX, NSLayoutRelation.Equal, this.innerStack, NSLayoutAttribute.CenterX, 1, 0));
UpdatePadding ();
}
protected IHostResourceProvider HostResources
{
get;
}
private NSLayoutConstraint sidePadding, topPadding, bottomPadding;
private string tabBackground, tabBorder;
private IUnderliningTabView selected;
private DynamicBox tabContainer, border;
private NSStackView innerStack;
private readonly NSStackView tabStack = new NSStackView () {
Spacing = 1f,
};
protected NSStackView TabStack => this.tabStack;
private NSEdgeInsets edgeInsets = new NSEdgeInsets (0, 0, 0, 0);
private void UpdatePadding()
{
if (this.innerStack == null)
return;
if (this.sidePadding != null)
this.innerStack.RemoveConstraints (new[] { this.sidePadding, this.topPadding, this.bottomPadding });
this.sidePadding = NSLayoutConstraint.Create (TabView, NSLayoutAttribute.Width, NSLayoutRelation.Equal, this.innerStack, NSLayoutAttribute.Width, 1, -(ContentPadding.Left + ContentPadding.Right));
this.bottomPadding = NSLayoutConstraint.Create (TabView, NSLayoutAttribute.Bottom, NSLayoutRelation.Equal, this.innerStack, NSLayoutAttribute.Bottom, 1, -(ContentPadding.Bottom));
NSView bottomItem = this.border ?? this.tabContainer ?? (NSView)this.tabStack;
this.topPadding = NSLayoutConstraint.Create (TabView, NSLayoutAttribute.Top, NSLayoutRelation.Equal, bottomItem, NSLayoutAttribute.Bottom, 1, ContentPadding.Top);
this.innerStack.AddConstraints (new[] { this.sidePadding, this.topPadding, this.bottomPadding });
}
private void SetSelected (int index)
{
if (this.selected != null) {
this.selected.Selected = false;
}
this.selected = this.tabStack.Views[index] as IUnderliningTabView;
if (this.selected != null)
this.selected.Selected = true;
}
private NSView GetView (NSTabViewItem item)
{
var id = item.Identifier as NSObjectFacade;
NSView tabView;
if (id != null) {
tabView = new UnderlinedImageView (HostResources, ((string)id.Target)) {
Selected = this.tabStack.Views.Length == SelectedTabViewItemIndex,
ToolTip = item.ToolTip
};
} else {
tabView = new UnderlinedTextField {
BackgroundColor = NSColor.Clear,
Editable = false,
Bezeled = false,
StringValue = item.Label,
Selected = this.tabStack.Views.Length == SelectedTabViewItemIndex,
ToolTip = item.ToolTip
};
}
return tabView;
}
}
}
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