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//
// ScrollControlBackend.cs
//
// Author:
// Lluis Sanchez <lluis@xamarin.com>
//
// Copyright (c) 2012 Xamarin Inc
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
using System;
using AppKit;
using CoreGraphics;
using Xwt.Backends;
namespace Xwt.Mac
{
class ScrollControlBackend: IScrollControlBackend
{
bool vertical;
NSScrollView scrollView;
IScrollControlEventSink eventSink;
ApplicationContext appContext;
double lastValue;
public ScrollControlBackend (ApplicationContext appContext, NSScrollView scrollView, bool vertical)
{
this.vertical = vertical;
this.scrollView = scrollView;
this.appContext = appContext;
lastValue = Value;
}
public void NotifyValueChanged ()
{
if (lastValue != Value) {
lastValue = Value;
appContext.InvokeUserCode (delegate {
eventSink.OnValueChanged ();
});
}
}
#region IBackend implementation
public void InitializeBackend (object frontend, ApplicationContext context)
{
}
public void EnableEvent (object eventId)
{
}
public void DisableEvent (object eventId)
{
}
#endregion
#region IScrollAdjustmentBackend implementation
public void Initialize (IScrollControlEventSink eventSink)
{
this.eventSink = eventSink;
}
public double Value {
get {
if (vertical)
return scrollView.DocumentVisibleRect.Y;
else
return scrollView.DocumentVisibleRect.X;
}
set {
if (vertical)
scrollView.ContentView.ScrollToPoint (new CGPoint (scrollView.DocumentVisibleRect.X, (nfloat)value));
else
scrollView.ContentView.ScrollToPoint (new CGPoint ((nfloat)value, scrollView.DocumentVisibleRect.Y));
scrollView.ReflectScrolledClipView (scrollView.ContentView);
}
}
public double LowerValue {
get {
return 0;
}
}
public double UpperValue {
get { return vertical ? scrollView.ContentSize.Height : scrollView.ContentSize.Width; }
}
public double PageIncrement {
get {
return vertical ? scrollView.VerticalPageScroll : scrollView.HorizontalPageScroll;
}
}
public double PageSize {
get {
return vertical ? scrollView.DocumentVisibleRect.Height : scrollView.DocumentVisibleRect.Width;
}
}
public double StepIncrement {
get {
return vertical ? scrollView.VerticalLineScroll : scrollView.HorizontalLineScroll;
}
}
#endregion
}
}
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