diff options
Diffstat (limited to 'Xwt.WPF/Xwt.WPFBackend/ScrollControlBackend.cs')
-rw-r--r-- | Xwt.WPF/Xwt.WPFBackend/ScrollControlBackend.cs | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/Xwt.WPF/Xwt.WPFBackend/ScrollControlBackend.cs b/Xwt.WPF/Xwt.WPFBackend/ScrollControlBackend.cs new file mode 100644 index 00000000..3c0808ba --- /dev/null +++ b/Xwt.WPF/Xwt.WPFBackend/ScrollControlBackend.cs @@ -0,0 +1,106 @@ +// +// ScrollControlBackend.cs +// +// Author: +// lluis <> +// +// Copyright (c) 2014 lluis +// +// 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 Xwt.Backends; +using System.Windows.Controls; + +namespace Xwt.WPFBackend +{ + public class ScrollControlBackend: Backend, IScrollControlBackend + { + double scrollValue; + bool isVertical; + ScrollViewer targetScrollViewer; + + public ScrollControlBackend() + { + } + + public ScrollControlBackend (ScrollViewer s, bool isVertical) + { + targetScrollViewer = s; + this.isVertical = isVertical; + scrollValue = Value; + targetScrollViewer.ScrollChanged += HandleScrollChanged; + } + + void HandleScrollChanged (object sender, ScrollChangedEventArgs e) + { + if (Value != scrollValue) { + scrollValue = Value; + Context.InvokeUserCode (EventSink.OnValueChanged); + } + } + + public void Initialize(IScrollControlEventSink eventSink) + { + EventSink = eventSink; + } + + public double Value + { + get { return isVertical ? targetScrollViewer.VerticalOffset : targetScrollViewer.HorizontalOffset; } + set { + if (isVertical) + targetScrollViewer.ScrollToVerticalOffset(value); + else + targetScrollViewer.ScrollToVerticalOffset(value); + } + } + + public double LowerValue + { + get { return 0; } + } + + public double UpperValue + { + get { return isVertical ? targetScrollViewer.ScrollableHeight : targetScrollViewer.ScrollableWidth; } + } + + public double PageIncrement + { + get { return PageSize; } + } + + public double StepIncrement + { + get { return 1; } + } + + public double PageSize + { + get { return isVertical ? targetScrollViewer.ViewportWidth : targetScrollViewer.ViewportHeight; } + } + + internal IScrollControlEventSink EventSink + { + get; + private set; + } + } +} + |