107 строки
2.7 KiB
C#
107 строки
2.7 KiB
C#
//
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// ScrollControlBackend.cs
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//
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// Author:
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// lluis <>
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//
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// Copyright (c) 2014 lluis
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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using System;
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using Xwt.Backends;
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using System.Windows.Controls;
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namespace Xwt.WPFBackend
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{
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public class ScrollControlBackend: Backend, IScrollControlBackend
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{
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double scrollValue;
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bool isVertical;
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ScrollViewer targetScrollViewer;
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public ScrollControlBackend()
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{
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}
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public ScrollControlBackend (ScrollViewer s, bool isVertical)
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{
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targetScrollViewer = s;
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this.isVertical = isVertical;
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scrollValue = Value;
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targetScrollViewer.ScrollChanged += HandleScrollChanged;
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}
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void HandleScrollChanged (object sender, ScrollChangedEventArgs e)
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{
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if (Value != scrollValue) {
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scrollValue = Value;
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Context.InvokeUserCode (EventSink.OnValueChanged);
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}
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}
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public void Initialize(IScrollControlEventSink eventSink)
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{
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EventSink = eventSink;
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}
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public double Value
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{
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get { return isVertical ? targetScrollViewer.VerticalOffset : targetScrollViewer.HorizontalOffset; }
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set {
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if (isVertical)
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targetScrollViewer.ScrollToVerticalOffset(value);
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else
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targetScrollViewer.ScrollToHorizontalOffset(value);
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}
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}
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public double LowerValue
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{
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get { return 0; }
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}
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public double UpperValue
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{
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get { return isVertical ? targetScrollViewer.ScrollableHeight : targetScrollViewer.ScrollableWidth; }
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}
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public double PageIncrement
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{
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get { return PageSize; }
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}
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public double StepIncrement
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{
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get { return 1; }
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}
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public double PageSize
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{
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get { return isVertical ? targetScrollViewer.ViewportWidth : targetScrollViewer.ViewportHeight; }
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}
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internal IScrollControlEventSink EventSink
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{
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get;
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private set;
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}
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}
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}
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