using System;
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using Android.Widget;
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using Android.Views;
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using Android.Content;
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using Android.Util;
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using Android.Runtime;
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namespace Shared
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{
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//已经全面检查了代码
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/// <summary>
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/// 位置布局
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/// </summary>
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public class HorizontalScrolViewLayout:ViewGroup
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{
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/// <summary>
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/// 构造函数
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/// </summary>
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public HorizontalScrolViewLayout()
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{
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viewGroup = new AndroidHorizontalScrollView(Application.Activity,this);
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realViewGroup = new AndroidLinearLayout(Application.Activity,this);
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(realViewGroup as AndroidLinearLayout).Orientation = Orientation.Horizontal;
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viewGroup.AddView(realViewGroup);
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HorizontalScrollBarEnabled = false;
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}
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/// <summary>
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/// 视图宽度
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/// </summary>
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/// <value>The width.</value>
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public override int Width
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{
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get
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{
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return base.Width;
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}
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set
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{
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base.Width = value;
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if (!IsCanRefresh)
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{
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return;
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}
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realViewGroup.LayoutParameters.Width = Width;
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}
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}
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/// <summary>
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/// 视图高度
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/// </summary>
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/// <value>The height.</value>
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public override int Height
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{
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get
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{
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return base.Height;
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}
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set
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{
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base.Height = value;
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if (!IsCanRefresh)
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{
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return;
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}
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realViewGroup.LayoutParameters.Height = Height;
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}
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}
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/// <summary>
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/// 是否允许滑动
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/// </summary>
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/// <value><c>true</c> if scroll enabled; otherwise, <c>false</c>.</value>
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public bool ScrollEnabled
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{
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get
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{
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return (viewGroup as AndroidHorizontalScrollView).ScrollEnabled;
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}
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set
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{
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(viewGroup as AndroidHorizontalScrollView).ScrollEnabled = value;
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}
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}
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/// <summary>
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/// 是否正在滑动
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/// </summary>
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/// <value><c>true</c> if decelerating; otherwise, <c>false</c>.</value>
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public bool Decelerating
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{
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get
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{
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return false;
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}
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}
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/// <summary>
/// 是否显示滚动条
/// </summary>
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//bool _IsShowScrollBar;
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public bool HorizontalScrollBarEnabled
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{
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get
{
return (viewGroup as AndroidHorizontalScrollView).HorizontalScrollBarEnabled;
}
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set
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{
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(viewGroup as AndroidHorizontalScrollView).HorizontalScrollBarEnabled = value;
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}
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}
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/// <summary>
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/// 滑动到指定View
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/// </summary>
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/// <param name="viewIndex"> 指定view的索引值</param>
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public void ScrollToViewIndex(int viewIndex)
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{
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if (viewList.Count == 0)
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return;
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var viewX = this.viewList[viewIndex].X;
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if (viewX < 0)
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{
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viewX = 0;
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}
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(viewGroup as AndroidHorizontalScrollView).ScrollTo(viewX, 0);
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}
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/// <summary>
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/// 滑动到指定位置 X
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/// </summary>
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/// <param name="viewX"></param>
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public void ScrollToX(int viewX)
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{
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if (viewX < 0)
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{
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viewX = 0;
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}
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(viewGroup as AndroidHorizontalScrollView).ScrollTo(viewX, 0);
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}
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}
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/// <summary>
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/// Android 原生 AndroidHorizontalScrollView
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/// </summary>
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class AndroidHorizontalScrollView: Android.Widget.HorizontalScrollView
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{
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public bool ScrollEnabled=true;
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View _view;
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/// <summary>
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/// 构造函数
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/// </summary>
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/// <param name="context">Context.</param>
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/// <param name="view">View.</param>
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public AndroidHorizontalScrollView(Context context,View view)
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: base(context) {
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_view = view;
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}
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/// <summary>
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/// 重写点击事件
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/// </summary>
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/// <returns><c>true</c>事件已经处理<c>false</c>事件没有处理</returns>
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/// <param name="e">E.</param>
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public override bool OnTouchEvent(MotionEvent e)
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{
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if (ScrollEnabled)
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{
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base.OnTouchEvent(e);
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}
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_view.TouchEvent( e);
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return true;
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}
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public override bool DispatchTouchEvent(MotionEvent e)
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{
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//Shared.HDLUtils.WriteLine($"{GetType()} Height->{Height} Width->{Width} DispatchTouchEvent->{e.Action}");
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if (e.Action == MotionEventActions.Down)
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{
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//还原允许拦截事件
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RequestDisallowInterceptTouchEvent(false);
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}
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return base.DispatchTouchEvent(e);
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}
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float mLastX, mLastY;
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public override bool OnInterceptTouchEvent(MotionEvent ev)
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{
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//Shared.HDLUtils.WriteLine($"{GetType()} Height->{Height} Width->{Width} OnInterceptTouchEvent->{ev.Action}");
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if (!Enabled || disallowIntercept)
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{
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return false;
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}
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switch (ev.Action)
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{
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case MotionEventActions.Down:
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mLastX = ev.RawX;
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mLastY = ev.RawY;
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Parent?.RequestDisallowInterceptTouchEvent(true);
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break;
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case MotionEventActions.Move:
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var x = ev.RawX;
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var y = ev.RawY;
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var deltaX = x - mLastX;
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var deltaY = y - mLastY;
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//左右滑动
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if (Math.Abs(deltaY) < Math.Abs(deltaX))
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{
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//向下滑动，如果当前已经滑动到顶，就允许父控件的拦截事件
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if (deltaX > 0 && ScrollX == 0)
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{
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Parent?.RequestDisallowInterceptTouchEvent(false);
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return false;
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}
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//向上滑动时，如果translateY等于高度时，即表明滑动到底部，可又顶层View控制滑动
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var rightLoaction = 0;
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if (0 < ChildCount)
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{
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rightLoaction = GetChildAt(ChildCount - 1).Right;
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}
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var translateX = rightLoaction - ScrollX;
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if (deltaX < 0 && translateX == Width)
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{
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Parent?.RequestDisallowInterceptTouchEvent(false);
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return false;
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}
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}
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else
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{
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//上下滑动时，允许父控件的拦截
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if (4 < Math.Abs(deltaY))
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{
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Parent?.RequestDisallowInterceptTouchEvent(false);
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}
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}
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break;
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}
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return base.OnInterceptTouchEvent(ev);
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}
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bool disallowIntercept;
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public override void RequestDisallowInterceptTouchEvent(bool disallowIntercept)
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{
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this.disallowIntercept = disallowIntercept;
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//Shared.HDLUtils.WriteLine($"{GetType()} Height->{Height} RequestDisallowInterceptTouchEvent->{disallowIntercept}");
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base.RequestDisallowInterceptTouchEvent(disallowIntercept);
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Parent?.RequestDisallowInterceptTouchEvent(disallowIntercept);
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}
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}
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}
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