如何构建一个控件，可以在一个方向上滚动内容，并在交叉滑动时开始拖动项目。 [英] How to build a control that can scroll content in one direction and start dragging items when cross-sliding.

问题描述

昨天我了解到我无法自定义GridView的拖动启动阈值，并且我需要实现自己的控件来控制交叉幻灯片重新排列阈值。   http://social.msdn.microsoft。 com /论坛/ zh-CN / winappswithcsharp / thread / 2eda3952-da71-4b15-aaee-9f865f680965

I learned yesterday that I can't customize the drag start threshold of a GridView and that I need to implement my own control to have control over the cross-slide rearrange threshold.  http://social.msdn.microsoft.com/Forums/en-US/winappswithcsharp/thread/2eda3952-da71-4b15-aaee-9f865f680965

所以我'一直试图这样做。  我从一些简单的事情开始：

So I've been trying to do that.  I started with something simple:

<ScrollViewer 
    VerticalScrollMode="Disabled"
    VerticalScrollBarVisibility="Hidden"
    HorizontalScrollMode="Enabled"
    HorizontalScrollBarVisibility="Auto"
    ZoomMode="Disabled" Height="150"
    VerticalAlignment="Bottom">

    <local:DragSource Height="150" VerticalAlignment="Bottom"/>

</ScrollViewer>

DragSource是一个用户用堆栈面板和一堆矩形控制。   DragSource处理PointerPressed，PointerMoved和PointerReleased并将它们传递给GestureRecognizer。  在PointerPressed上，DragSource捕获鼠标。  但是，
它会立即丢失鼠标捕获（大概是ScrollViewer）。  如果我将DragSource从ScrollViewer中取出，DragSource会保留鼠标捕获，并且手势识别器会按预期触发CrossSlide事件。

DragSource is a user control with a stack panel and a bunch of rectangles.  DragSource handles PointerPressed, PointerMoved and PointerReleased and passes them to a GestureRecognizer.  On PointerPressed, the DragSource captures the mouse.  However, it immediately loses mouse capture (presumably to the ScrollViewer).  If I take DragSource out of the ScrollViewer, DragSource retains the mouse capture, and the gesture recognizer fires the CrossSlide events as expected.

如何让ScrollViewer与CrossSliding子元素很好地配合？  这似乎应该很简单。  如果我向一个方向滑动，我想滚动，如果我向另一个方向滑动，我想开始拖动操作。

How do I get the ScrollViewer to play nicely with CrossSliding child elements?  This seems like it should be simple.  If I swipe in one direction, I want to scroll, if I swipe the other direction, I want to start a drag operation.

推荐答案

罗伯特 - 给我发电子邮件列表。  MSMALL在微软。

Robert - email me off-list.  MSMALL at Microsoft.

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