我要评论前言
点击窗口任意区域可移动功能，在一些业务场景中会使用到，比如工具条或者球形状的窗口等。在wpf要实现此功能简单形式还是比较容易的，但是有一些细节需要专门处理，比如与按钮的点击事件冲突问题，解决事件冲突问题后拖动的灵敏度，可复用性等。
一、简单拖动
基础的拖动功能直接使用window类的dragmove即可实现：
在window的previewmouseleftbuttondown中调用dragmove即可。
示例如下：
<window previewmouseleftbuttondown="window_previewmouseleftbuttondown" />
void window_previewmouseleftbuttondown(object sender, system.windows.input.mousebuttoneventargs e)
{
dragmove();
}注：本文实现的是窗口任意区域拖动（比如按钮占满整个窗口），不适用于一般窗口拖动，一般窗口拖动请使用mouseleftbuttondown事件
二、事件冲突问题
根据上述方法实现窗口拖动后发现出现了事件冲突，即窗口内的控件无法相应鼠标点击事件了。因为dragmove的内部实现使用了sc_move，使标题栏（win32窗口）捕获鼠标，原本窗口失去鼠标捕获。窗口内的控件无法响应鼠标消息，因此上述简单拖动在有控件的窗口中是不可行的（局部拖动是可行的，但本文讲的是任意区域拖动）。
三、解决方法
解决方法是不在鼠标按下事件中触发拖动，而是在鼠标移动后触发拖动操作。具体步骤如下：
1、注册3个事件如下：
<window previewmouseleftbuttondown="window_previewmouseleftbuttondown"
previewmousemove="window_previewmousemove"
previewmouseleftbuttonup="window_previewmouseleftbuttonup"/>2、定义2个变量记录信息。
point _pressedposition ; bool _isdragmoved = false;
3.记录鼠标按下位置
void window_previewmouseleftbuttondown(object sender, system.windows.input.mousebuttoneventargs e)
{
_pressedposition = e.getposition(this);
}4.鼠标移动触发拖动
void window_previewmousemove(object sender, system.windows.input.mouseeventargs e)
{
if (mouse.leftbutton==mousebuttonstate.pressed && _pressedposition != e.getposition(this))
{
_isdragmoved = true;
dragmove();
}
}5.鼠标弹起屏蔽消息
void window_previewmouseleftbuttonup(object sender, mousebuttoneventargs e)
{
if (_isdragmoved)
{
_isdragmoved = false;
e.handled = true;
}
}四、效果预览
五、使用示例
由于评论区反馈上述方法存在bug，但是无奈笔者始终没有重现，怀疑是使用方法不正确，或者对本博文讲述功能理解上的差异导致的，在此根据上述方法初版原封不动的编写如下使用示例，以说明使用场景以及使用方法。
1、白板的工具条
（1）、mainwindow.xaml
<window x:class="wpfapp3.mainwindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:wpfapp3"
mc:ignorable="d"
background="transparent"
allowstransparency="true"
windowstyle="none"
title="mainwindow" height="60" width="410"
previewmouseleftbuttondown="window_previewmouseleftbuttondown"
previewmousemove="window_previewmousemove"
previewmouseleftbuttonup="window_previewmouseleftbuttonup">
<border background="white" cornerradius="25" margin="5">
<border.effect>
<dropshadoweffect shadowdepth="0" blurradius="5" opacity="0.8" color="#aaaaaa"/>
</border.effect>
<stackpanel margin="20,0,0,0" orientation="horizontal">
<radiobutton content="画笔" width="50" height="50" cursor="hand">
<radiobutton.template>
<controltemplate targettype="radiobutton" >
<border background="transparent">
<textblock x:name="txt" background="transparent" textalignment="center" horizontalalignment="center" verticalalignment="center" foreground="#666666" fontsize="18"
text="{templatebinding content}"></textblock>
</border>
<controltemplate.triggers>
<trigger property="ischecked" value="true">
<setter targetname="txt" property="foreground" value="red"></setter>
</trigger>
</controltemplate.triggers>
</controltemplate>
</radiobutton.template>
</radiobutton>
<radiobutton content="矩形" width="50" height="50" cursor="hand">
<radiobutton.template>
<controltemplate targettype="radiobutton" >
<border background="transparent">
<textblock x:name="txt" background="transparent" textalignment="center" horizontalalignment="center" verticalalignment="center" foreground="#666666" fontsize="18"
text="{templatebinding content}"></textblock>
</border>
<controltemplate.triggers>
<trigger property="ischecked" value="true">
<setter targetname="txt" property="foreground" value="red"></setter>
</trigger>
</controltemplate.triggers>
</controltemplate>
</radiobutton.template>
</radiobutton>
<radiobutton content="文本" width="50" height="50" cursor="hand">
<radiobutton.template>
<controltemplate targettype="radiobutton" >
<border background="transparent">
<textblock x:name="txt" background="transparent" textalignment="center" horizontalalignment="center" verticalalignment="center" foreground="#666666" fontsize="18"
text="{templatebinding content}"></textblock>
</border>
<controltemplate.triggers>
<trigger property="ischecked" value="true">
<setter targetname="txt" property="foreground" value="red"></setter>
</trigger>
</controltemplate.triggers>
</controltemplate>
</radiobutton.template>
</radiobutton>
<radiobutton content="箭头" width="50" height="50" cursor="hand">
<radiobutton.template>
<controltemplate targettype="radiobutton" >
<border background="transparent">
<textblock x:name="txt" background="transparent" textalignment="center" horizontalalignment="center" verticalalignment="center" foreground="#666666" fontsize="18"
text="{templatebinding content}"></textblock>
</border>
<controltemplate.triggers>
<trigger property="ischecked" value="true">
<setter targetname="txt" property="foreground" value="red"></setter>
</trigger>
</controltemplate.triggers>
</controltemplate>
</radiobutton.template>
</radiobutton>
<radiobutton content="图片" width="50" height="50" cursor="hand">
<radiobutton.template>
<controltemplate targettype="radiobutton" >
<border background="transparent">
<textblock x:name="txt" background="transparent" textalignment="center" horizontalalignment="center" verticalalignment="center" foreground="#666666" fontsize="18"
text="{templatebinding content}"></textblock>
</border>
<controltemplate.triggers>
<trigger property="ischecked" value="true">
<setter targetname="txt" property="foreground" value="red"></setter>
</trigger>
</controltemplate.triggers>
</controltemplate>
</radiobutton.template>
</radiobutton>
<border margin="10,0,0,0" borderthickness="1,0,0,0" borderbrush="#999999"></border>
<button name="btn_upload" margin="0,0,0,0" content="上传" width="50" height="50" cursor="hand" click="btn_upload_click">
<button.template>
<controltemplate targettype="button" >
<border background="transparent">
<textblock background="transparent" textalignment="center" horizontalalignment="center" verticalalignment="center" foreground="#666666" fontsize="18"
text="{templatebinding content}"></textblock>
</border>
</controltemplate>
</button.template>
</button>
<button name="btn_close" margin="0,0,0,0" content="关闭" width="50" height="50" cursor="hand" click="btn_close_click">
<button.template>
<controltemplate targettype="button" >
<border background="transparent">
<textblock background="transparent" textalignment="center" horizontalalignment="center" verticalalignment="center" foreground="#666666" fontsize="18"
text="{templatebinding content}"></textblock>
</border>
</controltemplate>
</button.template>
</button>
</stackpanel>
</border>
</window>（2）、mainwindow.xaml.cs
using system.windows;
using system.windows.input;
namespace wpfapp3
{
/// <summary>
/// mainwindow.xaml 的交互逻辑
/// </summary>
public partial class mainwindow : window
{
public mainwindow()
{
initializecomponent();
}
point _pressedposition;
bool _isdragmoved = false;
void window_previewmouseleftbuttondown(object sender, system.windows.input.mousebuttoneventargs e)
{
_pressedposition = e.getposition(this);
}
void window_previewmousemove(object sender, system.windows.input.mouseeventargs e)
{
if (mouse.leftbutton == mousebuttonstate.pressed && _pressedposition != e.getposition(this))
{
_isdragmoved = true;
dragmove();
}
}
void window_previewmouseleftbuttonup(object sender, mousebuttoneventargs e)
{
if (_isdragmoved)
{
_isdragmoved = false;
e.handled = true;
}
}
private void btn_upload_click(object sender, routedeventargs e)
{
messagebox.show("上传成功");
}
private void btn_close_click(object sender, routedeventargs e)
{
close();
}
}
}（3）、效果预览
总结
本文介绍了在窗口任意区域点击拖动的方法。简单的拖动是不可行的，往深一步探究，发现了巧妙的解决方法：在鼠标移动时触发拖动。但这也不是一蹴而就的，这是笔者曾经做项目经过了一定的探究最终得以实现，而本文呈现的是优化后的精简版本，易于实现也很好理解，即是所谓的大道至简。
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