blocks|key|1777831|text|Microsoft+KB+Article+320687对这个问题有一个详细的答案。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1777832|基本上，当要测试的点位于窗体的工作区时，您可以重写WndProc方法以将HTCAPTION返回到WM_NCHITTEST消息--这实际上是告诉Window将单击完全视为发生在窗体标题上的单击。|1777833|private+const+int+WM_NCHITTEST+=+0x84;
private+const+int+HTCLIENT+++++=+0x1;
private+const+int+HTCAPTION++++=+0x2;

protected+override+void+WndProc(ref+Message+m)
{
++++switch(m.Msg)
++++{
++++++++case+WM_NCHITTEST:
++++++++base.WndProc(ref+m);

++++++++if+((int)m.Result+==+HTCLIENT)
++++++++++++m.Result+=+(IntPtr)HTCAPTION;
++++++++return;
++++}

++++base.WndProc(ref+m);
}|code-block|syntax|javascript|1777834|entityMap|0|LINK|mutability|MUTABLE|url|http://support.microsoft.com/kb/320687^0|0|R|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|C|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

<a href="http://support.microsoft.com/kb/320687" rel="nofollow noreferrer" title="KB Article 320687">Microsoft KB Article 320687</a> has a detailed answer to this question.

Basically, you override the WndProc method to return HTCAPTION to the WM_NCHITTEST message when the point being tested is in the client area of the form -- which is, in effect, telling Windows to treat the click exactly the same as if it had occured on the caption of the form.

<pre><code>private const int WM_NCHITTEST = 0x84;
private const int HTCLIENT = 0x1;
private const int HTCAPTION = 0x2;

protected override void WndProc(ref Message m)
{
 switch(m.Msg)
 {
 case WM_NCHITTEST:
 base.WndProc(ref m);

 if ((int)m.Result == HTCLIENT)
 m.Result = (IntPtr)HTCAPTION;
 return;
 }

 base.WndProc(ref m);
}
</code></pre>

blocks|key|1777883|text|以下是使用P/Invoke完成此操作的一种方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1777884|public+const+int+WM_NCLBUTTONDOWN+=+0xA1;
public+const+int+HTCAPTION+=+0x2;
[DllImport("User32.dll")]
public+static+extern+bool+ReleaseCapture();
[DllImport("User32.dll")]
public+static+extern+int+SendMessage(IntPtr+hWnd,+int+Msg,+int+wParam,+int+lParam);

void+Form_Load(object+sender,+EventArgs+e)
{
+++this.MouseDown+%2B=+new+MouseEventHandler(Form_MouseDown);++
}

void+Form_MouseDown(object+sender,+MouseEventArgs+e)
{++++++++++++++++++++++++
++++if+(e.Button+==+MouseButtons.Left)
++++{
++++++++ReleaseCapture();
++++++++SendMessage(Handle,+WM_NCLBUTTONDOWN,+HTCAPTION,+0);
++++}
}|code-block|syntax|javascript|1777885|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Here is a way to do it using a P/Invoke.

<pre><code>public const int WM_NCLBUTTONDOWN = 0xA1;
public const int HTCAPTION = 0x2;
[DllImport("User32.dll")]
public static extern bool ReleaseCapture();
[DllImport("User32.dll")]
public static extern int SendMessage(IntPtr hWnd, int Msg, int wParam, int lParam);

void Form_Load(object sender, EventArgs e)
{
 this.MouseDown += new MouseEventHandler(Form_MouseDown); 
}

void Form_MouseDown(object sender, MouseEventArgs e)
{ 
 if (e.Button == MouseButtons.Left)
 {
 ReleaseCapture();
 SendMessage(Handle, WM_NCLBUTTONDOWN, HTCAPTION, 0);
 }
}
</code></pre>

blocks|key|1562778|text|公认的答案是一个很酷的技巧，但是如果窗体被一个填充停靠的子控件覆盖，例如Panel+(或派生的)，它并不总是有效，因为这个控件将吃掉所有的Windows消息。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1562779|这里有一个简单的方法，也适用于这种情况:派生有问题的控件(使用这个类而不是标准的)，并像这样处理鼠标消息：|1562780|++++private+class+MyTableLayoutPanel+:+Panel+//+or+TableLayoutPanel,+etc.
++++{
++++++++private+Point+_mouseDown;
++++++++private+Point+_formLocation;
++++++++private+bool+_capture;

++++++++//+NOTE:+we+cannot+use+the+WM_NCHITTEST+/+HTCAPTION+trick+because+the+table+is+in+control,+not+the+owning+form...
++++++++protected+override+void+OnMouseDown(MouseEventArgs+e)
++++++++{
++++++++++++_capture+=+true;
++++++++++++_mouseDown+=+e.Location;
++++++++++++_formLocation+=+((Form)TopLevelControl).Location;
++++++++}

++++++++protected+override+void+OnMouseUp(MouseEventArgs+e)
++++++++{
++++++++++++_capture+=+false;
++++++++}

++++++++protected+override+void+OnMouseMove(MouseEventArgs+e)
++++++++{
++++++++++++if+(_capture)
++++++++++++{
++++++++++++++++int+dx+=+e.Location.X+-+_mouseDown.X;
++++++++++++++++int+dy+=+e.Location.Y+-+_mouseDown.Y;
++++++++++++++++Point+newLocation+=+new+Point(_formLocation.X+%2B+dx,+_formLocation.Y+%2B+dy);
++++++++++++++++((Form)TopLevelControl).Location+=+newLocation;
++++++++++++++++_formLocation+=+newLocation;
++++++++++++}
++++++++}
++++}|code-block|syntax|javascript|1562781|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

The accepted answer is a cool trick, but it doesn't always work if the Form is covered by a Fill-docked child control like a Panel (or derivates) for example, because this control will eat all most Windows messages.

Here is a simple approach that works also in this case: derive the control in question (use this class instead of the standard one) an handle mouse messages like this:

<pre><code> private class MyTableLayoutPanel : Panel // or TableLayoutPanel, etc.
 {
 private Point _mouseDown;
 private Point _formLocation;
 private bool _capture;

 // NOTE: we cannot use the WM_NCHITTEST / HTCAPTION trick because the table is in control, not the owning form...
 protected override void OnMouseDown(MouseEventArgs e)
 {
 _capture = true;
 _mouseDown = e.Location;
 _formLocation = ((Form)TopLevelControl).Location;
 }

 protected override void OnMouseUp(MouseEventArgs e)
 {
 _capture = false;
 }

 protected override void OnMouseMove(MouseEventArgs e)
 {
 if (_capture)
 {
 int dx = e.Location.X - _mouseDown.X;
 int dy = e.Location.Y - _mouseDown.Y;
 Point newLocation = new Point(_formLocation.X + dx, _formLocation.Y + dy);
 ((Form)TopLevelControl).Location = newLocation;
 _formLocation = newLocation;
 }
 }
 }
</code></pre>

blocks|key|1778013|text|VC%2B%2B+2010版本(FlySwat的)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1778014|#include+<Windows.h>

namespace+DragWithoutTitleBar+{

++++using+namespace+System;
++++using+namespace+System::Windows::Forms;
++++using+namespace+System::ComponentModel;
++++using+namespace+System::Collections;
++++using+namespace+System::Data;
++++using+namespace+System::Drawing;

++++public+ref+class+Form1+:+public+System::Windows::Forms::Form
++++{
++++public:
++++++++Form1(void)+{+InitializeComponent();+}

++++protected:
++++++++~Form1()+{+if+(components)+{+delete+components;+}+}

++++private:
++++++++System::ComponentModel::Container+%5Ecomponents;
++++++++HWND+hWnd;

#pragma+region+Windows+Form+Designer+generated+code
++++++++void+InitializeComponent(void)
++++++++{
++++++++++++this->SuspendLayout();
++++++++++++this->AutoScaleDimensions+=+System::Drawing::SizeF(6,+13);
++++++++++++this->AutoScaleMode+=+System::Windows::Forms::AutoScaleMode::Font;
++++++++++++this->ClientSize+=+System::Drawing::Size(640,+480);
++++++++++++this->FormBorderStyle+=+System::Windows::Forms::FormBorderStyle::None;
++++++++++++this->Name+=+L"Form1";
++++++++++++this->Text+=+L"Form1";
++++++++++++this->Load+%2B=+gcnew+EventHandler(this,+&Form1::Form1_Load);
++++++++++++this->MouseDown+%2B=+gcnew+System::Windows::Forms::MouseEventHandler(this,+&Form1::Form1_MouseDown);
++++++++++++this->ResumeLayout(false);

++++++++}
#pragma+endregion
++++private:+System::Void+Form1_Load(Object%5E+sender,+EventArgs%5E++e)+{
++++++++++++++++++++hWnd+=+static_cast<HWND>(Handle.ToPointer());
++++++++++++++++}

++++private:+System::Void+Form1_MouseDown(Object%5E+sender,+System::Windows::Forms::MouseEventArgs%5E+e)+{
++++++++++++++++++++if+(e->Button+==+System::Windows::Forms::MouseButtons::Left)+{
++++++++++++++++++++++++::ReleaseCapture();
++++++++++++++++++++++++::SendMessage(hWnd,+/*WM_NCLBUTTONDOWN*/+0xA1,+/*HT_CAPTION*/+0x2,+0);
++++++++++++++++++++}
++++++++++++++++}

++++};
}|code-block|syntax|javascript|1778015|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

VC++ 2010 Version (of FlySwat's):

<pre><code>#include &lt;Windows.h&gt;

namespace DragWithoutTitleBar {

 using namespace System;
 using namespace System::Windows::Forms;
 using namespace System::ComponentModel;
 using namespace System::Collections;
 using namespace System::Data;
 using namespace System::Drawing;

 public ref class Form1 : public System::Windows::Forms::Form
 {
 public:
 Form1(void) { InitializeComponent(); }

 protected:
 ~Form1() { if (components) { delete components; } }

 private:
 System::ComponentModel::Container ^components;
 HWND hWnd;

#pragma region Windows Form Designer generated code
 void InitializeComponent(void)
 {
 this-&gt;SuspendLayout();
 this-&gt;AutoScaleDimensions = System::Drawing::SizeF(6, 13);
 this-&gt;AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
 this-&gt;ClientSize = System::Drawing::Size(640, 480);
 this-&gt;FormBorderStyle = System::Windows::Forms::FormBorderStyle::None;
 this-&gt;Name = L"Form1";
 this-&gt;Text = L"Form1";
 this-&gt;Load += gcnew EventHandler(this, &amp;Form1::Form1_Load);
 this-&gt;MouseDown += gcnew System::Windows::Forms::MouseEventHandler(this, &amp;Form1::Form1_MouseDown);
 this-&gt;ResumeLayout(false);

 }
#pragma endregion
 private: System::Void Form1_Load(Object^ sender, EventArgs^ e) {
 hWnd = static_cast&lt;HWND&gt;(Handle.ToPointer());
 }

 private: System::Void Form1_MouseDown(Object^ sender, System::Windows::Forms::MouseEventArgs^ e) {
 if (e-&gt;Button == System::Windows::Forms::MouseButtons::Left) {
 ::ReleaseCapture();
 ::SendMessage(hWnd, /*WM_NCLBUTTONDOWN*/ 0xA1, /*HT_CAPTION*/ 0x2, 0);
 }
 }

 };
}
</code></pre>

I am creating a small modal form that is used in Winforms application. It is basically a progress bar of sorts. But I would like the user to be able to click anywhere in the form and drag it to move it around on the desktop while it is still being displayed.

How can I implement this behavior?

Winforms - Click/drag anywhere in the form to move it as if clicked in the form caption

Windows

我正在创建一个小的模态表单，用于Winforms应用程序。它基本上是一种进度条。但我希望用户能够在窗体中的任何地方单击并拖动它，以便在桌面上移动它，同时它仍在显示。如何实现此行为？

问Winforms -在窗体中的任意位置单击/拖动以移动它，就像在窗体标题中单击一样
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