Make a borderless form movable

Question

Is there a way to make a form that has no border  FormBorderStyle is set to  none   movable when the mouse is clicked down on the form just as if there was a border

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Also if you need to DoubleClick and make your Form bigger smaller   you can use the First answer  create a global int variable  add 1 every time user clicks on the component you use for dragging  If variable    2 then make your form bigger smaller  Also use a timer for every half a sec or a second to make your variable   0

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Another simpler way to do the same thing   public partial class Form1   Form       public Form1                 InitializeComponent               set this FormBorderStyle to None here if needed            if set to none  make sure you have a way to close the form            protected override void WndProc ref Message m                base WndProc ref m           if  m Msg    WM NCHITTEST              m Result    IntPtr  HT CAPTION              private const int WM NCHITTEST   0x84      private const int HT CLIENT   0x1      private const int HT CAPTION   0x2

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Form1    new Moveable control1  control2  control3    Class   using System  using System Windows Forms   class Moveable       public const int WM NCLBUTTONDOWN   0xA1      public const int HT CAPTION   0x2       System Runtime InteropServices DllImportAttribute  user32 dll        public static extern int SendMessage IntPtr hWnd  int Msg  int wParam  int lParam        System Runtime InteropServices DllImportAttribute  user32 dll        public static extern bool ReleaseCapture        public Moveable params Control   controls                foreach  var ctrl in controls                        ctrl MouseDown     s  e    gt                                if  e Button    MouseButtons Left                                        ReleaseCapture                        SendMessage ctrl FindForm   Handle  WM NCLBUTTONDOWN  HT CAPTION  0                          Checks if Y   0  if so maximize the form                     if  ctrl FindForm   Location Y    0    ctrl FindForm   WindowState   FormWindowState Maximized

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There s no property you can flip to make this just happen magically  Look at the events for the form and it becomes fairly trivial to implement this by setting this Top and this Left  Specifically you ll want to look at MouseDown  MouseUp and MouseMove

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It worked for Me      private Point  mouseLoc       private void Form1 MouseDown object sender  MouseEventArgs e                 mouseLoc   e Location             private void Form1 MouseMove object sender  MouseEventArgs e                if  e Button    MouseButtons Left                        int dx   e Location X -  mouseLoc X              int dy   e Location Y -  mouseLoc Y              this Location   new Point this Location X   dx  this Location Y   dy

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Adding a MouseLeftButtonDown event handler to the MainWindow worked for me   In the event function that gets automatically generated  add the below code   base OnMouseLeftButtonDown e   this DragMove

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public Point mouseLocation  private void frmInstallDevice MouseDown object sender  MouseEventArgs e      mouseLocation   new Point -e X  -e Y      private void frmInstallDevice MouseMove object sender  MouseEventArgs e      if  e Button    MouseButtons Left          Point mousePos   Control MousePosition      mousePos Offset mouseLocation X  mouseLocation Y       Location   mousePos          this can solve ur problem

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Best way I ve found  modified of course      This adds the event handler for the control private void AddDrag Control Control    Control MouseDown    new System Windows Forms MouseEventHandler this DragForm MouseDown     public const int WM NCLBUTTONDOWN   0xA1  public const int HT CAPTION   0x2   System Runtime InteropServices DllImportAttribute  user32 dll    public static extern int SendMessage IntPtr hWnd  int Msg  int wParam  int lParam    System Runtime InteropServices DllImportAttribute  user32 dll    public static extern bool ReleaseCapture     private void DragForm MouseDown object sender  MouseEventArgs e        if  e Button    MouseButtons Left                ReleaseCapture            SendMessage Handle  WM NCLBUTTONDOWN  HT CAPTION  0              Checks if Y   0  if so maximize the form         if  this Location Y    0    this WindowState   FormWindowState Maximized              To apply drag to a control simply insert this after InitializeComponent    AddDrag NameOfControl

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This article on CodeProject details a technique  Is basically boils down to   public const int WM NCLBUTTONDOWN   0xA1  public const int HT CAPTION   0x2    System Runtime InteropServices DllImport  user32 dll    public static extern int SendMessage IntPtr hWnd  int Msg  int wParam  int lParam    System Runtime InteropServices DllImport  user32 dll    public static extern bool ReleaseCapture     private void Form1 MouseDown object sender  System Windows Forms MouseEventArgs e             if  e Button    MouseButtons Left                ReleaseCapture            SendMessage Handle  WM NCLBUTTONDOWN  HT CAPTION  0             This essentially does exactly the same as grabbing the title bar of a window  from the window manager s point of view

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https   social msdn microsoft com Forums vstudio en-US d803d869-68e6-46ff-9ff1-fabf78d6393c how-to-make-a-borderless-form-in-c forum csharpgeneral  This bit of code from the above link did the trick in my case     protected override void OnMouseDown MouseEventArgs e             base OnMouseDown e         if  e Button    MouseButtons Left                  this Capture   false          Message msg   Message Create this Handle  0XA1  new IntPtr 2   IntPtr Zero           this WndProc ref msg

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use MouseDown  MouseMove and MouseUp  You can set a variable flag for that  I have a sample  but I think you need to revise   I am coding the mouse action to a panel  Once you click the panel  your form will move with it     Global variables  private bool  dragging   false  private Point  offset  private Point  start point new Point 0 0     private void panel1 MouseDown object sender  MouseEventArgs e        dragging   true       dragging is your variable flag     start point   new Point e X  e Y      private void panel1 MouseUp object sender  MouseEventArgs e        dragging   false      private void panel1 MouseMove object sender  MouseEventArgs e      if  dragging           Point p   PointToScreen e Location        Location   new Point p X - this  start point X p Y - this  start point Y

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Ref  video Link  This is tested and easy to understand   protected override void WndProc ref Message m        switch  m Msg                case 0x84              base WndProc ref m               if  int m Result    0x1                  m Result    IntPtr 0x2              return             base WndProc ref m

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For  NET Framework 4    You can use this DragMove   for the MouseDown event of the component  mainLayout in this example  you are using to drag   private void mainLayout MouseDown object sender  MouseButtonEventArgs e        this DragMove

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Since some answers do not allow for child controls to be draggable  I ve created a little helper class  It should be passed the top level form  Can be made more generic if desired   class MouseDragger       private readonly Form  form      private Point  mouseDown       protected void OnMouseDown object sender  MouseEventArgs e                 mouseDown   e Location             protected void OnMouseMove object sender  MouseEventArgs e                if  e Button    MouseButtons Left                        int dx   e Location X -  mouseDown X              int dy   e Location Y -  mouseDown Y               form Location   new Point  form Location X   dx   form Location Y   dy                       public MouseDragger Form form                 form   form           MakeDraggable  form                          private void MakeDraggable Control control                var type   control GetType            if  typeof Button  IsAssignableFrom type                         return                     control MouseDown    OnMouseDown          control MouseMove    OnMouseMove           foreach  Control child in control Controls                        MakeDraggable child

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I was trying to make a borderless windows form movable which contained a WPF Element Host control and a WPF User control     I ended up with a stack panel called StackPanel in my WPF user control which seemed the logical thing to try click on to move  Trying junmats s code worked when I moved the mouse slowly  but if I moved the mouse faster  the mouse would move off the form and the form would be stuck somewhere mid move     This improved on his answer for my situation using CaptureMouse and ReleaseCaptureMouse and now the mouse does not move off the form while moving it even if I move it quickly   private void StackPanel MouseDown object sender  MouseButtonEventArgs e         start point   e GetPosition this       StackPanel CaptureMouse       private void StackPanel MouseUp object sender  MouseButtonEventArgs e        StackPanel ReleaseMouseCapture       private void StackPanel MouseMove object sender  MouseEventArgs e        if  StackPanel IsMouseCaptured                var p    form GetMousePositionWindowsForms             form Location   new System Drawing Point  int  p X - this  start point X    int  p Y - this  start point Y                   Global variables      private Point  start point   new Point 0  0

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I m expanding the solution from jay t55 with one more method ToolStrip1 MouseLeave that handles the event of the mouse moving quickly and leaving the region    private bool mouseDown  private Point lastLocation   private void ToolStrip1 MouseDown object sender  MouseEventArgs e        mouseDown   true      lastLocation   e Location     private void ToolStrip1 MouseMove object sender  MouseEventArgs e        if  mouseDown            this Location   new Point               this Location X - lastLocation X    e X   this Location Y - lastLocation Y    e Y            this Update             private void ToolStrip1 MouseUp object sender  MouseEventArgs e        mouseDown   false     private void ToolStrip1 MouseLeave object sender  EventArgs e        mouseDown   false

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I tried the following and presto changeo  my transparent window was no longer frozen in place but could be moved    throw away all those other complex solutions above         private void Window MouseLeftButtonDown object sender  MouseButtonEventArgs e                base OnMouseLeftButtonDown e              Begin dragging the window         this DragMove

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WPF only    don t have the exact code to hand  but in a recent project I think I used MouseDown event and simply put this   frmBorderless DragMove      Window DragMove Method  MSDN

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Let s not make things any more difficult than they need to be  I ve come across so many snippets of code that allow you to drag a form around  or another Control   And many of them have their own drawbacks side effects  Especially those ones where they trick Windows into thinking that a Control on a form is the actual form   That being said  here is my snippet  I use it all the time  I d also like to note that you should not use this Invalidate    as others like to do because it causes the form to flicker in some cases  And in some cases so does this Refresh  Using this Update  I have not had any flickering issues   private bool mouseDown  private Point lastLocation       private void Form1 MouseDown object sender  MouseEventArgs e                mouseDown   true          lastLocation   e Location             private void Form1 MouseMove object sender  MouseEventArgs e                if mouseDown                        this Location   new Point                   this Location X - lastLocation X    e X   this Location Y - lastLocation Y    e Y                this Update                         private void Form1 MouseUp object sender  MouseEventArgs e                mouseDown   false

User · Answer

Easiest way is   First create a label named label1  Go to label1 s events   mouse events   Label1 Mouse Move and write these   if  e Button    MouseButtons Left       Left    e X      Top    e Y

[c#] Make a borderless form movable?

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