creating a draggable custom control [VC++]

creating a draggable custom control [VC++]

• SomeRandomName

  You are setting the left property. Just make sure that newX isn't smaller than zero or larger than "something" - panel1->Width. Where "something" is the container's width.
  
  
  

• GrahamY

  Check this thread. It uses VB.NET but it is all plain event handling and Windows Forms methods...
  
  
  

• TarPista

  Use the ClientSize.Width property.
  
  
  

• 87jerome

  Thanks again. Meanwhile I found the solution on my own, but there's still a problem. I make this check (newX + panel1->Width) <= (panel1->Parent->Width) and, if moved to the right, Panel1 goes beyond it's container of 2 pixels. I think they are the pixels corresponding to the sum of Panel1's and its container's borders.
  Know I only have to discover if all borderstyles have the same width and I'm done.
  Thanks again.
  
  

• Walter Beach

  Thank you for the reply. The code works in VC++ as well.
  Do you also know how to avoid that the control goes out of it's container
  I tried the following code (c++)
  
  private: System::Void panel1_MouseMove(System::Object^  sender, System::Windows::Forms::MouseEventArgs^  e) {
                   if(dragging)
                   {
                            Point pos = this->panel1->PointToScreen(e->Location);
                           int newX = panelPos.X+pos.X-mousePos.X;
                           if (((newX + panel1->Width) < panel1->Parent->Right)
                                   && (newX > panel1->Parent->Left))
                           {
                               this->panel1->Left=newX;
                           }
                   }
               }
  
  
  to replace the MouseMove event you suggested, but the Control doesn't stop where I want.
  Oddly, if I substitute 0 (which is the actual value) to panel1->Parent->Left, the code works.
  
  
• creating a draggable custom control [VC++]