Enkel grafik i C#

#pragma once

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

    /// <summary>
    /// Summary for Form1
    ///
    /// WARNING: If you change the name of this class, you will need to change the
    ///          'Resource File Name' property for the managed resource compiler tool
    ///          associated with all .resx files this class depends on.  Otherwise,
    ///          the designers will not be able to interact properly with localized
    ///          resources associated with this form.
    /// </summary>
    public ref class Form1 : public System::Windows::Forms::Form
    {
    public:
        Form1(void)
        {
            InitializeComponent();
            this->pictureBox1->Image = gcnew Bitmap("c:\\test.bmp");
            this->pictureBox2->Image = gcnew Bitmap("c:\\test.bmp");
            this->currentBox = nullptr;
        }

    protected:
        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        ~Form1()
        {
            if (components) {
                delete components;
            }
        }

    private:
        System::Windows::Forms::PictureBox^ pictureBox1;
        System::Windows::Forms::PictureBox^ pictureBox2;
        System::Windows::Forms::PictureBox^ currentBox;
        Rectangle                            dragBoxFromMouseDown;

    private:
        /// <summary>
        /// Required designer variable.
        /// </summary>
        System::ComponentModel::Container ^components;

#pragma region Windows Form Designer generated code
        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        void InitializeComponent(void)
        {
            this->pictureBox1 = (gcnew System::Windows::Forms::PictureBox());
            this->pictureBox2 = (gcnew System::Windows::Forms::PictureBox());
            (cli::safe_cast<System::ComponentModel::ISupportInitialize^  >(this->pictureBox1))->BeginInit();
            (cli::safe_cast<System::ComponentModel::ISupportInitialize^  >(this->pictureBox2))->BeginInit();
            this->SuspendLayout();
            // 
            // pictureBox1
            // 
            this->pictureBox1->Location = System::Drawing::Point(420, 95);
            this->pictureBox1->Name = L"pictureBox1";
            this->pictureBox1->Size = System::Drawing::Size(200, 163);
            this->pictureBox1->TabIndex = 0;
            this->pictureBox1->TabStop = false;
            this->pictureBox1->MouseDown += gcnew System::Windows::Forms::MouseEventHandler(this, &Form1::PictureBox_MouseDown);
            this->pictureBox1->MouseMove += gcnew System::Windows::Forms::MouseEventHandler(this, &Form1::PictureBox_MouseMove);
            this->pictureBox1->MouseUp += gcnew System::Windows::Forms::MouseEventHandler(this, &Form1::PictureBox_MouseUp);
            // 
            // pictureBox2
            // 
            this->pictureBox2->Location = System::Drawing::Point(92, 116);
            this->pictureBox2->Name = L"pictureBox2";
            this->pictureBox2->Size = System::Drawing::Size(178, 121);
            this->pictureBox2->TabIndex = 1;
            this->pictureBox2->TabStop = false;
            this->pictureBox2->MouseDown += gcnew System::Windows::Forms::MouseEventHandler(this, &Form1::PictureBox_MouseDown);
            this->pictureBox2->MouseMove += gcnew System::Windows::Forms::MouseEventHandler(this, &Form1::PictureBox_MouseMove);
            this->pictureBox2->MouseUp += gcnew System::Windows::Forms::MouseEventHandler(this, &Form1::PictureBox_MouseUp);
            // 
            // Form1
            // 
            this->AllowDrop = true;
            this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
            this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
            this->ClientSize = System::Drawing::Size(657, 427);
            this->Controls->Add(this->pictureBox2);
            this->Controls->Add(this->pictureBox1);
            this->Name = L"Form1";
            this->Text = L"Form1";
            this->DragDrop += gcnew System::Windows::Forms::DragEventHandler(this, &Form1::Form1_DragDrop);
            this->DragOver += gcnew System::Windows::Forms::DragEventHandler(this, &Form1::Form1_DragOver);
            (cli::safe_cast<System::ComponentModel::ISupportInitialize^  >(this->pictureBox1))->EndInit();
            (cli::safe_cast<System::ComponentModel::ISupportInitialize^  >(this->pictureBox2))->EndInit();
            this->ResumeLayout(false);

        }
#pragma endregion
    
        System::Void PictureBox_MouseDown(System::Object^  sender, System::Windows::Forms::MouseEventArgs^  e)
        {
            try { 
                this->currentBox = safe_cast<PictureBox^>(sender);
            }
            catch (...) { return; }

            // Remember the point where the mouse down occurred. The DragSize indicates
            // the size that the mouse can move before a drag event should be started.
            System::Drawing::Size dragSize = SystemInformation::DragSize;
            
            // Create a rectangle using the DragSize, with the mouse position being
            // at the center of the rectangle.
            dragBoxFromMouseDown = Rectangle(Point(e->X - (dragSize.Width / 2),e->Y - (dragSize.Height / 2)),dragSize);
        }
    
        System::Void PictureBox_MouseMove(System::Object^  sender, System::Windows::Forms::MouseEventArgs^  e)
        {
            if ( (e->Button & System::Windows::Forms::MouseButtons::Left) == System::Windows::Forms::MouseButtons::Left ) {               
                // If the mouse moves outside the rectangle, start the drag.
                if (dragBoxFromMouseDown != Rectangle::Empty &&  !dragBoxFromMouseDown.Contains( e->X, e->Y ) )
                {                                  
                    // Proceed with the drag-and-drop, passing in the list item.
                    DragDropEffects dropEffect = this->DoDragDrop( this->pictureBox1, static_cast<DragDropEffects>(DragDropEffects::All | DragDropEffects::Link) );
                }
             }
        }
    
        System::Void PictureBox_MouseUp(System::Object^  sender, System::Windows::Forms::MouseEventArgs^  e)
        {
            // Reset the drag rectangle when the mouse button is raised.
            dragBoxFromMouseDown = Rectangle::Empty;
            this->currentBox = nullptr;
        }
    
        System::Void Form1_DragDrop(System::Object^ sender, System::Windows::Forms::DragEventArgs^  e)
        {
            if (this->currentBox) {
                this->currentBox->Location = Point(e->X - this->Location.X, e->Y - this->Location.Y);
            }
        }

        System::Void Form1_DragOver(System::Object^  sender, System::Windows::Forms::DragEventArgs^  e)
        {
             e->Effect = DragDropEffects::Move;
        }
    };
}