DragAndDrop

Demonstrates drag&drop between two instances of application

main.cpp

#include "CtrlLib/CtrlLib.h"

using namespace Upp;

const char *MyDnDName = "MyReferenceDragAndDropExample";

struct MyApp : TopWindow {

    TreeCtrl   tree;

    typedef MyApp CLASSNAME;

    void DropInsert(int parent, int ii, PasteClip& d)

    {

        tree.AdjustAction(parent, d);

        if(d.Accept(MyDnDName)) {

            String s = ~d;

            s.Trim((int)strlen(~s)); // raw data can be padded with zeroes

            tree.SetCursor(tree.Insert(parent, ii, Image(), s));

            tree.SetFocus();

        }

    }

    void Drag()

    {

        if(!tree.IsCursor())

            return;

        int id = tree.GetCursor();

        String text = tree.Get();

        Size isz = GetTextSize(text.ToWString(), StdFont());

        ImageDraw iw(isz);

        iw.DrawRect(isz, White);

        iw.DrawText(0, 0, text);

        VectorMap<String, ClipData> clip;

        clip.Add(MyDnDName, text); // we are putting raw binary data here

        if(DoDragAndDrop(clip, iw) == DND_MOVE)

            tree.Remove(id);

    }

    MyApp() {

        Add(tree.SizePos());

        Vector<int> parent, parent2;

        parent.Add(0);

        tree.SetRoot(Image(), "The Tree");

        for(int i = 1; i < 10000; i++) {

            parent.Add(tree.Add(parent[rand() % parent.GetCount()], Image(),

                       FormatIntRoman(i, true)));

            if((rand() & 3) == 0)

                tree.Open(parent.Top());

        }

        tree.Open(0);

        tree.WhenDropInsert = THISFN(DropInsert);

        tree.WhenDrag = THISFN(Drag);

        Sizeable();

    }

};

GUI_APP_MAIN

{

    MyApp().Run();

}

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