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Re: Best way to implement a two-way LineEdit [message #14655 is a reply to message #14652]

Thu, 06 March 2008 10:53

mrjt
Messages: 705
Registered: March 2007
Location: London

Contributor

Setting the line color is easy enough, you just need a sub-class that overloads LineEdit::HighlightLine. I think you could even set the color (or change font!) for every character if necessary.

I'm not sure about a console-like LineEdit though. Personally I'd use a separate EditString for the text entry and keep the LineEdit as read-only.

This example colours alternate lines red/blue:

#include <CtrlLib/CtrlLib.h>
using namespace Upp;

class Console : public LineEdit {
    virtual void  HighlightLine(int line, Vector<Highlight>& h, int pos) {
        for (int i = 0; i < h.GetCount(); i++)
            h[i].ink = (line % 2) ? SBlue : SRed;
    }
};

class CtrlLibTest : public TopWindow {
    Console line;
    EditString cmd;

public:
    typedef CtrlLibTest CLASSNAME;
    CtrlLibTest()
    {
        SetRect(0, 0, 308, 344);
        CenterScreen();
       
        Add(line.NoCutLine().WantFocus(false).HSizePos().VSizePosZ(0, 23));
        Add(cmd.HSizePos().BottomPosZ(0, 24));
    }
   
    virtual bool Key(dword key, int count)
    {
        if (key == K_RETURN && cmd.HasFocus()) {
            if (line.GetLineCount() >= 199)
                line.Remove(0, line.GetLineLength(0)+1);
            line.Insert(line.GetLength(), (WString)~cmd + '\n');
            line.SetCursor(line.GetLength());
            cmd.Clear();
            return true;
        }
        return false;   
    }
};

GUI_APP_MAIN
{
    CtrlLibTest().Run();
}

but if you really want to intercept the return key in the LineEdit you just add a Key overload to Console and remember to call LineEdit::Key if key != K_RETURN.

Hope that helps.
James

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