CODEWITHSUNDEEP
c++visual-studiowxwidgets
taho
taho

Reputation: 67

Wxwidgets - How can I add resize event handler to make the "X" drawing to resize with the window?

I am trying to learn WxWidgets with C++ (I am very new at this), and I have created a window with a black background color and has a big red "X" on it. I have to edit the code so that the "X" changes its size with the window as I am resizing the window. How can I properly implement the resize event handler to this code?

Here's a screenshot of what my code produces: https://i.sstatic.net/d52yY.jpg

Here's what I have so far"

#include <wx/wx.h>
#include <wx/dcbuffer.h>

class MyCanvas : public wxWindow
{
public:
    MyCanvas(wxWindow* parent)
        : wxWindow(parent, wxID_ANY, wxDefaultPosition, wxDefaultSize, wxFULL_REPAINT_ON_RESIZE)

    {
        SetBackgroundStyle(wxBG_STYLE_PAINT);
        Bind(wxEVT_PAINT, &MyCanvas::OnPaint, this);
    }
private:
    void OnPaint(wxPaintEvent&)
    {
        wxAutoBufferedPaintDC dc(this);

        dc.SetPen(*wxRED_PEN);
        dc.SetBrush(*wxBLACK_BRUSH);

        dc.DrawLine(0,0,485,485);
        dc.DrawLine(0, 485, 485, 0);

    }
 };


class MyFrame : public wxFrame
{
public:
    MyFrame()
        : wxFrame(NULL, wxID_ANY, _("Resizable X"), wxDefaultPosition, wxSize(500, 525))
    {
        wxBoxSizer* bSizer = new wxBoxSizer(wxVERTICAL);

        bSizer->Add(new MyCanvas(this), 1, wxEXPAND);
        SetSizer(bSizer);
    }

};

/**** MyApp ****/
class MyApp : public wxApp
{
public:
    virtual bool OnInit()
   {
        MyFrame* frame = new MyFrame();
        frame->Show();

        return true;
    }
};


IMPLEMENT_APP(MyApp)

Upvotes: 0

Views: 1052

Answers (1)

VZ.
VZ.

Reputation: 22688

The simplest way to implement your resize handler is to do the following in MyCanvas ctor:

Bind(wxEVT_SIZE, [this](wxSizeEvent& event) { Refresh(); event.Skip(); });

This will fully refresh your canvas every time it is resized, i.e. will generate a wxEVT_PAINT that will result in a call to your existing OnPaint() handler.

Of course, for this to be actually useful, your OnPaint() should take the current window size into account, i.e. use GetClientSize() instead of hardcoded 485.

Upvotes: 2

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