CODEWITHSUNDEEP
c++wxwidgets
tzippy
tzippy

Reputation: 6638

Transparent wxPanel member in wxFrame

I have a MainFrame which is derived from wxFrame. The frame has a panel member m_panel of a custom class, derived from wxPanel.

I overloaded the OnPaint() function of the MainFrame to set a background image.

From the background image I only see a 5 pixel boarder. The rest is blocked by the wxPanel. And for some reason I cannot make the panel transparent. I tried m_panel->Hide() which had no effect at all and m_panel->SetBackgroundStyle(wxBG_STYLE_CUSTOM). The latter had the weird effect that I could see the desktop (however the background image was still visible in the 5px border).

I did add the wxTRANSPARENT_WINDOW style in the constructor of the wxPanel.

How can I have this panel and make it transparent?

Upvotes: 0

Views: 573

Answers (1)

Vikram Singh
Vikram Singh

Reputation: 1806

Have a custom wxPanel where you override OnPaint to have your drawings. Then use this as the main panel of your wxFrame. Example shown below:

class BackgroundPanel: public wxPanel
{
public:
    BackgroundPanel(wxFrame* parent);    
    void OnPaint(wxPaintEvent & evt);

private:
    wxBitmap    backgroundBitmap;

    DECLARE_EVENT_TABLE()
};


BackgroundPanel::BackgroundPanel(wxFrame* parent)
:wxPanel(parent)
{
    //Set backgroundBitmap
}


void BackgroundPanel::OnPaint(wxPaintEvent& evt)
{
    wxPaintDC dc(this);
    int height = GetClientRect().GetHeight() - backgroundBitmap.GetHeight();
    dc.DrawBitmap(backgroundBitmap,0,height,false);
}

Upvotes: 1

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